diff --git a/.gitignore b/.gitignore
index 97241f88..fe54b513 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ cabal.project.local~
 .HTF/
 .ghc.environment.*
 node_modules/
+.DS_Store
\ No newline at end of file
diff --git a/docs/_snowpack/link/repl/krill-parser.js b/docs/_snowpack/link/repl/krill-parser.js
new file mode 100644
index 00000000..db17b13f
--- /dev/null
+++ b/docs/_snowpack/link/repl/krill-parser.js
@@ -0,0 +1,1916 @@
+// Generated by Peggy 1.2.0.
+//
+// https://peggyjs.org/
+
+function peg$subclass(child, parent) {
+  function C() { this.constructor = child; }
+  C.prototype = parent.prototype;
+  child.prototype = new C();
+}
+
+function peg$SyntaxError(message, expected, found, location) {
+  var self = Error.call(this, message);
+  if (Object.setPrototypeOf) {
+    Object.setPrototypeOf(self, peg$SyntaxError.prototype);
+  }
+  self.expected = expected;
+  self.found = found;
+  self.location = location;
+  self.name = "SyntaxError";
+  return self;
+}
+
+peg$subclass(peg$SyntaxError, Error);
+
+function peg$padEnd(str, targetLength, padString) {
+  padString = padString || " ";
+  if (str.length > targetLength) { return str; }
+  targetLength -= str.length;
+  padString += padString.repeat(targetLength);
+  return str + padString.slice(0, targetLength);
+}
+
+peg$SyntaxError.prototype.format = function(sources) {
+  var str = "Error: " + this.message;
+  if (this.location) {
+    var src = null;
+    var k;
+    for (k = 0; k < sources.length; k++) {
+      if (sources[k].source === this.location.source) {
+        src = sources[k].text.split(/\r\n|\n|\r/g);
+        break;
+      }
+    }
+    var s = this.location.start;
+    var loc = this.location.source + ":" + s.line + ":" + s.column;
+    if (src) {
+      var e = this.location.end;
+      var filler = peg$padEnd("", s.line.toString().length);
+      var line = src[s.line - 1];
+      var last = s.line === e.line ? e.column : line.length + 1;
+      str += "\n --> " + loc + "\n"
+          + filler + " |\n"
+          + s.line + " | " + line + "\n"
+          + filler + " | " + peg$padEnd("", s.column - 1)
+          + peg$padEnd("", last - s.column, "^");
+    } else {
+      str += "\n at " + loc;
+    }
+  }
+  return str;
+};
+
+peg$SyntaxError.buildMessage = function(expected, found) {
+  var DESCRIBE_EXPECTATION_FNS = {
+    literal: function(expectation) {
+      return "\"" + literalEscape(expectation.text) + "\"";
+    },
+
+    class: function(expectation) {
+      var escapedParts = expectation.parts.map(function(part) {
+        return Array.isArray(part)
+          ? classEscape(part[0]) + "-" + classEscape(part[1])
+          : classEscape(part);
+      });
+
+      return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+    },
+
+    any: function() {
+      return "any character";
+    },
+
+    end: function() {
+      return "end of input";
+    },
+
+    other: function(expectation) {
+      return expectation.description;
+    }
+  };
+
+  function hex(ch) {
+    return ch.charCodeAt(0).toString(16).toUpperCase();
+  }
+
+  function literalEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/"/g,  "\\\"")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function classEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/\]/g, "\\]")
+      .replace(/\^/g, "\\^")
+      .replace(/-/g,  "\\-")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function describeExpectation(expectation) {
+    return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+  }
+
+  function describeExpected(expected) {
+    var descriptions = expected.map(describeExpectation);
+    var i, j;
+
+    descriptions.sort();
+
+    if (descriptions.length > 0) {
+      for (i = 1, j = 1; i < descriptions.length; i++) {
+        if (descriptions[i - 1] !== descriptions[i]) {
+          descriptions[j] = descriptions[i];
+          j++;
+        }
+      }
+      descriptions.length = j;
+    }
+
+    switch (descriptions.length) {
+      case 1:
+        return descriptions[0];
+
+      case 2:
+        return descriptions[0] + " or " + descriptions[1];
+
+      default:
+        return descriptions.slice(0, -1).join(", ")
+          + ", or "
+          + descriptions[descriptions.length - 1];
+    }
+  }
+
+  function describeFound(found) {
+    return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+  }
+
+  return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+};
+
+function peg$parse(input, options) {
+  options = options !== undefined ? options : {};
+
+  var peg$FAILED = {};
+  var peg$source = options.grammarSource;
+
+  var peg$startRuleFunctions = { start: peg$parsestart };
+  var peg$startRuleFunction = peg$parsestart;
+
+  var peg$c0 = ".";
+  var peg$c1 = "-";
+  var peg$c2 = "+";
+  var peg$c3 = "0";
+  var peg$c4 = ",";
+  var peg$c5 = "\"";
+  var peg$c6 = "'";
+  var peg$c7 = "#";
+  var peg$c8 = "[";
+  var peg$c9 = "]";
+  var peg$c10 = "<";
+  var peg$c11 = ">";
+  var peg$c12 = "@";
+  var peg$c13 = "(";
+  var peg$c14 = ")";
+  var peg$c15 = "/";
+  var peg$c16 = "*";
+  var peg$c17 = "%";
+  var peg$c18 = "struct";
+  var peg$c19 = "target";
+  var peg$c20 = "euclid";
+  var peg$c21 = "slow";
+  var peg$c22 = "rotL";
+  var peg$c23 = "rotR";
+  var peg$c24 = "fast";
+  var peg$c25 = "scale";
+  var peg$c26 = "//";
+  var peg$c27 = "cat";
+  var peg$c28 = "$";
+  var peg$c29 = "setcps";
+  var peg$c30 = "setbpm";
+  var peg$c31 = "hush";
+
+  var peg$r0 = /^[1-9]/;
+  var peg$r1 = /^[eE]/;
+  var peg$r2 = /^[0-9]/;
+  var peg$r3 = /^[ \n\r\t]/;
+  var peg$r4 = /^[0-9a-zA-Z~]/;
+  var peg$r5 = /^[^\n]/;
+
+  var peg$e0 = peg$otherExpectation("number");
+  var peg$e1 = peg$literalExpectation(".", false);
+  var peg$e2 = peg$classExpectation([["1", "9"]], false, false);
+  var peg$e3 = peg$classExpectation(["e", "E"], false, false);
+  var peg$e4 = peg$literalExpectation("-", false);
+  var peg$e5 = peg$literalExpectation("+", false);
+  var peg$e6 = peg$literalExpectation("0", false);
+  var peg$e7 = peg$classExpectation([["0", "9"]], false, false);
+  var peg$e8 = peg$otherExpectation("whitespace");
+  var peg$e9 = peg$classExpectation([" ", "\n", "\r", "\t"], false, false);
+  var peg$e10 = peg$literalExpectation(",", false);
+  var peg$e11 = peg$literalExpectation("\"", false);
+  var peg$e12 = peg$literalExpectation("'", false);
+  var peg$e13 = peg$classExpectation([["0", "9"], ["a", "z"], ["A", "Z"], "~"], false, false);
+  var peg$e14 = peg$literalExpectation("#", false);
+  var peg$e15 = peg$literalExpectation("[", false);
+  var peg$e16 = peg$literalExpectation("]", false);
+  var peg$e17 = peg$literalExpectation("<", false);
+  var peg$e18 = peg$literalExpectation(">", false);
+  var peg$e19 = peg$literalExpectation("@", false);
+  var peg$e20 = peg$literalExpectation("(", false);
+  var peg$e21 = peg$literalExpectation(")", false);
+  var peg$e22 = peg$literalExpectation("/", false);
+  var peg$e23 = peg$literalExpectation("*", false);
+  var peg$e24 = peg$literalExpectation("%", false);
+  var peg$e25 = peg$literalExpectation("struct", false);
+  var peg$e26 = peg$literalExpectation("target", false);
+  var peg$e27 = peg$literalExpectation("euclid", false);
+  var peg$e28 = peg$literalExpectation("slow", false);
+  var peg$e29 = peg$literalExpectation("rotL", false);
+  var peg$e30 = peg$literalExpectation("rotR", false);
+  var peg$e31 = peg$literalExpectation("fast", false);
+  var peg$e32 = peg$literalExpectation("scale", false);
+  var peg$e33 = peg$literalExpectation("//", false);
+  var peg$e34 = peg$classExpectation(["\n"], true, false);
+  var peg$e35 = peg$literalExpectation("cat", false);
+  var peg$e36 = peg$literalExpectation("$", false);
+  var peg$e37 = peg$literalExpectation("setcps", false);
+  var peg$e38 = peg$literalExpectation("setbpm", false);
+  var peg$e39 = peg$literalExpectation("hush", false);
+
+  var peg$f0 = function() { return parseFloat(text()); };
+  var peg$f1 = function(chars) { return chars.join("") };
+  var peg$f2 = function(s) { return s};
+  var peg$f3 = function(sc) { sc.arguments_.alignment = "t"; return sc;};
+  var peg$f4 = function(a) { return { weight: a} };
+  var peg$f5 = function(p, s) { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s } } } };
+  var peg$f6 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:a } } } };
+  var peg$f7 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:"1/"+a } } } };
+  var peg$f8 = function(a) { return { operator : { type_: "fixed-step", arguments_ :{ amount:a } } } };
+  var peg$f9 = function(s, o) { return new ElementStub(s, o);};
+  var peg$f10 = function(s) { return new PatternStub(s,"h"); };
+  var peg$f11 = function(c, v) { return v};
+  var peg$f12 = function(c, cs) { if (cs.length == 0 && c instanceof Object) { return c;} else { cs.unshift(c); return new PatternStub(cs,"v");}  };
+  var peg$f13 = function(s) { return s; };
+  var peg$f14 = function(s) { return { name: "struct", args: { sequence:s }}};
+  var peg$f15 = function(s) { return { name: "target", args : { name:s}}};
+  var peg$f16 = function(p, s) { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}};
+  var peg$f17 = function(a) { return { name: "stretch", args :{ amount: a}}};
+  var peg$f18 = function(a) { return { name: "shift", args :{ amount: "-"+a}}};
+  var peg$f19 = function(a) { return { name: "shift", args :{ amount: a}}};
+  var peg$f20 = function(a) { return { name: "stretch", args :{ amount: "1/"+a}}};
+  var peg$f21 = function(s) { return { name: "scale", args :{ scale: s.join("")}}};
+  var peg$f22 = function(s, v) { return v};
+  var peg$f23 = function(s, ss) { ss.unshift(s); return new PatternStub(ss,"t"); };
+  var peg$f24 = function(sg) {return sg};
+  var peg$f25 = function(o, soc) { return new OperatorStub(o.name,o.args,soc)};
+  var peg$f26 = function(sc) { return sc };
+  var peg$f27 = function(c) { return c };
+  var peg$f28 = function(v) { return new CommandStub("setcps", { value: v})};
+  var peg$f29 = function(v) { return new CommandStub("setcps", { value: (v/120/2)})};
+  var peg$f30 = function() { return new CommandStub("hush")};
+
+  var peg$currPos = 0;
+  var peg$savedPos = 0;
+  var peg$posDetailsCache = [{ line: 1, column: 1 }];
+  var peg$maxFailPos = 0;
+  var peg$maxFailExpected = [];
+  var peg$silentFails = 0;
+
+  var peg$result;
+
+  if ("startRule" in options) {
+    if (!(options.startRule in peg$startRuleFunctions)) {
+      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+    }
+
+    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+  }
+
+  function text() {
+    return input.substring(peg$savedPos, peg$currPos);
+  }
+
+  function offset() {
+    return peg$savedPos;
+  }
+
+  function range() {
+    return {
+      source: peg$source,
+      start: peg$savedPos,
+      end: peg$currPos
+    };
+  }
+
+  function location() {
+    return peg$computeLocation(peg$savedPos, peg$currPos);
+  }
+
+  function expected(description, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildStructuredError(
+      [peg$otherExpectation(description)],
+      input.substring(peg$savedPos, peg$currPos),
+      location
+    );
+  }
+
+  function error(message, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildSimpleError(message, location);
+  }
+
+  function peg$literalExpectation(text, ignoreCase) {
+    return { type: "literal", text: text, ignoreCase: ignoreCase };
+  }
+
+  function peg$classExpectation(parts, inverted, ignoreCase) {
+    return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+  }
+
+  function peg$anyExpectation() {
+    return { type: "any" };
+  }
+
+  function peg$endExpectation() {
+    return { type: "end" };
+  }
+
+  function peg$otherExpectation(description) {
+    return { type: "other", description: description };
+  }
+
+  function peg$computePosDetails(pos) {
+    var details = peg$posDetailsCache[pos];
+    var p;
+
+    if (details) {
+      return details;
+    } else {
+      p = pos - 1;
+      while (!peg$posDetailsCache[p]) {
+        p--;
+      }
+
+      details = peg$posDetailsCache[p];
+      details = {
+        line: details.line,
+        column: details.column
+      };
+
+      while (p < pos) {
+        if (input.charCodeAt(p) === 10) {
+          details.line++;
+          details.column = 1;
+        } else {
+          details.column++;
+        }
+
+        p++;
+      }
+
+      peg$posDetailsCache[pos] = details;
+
+      return details;
+    }
+  }
+
+  function peg$computeLocation(startPos, endPos) {
+    var startPosDetails = peg$computePosDetails(startPos);
+    var endPosDetails = peg$computePosDetails(endPos);
+
+    return {
+      source: peg$source,
+      start: {
+        offset: startPos,
+        line: startPosDetails.line,
+        column: startPosDetails.column
+      },
+      end: {
+        offset: endPos,
+        line: endPosDetails.line,
+        column: endPosDetails.column
+      }
+    };
+  }
+
+  function peg$fail(expected) {
+    if (peg$currPos < peg$maxFailPos) { return; }
+
+    if (peg$currPos > peg$maxFailPos) {
+      peg$maxFailPos = peg$currPos;
+      peg$maxFailExpected = [];
+    }
+
+    peg$maxFailExpected.push(expected);
+  }
+
+  function peg$buildSimpleError(message, location) {
+    return new peg$SyntaxError(message, null, null, location);
+  }
+
+  function peg$buildStructuredError(expected, found, location) {
+    return new peg$SyntaxError(
+      peg$SyntaxError.buildMessage(expected, found),
+      expected,
+      found,
+      location
+    );
+  }
+
+  function peg$parsestart() {
+    var s0;
+
+    s0 = peg$parsestatement();
+
+    return s0;
+  }
+
+  function peg$parsenumber() {
+    var s0, s1, s2, s3, s4;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parseminus();
+    if (s1 === peg$FAILED) {
+      s1 = null;
+    }
+    s2 = peg$parseint();
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsefrac();
+      if (s3 === peg$FAILED) {
+        s3 = null;
+      }
+      s4 = peg$parseexp();
+      if (s4 === peg$FAILED) {
+        s4 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f0();
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsedecimal_point() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 46) {
+      s0 = peg$c0;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e1); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsedigit1_9() {
+    var s0;
+
+    if (peg$r0.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e2); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsee() {
+    var s0;
+
+    if (peg$r1.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseexp() {
+    var s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parsee();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseminus();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parseplus();
+      }
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      s3 = [];
+      s4 = peg$parseDIGIT();
+      if (s4 !== peg$FAILED) {
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parseDIGIT();
+        }
+      } else {
+        s3 = peg$FAILED;
+      }
+      if (s3 !== peg$FAILED) {
+        s1 = [s1, s2, s3];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsefrac() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsedecimal_point();
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$parseDIGIT();
+      if (s3 !== peg$FAILED) {
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parseDIGIT();
+        }
+      } else {
+        s2 = peg$FAILED;
+      }
+      if (s2 !== peg$FAILED) {
+        s1 = [s1, s2];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseint() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$parsezero();
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parsedigit1_9();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parseDIGIT();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parseDIGIT();
+        }
+        s1 = [s1, s2];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseminus() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 45) {
+      s0 = peg$c1;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e4); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseplus() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 43) {
+      s0 = peg$c2;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e5); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsezero() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 48) {
+      s0 = peg$c3;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e6); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseDIGIT() {
+    var s0;
+
+    if (peg$r2.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e7); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsews() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = [];
+    if (peg$r3.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e9); }
+    }
+    while (s1 !== peg$FAILED) {
+      s0.push(s1);
+      if (peg$r3.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e9); }
+      }
+    }
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e8); }
+
+    return s0;
+  }
+
+  function peg$parsecomma() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 44) {
+      s2 = peg$c4;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s1 = [s1, s2, s3];
+      s0 = s1;
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsequote() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 34) {
+      s0 = peg$c5;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e11); }
+    }
+    if (s0 === peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 39) {
+        s0 = peg$c6;
+        peg$currPos++;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e12); }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestep_char() {
+    var s0;
+
+    if (peg$r4.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
+    }
+    if (s0 === peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 45) {
+        s0 = peg$c1;
+        peg$currPos++;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e4); }
+      }
+      if (s0 === peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 35) {
+          s0 = peg$c7;
+          peg$currPos++;
+        } else {
+          s0 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e14); }
+        }
+        if (s0 === peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s0 = peg$c0;
+            peg$currPos++;
+          } else {
+            s0 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e1); }
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestep() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = [];
+    s3 = peg$parsestep_char();
+    if (s3 !== peg$FAILED) {
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$parsestep_char();
+      }
+    } else {
+      s2 = peg$FAILED;
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      peg$savedPos = s0;
+      s0 = peg$f1(s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesub_cycle() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 91) {
+      s2 = peg$c8;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e15); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s4 = peg$parsestack();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 93) {
+          s6 = peg$c9;
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e16); }
+        }
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parsews();
+          peg$savedPos = s0;
+          s0 = peg$f2(s4);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsetimeline() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 60) {
+      s2 = peg$c10;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e17); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s4 = peg$parsesingle_cycle();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 62) {
+          s6 = peg$c11;
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e18); }
+        }
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parsews();
+          peg$savedPos = s0;
+          s0 = peg$f3(s4);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice() {
+    var s0;
+
+    s0 = peg$parsestep();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsesub_cycle();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsetimeline();
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_modifier() {
+    var s0;
+
+    s0 = peg$parseslice_weight();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parseslice_bjorklund();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseslice_slow();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parseslice_fast();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseslice_fixed_step();
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_weight() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 64) {
+      s1 = peg$c12;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e19); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f4(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_bjorklund() {
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 40) {
+      s1 = peg$c13;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e20); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parsecomma();
+        if (s5 !== peg$FAILED) {
+          s6 = peg$parsews();
+          s7 = peg$parsenumber();
+          if (s7 !== peg$FAILED) {
+            s8 = peg$parsews();
+            if (input.charCodeAt(peg$currPos) === 41) {
+              s9 = peg$c14;
+              peg$currPos++;
+            } else {
+              s9 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$e21); }
+            }
+            if (s9 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s0 = peg$f5(s3, s7);
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_slow() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 47) {
+      s1 = peg$c15;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e22); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f6(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_fast() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 42) {
+      s1 = peg$c16;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e23); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f7(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_fixed_step() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 37) {
+      s1 = peg$c17;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e24); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f8(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_with_modifier() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    s1 = peg$parseslice();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseslice_modifier();
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f9(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesingle_cycle() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parseslice_with_modifier();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parseslice_with_modifier();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f10(s1);
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsestack() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesingle_cycle();
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$currPos;
+      s4 = peg$parsecomma();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsesingle_cycle();
+        if (s5 !== peg$FAILED) {
+          peg$savedPos = s3;
+          s3 = peg$f11(s1, s5);
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s3;
+        s3 = peg$FAILED;
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$currPos;
+        s4 = peg$parsecomma();
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsesingle_cycle();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s3;
+            s3 = peg$f11(s1, s5);
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+      }
+      peg$savedPos = s0;
+      s0 = peg$f12(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence() {
+    var s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = peg$parsequote();
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsestack();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsequote();
+        if (s4 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f13(s3);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseoperator() {
+    var s0;
+
+    s0 = peg$parsescale();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parseslow();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsefast();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parsetarget();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parsebjorklund();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsestruct();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parserotR();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parserotL();
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestruct() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c18) {
+      s1 = peg$c18;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e25); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsesequence_or_operator();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f14(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsetarget() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c19) {
+      s1 = peg$c19;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e26); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsequote();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsestep();
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsequote();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f15(s4);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsebjorklund() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c20) {
+      s1 = peg$c20;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e27); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parseint();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parseint();
+        if (s5 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f16(s3, s5);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslow() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c21) {
+      s1 = peg$c21;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e28); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f17(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parserotL() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c22) {
+      s1 = peg$c22;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e29); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f18(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parserotR() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c23) {
+      s1 = peg$c23;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e30); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f19(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsefast() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c24) {
+      s1 = peg$c24;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e31); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f20(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsescale() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 5) === peg$c25) {
+      s1 = peg$c25;
+      peg$currPos += 5;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e32); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsequote();
+      if (s3 !== peg$FAILED) {
+        s4 = [];
+        s5 = peg$parsestep_char();
+        if (s5 !== peg$FAILED) {
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parsestep_char();
+          }
+        } else {
+          s4 = peg$FAILED;
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsequote();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f21(s4);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsecomment() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 2) === peg$c26) {
+      s1 = peg$c26;
+      peg$currPos += 2;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e33); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      if (peg$r5.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e34); }
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        if (peg$r5.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e34); }
+        }
+      }
+      s1 = [s1, s2];
+      s0 = s1;
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsecat() {
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 3) === peg$c27) {
+      s1 = peg$c27;
+      peg$currPos += 3;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e35); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s3 = peg$c8;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e15); }
+      }
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parsesequence_or_operator();
+        if (s5 !== peg$FAILED) {
+          s6 = [];
+          s7 = peg$currPos;
+          s8 = peg$parsecomma();
+          if (s8 !== peg$FAILED) {
+            s9 = peg$parsesequence_or_operator();
+            if (s9 !== peg$FAILED) {
+              peg$savedPos = s7;
+              s7 = peg$f22(s5, s9);
+            } else {
+              peg$currPos = s7;
+              s7 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s7;
+            s7 = peg$FAILED;
+          }
+          while (s7 !== peg$FAILED) {
+            s6.push(s7);
+            s7 = peg$currPos;
+            s8 = peg$parsecomma();
+            if (s8 !== peg$FAILED) {
+              s9 = peg$parsesequence_or_operator();
+              if (s9 !== peg$FAILED) {
+                peg$savedPos = s7;
+                s7 = peg$f22(s5, s9);
+              } else {
+                peg$currPos = s7;
+                s7 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s7;
+              s7 = peg$FAILED;
+            }
+          }
+          s7 = peg$parsews();
+          if (input.charCodeAt(peg$currPos) === 93) {
+            s8 = peg$c9;
+            peg$currPos++;
+          } else {
+            s8 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e16); }
+          }
+          if (s8 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f23(s5, s6);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_or_group() {
+    var s0;
+
+    s0 = peg$parsecat();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsesequence();
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_or_operator() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesequence_or_group();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = [];
+      s4 = peg$parsecomment();
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        s4 = peg$parsecomment();
+      }
+      peg$savedPos = s0;
+      s0 = peg$f24(s1);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parseoperator();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 36) {
+          s3 = peg$c28;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e36); }
+        }
+        if (s3 !== peg$FAILED) {
+          s4 = peg$parsews();
+          s5 = peg$parsesequence_or_operator();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f25(s1, s5);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequ_or_operator_or_comment() {
+    var s0, s1;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesequence_or_operator();
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f26(s1);
+    }
+    s0 = s1;
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsecomment();
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_definition() {
+    var s0;
+
+    s0 = peg$parsesequ_or_operator_or_comment();
+
+    return s0;
+  }
+
+  function peg$parsecommand() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = peg$parsesetcps();
+    if (s2 === peg$FAILED) {
+      s2 = peg$parsesetbpm();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parsehush();
+      }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      peg$savedPos = s0;
+      s0 = peg$f27(s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesetcps() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c29) {
+      s1 = peg$c29;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e37); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f28(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesetbpm() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c30) {
+      s1 = peg$c30;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e38); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f29(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsehush() {
+    var s0, s1;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c31) {
+      s1 = peg$c31;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e39); }
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f30();
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsestatement() {
+    var s0;
+
+    s0 = peg$parsesequence_definition();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsecommand();
+    }
+
+    return s0;
+  }
+
+
+    var PatternStub = function(source, alignment)
+    {
+      this.type_ = "pattern";
+      this.arguments_ = { alignment : alignment};
+      this.source_ = source;
+    }
+
+    var OperatorStub = function(name, args, source)
+    {
+      this.type_ = name;
+      this.arguments_ = args;
+      this.source_ = source;
+    }
+
+    var ElementStub = function(source, options)
+    {
+      this.type_ = "element";
+      this.source_ = source;
+      this.options_ = options;
+    }
+
+    var CommandStub = function(name, options)
+    {
+      this.type_ = "command";
+      this.name_ = name;
+      this.options_ = options;
+    }
+
+
+
+  peg$result = peg$startRuleFunction();
+
+  if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+    return peg$result;
+  } else {
+    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+      peg$fail(peg$endExpectation());
+    }
+
+    throw peg$buildStructuredError(
+      peg$maxFailExpected,
+      peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+      peg$maxFailPos < input.length
+        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+    );
+  }
+}
+
+export {
+  peg$SyntaxError as SyntaxError,
+  peg$parse as parse
+};
diff --git a/docs/_snowpack/link/strudel.js b/docs/_snowpack/link/strudel.js
index 3934b8e4..62c75709 100644
--- a/docs/_snowpack/link/strudel.js
+++ b/docs/_snowpack/link/strudel.js
@@ -292,20 +292,40 @@ class Pattern {
   outerJoin() {
     return this.outerBind(id);
   }
+  _patternify(func) {
+    const pat = this;
+    const patterned = function(...args) {
+      const pat_arg = sequence(...args);
+      return pat_arg.fmap((arg) => func.call(pat, arg)).outerJoin();
+    };
+    return patterned;
+  }
   _fast(factor) {
     var fastQuery = this.withQueryTime((t) => t.mul(factor));
     return fastQuery.withEventTime((t) => t.div(factor));
   }
+  fast(factor) {
+    return this._patternify(Pattern.prototype._fast)(factor);
+  }
   _slow(factor) {
     return this._fast(1 / factor);
   }
+  slow(factor) {
+    return this._patternify(Pattern.prototype._slow)(factor);
+  }
   _early(offset) {
     offset = Fraction(offset);
     return this.withQueryTime((t) => t.add(offset)).withEventTime((t) => t.sub(offset));
   }
+  early(factor) {
+    return this._patternify(Pattern.prototype._early)(factor);
+  }
   _late(offset) {
     return this._early(0 - offset);
   }
+  late(factor) {
+    return this._patternify(Pattern.prototype._late)(factor);
+  }
   when(binary_pat, func) {
     var true_pat = binary_pat._filterValues(id);
     var false_pat = binary_pat._filterValues((val) => !val);
@@ -379,9 +399,11 @@ function stack(...pats) {
 }
 function slowcat(...pats) {
   pats = pats.map(reify);
-  var query2 = function(span) {
-    var pat = pats[Math.floor(span.begin) % pats.length];
-    return pat.query(span);
+  const query2 = function(span) {
+    const pat_n = Math.floor(span.begin) % pats.length;
+    const pat = pats[pat_n];
+    const offset = span.begin.floor().sub(span.begin.div(pats.length).floor());
+    return pat.withEventTime((t) => t.add(offset)).query(span.withTime((t) => t.sub(offset)));
   };
   return new Pattern(query2)._splitQueries();
 }
diff --git a/docs/_snowpack/pkg/@tonaljs/tonal.js b/docs/_snowpack/pkg/@tonaljs/tonal.js
new file mode 100644
index 00000000..c8186d9b
--- /dev/null
+++ b/docs/_snowpack/pkg/@tonaljs/tonal.js
@@ -0,0 +1,1722 @@
+/**
+ * Fill a string with a repeated character
+ *
+ * @param character
+ * @param repetition
+ */
+const fillStr = (s, n) => Array(Math.abs(n) + 1).join(s);
+function deprecate(original, alternative, fn) {
+    return function (...args) {
+        // tslint:disable-next-line
+        console.warn(`${original} is deprecated. Use ${alternative}.`);
+        return fn.apply(this, args);
+    };
+}
+
+function isNamed(src) {
+    return src !== null && typeof src === "object" && typeof src.name === "string"
+        ? true
+        : false;
+}
+
+function isPitch(pitch) {
+    return pitch !== null &&
+        typeof pitch === "object" &&
+        typeof pitch.step === "number" &&
+        typeof pitch.alt === "number"
+        ? true
+        : false;
+}
+// The number of fifths of [C, D, E, F, G, A, B]
+const FIFTHS = [0, 2, 4, -1, 1, 3, 5];
+// The number of octaves it span each step
+const STEPS_TO_OCTS = FIFTHS.map((fifths) => Math.floor((fifths * 7) / 12));
+function encode(pitch) {
+    const { step, alt, oct, dir = 1 } = pitch;
+    const f = FIFTHS[step] + 7 * alt;
+    if (oct === undefined) {
+        return [dir * f];
+    }
+    const o = oct - STEPS_TO_OCTS[step] - 4 * alt;
+    return [dir * f, dir * o];
+}
+// We need to get the steps from fifths
+// Fifths for CDEFGAB are [ 0, 2, 4, -1, 1, 3, 5 ]
+// We add 1 to fifths to avoid negative numbers, so:
+// for ["F", "C", "G", "D", "A", "E", "B"] we have:
+const FIFTHS_TO_STEPS = [3, 0, 4, 1, 5, 2, 6];
+function decode(coord) {
+    const [f, o, dir] = coord;
+    const step = FIFTHS_TO_STEPS[unaltered(f)];
+    const alt = Math.floor((f + 1) / 7);
+    if (o === undefined) {
+        return { step, alt, dir };
+    }
+    const oct = o + 4 * alt + STEPS_TO_OCTS[step];
+    return { step, alt, oct, dir };
+}
+// Return the number of fifths as if it were unaltered
+function unaltered(f) {
+    const i = (f + 1) % 7;
+    return i < 0 ? 7 + i : i;
+}
+
+const NoNote = { empty: true, name: "", pc: "", acc: "" };
+const cache$1 = new Map();
+const stepToLetter = (step) => "CDEFGAB".charAt(step);
+const altToAcc = (alt) => alt < 0 ? fillStr("b", -alt) : fillStr("#", alt);
+const accToAlt = (acc) => acc[0] === "b" ? -acc.length : acc.length;
+/**
+ * Given a note literal (a note name or a note object), returns the Note object
+ * @example
+ * note('Bb4') // => { name: "Bb4", midi: 70, chroma: 10, ... }
+ */
+function note(src) {
+    const cached = cache$1.get(src);
+    if (cached) {
+        return cached;
+    }
+    const value = typeof src === "string"
+        ? parse$1(src)
+        : isPitch(src)
+            ? note(pitchName$1(src))
+            : isNamed(src)
+                ? note(src.name)
+                : NoNote;
+    cache$1.set(src, value);
+    return value;
+}
+const REGEX$1 = /^([a-gA-G]?)(#{1,}|b{1,}|x{1,}|)(-?\d*)\s*(.*)$/;
+/**
+ * @private
+ */
+function tokenizeNote(str) {
+    const m = REGEX$1.exec(str);
+    return [m[1].toUpperCase(), m[2].replace(/x/g, "##"), m[3], m[4]];
+}
+/**
+ * @private
+ */
+function coordToNote(noteCoord) {
+    return note(decode(noteCoord));
+}
+const mod = (n, m) => ((n % m) + m) % m;
+const SEMI = [0, 2, 4, 5, 7, 9, 11];
+function parse$1(noteName) {
+    const tokens = tokenizeNote(noteName);
+    if (tokens[0] === "" || tokens[3] !== "") {
+        return NoNote;
+    }
+    const letter = tokens[0];
+    const acc = tokens[1];
+    const octStr = tokens[2];
+    const step = (letter.charCodeAt(0) + 3) % 7;
+    const alt = accToAlt(acc);
+    const oct = octStr.length ? +octStr : undefined;
+    const coord = encode({ step, alt, oct });
+    const name = letter + acc + octStr;
+    const pc = letter + acc;
+    const chroma = (SEMI[step] + alt + 120) % 12;
+    const height = oct === undefined
+        ? mod(SEMI[step] + alt, 12) - 12 * 99
+        : SEMI[step] + alt + 12 * (oct + 1);
+    const midi = height >= 0 && height <= 127 ? height : null;
+    const freq = oct === undefined ? null : Math.pow(2, (height - 69) / 12) * 440;
+    return {
+        empty: false,
+        acc,
+        alt,
+        chroma,
+        coord,
+        freq,
+        height,
+        letter,
+        midi,
+        name,
+        oct,
+        pc,
+        step,
+    };
+}
+function pitchName$1(props) {
+    const { step, alt, oct } = props;
+    const letter = stepToLetter(step);
+    if (!letter) {
+        return "";
+    }
+    const pc = letter + altToAcc(alt);
+    return oct || oct === 0 ? pc + oct : pc;
+}
+
+const NoInterval = { empty: true, name: "", acc: "" };
+// shorthand tonal notation (with quality after number)
+const INTERVAL_TONAL_REGEX = "([-+]?\\d+)(d{1,4}|m|M|P|A{1,4})";
+// standard shorthand notation (with quality before number)
+const INTERVAL_SHORTHAND_REGEX = "(AA|A|P|M|m|d|dd)([-+]?\\d+)";
+const REGEX = new RegExp("^" + INTERVAL_TONAL_REGEX + "|" + INTERVAL_SHORTHAND_REGEX + "$");
+/**
+ * @private
+ */
+function tokenizeInterval(str) {
+    const m = REGEX.exec(`${str}`);
+    if (m === null) {
+        return ["", ""];
+    }
+    return m[1] ? [m[1], m[2]] : [m[4], m[3]];
+}
+const cache = {};
+/**
+ * Get interval properties. It returns an object with:
+ *
+ * - name: the interval name
+ * - num: the interval number
+ * - type: 'perfectable' or 'majorable'
+ * - q: the interval quality (d, m, M, A)
+ * - dir: interval direction (1 ascending, -1 descending)
+ * - simple: the simplified number
+ * - semitones: the size in semitones
+ * - chroma: the interval chroma
+ *
+ * @param {string} interval - the interval name
+ * @return {Object} the interval properties
+ *
+ * @example
+ * import { interval } from '@tonaljs/core'
+ * interval('P5').semitones // => 7
+ * interval('m3').type // => 'majorable'
+ */
+function interval(src) {
+    return typeof src === "string"
+        ? cache[src] || (cache[src] = parse(src))
+        : isPitch(src)
+            ? interval(pitchName(src))
+            : isNamed(src)
+                ? interval(src.name)
+                : NoInterval;
+}
+const SIZES = [0, 2, 4, 5, 7, 9, 11];
+const TYPES = "PMMPPMM";
+function parse(str) {
+    const tokens = tokenizeInterval(str);
+    if (tokens[0] === "") {
+        return NoInterval;
+    }
+    const num = +tokens[0];
+    const q = tokens[1];
+    const step = (Math.abs(num) - 1) % 7;
+    const t = TYPES[step];
+    if (t === "M" && q === "P") {
+        return NoInterval;
+    }
+    const type = t === "M" ? "majorable" : "perfectable";
+    const name = "" + num + q;
+    const dir = num < 0 ? -1 : 1;
+    const simple = num === 8 || num === -8 ? num : dir * (step + 1);
+    const alt = qToAlt(type, q);
+    const oct = Math.floor((Math.abs(num) - 1) / 7);
+    const semitones = dir * (SIZES[step] + alt + 12 * oct);
+    const chroma = (((dir * (SIZES[step] + alt)) % 12) + 12) % 12;
+    const coord = encode({ step, alt, oct, dir });
+    return {
+        empty: false,
+        name,
+        num,
+        q,
+        step,
+        alt,
+        dir,
+        type,
+        simple,
+        semitones,
+        chroma,
+        coord,
+        oct,
+    };
+}
+/**
+ * @private
+ *
+ * forceDescending is used in the case of unison (#243)
+ */
+function coordToInterval(coord, forceDescending) {
+    const [f, o = 0] = coord;
+    const isDescending = f * 7 + o * 12 < 0;
+    const ivl = forceDescending || isDescending ? [-f, -o, -1] : [f, o, 1];
+    return interval(decode(ivl));
+}
+function qToAlt(type, q) {
+    return (q === "M" && type === "majorable") ||
+        (q === "P" && type === "perfectable")
+        ? 0
+        : q === "m" && type === "majorable"
+            ? -1
+            : /^A+$/.test(q)
+                ? q.length
+                : /^d+$/.test(q)
+                    ? -1 * (type === "perfectable" ? q.length : q.length + 1)
+                    : 0;
+}
+// return the interval name of a pitch
+function pitchName(props) {
+    const { step, alt, oct = 0, dir } = props;
+    if (!dir) {
+        return "";
+    }
+    const calcNum = step + 1 + 7 * oct;
+    // this is an edge case: descending pitch class unison (see #243)
+    const num = calcNum === 0 ? step + 1 : calcNum;
+    const d = dir < 0 ? "-" : "";
+    const type = TYPES[step] === "M" ? "majorable" : "perfectable";
+    const name = d + num + altToQ(type, alt);
+    return name;
+}
+function altToQ(type, alt) {
+    if (alt === 0) {
+        return type === "majorable" ? "M" : "P";
+    }
+    else if (alt === -1 && type === "majorable") {
+        return "m";
+    }
+    else if (alt > 0) {
+        return fillStr("A", alt);
+    }
+    else {
+        return fillStr("d", type === "perfectable" ? alt : alt + 1);
+    }
+}
+
+/**
+ * Transpose a note by an interval.
+ *
+ * @param {string} note - the note or note name
+ * @param {string} interval - the interval or interval name
+ * @return {string} the transposed note name or empty string if not valid notes
+ * @example
+ * import { tranpose } from "@tonaljs/core"
+ * transpose("d3", "3M") // => "F#3"
+ * transpose("D", "3M") // => "F#"
+ * ["C", "D", "E", "F", "G"].map(pc => transpose(pc, "M3)) // => ["E", "F#", "G#", "A", "B"]
+ */
+function transpose(noteName, intervalName) {
+    const note$1 = note(noteName);
+    const interval$1 = interval(intervalName);
+    if (note$1.empty || interval$1.empty) {
+        return "";
+    }
+    const noteCoord = note$1.coord;
+    const intervalCoord = interval$1.coord;
+    const tr = noteCoord.length === 1
+        ? [noteCoord[0] + intervalCoord[0]]
+        : [noteCoord[0] + intervalCoord[0], noteCoord[1] + intervalCoord[1]];
+    return coordToNote(tr).name;
+}
+/**
+ * Find the interval distance between two notes or coord classes.
+ *
+ * To find distance between coord classes, both notes must be coord classes and
+ * the interval is always ascending
+ *
+ * @param {Note|string} from - the note or note name to calculate distance from
+ * @param {Note|string} to - the note or note name to calculate distance to
+ * @return {string} the interval name or empty string if not valid notes
+ *
+ */
+function distance(fromNote, toNote) {
+    const from = note(fromNote);
+    const to = note(toNote);
+    if (from.empty || to.empty) {
+        return "";
+    }
+    const fcoord = from.coord;
+    const tcoord = to.coord;
+    const fifths = tcoord[0] - fcoord[0];
+    const octs = fcoord.length === 2 && tcoord.length === 2
+        ? tcoord[1] - fcoord[1]
+        : -Math.floor((fifths * 7) / 12);
+    // If it's unison and not pitch class, it can be descending interval (#243)
+    const forceDescending = to.height === from.height &&
+        to.midi !== null &&
+        from.midi !== null &&
+        from.step > to.step;
+    return coordToInterval([fifths, octs], forceDescending).name;
+}
+
+// ascending range
+function ascR(b, n) {
+    const a = [];
+    // tslint:disable-next-line:curly
+    for (; n--; a[n] = n + b)
+        ;
+    return a;
+}
+// descending range
+function descR(b, n) {
+    const a = [];
+    // tslint:disable-next-line:curly
+    for (; n--; a[n] = b - n)
+        ;
+    return a;
+}
+/**
+ * Creates a numeric range
+ *
+ * @param {number} from
+ * @param {number} to
+ * @return {Array<number>}
+ *
+ * @example
+ * range(-2, 2) // => [-2, -1, 0, 1, 2]
+ * range(2, -2) // => [2, 1, 0, -1, -2]
+ */
+function range(from, to) {
+    return from < to ? ascR(from, to - from + 1) : descR(from, from - to + 1);
+}
+/**
+ * Rotates a list a number of times. It"s completly agnostic about the
+ * contents of the list.
+ *
+ * @param {Integer} times - the number of rotations
+ * @param {Array} collection
+ * @return {Array} the rotated collection
+ *
+ * @example
+ * rotate(1, [1, 2, 3]) // => [2, 3, 1]
+ */
+function rotate(times, arr) {
+    const len = arr.length;
+    const n = ((times % len) + len) % len;
+    return arr.slice(n, len).concat(arr.slice(0, n));
+}
+/**
+ * Return a copy of the collection with the null values removed
+ * @function
+ * @param {Array} collection
+ * @return {Array}
+ *
+ * @example
+ * compact(["a", "b", null, "c"]) // => ["a", "b", "c"]
+ */
+function compact(arr) {
+    return arr.filter((n) => n === 0 || n);
+}
+
+const EmptyPcset = {
+    empty: true,
+    name: "",
+    setNum: 0,
+    chroma: "000000000000",
+    normalized: "000000000000",
+    intervals: [],
+};
+// UTILITIES
+const setNumToChroma = (num) => Number(num).toString(2);
+const chromaToNumber = (chroma) => parseInt(chroma, 2);
+const REGEX$2 = /^[01]{12}$/;
+function isChroma(set) {
+    return REGEX$2.test(set);
+}
+const isPcsetNum = (set) => typeof set === "number" && set >= 0 && set <= 4095;
+const isPcset = (set) => set && isChroma(set.chroma);
+const cache$2 = { [EmptyPcset.chroma]: EmptyPcset };
+/**
+ * Get the pitch class set of a collection of notes or set number or chroma
+ */
+function get(src) {
+    const chroma = isChroma(src)
+        ? src
+        : isPcsetNum(src)
+            ? setNumToChroma(src)
+            : Array.isArray(src)
+                ? listToChroma(src)
+                : isPcset(src)
+                    ? src.chroma
+                    : EmptyPcset.chroma;
+    return (cache$2[chroma] = cache$2[chroma] || chromaToPcset(chroma));
+}
+const IVLS = [
+    "1P",
+    "2m",
+    "2M",
+    "3m",
+    "3M",
+    "4P",
+    "5d",
+    "5P",
+    "6m",
+    "6M",
+    "7m",
+    "7M",
+];
+/**
+ * @private
+ * Get the intervals of a pcset *starting from C*
+ * @param {Set} set - the pitch class set
+ * @return {IntervalName[]} an array of interval names or an empty array
+ * if not a valid pitch class set
+ */
+function chromaToIntervals(chroma) {
+    const intervals = [];
+    for (let i = 0; i < 12; i++) {
+        // tslint:disable-next-line:curly
+        if (chroma.charAt(i) === "1")
+            intervals.push(IVLS[i]);
+    }
+    return intervals;
+}
+/**
+ * Given a a list of notes or a pcset chroma, produce the rotations
+ * of the chroma discarding the ones that starts with "0"
+ *
+ * This is used, for example, to get all the modes of a scale.
+ *
+ * @param {Array|string} set - the list of notes or pitchChr of the set
+ * @param {boolean} normalize - (Optional, true by default) remove all
+ * the rotations that starts with "0"
+ * @return {Array<string>} an array with all the modes of the chroma
+ *
+ * @example
+ * Pcset.modes(["C", "D", "E"]).map(Pcset.intervals)
+ */
+function modes(set, normalize = true) {
+    const pcs = get(set);
+    const binary = pcs.chroma.split("");
+    return compact(binary.map((_, i) => {
+        const r = rotate(i, binary);
+        return normalize && r[0] === "0" ? null : r.join("");
+    }));
+}
+/**
+ * Create a function that test if a collection of notes is a
+ * subset of a given set
+ *
+ * The function is curryfied.
+ *
+ * @param {PcsetChroma|NoteName[]} set - the superset to test against (chroma or
+ * list of notes)
+ * @return{function(PcsetChroma|NoteNames[]): boolean} a function accepting a set
+ * to test against (chroma or list of notes)
+ * @example
+ * const inCMajor = Pcset.isSubsetOf(["C", "E", "G"])
+ * inCMajor(["e6", "c4"]) // => true
+ * inCMajor(["e6", "c4", "d3"]) // => false
+ */
+function isSubsetOf(set) {
+    const s = get(set).setNum;
+    return (notes) => {
+        const o = get(notes).setNum;
+        // tslint:disable-next-line: no-bitwise
+        return s && s !== o && (o & s) === o;
+    };
+}
+/**
+ * Create a function that test if a collection of notes is a
+ * superset of a given set (it contains all notes and at least one more)
+ *
+ * @param {Set} set - an array of notes or a chroma set string to test against
+ * @return {(subset: Set): boolean} a function that given a set
+ * returns true if is a subset of the first one
+ * @example
+ * const extendsCMajor = Pcset.isSupersetOf(["C", "E", "G"])
+ * extendsCMajor(["e6", "a", "c4", "g2"]) // => true
+ * extendsCMajor(["c6", "e4", "g3"]) // => false
+ */
+function isSupersetOf(set) {
+    const s = get(set).setNum;
+    return (notes) => {
+        const o = get(notes).setNum;
+        // tslint:disable-next-line: no-bitwise
+        return s && s !== o && (o | s) === o;
+    };
+}
+//// PRIVATE ////
+function chromaRotations(chroma) {
+    const binary = chroma.split("");
+    return binary.map((_, i) => rotate(i, binary).join(""));
+}
+function chromaToPcset(chroma) {
+    const setNum = chromaToNumber(chroma);
+    const normalizedNum = chromaRotations(chroma)
+        .map(chromaToNumber)
+        .filter((n) => n >= 2048)
+        .sort()[0];
+    const normalized = setNumToChroma(normalizedNum);
+    const intervals = chromaToIntervals(chroma);
+    return {
+        empty: false,
+        name: "",
+        setNum,
+        chroma,
+        normalized,
+        intervals,
+    };
+}
+function listToChroma(set) {
+    if (set.length === 0) {
+        return EmptyPcset.chroma;
+    }
+    let pitch;
+    const binary = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+    // tslint:disable-next-line:prefer-for-of
+    for (let i = 0; i < set.length; i++) {
+        pitch = note(set[i]);
+        // tslint:disable-next-line: curly
+        if (pitch.empty)
+            pitch = interval(set[i]);
+        // tslint:disable-next-line: curly
+        if (!pitch.empty)
+            binary[pitch.chroma] = 1;
+    }
+    return binary.join("");
+}
+
+/**
+ * @private
+ * Chord List
+ * Source: https://en.wikibooks.org/wiki/Music_Theory/Complete_List_of_Chord_Patterns
+ * Format: ["intervals", "full name", "abrv1 abrv2"]
+ */
+const CHORDS = [
+    // ==Major==
+    ["1P 3M 5P", "major", "M ^ "],
+    ["1P 3M 5P 7M", "major seventh", "maj7 Δ ma7 M7 Maj7 ^7"],
+    ["1P 3M 5P 7M 9M", "major ninth", "maj9 Δ9 ^9"],
+    ["1P 3M 5P 7M 9M 13M", "major thirteenth", "maj13 Maj13 ^13"],
+    ["1P 3M 5P 6M", "sixth", "6 add6 add13 M6"],
+    ["1P 3M 5P 6M 9M", "sixth/ninth", "6/9 69 M69"],
+    ["1P 3M 6m 7M", "major seventh flat sixth", "M7b6 ^7b6"],
+    [
+        "1P 3M 5P 7M 11A",
+        "major seventh sharp eleventh",
+        "maj#4 Δ#4 Δ#11 M7#11 ^7#11 maj7#11",
+    ],
+    // ==Minor==
+    // '''Normal'''
+    ["1P 3m 5P", "minor", "m min -"],
+    ["1P 3m 5P 7m", "minor seventh", "m7 min7 mi7 -7"],
+    [
+        "1P 3m 5P 7M",
+        "minor/major seventh",
+        "m/ma7 m/maj7 mM7 mMaj7 m/M7 -Δ7 mΔ -^7",
+    ],
+    ["1P 3m 5P 6M", "minor sixth", "m6 -6"],
+    ["1P 3m 5P 7m 9M", "minor ninth", "m9 -9"],
+    ["1P 3m 5P 7M 9M", "minor/major ninth", "mM9 mMaj9 -^9"],
+    ["1P 3m 5P 7m 9M 11P", "minor eleventh", "m11 -11"],
+    ["1P 3m 5P 7m 9M 13M", "minor thirteenth", "m13 -13"],
+    // '''Diminished'''
+    ["1P 3m 5d", "diminished", "dim ° o"],
+    ["1P 3m 5d 7d", "diminished seventh", "dim7 °7 o7"],
+    ["1P 3m 5d 7m", "half-diminished", "m7b5 ø -7b5 h7 h"],
+    // ==Dominant/Seventh==
+    // '''Normal'''
+    ["1P 3M 5P 7m", "dominant seventh", "7 dom"],
+    ["1P 3M 5P 7m 9M", "dominant ninth", "9"],
+    ["1P 3M 5P 7m 9M 13M", "dominant thirteenth", "13"],
+    ["1P 3M 5P 7m 11A", "lydian dominant seventh", "7#11 7#4"],
+    // '''Altered'''
+    ["1P 3M 5P 7m 9m", "dominant flat ninth", "7b9"],
+    ["1P 3M 5P 7m 9A", "dominant sharp ninth", "7#9"],
+    ["1P 3M 7m 9m", "altered", "alt7"],
+    // '''Suspended'''
+    ["1P 4P 5P", "suspended fourth", "sus4 sus"],
+    ["1P 2M 5P", "suspended second", "sus2"],
+    ["1P 4P 5P 7m", "suspended fourth seventh", "7sus4 7sus"],
+    ["1P 5P 7m 9M 11P", "eleventh", "11"],
+    [
+        "1P 4P 5P 7m 9m",
+        "suspended fourth flat ninth",
+        "b9sus phryg 7b9sus 7b9sus4",
+    ],
+    // ==Other==
+    ["1P 5P", "fifth", "5"],
+    ["1P 3M 5A", "augmented", "aug + +5 ^#5"],
+    ["1P 3m 5A", "minor augmented", "m#5 -#5 m+"],
+    ["1P 3M 5A 7M", "augmented seventh", "maj7#5 maj7+5 +maj7 ^7#5"],
+    [
+        "1P 3M 5P 7M 9M 11A",
+        "major sharp eleventh (lydian)",
+        "maj9#11 Δ9#11 ^9#11",
+    ],
+    // ==Legacy==
+    ["1P 2M 4P 5P", "", "sus24 sus4add9"],
+    ["1P 3M 5A 7M 9M", "", "maj9#5 Maj9#5"],
+    ["1P 3M 5A 7m", "", "7#5 +7 7+ 7aug aug7"],
+    ["1P 3M 5A 7m 9A", "", "7#5#9 7#9#5 7alt"],
+    ["1P 3M 5A 7m 9M", "", "9#5 9+"],
+    ["1P 3M 5A 7m 9M 11A", "", "9#5#11"],
+    ["1P 3M 5A 7m 9m", "", "7#5b9 7b9#5"],
+    ["1P 3M 5A 7m 9m 11A", "", "7#5b9#11"],
+    ["1P 3M 5A 9A", "", "+add#9"],
+    ["1P 3M 5A 9M", "", "M#5add9 +add9"],
+    ["1P 3M 5P 6M 11A", "", "M6#11 M6b5 6#11 6b5"],
+    ["1P 3M 5P 6M 7M 9M", "", "M7add13"],
+    ["1P 3M 5P 6M 9M 11A", "", "69#11"],
+    ["1P 3m 5P 6M 9M", "", "m69 -69"],
+    ["1P 3M 5P 6m 7m", "", "7b6"],
+    ["1P 3M 5P 7M 9A 11A", "", "maj7#9#11"],
+    ["1P 3M 5P 7M 9M 11A 13M", "", "M13#11 maj13#11 M13+4 M13#4"],
+    ["1P 3M 5P 7M 9m", "", "M7b9"],
+    ["1P 3M 5P 7m 11A 13m", "", "7#11b13 7b5b13"],
+    ["1P 3M 5P 7m 13M", "", "7add6 67 7add13"],
+    ["1P 3M 5P 7m 9A 11A", "", "7#9#11 7b5#9 7#9b5"],
+    ["1P 3M 5P 7m 9A 11A 13M", "", "13#9#11"],
+    ["1P 3M 5P 7m 9A 11A 13m", "", "7#9#11b13"],
+    ["1P 3M 5P 7m 9A 13M", "", "13#9"],
+    ["1P 3M 5P 7m 9A 13m", "", "7#9b13"],
+    ["1P 3M 5P 7m 9M 11A", "", "9#11 9+4 9#4"],
+    ["1P 3M 5P 7m 9M 11A 13M", "", "13#11 13+4 13#4"],
+    ["1P 3M 5P 7m 9M 11A 13m", "", "9#11b13 9b5b13"],
+    ["1P 3M 5P 7m 9m 11A", "", "7b9#11 7b5b9 7b9b5"],
+    ["1P 3M 5P 7m 9m 11A 13M", "", "13b9#11"],
+    ["1P 3M 5P 7m 9m 11A 13m", "", "7b9b13#11 7b9#11b13 7b5b9b13"],
+    ["1P 3M 5P 7m 9m 13M", "", "13b9"],
+    ["1P 3M 5P 7m 9m 13m", "", "7b9b13"],
+    ["1P 3M 5P 7m 9m 9A", "", "7b9#9"],
+    ["1P 3M 5P 9M", "", "Madd9 2 add9 add2"],
+    ["1P 3M 5P 9m", "", "Maddb9"],
+    ["1P 3M 5d", "", "Mb5"],
+    ["1P 3M 5d 6M 7m 9M", "", "13b5"],
+    ["1P 3M 5d 7M", "", "M7b5"],
+    ["1P 3M 5d 7M 9M", "", "M9b5"],
+    ["1P 3M 5d 7m", "", "7b5"],
+    ["1P 3M 5d 7m 9M", "", "9b5"],
+    ["1P 3M 7m", "", "7no5"],
+    ["1P 3M 7m 13m", "", "7b13"],
+    ["1P 3M 7m 9M", "", "9no5"],
+    ["1P 3M 7m 9M 13M", "", "13no5"],
+    ["1P 3M 7m 9M 13m", "", "9b13"],
+    ["1P 3m 4P 5P", "", "madd4"],
+    ["1P 3m 5P 6m 7M", "", "mMaj7b6"],
+    ["1P 3m 5P 6m 7M 9M", "", "mMaj9b6"],
+    ["1P 3m 5P 7m 11P", "", "m7add11 m7add4"],
+    ["1P 3m 5P 9M", "", "madd9"],
+    ["1P 3m 5d 6M 7M", "", "o7M7"],
+    ["1P 3m 5d 7M", "", "oM7"],
+    ["1P 3m 6m 7M", "", "mb6M7"],
+    ["1P 3m 6m 7m", "", "m7#5"],
+    ["1P 3m 6m 7m 9M", "", "m9#5"],
+    ["1P 3m 5A 7m 9M 11P", "", "m11A"],
+    ["1P 3m 6m 9m", "", "mb6b9"],
+    ["1P 2M 3m 5d 7m", "", "m9b5"],
+    ["1P 4P 5A 7M", "", "M7#5sus4"],
+    ["1P 4P 5A 7M 9M", "", "M9#5sus4"],
+    ["1P 4P 5A 7m", "", "7#5sus4"],
+    ["1P 4P 5P 7M", "", "M7sus4"],
+    ["1P 4P 5P 7M 9M", "", "M9sus4"],
+    ["1P 4P 5P 7m 9M", "", "9sus4 9sus"],
+    ["1P 4P 5P 7m 9M 13M", "", "13sus4 13sus"],
+    ["1P 4P 5P 7m 9m 13m", "", "7sus4b9b13 7b9b13sus4"],
+    ["1P 4P 7m 10m", "", "4 quartal"],
+    ["1P 5P 7m 9m 11P", "", "11b9"],
+];
+let dictionary = [];
+/**
+ * Return a list of all chord types
+ */
+function all() {
+    return dictionary.slice();
+}
+/**
+ * Add a chord to the dictionary.
+ * @param intervals
+ * @param aliases
+ * @param [fullName]
+ */
+function add(intervals, aliases, fullName) {
+    const quality = getQuality(intervals);
+    const chord = {
+        ...get(intervals),
+        name: fullName || "",
+        quality,
+        intervals,
+        aliases,
+    };
+    dictionary.push(chord);
+    chord.aliases.forEach((alias) => addAlias());
+}
+function addAlias(chord, alias) {
+}
+function getQuality(intervals) {
+    const has = (interval) => intervals.indexOf(interval) !== -1;
+    return has("5A")
+        ? "Augmented"
+        : has("3M")
+            ? "Major"
+            : has("5d")
+                ? "Diminished"
+                : has("3m")
+                    ? "Minor"
+                    : "Unknown";
+}
+CHORDS.forEach(([ivls, fullName, names]) => add(ivls.split(" "), names.split(" "), fullName));
+dictionary.sort((a, b) => a.setNum - b.setNum);
+
+// SCALES
+// Format: ["intervals", "name", "alias1", "alias2", ...]
+const SCALES = [
+    // 5-note scales
+    ["1P 2M 3M 5P 6M", "major pentatonic", "pentatonic"],
+    ["1P 3M 4P 5P 7M", "ionian pentatonic"],
+    ["1P 3M 4P 5P 7m", "mixolydian pentatonic", "indian"],
+    ["1P 2M 4P 5P 6M", "ritusen"],
+    ["1P 2M 4P 5P 7m", "egyptian"],
+    ["1P 3M 4P 5d 7m", "neopolitan major pentatonic"],
+    ["1P 3m 4P 5P 6m", "vietnamese 1"],
+    ["1P 2m 3m 5P 6m", "pelog"],
+    ["1P 2m 4P 5P 6m", "kumoijoshi"],
+    ["1P 2M 3m 5P 6m", "hirajoshi"],
+    ["1P 2m 4P 5d 7m", "iwato"],
+    ["1P 2m 4P 5P 7m", "in-sen"],
+    ["1P 3M 4A 5P 7M", "lydian pentatonic", "chinese"],
+    ["1P 3m 4P 6m 7m", "malkos raga"],
+    ["1P 3m 4P 5d 7m", "locrian pentatonic", "minor seven flat five pentatonic"],
+    ["1P 3m 4P 5P 7m", "minor pentatonic", "vietnamese 2"],
+    ["1P 3m 4P 5P 6M", "minor six pentatonic"],
+    ["1P 2M 3m 5P 6M", "flat three pentatonic", "kumoi"],
+    ["1P 2M 3M 5P 6m", "flat six pentatonic"],
+    ["1P 2m 3M 5P 6M", "scriabin"],
+    ["1P 3M 5d 6m 7m", "whole tone pentatonic"],
+    ["1P 3M 4A 5A 7M", "lydian #5P pentatonic"],
+    ["1P 3M 4A 5P 7m", "lydian dominant pentatonic"],
+    ["1P 3m 4P 5P 7M", "minor #7M pentatonic"],
+    ["1P 3m 4d 5d 7m", "super locrian pentatonic"],
+    // 6-note scales
+    ["1P 2M 3m 4P 5P 7M", "minor hexatonic"],
+    ["1P 2A 3M 5P 5A 7M", "augmented"],
+    ["1P 2M 3m 3M 5P 6M", "major blues"],
+    ["1P 2M 4P 5P 6M 7m", "piongio"],
+    ["1P 2m 3M 4A 6M 7m", "prometheus neopolitan"],
+    ["1P 2M 3M 4A 6M 7m", "prometheus"],
+    ["1P 2m 3M 5d 6m 7m", "mystery #1"],
+    ["1P 2m 3M 4P 5A 6M", "six tone symmetric"],
+    ["1P 2M 3M 4A 5A 7m", "whole tone", "messiaen's mode #1"],
+    ["1P 2m 4P 4A 5P 7M", "messiaen's mode #5"],
+    ["1P 3m 4P 5d 5P 7m", "minor blues", "blues"],
+    // 7-note scales
+    ["1P 2M 3M 4P 5d 6m 7m", "locrian major", "arabian"],
+    ["1P 2m 3M 4A 5P 6m 7M", "double harmonic lydian"],
+    ["1P 2M 3m 4P 5P 6m 7M", "harmonic minor"],
+    [
+        "1P 2m 2A 3M 4A 6m 7m",
+        "altered",
+        "super locrian",
+        "diminished whole tone",
+        "pomeroy",
+    ],
+    ["1P 2M 3m 4P 5d 6m 7m", "locrian #2", "half-diminished", "aeolian b5"],
+    [
+        "1P 2M 3M 4P 5P 6m 7m",
+        "mixolydian b6",
+        "melodic minor fifth mode",
+        "hindu",
+    ],
+    ["1P 2M 3M 4A 5P 6M 7m", "lydian dominant", "lydian b7", "overtone"],
+    ["1P 2M 3M 4A 5P 6M 7M", "lydian"],
+    ["1P 2M 3M 4A 5A 6M 7M", "lydian augmented"],
+    [
+        "1P 2m 3m 4P 5P 6M 7m",
+        "dorian b2",
+        "phrygian #6",
+        "melodic minor second mode",
+    ],
+    ["1P 2M 3m 4P 5P 6M 7M", "melodic minor"],
+    ["1P 2m 3m 4P 5d 6m 7m", "locrian"],
+    [
+        "1P 2m 3m 4d 5d 6m 7d",
+        "ultralocrian",
+        "superlocrian bb7",
+        "superlocrian diminished",
+    ],
+    ["1P 2m 3m 4P 5d 6M 7m", "locrian 6", "locrian natural 6", "locrian sharp 6"],
+    ["1P 2A 3M 4P 5P 5A 7M", "augmented heptatonic"],
+    // Source https://en.wikipedia.org/wiki/Ukrainian_Dorian_scale
+    [
+        "1P 2M 3m 4A 5P 6M 7m",
+        "dorian #4",
+        "ukrainian dorian",
+        "romanian minor",
+        "altered dorian",
+    ],
+    ["1P 2M 3m 4A 5P 6M 7M", "lydian diminished"],
+    ["1P 2m 3m 4P 5P 6m 7m", "phrygian"],
+    ["1P 2M 3M 4A 5A 7m 7M", "leading whole tone"],
+    ["1P 2M 3M 4A 5P 6m 7m", "lydian minor"],
+    ["1P 2m 3M 4P 5P 6m 7m", "phrygian dominant", "spanish", "phrygian major"],
+    ["1P 2m 3m 4P 5P 6m 7M", "balinese"],
+    ["1P 2m 3m 4P 5P 6M 7M", "neopolitan major"],
+    ["1P 2M 3m 4P 5P 6m 7m", "aeolian", "minor"],
+    ["1P 2M 3M 4P 5P 6m 7M", "harmonic major"],
+    ["1P 2m 3M 4P 5P 6m 7M", "double harmonic major", "gypsy"],
+    ["1P 2M 3m 4P 5P 6M 7m", "dorian"],
+    ["1P 2M 3m 4A 5P 6m 7M", "hungarian minor"],
+    ["1P 2A 3M 4A 5P 6M 7m", "hungarian major"],
+    ["1P 2m 3M 4P 5d 6M 7m", "oriental"],
+    ["1P 2m 3m 3M 4A 5P 7m", "flamenco"],
+    ["1P 2m 3m 4A 5P 6m 7M", "todi raga"],
+    ["1P 2M 3M 4P 5P 6M 7m", "mixolydian", "dominant"],
+    ["1P 2m 3M 4P 5d 6m 7M", "persian"],
+    ["1P 2M 3M 4P 5P 6M 7M", "major", "ionian"],
+    ["1P 2m 3M 5d 6m 7m 7M", "enigmatic"],
+    [
+        "1P 2M 3M 4P 5A 6M 7M",
+        "major augmented",
+        "major #5",
+        "ionian augmented",
+        "ionian #5",
+    ],
+    ["1P 2A 3M 4A 5P 6M 7M", "lydian #9"],
+    // 8-note scales
+    ["1P 2m 2M 4P 4A 5P 6m 7M", "messiaen's mode #4"],
+    ["1P 2m 3M 4P 4A 5P 6m 7M", "purvi raga"],
+    ["1P 2m 3m 3M 4P 5P 6m 7m", "spanish heptatonic"],
+    ["1P 2M 3M 4P 5P 6M 7m 7M", "bebop"],
+    ["1P 2M 3m 3M 4P 5P 6M 7m", "bebop minor"],
+    ["1P 2M 3M 4P 5P 5A 6M 7M", "bebop major"],
+    ["1P 2m 3m 4P 5d 5P 6m 7m", "bebop locrian"],
+    ["1P 2M 3m 4P 5P 6m 7m 7M", "minor bebop"],
+    ["1P 2M 3m 4P 5d 6m 6M 7M", "diminished", "whole-half diminished"],
+    ["1P 2M 3M 4P 5d 5P 6M 7M", "ichikosucho"],
+    ["1P 2M 3m 4P 5P 6m 6M 7M", "minor six diminished"],
+    [
+        "1P 2m 3m 3M 4A 5P 6M 7m",
+        "half-whole diminished",
+        "dominant diminished",
+        "messiaen's mode #2",
+    ],
+    ["1P 3m 3M 4P 5P 6M 7m 7M", "kafi raga"],
+    ["1P 2M 3M 4P 4A 5A 6A 7M", "messiaen's mode #6"],
+    // 9-note scales
+    ["1P 2M 3m 3M 4P 5d 5P 6M 7m", "composite blues"],
+    ["1P 2M 3m 3M 4A 5P 6m 7m 7M", "messiaen's mode #3"],
+    // 10-note scales
+    ["1P 2m 2M 3m 4P 4A 5P 6m 6M 7M", "messiaen's mode #7"],
+    // 12-note scales
+    ["1P 2m 2M 3m 3M 4P 5d 5P 6m 6M 7m 7M", "chromatic"],
+];
+
+const NoScaleType = {
+    ...EmptyPcset,
+    intervals: [],
+    aliases: [],
+};
+let dictionary$1 = [];
+let index = {};
+function names() {
+    return dictionary$1.map((scale) => scale.name);
+}
+/**
+ * Given a scale name or chroma, return the scale properties
+ *
+ * @param {string} type - scale name or pitch class set chroma
+ * @example
+ * import { get } from 'tonaljs/scale-type'
+ * get('major') // => { name: 'major', ... }
+ */
+function get$1(type) {
+    return index[type] || NoScaleType;
+}
+/**
+ * Return a list of all scale types
+ */
+function all$1() {
+    return dictionary$1.slice();
+}
+/**
+ * Add a scale into dictionary
+ * @param intervals
+ * @param name
+ * @param aliases
+ */
+function add$1(intervals, name, aliases = []) {
+    const scale = { ...get(intervals), name, intervals, aliases };
+    dictionary$1.push(scale);
+    index[scale.name] = scale;
+    index[scale.setNum] = scale;
+    index[scale.chroma] = scale;
+    scale.aliases.forEach((alias) => addAlias$1(scale, alias));
+    return scale;
+}
+function addAlias$1(scale, alias) {
+    index[alias] = scale;
+}
+SCALES.forEach(([ivls, name, ...aliases]) => add$1(ivls.split(" "), name, aliases));
+
+/**
+ * Get the natural list of names
+ */
+function names$1() {
+    return "1P 2M 3M 4P 5P 6m 7m".split(" ");
+}
+/**
+ * Get properties of an interval
+ *
+ * @function
+ * @example
+ * Interval.get('P4') // => {"alt": 0,  "dir": 1,  "name": "4P", "num": 4, "oct": 0, "q": "P", "semitones": 5, "simple": 4, "step": 3, "type": "perfectable"}
+ */
+const get$2 = interval;
+/**
+ * Get name of an interval
+ *
+ * @function
+ * @example
+ * Interval.name('4P') // => "4P"
+ * Interval.name('P4') // => "4P"
+ * Interval.name('C4') // => ""
+ */
+const name = (name) => interval(name).name;
+/**
+ * Get semitones of an interval
+ * @function
+ * @example
+ * Interval.semitones('P4') // => 5
+ */
+const semitones = (name) => interval(name).semitones;
+/**
+ * Get quality of an interval
+ * @function
+ * @example
+ * Interval.quality('P4') // => "P"
+ */
+const quality = (name) => interval(name).q;
+/**
+ * Get number of an interval
+ * @function
+ * @example
+ * Interval.num('P4') // => 4
+ */
+const num = (name) => interval(name).num;
+/**
+ * Get the simplified version of an interval.
+ *
+ * @function
+ * @param {string} interval - the interval to simplify
+ * @return {string} the simplified interval
+ *
+ * @example
+ * Interval.simplify("9M") // => "2M"
+ * Interval.simplify("2M") // => "2M"
+ * Interval.simplify("-2M") // => "7m"
+ * ["8P", "9M", "10M", "11P", "12P", "13M", "14M", "15P"].map(Interval.simplify)
+ * // => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "8P" ]
+ */
+function simplify(name) {
+    const i = interval(name);
+    return i.empty ? "" : i.simple + i.q;
+}
+/**
+ * Get the inversion (https://en.wikipedia.org/wiki/Inversion_(music)#Intervals)
+ * of an interval.
+ *
+ * @function
+ * @param {string} interval - the interval to invert in interval shorthand
+ * notation or interval array notation
+ * @return {string} the inverted interval
+ *
+ * @example
+ * Interval.invert("3m") // => "6M"
+ * Interval.invert("2M") // => "7m"
+ */
+function invert(name) {
+    const i = interval(name);
+    if (i.empty) {
+        return "";
+    }
+    const step = (7 - i.step) % 7;
+    const alt = i.type === "perfectable" ? -i.alt : -(i.alt + 1);
+    return interval({ step, alt, oct: i.oct, dir: i.dir }).name;
+}
+// interval numbers
+const IN = [1, 2, 2, 3, 3, 4, 5, 5, 6, 6, 7, 7];
+// interval qualities
+const IQ = "P m M m M P d P m M m M".split(" ");
+/**
+ * Get interval name from semitones number. Since there are several interval
+ * names for the same number, the name it's arbitrary, but deterministic.
+ *
+ * @param {Integer} num - the number of semitones (can be negative)
+ * @return {string} the interval name
+ * @example
+ * Interval.fromSemitones(7) // => "5P"
+ * Interval.fromSemitones(-7) // => "-5P"
+ */
+function fromSemitones(semitones) {
+    const d = semitones < 0 ? -1 : 1;
+    const n = Math.abs(semitones);
+    const c = n % 12;
+    const o = Math.floor(n / 12);
+    return d * (IN[c] + 7 * o) + IQ[c];
+}
+/**
+ * Find interval between two notes
+ *
+ * @example
+ * Interval.distance("C4", "G4"); // => "5P"
+ */
+const distance$1 = distance;
+/**
+ * Adds two intervals
+ *
+ * @function
+ * @param {string} interval1
+ * @param {string} interval2
+ * @return {string} the added interval name
+ * @example
+ * Interval.add("3m", "5P") // => "7m"
+ */
+const add$2 = combinator((a, b) => [a[0] + b[0], a[1] + b[1]]);
+/**
+ * Returns a function that adds an interval
+ *
+ * @function
+ * @example
+ * ['1P', '2M', '3M'].map(Interval.addTo('5P')) // => ["5P", "6M", "7M"]
+ */
+const addTo = (interval) => (other) => add$2(interval, other);
+/**
+ * Subtracts two intervals
+ *
+ * @function
+ * @param {string} minuendInterval
+ * @param {string} subtrahendInterval
+ * @return {string} the substracted interval name
+ * @example
+ * Interval.substract('5P', '3M') // => '3m'
+ * Interval.substract('3M', '5P') // => '-3m'
+ */
+const substract = combinator((a, b) => [a[0] - b[0], a[1] - b[1]]);
+function transposeFifths(interval, fifths) {
+    const ivl = get$2(interval);
+    if (ivl.empty)
+        return "";
+    const [nFifths, nOcts, dir] = ivl.coord;
+    return coordToInterval([nFifths + fifths, nOcts, dir]).name;
+}
+var index$1 = {
+    names: names$1,
+    get: get$2,
+    name,
+    num,
+    semitones,
+    quality,
+    fromSemitones,
+    distance: distance$1,
+    invert,
+    simplify,
+    add: add$2,
+    addTo,
+    substract,
+    transposeFifths,
+};
+function combinator(fn) {
+    return (a, b) => {
+        const coordA = interval(a).coord;
+        const coordB = interval(b).coord;
+        if (coordA && coordB) {
+            const coord = fn(coordA, coordB);
+            return coordToInterval(coord).name;
+        }
+    };
+}
+
+const L2 = Math.log(2);
+const L440 = Math.log(440);
+/**
+ * Get the midi number from a frequency in hertz. The midi number can
+ * contain decimals (with two digits precission)
+ *
+ * @param {number} frequency
+ * @return {number}
+ * @example
+ * import { freqToMidi} from '@tonaljs/midi'
+ * freqToMidi(220)); //=> 57
+ * freqToMidi(261.62)); //=> 60
+ * freqToMidi(261)); //=> 59.96
+ */
+function freqToMidi(freq) {
+    const v = (12 * (Math.log(freq) - L440)) / L2 + 69;
+    return Math.round(v * 100) / 100;
+}
+const SHARPS = "C C# D D# E F F# G G# A A# B".split(" ");
+const FLATS = "C Db D Eb E F Gb G Ab A Bb B".split(" ");
+/**
+ * Given a midi number, returns a note name. The altered notes will have
+ * flats unless explicitly set with the optional `useSharps` parameter.
+ *
+ * @function
+ * @param {number} midi - the midi note number
+ * @param {Object} options = default: `{ sharps: false, pitchClass: false }`
+ * @param {boolean} useSharps - (Optional) set to true to use sharps instead of flats
+ * @return {string} the note name
+ * @example
+ * import { midiToNoteName } from '@tonaljs/midi'
+ * midiToNoteName(61) // => "Db4"
+ * midiToNoteName(61, { pitchClass: true }) // => "Db"
+ * midiToNoteName(61, { sharps: true }) // => "C#4"
+ * midiToNoteName(61, { pitchClass: true, sharps: true }) // => "C#"
+ * // it rounds to nearest note
+ * midiToNoteName(61.7) // => "D4"
+ */
+function midiToNoteName(midi, options = {}) {
+    if (isNaN(midi) || midi === -Infinity || midi === Infinity)
+        return "";
+    midi = Math.round(midi);
+    const pcs = options.sharps === true ? SHARPS : FLATS;
+    const pc = pcs[midi % 12];
+    if (options.pitchClass) {
+        return pc;
+    }
+    const o = Math.floor(midi / 12) - 1;
+    return pc + o;
+}
+
+const NAMES = ["C", "D", "E", "F", "G", "A", "B"];
+const toName = (n) => n.name;
+const onlyNotes = (array) => array.map(note).filter((n) => !n.empty);
+/**
+ * Return the natural note names without octave
+ * @function
+ * @example
+ * Note.names(); // => ["C", "D", "E", "F", "G", "A", "B"]
+ */
+function names$2(array) {
+    if (array === undefined) {
+        return NAMES.slice();
+    }
+    else if (!Array.isArray(array)) {
+        return [];
+    }
+    else {
+        return onlyNotes(array).map(toName);
+    }
+}
+/**
+ * Get a note from a note name
+ *
+ * @function
+ * @example
+ * Note.get('Bb4') // => { name: "Bb4", midi: 70, chroma: 10, ... }
+ */
+const get$3 = note;
+/**
+ * Get the note name
+ * @function
+ */
+const name$1 = (note) => get$3(note).name;
+/**
+ * Get the note pitch class name
+ * @function
+ */
+const pitchClass = (note) => get$3(note).pc;
+/**
+ * Get the note accidentals
+ * @function
+ */
+const accidentals = (note) => get$3(note).acc;
+/**
+ * Get the note octave
+ * @function
+ */
+const octave = (note) => get$3(note).oct;
+/**
+ * Get the note midi
+ * @function
+ */
+const midi = (note) => get$3(note).midi;
+/**
+ * Get the note midi
+ * @function
+ */
+const freq = (note) => get$3(note).freq;
+/**
+ * Get the note chroma
+ * @function
+ */
+const chroma = (note) => get$3(note).chroma;
+/**
+ * Given a midi number, returns a note name. Uses flats for altered notes.
+ *
+ * @function
+ * @param {number} midi - the midi note number
+ * @return {string} the note name
+ * @example
+ * Note.fromMidi(61) // => "Db4"
+ * Note.fromMidi(61.7) // => "D4"
+ */
+function fromMidi(midi) {
+    return midiToNoteName(midi);
+}
+/**
+ * Given a midi number, returns a note name. Uses flats for altered notes.
+ */
+function fromFreq(freq) {
+    return midiToNoteName(freqToMidi(freq));
+}
+/**
+ * Given a midi number, returns a note name. Uses flats for altered notes.
+ */
+function fromFreqSharps(freq) {
+    return midiToNoteName(freqToMidi(freq), { sharps: true });
+}
+/**
+ * Given a midi number, returns a note name. Uses flats for altered notes.
+ *
+ * @function
+ * @param {number} midi - the midi note number
+ * @return {string} the note name
+ * @example
+ * Note.fromMidiSharps(61) // => "C#4"
+ */
+function fromMidiSharps(midi) {
+    return midiToNoteName(midi, { sharps: true });
+}
+/**
+ * Transpose a note by an interval
+ */
+const transpose$1 = transpose;
+const tr = transpose;
+/**
+ * Transpose by an interval.
+ * @function
+ * @param {string} interval
+ * @return {function} a function that transposes by the given interval
+ * @example
+ * ["C", "D", "E"].map(Note.transposeBy("5P"));
+ * // => ["G", "A", "B"]
+ */
+const transposeBy = (interval) => (note) => transpose$1(note, interval);
+const trBy = transposeBy;
+/**
+ * Transpose from a note
+ * @function
+ * @param {string} note
+ * @return {function}  a function that transposes the the note by an interval
+ * ["1P", "3M", "5P"].map(Note.transposeFrom("C"));
+ * // => ["C", "E", "G"]
+ */
+const transposeFrom = (note) => (interval) => transpose$1(note, interval);
+const trFrom = transposeFrom;
+/**
+ * Transpose a note by a number of perfect fifths.
+ *
+ * @function
+ * @param {string} note - the note name
+ * @param {number} fifhts - the number of fifths
+ * @return {string} the transposed note name
+ *
+ * @example
+ * import { transposeFifths } from "@tonaljs/note"
+ * transposeFifths("G4", 1) // => "D"
+ * [0, 1, 2, 3, 4].map(fifths => transposeFifths("C", fifths)) // => ["C", "G", "D", "A", "E"]
+ */
+function transposeFifths$1(noteName, fifths) {
+    const note = get$3(noteName);
+    if (note.empty) {
+        return "";
+    }
+    const [nFifths, nOcts] = note.coord;
+    const transposed = nOcts === undefined
+        ? coordToNote([nFifths + fifths])
+        : coordToNote([nFifths + fifths, nOcts]);
+    return transposed.name;
+}
+const trFifths = transposeFifths$1;
+const ascending = (a, b) => a.height - b.height;
+const descending = (a, b) => b.height - a.height;
+function sortedNames(notes, comparator) {
+    comparator = comparator || ascending;
+    return onlyNotes(notes).sort(comparator).map(toName);
+}
+function sortedUniqNames(notes) {
+    return sortedNames(notes, ascending).filter((n, i, a) => i === 0 || n !== a[i - 1]);
+}
+/**
+ * Simplify a note
+ *
+ * @function
+ * @param {string} note - the note to be simplified
+ * - sameAccType: default true. Use same kind of accidentals that source
+ * @return {string} the simplified note or '' if not valid note
+ * @example
+ * simplify("C##") // => "D"
+ * simplify("C###") // => "D#"
+ * simplify("C###")
+ * simplify("B#4") // => "C5"
+ */
+const simplify$1 = (noteName) => {
+    const note = get$3(noteName);
+    if (note.empty) {
+        return "";
+    }
+    return midiToNoteName(note.midi || note.chroma, {
+        sharps: note.alt > 0,
+        pitchClass: note.midi === null,
+    });
+};
+/**
+ * Get enharmonic of a note
+ *
+ * @function
+ * @param {string} note
+ * @param [string] - [optional] Destination pitch class
+ * @return {string} the enharmonic note name or '' if not valid note
+ * @example
+ * Note.enharmonic("Db") // => "C#"
+ * Note.enharmonic("C") // => "C"
+ * Note.enharmonic("F2","E#") // => "E#2"
+ */
+function enharmonic(noteName, destName) {
+    const src = get$3(noteName);
+    if (src.empty) {
+        return "";
+    }
+    // destination: use given or generate one
+    const dest = get$3(destName ||
+        midiToNoteName(src.midi || src.chroma, {
+            sharps: src.alt < 0,
+            pitchClass: true,
+        }));
+    // ensure destination is valid
+    if (dest.empty || dest.chroma !== src.chroma) {
+        return "";
+    }
+    // if src has no octave, no need to calculate anything else
+    if (src.oct === undefined) {
+        return dest.pc;
+    }
+    // detect any octave overflow
+    const srcChroma = src.chroma - src.alt;
+    const destChroma = dest.chroma - dest.alt;
+    const destOctOffset = srcChroma > 11 || destChroma < 0
+        ? -1
+        : srcChroma < 0 || destChroma > 11
+            ? +1
+            : 0;
+    // calculate the new octave
+    const destOct = src.oct + destOctOffset;
+    return dest.pc + destOct;
+}
+var index$2 = {
+    names: names$2,
+    get: get$3,
+    name: name$1,
+    pitchClass,
+    accidentals,
+    octave,
+    midi,
+    ascending,
+    descending,
+    sortedNames,
+    sortedUniqNames,
+    fromMidi,
+    fromMidiSharps,
+    freq,
+    fromFreq,
+    fromFreqSharps,
+    chroma,
+    transpose: transpose$1,
+    tr,
+    transposeBy,
+    trBy,
+    transposeFrom,
+    trFrom,
+    transposeFifths: transposeFifths$1,
+    trFifths,
+    simplify: simplify$1,
+    enharmonic,
+};
+
+const Empty = Object.freeze([]);
+
+const MODES = [
+    [0, 2773, 0, "ionian", "", "Maj7", "major"],
+    [1, 2902, 2, "dorian", "m", "m7"],
+    [2, 3418, 4, "phrygian", "m", "m7"],
+    [3, 2741, -1, "lydian", "", "Maj7"],
+    [4, 2774, 1, "mixolydian", "", "7"],
+    [5, 2906, 3, "aeolian", "m", "m7", "minor"],
+    [6, 3434, 5, "locrian", "dim", "m7b5"],
+];
+const NoMode = {
+    ...EmptyPcset,
+    name: "",
+    alt: 0,
+    modeNum: NaN,
+    triad: "",
+    seventh: "",
+    aliases: [],
+};
+const modes$1 = MODES.map(toMode);
+const index$3 = {};
+modes$1.forEach((mode) => {
+    index$3[mode.name] = mode;
+    mode.aliases.forEach((alias) => {
+        index$3[alias] = mode;
+    });
+});
+/**
+ * Get a Mode by it's name
+ *
+ * @example
+ * get('dorian')
+ * // =>
+ * // {
+ * //   intervals: [ '1P', '2M', '3m', '4P', '5P', '6M', '7m' ],
+ * //   modeNum: 1,
+ * //   chroma: '101101010110',
+ * //   normalized: '101101010110',
+ * //   name: 'dorian',
+ * //   setNum: 2902,
+ * //   alt: 2,
+ * //   triad: 'm',
+ * //   seventh: 'm7',
+ * //   aliases: []
+ * // }
+ */
+function get$4(name) {
+    return typeof name === "string"
+        ? index$3[name.toLowerCase()] || NoMode
+        : name && name.name
+            ? get$4(name.name)
+            : NoMode;
+}
+function toMode(mode) {
+    const [modeNum, setNum, alt, name, triad, seventh, alias] = mode;
+    const aliases = alias ? [alias] : [];
+    const chroma = Number(setNum).toString(2);
+    const intervals = get$1(name).intervals;
+    return {
+        empty: false,
+        intervals,
+        modeNum,
+        chroma,
+        normalized: chroma,
+        name,
+        setNum,
+        alt,
+        triad,
+        seventh,
+        aliases,
+    };
+}
+function chords(chords) {
+    return (modeName, tonic) => {
+        const mode = get$4(modeName);
+        if (mode.empty)
+            return [];
+        const triads = rotate(mode.modeNum, chords);
+        const tonics = mode.intervals.map((i) => transpose(tonic, i));
+        return triads.map((triad, i) => tonics[i] + triad);
+    };
+}
+const triads = chords(MODES.map((x) => x[4]));
+const seventhChords = chords(MODES.map((x) => x[5]));
+
+/**
+ * References:
+ * - https://www.researchgate.net/publication/327567188_An_Algorithm_for_Spelling_the_Pitches_of_Any_Musical_Scale
+ * @module scale
+ */
+const NoScale = {
+    empty: true,
+    name: "",
+    type: "",
+    tonic: null,
+    setNum: NaN,
+    chroma: "",
+    normalized: "",
+    aliases: [],
+    notes: [],
+    intervals: [],
+};
+/**
+ * Given a string with a scale name and (optionally) a tonic, split
+ * that components.
+ *
+ * It retuns an array with the form [ name, tonic ] where tonic can be a
+ * note name or null and name can be any arbitrary string
+ * (this function doesn"t check if that scale name exists)
+ *
+ * @function
+ * @param {string} name - the scale name
+ * @return {Array} an array [tonic, name]
+ * @example
+ * tokenize("C mixolydean") // => ["C", "mixolydean"]
+ * tokenize("anything is valid") // => ["", "anything is valid"]
+ * tokenize() // => ["", ""]
+ */
+function tokenize(name) {
+    if (typeof name !== "string") {
+        return ["", ""];
+    }
+    const i = name.indexOf(" ");
+    const tonic = note(name.substring(0, i));
+    if (tonic.empty) {
+        const n = note(name);
+        return n.empty ? ["", name] : [n.name, ""];
+    }
+    const type = name.substring(tonic.name.length + 1);
+    return [tonic.name, type.length ? type : ""];
+}
+/**
+ * Get all scale names
+ * @function
+ */
+const names$3 = names;
+/**
+ * Get a Scale from a scale name.
+ */
+function get$5(src) {
+    const tokens = Array.isArray(src) ? src : tokenize(src);
+    const tonic = note(tokens[0]).name;
+    const st = get$1(tokens[1]);
+    if (st.empty) {
+        return NoScale;
+    }
+    const type = st.name;
+    const notes = tonic
+        ? st.intervals.map((i) => transpose(tonic, i))
+        : [];
+    const name = tonic ? tonic + " " + type : type;
+    return { ...st, name, type, tonic, notes };
+}
+const scale = deprecate("Scale.scale", "Scale.get", get$5);
+/**
+ * Get all chords that fits a given scale
+ *
+ * @function
+ * @param {string} name - the scale name
+ * @return {Array<string>} - the chord names
+ *
+ * @example
+ * scaleChords("pentatonic") // => ["5", "64", "M", "M6", "Madd9", "Msus2"]
+ */
+function scaleChords(name) {
+    const s = get$5(name);
+    const inScale = isSubsetOf(s.chroma);
+    return all()
+        .filter((chord) => inScale(chord.chroma))
+        .map((chord) => chord.aliases[0]);
+}
+/**
+ * Get all scales names that are a superset of the given one
+ * (has the same notes and at least one more)
+ *
+ * @function
+ * @param {string} name
+ * @return {Array} a list of scale names
+ * @example
+ * extended("major") // => ["bebop", "bebop dominant", "bebop major", "chromatic", "ichikosucho"]
+ */
+function extended(name) {
+    const s = get$5(name);
+    const isSuperset = isSupersetOf(s.chroma);
+    return all$1()
+        .filter((scale) => isSuperset(scale.chroma))
+        .map((scale) => scale.name);
+}
+/**
+ * Find all scales names that are a subset of the given one
+ * (has less notes but all from the given scale)
+ *
+ * @function
+ * @param {string} name
+ * @return {Array} a list of scale names
+ *
+ * @example
+ * reduced("major") // => ["ionian pentatonic", "major pentatonic", "ritusen"]
+ */
+function reduced(name) {
+    const isSubset = isSubsetOf(get$5(name).chroma);
+    return all$1()
+        .filter((scale) => isSubset(scale.chroma))
+        .map((scale) => scale.name);
+}
+/**
+ * Given an array of notes, return the scale: a pitch class set starting from
+ * the first note of the array
+ *
+ * @function
+ * @param {string[]} notes
+ * @return {string[]} pitch classes with same tonic
+ * @example
+ * scaleNotes(['C4', 'c3', 'C5', 'C4', 'c4']) // => ["C"]
+ * scaleNotes(['D4', 'c#5', 'A5', 'F#6']) // => ["D", "F#", "A", "C#"]
+ */
+function scaleNotes(notes) {
+    const pcset = notes.map((n) => note(n).pc).filter((x) => x);
+    const tonic = pcset[0];
+    const scale = sortedUniqNames(pcset);
+    return rotate(scale.indexOf(tonic), scale);
+}
+/**
+ * Find mode names of a scale
+ *
+ * @function
+ * @param {string} name - scale name
+ * @example
+ * modeNames("C pentatonic") // => [
+ *   ["C", "major pentatonic"],
+ *   ["D", "egyptian"],
+ *   ["E", "malkos raga"],
+ *   ["G", "ritusen"],
+ *   ["A", "minor pentatonic"]
+ * ]
+ */
+function modeNames(name) {
+    const s = get$5(name);
+    if (s.empty) {
+        return [];
+    }
+    const tonics = s.tonic ? s.notes : s.intervals;
+    return modes(s.chroma)
+        .map((chroma, i) => {
+        const modeName = get$5(chroma).name;
+        return modeName ? [tonics[i], modeName] : ["", ""];
+    })
+        .filter((x) => x[0]);
+}
+function getNoteNameOf(scale) {
+    const names = Array.isArray(scale) ? scaleNotes(scale) : get$5(scale).notes;
+    const chromas = names.map((name) => note(name).chroma);
+    return (noteOrMidi) => {
+        const currNote = typeof noteOrMidi === "number"
+            ? note(fromMidi(noteOrMidi))
+            : note(noteOrMidi);
+        const height = currNote.height;
+        if (height === undefined)
+            return undefined;
+        const chroma = height % 12;
+        const position = chromas.indexOf(chroma);
+        if (position === -1)
+            return undefined;
+        return enharmonic(currNote.name, names[position]);
+    };
+}
+function rangeOf(scale) {
+    const getName = getNoteNameOf(scale);
+    return (fromNote, toNote) => {
+        const from = note(fromNote).height;
+        const to = note(toNote).height;
+        if (from === undefined || to === undefined)
+            return [];
+        return range(from, to)
+            .map(getName)
+            .filter((x) => x);
+    };
+}
+var index$4 = {
+    get: get$5,
+    names: names$3,
+    extended,
+    modeNames,
+    reduced,
+    scaleChords,
+    scaleNotes,
+    tokenize,
+    rangeOf,
+    // deprecated
+    scale,
+};
+
+export { index$1 as Interval, index$2 as Note, index$4 as Scale };
diff --git a/docs/_snowpack/pkg/codemirror/lib/codemirror.css b/docs/_snowpack/pkg/codemirror/lib/codemirror.css
new file mode 100644
index 00000000..f4d5718a
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/lib/codemirror.css
@@ -0,0 +1,344 @@
+/* BASICS */
+
+.CodeMirror {
+  /* Set height, width, borders, and global font properties here */
+  font-family: monospace;
+  height: 300px;
+  color: black;
+  direction: ltr;
+}
+
+/* PADDING */
+
+.CodeMirror-lines {
+  padding: 4px 0; /* Vertical padding around content */
+}
+.CodeMirror pre.CodeMirror-line,
+.CodeMirror pre.CodeMirror-line-like {
+  padding: 0 4px; /* Horizontal padding of content */
+}
+
+.CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
+  background-color: white; /* The little square between H and V scrollbars */
+}
+
+/* GUTTER */
+
+.CodeMirror-gutters {
+  border-right: 1px solid #ddd;
+  background-color: #f7f7f7;
+  white-space: nowrap;
+}
+.CodeMirror-linenumbers {}
+.CodeMirror-linenumber {
+  padding: 0 3px 0 5px;
+  min-width: 20px;
+  text-align: right;
+  color: #999;
+  white-space: nowrap;
+}
+
+.CodeMirror-guttermarker { color: black; }
+.CodeMirror-guttermarker-subtle { color: #999; }
+
+/* CURSOR */
+
+.CodeMirror-cursor {
+  border-left: 1px solid black;
+  border-right: none;
+  width: 0;
+}
+/* Shown when moving in bi-directional text */
+.CodeMirror div.CodeMirror-secondarycursor {
+  border-left: 1px solid silver;
+}
+.cm-fat-cursor .CodeMirror-cursor {
+  width: auto;
+  border: 0 !important;
+  background: #7e7;
+}
+.cm-fat-cursor div.CodeMirror-cursors {
+  z-index: 1;
+}
+.cm-fat-cursor .CodeMirror-line::selection,
+.cm-fat-cursor .CodeMirror-line > span::selection, 
+.cm-fat-cursor .CodeMirror-line > span > span::selection { background: transparent; }
+.cm-fat-cursor .CodeMirror-line::-moz-selection,
+.cm-fat-cursor .CodeMirror-line > span::-moz-selection,
+.cm-fat-cursor .CodeMirror-line > span > span::-moz-selection { background: transparent; }
+.cm-fat-cursor { caret-color: transparent; }
+@-moz-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@-webkit-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+
+/* Can style cursor different in overwrite (non-insert) mode */
+.CodeMirror-overwrite .CodeMirror-cursor {}
+
+.cm-tab { display: inline-block; text-decoration: inherit; }
+
+.CodeMirror-rulers {
+  position: absolute;
+  left: 0; right: 0; top: -50px; bottom: 0;
+  overflow: hidden;
+}
+.CodeMirror-ruler {
+  border-left: 1px solid #ccc;
+  top: 0; bottom: 0;
+  position: absolute;
+}
+
+/* DEFAULT THEME */
+
+.cm-s-default .cm-header {color: blue;}
+.cm-s-default .cm-quote {color: #090;}
+.cm-negative {color: #d44;}
+.cm-positive {color: #292;}
+.cm-header, .cm-strong {font-weight: bold;}
+.cm-em {font-style: italic;}
+.cm-link {text-decoration: underline;}
+.cm-strikethrough {text-decoration: line-through;}
+
+.cm-s-default .cm-keyword {color: #708;}
+.cm-s-default .cm-atom {color: #219;}
+.cm-s-default .cm-number {color: #164;}
+.cm-s-default .cm-def {color: #00f;}
+.cm-s-default .cm-variable,
+.cm-s-default .cm-punctuation,
+.cm-s-default .cm-property,
+.cm-s-default .cm-operator {}
+.cm-s-default .cm-variable-2 {color: #05a;}
+.cm-s-default .cm-variable-3, .cm-s-default .cm-type {color: #085;}
+.cm-s-default .cm-comment {color: #a50;}
+.cm-s-default .cm-string {color: #a11;}
+.cm-s-default .cm-string-2 {color: #f50;}
+.cm-s-default .cm-meta {color: #555;}
+.cm-s-default .cm-qualifier {color: #555;}
+.cm-s-default .cm-builtin {color: #30a;}
+.cm-s-default .cm-bracket {color: #997;}
+.cm-s-default .cm-tag {color: #170;}
+.cm-s-default .cm-attribute {color: #00c;}
+.cm-s-default .cm-hr {color: #999;}
+.cm-s-default .cm-link {color: #00c;}
+
+.cm-s-default .cm-error {color: #f00;}
+.cm-invalidchar {color: #f00;}
+
+.CodeMirror-composing { border-bottom: 2px solid; }
+
+/* Default styles for common addons */
+
+div.CodeMirror span.CodeMirror-matchingbracket {color: #0b0;}
+div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #a22;}
+.CodeMirror-matchingtag { background: rgba(255, 150, 0, .3); }
+.CodeMirror-activeline-background {background: #e8f2ff;}
+
+/* STOP */
+
+/* The rest of this file contains styles related to the mechanics of
+   the editor. You probably shouldn't touch them. */
+
+.CodeMirror {
+  position: relative;
+  overflow: hidden;
+  background: white;
+}
+
+.CodeMirror-scroll {
+  overflow: scroll !important; /* Things will break if this is overridden */
+  /* 50px is the magic margin used to hide the element's real scrollbars */
+  /* See overflow: hidden in .CodeMirror */
+  margin-bottom: -50px; margin-right: -50px;
+  padding-bottom: 50px;
+  height: 100%;
+  outline: none; /* Prevent dragging from highlighting the element */
+  position: relative;
+  z-index: 0;
+}
+.CodeMirror-sizer {
+  position: relative;
+  border-right: 50px solid transparent;
+}
+
+/* The fake, visible scrollbars. Used to force redraw during scrolling
+   before actual scrolling happens, thus preventing shaking and
+   flickering artifacts. */
+.CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
+  position: absolute;
+  z-index: 6;
+  display: none;
+  outline: none;
+}
+.CodeMirror-vscrollbar {
+  right: 0; top: 0;
+  overflow-x: hidden;
+  overflow-y: scroll;
+}
+.CodeMirror-hscrollbar {
+  bottom: 0; left: 0;
+  overflow-y: hidden;
+  overflow-x: scroll;
+}
+.CodeMirror-scrollbar-filler {
+  right: 0; bottom: 0;
+}
+.CodeMirror-gutter-filler {
+  left: 0; bottom: 0;
+}
+
+.CodeMirror-gutters {
+  position: absolute; left: 0; top: 0;
+  min-height: 100%;
+  z-index: 3;
+}
+.CodeMirror-gutter {
+  white-space: normal;
+  height: 100%;
+  display: inline-block;
+  vertical-align: top;
+  margin-bottom: -50px;
+}
+.CodeMirror-gutter-wrapper {
+  position: absolute;
+  z-index: 4;
+  background: none !important;
+  border: none !important;
+}
+.CodeMirror-gutter-background {
+  position: absolute;
+  top: 0; bottom: 0;
+  z-index: 4;
+}
+.CodeMirror-gutter-elt {
+  position: absolute;
+  cursor: default;
+  z-index: 4;
+}
+.CodeMirror-gutter-wrapper ::selection { background-color: transparent }
+.CodeMirror-gutter-wrapper ::-moz-selection { background-color: transparent }
+
+.CodeMirror-lines {
+  cursor: text;
+  min-height: 1px; /* prevents collapsing before first draw */
+}
+.CodeMirror pre.CodeMirror-line,
+.CodeMirror pre.CodeMirror-line-like {
+  /* Reset some styles that the rest of the page might have set */
+  -moz-border-radius: 0; -webkit-border-radius: 0; border-radius: 0;
+  border-width: 0;
+  background: transparent;
+  font-family: inherit;
+  font-size: inherit;
+  margin: 0;
+  white-space: pre;
+  word-wrap: normal;
+  line-height: inherit;
+  color: inherit;
+  z-index: 2;
+  position: relative;
+  overflow: visible;
+  -webkit-tap-highlight-color: transparent;
+  -webkit-font-variant-ligatures: contextual;
+  font-variant-ligatures: contextual;
+}
+.CodeMirror-wrap pre.CodeMirror-line,
+.CodeMirror-wrap pre.CodeMirror-line-like {
+  word-wrap: break-word;
+  white-space: pre-wrap;
+  word-break: normal;
+}
+
+.CodeMirror-linebackground {
+  position: absolute;
+  left: 0; right: 0; top: 0; bottom: 0;
+  z-index: 0;
+}
+
+.CodeMirror-linewidget {
+  position: relative;
+  z-index: 2;
+  padding: 0.1px; /* Force widget margins to stay inside of the container */
+}
+
+.CodeMirror-widget {}
+
+.CodeMirror-rtl pre { direction: rtl; }
+
+.CodeMirror-code {
+  outline: none;
+}
+
+/* Force content-box sizing for the elements where we expect it */
+.CodeMirror-scroll,
+.CodeMirror-sizer,
+.CodeMirror-gutter,
+.CodeMirror-gutters,
+.CodeMirror-linenumber {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+}
+
+.CodeMirror-measure {
+  position: absolute;
+  width: 100%;
+  height: 0;
+  overflow: hidden;
+  visibility: hidden;
+}
+
+.CodeMirror-cursor {
+  position: absolute;
+  pointer-events: none;
+}
+.CodeMirror-measure pre { position: static; }
+
+div.CodeMirror-cursors {
+  visibility: hidden;
+  position: relative;
+  z-index: 3;
+}
+div.CodeMirror-dragcursors {
+  visibility: visible;
+}
+
+.CodeMirror-focused div.CodeMirror-cursors {
+  visibility: visible;
+}
+
+.CodeMirror-selected { background: #d9d9d9; }
+.CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }
+.CodeMirror-crosshair { cursor: crosshair; }
+.CodeMirror-line::selection, .CodeMirror-line > span::selection, .CodeMirror-line > span > span::selection { background: #d7d4f0; }
+.CodeMirror-line::-moz-selection, .CodeMirror-line > span::-moz-selection, .CodeMirror-line > span > span::-moz-selection { background: #d7d4f0; }
+
+.cm-searching {
+  background-color: #ffa;
+  background-color: rgba(255, 255, 0, .4);
+}
+
+/* Used to force a border model for a node */
+.cm-force-border { padding-right: .1px; }
+
+@media print {
+  /* Hide the cursor when printing */
+  .CodeMirror div.CodeMirror-cursors {
+    visibility: hidden;
+  }
+}
+
+/* See issue #2901 */
+.cm-tab-wrap-hack:after { content: ''; }
+
+/* Help users use markselection to safely style text background */
+span.CodeMirror-selectedtext { background: none; }
diff --git a/docs/_snowpack/pkg/codemirror/lib/codemirror.css.proxy.js b/docs/_snowpack/pkg/codemirror/lib/codemirror.css.proxy.js
new file mode 100644
index 00000000..29c52d50
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/lib/codemirror.css.proxy.js
@@ -0,0 +1,10 @@
+// [snowpack] add styles to the page (skip if no document exists)
+if (typeof document !== 'undefined') {
+  const code = "/* BASICS */\n\n.CodeMirror {\n  /* Set height, width, borders, and global font properties here */\n  font-family: monospace;\n  height: 300px;\n  color: black;\n  direction: ltr;\n}\n\n/* PADDING */\n\n.CodeMirror-lines {\n  padding: 4px 0; /* Vertical padding around content */\n}\n.CodeMirror pre.CodeMirror-line,\n.CodeMirror pre.CodeMirror-line-like {\n  padding: 0 4px; /* Horizontal padding of content */\n}\n\n.CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {\n  background-color: white; /* The little square between H and V scrollbars */\n}\n\n/* GUTTER */\n\n.CodeMirror-gutters {\n  border-right: 1px solid #ddd;\n  background-color: #f7f7f7;\n  white-space: nowrap;\n}\n.CodeMirror-linenumbers {}\n.CodeMirror-linenumber {\n  padding: 0 3px 0 5px;\n  min-width: 20px;\n  text-align: right;\n  color: #999;\n  white-space: nowrap;\n}\n\n.CodeMirror-guttermarker { color: black; }\n.CodeMirror-guttermarker-subtle { color: #999; }\n\n/* CURSOR */\n\n.CodeMirror-cursor {\n  border-left: 1px solid black;\n  border-right: none;\n  width: 0;\n}\n/* Shown when moving in bi-directional text */\n.CodeMirror div.CodeMirror-secondarycursor {\n  border-left: 1px solid silver;\n}\n.cm-fat-cursor .CodeMirror-cursor {\n  width: auto;\n  border: 0 !important;\n  background: #7e7;\n}\n.cm-fat-cursor div.CodeMirror-cursors {\n  z-index: 1;\n}\n.cm-fat-cursor .CodeMirror-line::selection,\n.cm-fat-cursor .CodeMirror-line > span::selection, \n.cm-fat-cursor .CodeMirror-line > span > span::selection { background: transparent; }\n.cm-fat-cursor .CodeMirror-line::-moz-selection,\n.cm-fat-cursor .CodeMirror-line > span::-moz-selection,\n.cm-fat-cursor .CodeMirror-line > span > span::-moz-selection { background: transparent; }\n.cm-fat-cursor { caret-color: transparent; }\n@-moz-keyframes blink {\n  0% {}\n  50% { background-color: transparent; }\n  100% {}\n}\n@-webkit-keyframes blink {\n  0% {}\n  50% { background-color: transparent; }\n  100% {}\n}\n@keyframes blink {\n  0% {}\n  50% { background-color: transparent; }\n  100% {}\n}\n\n/* Can style cursor different in overwrite (non-insert) mode */\n.CodeMirror-overwrite .CodeMirror-cursor {}\n\n.cm-tab { display: inline-block; text-decoration: inherit; }\n\n.CodeMirror-rulers {\n  position: absolute;\n  left: 0; right: 0; top: -50px; bottom: 0;\n  overflow: hidden;\n}\n.CodeMirror-ruler {\n  border-left: 1px solid #ccc;\n  top: 0; bottom: 0;\n  position: absolute;\n}\n\n/* DEFAULT THEME */\n\n.cm-s-default .cm-header {color: blue;}\n.cm-s-default .cm-quote {color: #090;}\n.cm-negative {color: #d44;}\n.cm-positive {color: #292;}\n.cm-header, .cm-strong {font-weight: bold;}\n.cm-em {font-style: italic;}\n.cm-link {text-decoration: underline;}\n.cm-strikethrough {text-decoration: line-through;}\n\n.cm-s-default .cm-keyword {color: #708;}\n.cm-s-default .cm-atom {color: #219;}\n.cm-s-default .cm-number {color: #164;}\n.cm-s-default .cm-def {color: #00f;}\n.cm-s-default .cm-variable,\n.cm-s-default .cm-punctuation,\n.cm-s-default .cm-property,\n.cm-s-default .cm-operator {}\n.cm-s-default .cm-variable-2 {color: #05a;}\n.cm-s-default .cm-variable-3, .cm-s-default .cm-type {color: #085;}\n.cm-s-default .cm-comment {color: #a50;}\n.cm-s-default .cm-string {color: #a11;}\n.cm-s-default .cm-string-2 {color: #f50;}\n.cm-s-default .cm-meta {color: #555;}\n.cm-s-default .cm-qualifier {color: #555;}\n.cm-s-default .cm-builtin {color: #30a;}\n.cm-s-default .cm-bracket {color: #997;}\n.cm-s-default .cm-tag {color: #170;}\n.cm-s-default .cm-attribute {color: #00c;}\n.cm-s-default .cm-hr {color: #999;}\n.cm-s-default .cm-link {color: #00c;}\n\n.cm-s-default .cm-error {color: #f00;}\n.cm-invalidchar {color: #f00;}\n\n.CodeMirror-composing { border-bottom: 2px solid; }\n\n/* Default styles for common addons */\n\ndiv.CodeMirror span.CodeMirror-matchingbracket {color: #0b0;}\ndiv.CodeMirror span.CodeMirror-nonmatchingbracket {color: #a22;}\n.CodeMirror-matchingtag { background: rgba(255, 150, 0, .3); }\n.CodeMirror-activeline-background {background: #e8f2ff;}\n\n/* STOP */\n\n/* The rest of this file contains styles related to the mechanics of\n   the editor. You probably shouldn't touch them. */\n\n.CodeMirror {\n  position: relative;\n  overflow: hidden;\n  background: white;\n}\n\n.CodeMirror-scroll {\n  overflow: scroll !important; /* Things will break if this is overridden */\n  /* 50px is the magic margin used to hide the element's real scrollbars */\n  /* See overflow: hidden in .CodeMirror */\n  margin-bottom: -50px; margin-right: -50px;\n  padding-bottom: 50px;\n  height: 100%;\n  outline: none; /* Prevent dragging from highlighting the element */\n  position: relative;\n  z-index: 0;\n}\n.CodeMirror-sizer {\n  position: relative;\n  border-right: 50px solid transparent;\n}\n\n/* The fake, visible scrollbars. Used to force redraw during scrolling\n   before actual scrolling happens, thus preventing shaking and\n   flickering artifacts. */\n.CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {\n  position: absolute;\n  z-index: 6;\n  display: none;\n  outline: none;\n}\n.CodeMirror-vscrollbar {\n  right: 0; top: 0;\n  overflow-x: hidden;\n  overflow-y: scroll;\n}\n.CodeMirror-hscrollbar {\n  bottom: 0; left: 0;\n  overflow-y: hidden;\n  overflow-x: scroll;\n}\n.CodeMirror-scrollbar-filler {\n  right: 0; bottom: 0;\n}\n.CodeMirror-gutter-filler {\n  left: 0; bottom: 0;\n}\n\n.CodeMirror-gutters {\n  position: absolute; left: 0; top: 0;\n  min-height: 100%;\n  z-index: 3;\n}\n.CodeMirror-gutter {\n  white-space: normal;\n  height: 100%;\n  display: inline-block;\n  vertical-align: top;\n  margin-bottom: -50px;\n}\n.CodeMirror-gutter-wrapper {\n  position: absolute;\n  z-index: 4;\n  background: none !important;\n  border: none !important;\n}\n.CodeMirror-gutter-background {\n  position: absolute;\n  top: 0; bottom: 0;\n  z-index: 4;\n}\n.CodeMirror-gutter-elt {\n  position: absolute;\n  cursor: default;\n  z-index: 4;\n}\n.CodeMirror-gutter-wrapper ::selection { background-color: transparent }\n.CodeMirror-gutter-wrapper ::-moz-selection { background-color: transparent }\n\n.CodeMirror-lines {\n  cursor: text;\n  min-height: 1px; /* prevents collapsing before first draw */\n}\n.CodeMirror pre.CodeMirror-line,\n.CodeMirror pre.CodeMirror-line-like {\n  /* Reset some styles that the rest of the page might have set */\n  -moz-border-radius: 0; -webkit-border-radius: 0; border-radius: 0;\n  border-width: 0;\n  background: transparent;\n  font-family: inherit;\n  font-size: inherit;\n  margin: 0;\n  white-space: pre;\n  word-wrap: normal;\n  line-height: inherit;\n  color: inherit;\n  z-index: 2;\n  position: relative;\n  overflow: visible;\n  -webkit-tap-highlight-color: transparent;\n  -webkit-font-variant-ligatures: contextual;\n  font-variant-ligatures: contextual;\n}\n.CodeMirror-wrap pre.CodeMirror-line,\n.CodeMirror-wrap pre.CodeMirror-line-like {\n  word-wrap: break-word;\n  white-space: pre-wrap;\n  word-break: normal;\n}\n\n.CodeMirror-linebackground {\n  position: absolute;\n  left: 0; right: 0; top: 0; bottom: 0;\n  z-index: 0;\n}\n\n.CodeMirror-linewidget {\n  position: relative;\n  z-index: 2;\n  padding: 0.1px; /* Force widget margins to stay inside of the container */\n}\n\n.CodeMirror-widget {}\n\n.CodeMirror-rtl pre { direction: rtl; }\n\n.CodeMirror-code {\n  outline: none;\n}\n\n/* Force content-box sizing for the elements where we expect it */\n.CodeMirror-scroll,\n.CodeMirror-sizer,\n.CodeMirror-gutter,\n.CodeMirror-gutters,\n.CodeMirror-linenumber {\n  -moz-box-sizing: content-box;\n  box-sizing: content-box;\n}\n\n.CodeMirror-measure {\n  position: absolute;\n  width: 100%;\n  height: 0;\n  overflow: hidden;\n  visibility: hidden;\n}\n\n.CodeMirror-cursor {\n  position: absolute;\n  pointer-events: none;\n}\n.CodeMirror-measure pre { position: static; }\n\ndiv.CodeMirror-cursors {\n  visibility: hidden;\n  position: relative;\n  z-index: 3;\n}\ndiv.CodeMirror-dragcursors {\n  visibility: visible;\n}\n\n.CodeMirror-focused div.CodeMirror-cursors {\n  visibility: visible;\n}\n\n.CodeMirror-selected { background: #d9d9d9; }\n.CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }\n.CodeMirror-crosshair { cursor: crosshair; }\n.CodeMirror-line::selection, .CodeMirror-line > span::selection, .CodeMirror-line > span > span::selection { background: #d7d4f0; }\n.CodeMirror-line::-moz-selection, .CodeMirror-line > span::-moz-selection, .CodeMirror-line > span > span::-moz-selection { background: #d7d4f0; }\n\n.cm-searching {\n  background-color: #ffa;\n  background-color: rgba(255, 255, 0, .4);\n}\n\n/* Used to force a border model for a node */\n.cm-force-border { padding-right: .1px; }\n\n@media print {\n  /* Hide the cursor when printing */\n  .CodeMirror div.CodeMirror-cursors {\n    visibility: hidden;\n  }\n}\n\n/* See issue #2901 */\n.cm-tab-wrap-hack:after { content: ''; }\n\n/* Help users use markselection to safely style text background */\nspan.CodeMirror-selectedtext { background: none; }\n";
+
+  const styleEl = document.createElement("style");
+  const codeEl = document.createTextNode(code);
+  styleEl.type = 'text/css';
+  styleEl.appendChild(codeEl);
+  document.head.appendChild(styleEl);
+}
\ No newline at end of file
diff --git a/docs/_snowpack/pkg/codemirror/mode/javascript/javascript.js b/docs/_snowpack/pkg/codemirror/mode/javascript/javascript.js
new file mode 100644
index 00000000..865524eb
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/mode/javascript/javascript.js
@@ -0,0 +1,960 @@
+import { c as createCommonjsModule } from '../../../common/_commonjsHelpers-8c19dec8.js';
+import { c as codemirror } from '../../../common/codemirror-d650d44d.js';
+
+var javascript = createCommonjsModule(function (module, exports) {
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: https://codemirror.net/LICENSE
+
+(function(mod) {
+  mod(codemirror);
+})(function(CodeMirror) {
+
+CodeMirror.defineMode("javascript", function(config, parserConfig) {
+  var indentUnit = config.indentUnit;
+  var statementIndent = parserConfig.statementIndent;
+  var jsonldMode = parserConfig.jsonld;
+  var jsonMode = parserConfig.json || jsonldMode;
+  var trackScope = parserConfig.trackScope !== false;
+  var isTS = parserConfig.typescript;
+  var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;
+
+  // Tokenizer
+
+  var keywords = function(){
+    function kw(type) {return {type: type, style: "keyword"};}
+    var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c"), D = kw("keyword d");
+    var operator = kw("operator"), atom = {type: "atom", style: "atom"};
+
+    return {
+      "if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
+      "return": D, "break": D, "continue": D, "new": kw("new"), "delete": C, "void": C, "throw": C,
+      "debugger": kw("debugger"), "var": kw("var"), "const": kw("var"), "let": kw("var"),
+      "function": kw("function"), "catch": kw("catch"),
+      "for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
+      "in": operator, "typeof": operator, "instanceof": operator,
+      "true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
+      "this": kw("this"), "class": kw("class"), "super": kw("atom"),
+      "yield": C, "export": kw("export"), "import": kw("import"), "extends": C,
+      "await": C
+    };
+  }();
+
+  var isOperatorChar = /[+\-*&%=<>!?|~^@]/;
+  var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;
+
+  function readRegexp(stream) {
+    var escaped = false, next, inSet = false;
+    while ((next = stream.next()) != null) {
+      if (!escaped) {
+        if (next == "/" && !inSet) return;
+        if (next == "[") inSet = true;
+        else if (inSet && next == "]") inSet = false;
+      }
+      escaped = !escaped && next == "\\";
+    }
+  }
+
+  // Used as scratch variables to communicate multiple values without
+  // consing up tons of objects.
+  var type, content;
+  function ret(tp, style, cont) {
+    type = tp; content = cont;
+    return style;
+  }
+  function tokenBase(stream, state) {
+    var ch = stream.next();
+    if (ch == '"' || ch == "'") {
+      state.tokenize = tokenString(ch);
+      return state.tokenize(stream, state);
+    } else if (ch == "." && stream.match(/^\d[\d_]*(?:[eE][+\-]?[\d_]+)?/)) {
+      return ret("number", "number");
+    } else if (ch == "." && stream.match("..")) {
+      return ret("spread", "meta");
+    } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
+      return ret(ch);
+    } else if (ch == "=" && stream.eat(">")) {
+      return ret("=>", "operator");
+    } else if (ch == "0" && stream.match(/^(?:x[\dA-Fa-f_]+|o[0-7_]+|b[01_]+)n?/)) {
+      return ret("number", "number");
+    } else if (/\d/.test(ch)) {
+      stream.match(/^[\d_]*(?:n|(?:\.[\d_]*)?(?:[eE][+\-]?[\d_]+)?)?/);
+      return ret("number", "number");
+    } else if (ch == "/") {
+      if (stream.eat("*")) {
+        state.tokenize = tokenComment;
+        return tokenComment(stream, state);
+      } else if (stream.eat("/")) {
+        stream.skipToEnd();
+        return ret("comment", "comment");
+      } else if (expressionAllowed(stream, state, 1)) {
+        readRegexp(stream);
+        stream.match(/^\b(([gimyus])(?![gimyus]*\2))+\b/);
+        return ret("regexp", "string-2");
+      } else {
+        stream.eat("=");
+        return ret("operator", "operator", stream.current());
+      }
+    } else if (ch == "`") {
+      state.tokenize = tokenQuasi;
+      return tokenQuasi(stream, state);
+    } else if (ch == "#" && stream.peek() == "!") {
+      stream.skipToEnd();
+      return ret("meta", "meta");
+    } else if (ch == "#" && stream.eatWhile(wordRE)) {
+      return ret("variable", "property")
+    } else if (ch == "<" && stream.match("!--") ||
+               (ch == "-" && stream.match("->") && !/\S/.test(stream.string.slice(0, stream.start)))) {
+      stream.skipToEnd();
+      return ret("comment", "comment")
+    } else if (isOperatorChar.test(ch)) {
+      if (ch != ">" || !state.lexical || state.lexical.type != ">") {
+        if (stream.eat("=")) {
+          if (ch == "!" || ch == "=") stream.eat("=");
+        } else if (/[<>*+\-|&?]/.test(ch)) {
+          stream.eat(ch);
+          if (ch == ">") stream.eat(ch);
+        }
+      }
+      if (ch == "?" && stream.eat(".")) return ret(".")
+      return ret("operator", "operator", stream.current());
+    } else if (wordRE.test(ch)) {
+      stream.eatWhile(wordRE);
+      var word = stream.current();
+      if (state.lastType != ".") {
+        if (keywords.propertyIsEnumerable(word)) {
+          var kw = keywords[word];
+          return ret(kw.type, kw.style, word)
+        }
+        if (word == "async" && stream.match(/^(\s|\/\*([^*]|\*(?!\/))*?\*\/)*[\[\(\w]/, false))
+          return ret("async", "keyword", word)
+      }
+      return ret("variable", "variable", word)
+    }
+  }
+
+  function tokenString(quote) {
+    return function(stream, state) {
+      var escaped = false, next;
+      if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)){
+        state.tokenize = tokenBase;
+        return ret("jsonld-keyword", "meta");
+      }
+      while ((next = stream.next()) != null) {
+        if (next == quote && !escaped) break;
+        escaped = !escaped && next == "\\";
+      }
+      if (!escaped) state.tokenize = tokenBase;
+      return ret("string", "string");
+    };
+  }
+
+  function tokenComment(stream, state) {
+    var maybeEnd = false, ch;
+    while (ch = stream.next()) {
+      if (ch == "/" && maybeEnd) {
+        state.tokenize = tokenBase;
+        break;
+      }
+      maybeEnd = (ch == "*");
+    }
+    return ret("comment", "comment");
+  }
+
+  function tokenQuasi(stream, state) {
+    var escaped = false, next;
+    while ((next = stream.next()) != null) {
+      if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
+        state.tokenize = tokenBase;
+        break;
+      }
+      escaped = !escaped && next == "\\";
+    }
+    return ret("quasi", "string-2", stream.current());
+  }
+
+  var brackets = "([{}])";
+  // This is a crude lookahead trick to try and notice that we're
+  // parsing the argument patterns for a fat-arrow function before we
+  // actually hit the arrow token. It only works if the arrow is on
+  // the same line as the arguments and there's no strange noise
+  // (comments) in between. Fallback is to only notice when we hit the
+  // arrow, and not declare the arguments as locals for the arrow
+  // body.
+  function findFatArrow(stream, state) {
+    if (state.fatArrowAt) state.fatArrowAt = null;
+    var arrow = stream.string.indexOf("=>", stream.start);
+    if (arrow < 0) return;
+
+    if (isTS) { // Try to skip TypeScript return type declarations after the arguments
+      var m = /:\s*(?:\w+(?:<[^>]*>|\[\])?|\{[^}]*\})\s*$/.exec(stream.string.slice(stream.start, arrow));
+      if (m) arrow = m.index;
+    }
+
+    var depth = 0, sawSomething = false;
+    for (var pos = arrow - 1; pos >= 0; --pos) {
+      var ch = stream.string.charAt(pos);
+      var bracket = brackets.indexOf(ch);
+      if (bracket >= 0 && bracket < 3) {
+        if (!depth) { ++pos; break; }
+        if (--depth == 0) { if (ch == "(") sawSomething = true; break; }
+      } else if (bracket >= 3 && bracket < 6) {
+        ++depth;
+      } else if (wordRE.test(ch)) {
+        sawSomething = true;
+      } else if (/["'\/`]/.test(ch)) {
+        for (;; --pos) {
+          if (pos == 0) return
+          var next = stream.string.charAt(pos - 1);
+          if (next == ch && stream.string.charAt(pos - 2) != "\\") { pos--; break }
+        }
+      } else if (sawSomething && !depth) {
+        ++pos;
+        break;
+      }
+    }
+    if (sawSomething && !depth) state.fatArrowAt = pos;
+  }
+
+  // Parser
+
+  var atomicTypes = {"atom": true, "number": true, "variable": true, "string": true,
+                     "regexp": true, "this": true, "import": true, "jsonld-keyword": true};
+
+  function JSLexical(indented, column, type, align, prev, info) {
+    this.indented = indented;
+    this.column = column;
+    this.type = type;
+    this.prev = prev;
+    this.info = info;
+    if (align != null) this.align = align;
+  }
+
+  function inScope(state, varname) {
+    if (!trackScope) return false
+    for (var v = state.localVars; v; v = v.next)
+      if (v.name == varname) return true;
+    for (var cx = state.context; cx; cx = cx.prev) {
+      for (var v = cx.vars; v; v = v.next)
+        if (v.name == varname) return true;
+    }
+  }
+
+  function parseJS(state, style, type, content, stream) {
+    var cc = state.cc;
+    // Communicate our context to the combinators.
+    // (Less wasteful than consing up a hundred closures on every call.)
+    cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc; cx.style = style;
+
+    if (!state.lexical.hasOwnProperty("align"))
+      state.lexical.align = true;
+
+    while(true) {
+      var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
+      if (combinator(type, content)) {
+        while(cc.length && cc[cc.length - 1].lex)
+          cc.pop()();
+        if (cx.marked) return cx.marked;
+        if (type == "variable" && inScope(state, content)) return "variable-2";
+        return style;
+      }
+    }
+  }
+
+  // Combinator utils
+
+  var cx = {state: null, column: null, marked: null, cc: null};
+  function pass() {
+    for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
+  }
+  function cont() {
+    pass.apply(null, arguments);
+    return true;
+  }
+  function inList(name, list) {
+    for (var v = list; v; v = v.next) if (v.name == name) return true
+    return false;
+  }
+  function register(varname) {
+    var state = cx.state;
+    cx.marked = "def";
+    if (!trackScope) return
+    if (state.context) {
+      if (state.lexical.info == "var" && state.context && state.context.block) {
+        // FIXME function decls are also not block scoped
+        var newContext = registerVarScoped(varname, state.context);
+        if (newContext != null) {
+          state.context = newContext;
+          return
+        }
+      } else if (!inList(varname, state.localVars)) {
+        state.localVars = new Var(varname, state.localVars);
+        return
+      }
+    }
+    // Fall through means this is global
+    if (parserConfig.globalVars && !inList(varname, state.globalVars))
+      state.globalVars = new Var(varname, state.globalVars);
+  }
+  function registerVarScoped(varname, context) {
+    if (!context) {
+      return null
+    } else if (context.block) {
+      var inner = registerVarScoped(varname, context.prev);
+      if (!inner) return null
+      if (inner == context.prev) return context
+      return new Context(inner, context.vars, true)
+    } else if (inList(varname, context.vars)) {
+      return context
+    } else {
+      return new Context(context.prev, new Var(varname, context.vars), false)
+    }
+  }
+
+  function isModifier(name) {
+    return name == "public" || name == "private" || name == "protected" || name == "abstract" || name == "readonly"
+  }
+
+  // Combinators
+
+  function Context(prev, vars, block) { this.prev = prev; this.vars = vars; this.block = block; }
+  function Var(name, next) { this.name = name; this.next = next; }
+
+  var defaultVars = new Var("this", new Var("arguments", null));
+  function pushcontext() {
+    cx.state.context = new Context(cx.state.context, cx.state.localVars, false);
+    cx.state.localVars = defaultVars;
+  }
+  function pushblockcontext() {
+    cx.state.context = new Context(cx.state.context, cx.state.localVars, true);
+    cx.state.localVars = null;
+  }
+  pushcontext.lex = pushblockcontext.lex = true;
+  function popcontext() {
+    cx.state.localVars = cx.state.context.vars;
+    cx.state.context = cx.state.context.prev;
+  }
+  popcontext.lex = true;
+  function pushlex(type, info) {
+    var result = function() {
+      var state = cx.state, indent = state.indented;
+      if (state.lexical.type == "stat") indent = state.lexical.indented;
+      else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
+        indent = outer.indented;
+      state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
+    };
+    result.lex = true;
+    return result;
+  }
+  function poplex() {
+    var state = cx.state;
+    if (state.lexical.prev) {
+      if (state.lexical.type == ")")
+        state.indented = state.lexical.indented;
+      state.lexical = state.lexical.prev;
+    }
+  }
+  poplex.lex = true;
+
+  function expect(wanted) {
+    function exp(type) {
+      if (type == wanted) return cont();
+      else if (wanted == ";" || type == "}" || type == ")" || type == "]") return pass();
+      else return cont(exp);
+    }    return exp;
+  }
+
+  function statement(type, value) {
+    if (type == "var") return cont(pushlex("vardef", value), vardef, expect(";"), poplex);
+    if (type == "keyword a") return cont(pushlex("form"), parenExpr, statement, poplex);
+    if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
+    if (type == "keyword d") return cx.stream.match(/^\s*$/, false) ? cont() : cont(pushlex("stat"), maybeexpression, expect(";"), poplex);
+    if (type == "debugger") return cont(expect(";"));
+    if (type == "{") return cont(pushlex("}"), pushblockcontext, block, poplex, popcontext);
+    if (type == ";") return cont();
+    if (type == "if") {
+      if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
+        cx.state.cc.pop()();
+      return cont(pushlex("form"), parenExpr, statement, poplex, maybeelse);
+    }
+    if (type == "function") return cont(functiondef);
+    if (type == "for") return cont(pushlex("form"), pushblockcontext, forspec, statement, popcontext, poplex);
+    if (type == "class" || (isTS && value == "interface")) {
+      cx.marked = "keyword";
+      return cont(pushlex("form", type == "class" ? type : value), className, poplex)
+    }
+    if (type == "variable") {
+      if (isTS && value == "declare") {
+        cx.marked = "keyword";
+        return cont(statement)
+      } else if (isTS && (value == "module" || value == "enum" || value == "type") && cx.stream.match(/^\s*\w/, false)) {
+        cx.marked = "keyword";
+        if (value == "enum") return cont(enumdef);
+        else if (value == "type") return cont(typename, expect("operator"), typeexpr, expect(";"));
+        else return cont(pushlex("form"), pattern, expect("{"), pushlex("}"), block, poplex, poplex)
+      } else if (isTS && value == "namespace") {
+        cx.marked = "keyword";
+        return cont(pushlex("form"), expression, statement, poplex)
+      } else if (isTS && value == "abstract") {
+        cx.marked = "keyword";
+        return cont(statement)
+      } else {
+        return cont(pushlex("stat"), maybelabel);
+      }
+    }
+    if (type == "switch") return cont(pushlex("form"), parenExpr, expect("{"), pushlex("}", "switch"), pushblockcontext,
+                                      block, poplex, poplex, popcontext);
+    if (type == "case") return cont(expression, expect(":"));
+    if (type == "default") return cont(expect(":"));
+    if (type == "catch") return cont(pushlex("form"), pushcontext, maybeCatchBinding, statement, poplex, popcontext);
+    if (type == "export") return cont(pushlex("stat"), afterExport, poplex);
+    if (type == "import") return cont(pushlex("stat"), afterImport, poplex);
+    if (type == "async") return cont(statement)
+    if (value == "@") return cont(expression, statement)
+    return pass(pushlex("stat"), expression, expect(";"), poplex);
+  }
+  function maybeCatchBinding(type) {
+    if (type == "(") return cont(funarg, expect(")"))
+  }
+  function expression(type, value) {
+    return expressionInner(type, value, false);
+  }
+  function expressionNoComma(type, value) {
+    return expressionInner(type, value, true);
+  }
+  function parenExpr(type) {
+    if (type != "(") return pass()
+    return cont(pushlex(")"), maybeexpression, expect(")"), poplex)
+  }
+  function expressionInner(type, value, noComma) {
+    if (cx.state.fatArrowAt == cx.stream.start) {
+      var body = noComma ? arrowBodyNoComma : arrowBody;
+      if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, expect("=>"), body, popcontext);
+      else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
+    }
+
+    var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
+    if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
+    if (type == "function") return cont(functiondef, maybeop);
+    if (type == "class" || (isTS && value == "interface")) { cx.marked = "keyword"; return cont(pushlex("form"), classExpression, poplex); }
+    if (type == "keyword c" || type == "async") return cont(noComma ? expressionNoComma : expression);
+    if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
+    if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
+    if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
+    if (type == "{") return contCommasep(objprop, "}", null, maybeop);
+    if (type == "quasi") return pass(quasi, maybeop);
+    if (type == "new") return cont(maybeTarget(noComma));
+    return cont();
+  }
+  function maybeexpression(type) {
+    if (type.match(/[;\}\)\],]/)) return pass();
+    return pass(expression);
+  }
+
+  function maybeoperatorComma(type, value) {
+    if (type == ",") return cont(maybeexpression);
+    return maybeoperatorNoComma(type, value, false);
+  }
+  function maybeoperatorNoComma(type, value, noComma) {
+    var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
+    var expr = noComma == false ? expression : expressionNoComma;
+    if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
+    if (type == "operator") {
+      if (/\+\+|--/.test(value) || isTS && value == "!") return cont(me);
+      if (isTS && value == "<" && cx.stream.match(/^([^<>]|<[^<>]*>)*>\s*\(/, false))
+        return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, me);
+      if (value == "?") return cont(expression, expect(":"), expr);
+      return cont(expr);
+    }
+    if (type == "quasi") { return pass(quasi, me); }
+    if (type == ";") return;
+    if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
+    if (type == ".") return cont(property, me);
+    if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
+    if (isTS && value == "as") { cx.marked = "keyword"; return cont(typeexpr, me) }
+    if (type == "regexp") {
+      cx.state.lastType = cx.marked = "operator";
+      cx.stream.backUp(cx.stream.pos - cx.stream.start - 1);
+      return cont(expr)
+    }
+  }
+  function quasi(type, value) {
+    if (type != "quasi") return pass();
+    if (value.slice(value.length - 2) != "${") return cont(quasi);
+    return cont(maybeexpression, continueQuasi);
+  }
+  function continueQuasi(type) {
+    if (type == "}") {
+      cx.marked = "string-2";
+      cx.state.tokenize = tokenQuasi;
+      return cont(quasi);
+    }
+  }
+  function arrowBody(type) {
+    findFatArrow(cx.stream, cx.state);
+    return pass(type == "{" ? statement : expression);
+  }
+  function arrowBodyNoComma(type) {
+    findFatArrow(cx.stream, cx.state);
+    return pass(type == "{" ? statement : expressionNoComma);
+  }
+  function maybeTarget(noComma) {
+    return function(type) {
+      if (type == ".") return cont(noComma ? targetNoComma : target);
+      else if (type == "variable" && isTS) return cont(maybeTypeArgs, noComma ? maybeoperatorNoComma : maybeoperatorComma)
+      else return pass(noComma ? expressionNoComma : expression);
+    };
+  }
+  function target(_, value) {
+    if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorComma); }
+  }
+  function targetNoComma(_, value) {
+    if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorNoComma); }
+  }
+  function maybelabel(type) {
+    if (type == ":") return cont(poplex, statement);
+    return pass(maybeoperatorComma, expect(";"), poplex);
+  }
+  function property(type) {
+    if (type == "variable") {cx.marked = "property"; return cont();}
+  }
+  function objprop(type, value) {
+    if (type == "async") {
+      cx.marked = "property";
+      return cont(objprop);
+    } else if (type == "variable" || cx.style == "keyword") {
+      cx.marked = "property";
+      if (value == "get" || value == "set") return cont(getterSetter);
+      var m; // Work around fat-arrow-detection complication for detecting typescript typed arrow params
+      if (isTS && cx.state.fatArrowAt == cx.stream.start && (m = cx.stream.match(/^\s*:\s*/, false)))
+        cx.state.fatArrowAt = cx.stream.pos + m[0].length;
+      return cont(afterprop);
+    } else if (type == "number" || type == "string") {
+      cx.marked = jsonldMode ? "property" : (cx.style + " property");
+      return cont(afterprop);
+    } else if (type == "jsonld-keyword") {
+      return cont(afterprop);
+    } else if (isTS && isModifier(value)) {
+      cx.marked = "keyword";
+      return cont(objprop)
+    } else if (type == "[") {
+      return cont(expression, maybetype, expect("]"), afterprop);
+    } else if (type == "spread") {
+      return cont(expressionNoComma, afterprop);
+    } else if (value == "*") {
+      cx.marked = "keyword";
+      return cont(objprop);
+    } else if (type == ":") {
+      return pass(afterprop)
+    }
+  }
+  function getterSetter(type) {
+    if (type != "variable") return pass(afterprop);
+    cx.marked = "property";
+    return cont(functiondef);
+  }
+  function afterprop(type) {
+    if (type == ":") return cont(expressionNoComma);
+    if (type == "(") return pass(functiondef);
+  }
+  function commasep(what, end, sep) {
+    function proceed(type, value) {
+      if (sep ? sep.indexOf(type) > -1 : type == ",") {
+        var lex = cx.state.lexical;
+        if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
+        return cont(function(type, value) {
+          if (type == end || value == end) return pass()
+          return pass(what)
+        }, proceed);
+      }
+      if (type == end || value == end) return cont();
+      if (sep && sep.indexOf(";") > -1) return pass(what)
+      return cont(expect(end));
+    }
+    return function(type, value) {
+      if (type == end || value == end) return cont();
+      return pass(what, proceed);
+    };
+  }
+  function contCommasep(what, end, info) {
+    for (var i = 3; i < arguments.length; i++)
+      cx.cc.push(arguments[i]);
+    return cont(pushlex(end, info), commasep(what, end), poplex);
+  }
+  function block(type) {
+    if (type == "}") return cont();
+    return pass(statement, block);
+  }
+  function maybetype(type, value) {
+    if (isTS) {
+      if (type == ":") return cont(typeexpr);
+      if (value == "?") return cont(maybetype);
+    }
+  }
+  function maybetypeOrIn(type, value) {
+    if (isTS && (type == ":" || value == "in")) return cont(typeexpr)
+  }
+  function mayberettype(type) {
+    if (isTS && type == ":") {
+      if (cx.stream.match(/^\s*\w+\s+is\b/, false)) return cont(expression, isKW, typeexpr)
+      else return cont(typeexpr)
+    }
+  }
+  function isKW(_, value) {
+    if (value == "is") {
+      cx.marked = "keyword";
+      return cont()
+    }
+  }
+  function typeexpr(type, value) {
+    if (value == "keyof" || value == "typeof" || value == "infer" || value == "readonly") {
+      cx.marked = "keyword";
+      return cont(value == "typeof" ? expressionNoComma : typeexpr)
+    }
+    if (type == "variable" || value == "void") {
+      cx.marked = "type";
+      return cont(afterType)
+    }
+    if (value == "|" || value == "&") return cont(typeexpr)
+    if (type == "string" || type == "number" || type == "atom") return cont(afterType);
+    if (type == "[") return cont(pushlex("]"), commasep(typeexpr, "]", ","), poplex, afterType)
+    if (type == "{") return cont(pushlex("}"), typeprops, poplex, afterType)
+    if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType, afterType)
+    if (type == "<") return cont(commasep(typeexpr, ">"), typeexpr)
+    if (type == "quasi") { return pass(quasiType, afterType); }
+  }
+  function maybeReturnType(type) {
+    if (type == "=>") return cont(typeexpr)
+  }
+  function typeprops(type) {
+    if (type.match(/[\}\)\]]/)) return cont()
+    if (type == "," || type == ";") return cont(typeprops)
+    return pass(typeprop, typeprops)
+  }
+  function typeprop(type, value) {
+    if (type == "variable" || cx.style == "keyword") {
+      cx.marked = "property";
+      return cont(typeprop)
+    } else if (value == "?" || type == "number" || type == "string") {
+      return cont(typeprop)
+    } else if (type == ":") {
+      return cont(typeexpr)
+    } else if (type == "[") {
+      return cont(expect("variable"), maybetypeOrIn, expect("]"), typeprop)
+    } else if (type == "(") {
+      return pass(functiondecl, typeprop)
+    } else if (!type.match(/[;\}\)\],]/)) {
+      return cont()
+    }
+  }
+  function quasiType(type, value) {
+    if (type != "quasi") return pass();
+    if (value.slice(value.length - 2) != "${") return cont(quasiType);
+    return cont(typeexpr, continueQuasiType);
+  }
+  function continueQuasiType(type) {
+    if (type == "}") {
+      cx.marked = "string-2";
+      cx.state.tokenize = tokenQuasi;
+      return cont(quasiType);
+    }
+  }
+  function typearg(type, value) {
+    if (type == "variable" && cx.stream.match(/^\s*[?:]/, false) || value == "?") return cont(typearg)
+    if (type == ":") return cont(typeexpr)
+    if (type == "spread") return cont(typearg)
+    return pass(typeexpr)
+  }
+  function afterType(type, value) {
+    if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
+    if (value == "|" || type == "." || value == "&") return cont(typeexpr)
+    if (type == "[") return cont(typeexpr, expect("]"), afterType)
+    if (value == "extends" || value == "implements") { cx.marked = "keyword"; return cont(typeexpr) }
+    if (value == "?") return cont(typeexpr, expect(":"), typeexpr)
+  }
+  function maybeTypeArgs(_, value) {
+    if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
+  }
+  function typeparam() {
+    return pass(typeexpr, maybeTypeDefault)
+  }
+  function maybeTypeDefault(_, value) {
+    if (value == "=") return cont(typeexpr)
+  }
+  function vardef(_, value) {
+    if (value == "enum") {cx.marked = "keyword"; return cont(enumdef)}
+    return pass(pattern, maybetype, maybeAssign, vardefCont);
+  }
+  function pattern(type, value) {
+    if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(pattern) }
+    if (type == "variable") { register(value); return cont(); }
+    if (type == "spread") return cont(pattern);
+    if (type == "[") return contCommasep(eltpattern, "]");
+    if (type == "{") return contCommasep(proppattern, "}");
+  }
+  function proppattern(type, value) {
+    if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
+      register(value);
+      return cont(maybeAssign);
+    }
+    if (type == "variable") cx.marked = "property";
+    if (type == "spread") return cont(pattern);
+    if (type == "}") return pass();
+    if (type == "[") return cont(expression, expect(']'), expect(':'), proppattern);
+    return cont(expect(":"), pattern, maybeAssign);
+  }
+  function eltpattern() {
+    return pass(pattern, maybeAssign)
+  }
+  function maybeAssign(_type, value) {
+    if (value == "=") return cont(expressionNoComma);
+  }
+  function vardefCont(type) {
+    if (type == ",") return cont(vardef);
+  }
+  function maybeelse(type, value) {
+    if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
+  }
+  function forspec(type, value) {
+    if (value == "await") return cont(forspec);
+    if (type == "(") return cont(pushlex(")"), forspec1, poplex);
+  }
+  function forspec1(type) {
+    if (type == "var") return cont(vardef, forspec2);
+    if (type == "variable") return cont(forspec2);
+    return pass(forspec2)
+  }
+  function forspec2(type, value) {
+    if (type == ")") return cont()
+    if (type == ";") return cont(forspec2)
+    if (value == "in" || value == "of") { cx.marked = "keyword"; return cont(expression, forspec2) }
+    return pass(expression, forspec2)
+  }
+  function functiondef(type, value) {
+    if (value == "*") {cx.marked = "keyword"; return cont(functiondef);}
+    if (type == "variable") {register(value); return cont(functiondef);}
+    if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, statement, popcontext);
+    if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondef)
+  }
+  function functiondecl(type, value) {
+    if (value == "*") {cx.marked = "keyword"; return cont(functiondecl);}
+    if (type == "variable") {register(value); return cont(functiondecl);}
+    if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, popcontext);
+    if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondecl)
+  }
+  function typename(type, value) {
+    if (type == "keyword" || type == "variable") {
+      cx.marked = "type";
+      return cont(typename)
+    } else if (value == "<") {
+      return cont(pushlex(">"), commasep(typeparam, ">"), poplex)
+    }
+  }
+  function funarg(type, value) {
+    if (value == "@") cont(expression, funarg);
+    if (type == "spread") return cont(funarg);
+    if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(funarg); }
+    if (isTS && type == "this") return cont(maybetype, maybeAssign)
+    return pass(pattern, maybetype, maybeAssign);
+  }
+  function classExpression(type, value) {
+    // Class expressions may have an optional name.
+    if (type == "variable") return className(type, value);
+    return classNameAfter(type, value);
+  }
+  function className(type, value) {
+    if (type == "variable") {register(value); return cont(classNameAfter);}
+  }
+  function classNameAfter(type, value) {
+    if (value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, classNameAfter)
+    if (value == "extends" || value == "implements" || (isTS && type == ",")) {
+      if (value == "implements") cx.marked = "keyword";
+      return cont(isTS ? typeexpr : expression, classNameAfter);
+    }
+    if (type == "{") return cont(pushlex("}"), classBody, poplex);
+  }
+  function classBody(type, value) {
+    if (type == "async" ||
+        (type == "variable" &&
+         (value == "static" || value == "get" || value == "set" || (isTS && isModifier(value))) &&
+         cx.stream.match(/^\s+[\w$\xa1-\uffff]/, false))) {
+      cx.marked = "keyword";
+      return cont(classBody);
+    }
+    if (type == "variable" || cx.style == "keyword") {
+      cx.marked = "property";
+      return cont(classfield, classBody);
+    }
+    if (type == "number" || type == "string") return cont(classfield, classBody);
+    if (type == "[")
+      return cont(expression, maybetype, expect("]"), classfield, classBody)
+    if (value == "*") {
+      cx.marked = "keyword";
+      return cont(classBody);
+    }
+    if (isTS && type == "(") return pass(functiondecl, classBody)
+    if (type == ";" || type == ",") return cont(classBody);
+    if (type == "}") return cont();
+    if (value == "@") return cont(expression, classBody)
+  }
+  function classfield(type, value) {
+    if (value == "!") return cont(classfield)
+    if (value == "?") return cont(classfield)
+    if (type == ":") return cont(typeexpr, maybeAssign)
+    if (value == "=") return cont(expressionNoComma)
+    var context = cx.state.lexical.prev, isInterface = context && context.info == "interface";
+    return pass(isInterface ? functiondecl : functiondef)
+  }
+  function afterExport(type, value) {
+    if (value == "*") { cx.marked = "keyword"; return cont(maybeFrom, expect(";")); }
+    if (value == "default") { cx.marked = "keyword"; return cont(expression, expect(";")); }
+    if (type == "{") return cont(commasep(exportField, "}"), maybeFrom, expect(";"));
+    return pass(statement);
+  }
+  function exportField(type, value) {
+    if (value == "as") { cx.marked = "keyword"; return cont(expect("variable")); }
+    if (type == "variable") return pass(expressionNoComma, exportField);
+  }
+  function afterImport(type) {
+    if (type == "string") return cont();
+    if (type == "(") return pass(expression);
+    if (type == ".") return pass(maybeoperatorComma);
+    return pass(importSpec, maybeMoreImports, maybeFrom);
+  }
+  function importSpec(type, value) {
+    if (type == "{") return contCommasep(importSpec, "}");
+    if (type == "variable") register(value);
+    if (value == "*") cx.marked = "keyword";
+    return cont(maybeAs);
+  }
+  function maybeMoreImports(type) {
+    if (type == ",") return cont(importSpec, maybeMoreImports)
+  }
+  function maybeAs(_type, value) {
+    if (value == "as") { cx.marked = "keyword"; return cont(importSpec); }
+  }
+  function maybeFrom(_type, value) {
+    if (value == "from") { cx.marked = "keyword"; return cont(expression); }
+  }
+  function arrayLiteral(type) {
+    if (type == "]") return cont();
+    return pass(commasep(expressionNoComma, "]"));
+  }
+  function enumdef() {
+    return pass(pushlex("form"), pattern, expect("{"), pushlex("}"), commasep(enummember, "}"), poplex, poplex)
+  }
+  function enummember() {
+    return pass(pattern, maybeAssign);
+  }
+
+  function isContinuedStatement(state, textAfter) {
+    return state.lastType == "operator" || state.lastType == "," ||
+      isOperatorChar.test(textAfter.charAt(0)) ||
+      /[,.]/.test(textAfter.charAt(0));
+  }
+
+  function expressionAllowed(stream, state, backUp) {
+    return state.tokenize == tokenBase &&
+      /^(?:operator|sof|keyword [bcd]|case|new|export|default|spread|[\[{}\(,;:]|=>)$/.test(state.lastType) ||
+      (state.lastType == "quasi" && /\{\s*$/.test(stream.string.slice(0, stream.pos - (backUp || 0))))
+  }
+
+  // Interface
+
+  return {
+    startState: function(basecolumn) {
+      var state = {
+        tokenize: tokenBase,
+        lastType: "sof",
+        cc: [],
+        lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
+        localVars: parserConfig.localVars,
+        context: parserConfig.localVars && new Context(null, null, false),
+        indented: basecolumn || 0
+      };
+      if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
+        state.globalVars = parserConfig.globalVars;
+      return state;
+    },
+
+    token: function(stream, state) {
+      if (stream.sol()) {
+        if (!state.lexical.hasOwnProperty("align"))
+          state.lexical.align = false;
+        state.indented = stream.indentation();
+        findFatArrow(stream, state);
+      }
+      if (state.tokenize != tokenComment && stream.eatSpace()) return null;
+      var style = state.tokenize(stream, state);
+      if (type == "comment") return style;
+      state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
+      return parseJS(state, style, type, content, stream);
+    },
+
+    indent: function(state, textAfter) {
+      if (state.tokenize == tokenComment || state.tokenize == tokenQuasi) return CodeMirror.Pass;
+      if (state.tokenize != tokenBase) return 0;
+      var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical, top;
+      // Kludge to prevent 'maybelse' from blocking lexical scope pops
+      if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
+        var c = state.cc[i];
+        if (c == poplex) lexical = lexical.prev;
+        else if (c != maybeelse && c != popcontext) break;
+      }
+      while ((lexical.type == "stat" || lexical.type == "form") &&
+             (firstChar == "}" || ((top = state.cc[state.cc.length - 1]) &&
+                                   (top == maybeoperatorComma || top == maybeoperatorNoComma) &&
+                                   !/^[,\.=+\-*:?[\(]/.test(textAfter))))
+        lexical = lexical.prev;
+      if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
+        lexical = lexical.prev;
+      var type = lexical.type, closing = firstChar == type;
+
+      if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info.length + 1 : 0);
+      else if (type == "form" && firstChar == "{") return lexical.indented;
+      else if (type == "form") return lexical.indented + indentUnit;
+      else if (type == "stat")
+        return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
+      else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
+        return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
+      else if (lexical.align) return lexical.column + (closing ? 0 : 1);
+      else return lexical.indented + (closing ? 0 : indentUnit);
+    },
+
+    electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
+    blockCommentStart: jsonMode ? null : "/*",
+    blockCommentEnd: jsonMode ? null : "*/",
+    blockCommentContinue: jsonMode ? null : " * ",
+    lineComment: jsonMode ? null : "//",
+    fold: "brace",
+    closeBrackets: "()[]{}''\"\"``",
+
+    helperType: jsonMode ? "json" : "javascript",
+    jsonldMode: jsonldMode,
+    jsonMode: jsonMode,
+
+    expressionAllowed: expressionAllowed,
+
+    skipExpression: function(state) {
+      parseJS(state, "atom", "atom", "true", new CodeMirror.StringStream("", 2, null));
+    }
+  };
+});
+
+CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);
+
+CodeMirror.defineMIME("text/javascript", "javascript");
+CodeMirror.defineMIME("text/ecmascript", "javascript");
+CodeMirror.defineMIME("application/javascript", "javascript");
+CodeMirror.defineMIME("application/x-javascript", "javascript");
+CodeMirror.defineMIME("application/ecmascript", "javascript");
+CodeMirror.defineMIME("application/json", { name: "javascript", json: true });
+CodeMirror.defineMIME("application/x-json", { name: "javascript", json: true });
+CodeMirror.defineMIME("application/manifest+json", { name: "javascript", json: true });
+CodeMirror.defineMIME("application/ld+json", { name: "javascript", jsonld: true });
+CodeMirror.defineMIME("text/typescript", { name: "javascript", typescript: true });
+CodeMirror.defineMIME("application/typescript", { name: "javascript", typescript: true });
+
+});
+});
+
+export default javascript;
diff --git a/docs/_snowpack/pkg/codemirror/mode/pegjs/pegjs.js b/docs/_snowpack/pkg/codemirror/mode/pegjs/pegjs.js
new file mode 100644
index 00000000..1d55e7d9
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/mode/pegjs/pegjs.js
@@ -0,0 +1,115 @@
+import { c as createCommonjsModule } from '../../../common/_commonjsHelpers-8c19dec8.js';
+import { c as codemirror } from '../../../common/codemirror-d650d44d.js';
+import javascript from '../javascript/javascript.js';
+
+var pegjs = createCommonjsModule(function (module, exports) {
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: https://codemirror.net/LICENSE
+
+(function(mod) {
+  mod(codemirror, javascript);
+})(function(CodeMirror) {
+
+CodeMirror.defineMode("pegjs", function (config) {
+  var jsMode = CodeMirror.getMode(config, "javascript");
+
+  function identifier(stream) {
+    return stream.match(/^[a-zA-Z_][a-zA-Z0-9_]*/);
+  }
+
+  return {
+    startState: function () {
+      return {
+        inString: false,
+        stringType: null,
+        inComment: false,
+        inCharacterClass: false,
+        braced: 0,
+        lhs: true,
+        localState: null
+      };
+    },
+    token: function (stream, state) {
+      if (stream)
+
+      //check for state changes
+      if (!state.inString && !state.inComment && ((stream.peek() == '"') || (stream.peek() == "'"))) {
+        state.stringType = stream.peek();
+        stream.next(); // Skip quote
+        state.inString = true; // Update state
+      }
+      if (!state.inString && !state.inComment && stream.match('/*')) {
+        state.inComment = true;
+      }
+
+      //return state
+      if (state.inString) {
+        while (state.inString && !stream.eol()) {
+          if (stream.peek() === state.stringType) {
+            stream.next(); // Skip quote
+            state.inString = false; // Clear flag
+          } else if (stream.peek() === '\\') {
+            stream.next();
+            stream.next();
+          } else {
+            stream.match(/^.[^\\\"\']*/);
+          }
+        }
+        return state.lhs ? "property string" : "string"; // Token style
+      } else if (state.inComment) {
+        while (state.inComment && !stream.eol()) {
+          if (stream.match('*/')) {
+            state.inComment = false; // Clear flag
+          } else {
+            stream.match(/^.[^\*]*/);
+          }
+        }
+        return "comment";
+      } else if (state.inCharacterClass) {
+          while (state.inCharacterClass && !stream.eol()) {
+            if (!(stream.match(/^[^\]\\]+/) || stream.match(/^\\./))) {
+              state.inCharacterClass = false;
+            }
+          }
+      } else if (stream.peek() === '[') {
+        stream.next();
+        state.inCharacterClass = true;
+        return 'bracket';
+      } else if (stream.match('//')) {
+        stream.skipToEnd();
+        return "comment";
+      } else if (state.braced || stream.peek() === '{') {
+        if (state.localState === null) {
+          state.localState = CodeMirror.startState(jsMode);
+        }
+        var token = jsMode.token(stream, state.localState);
+        var text = stream.current();
+        if (!token) {
+          for (var i = 0; i < text.length; i++) {
+            if (text[i] === '{') {
+              state.braced++;
+            } else if (text[i] === '}') {
+              state.braced--;
+            }
+          }        }
+        return token;
+      } else if (identifier(stream)) {
+        if (stream.peek() === ':') {
+          return 'variable';
+        }
+        return 'variable-2';
+      } else if (['[', ']', '(', ')'].indexOf(stream.peek()) != -1) {
+        stream.next();
+        return 'bracket';
+      } else if (!stream.eatSpace()) {
+        stream.next();
+      }
+      return null;
+    }
+  };
+}, "javascript");
+
+});
+});
+
+export default pegjs;
diff --git a/docs/_snowpack/pkg/codemirror/theme/material.css b/docs/_snowpack/pkg/codemirror/theme/material.css
new file mode 100644
index 00000000..a7848499
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/theme/material.css
@@ -0,0 +1,141 @@
+/*
+  Name:       material
+  Author:     Mattia Astorino (http://github.com/equinusocio)
+  Website:    https://material-theme.site/
+*/
+
+.cm-s-material.CodeMirror {
+  background-color: #263238;
+  color: #EEFFFF;
+}
+
+.cm-s-material .CodeMirror-gutters {
+  background: #263238;
+  color: #546E7A;
+  border: none;
+}
+
+.cm-s-material .CodeMirror-guttermarker,
+.cm-s-material .CodeMirror-guttermarker-subtle,
+.cm-s-material .CodeMirror-linenumber {
+  color: #546E7A;
+}
+
+.cm-s-material .CodeMirror-cursor {
+  border-left: 1px solid #FFCC00;
+}
+.cm-s-material.cm-fat-cursor .CodeMirror-cursor {
+  background-color: #5d6d5c80 !important;
+}
+.cm-s-material .cm-animate-fat-cursor {
+  background-color: #5d6d5c80 !important;
+}
+
+.cm-s-material div.CodeMirror-selected {
+  background: rgba(128, 203, 196, 0.2);
+}
+
+.cm-s-material.CodeMirror-focused div.CodeMirror-selected {
+  background: rgba(128, 203, 196, 0.2);
+}
+
+.cm-s-material .CodeMirror-line::selection,
+.cm-s-material .CodeMirror-line>span::selection,
+.cm-s-material .CodeMirror-line>span>span::selection {
+  background: rgba(128, 203, 196, 0.2);
+}
+
+.cm-s-material .CodeMirror-line::-moz-selection,
+.cm-s-material .CodeMirror-line>span::-moz-selection,
+.cm-s-material .CodeMirror-line>span>span::-moz-selection {
+  background: rgba(128, 203, 196, 0.2);
+}
+
+.cm-s-material .CodeMirror-activeline-background {
+  background: rgba(0, 0, 0, 0.5);
+}
+
+.cm-s-material .cm-keyword {
+  color: #C792EA;
+}
+
+.cm-s-material .cm-operator {
+  color: #89DDFF;
+}
+
+.cm-s-material .cm-variable-2 {
+  color: #EEFFFF;
+}
+
+.cm-s-material .cm-variable-3,
+.cm-s-material .cm-type {
+  color: #f07178;
+}
+
+.cm-s-material .cm-builtin {
+  color: #FFCB6B;
+}
+
+.cm-s-material .cm-atom {
+  color: #F78C6C;
+}
+
+.cm-s-material .cm-number {
+  color: #FF5370;
+}
+
+.cm-s-material .cm-def {
+  color: #82AAFF;
+}
+
+.cm-s-material .cm-string {
+  color: #C3E88D;
+}
+
+.cm-s-material .cm-string-2 {
+  color: #f07178;
+}
+
+.cm-s-material .cm-comment {
+  color: #546E7A;
+}
+
+.cm-s-material .cm-variable {
+  color: #f07178;
+}
+
+.cm-s-material .cm-tag {
+  color: #FF5370;
+}
+
+.cm-s-material .cm-meta {
+  color: #FFCB6B;
+}
+
+.cm-s-material .cm-attribute {
+  color: #C792EA;
+}
+
+.cm-s-material .cm-property {
+  color: #C792EA;
+}
+
+.cm-s-material .cm-qualifier {
+  color: #DECB6B;
+}
+
+.cm-s-material .cm-variable-3,
+.cm-s-material .cm-type {
+  color: #DECB6B;
+}
+
+
+.cm-s-material .cm-error {
+  color: rgba(255, 255, 255, 1.0);
+  background-color: #FF5370;
+}
+
+.cm-s-material .CodeMirror-matchingbracket {
+  text-decoration: underline;
+  color: white !important;
+}
diff --git a/docs/_snowpack/pkg/codemirror/theme/material.css.proxy.js b/docs/_snowpack/pkg/codemirror/theme/material.css.proxy.js
new file mode 100644
index 00000000..1b1356aa
--- /dev/null
+++ b/docs/_snowpack/pkg/codemirror/theme/material.css.proxy.js
@@ -0,0 +1,10 @@
+// [snowpack] add styles to the page (skip if no document exists)
+if (typeof document !== 'undefined') {
+  const code = "/*\n  Name:       material\n  Author:     Mattia Astorino (http://github.com/equinusocio)\n  Website:    https://material-theme.site/\n*/\n\n.cm-s-material.CodeMirror {\n  background-color: #263238;\n  color: #EEFFFF;\n}\n\n.cm-s-material .CodeMirror-gutters {\n  background: #263238;\n  color: #546E7A;\n  border: none;\n}\n\n.cm-s-material .CodeMirror-guttermarker,\n.cm-s-material .CodeMirror-guttermarker-subtle,\n.cm-s-material .CodeMirror-linenumber {\n  color: #546E7A;\n}\n\n.cm-s-material .CodeMirror-cursor {\n  border-left: 1px solid #FFCC00;\n}\n.cm-s-material.cm-fat-cursor .CodeMirror-cursor {\n  background-color: #5d6d5c80 !important;\n}\n.cm-s-material .cm-animate-fat-cursor {\n  background-color: #5d6d5c80 !important;\n}\n\n.cm-s-material div.CodeMirror-selected {\n  background: rgba(128, 203, 196, 0.2);\n}\n\n.cm-s-material.CodeMirror-focused div.CodeMirror-selected {\n  background: rgba(128, 203, 196, 0.2);\n}\n\n.cm-s-material .CodeMirror-line::selection,\n.cm-s-material .CodeMirror-line>span::selection,\n.cm-s-material .CodeMirror-line>span>span::selection {\n  background: rgba(128, 203, 196, 0.2);\n}\n\n.cm-s-material .CodeMirror-line::-moz-selection,\n.cm-s-material .CodeMirror-line>span::-moz-selection,\n.cm-s-material .CodeMirror-line>span>span::-moz-selection {\n  background: rgba(128, 203, 196, 0.2);\n}\n\n.cm-s-material .CodeMirror-activeline-background {\n  background: rgba(0, 0, 0, 0.5);\n}\n\n.cm-s-material .cm-keyword {\n  color: #C792EA;\n}\n\n.cm-s-material .cm-operator {\n  color: #89DDFF;\n}\n\n.cm-s-material .cm-variable-2 {\n  color: #EEFFFF;\n}\n\n.cm-s-material .cm-variable-3,\n.cm-s-material .cm-type {\n  color: #f07178;\n}\n\n.cm-s-material .cm-builtin {\n  color: #FFCB6B;\n}\n\n.cm-s-material .cm-atom {\n  color: #F78C6C;\n}\n\n.cm-s-material .cm-number {\n  color: #FF5370;\n}\n\n.cm-s-material .cm-def {\n  color: #82AAFF;\n}\n\n.cm-s-material .cm-string {\n  color: #C3E88D;\n}\n\n.cm-s-material .cm-string-2 {\n  color: #f07178;\n}\n\n.cm-s-material .cm-comment {\n  color: #546E7A;\n}\n\n.cm-s-material .cm-variable {\n  color: #f07178;\n}\n\n.cm-s-material .cm-tag {\n  color: #FF5370;\n}\n\n.cm-s-material .cm-meta {\n  color: #FFCB6B;\n}\n\n.cm-s-material .cm-attribute {\n  color: #C792EA;\n}\n\n.cm-s-material .cm-property {\n  color: #C792EA;\n}\n\n.cm-s-material .cm-qualifier {\n  color: #DECB6B;\n}\n\n.cm-s-material .cm-variable-3,\n.cm-s-material .cm-type {\n  color: #DECB6B;\n}\n\n\n.cm-s-material .cm-error {\n  color: rgba(255, 255, 255, 1.0);\n  background-color: #FF5370;\n}\n\n.cm-s-material .CodeMirror-matchingbracket {\n  text-decoration: underline;\n  color: white !important;\n}\n";
+
+  const styleEl = document.createElement("style");
+  const codeEl = document.createTextNode(code);
+  styleEl.type = 'text/css';
+  styleEl.appendChild(codeEl);
+  document.head.appendChild(styleEl);
+}
\ No newline at end of file
diff --git a/docs/_snowpack/pkg/common/_commonjsHelpers-913f9c4a.js b/docs/_snowpack/pkg/common/_commonjsHelpers-8c19dec8.js
similarity index 66%
rename from docs/_snowpack/pkg/common/_commonjsHelpers-913f9c4a.js
rename to docs/_snowpack/pkg/common/_commonjsHelpers-8c19dec8.js
index 673e6be4..e88d96fb 100644
--- a/docs/_snowpack/pkg/common/_commonjsHelpers-913f9c4a.js
+++ b/docs/_snowpack/pkg/common/_commonjsHelpers-8c19dec8.js
@@ -1,3 +1,5 @@
+var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
+
 function getDefaultExportFromCjs (x) {
 	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
 }
@@ -16,4 +18,4 @@ function commonjsRequire () {
 	throw new Error('Dynamic requires are not currently supported by @rollup/plugin-commonjs');
 }
 
-export { createCommonjsModule as c, getDefaultExportFromCjs as g };
+export { commonjsGlobal as a, createCommonjsModule as c, getDefaultExportFromCjs as g };
diff --git a/docs/_snowpack/pkg/common/codemirror-d650d44d.js b/docs/_snowpack/pkg/common/codemirror-d650d44d.js
new file mode 100644
index 00000000..36851ad2
--- /dev/null
+++ b/docs/_snowpack/pkg/common/codemirror-d650d44d.js
@@ -0,0 +1,9852 @@
+import { c as createCommonjsModule, a as commonjsGlobal } from './_commonjsHelpers-8c19dec8.js';
+
+var codemirror = createCommonjsModule(function (module, exports) {
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: https://codemirror.net/LICENSE
+
+// This is CodeMirror (https://codemirror.net), a code editor
+// implemented in JavaScript on top of the browser's DOM.
+//
+// You can find some technical background for some of the code below
+// at http://marijnhaverbeke.nl/blog/#cm-internals .
+
+(function (global, factory) {
+   module.exports = factory() ;
+}(commonjsGlobal, (function () {
+  // Kludges for bugs and behavior differences that can't be feature
+  // detected are enabled based on userAgent etc sniffing.
+  var userAgent = navigator.userAgent;
+  var platform = navigator.platform;
+
+  var gecko = /gecko\/\d/i.test(userAgent);
+  var ie_upto10 = /MSIE \d/.test(userAgent);
+  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
+  var edge = /Edge\/(\d+)/.exec(userAgent);
+  var ie = ie_upto10 || ie_11up || edge;
+  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
+  var webkit = !edge && /WebKit\//.test(userAgent);
+  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
+  var chrome = !edge && /Chrome\//.test(userAgent);
+  var presto = /Opera\//.test(userAgent);
+  var safari = /Apple Computer/.test(navigator.vendor);
+  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
+  var phantom = /PhantomJS/.test(userAgent);
+
+  var ios = safari && (/Mobile\/\w+/.test(userAgent) || navigator.maxTouchPoints > 2);
+  var android = /Android/.test(userAgent);
+  // This is woefully incomplete. Suggestions for alternative methods welcome.
+  var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
+  var mac = ios || /Mac/.test(platform);
+  var chromeOS = /\bCrOS\b/.test(userAgent);
+  var windows = /win/i.test(platform);
+
+  var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
+  if (presto_version) { presto_version = Number(presto_version[1]); }
+  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
+  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
+  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
+  var captureRightClick = gecko || (ie && ie_version >= 9);
+
+  function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }
+
+  var rmClass = function(node, cls) {
+    var current = node.className;
+    var match = classTest(cls).exec(current);
+    if (match) {
+      var after = current.slice(match.index + match[0].length);
+      node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
+    }
+  };
+
+  function removeChildren(e) {
+    for (var count = e.childNodes.length; count > 0; --count)
+      { e.removeChild(e.firstChild); }
+    return e
+  }
+
+  function removeChildrenAndAdd(parent, e) {
+    return removeChildren(parent).appendChild(e)
+  }
+
+  function elt(tag, content, className, style) {
+    var e = document.createElement(tag);
+    if (className) { e.className = className; }
+    if (style) { e.style.cssText = style; }
+    if (typeof content == "string") { e.appendChild(document.createTextNode(content)); }
+    else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }
+    return e
+  }
+  // wrapper for elt, which removes the elt from the accessibility tree
+  function eltP(tag, content, className, style) {
+    var e = elt(tag, content, className, style);
+    e.setAttribute("role", "presentation");
+    return e
+  }
+
+  var range;
+  if (document.createRange) { range = function(node, start, end, endNode) {
+    var r = document.createRange();
+    r.setEnd(endNode || node, end);
+    r.setStart(node, start);
+    return r
+  }; }
+  else { range = function(node, start, end) {
+    var r = document.body.createTextRange();
+    try { r.moveToElementText(node.parentNode); }
+    catch(e) { return r }
+    r.collapse(true);
+    r.moveEnd("character", end);
+    r.moveStart("character", start);
+    return r
+  }; }
+
+  function contains(parent, child) {
+    if (child.nodeType == 3) // Android browser always returns false when child is a textnode
+      { child = child.parentNode; }
+    if (parent.contains)
+      { return parent.contains(child) }
+    do {
+      if (child.nodeType == 11) { child = child.host; }
+      if (child == parent) { return true }
+    } while (child = child.parentNode)
+  }
+
+  function activeElt() {
+    // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
+    // IE < 10 will throw when accessed while the page is loading or in an iframe.
+    // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
+    var activeElement;
+    try {
+      activeElement = document.activeElement;
+    } catch(e) {
+      activeElement = document.body || null;
+    }
+    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
+      { activeElement = activeElement.shadowRoot.activeElement; }
+    return activeElement
+  }
+
+  function addClass(node, cls) {
+    var current = node.className;
+    if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls; }
+  }
+  function joinClasses(a, b) {
+    var as = a.split(" ");
+    for (var i = 0; i < as.length; i++)
+      { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i]; } }
+    return b
+  }
+
+  var selectInput = function(node) { node.select(); };
+  if (ios) // Mobile Safari apparently has a bug where select() is broken.
+    { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }
+  else if (ie) // Suppress mysterious IE10 errors
+    { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }
+
+  function bind(f) {
+    var args = Array.prototype.slice.call(arguments, 1);
+    return function(){return f.apply(null, args)}
+  }
+
+  function copyObj(obj, target, overwrite) {
+    if (!target) { target = {}; }
+    for (var prop in obj)
+      { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
+        { target[prop] = obj[prop]; } }
+    return target
+  }
+
+  // Counts the column offset in a string, taking tabs into account.
+  // Used mostly to find indentation.
+  function countColumn(string, end, tabSize, startIndex, startValue) {
+    if (end == null) {
+      end = string.search(/[^\s\u00a0]/);
+      if (end == -1) { end = string.length; }
+    }
+    for (var i = startIndex || 0, n = startValue || 0;;) {
+      var nextTab = string.indexOf("\t", i);
+      if (nextTab < 0 || nextTab >= end)
+        { return n + (end - i) }
+      n += nextTab - i;
+      n += tabSize - (n % tabSize);
+      i = nextTab + 1;
+    }
+  }
+
+  var Delayed = function() {
+    this.id = null;
+    this.f = null;
+    this.time = 0;
+    this.handler = bind(this.onTimeout, this);
+  };
+  Delayed.prototype.onTimeout = function (self) {
+    self.id = 0;
+    if (self.time <= +new Date) {
+      self.f();
+    } else {
+      setTimeout(self.handler, self.time - +new Date);
+    }
+  };
+  Delayed.prototype.set = function (ms, f) {
+    this.f = f;
+    var time = +new Date + ms;
+    if (!this.id || time < this.time) {
+      clearTimeout(this.id);
+      this.id = setTimeout(this.handler, ms);
+      this.time = time;
+    }
+  };
+
+  function indexOf(array, elt) {
+    for (var i = 0; i < array.length; ++i)
+      { if (array[i] == elt) { return i } }
+    return -1
+  }
+
+  // Number of pixels added to scroller and sizer to hide scrollbar
+  var scrollerGap = 50;
+
+  // Returned or thrown by various protocols to signal 'I'm not
+  // handling this'.
+  var Pass = {toString: function(){return "CodeMirror.Pass"}};
+
+  // Reused option objects for setSelection & friends
+  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};
+
+  // The inverse of countColumn -- find the offset that corresponds to
+  // a particular column.
+  function findColumn(string, goal, tabSize) {
+    for (var pos = 0, col = 0;;) {
+      var nextTab = string.indexOf("\t", pos);
+      if (nextTab == -1) { nextTab = string.length; }
+      var skipped = nextTab - pos;
+      if (nextTab == string.length || col + skipped >= goal)
+        { return pos + Math.min(skipped, goal - col) }
+      col += nextTab - pos;
+      col += tabSize - (col % tabSize);
+      pos = nextTab + 1;
+      if (col >= goal) { return pos }
+    }
+  }
+
+  var spaceStrs = [""];
+  function spaceStr(n) {
+    while (spaceStrs.length <= n)
+      { spaceStrs.push(lst(spaceStrs) + " "); }
+    return spaceStrs[n]
+  }
+
+  function lst(arr) { return arr[arr.length-1] }
+
+  function map(array, f) {
+    var out = [];
+    for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }
+    return out
+  }
+
+  function insertSorted(array, value, score) {
+    var pos = 0, priority = score(value);
+    while (pos < array.length && score(array[pos]) <= priority) { pos++; }
+    array.splice(pos, 0, value);
+  }
+
+  function nothing() {}
+
+  function createObj(base, props) {
+    var inst;
+    if (Object.create) {
+      inst = Object.create(base);
+    } else {
+      nothing.prototype = base;
+      inst = new nothing();
+    }
+    if (props) { copyObj(props, inst); }
+    return inst
+  }
+
+  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
+  function isWordCharBasic(ch) {
+    return /\w/.test(ch) || ch > "\x80" &&
+      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
+  }
+  function isWordChar(ch, helper) {
+    if (!helper) { return isWordCharBasic(ch) }
+    if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
+    return helper.test(ch)
+  }
+
+  function isEmpty(obj) {
+    for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
+    return true
+  }
+
+  // Extending unicode characters. A series of a non-extending char +
+  // any number of extending chars is treated as a single unit as far
+  // as editing and measuring is concerned. This is not fully correct,
+  // since some scripts/fonts/browsers also treat other configurations
+  // of code points as a group.
+  var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
+  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }
+
+  // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
+  function skipExtendingChars(str, pos, dir) {
+    while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }
+    return pos
+  }
+
+  // Returns the value from the range [`from`; `to`] that satisfies
+  // `pred` and is closest to `from`. Assumes that at least `to`
+  // satisfies `pred`. Supports `from` being greater than `to`.
+  function findFirst(pred, from, to) {
+    // At any point we are certain `to` satisfies `pred`, don't know
+    // whether `from` does.
+    var dir = from > to ? -1 : 1;
+    for (;;) {
+      if (from == to) { return from }
+      var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
+      if (mid == from) { return pred(mid) ? from : to }
+      if (pred(mid)) { to = mid; }
+      else { from = mid + dir; }
+    }
+  }
+
+  // BIDI HELPERS
+
+  function iterateBidiSections(order, from, to, f) {
+    if (!order) { return f(from, to, "ltr", 0) }
+    var found = false;
+    for (var i = 0; i < order.length; ++i) {
+      var part = order[i];
+      if (part.from < to && part.to > from || from == to && part.to == from) {
+        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
+        found = true;
+      }
+    }
+    if (!found) { f(from, to, "ltr"); }
+  }
+
+  var bidiOther = null;
+  function getBidiPartAt(order, ch, sticky) {
+    var found;
+    bidiOther = null;
+    for (var i = 0; i < order.length; ++i) {
+      var cur = order[i];
+      if (cur.from < ch && cur.to > ch) { return i }
+      if (cur.to == ch) {
+        if (cur.from != cur.to && sticky == "before") { found = i; }
+        else { bidiOther = i; }
+      }
+      if (cur.from == ch) {
+        if (cur.from != cur.to && sticky != "before") { found = i; }
+        else { bidiOther = i; }
+      }
+    }
+    return found != null ? found : bidiOther
+  }
+
+  // Bidirectional ordering algorithm
+  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
+  // that this (partially) implements.
+
+  // One-char codes used for character types:
+  // L (L):   Left-to-Right
+  // R (R):   Right-to-Left
+  // r (AL):  Right-to-Left Arabic
+  // 1 (EN):  European Number
+  // + (ES):  European Number Separator
+  // % (ET):  European Number Terminator
+  // n (AN):  Arabic Number
+  // , (CS):  Common Number Separator
+  // m (NSM): Non-Spacing Mark
+  // b (BN):  Boundary Neutral
+  // s (B):   Paragraph Separator
+  // t (S):   Segment Separator
+  // w (WS):  Whitespace
+  // N (ON):  Other Neutrals
+
+  // Returns null if characters are ordered as they appear
+  // (left-to-right), or an array of sections ({from, to, level}
+  // objects) in the order in which they occur visually.
+  var bidiOrdering = (function() {
+    // Character types for codepoints 0 to 0xff
+    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
+    // Character types for codepoints 0x600 to 0x6f9
+    var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
+    function charType(code) {
+      if (code <= 0xf7) { return lowTypes.charAt(code) }
+      else if (0x590 <= code && code <= 0x5f4) { return "R" }
+      else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
+      else if (0x6ee <= code && code <= 0x8ac) { return "r" }
+      else if (0x2000 <= code && code <= 0x200b) { return "w" }
+      else if (code == 0x200c) { return "b" }
+      else { return "L" }
+    }
+
+    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
+    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
+
+    function BidiSpan(level, from, to) {
+      this.level = level;
+      this.from = from; this.to = to;
+    }
+
+    return function(str, direction) {
+      var outerType = direction == "ltr" ? "L" : "R";
+
+      if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
+      var len = str.length, types = [];
+      for (var i = 0; i < len; ++i)
+        { types.push(charType(str.charCodeAt(i))); }
+
+      // W1. Examine each non-spacing mark (NSM) in the level run, and
+      // change the type of the NSM to the type of the previous
+      // character. If the NSM is at the start of the level run, it will
+      // get the type of sor.
+      for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
+        var type = types[i$1];
+        if (type == "m") { types[i$1] = prev; }
+        else { prev = type; }
+      }
+
+      // W2. Search backwards from each instance of a European number
+      // until the first strong type (R, L, AL, or sor) is found. If an
+      // AL is found, change the type of the European number to Arabic
+      // number.
+      // W3. Change all ALs to R.
+      for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
+        var type$1 = types[i$2];
+        if (type$1 == "1" && cur == "r") { types[i$2] = "n"; }
+        else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R"; } }
+      }
+
+      // W4. A single European separator between two European numbers
+      // changes to a European number. A single common separator between
+      // two numbers of the same type changes to that type.
+      for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
+        var type$2 = types[i$3];
+        if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1"; }
+        else if (type$2 == "," && prev$1 == types[i$3+1] &&
+                 (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1; }
+        prev$1 = type$2;
+      }
+
+      // W5. A sequence of European terminators adjacent to European
+      // numbers changes to all European numbers.
+      // W6. Otherwise, separators and terminators change to Other
+      // Neutral.
+      for (var i$4 = 0; i$4 < len; ++i$4) {
+        var type$3 = types[i$4];
+        if (type$3 == ",") { types[i$4] = "N"; }
+        else if (type$3 == "%") {
+          var end = (void 0);
+          for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
+          var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
+          for (var j = i$4; j < end; ++j) { types[j] = replace; }
+          i$4 = end - 1;
+        }
+      }
+
+      // W7. Search backwards from each instance of a European number
+      // until the first strong type (R, L, or sor) is found. If an L is
+      // found, then change the type of the European number to L.
+      for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
+        var type$4 = types[i$5];
+        if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L"; }
+        else if (isStrong.test(type$4)) { cur$1 = type$4; }
+      }
+
+      // N1. A sequence of neutrals takes the direction of the
+      // surrounding strong text if the text on both sides has the same
+      // direction. European and Arabic numbers act as if they were R in
+      // terms of their influence on neutrals. Start-of-level-run (sor)
+      // and end-of-level-run (eor) are used at level run boundaries.
+      // N2. Any remaining neutrals take the embedding direction.
+      for (var i$6 = 0; i$6 < len; ++i$6) {
+        if (isNeutral.test(types[i$6])) {
+          var end$1 = (void 0);
+          for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
+          var before = (i$6 ? types[i$6-1] : outerType) == "L";
+          var after = (end$1 < len ? types[end$1] : outerType) == "L";
+          var replace$1 = before == after ? (before ? "L" : "R") : outerType;
+          for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }
+          i$6 = end$1 - 1;
+        }
+      }
+
+      // Here we depart from the documented algorithm, in order to avoid
+      // building up an actual levels array. Since there are only three
+      // levels (0, 1, 2) in an implementation that doesn't take
+      // explicit embedding into account, we can build up the order on
+      // the fly, without following the level-based algorithm.
+      var order = [], m;
+      for (var i$7 = 0; i$7 < len;) {
+        if (countsAsLeft.test(types[i$7])) {
+          var start = i$7;
+          for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
+          order.push(new BidiSpan(0, start, i$7));
+        } else {
+          var pos = i$7, at = order.length, isRTL = direction == "rtl" ? 1 : 0;
+          for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
+          for (var j$2 = pos; j$2 < i$7;) {
+            if (countsAsNum.test(types[j$2])) {
+              if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }
+              var nstart = j$2;
+              for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
+              order.splice(at, 0, new BidiSpan(2, nstart, j$2));
+              at += isRTL;
+              pos = j$2;
+            } else { ++j$2; }
+          }
+          if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }
+        }
+      }
+      if (direction == "ltr") {
+        if (order[0].level == 1 && (m = str.match(/^\s+/))) {
+          order[0].from = m[0].length;
+          order.unshift(new BidiSpan(0, 0, m[0].length));
+        }
+        if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
+          lst(order).to -= m[0].length;
+          order.push(new BidiSpan(0, len - m[0].length, len));
+        }
+      }
+
+      return direction == "rtl" ? order.reverse() : order
+    }
+  })();
+
+  // Get the bidi ordering for the given line (and cache it). Returns
+  // false for lines that are fully left-to-right, and an array of
+  // BidiSpan objects otherwise.
+  function getOrder(line, direction) {
+    var order = line.order;
+    if (order == null) { order = line.order = bidiOrdering(line.text, direction); }
+    return order
+  }
+
+  // EVENT HANDLING
+
+  // Lightweight event framework. on/off also work on DOM nodes,
+  // registering native DOM handlers.
+
+  var noHandlers = [];
+
+  var on = function(emitter, type, f) {
+    if (emitter.addEventListener) {
+      emitter.addEventListener(type, f, false);
+    } else if (emitter.attachEvent) {
+      emitter.attachEvent("on" + type, f);
+    } else {
+      var map = emitter._handlers || (emitter._handlers = {});
+      map[type] = (map[type] || noHandlers).concat(f);
+    }
+  };
+
+  function getHandlers(emitter, type) {
+    return emitter._handlers && emitter._handlers[type] || noHandlers
+  }
+
+  function off(emitter, type, f) {
+    if (emitter.removeEventListener) {
+      emitter.removeEventListener(type, f, false);
+    } else if (emitter.detachEvent) {
+      emitter.detachEvent("on" + type, f);
+    } else {
+      var map = emitter._handlers, arr = map && map[type];
+      if (arr) {
+        var index = indexOf(arr, f);
+        if (index > -1)
+          { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }
+      }
+    }
+  }
+
+  function signal(emitter, type /*, values...*/) {
+    var handlers = getHandlers(emitter, type);
+    if (!handlers.length) { return }
+    var args = Array.prototype.slice.call(arguments, 2);
+    for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }
+  }
+
+  // The DOM events that CodeMirror handles can be overridden by
+  // registering a (non-DOM) handler on the editor for the event name,
+  // and preventDefault-ing the event in that handler.
+  function signalDOMEvent(cm, e, override) {
+    if (typeof e == "string")
+      { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }
+    signal(cm, override || e.type, cm, e);
+    return e_defaultPrevented(e) || e.codemirrorIgnore
+  }
+
+  function signalCursorActivity(cm) {
+    var arr = cm._handlers && cm._handlers.cursorActivity;
+    if (!arr) { return }
+    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
+    for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
+      { set.push(arr[i]); } }
+  }
+
+  function hasHandler(emitter, type) {
+    return getHandlers(emitter, type).length > 0
+  }
+
+  // Add on and off methods to a constructor's prototype, to make
+  // registering events on such objects more convenient.
+  function eventMixin(ctor) {
+    ctor.prototype.on = function(type, f) {on(this, type, f);};
+    ctor.prototype.off = function(type, f) {off(this, type, f);};
+  }
+
+  // Due to the fact that we still support jurassic IE versions, some
+  // compatibility wrappers are needed.
+
+  function e_preventDefault(e) {
+    if (e.preventDefault) { e.preventDefault(); }
+    else { e.returnValue = false; }
+  }
+  function e_stopPropagation(e) {
+    if (e.stopPropagation) { e.stopPropagation(); }
+    else { e.cancelBubble = true; }
+  }
+  function e_defaultPrevented(e) {
+    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
+  }
+  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
+
+  function e_target(e) {return e.target || e.srcElement}
+  function e_button(e) {
+    var b = e.which;
+    if (b == null) {
+      if (e.button & 1) { b = 1; }
+      else if (e.button & 2) { b = 3; }
+      else if (e.button & 4) { b = 2; }
+    }
+    if (mac && e.ctrlKey && b == 1) { b = 3; }
+    return b
+  }
+
+  // Detect drag-and-drop
+  var dragAndDrop = function() {
+    // There is *some* kind of drag-and-drop support in IE6-8, but I
+    // couldn't get it to work yet.
+    if (ie && ie_version < 9) { return false }
+    var div = elt('div');
+    return "draggable" in div || "dragDrop" in div
+  }();
+
+  var zwspSupported;
+  function zeroWidthElement(measure) {
+    if (zwspSupported == null) {
+      var test = elt("span", "\u200b");
+      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
+      if (measure.firstChild.offsetHeight != 0)
+        { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }
+    }
+    var node = zwspSupported ? elt("span", "\u200b") :
+      elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
+    node.setAttribute("cm-text", "");
+    return node
+  }
+
+  // Feature-detect IE's crummy client rect reporting for bidi text
+  var badBidiRects;
+  function hasBadBidiRects(measure) {
+    if (badBidiRects != null) { return badBidiRects }
+    var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
+    var r0 = range(txt, 0, 1).getBoundingClientRect();
+    var r1 = range(txt, 1, 2).getBoundingClientRect();
+    removeChildren(measure);
+    if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
+    return badBidiRects = (r1.right - r0.right < 3)
+  }
+
+  // See if "".split is the broken IE version, if so, provide an
+  // alternative way to split lines.
+  var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
+    var pos = 0, result = [], l = string.length;
+    while (pos <= l) {
+      var nl = string.indexOf("\n", pos);
+      if (nl == -1) { nl = string.length; }
+      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
+      var rt = line.indexOf("\r");
+      if (rt != -1) {
+        result.push(line.slice(0, rt));
+        pos += rt + 1;
+      } else {
+        result.push(line);
+        pos = nl + 1;
+      }
+    }
+    return result
+  } : function (string) { return string.split(/\r\n?|\n/); };
+
+  var hasSelection = window.getSelection ? function (te) {
+    try { return te.selectionStart != te.selectionEnd }
+    catch(e) { return false }
+  } : function (te) {
+    var range;
+    try {range = te.ownerDocument.selection.createRange();}
+    catch(e) {}
+    if (!range || range.parentElement() != te) { return false }
+    return range.compareEndPoints("StartToEnd", range) != 0
+  };
+
+  var hasCopyEvent = (function () {
+    var e = elt("div");
+    if ("oncopy" in e) { return true }
+    e.setAttribute("oncopy", "return;");
+    return typeof e.oncopy == "function"
+  })();
+
+  var badZoomedRects = null;
+  function hasBadZoomedRects(measure) {
+    if (badZoomedRects != null) { return badZoomedRects }
+    var node = removeChildrenAndAdd(measure, elt("span", "x"));
+    var normal = node.getBoundingClientRect();
+    var fromRange = range(node, 0, 1).getBoundingClientRect();
+    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
+  }
+
+  // Known modes, by name and by MIME
+  var modes = {}, mimeModes = {};
+
+  // Extra arguments are stored as the mode's dependencies, which is
+  // used by (legacy) mechanisms like loadmode.js to automatically
+  // load a mode. (Preferred mechanism is the require/define calls.)
+  function defineMode(name, mode) {
+    if (arguments.length > 2)
+      { mode.dependencies = Array.prototype.slice.call(arguments, 2); }
+    modes[name] = mode;
+  }
+
+  function defineMIME(mime, spec) {
+    mimeModes[mime] = spec;
+  }
+
+  // Given a MIME type, a {name, ...options} config object, or a name
+  // string, return a mode config object.
+  function resolveMode(spec) {
+    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
+      spec = mimeModes[spec];
+    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
+      var found = mimeModes[spec.name];
+      if (typeof found == "string") { found = {name: found}; }
+      spec = createObj(found, spec);
+      spec.name = found.name;
+    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
+      return resolveMode("application/xml")
+    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
+      return resolveMode("application/json")
+    }
+    if (typeof spec == "string") { return {name: spec} }
+    else { return spec || {name: "null"} }
+  }
+
+  // Given a mode spec (anything that resolveMode accepts), find and
+  // initialize an actual mode object.
+  function getMode(options, spec) {
+    spec = resolveMode(spec);
+    var mfactory = modes[spec.name];
+    if (!mfactory) { return getMode(options, "text/plain") }
+    var modeObj = mfactory(options, spec);
+    if (modeExtensions.hasOwnProperty(spec.name)) {
+      var exts = modeExtensions[spec.name];
+      for (var prop in exts) {
+        if (!exts.hasOwnProperty(prop)) { continue }
+        if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop]; }
+        modeObj[prop] = exts[prop];
+      }
+    }
+    modeObj.name = spec.name;
+    if (spec.helperType) { modeObj.helperType = spec.helperType; }
+    if (spec.modeProps) { for (var prop$1 in spec.modeProps)
+      { modeObj[prop$1] = spec.modeProps[prop$1]; } }
+
+    return modeObj
+  }
+
+  // This can be used to attach properties to mode objects from
+  // outside the actual mode definition.
+  var modeExtensions = {};
+  function extendMode(mode, properties) {
+    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
+    copyObj(properties, exts);
+  }
+
+  function copyState(mode, state) {
+    if (state === true) { return state }
+    if (mode.copyState) { return mode.copyState(state) }
+    var nstate = {};
+    for (var n in state) {
+      var val = state[n];
+      if (val instanceof Array) { val = val.concat([]); }
+      nstate[n] = val;
+    }
+    return nstate
+  }
+
+  // Given a mode and a state (for that mode), find the inner mode and
+  // state at the position that the state refers to.
+  function innerMode(mode, state) {
+    var info;
+    while (mode.innerMode) {
+      info = mode.innerMode(state);
+      if (!info || info.mode == mode) { break }
+      state = info.state;
+      mode = info.mode;
+    }
+    return info || {mode: mode, state: state}
+  }
+
+  function startState(mode, a1, a2) {
+    return mode.startState ? mode.startState(a1, a2) : true
+  }
+
+  // STRING STREAM
+
+  // Fed to the mode parsers, provides helper functions to make
+  // parsers more succinct.
+
+  var StringStream = function(string, tabSize, lineOracle) {
+    this.pos = this.start = 0;
+    this.string = string;
+    this.tabSize = tabSize || 8;
+    this.lastColumnPos = this.lastColumnValue = 0;
+    this.lineStart = 0;
+    this.lineOracle = lineOracle;
+  };
+
+  StringStream.prototype.eol = function () {return this.pos >= this.string.length};
+  StringStream.prototype.sol = function () {return this.pos == this.lineStart};
+  StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
+  StringStream.prototype.next = function () {
+    if (this.pos < this.string.length)
+      { return this.string.charAt(this.pos++) }
+  };
+  StringStream.prototype.eat = function (match) {
+    var ch = this.string.charAt(this.pos);
+    var ok;
+    if (typeof match == "string") { ok = ch == match; }
+    else { ok = ch && (match.test ? match.test(ch) : match(ch)); }
+    if (ok) {++this.pos; return ch}
+  };
+  StringStream.prototype.eatWhile = function (match) {
+    var start = this.pos;
+    while (this.eat(match)){}
+    return this.pos > start
+  };
+  StringStream.prototype.eatSpace = function () {
+    var start = this.pos;
+    while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }
+    return this.pos > start
+  };
+  StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};
+  StringStream.prototype.skipTo = function (ch) {
+    var found = this.string.indexOf(ch, this.pos);
+    if (found > -1) {this.pos = found; return true}
+  };
+  StringStream.prototype.backUp = function (n) {this.pos -= n;};
+  StringStream.prototype.column = function () {
+    if (this.lastColumnPos < this.start) {
+      this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
+      this.lastColumnPos = this.start;
+    }
+    return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
+  };
+  StringStream.prototype.indentation = function () {
+    return countColumn(this.string, null, this.tabSize) -
+      (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
+  };
+  StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
+    if (typeof pattern == "string") {
+      var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };
+      var substr = this.string.substr(this.pos, pattern.length);
+      if (cased(substr) == cased(pattern)) {
+        if (consume !== false) { this.pos += pattern.length; }
+        return true
+      }
+    } else {
+      var match = this.string.slice(this.pos).match(pattern);
+      if (match && match.index > 0) { return null }
+      if (match && consume !== false) { this.pos += match[0].length; }
+      return match
+    }
+  };
+  StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
+  StringStream.prototype.hideFirstChars = function (n, inner) {
+    this.lineStart += n;
+    try { return inner() }
+    finally { this.lineStart -= n; }
+  };
+  StringStream.prototype.lookAhead = function (n) {
+    var oracle = this.lineOracle;
+    return oracle && oracle.lookAhead(n)
+  };
+  StringStream.prototype.baseToken = function () {
+    var oracle = this.lineOracle;
+    return oracle && oracle.baseToken(this.pos)
+  };
+
+  // Find the line object corresponding to the given line number.
+  function getLine(doc, n) {
+    n -= doc.first;
+    if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
+    var chunk = doc;
+    while (!chunk.lines) {
+      for (var i = 0;; ++i) {
+        var child = chunk.children[i], sz = child.chunkSize();
+        if (n < sz) { chunk = child; break }
+        n -= sz;
+      }
+    }
+    return chunk.lines[n]
+  }
+
+  // Get the part of a document between two positions, as an array of
+  // strings.
+  function getBetween(doc, start, end) {
+    var out = [], n = start.line;
+    doc.iter(start.line, end.line + 1, function (line) {
+      var text = line.text;
+      if (n == end.line) { text = text.slice(0, end.ch); }
+      if (n == start.line) { text = text.slice(start.ch); }
+      out.push(text);
+      ++n;
+    });
+    return out
+  }
+  // Get the lines between from and to, as array of strings.
+  function getLines(doc, from, to) {
+    var out = [];
+    doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value
+    return out
+  }
+
+  // Update the height of a line, propagating the height change
+  // upwards to parent nodes.
+  function updateLineHeight(line, height) {
+    var diff = height - line.height;
+    if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }
+  }
+
+  // Given a line object, find its line number by walking up through
+  // its parent links.
+  function lineNo(line) {
+    if (line.parent == null) { return null }
+    var cur = line.parent, no = indexOf(cur.lines, line);
+    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
+      for (var i = 0;; ++i) {
+        if (chunk.children[i] == cur) { break }
+        no += chunk.children[i].chunkSize();
+      }
+    }
+    return no + cur.first
+  }
+
+  // Find the line at the given vertical position, using the height
+  // information in the document tree.
+  function lineAtHeight(chunk, h) {
+    var n = chunk.first;
+    outer: do {
+      for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
+        var child = chunk.children[i$1], ch = child.height;
+        if (h < ch) { chunk = child; continue outer }
+        h -= ch;
+        n += child.chunkSize();
+      }
+      return n
+    } while (!chunk.lines)
+    var i = 0;
+    for (; i < chunk.lines.length; ++i) {
+      var line = chunk.lines[i], lh = line.height;
+      if (h < lh) { break }
+      h -= lh;
+    }
+    return n + i
+  }
+
+  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}
+
+  function lineNumberFor(options, i) {
+    return String(options.lineNumberFormatter(i + options.firstLineNumber))
+  }
+
+  // A Pos instance represents a position within the text.
+  function Pos(line, ch, sticky) {
+    if ( sticky === void 0 ) sticky = null;
+
+    if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
+    this.line = line;
+    this.ch = ch;
+    this.sticky = sticky;
+  }
+
+  // Compare two positions, return 0 if they are the same, a negative
+  // number when a is less, and a positive number otherwise.
+  function cmp(a, b) { return a.line - b.line || a.ch - b.ch }
+
+  function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }
+
+  function copyPos(x) {return Pos(x.line, x.ch)}
+  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
+  function minPos(a, b) { return cmp(a, b) < 0 ? a : b }
+
+  // Most of the external API clips given positions to make sure they
+  // actually exist within the document.
+  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
+  function clipPos(doc, pos) {
+    if (pos.line < doc.first) { return Pos(doc.first, 0) }
+    var last = doc.first + doc.size - 1;
+    if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
+    return clipToLen(pos, getLine(doc, pos.line).text.length)
+  }
+  function clipToLen(pos, linelen) {
+    var ch = pos.ch;
+    if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
+    else if (ch < 0) { return Pos(pos.line, 0) }
+    else { return pos }
+  }
+  function clipPosArray(doc, array) {
+    var out = [];
+    for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }
+    return out
+  }
+
+  var SavedContext = function(state, lookAhead) {
+    this.state = state;
+    this.lookAhead = lookAhead;
+  };
+
+  var Context = function(doc, state, line, lookAhead) {
+    this.state = state;
+    this.doc = doc;
+    this.line = line;
+    this.maxLookAhead = lookAhead || 0;
+    this.baseTokens = null;
+    this.baseTokenPos = 1;
+  };
+
+  Context.prototype.lookAhead = function (n) {
+    var line = this.doc.getLine(this.line + n);
+    if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }
+    return line
+  };
+
+  Context.prototype.baseToken = function (n) {
+    if (!this.baseTokens) { return null }
+    while (this.baseTokens[this.baseTokenPos] <= n)
+      { this.baseTokenPos += 2; }
+    var type = this.baseTokens[this.baseTokenPos + 1];
+    return {type: type && type.replace(/( |^)overlay .*/, ""),
+            size: this.baseTokens[this.baseTokenPos] - n}
+  };
+
+  Context.prototype.nextLine = function () {
+    this.line++;
+    if (this.maxLookAhead > 0) { this.maxLookAhead--; }
+  };
+
+  Context.fromSaved = function (doc, saved, line) {
+    if (saved instanceof SavedContext)
+      { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
+    else
+      { return new Context(doc, copyState(doc.mode, saved), line) }
+  };
+
+  Context.prototype.save = function (copy) {
+    var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
+    return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
+  };
+
+
+  // Compute a style array (an array starting with a mode generation
+  // -- for invalidation -- followed by pairs of end positions and
+  // style strings), which is used to highlight the tokens on the
+  // line.
+  function highlightLine(cm, line, context, forceToEnd) {
+    // A styles array always starts with a number identifying the
+    // mode/overlays that it is based on (for easy invalidation).
+    var st = [cm.state.modeGen], lineClasses = {};
+    // Compute the base array of styles
+    runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
+            lineClasses, forceToEnd);
+    var state = context.state;
+
+    // Run overlays, adjust style array.
+    var loop = function ( o ) {
+      context.baseTokens = st;
+      var overlay = cm.state.overlays[o], i = 1, at = 0;
+      context.state = true;
+      runMode(cm, line.text, overlay.mode, context, function (end, style) {
+        var start = i;
+        // Ensure there's a token end at the current position, and that i points at it
+        while (at < end) {
+          var i_end = st[i];
+          if (i_end > end)
+            { st.splice(i, 1, end, st[i+1], i_end); }
+          i += 2;
+          at = Math.min(end, i_end);
+        }
+        if (!style) { return }
+        if (overlay.opaque) {
+          st.splice(start, i - start, end, "overlay " + style);
+          i = start + 2;
+        } else {
+          for (; start < i; start += 2) {
+            var cur = st[start+1];
+            st[start+1] = (cur ? cur + " " : "") + "overlay " + style;
+          }
+        }
+      }, lineClasses);
+      context.state = state;
+      context.baseTokens = null;
+      context.baseTokenPos = 1;
+    };
+
+    for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );
+
+    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
+  }
+
+  function getLineStyles(cm, line, updateFrontier) {
+    if (!line.styles || line.styles[0] != cm.state.modeGen) {
+      var context = getContextBefore(cm, lineNo(line));
+      var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
+      var result = highlightLine(cm, line, context);
+      if (resetState) { context.state = resetState; }
+      line.stateAfter = context.save(!resetState);
+      line.styles = result.styles;
+      if (result.classes) { line.styleClasses = result.classes; }
+      else if (line.styleClasses) { line.styleClasses = null; }
+      if (updateFrontier === cm.doc.highlightFrontier)
+        { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }
+    }
+    return line.styles
+  }
+
+  function getContextBefore(cm, n, precise) {
+    var doc = cm.doc, display = cm.display;
+    if (!doc.mode.startState) { return new Context(doc, true, n) }
+    var start = findStartLine(cm, n, precise);
+    var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
+    var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);
+
+    doc.iter(start, n, function (line) {
+      processLine(cm, line.text, context);
+      var pos = context.line;
+      line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
+      context.nextLine();
+    });
+    if (precise) { doc.modeFrontier = context.line; }
+    return context
+  }
+
+  // Lightweight form of highlight -- proceed over this line and
+  // update state, but don't save a style array. Used for lines that
+  // aren't currently visible.
+  function processLine(cm, text, context, startAt) {
+    var mode = cm.doc.mode;
+    var stream = new StringStream(text, cm.options.tabSize, context);
+    stream.start = stream.pos = startAt || 0;
+    if (text == "") { callBlankLine(mode, context.state); }
+    while (!stream.eol()) {
+      readToken(mode, stream, context.state);
+      stream.start = stream.pos;
+    }
+  }
+
+  function callBlankLine(mode, state) {
+    if (mode.blankLine) { return mode.blankLine(state) }
+    if (!mode.innerMode) { return }
+    var inner = innerMode(mode, state);
+    if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
+  }
+
+  function readToken(mode, stream, state, inner) {
+    for (var i = 0; i < 10; i++) {
+      if (inner) { inner[0] = innerMode(mode, state).mode; }
+      var style = mode.token(stream, state);
+      if (stream.pos > stream.start) { return style }
+    }
+    throw new Error("Mode " + mode.name + " failed to advance stream.")
+  }
+
+  var Token = function(stream, type, state) {
+    this.start = stream.start; this.end = stream.pos;
+    this.string = stream.current();
+    this.type = type || null;
+    this.state = state;
+  };
+
+  // Utility for getTokenAt and getLineTokens
+  function takeToken(cm, pos, precise, asArray) {
+    var doc = cm.doc, mode = doc.mode, style;
+    pos = clipPos(doc, pos);
+    var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
+    var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
+    if (asArray) { tokens = []; }
+    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
+      stream.start = stream.pos;
+      style = readToken(mode, stream, context.state);
+      if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }
+    }
+    return asArray ? tokens : new Token(stream, style, context.state)
+  }
+
+  function extractLineClasses(type, output) {
+    if (type) { for (;;) {
+      var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
+      if (!lineClass) { break }
+      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
+      var prop = lineClass[1] ? "bgClass" : "textClass";
+      if (output[prop] == null)
+        { output[prop] = lineClass[2]; }
+      else if (!(new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)")).test(output[prop]))
+        { output[prop] += " " + lineClass[2]; }
+    } }
+    return type
+  }
+
+  // Run the given mode's parser over a line, calling f for each token.
+  function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
+    var flattenSpans = mode.flattenSpans;
+    if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }
+    var curStart = 0, curStyle = null;
+    var stream = new StringStream(text, cm.options.tabSize, context), style;
+    var inner = cm.options.addModeClass && [null];
+    if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }
+    while (!stream.eol()) {
+      if (stream.pos > cm.options.maxHighlightLength) {
+        flattenSpans = false;
+        if (forceToEnd) { processLine(cm, text, context, stream.pos); }
+        stream.pos = text.length;
+        style = null;
+      } else {
+        style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
+      }
+      if (inner) {
+        var mName = inner[0].name;
+        if (mName) { style = "m-" + (style ? mName + " " + style : mName); }
+      }
+      if (!flattenSpans || curStyle != style) {
+        while (curStart < stream.start) {
+          curStart = Math.min(stream.start, curStart + 5000);
+          f(curStart, curStyle);
+        }
+        curStyle = style;
+      }
+      stream.start = stream.pos;
+    }
+    while (curStart < stream.pos) {
+      // Webkit seems to refuse to render text nodes longer than 57444
+      // characters, and returns inaccurate measurements in nodes
+      // starting around 5000 chars.
+      var pos = Math.min(stream.pos, curStart + 5000);
+      f(pos, curStyle);
+      curStart = pos;
+    }
+  }
+
+  // Finds the line to start with when starting a parse. Tries to
+  // find a line with a stateAfter, so that it can start with a
+  // valid state. If that fails, it returns the line with the
+  // smallest indentation, which tends to need the least context to
+  // parse correctly.
+  function findStartLine(cm, n, precise) {
+    var minindent, minline, doc = cm.doc;
+    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
+    for (var search = n; search > lim; --search) {
+      if (search <= doc.first) { return doc.first }
+      var line = getLine(doc, search - 1), after = line.stateAfter;
+      if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
+        { return search }
+      var indented = countColumn(line.text, null, cm.options.tabSize);
+      if (minline == null || minindent > indented) {
+        minline = search - 1;
+        minindent = indented;
+      }
+    }
+    return minline
+  }
+
+  function retreatFrontier(doc, n) {
+    doc.modeFrontier = Math.min(doc.modeFrontier, n);
+    if (doc.highlightFrontier < n - 10) { return }
+    var start = doc.first;
+    for (var line = n - 1; line > start; line--) {
+      var saved = getLine(doc, line).stateAfter;
+      // change is on 3
+      // state on line 1 looked ahead 2 -- so saw 3
+      // test 1 + 2 < 3 should cover this
+      if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
+        start = line + 1;
+        break
+      }
+    }
+    doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
+  }
+
+  // Optimize some code when these features are not used.
+  var sawReadOnlySpans = false, sawCollapsedSpans = false;
+
+  function seeReadOnlySpans() {
+    sawReadOnlySpans = true;
+  }
+
+  function seeCollapsedSpans() {
+    sawCollapsedSpans = true;
+  }
+
+  // TEXTMARKER SPANS
+
+  function MarkedSpan(marker, from, to) {
+    this.marker = marker;
+    this.from = from; this.to = to;
+  }
+
+  // Search an array of spans for a span matching the given marker.
+  function getMarkedSpanFor(spans, marker) {
+    if (spans) { for (var i = 0; i < spans.length; ++i) {
+      var span = spans[i];
+      if (span.marker == marker) { return span }
+    } }
+  }
+
+  // Remove a span from an array, returning undefined if no spans are
+  // left (we don't store arrays for lines without spans).
+  function removeMarkedSpan(spans, span) {
+    var r;
+    for (var i = 0; i < spans.length; ++i)
+      { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }
+    return r
+  }
+
+  // Add a span to a line.
+  function addMarkedSpan(line, span, op) {
+    var inThisOp = op && window.WeakSet && (op.markedSpans || (op.markedSpans = new WeakSet));
+    if (inThisOp && inThisOp.has(line.markedSpans)) {
+      line.markedSpans.push(span);
+    } else {
+      line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
+      if (inThisOp) { inThisOp.add(line.markedSpans); }
+    }
+    span.marker.attachLine(line);
+  }
+
+  // Used for the algorithm that adjusts markers for a change in the
+  // document. These functions cut an array of spans at a given
+  // character position, returning an array of remaining chunks (or
+  // undefined if nothing remains).
+  function markedSpansBefore(old, startCh, isInsert) {
+    var nw;
+    if (old) { for (var i = 0; i < old.length; ++i) {
+      var span = old[i], marker = span.marker;
+      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
+      if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
+        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
+        ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
+      }
+    } }
+    return nw
+  }
+  function markedSpansAfter(old, endCh, isInsert) {
+    var nw;
+    if (old) { for (var i = 0; i < old.length; ++i) {
+      var span = old[i], marker = span.marker;
+      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
+      if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
+        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
+        ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
+                                              span.to == null ? null : span.to - endCh));
+      }
+    } }
+    return nw
+  }
+
+  // Given a change object, compute the new set of marker spans that
+  // cover the line in which the change took place. Removes spans
+  // entirely within the change, reconnects spans belonging to the
+  // same marker that appear on both sides of the change, and cuts off
+  // spans partially within the change. Returns an array of span
+  // arrays with one element for each line in (after) the change.
+  function stretchSpansOverChange(doc, change) {
+    if (change.full) { return null }
+    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
+    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
+    if (!oldFirst && !oldLast) { return null }
+
+    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
+    // Get the spans that 'stick out' on both sides
+    var first = markedSpansBefore(oldFirst, startCh, isInsert);
+    var last = markedSpansAfter(oldLast, endCh, isInsert);
+
+    // Next, merge those two ends
+    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
+    if (first) {
+      // Fix up .to properties of first
+      for (var i = 0; i < first.length; ++i) {
+        var span = first[i];
+        if (span.to == null) {
+          var found = getMarkedSpanFor(last, span.marker);
+          if (!found) { span.to = startCh; }
+          else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }
+        }
+      }
+    }
+    if (last) {
+      // Fix up .from in last (or move them into first in case of sameLine)
+      for (var i$1 = 0; i$1 < last.length; ++i$1) {
+        var span$1 = last[i$1];
+        if (span$1.to != null) { span$1.to += offset; }
+        if (span$1.from == null) {
+          var found$1 = getMarkedSpanFor(first, span$1.marker);
+          if (!found$1) {
+            span$1.from = offset;
+            if (sameLine) { (first || (first = [])).push(span$1); }
+          }
+        } else {
+          span$1.from += offset;
+          if (sameLine) { (first || (first = [])).push(span$1); }
+        }
+      }
+    }
+    // Make sure we didn't create any zero-length spans
+    if (first) { first = clearEmptySpans(first); }
+    if (last && last != first) { last = clearEmptySpans(last); }
+
+    var newMarkers = [first];
+    if (!sameLine) {
+      // Fill gap with whole-line-spans
+      var gap = change.text.length - 2, gapMarkers;
+      if (gap > 0 && first)
+        { for (var i$2 = 0; i$2 < first.length; ++i$2)
+          { if (first[i$2].to == null)
+            { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }
+      for (var i$3 = 0; i$3 < gap; ++i$3)
+        { newMarkers.push(gapMarkers); }
+      newMarkers.push(last);
+    }
+    return newMarkers
+  }
+
+  // Remove spans that are empty and don't have a clearWhenEmpty
+  // option of false.
+  function clearEmptySpans(spans) {
+    for (var i = 0; i < spans.length; ++i) {
+      var span = spans[i];
+      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
+        { spans.splice(i--, 1); }
+    }
+    if (!spans.length) { return null }
+    return spans
+  }
+
+  // Used to 'clip' out readOnly ranges when making a change.
+  function removeReadOnlyRanges(doc, from, to) {
+    var markers = null;
+    doc.iter(from.line, to.line + 1, function (line) {
+      if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
+        var mark = line.markedSpans[i].marker;
+        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
+          { (markers || (markers = [])).push(mark); }
+      } }
+    });
+    if (!markers) { return null }
+    var parts = [{from: from, to: to}];
+    for (var i = 0; i < markers.length; ++i) {
+      var mk = markers[i], m = mk.find(0);
+      for (var j = 0; j < parts.length; ++j) {
+        var p = parts[j];
+        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
+        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
+        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
+          { newParts.push({from: p.from, to: m.from}); }
+        if (dto > 0 || !mk.inclusiveRight && !dto)
+          { newParts.push({from: m.to, to: p.to}); }
+        parts.splice.apply(parts, newParts);
+        j += newParts.length - 3;
+      }
+    }
+    return parts
+  }
+
+  // Connect or disconnect spans from a line.
+  function detachMarkedSpans(line) {
+    var spans = line.markedSpans;
+    if (!spans) { return }
+    for (var i = 0; i < spans.length; ++i)
+      { spans[i].marker.detachLine(line); }
+    line.markedSpans = null;
+  }
+  function attachMarkedSpans(line, spans) {
+    if (!spans) { return }
+    for (var i = 0; i < spans.length; ++i)
+      { spans[i].marker.attachLine(line); }
+    line.markedSpans = spans;
+  }
+
+  // Helpers used when computing which overlapping collapsed span
+  // counts as the larger one.
+  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
+  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }
+
+  // Returns a number indicating which of two overlapping collapsed
+  // spans is larger (and thus includes the other). Falls back to
+  // comparing ids when the spans cover exactly the same range.
+  function compareCollapsedMarkers(a, b) {
+    var lenDiff = a.lines.length - b.lines.length;
+    if (lenDiff != 0) { return lenDiff }
+    var aPos = a.find(), bPos = b.find();
+    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
+    if (fromCmp) { return -fromCmp }
+    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
+    if (toCmp) { return toCmp }
+    return b.id - a.id
+  }
+
+  // Find out whether a line ends or starts in a collapsed span. If
+  // so, return the marker for that span.
+  function collapsedSpanAtSide(line, start) {
+    var sps = sawCollapsedSpans && line.markedSpans, found;
+    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
+          (!found || compareCollapsedMarkers(found, sp.marker) < 0))
+        { found = sp.marker; }
+    } }
+    return found
+  }
+  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
+  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }
+
+  function collapsedSpanAround(line, ch) {
+    var sps = sawCollapsedSpans && line.markedSpans, found;
+    if (sps) { for (var i = 0; i < sps.length; ++i) {
+      var sp = sps[i];
+      if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&
+          (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }
+    } }
+    return found
+  }
+
+  // Test whether there exists a collapsed span that partially
+  // overlaps (covers the start or end, but not both) of a new span.
+  // Such overlap is not allowed.
+  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
+    var line = getLine(doc, lineNo);
+    var sps = sawCollapsedSpans && line.markedSpans;
+    if (sps) { for (var i = 0; i < sps.length; ++i) {
+      var sp = sps[i];
+      if (!sp.marker.collapsed) { continue }
+      var found = sp.marker.find(0);
+      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
+      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
+      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
+      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
+          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
+        { return true }
+    } }
+  }
+
+  // A visual line is a line as drawn on the screen. Folding, for
+  // example, can cause multiple logical lines to appear on the same
+  // visual line. This finds the start of the visual line that the
+  // given line is part of (usually that is the line itself).
+  function visualLine(line) {
+    var merged;
+    while (merged = collapsedSpanAtStart(line))
+      { line = merged.find(-1, true).line; }
+    return line
+  }
+
+  function visualLineEnd(line) {
+    var merged;
+    while (merged = collapsedSpanAtEnd(line))
+      { line = merged.find(1, true).line; }
+    return line
+  }
+
+  // Returns an array of logical lines that continue the visual line
+  // started by the argument, or undefined if there are no such lines.
+  function visualLineContinued(line) {
+    var merged, lines;
+    while (merged = collapsedSpanAtEnd(line)) {
+      line = merged.find(1, true).line
+      ;(lines || (lines = [])).push(line);
+    }
+    return lines
+  }
+
+  // Get the line number of the start of the visual line that the
+  // given line number is part of.
+  function visualLineNo(doc, lineN) {
+    var line = getLine(doc, lineN), vis = visualLine(line);
+    if (line == vis) { return lineN }
+    return lineNo(vis)
+  }
+
+  // Get the line number of the start of the next visual line after
+  // the given line.
+  function visualLineEndNo(doc, lineN) {
+    if (lineN > doc.lastLine()) { return lineN }
+    var line = getLine(doc, lineN), merged;
+    if (!lineIsHidden(doc, line)) { return lineN }
+    while (merged = collapsedSpanAtEnd(line))
+      { line = merged.find(1, true).line; }
+    return lineNo(line) + 1
+  }
+
+  // Compute whether a line is hidden. Lines count as hidden when they
+  // are part of a visual line that starts with another line, or when
+  // they are entirely covered by collapsed, non-widget span.
+  function lineIsHidden(doc, line) {
+    var sps = sawCollapsedSpans && line.markedSpans;
+    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (!sp.marker.collapsed) { continue }
+      if (sp.from == null) { return true }
+      if (sp.marker.widgetNode) { continue }
+      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
+        { return true }
+    } }
+  }
+  function lineIsHiddenInner(doc, line, span) {
+    if (span.to == null) {
+      var end = span.marker.find(1, true);
+      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
+    }
+    if (span.marker.inclusiveRight && span.to == line.text.length)
+      { return true }
+    for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
+      sp = line.markedSpans[i];
+      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
+          (sp.to == null || sp.to != span.from) &&
+          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
+          lineIsHiddenInner(doc, line, sp)) { return true }
+    }
+  }
+
+  // Find the height above the given line.
+  function heightAtLine(lineObj) {
+    lineObj = visualLine(lineObj);
+
+    var h = 0, chunk = lineObj.parent;
+    for (var i = 0; i < chunk.lines.length; ++i) {
+      var line = chunk.lines[i];
+      if (line == lineObj) { break }
+      else { h += line.height; }
+    }
+    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
+      for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
+        var cur = p.children[i$1];
+        if (cur == chunk) { break }
+        else { h += cur.height; }
+      }
+    }
+    return h
+  }
+
+  // Compute the character length of a line, taking into account
+  // collapsed ranges (see markText) that might hide parts, and join
+  // other lines onto it.
+  function lineLength(line) {
+    if (line.height == 0) { return 0 }
+    var len = line.text.length, merged, cur = line;
+    while (merged = collapsedSpanAtStart(cur)) {
+      var found = merged.find(0, true);
+      cur = found.from.line;
+      len += found.from.ch - found.to.ch;
+    }
+    cur = line;
+    while (merged = collapsedSpanAtEnd(cur)) {
+      var found$1 = merged.find(0, true);
+      len -= cur.text.length - found$1.from.ch;
+      cur = found$1.to.line;
+      len += cur.text.length - found$1.to.ch;
+    }
+    return len
+  }
+
+  // Find the longest line in the document.
+  function findMaxLine(cm) {
+    var d = cm.display, doc = cm.doc;
+    d.maxLine = getLine(doc, doc.first);
+    d.maxLineLength = lineLength(d.maxLine);
+    d.maxLineChanged = true;
+    doc.iter(function (line) {
+      var len = lineLength(line);
+      if (len > d.maxLineLength) {
+        d.maxLineLength = len;
+        d.maxLine = line;
+      }
+    });
+  }
+
+  // LINE DATA STRUCTURE
+
+  // Line objects. These hold state related to a line, including
+  // highlighting info (the styles array).
+  var Line = function(text, markedSpans, estimateHeight) {
+    this.text = text;
+    attachMarkedSpans(this, markedSpans);
+    this.height = estimateHeight ? estimateHeight(this) : 1;
+  };
+
+  Line.prototype.lineNo = function () { return lineNo(this) };
+  eventMixin(Line);
+
+  // Change the content (text, markers) of a line. Automatically
+  // invalidates cached information and tries to re-estimate the
+  // line's height.
+  function updateLine(line, text, markedSpans, estimateHeight) {
+    line.text = text;
+    if (line.stateAfter) { line.stateAfter = null; }
+    if (line.styles) { line.styles = null; }
+    if (line.order != null) { line.order = null; }
+    detachMarkedSpans(line);
+    attachMarkedSpans(line, markedSpans);
+    var estHeight = estimateHeight ? estimateHeight(line) : 1;
+    if (estHeight != line.height) { updateLineHeight(line, estHeight); }
+  }
+
+  // Detach a line from the document tree and its markers.
+  function cleanUpLine(line) {
+    line.parent = null;
+    detachMarkedSpans(line);
+  }
+
+  // Convert a style as returned by a mode (either null, or a string
+  // containing one or more styles) to a CSS style. This is cached,
+  // and also looks for line-wide styles.
+  var styleToClassCache = {}, styleToClassCacheWithMode = {};
+  function interpretTokenStyle(style, options) {
+    if (!style || /^\s*$/.test(style)) { return null }
+    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
+    return cache[style] ||
+      (cache[style] = style.replace(/\S+/g, "cm-$&"))
+  }
+
+  // Render the DOM representation of the text of a line. Also builds
+  // up a 'line map', which points at the DOM nodes that represent
+  // specific stretches of text, and is used by the measuring code.
+  // The returned object contains the DOM node, this map, and
+  // information about line-wide styles that were set by the mode.
+  function buildLineContent(cm, lineView) {
+    // The padding-right forces the element to have a 'border', which
+    // is needed on Webkit to be able to get line-level bounding
+    // rectangles for it (in measureChar).
+    var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
+    var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
+                   col: 0, pos: 0, cm: cm,
+                   trailingSpace: false,
+                   splitSpaces: cm.getOption("lineWrapping")};
+    lineView.measure = {};
+
+    // Iterate over the logical lines that make up this visual line.
+    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
+      var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
+      builder.pos = 0;
+      builder.addToken = buildToken;
+      // Optionally wire in some hacks into the token-rendering
+      // algorithm, to deal with browser quirks.
+      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
+        { builder.addToken = buildTokenBadBidi(builder.addToken, order); }
+      builder.map = [];
+      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
+      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
+      if (line.styleClasses) {
+        if (line.styleClasses.bgClass)
+          { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || ""); }
+        if (line.styleClasses.textClass)
+          { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || ""); }
+      }
+
+      // Ensure at least a single node is present, for measuring.
+      if (builder.map.length == 0)
+        { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }
+
+      // Store the map and a cache object for the current logical line
+      if (i == 0) {
+        lineView.measure.map = builder.map;
+        lineView.measure.cache = {};
+      } else {
+  (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
+        ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});
+      }
+    }
+
+    // See issue #2901
+    if (webkit) {
+      var last = builder.content.lastChild;
+      if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
+        { builder.content.className = "cm-tab-wrap-hack"; }
+    }
+
+    signal(cm, "renderLine", cm, lineView.line, builder.pre);
+    if (builder.pre.className)
+      { builder.textClass = joinClasses(builder.pre.className, builder.textClass || ""); }
+
+    return builder
+  }
+
+  function defaultSpecialCharPlaceholder(ch) {
+    var token = elt("span", "\u2022", "cm-invalidchar");
+    token.title = "\\u" + ch.charCodeAt(0).toString(16);
+    token.setAttribute("aria-label", token.title);
+    return token
+  }
+
+  // Build up the DOM representation for a single token, and add it to
+  // the line map. Takes care to render special characters separately.
+  function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {
+    if (!text) { return }
+    var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
+    var special = builder.cm.state.specialChars, mustWrap = false;
+    var content;
+    if (!special.test(text)) {
+      builder.col += text.length;
+      content = document.createTextNode(displayText);
+      builder.map.push(builder.pos, builder.pos + text.length, content);
+      if (ie && ie_version < 9) { mustWrap = true; }
+      builder.pos += text.length;
+    } else {
+      content = document.createDocumentFragment();
+      var pos = 0;
+      while (true) {
+        special.lastIndex = pos;
+        var m = special.exec(text);
+        var skipped = m ? m.index - pos : text.length - pos;
+        if (skipped) {
+          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
+          if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])); }
+          else { content.appendChild(txt); }
+          builder.map.push(builder.pos, builder.pos + skipped, txt);
+          builder.col += skipped;
+          builder.pos += skipped;
+        }
+        if (!m) { break }
+        pos += skipped + 1;
+        var txt$1 = (void 0);
+        if (m[0] == "\t") {
+          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
+          txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
+          txt$1.setAttribute("role", "presentation");
+          txt$1.setAttribute("cm-text", "\t");
+          builder.col += tabWidth;
+        } else if (m[0] == "\r" || m[0] == "\n") {
+          txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
+          txt$1.setAttribute("cm-text", m[0]);
+          builder.col += 1;
+        } else {
+          txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
+          txt$1.setAttribute("cm-text", m[0]);
+          if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])); }
+          else { content.appendChild(txt$1); }
+          builder.col += 1;
+        }
+        builder.map.push(builder.pos, builder.pos + 1, txt$1);
+        builder.pos++;
+      }
+    }
+    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
+    if (style || startStyle || endStyle || mustWrap || css || attributes) {
+      var fullStyle = style || "";
+      if (startStyle) { fullStyle += startStyle; }
+      if (endStyle) { fullStyle += endStyle; }
+      var token = elt("span", [content], fullStyle, css);
+      if (attributes) {
+        for (var attr in attributes) { if (attributes.hasOwnProperty(attr) && attr != "style" && attr != "class")
+          { token.setAttribute(attr, attributes[attr]); } }
+      }
+      return builder.content.appendChild(token)
+    }
+    builder.content.appendChild(content);
+  }
+
+  // Change some spaces to NBSP to prevent the browser from collapsing
+  // trailing spaces at the end of a line when rendering text (issue #1362).
+  function splitSpaces(text, trailingBefore) {
+    if (text.length > 1 && !/  /.test(text)) { return text }
+    var spaceBefore = trailingBefore, result = "";
+    for (var i = 0; i < text.length; i++) {
+      var ch = text.charAt(i);
+      if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
+        { ch = "\u00a0"; }
+      result += ch;
+      spaceBefore = ch == " ";
+    }
+    return result
+  }
+
+  // Work around nonsense dimensions being reported for stretches of
+  // right-to-left text.
+  function buildTokenBadBidi(inner, order) {
+    return function (builder, text, style, startStyle, endStyle, css, attributes) {
+      style = style ? style + " cm-force-border" : "cm-force-border";
+      var start = builder.pos, end = start + text.length;
+      for (;;) {
+        // Find the part that overlaps with the start of this text
+        var part = (void 0);
+        for (var i = 0; i < order.length; i++) {
+          part = order[i];
+          if (part.to > start && part.from <= start) { break }
+        }
+        if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }
+        inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);
+        startStyle = null;
+        text = text.slice(part.to - start);
+        start = part.to;
+      }
+    }
+  }
+
+  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
+    var widget = !ignoreWidget && marker.widgetNode;
+    if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }
+    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
+      if (!widget)
+        { widget = builder.content.appendChild(document.createElement("span")); }
+      widget.setAttribute("cm-marker", marker.id);
+    }
+    if (widget) {
+      builder.cm.display.input.setUneditable(widget);
+      builder.content.appendChild(widget);
+    }
+    builder.pos += size;
+    builder.trailingSpace = false;
+  }
+
+  // Outputs a number of spans to make up a line, taking highlighting
+  // and marked text into account.
+  function insertLineContent(line, builder, styles) {
+    var spans = line.markedSpans, allText = line.text, at = 0;
+    if (!spans) {
+      for (var i$1 = 1; i$1 < styles.length; i$1+=2)
+        { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }
+      return
+    }
+
+    var len = allText.length, pos = 0, i = 1, text = "", style, css;
+    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;
+    for (;;) {
+      if (nextChange == pos) { // Update current marker set
+        spanStyle = spanEndStyle = spanStartStyle = css = "";
+        attributes = null;
+        collapsed = null; nextChange = Infinity;
+        var foundBookmarks = [], endStyles = (void 0);
+        for (var j = 0; j < spans.length; ++j) {
+          var sp = spans[j], m = sp.marker;
+          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
+            foundBookmarks.push(m);
+          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
+            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
+              nextChange = sp.to;
+              spanEndStyle = "";
+            }
+            if (m.className) { spanStyle += " " + m.className; }
+            if (m.css) { css = (css ? css + ";" : "") + m.css; }
+            if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle; }
+            if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }
+            // support for the old title property
+            // https://github.com/codemirror/CodeMirror/pull/5673
+            if (m.title) { (attributes || (attributes = {})).title = m.title; }
+            if (m.attributes) {
+              for (var attr in m.attributes)
+                { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }
+            }
+            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
+              { collapsed = sp; }
+          } else if (sp.from > pos && nextChange > sp.from) {
+            nextChange = sp.from;
+          }
+        }
+        if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
+          { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1]; } } }
+
+        if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
+          { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }
+        if (collapsed && (collapsed.from || 0) == pos) {
+          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
+                             collapsed.marker, collapsed.from == null);
+          if (collapsed.to == null) { return }
+          if (collapsed.to == pos) { collapsed = false; }
+        }
+      }
+      if (pos >= len) { break }
+
+      var upto = Math.min(len, nextChange);
+      while (true) {
+        if (text) {
+          var end = pos + text.length;
+          if (!collapsed) {
+            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
+            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
+                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", css, attributes);
+          }
+          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
+          pos = end;
+          spanStartStyle = "";
+        }
+        text = allText.slice(at, at = styles[i++]);
+        style = interpretTokenStyle(styles[i++], builder.cm.options);
+      }
+    }
+  }
+
+
+  // These objects are used to represent the visible (currently drawn)
+  // part of the document. A LineView may correspond to multiple
+  // logical lines, if those are connected by collapsed ranges.
+  function LineView(doc, line, lineN) {
+    // The starting line
+    this.line = line;
+    // Continuing lines, if any
+    this.rest = visualLineContinued(line);
+    // Number of logical lines in this visual line
+    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
+    this.node = this.text = null;
+    this.hidden = lineIsHidden(doc, line);
+  }
+
+  // Create a range of LineView objects for the given lines.
+  function buildViewArray(cm, from, to) {
+    var array = [], nextPos;
+    for (var pos = from; pos < to; pos = nextPos) {
+      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
+      nextPos = pos + view.size;
+      array.push(view);
+    }
+    return array
+  }
+
+  var operationGroup = null;
+
+  function pushOperation(op) {
+    if (operationGroup) {
+      operationGroup.ops.push(op);
+    } else {
+      op.ownsGroup = operationGroup = {
+        ops: [op],
+        delayedCallbacks: []
+      };
+    }
+  }
+
+  function fireCallbacksForOps(group) {
+    // Calls delayed callbacks and cursorActivity handlers until no
+    // new ones appear
+    var callbacks = group.delayedCallbacks, i = 0;
+    do {
+      for (; i < callbacks.length; i++)
+        { callbacks[i].call(null); }
+      for (var j = 0; j < group.ops.length; j++) {
+        var op = group.ops[j];
+        if (op.cursorActivityHandlers)
+          { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
+            { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }
+      }
+    } while (i < callbacks.length)
+  }
+
+  function finishOperation(op, endCb) {
+    var group = op.ownsGroup;
+    if (!group) { return }
+
+    try { fireCallbacksForOps(group); }
+    finally {
+      operationGroup = null;
+      endCb(group);
+    }
+  }
+
+  var orphanDelayedCallbacks = null;
+
+  // Often, we want to signal events at a point where we are in the
+  // middle of some work, but don't want the handler to start calling
+  // other methods on the editor, which might be in an inconsistent
+  // state or simply not expect any other events to happen.
+  // signalLater looks whether there are any handlers, and schedules
+  // them to be executed when the last operation ends, or, if no
+  // operation is active, when a timeout fires.
+  function signalLater(emitter, type /*, values...*/) {
+    var arr = getHandlers(emitter, type);
+    if (!arr.length) { return }
+    var args = Array.prototype.slice.call(arguments, 2), list;
+    if (operationGroup) {
+      list = operationGroup.delayedCallbacks;
+    } else if (orphanDelayedCallbacks) {
+      list = orphanDelayedCallbacks;
+    } else {
+      list = orphanDelayedCallbacks = [];
+      setTimeout(fireOrphanDelayed, 0);
+    }
+    var loop = function ( i ) {
+      list.push(function () { return arr[i].apply(null, args); });
+    };
+
+    for (var i = 0; i < arr.length; ++i)
+      loop( i );
+  }
+
+  function fireOrphanDelayed() {
+    var delayed = orphanDelayedCallbacks;
+    orphanDelayedCallbacks = null;
+    for (var i = 0; i < delayed.length; ++i) { delayed[i](); }
+  }
+
+  // When an aspect of a line changes, a string is added to
+  // lineView.changes. This updates the relevant part of the line's
+  // DOM structure.
+  function updateLineForChanges(cm, lineView, lineN, dims) {
+    for (var j = 0; j < lineView.changes.length; j++) {
+      var type = lineView.changes[j];
+      if (type == "text") { updateLineText(cm, lineView); }
+      else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims); }
+      else if (type == "class") { updateLineClasses(cm, lineView); }
+      else if (type == "widget") { updateLineWidgets(cm, lineView, dims); }
+    }
+    lineView.changes = null;
+  }
+
+  // Lines with gutter elements, widgets or a background class need to
+  // be wrapped, and have the extra elements added to the wrapper div
+  function ensureLineWrapped(lineView) {
+    if (lineView.node == lineView.text) {
+      lineView.node = elt("div", null, null, "position: relative");
+      if (lineView.text.parentNode)
+        { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }
+      lineView.node.appendChild(lineView.text);
+      if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }
+    }
+    return lineView.node
+  }
+
+  function updateLineBackground(cm, lineView) {
+    var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
+    if (cls) { cls += " CodeMirror-linebackground"; }
+    if (lineView.background) {
+      if (cls) { lineView.background.className = cls; }
+      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
+    } else if (cls) {
+      var wrap = ensureLineWrapped(lineView);
+      lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
+      cm.display.input.setUneditable(lineView.background);
+    }
+  }
+
+  // Wrapper around buildLineContent which will reuse the structure
+  // in display.externalMeasured when possible.
+  function getLineContent(cm, lineView) {
+    var ext = cm.display.externalMeasured;
+    if (ext && ext.line == lineView.line) {
+      cm.display.externalMeasured = null;
+      lineView.measure = ext.measure;
+      return ext.built
+    }
+    return buildLineContent(cm, lineView)
+  }
+
+  // Redraw the line's text. Interacts with the background and text
+  // classes because the mode may output tokens that influence these
+  // classes.
+  function updateLineText(cm, lineView) {
+    var cls = lineView.text.className;
+    var built = getLineContent(cm, lineView);
+    if (lineView.text == lineView.node) { lineView.node = built.pre; }
+    lineView.text.parentNode.replaceChild(built.pre, lineView.text);
+    lineView.text = built.pre;
+    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
+      lineView.bgClass = built.bgClass;
+      lineView.textClass = built.textClass;
+      updateLineClasses(cm, lineView);
+    } else if (cls) {
+      lineView.text.className = cls;
+    }
+  }
+
+  function updateLineClasses(cm, lineView) {
+    updateLineBackground(cm, lineView);
+    if (lineView.line.wrapClass)
+      { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }
+    else if (lineView.node != lineView.text)
+      { lineView.node.className = ""; }
+    var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
+    lineView.text.className = textClass || "";
+  }
+
+  function updateLineGutter(cm, lineView, lineN, dims) {
+    if (lineView.gutter) {
+      lineView.node.removeChild(lineView.gutter);
+      lineView.gutter = null;
+    }
+    if (lineView.gutterBackground) {
+      lineView.node.removeChild(lineView.gutterBackground);
+      lineView.gutterBackground = null;
+    }
+    if (lineView.line.gutterClass) {
+      var wrap = ensureLineWrapped(lineView);
+      lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
+                                      ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
+      cm.display.input.setUneditable(lineView.gutterBackground);
+      wrap.insertBefore(lineView.gutterBackground, lineView.text);
+    }
+    var markers = lineView.line.gutterMarkers;
+    if (cm.options.lineNumbers || markers) {
+      var wrap$1 = ensureLineWrapped(lineView);
+      var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
+      gutterWrap.setAttribute("aria-hidden", "true");
+      cm.display.input.setUneditable(gutterWrap);
+      wrap$1.insertBefore(gutterWrap, lineView.text);
+      if (lineView.line.gutterClass)
+        { gutterWrap.className += " " + lineView.line.gutterClass; }
+      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
+        { lineView.lineNumber = gutterWrap.appendChild(
+          elt("div", lineNumberFor(cm.options, lineN),
+              "CodeMirror-linenumber CodeMirror-gutter-elt",
+              ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))); }
+      if (markers) { for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {
+        var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];
+        if (found)
+          { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
+                                     ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))); }
+      } }
+    }
+  }
+
+  function updateLineWidgets(cm, lineView, dims) {
+    if (lineView.alignable) { lineView.alignable = null; }
+    var isWidget = classTest("CodeMirror-linewidget");
+    for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
+      next = node.nextSibling;
+      if (isWidget.test(node.className)) { lineView.node.removeChild(node); }
+    }
+    insertLineWidgets(cm, lineView, dims);
+  }
+
+  // Build a line's DOM representation from scratch
+  function buildLineElement(cm, lineView, lineN, dims) {
+    var built = getLineContent(cm, lineView);
+    lineView.text = lineView.node = built.pre;
+    if (built.bgClass) { lineView.bgClass = built.bgClass; }
+    if (built.textClass) { lineView.textClass = built.textClass; }
+
+    updateLineClasses(cm, lineView);
+    updateLineGutter(cm, lineView, lineN, dims);
+    insertLineWidgets(cm, lineView, dims);
+    return lineView.node
+  }
+
+  // A lineView may contain multiple logical lines (when merged by
+  // collapsed spans). The widgets for all of them need to be drawn.
+  function insertLineWidgets(cm, lineView, dims) {
+    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
+    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
+      { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }
+  }
+
+  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
+    if (!line.widgets) { return }
+    var wrap = ensureLineWrapped(lineView);
+    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
+      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget" + (widget.className ? " " + widget.className : ""));
+      if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true"); }
+      positionLineWidget(widget, node, lineView, dims);
+      cm.display.input.setUneditable(node);
+      if (allowAbove && widget.above)
+        { wrap.insertBefore(node, lineView.gutter || lineView.text); }
+      else
+        { wrap.appendChild(node); }
+      signalLater(widget, "redraw");
+    }
+  }
+
+  function positionLineWidget(widget, node, lineView, dims) {
+    if (widget.noHScroll) {
+  (lineView.alignable || (lineView.alignable = [])).push(node);
+      var width = dims.wrapperWidth;
+      node.style.left = dims.fixedPos + "px";
+      if (!widget.coverGutter) {
+        width -= dims.gutterTotalWidth;
+        node.style.paddingLeft = dims.gutterTotalWidth + "px";
+      }
+      node.style.width = width + "px";
+    }
+    if (widget.coverGutter) {
+      node.style.zIndex = 5;
+      node.style.position = "relative";
+      if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px"; }
+    }
+  }
+
+  function widgetHeight(widget) {
+    if (widget.height != null) { return widget.height }
+    var cm = widget.doc.cm;
+    if (!cm) { return 0 }
+    if (!contains(document.body, widget.node)) {
+      var parentStyle = "position: relative;";
+      if (widget.coverGutter)
+        { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;"; }
+      if (widget.noHScroll)
+        { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;"; }
+      removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
+    }
+    return widget.height = widget.node.parentNode.offsetHeight
+  }
+
+  // Return true when the given mouse event happened in a widget
+  function eventInWidget(display, e) {
+    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
+      if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
+          (n.parentNode == display.sizer && n != display.mover))
+        { return true }
+    }
+  }
+
+  // POSITION MEASUREMENT
+
+  function paddingTop(display) {return display.lineSpace.offsetTop}
+  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
+  function paddingH(display) {
+    if (display.cachedPaddingH) { return display.cachedPaddingH }
+    var e = removeChildrenAndAdd(display.measure, elt("pre", "x", "CodeMirror-line-like"));
+    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
+    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
+    if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }
+    return data
+  }
+
+  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
+  function displayWidth(cm) {
+    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
+  }
+  function displayHeight(cm) {
+    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
+  }
+
+  // Ensure the lineView.wrapping.heights array is populated. This is
+  // an array of bottom offsets for the lines that make up a drawn
+  // line. When lineWrapping is on, there might be more than one
+  // height.
+  function ensureLineHeights(cm, lineView, rect) {
+    var wrapping = cm.options.lineWrapping;
+    var curWidth = wrapping && displayWidth(cm);
+    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
+      var heights = lineView.measure.heights = [];
+      if (wrapping) {
+        lineView.measure.width = curWidth;
+        var rects = lineView.text.firstChild.getClientRects();
+        for (var i = 0; i < rects.length - 1; i++) {
+          var cur = rects[i], next = rects[i + 1];
+          if (Math.abs(cur.bottom - next.bottom) > 2)
+            { heights.push((cur.bottom + next.top) / 2 - rect.top); }
+        }
+      }
+      heights.push(rect.bottom - rect.top);
+    }
+  }
+
+  // Find a line map (mapping character offsets to text nodes) and a
+  // measurement cache for the given line number. (A line view might
+  // contain multiple lines when collapsed ranges are present.)
+  function mapFromLineView(lineView, line, lineN) {
+    if (lineView.line == line)
+      { return {map: lineView.measure.map, cache: lineView.measure.cache} }
+    if (lineView.rest) {
+      for (var i = 0; i < lineView.rest.length; i++)
+        { if (lineView.rest[i] == line)
+          { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
+      for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
+        { if (lineNo(lineView.rest[i$1]) > lineN)
+          { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
+    }
+  }
+
+  // Render a line into the hidden node display.externalMeasured. Used
+  // when measurement is needed for a line that's not in the viewport.
+  function updateExternalMeasurement(cm, line) {
+    line = visualLine(line);
+    var lineN = lineNo(line);
+    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
+    view.lineN = lineN;
+    var built = view.built = buildLineContent(cm, view);
+    view.text = built.pre;
+    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
+    return view
+  }
+
+  // Get a {top, bottom, left, right} box (in line-local coordinates)
+  // for a given character.
+  function measureChar(cm, line, ch, bias) {
+    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
+  }
+
+  // Find a line view that corresponds to the given line number.
+  function findViewForLine(cm, lineN) {
+    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
+      { return cm.display.view[findViewIndex(cm, lineN)] }
+    var ext = cm.display.externalMeasured;
+    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
+      { return ext }
+  }
+
+  // Measurement can be split in two steps, the set-up work that
+  // applies to the whole line, and the measurement of the actual
+  // character. Functions like coordsChar, that need to do a lot of
+  // measurements in a row, can thus ensure that the set-up work is
+  // only done once.
+  function prepareMeasureForLine(cm, line) {
+    var lineN = lineNo(line);
+    var view = findViewForLine(cm, lineN);
+    if (view && !view.text) {
+      view = null;
+    } else if (view && view.changes) {
+      updateLineForChanges(cm, view, lineN, getDimensions(cm));
+      cm.curOp.forceUpdate = true;
+    }
+    if (!view)
+      { view = updateExternalMeasurement(cm, line); }
+
+    var info = mapFromLineView(view, line, lineN);
+    return {
+      line: line, view: view, rect: null,
+      map: info.map, cache: info.cache, before: info.before,
+      hasHeights: false
+    }
+  }
+
+  // Given a prepared measurement object, measures the position of an
+  // actual character (or fetches it from the cache).
+  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
+    if (prepared.before) { ch = -1; }
+    var key = ch + (bias || ""), found;
+    if (prepared.cache.hasOwnProperty(key)) {
+      found = prepared.cache[key];
+    } else {
+      if (!prepared.rect)
+        { prepared.rect = prepared.view.text.getBoundingClientRect(); }
+      if (!prepared.hasHeights) {
+        ensureLineHeights(cm, prepared.view, prepared.rect);
+        prepared.hasHeights = true;
+      }
+      found = measureCharInner(cm, prepared, ch, bias);
+      if (!found.bogus) { prepared.cache[key] = found; }
+    }
+    return {left: found.left, right: found.right,
+            top: varHeight ? found.rtop : found.top,
+            bottom: varHeight ? found.rbottom : found.bottom}
+  }
+
+  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
+
+  function nodeAndOffsetInLineMap(map, ch, bias) {
+    var node, start, end, collapse, mStart, mEnd;
+    // First, search the line map for the text node corresponding to,
+    // or closest to, the target character.
+    for (var i = 0; i < map.length; i += 3) {
+      mStart = map[i];
+      mEnd = map[i + 1];
+      if (ch < mStart) {
+        start = 0; end = 1;
+        collapse = "left";
+      } else if (ch < mEnd) {
+        start = ch - mStart;
+        end = start + 1;
+      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
+        end = mEnd - mStart;
+        start = end - 1;
+        if (ch >= mEnd) { collapse = "right"; }
+      }
+      if (start != null) {
+        node = map[i + 2];
+        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
+          { collapse = bias; }
+        if (bias == "left" && start == 0)
+          { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
+            node = map[(i -= 3) + 2];
+            collapse = "left";
+          } }
+        if (bias == "right" && start == mEnd - mStart)
+          { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
+            node = map[(i += 3) + 2];
+            collapse = "right";
+          } }
+        break
+      }
+    }
+    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
+  }
+
+  function getUsefulRect(rects, bias) {
+    var rect = nullRect;
+    if (bias == "left") { for (var i = 0; i < rects.length; i++) {
+      if ((rect = rects[i]).left != rect.right) { break }
+    } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
+      if ((rect = rects[i$1]).left != rect.right) { break }
+    } }
+    return rect
+  }
+
+  function measureCharInner(cm, prepared, ch, bias) {
+    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
+    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;
+
+    var rect;
+    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
+      for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
+        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }
+        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }
+        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
+          { rect = node.parentNode.getBoundingClientRect(); }
+        else
+          { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }
+        if (rect.left || rect.right || start == 0) { break }
+        end = start;
+        start = start - 1;
+        collapse = "right";
+      }
+      if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }
+    } else { // If it is a widget, simply get the box for the whole widget.
+      if (start > 0) { collapse = bias = "right"; }
+      var rects;
+      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
+        { rect = rects[bias == "right" ? rects.length - 1 : 0]; }
+      else
+        { rect = node.getBoundingClientRect(); }
+    }
+    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
+      var rSpan = node.parentNode.getClientRects()[0];
+      if (rSpan)
+        { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }
+      else
+        { rect = nullRect; }
+    }
+
+    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
+    var mid = (rtop + rbot) / 2;
+    var heights = prepared.view.measure.heights;
+    var i = 0;
+    for (; i < heights.length - 1; i++)
+      { if (mid < heights[i]) { break } }
+    var top = i ? heights[i - 1] : 0, bot = heights[i];
+    var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
+                  right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
+                  top: top, bottom: bot};
+    if (!rect.left && !rect.right) { result.bogus = true; }
+    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }
+
+    return result
+  }
+
+  // Work around problem with bounding client rects on ranges being
+  // returned incorrectly when zoomed on IE10 and below.
+  function maybeUpdateRectForZooming(measure, rect) {
+    if (!window.screen || screen.logicalXDPI == null ||
+        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
+      { return rect }
+    var scaleX = screen.logicalXDPI / screen.deviceXDPI;
+    var scaleY = screen.logicalYDPI / screen.deviceYDPI;
+    return {left: rect.left * scaleX, right: rect.right * scaleX,
+            top: rect.top * scaleY, bottom: rect.bottom * scaleY}
+  }
+
+  function clearLineMeasurementCacheFor(lineView) {
+    if (lineView.measure) {
+      lineView.measure.cache = {};
+      lineView.measure.heights = null;
+      if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
+        { lineView.measure.caches[i] = {}; } }
+    }
+  }
+
+  function clearLineMeasurementCache(cm) {
+    cm.display.externalMeasure = null;
+    removeChildren(cm.display.lineMeasure);
+    for (var i = 0; i < cm.display.view.length; i++)
+      { clearLineMeasurementCacheFor(cm.display.view[i]); }
+  }
+
+  function clearCaches(cm) {
+    clearLineMeasurementCache(cm);
+    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
+    if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }
+    cm.display.lineNumChars = null;
+  }
+
+  function pageScrollX() {
+    // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
+    // which causes page_Offset and bounding client rects to use
+    // different reference viewports and invalidate our calculations.
+    if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
+    return window.pageXOffset || (document.documentElement || document.body).scrollLeft
+  }
+  function pageScrollY() {
+    if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
+    return window.pageYOffset || (document.documentElement || document.body).scrollTop
+  }
+
+  function widgetTopHeight(lineObj) {
+    var ref = visualLine(lineObj);
+    var widgets = ref.widgets;
+    var height = 0;
+    if (widgets) { for (var i = 0; i < widgets.length; ++i) { if (widgets[i].above)
+      { height += widgetHeight(widgets[i]); } } }
+    return height
+  }
+
+  // Converts a {top, bottom, left, right} box from line-local
+  // coordinates into another coordinate system. Context may be one of
+  // "line", "div" (display.lineDiv), "local"./null (editor), "window",
+  // or "page".
+  function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
+    if (!includeWidgets) {
+      var height = widgetTopHeight(lineObj);
+      rect.top += height; rect.bottom += height;
+    }
+    if (context == "line") { return rect }
+    if (!context) { context = "local"; }
+    var yOff = heightAtLine(lineObj);
+    if (context == "local") { yOff += paddingTop(cm.display); }
+    else { yOff -= cm.display.viewOffset; }
+    if (context == "page" || context == "window") {
+      var lOff = cm.display.lineSpace.getBoundingClientRect();
+      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
+      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
+      rect.left += xOff; rect.right += xOff;
+    }
+    rect.top += yOff; rect.bottom += yOff;
+    return rect
+  }
+
+  // Coverts a box from "div" coords to another coordinate system.
+  // Context may be "window", "page", "div", or "local"./null.
+  function fromCoordSystem(cm, coords, context) {
+    if (context == "div") { return coords }
+    var left = coords.left, top = coords.top;
+    // First move into "page" coordinate system
+    if (context == "page") {
+      left -= pageScrollX();
+      top -= pageScrollY();
+    } else if (context == "local" || !context) {
+      var localBox = cm.display.sizer.getBoundingClientRect();
+      left += localBox.left;
+      top += localBox.top;
+    }
+
+    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
+    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
+  }
+
+  function charCoords(cm, pos, context, lineObj, bias) {
+    if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }
+    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
+  }
+
+  // Returns a box for a given cursor position, which may have an
+  // 'other' property containing the position of the secondary cursor
+  // on a bidi boundary.
+  // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
+  // and after `char - 1` in writing order of `char - 1`
+  // A cursor Pos(line, char, "after") is on the same visual line as `char`
+  // and before `char` in writing order of `char`
+  // Examples (upper-case letters are RTL, lower-case are LTR):
+  //     Pos(0, 1, ...)
+  //     before   after
+  // ab     a|b     a|b
+  // aB     a|B     aB|
+  // Ab     |Ab     A|b
+  // AB     B|A     B|A
+  // Every position after the last character on a line is considered to stick
+  // to the last character on the line.
+  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
+    lineObj = lineObj || getLine(cm.doc, pos.line);
+    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
+    function get(ch, right) {
+      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
+      if (right) { m.left = m.right; } else { m.right = m.left; }
+      return intoCoordSystem(cm, lineObj, m, context)
+    }
+    var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
+    if (ch >= lineObj.text.length) {
+      ch = lineObj.text.length;
+      sticky = "before";
+    } else if (ch <= 0) {
+      ch = 0;
+      sticky = "after";
+    }
+    if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }
+
+    function getBidi(ch, partPos, invert) {
+      var part = order[partPos], right = part.level == 1;
+      return get(invert ? ch - 1 : ch, right != invert)
+    }
+    var partPos = getBidiPartAt(order, ch, sticky);
+    var other = bidiOther;
+    var val = getBidi(ch, partPos, sticky == "before");
+    if (other != null) { val.other = getBidi(ch, other, sticky != "before"); }
+    return val
+  }
+
+  // Used to cheaply estimate the coordinates for a position. Used for
+  // intermediate scroll updates.
+  function estimateCoords(cm, pos) {
+    var left = 0;
+    pos = clipPos(cm.doc, pos);
+    if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }
+    var lineObj = getLine(cm.doc, pos.line);
+    var top = heightAtLine(lineObj) + paddingTop(cm.display);
+    return {left: left, right: left, top: top, bottom: top + lineObj.height}
+  }
+
+  // Positions returned by coordsChar contain some extra information.
+  // xRel is the relative x position of the input coordinates compared
+  // to the found position (so xRel > 0 means the coordinates are to
+  // the right of the character position, for example). When outside
+  // is true, that means the coordinates lie outside the line's
+  // vertical range.
+  function PosWithInfo(line, ch, sticky, outside, xRel) {
+    var pos = Pos(line, ch, sticky);
+    pos.xRel = xRel;
+    if (outside) { pos.outside = outside; }
+    return pos
+  }
+
+  // Compute the character position closest to the given coordinates.
+  // Input must be lineSpace-local ("div" coordinate system).
+  function coordsChar(cm, x, y) {
+    var doc = cm.doc;
+    y += cm.display.viewOffset;
+    if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }
+    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
+    if (lineN > last)
+      { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }
+    if (x < 0) { x = 0; }
+
+    var lineObj = getLine(doc, lineN);
+    for (;;) {
+      var found = coordsCharInner(cm, lineObj, lineN, x, y);
+      var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));
+      if (!collapsed) { return found }
+      var rangeEnd = collapsed.find(1);
+      if (rangeEnd.line == lineN) { return rangeEnd }
+      lineObj = getLine(doc, lineN = rangeEnd.line);
+    }
+  }
+
+  function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
+    y -= widgetTopHeight(lineObj);
+    var end = lineObj.text.length;
+    var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);
+    end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);
+    return {begin: begin, end: end}
+  }
+
+  function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
+    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
+    var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
+    return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
+  }
+
+  // Returns true if the given side of a box is after the given
+  // coordinates, in top-to-bottom, left-to-right order.
+  function boxIsAfter(box, x, y, left) {
+    return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
+  }
+
+  function coordsCharInner(cm, lineObj, lineNo, x, y) {
+    // Move y into line-local coordinate space
+    y -= heightAtLine(lineObj);
+    var preparedMeasure = prepareMeasureForLine(cm, lineObj);
+    // When directly calling `measureCharPrepared`, we have to adjust
+    // for the widgets at this line.
+    var widgetHeight = widgetTopHeight(lineObj);
+    var begin = 0, end = lineObj.text.length, ltr = true;
+
+    var order = getOrder(lineObj, cm.doc.direction);
+    // If the line isn't plain left-to-right text, first figure out
+    // which bidi section the coordinates fall into.
+    if (order) {
+      var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
+                   (cm, lineObj, lineNo, preparedMeasure, order, x, y);
+      ltr = part.level != 1;
+      // The awkward -1 offsets are needed because findFirst (called
+      // on these below) will treat its first bound as inclusive,
+      // second as exclusive, but we want to actually address the
+      // characters in the part's range
+      begin = ltr ? part.from : part.to - 1;
+      end = ltr ? part.to : part.from - 1;
+    }
+
+    // A binary search to find the first character whose bounding box
+    // starts after the coordinates. If we run across any whose box wrap
+    // the coordinates, store that.
+    var chAround = null, boxAround = null;
+    var ch = findFirst(function (ch) {
+      var box = measureCharPrepared(cm, preparedMeasure, ch);
+      box.top += widgetHeight; box.bottom += widgetHeight;
+      if (!boxIsAfter(box, x, y, false)) { return false }
+      if (box.top <= y && box.left <= x) {
+        chAround = ch;
+        boxAround = box;
+      }
+      return true
+    }, begin, end);
+
+    var baseX, sticky, outside = false;
+    // If a box around the coordinates was found, use that
+    if (boxAround) {
+      // Distinguish coordinates nearer to the left or right side of the box
+      var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;
+      ch = chAround + (atStart ? 0 : 1);
+      sticky = atStart ? "after" : "before";
+      baseX = atLeft ? boxAround.left : boxAround.right;
+    } else {
+      // (Adjust for extended bound, if necessary.)
+      if (!ltr && (ch == end || ch == begin)) { ch++; }
+      // To determine which side to associate with, get the box to the
+      // left of the character and compare it's vertical position to the
+      // coordinates
+      sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
+        (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
+        "after" : "before";
+      // Now get accurate coordinates for this place, in order to get a
+      // base X position
+      var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure);
+      baseX = coords.left;
+      outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;
+    }
+
+    ch = skipExtendingChars(lineObj.text, ch, 1);
+    return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
+  }
+
+  function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
+    // Bidi parts are sorted left-to-right, and in a non-line-wrapping
+    // situation, we can take this ordering to correspond to the visual
+    // ordering. This finds the first part whose end is after the given
+    // coordinates.
+    var index = findFirst(function (i) {
+      var part = order[i], ltr = part.level != 1;
+      return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
+                                     "line", lineObj, preparedMeasure), x, y, true)
+    }, 0, order.length - 1);
+    var part = order[index];
+    // If this isn't the first part, the part's start is also after
+    // the coordinates, and the coordinates aren't on the same line as
+    // that start, move one part back.
+    if (index > 0) {
+      var ltr = part.level != 1;
+      var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
+                               "line", lineObj, preparedMeasure);
+      if (boxIsAfter(start, x, y, true) && start.top > y)
+        { part = order[index - 1]; }
+    }
+    return part
+  }
+
+  function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
+    // In a wrapped line, rtl text on wrapping boundaries can do things
+    // that don't correspond to the ordering in our `order` array at
+    // all, so a binary search doesn't work, and we want to return a
+    // part that only spans one line so that the binary search in
+    // coordsCharInner is safe. As such, we first find the extent of the
+    // wrapped line, and then do a flat search in which we discard any
+    // spans that aren't on the line.
+    var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
+    var begin = ref.begin;
+    var end = ref.end;
+    if (/\s/.test(lineObj.text.charAt(end - 1))) { end--; }
+    var part = null, closestDist = null;
+    for (var i = 0; i < order.length; i++) {
+      var p = order[i];
+      if (p.from >= end || p.to <= begin) { continue }
+      var ltr = p.level != 1;
+      var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
+      // Weigh against spans ending before this, so that they are only
+      // picked if nothing ends after
+      var dist = endX < x ? x - endX + 1e9 : endX - x;
+      if (!part || closestDist > dist) {
+        part = p;
+        closestDist = dist;
+      }
+    }
+    if (!part) { part = order[order.length - 1]; }
+    // Clip the part to the wrapped line.
+    if (part.from < begin) { part = {from: begin, to: part.to, level: part.level}; }
+    if (part.to > end) { part = {from: part.from, to: end, level: part.level}; }
+    return part
+  }
+
+  var measureText;
+  // Compute the default text height.
+  function textHeight(display) {
+    if (display.cachedTextHeight != null) { return display.cachedTextHeight }
+    if (measureText == null) {
+      measureText = elt("pre", null, "CodeMirror-line-like");
+      // Measure a bunch of lines, for browsers that compute
+      // fractional heights.
+      for (var i = 0; i < 49; ++i) {
+        measureText.appendChild(document.createTextNode("x"));
+        measureText.appendChild(elt("br"));
+      }
+      measureText.appendChild(document.createTextNode("x"));
+    }
+    removeChildrenAndAdd(display.measure, measureText);
+    var height = measureText.offsetHeight / 50;
+    if (height > 3) { display.cachedTextHeight = height; }
+    removeChildren(display.measure);
+    return height || 1
+  }
+
+  // Compute the default character width.
+  function charWidth(display) {
+    if (display.cachedCharWidth != null) { return display.cachedCharWidth }
+    var anchor = elt("span", "xxxxxxxxxx");
+    var pre = elt("pre", [anchor], "CodeMirror-line-like");
+    removeChildrenAndAdd(display.measure, pre);
+    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
+    if (width > 2) { display.cachedCharWidth = width; }
+    return width || 10
+  }
+
+  // Do a bulk-read of the DOM positions and sizes needed to draw the
+  // view, so that we don't interleave reading and writing to the DOM.
+  function getDimensions(cm) {
+    var d = cm.display, left = {}, width = {};
+    var gutterLeft = d.gutters.clientLeft;
+    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
+      var id = cm.display.gutterSpecs[i].className;
+      left[id] = n.offsetLeft + n.clientLeft + gutterLeft;
+      width[id] = n.clientWidth;
+    }
+    return {fixedPos: compensateForHScroll(d),
+            gutterTotalWidth: d.gutters.offsetWidth,
+            gutterLeft: left,
+            gutterWidth: width,
+            wrapperWidth: d.wrapper.clientWidth}
+  }
+
+  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
+  // but using getBoundingClientRect to get a sub-pixel-accurate
+  // result.
+  function compensateForHScroll(display) {
+    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
+  }
+
+  // Returns a function that estimates the height of a line, to use as
+  // first approximation until the line becomes visible (and is thus
+  // properly measurable).
+  function estimateHeight(cm) {
+    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
+    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
+    return function (line) {
+      if (lineIsHidden(cm.doc, line)) { return 0 }
+
+      var widgetsHeight = 0;
+      if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
+        if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }
+      } }
+
+      if (wrapping)
+        { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
+      else
+        { return widgetsHeight + th }
+    }
+  }
+
+  function estimateLineHeights(cm) {
+    var doc = cm.doc, est = estimateHeight(cm);
+    doc.iter(function (line) {
+      var estHeight = est(line);
+      if (estHeight != line.height) { updateLineHeight(line, estHeight); }
+    });
+  }
+
+  // Given a mouse event, find the corresponding position. If liberal
+  // is false, it checks whether a gutter or scrollbar was clicked,
+  // and returns null if it was. forRect is used by rectangular
+  // selections, and tries to estimate a character position even for
+  // coordinates beyond the right of the text.
+  function posFromMouse(cm, e, liberal, forRect) {
+    var display = cm.display;
+    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }
+
+    var x, y, space = display.lineSpace.getBoundingClientRect();
+    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+    try { x = e.clientX - space.left; y = e.clientY - space.top; }
+    catch (e$1) { return null }
+    var coords = coordsChar(cm, x, y), line;
+    if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
+      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
+      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
+    }
+    return coords
+  }
+
+  // Find the view element corresponding to a given line. Return null
+  // when the line isn't visible.
+  function findViewIndex(cm, n) {
+    if (n >= cm.display.viewTo) { return null }
+    n -= cm.display.viewFrom;
+    if (n < 0) { return null }
+    var view = cm.display.view;
+    for (var i = 0; i < view.length; i++) {
+      n -= view[i].size;
+      if (n < 0) { return i }
+    }
+  }
+
+  // Updates the display.view data structure for a given change to the
+  // document. From and to are in pre-change coordinates. Lendiff is
+  // the amount of lines added or subtracted by the change. This is
+  // used for changes that span multiple lines, or change the way
+  // lines are divided into visual lines. regLineChange (below)
+  // registers single-line changes.
+  function regChange(cm, from, to, lendiff) {
+    if (from == null) { from = cm.doc.first; }
+    if (to == null) { to = cm.doc.first + cm.doc.size; }
+    if (!lendiff) { lendiff = 0; }
+
+    var display = cm.display;
+    if (lendiff && to < display.viewTo &&
+        (display.updateLineNumbers == null || display.updateLineNumbers > from))
+      { display.updateLineNumbers = from; }
+
+    cm.curOp.viewChanged = true;
+
+    if (from >= display.viewTo) { // Change after
+      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
+        { resetView(cm); }
+    } else if (to <= display.viewFrom) { // Change before
+      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
+        resetView(cm);
+      } else {
+        display.viewFrom += lendiff;
+        display.viewTo += lendiff;
+      }
+    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
+      resetView(cm);
+    } else if (from <= display.viewFrom) { // Top overlap
+      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
+      if (cut) {
+        display.view = display.view.slice(cut.index);
+        display.viewFrom = cut.lineN;
+        display.viewTo += lendiff;
+      } else {
+        resetView(cm);
+      }
+    } else if (to >= display.viewTo) { // Bottom overlap
+      var cut$1 = viewCuttingPoint(cm, from, from, -1);
+      if (cut$1) {
+        display.view = display.view.slice(0, cut$1.index);
+        display.viewTo = cut$1.lineN;
+      } else {
+        resetView(cm);
+      }
+    } else { // Gap in the middle
+      var cutTop = viewCuttingPoint(cm, from, from, -1);
+      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
+      if (cutTop && cutBot) {
+        display.view = display.view.slice(0, cutTop.index)
+          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
+          .concat(display.view.slice(cutBot.index));
+        display.viewTo += lendiff;
+      } else {
+        resetView(cm);
+      }
+    }
+
+    var ext = display.externalMeasured;
+    if (ext) {
+      if (to < ext.lineN)
+        { ext.lineN += lendiff; }
+      else if (from < ext.lineN + ext.size)
+        { display.externalMeasured = null; }
+    }
+  }
+
+  // Register a change to a single line. Type must be one of "text",
+  // "gutter", "class", "widget"
+  function regLineChange(cm, line, type) {
+    cm.curOp.viewChanged = true;
+    var display = cm.display, ext = cm.display.externalMeasured;
+    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
+      { display.externalMeasured = null; }
+
+    if (line < display.viewFrom || line >= display.viewTo) { return }
+    var lineView = display.view[findViewIndex(cm, line)];
+    if (lineView.node == null) { return }
+    var arr = lineView.changes || (lineView.changes = []);
+    if (indexOf(arr, type) == -1) { arr.push(type); }
+  }
+
+  // Clear the view.
+  function resetView(cm) {
+    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
+    cm.display.view = [];
+    cm.display.viewOffset = 0;
+  }
+
+  function viewCuttingPoint(cm, oldN, newN, dir) {
+    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
+    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
+      { return {index: index, lineN: newN} }
+    var n = cm.display.viewFrom;
+    for (var i = 0; i < index; i++)
+      { n += view[i].size; }
+    if (n != oldN) {
+      if (dir > 0) {
+        if (index == view.length - 1) { return null }
+        diff = (n + view[index].size) - oldN;
+        index++;
+      } else {
+        diff = n - oldN;
+      }
+      oldN += diff; newN += diff;
+    }
+    while (visualLineNo(cm.doc, newN) != newN) {
+      if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
+      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
+      index += dir;
+    }
+    return {index: index, lineN: newN}
+  }
+
+  // Force the view to cover a given range, adding empty view element
+  // or clipping off existing ones as needed.
+  function adjustView(cm, from, to) {
+    var display = cm.display, view = display.view;
+    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
+      display.view = buildViewArray(cm, from, to);
+      display.viewFrom = from;
+    } else {
+      if (display.viewFrom > from)
+        { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }
+      else if (display.viewFrom < from)
+        { display.view = display.view.slice(findViewIndex(cm, from)); }
+      display.viewFrom = from;
+      if (display.viewTo < to)
+        { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }
+      else if (display.viewTo > to)
+        { display.view = display.view.slice(0, findViewIndex(cm, to)); }
+    }
+    display.viewTo = to;
+  }
+
+  // Count the number of lines in the view whose DOM representation is
+  // out of date (or nonexistent).
+  function countDirtyView(cm) {
+    var view = cm.display.view, dirty = 0;
+    for (var i = 0; i < view.length; i++) {
+      var lineView = view[i];
+      if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }
+    }
+    return dirty
+  }
+
+  function updateSelection(cm) {
+    cm.display.input.showSelection(cm.display.input.prepareSelection());
+  }
+
+  function prepareSelection(cm, primary) {
+    if ( primary === void 0 ) primary = true;
+
+    var doc = cm.doc, result = {};
+    var curFragment = result.cursors = document.createDocumentFragment();
+    var selFragment = result.selection = document.createDocumentFragment();
+
+    var customCursor = cm.options.$customCursor;
+    if (customCursor) { primary = true; }
+    for (var i = 0; i < doc.sel.ranges.length; i++) {
+      if (!primary && i == doc.sel.primIndex) { continue }
+      var range = doc.sel.ranges[i];
+      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
+      var collapsed = range.empty();
+      if (customCursor) {
+        var head = customCursor(cm, range);
+        if (head) { drawSelectionCursor(cm, head, curFragment); }
+      } else if (collapsed || cm.options.showCursorWhenSelecting) {
+        drawSelectionCursor(cm, range.head, curFragment);
+      }
+      if (!collapsed)
+        { drawSelectionRange(cm, range, selFragment); }
+    }
+    return result
+  }
+
+  // Draws a cursor for the given range
+  function drawSelectionCursor(cm, head, output) {
+    var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);
+
+    var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
+    cursor.style.left = pos.left + "px";
+    cursor.style.top = pos.top + "px";
+    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
+
+    if (/\bcm-fat-cursor\b/.test(cm.getWrapperElement().className)) {
+      var charPos = charCoords(cm, head, "div", null, null);
+      var width = charPos.right - charPos.left;
+      cursor.style.width = (width > 0 ? width : cm.defaultCharWidth()) + "px";
+    }
+
+    if (pos.other) {
+      // Secondary cursor, shown when on a 'jump' in bi-directional text
+      var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
+      otherCursor.style.display = "";
+      otherCursor.style.left = pos.other.left + "px";
+      otherCursor.style.top = pos.other.top + "px";
+      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
+    }
+  }
+
+  function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }
+
+  // Draws the given range as a highlighted selection
+  function drawSelectionRange(cm, range, output) {
+    var display = cm.display, doc = cm.doc;
+    var fragment = document.createDocumentFragment();
+    var padding = paddingH(cm.display), leftSide = padding.left;
+    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
+    var docLTR = doc.direction == "ltr";
+
+    function add(left, top, width, bottom) {
+      if (top < 0) { top = 0; }
+      top = Math.round(top);
+      bottom = Math.round(bottom);
+      fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
+    }
+
+    function drawForLine(line, fromArg, toArg) {
+      var lineObj = getLine(doc, line);
+      var lineLen = lineObj.text.length;
+      var start, end;
+      function coords(ch, bias) {
+        return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
+      }
+
+      function wrapX(pos, dir, side) {
+        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
+        var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
+        var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
+        return coords(ch, prop)[prop]
+      }
+
+      var order = getOrder(lineObj, doc.direction);
+      iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
+        var ltr = dir == "ltr";
+        var fromPos = coords(from, ltr ? "left" : "right");
+        var toPos = coords(to - 1, ltr ? "right" : "left");
+
+        var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;
+        var first = i == 0, last = !order || i == order.length - 1;
+        if (toPos.top - fromPos.top <= 3) { // Single line
+          var openLeft = (docLTR ? openStart : openEnd) && first;
+          var openRight = (docLTR ? openEnd : openStart) && last;
+          var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
+          var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
+          add(left, fromPos.top, right - left, fromPos.bottom);
+        } else { // Multiple lines
+          var topLeft, topRight, botLeft, botRight;
+          if (ltr) {
+            topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
+            topRight = docLTR ? rightSide : wrapX(from, dir, "before");
+            botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
+            botRight = docLTR && openEnd && last ? rightSide : toPos.right;
+          } else {
+            topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
+            topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
+            botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
+            botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
+          }
+          add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
+          if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }
+          add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
+        }
+
+        if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }
+        if (cmpCoords(toPos, start) < 0) { start = toPos; }
+        if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }
+        if (cmpCoords(toPos, end) < 0) { end = toPos; }
+      });
+      return {start: start, end: end}
+    }
+
+    var sFrom = range.from(), sTo = range.to();
+    if (sFrom.line == sTo.line) {
+      drawForLine(sFrom.line, sFrom.ch, sTo.ch);
+    } else {
+      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
+      var singleVLine = visualLine(fromLine) == visualLine(toLine);
+      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
+      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
+      if (singleVLine) {
+        if (leftEnd.top < rightStart.top - 2) {
+          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
+          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
+        } else {
+          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
+        }
+      }
+      if (leftEnd.bottom < rightStart.top)
+        { add(leftSide, leftEnd.bottom, null, rightStart.top); }
+    }
+
+    output.appendChild(fragment);
+  }
+
+  // Cursor-blinking
+  function restartBlink(cm) {
+    if (!cm.state.focused) { return }
+    var display = cm.display;
+    clearInterval(display.blinker);
+    var on = true;
+    display.cursorDiv.style.visibility = "";
+    if (cm.options.cursorBlinkRate > 0)
+      { display.blinker = setInterval(function () {
+        if (!cm.hasFocus()) { onBlur(cm); }
+        display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
+      }, cm.options.cursorBlinkRate); }
+    else if (cm.options.cursorBlinkRate < 0)
+      { display.cursorDiv.style.visibility = "hidden"; }
+  }
+
+  function ensureFocus(cm) {
+    if (!cm.hasFocus()) {
+      cm.display.input.focus();
+      if (!cm.state.focused) { onFocus(cm); }
+    }
+  }
+
+  function delayBlurEvent(cm) {
+    cm.state.delayingBlurEvent = true;
+    setTimeout(function () { if (cm.state.delayingBlurEvent) {
+      cm.state.delayingBlurEvent = false;
+      if (cm.state.focused) { onBlur(cm); }
+    } }, 100);
+  }
+
+  function onFocus(cm, e) {
+    if (cm.state.delayingBlurEvent && !cm.state.draggingText) { cm.state.delayingBlurEvent = false; }
+
+    if (cm.options.readOnly == "nocursor") { return }
+    if (!cm.state.focused) {
+      signal(cm, "focus", cm, e);
+      cm.state.focused = true;
+      addClass(cm.display.wrapper, "CodeMirror-focused");
+      // This test prevents this from firing when a context
+      // menu is closed (since the input reset would kill the
+      // select-all detection hack)
+      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
+        cm.display.input.reset();
+        if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730
+      }
+      cm.display.input.receivedFocus();
+    }
+    restartBlink(cm);
+  }
+  function onBlur(cm, e) {
+    if (cm.state.delayingBlurEvent) { return }
+
+    if (cm.state.focused) {
+      signal(cm, "blur", cm, e);
+      cm.state.focused = false;
+      rmClass(cm.display.wrapper, "CodeMirror-focused");
+    }
+    clearInterval(cm.display.blinker);
+    setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);
+  }
+
+  // Read the actual heights of the rendered lines, and update their
+  // stored heights to match.
+  function updateHeightsInViewport(cm) {
+    var display = cm.display;
+    var prevBottom = display.lineDiv.offsetTop;
+    var viewTop = Math.max(0, display.scroller.getBoundingClientRect().top);
+    var oldHeight = display.lineDiv.getBoundingClientRect().top;
+    var mustScroll = 0;
+    for (var i = 0; i < display.view.length; i++) {
+      var cur = display.view[i], wrapping = cm.options.lineWrapping;
+      var height = (void 0), width = 0;
+      if (cur.hidden) { continue }
+      oldHeight += cur.line.height;
+      if (ie && ie_version < 8) {
+        var bot = cur.node.offsetTop + cur.node.offsetHeight;
+        height = bot - prevBottom;
+        prevBottom = bot;
+      } else {
+        var box = cur.node.getBoundingClientRect();
+        height = box.bottom - box.top;
+        // Check that lines don't extend past the right of the current
+        // editor width
+        if (!wrapping && cur.text.firstChild)
+          { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }
+      }
+      var diff = cur.line.height - height;
+      if (diff > .005 || diff < -.005) {
+        if (oldHeight < viewTop) { mustScroll -= diff; }
+        updateLineHeight(cur.line, height);
+        updateWidgetHeight(cur.line);
+        if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
+          { updateWidgetHeight(cur.rest[j]); } }
+      }
+      if (width > cm.display.sizerWidth) {
+        var chWidth = Math.ceil(width / charWidth(cm.display));
+        if (chWidth > cm.display.maxLineLength) {
+          cm.display.maxLineLength = chWidth;
+          cm.display.maxLine = cur.line;
+          cm.display.maxLineChanged = true;
+        }
+      }
+    }
+    if (Math.abs(mustScroll) > 2) { display.scroller.scrollTop += mustScroll; }
+  }
+
+  // Read and store the height of line widgets associated with the
+  // given line.
+  function updateWidgetHeight(line) {
+    if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {
+      var w = line.widgets[i], parent = w.node.parentNode;
+      if (parent) { w.height = parent.offsetHeight; }
+    } }
+  }
+
+  // Compute the lines that are visible in a given viewport (defaults
+  // the the current scroll position). viewport may contain top,
+  // height, and ensure (see op.scrollToPos) properties.
+  function visibleLines(display, doc, viewport) {
+    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
+    top = Math.floor(top - paddingTop(display));
+    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;
+
+    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
+    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
+    // forces those lines into the viewport (if possible).
+    if (viewport && viewport.ensure) {
+      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
+      if (ensureFrom < from) {
+        from = ensureFrom;
+        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
+      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
+        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
+        to = ensureTo;
+      }
+    }
+    return {from: from, to: Math.max(to, from + 1)}
+  }
+
+  // SCROLLING THINGS INTO VIEW
+
+  // If an editor sits on the top or bottom of the window, partially
+  // scrolled out of view, this ensures that the cursor is visible.
+  function maybeScrollWindow(cm, rect) {
+    if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }
+
+    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
+    if (rect.top + box.top < 0) { doScroll = true; }
+    else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }
+    if (doScroll != null && !phantom) {
+      var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
+      cm.display.lineSpace.appendChild(scrollNode);
+      scrollNode.scrollIntoView(doScroll);
+      cm.display.lineSpace.removeChild(scrollNode);
+    }
+  }
+
+  // Scroll a given position into view (immediately), verifying that
+  // it actually became visible (as line heights are accurately
+  // measured, the position of something may 'drift' during drawing).
+  function scrollPosIntoView(cm, pos, end, margin) {
+    if (margin == null) { margin = 0; }
+    var rect;
+    if (!cm.options.lineWrapping && pos == end) {
+      // Set pos and end to the cursor positions around the character pos sticks to
+      // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
+      // If pos == Pos(_, 0, "before"), pos and end are unchanged
+      end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
+      pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
+    }
+    for (var limit = 0; limit < 5; limit++) {
+      var changed = false;
+      var coords = cursorCoords(cm, pos);
+      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
+      rect = {left: Math.min(coords.left, endCoords.left),
+              top: Math.min(coords.top, endCoords.top) - margin,
+              right: Math.max(coords.left, endCoords.left),
+              bottom: Math.max(coords.bottom, endCoords.bottom) + margin};
+      var scrollPos = calculateScrollPos(cm, rect);
+      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
+      if (scrollPos.scrollTop != null) {
+        updateScrollTop(cm, scrollPos.scrollTop);
+        if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }
+      }
+      if (scrollPos.scrollLeft != null) {
+        setScrollLeft(cm, scrollPos.scrollLeft);
+        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }
+      }
+      if (!changed) { break }
+    }
+    return rect
+  }
+
+  // Scroll a given set of coordinates into view (immediately).
+  function scrollIntoView(cm, rect) {
+    var scrollPos = calculateScrollPos(cm, rect);
+    if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }
+    if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }
+  }
+
+  // Calculate a new scroll position needed to scroll the given
+  // rectangle into view. Returns an object with scrollTop and
+  // scrollLeft properties. When these are undefined, the
+  // vertical/horizontal position does not need to be adjusted.
+  function calculateScrollPos(cm, rect) {
+    var display = cm.display, snapMargin = textHeight(cm.display);
+    if (rect.top < 0) { rect.top = 0; }
+    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
+    var screen = displayHeight(cm), result = {};
+    if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }
+    var docBottom = cm.doc.height + paddingVert(display);
+    var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
+    if (rect.top < screentop) {
+      result.scrollTop = atTop ? 0 : rect.top;
+    } else if (rect.bottom > screentop + screen) {
+      var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
+      if (newTop != screentop) { result.scrollTop = newTop; }
+    }
+
+    var gutterSpace = cm.options.fixedGutter ? 0 : display.gutters.offsetWidth;
+    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft - gutterSpace;
+    var screenw = displayWidth(cm) - display.gutters.offsetWidth;
+    var tooWide = rect.right - rect.left > screenw;
+    if (tooWide) { rect.right = rect.left + screenw; }
+    if (rect.left < 10)
+      { result.scrollLeft = 0; }
+    else if (rect.left < screenleft)
+      { result.scrollLeft = Math.max(0, rect.left + gutterSpace - (tooWide ? 0 : 10)); }
+    else if (rect.right > screenw + screenleft - 3)
+      { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }
+    return result
+  }
+
+  // Store a relative adjustment to the scroll position in the current
+  // operation (to be applied when the operation finishes).
+  function addToScrollTop(cm, top) {
+    if (top == null) { return }
+    resolveScrollToPos(cm);
+    cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
+  }
+
+  // Make sure that at the end of the operation the current cursor is
+  // shown.
+  function ensureCursorVisible(cm) {
+    resolveScrollToPos(cm);
+    var cur = cm.getCursor();
+    cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};
+  }
+
+  function scrollToCoords(cm, x, y) {
+    if (x != null || y != null) { resolveScrollToPos(cm); }
+    if (x != null) { cm.curOp.scrollLeft = x; }
+    if (y != null) { cm.curOp.scrollTop = y; }
+  }
+
+  function scrollToRange(cm, range) {
+    resolveScrollToPos(cm);
+    cm.curOp.scrollToPos = range;
+  }
+
+  // When an operation has its scrollToPos property set, and another
+  // scroll action is applied before the end of the operation, this
+  // 'simulates' scrolling that position into view in a cheap way, so
+  // that the effect of intermediate scroll commands is not ignored.
+  function resolveScrollToPos(cm) {
+    var range = cm.curOp.scrollToPos;
+    if (range) {
+      cm.curOp.scrollToPos = null;
+      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
+      scrollToCoordsRange(cm, from, to, range.margin);
+    }
+  }
+
+  function scrollToCoordsRange(cm, from, to, margin) {
+    var sPos = calculateScrollPos(cm, {
+      left: Math.min(from.left, to.left),
+      top: Math.min(from.top, to.top) - margin,
+      right: Math.max(from.right, to.right),
+      bottom: Math.max(from.bottom, to.bottom) + margin
+    });
+    scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
+  }
+
+  // Sync the scrollable area and scrollbars, ensure the viewport
+  // covers the visible area.
+  function updateScrollTop(cm, val) {
+    if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
+    if (!gecko) { updateDisplaySimple(cm, {top: val}); }
+    setScrollTop(cm, val, true);
+    if (gecko) { updateDisplaySimple(cm); }
+    startWorker(cm, 100);
+  }
+
+  function setScrollTop(cm, val, forceScroll) {
+    val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));
+    if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
+    cm.doc.scrollTop = val;
+    cm.display.scrollbars.setScrollTop(val);
+    if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }
+  }
+
+  // Sync scroller and scrollbar, ensure the gutter elements are
+  // aligned.
+  function setScrollLeft(cm, val, isScroller, forceScroll) {
+    val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));
+    if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
+    cm.doc.scrollLeft = val;
+    alignHorizontally(cm);
+    if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }
+    cm.display.scrollbars.setScrollLeft(val);
+  }
+
+  // SCROLLBARS
+
+  // Prepare DOM reads needed to update the scrollbars. Done in one
+  // shot to minimize update/measure roundtrips.
+  function measureForScrollbars(cm) {
+    var d = cm.display, gutterW = d.gutters.offsetWidth;
+    var docH = Math.round(cm.doc.height + paddingVert(cm.display));
+    return {
+      clientHeight: d.scroller.clientHeight,
+      viewHeight: d.wrapper.clientHeight,
+      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
+      viewWidth: d.wrapper.clientWidth,
+      barLeft: cm.options.fixedGutter ? gutterW : 0,
+      docHeight: docH,
+      scrollHeight: docH + scrollGap(cm) + d.barHeight,
+      nativeBarWidth: d.nativeBarWidth,
+      gutterWidth: gutterW
+    }
+  }
+
+  var NativeScrollbars = function(place, scroll, cm) {
+    this.cm = cm;
+    var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
+    var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
+    vert.tabIndex = horiz.tabIndex = -1;
+    place(vert); place(horiz);
+
+    on(vert, "scroll", function () {
+      if (vert.clientHeight) { scroll(vert.scrollTop, "vertical"); }
+    });
+    on(horiz, "scroll", function () {
+      if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal"); }
+    });
+
+    this.checkedZeroWidth = false;
+    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
+    if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px"; }
+  };
+
+  NativeScrollbars.prototype.update = function (measure) {
+    var needsH = measure.scrollWidth > measure.clientWidth + 1;
+    var needsV = measure.scrollHeight > measure.clientHeight + 1;
+    var sWidth = measure.nativeBarWidth;
+
+    if (needsV) {
+      this.vert.style.display = "block";
+      this.vert.style.bottom = needsH ? sWidth + "px" : "0";
+      var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
+      // A bug in IE8 can cause this value to be negative, so guard it.
+      this.vert.firstChild.style.height =
+        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
+    } else {
+      this.vert.scrollTop = 0;
+      this.vert.style.display = "";
+      this.vert.firstChild.style.height = "0";
+    }
+
+    if (needsH) {
+      this.horiz.style.display = "block";
+      this.horiz.style.right = needsV ? sWidth + "px" : "0";
+      this.horiz.style.left = measure.barLeft + "px";
+      var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
+      this.horiz.firstChild.style.width =
+        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
+    } else {
+      this.horiz.style.display = "";
+      this.horiz.firstChild.style.width = "0";
+    }
+
+    if (!this.checkedZeroWidth && measure.clientHeight > 0) {
+      if (sWidth == 0) { this.zeroWidthHack(); }
+      this.checkedZeroWidth = true;
+    }
+
+    return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
+  };
+
+  NativeScrollbars.prototype.setScrollLeft = function (pos) {
+    if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }
+    if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz"); }
+  };
+
+  NativeScrollbars.prototype.setScrollTop = function (pos) {
+    if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }
+    if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert"); }
+  };
+
+  NativeScrollbars.prototype.zeroWidthHack = function () {
+    var w = mac && !mac_geMountainLion ? "12px" : "18px";
+    this.horiz.style.height = this.vert.style.width = w;
+    this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
+    this.disableHoriz = new Delayed;
+    this.disableVert = new Delayed;
+  };
+
+  NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
+    bar.style.pointerEvents = "auto";
+    function maybeDisable() {
+      // To find out whether the scrollbar is still visible, we
+      // check whether the element under the pixel in the bottom
+      // right corner of the scrollbar box is the scrollbar box
+      // itself (when the bar is still visible) or its filler child
+      // (when the bar is hidden). If it is still visible, we keep
+      // it enabled, if it's hidden, we disable pointer events.
+      var box = bar.getBoundingClientRect();
+      var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
+          : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
+      if (elt != bar) { bar.style.pointerEvents = "none"; }
+      else { delay.set(1000, maybeDisable); }
+    }
+    delay.set(1000, maybeDisable);
+  };
+
+  NativeScrollbars.prototype.clear = function () {
+    var parent = this.horiz.parentNode;
+    parent.removeChild(this.horiz);
+    parent.removeChild(this.vert);
+  };
+
+  var NullScrollbars = function () {};
+
+  NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
+  NullScrollbars.prototype.setScrollLeft = function () {};
+  NullScrollbars.prototype.setScrollTop = function () {};
+  NullScrollbars.prototype.clear = function () {};
+
+  function updateScrollbars(cm, measure) {
+    if (!measure) { measure = measureForScrollbars(cm); }
+    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
+    updateScrollbarsInner(cm, measure);
+    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
+      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
+        { updateHeightsInViewport(cm); }
+      updateScrollbarsInner(cm, measureForScrollbars(cm));
+      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
+    }
+  }
+
+  // Re-synchronize the fake scrollbars with the actual size of the
+  // content.
+  function updateScrollbarsInner(cm, measure) {
+    var d = cm.display;
+    var sizes = d.scrollbars.update(measure);
+
+    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
+    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
+    d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";
+
+    if (sizes.right && sizes.bottom) {
+      d.scrollbarFiller.style.display = "block";
+      d.scrollbarFiller.style.height = sizes.bottom + "px";
+      d.scrollbarFiller.style.width = sizes.right + "px";
+    } else { d.scrollbarFiller.style.display = ""; }
+    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
+      d.gutterFiller.style.display = "block";
+      d.gutterFiller.style.height = sizes.bottom + "px";
+      d.gutterFiller.style.width = measure.gutterWidth + "px";
+    } else { d.gutterFiller.style.display = ""; }
+  }
+
+  var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};
+
+  function initScrollbars(cm) {
+    if (cm.display.scrollbars) {
+      cm.display.scrollbars.clear();
+      if (cm.display.scrollbars.addClass)
+        { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
+    }
+
+    cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
+      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
+      // Prevent clicks in the scrollbars from killing focus
+      on(node, "mousedown", function () {
+        if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }
+      });
+      node.setAttribute("cm-not-content", "true");
+    }, function (pos, axis) {
+      if (axis == "horizontal") { setScrollLeft(cm, pos); }
+      else { updateScrollTop(cm, pos); }
+    }, cm);
+    if (cm.display.scrollbars.addClass)
+      { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
+  }
+
+  // Operations are used to wrap a series of changes to the editor
+  // state in such a way that each change won't have to update the
+  // cursor and display (which would be awkward, slow, and
+  // error-prone). Instead, display updates are batched and then all
+  // combined and executed at once.
+
+  var nextOpId = 0;
+  // Start a new operation.
+  function startOperation(cm) {
+    cm.curOp = {
+      cm: cm,
+      viewChanged: false,      // Flag that indicates that lines might need to be redrawn
+      startHeight: cm.doc.height, // Used to detect need to update scrollbar
+      forceUpdate: false,      // Used to force a redraw
+      updateInput: 0,       // Whether to reset the input textarea
+      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
+      changeObjs: null,        // Accumulated changes, for firing change events
+      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
+      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
+      selectionChanged: false, // Whether the selection needs to be redrawn
+      updateMaxLine: false,    // Set when the widest line needs to be determined anew
+      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
+      scrollToPos: null,       // Used to scroll to a specific position
+      focus: false,
+      id: ++nextOpId,          // Unique ID
+      markArrays: null         // Used by addMarkedSpan
+    };
+    pushOperation(cm.curOp);
+  }
+
+  // Finish an operation, updating the display and signalling delayed events
+  function endOperation(cm) {
+    var op = cm.curOp;
+    if (op) { finishOperation(op, function (group) {
+      for (var i = 0; i < group.ops.length; i++)
+        { group.ops[i].cm.curOp = null; }
+      endOperations(group);
+    }); }
+  }
+
+  // The DOM updates done when an operation finishes are batched so
+  // that the minimum number of relayouts are required.
+  function endOperations(group) {
+    var ops = group.ops;
+    for (var i = 0; i < ops.length; i++) // Read DOM
+      { endOperation_R1(ops[i]); }
+    for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
+      { endOperation_W1(ops[i$1]); }
+    for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
+      { endOperation_R2(ops[i$2]); }
+    for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
+      { endOperation_W2(ops[i$3]); }
+    for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
+      { endOperation_finish(ops[i$4]); }
+  }
+
+  function endOperation_R1(op) {
+    var cm = op.cm, display = cm.display;
+    maybeClipScrollbars(cm);
+    if (op.updateMaxLine) { findMaxLine(cm); }
+
+    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
+      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
+                         op.scrollToPos.to.line >= display.viewTo) ||
+      display.maxLineChanged && cm.options.lineWrapping;
+    op.update = op.mustUpdate &&
+      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
+  }
+
+  function endOperation_W1(op) {
+    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
+  }
+
+  function endOperation_R2(op) {
+    var cm = op.cm, display = cm.display;
+    if (op.updatedDisplay) { updateHeightsInViewport(cm); }
+
+    op.barMeasure = measureForScrollbars(cm);
+
+    // If the max line changed since it was last measured, measure it,
+    // and ensure the document's width matches it.
+    // updateDisplay_W2 will use these properties to do the actual resizing
+    if (display.maxLineChanged && !cm.options.lineWrapping) {
+      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
+      cm.display.sizerWidth = op.adjustWidthTo;
+      op.barMeasure.scrollWidth =
+        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
+      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
+    }
+
+    if (op.updatedDisplay || op.selectionChanged)
+      { op.preparedSelection = display.input.prepareSelection(); }
+  }
+
+  function endOperation_W2(op) {
+    var cm = op.cm;
+
+    if (op.adjustWidthTo != null) {
+      cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
+      if (op.maxScrollLeft < cm.doc.scrollLeft)
+        { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }
+      cm.display.maxLineChanged = false;
+    }
+
+    var takeFocus = op.focus && op.focus == activeElt();
+    if (op.preparedSelection)
+      { cm.display.input.showSelection(op.preparedSelection, takeFocus); }
+    if (op.updatedDisplay || op.startHeight != cm.doc.height)
+      { updateScrollbars(cm, op.barMeasure); }
+    if (op.updatedDisplay)
+      { setDocumentHeight(cm, op.barMeasure); }
+
+    if (op.selectionChanged) { restartBlink(cm); }
+
+    if (cm.state.focused && op.updateInput)
+      { cm.display.input.reset(op.typing); }
+    if (takeFocus) { ensureFocus(op.cm); }
+  }
+
+  function endOperation_finish(op) {
+    var cm = op.cm, display = cm.display, doc = cm.doc;
+
+    if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }
+
+    // Abort mouse wheel delta measurement, when scrolling explicitly
+    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
+      { display.wheelStartX = display.wheelStartY = null; }
+
+    // Propagate the scroll position to the actual DOM scroller
+    if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }
+
+    if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }
+    // If we need to scroll a specific position into view, do so.
+    if (op.scrollToPos) {
+      var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
+                                   clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
+      maybeScrollWindow(cm, rect);
+    }
+
+    // Fire events for markers that are hidden/unidden by editing or
+    // undoing
+    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
+    if (hidden) { for (var i = 0; i < hidden.length; ++i)
+      { if (!hidden[i].lines.length) { signal(hidden[i], "hide"); } } }
+    if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
+      { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide"); } } }
+
+    if (display.wrapper.offsetHeight)
+      { doc.scrollTop = cm.display.scroller.scrollTop; }
+
+    // Fire change events, and delayed event handlers
+    if (op.changeObjs)
+      { signal(cm, "changes", cm, op.changeObjs); }
+    if (op.update)
+      { op.update.finish(); }
+  }
+
+  // Run the given function in an operation
+  function runInOp(cm, f) {
+    if (cm.curOp) { return f() }
+    startOperation(cm);
+    try { return f() }
+    finally { endOperation(cm); }
+  }
+  // Wraps a function in an operation. Returns the wrapped function.
+  function operation(cm, f) {
+    return function() {
+      if (cm.curOp) { return f.apply(cm, arguments) }
+      startOperation(cm);
+      try { return f.apply(cm, arguments) }
+      finally { endOperation(cm); }
+    }
+  }
+  // Used to add methods to editor and doc instances, wrapping them in
+  // operations.
+  function methodOp(f) {
+    return function() {
+      if (this.curOp) { return f.apply(this, arguments) }
+      startOperation(this);
+      try { return f.apply(this, arguments) }
+      finally { endOperation(this); }
+    }
+  }
+  function docMethodOp(f) {
+    return function() {
+      var cm = this.cm;
+      if (!cm || cm.curOp) { return f.apply(this, arguments) }
+      startOperation(cm);
+      try { return f.apply(this, arguments) }
+      finally { endOperation(cm); }
+    }
+  }
+
+  // HIGHLIGHT WORKER
+
+  function startWorker(cm, time) {
+    if (cm.doc.highlightFrontier < cm.display.viewTo)
+      { cm.state.highlight.set(time, bind(highlightWorker, cm)); }
+  }
+
+  function highlightWorker(cm) {
+    var doc = cm.doc;
+    if (doc.highlightFrontier >= cm.display.viewTo) { return }
+    var end = +new Date + cm.options.workTime;
+    var context = getContextBefore(cm, doc.highlightFrontier);
+    var changedLines = [];
+
+    doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
+      if (context.line >= cm.display.viewFrom) { // Visible
+        var oldStyles = line.styles;
+        var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
+        var highlighted = highlightLine(cm, line, context, true);
+        if (resetState) { context.state = resetState; }
+        line.styles = highlighted.styles;
+        var oldCls = line.styleClasses, newCls = highlighted.classes;
+        if (newCls) { line.styleClasses = newCls; }
+        else if (oldCls) { line.styleClasses = null; }
+        var ischange = !oldStyles || oldStyles.length != line.styles.length ||
+          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
+        for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }
+        if (ischange) { changedLines.push(context.line); }
+        line.stateAfter = context.save();
+        context.nextLine();
+      } else {
+        if (line.text.length <= cm.options.maxHighlightLength)
+          { processLine(cm, line.text, context); }
+        line.stateAfter = context.line % 5 == 0 ? context.save() : null;
+        context.nextLine();
+      }
+      if (+new Date > end) {
+        startWorker(cm, cm.options.workDelay);
+        return true
+      }
+    });
+    doc.highlightFrontier = context.line;
+    doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
+    if (changedLines.length) { runInOp(cm, function () {
+      for (var i = 0; i < changedLines.length; i++)
+        { regLineChange(cm, changedLines[i], "text"); }
+    }); }
+  }
+
+  // DISPLAY DRAWING
+
+  var DisplayUpdate = function(cm, viewport, force) {
+    var display = cm.display;
+
+    this.viewport = viewport;
+    // Store some values that we'll need later (but don't want to force a relayout for)
+    this.visible = visibleLines(display, cm.doc, viewport);
+    this.editorIsHidden = !display.wrapper.offsetWidth;
+    this.wrapperHeight = display.wrapper.clientHeight;
+    this.wrapperWidth = display.wrapper.clientWidth;
+    this.oldDisplayWidth = displayWidth(cm);
+    this.force = force;
+    this.dims = getDimensions(cm);
+    this.events = [];
+  };
+
+  DisplayUpdate.prototype.signal = function (emitter, type) {
+    if (hasHandler(emitter, type))
+      { this.events.push(arguments); }
+  };
+  DisplayUpdate.prototype.finish = function () {
+    for (var i = 0; i < this.events.length; i++)
+      { signal.apply(null, this.events[i]); }
+  };
+
+  function maybeClipScrollbars(cm) {
+    var display = cm.display;
+    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
+      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
+      display.heightForcer.style.height = scrollGap(cm) + "px";
+      display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
+      display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
+      display.scrollbarsClipped = true;
+    }
+  }
+
+  function selectionSnapshot(cm) {
+    if (cm.hasFocus()) { return null }
+    var active = activeElt();
+    if (!active || !contains(cm.display.lineDiv, active)) { return null }
+    var result = {activeElt: active};
+    if (window.getSelection) {
+      var sel = window.getSelection();
+      if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
+        result.anchorNode = sel.anchorNode;
+        result.anchorOffset = sel.anchorOffset;
+        result.focusNode = sel.focusNode;
+        result.focusOffset = sel.focusOffset;
+      }
+    }
+    return result
+  }
+
+  function restoreSelection(snapshot) {
+    if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }
+    snapshot.activeElt.focus();
+    if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&
+        snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
+      var sel = window.getSelection(), range = document.createRange();
+      range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
+      range.collapse(false);
+      sel.removeAllRanges();
+      sel.addRange(range);
+      sel.extend(snapshot.focusNode, snapshot.focusOffset);
+    }
+  }
+
+  // Does the actual updating of the line display. Bails out
+  // (returning false) when there is nothing to be done and forced is
+  // false.
+  function updateDisplayIfNeeded(cm, update) {
+    var display = cm.display, doc = cm.doc;
+
+    if (update.editorIsHidden) {
+      resetView(cm);
+      return false
+    }
+
+    // Bail out if the visible area is already rendered and nothing changed.
+    if (!update.force &&
+        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
+        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
+        display.renderedView == display.view && countDirtyView(cm) == 0)
+      { return false }
+
+    if (maybeUpdateLineNumberWidth(cm)) {
+      resetView(cm);
+      update.dims = getDimensions(cm);
+    }
+
+    // Compute a suitable new viewport (from & to)
+    var end = doc.first + doc.size;
+    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
+    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
+    if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }
+    if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }
+    if (sawCollapsedSpans) {
+      from = visualLineNo(cm.doc, from);
+      to = visualLineEndNo(cm.doc, to);
+    }
+
+    var different = from != display.viewFrom || to != display.viewTo ||
+      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
+    adjustView(cm, from, to);
+
+    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
+    // Position the mover div to align with the current scroll position
+    cm.display.mover.style.top = display.viewOffset + "px";
+
+    var toUpdate = countDirtyView(cm);
+    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
+        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
+      { return false }
+
+    // For big changes, we hide the enclosing element during the
+    // update, since that speeds up the operations on most browsers.
+    var selSnapshot = selectionSnapshot(cm);
+    if (toUpdate > 4) { display.lineDiv.style.display = "none"; }
+    patchDisplay(cm, display.updateLineNumbers, update.dims);
+    if (toUpdate > 4) { display.lineDiv.style.display = ""; }
+    display.renderedView = display.view;
+    // There might have been a widget with a focused element that got
+    // hidden or updated, if so re-focus it.
+    restoreSelection(selSnapshot);
+
+    // Prevent selection and cursors from interfering with the scroll
+    // width and height.
+    removeChildren(display.cursorDiv);
+    removeChildren(display.selectionDiv);
+    display.gutters.style.height = display.sizer.style.minHeight = 0;
+
+    if (different) {
+      display.lastWrapHeight = update.wrapperHeight;
+      display.lastWrapWidth = update.wrapperWidth;
+      startWorker(cm, 400);
+    }
+
+    display.updateLineNumbers = null;
+
+    return true
+  }
+
+  function postUpdateDisplay(cm, update) {
+    var viewport = update.viewport;
+
+    for (var first = true;; first = false) {
+      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
+        // Clip forced viewport to actual scrollable area.
+        if (viewport && viewport.top != null)
+          { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }
+        // Updated line heights might result in the drawn area not
+        // actually covering the viewport. Keep looping until it does.
+        update.visible = visibleLines(cm.display, cm.doc, viewport);
+        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
+          { break }
+      } else if (first) {
+        update.visible = visibleLines(cm.display, cm.doc, viewport);
+      }
+      if (!updateDisplayIfNeeded(cm, update)) { break }
+      updateHeightsInViewport(cm);
+      var barMeasure = measureForScrollbars(cm);
+      updateSelection(cm);
+      updateScrollbars(cm, barMeasure);
+      setDocumentHeight(cm, barMeasure);
+      update.force = false;
+    }
+
+    update.signal(cm, "update", cm);
+    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
+      update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
+      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
+    }
+  }
+
+  function updateDisplaySimple(cm, viewport) {
+    var update = new DisplayUpdate(cm, viewport);
+    if (updateDisplayIfNeeded(cm, update)) {
+      updateHeightsInViewport(cm);
+      postUpdateDisplay(cm, update);
+      var barMeasure = measureForScrollbars(cm);
+      updateSelection(cm);
+      updateScrollbars(cm, barMeasure);
+      setDocumentHeight(cm, barMeasure);
+      update.finish();
+    }
+  }
+
+  // Sync the actual display DOM structure with display.view, removing
+  // nodes for lines that are no longer in view, and creating the ones
+  // that are not there yet, and updating the ones that are out of
+  // date.
+  function patchDisplay(cm, updateNumbersFrom, dims) {
+    var display = cm.display, lineNumbers = cm.options.lineNumbers;
+    var container = display.lineDiv, cur = container.firstChild;
+
+    function rm(node) {
+      var next = node.nextSibling;
+      // Works around a throw-scroll bug in OS X Webkit
+      if (webkit && mac && cm.display.currentWheelTarget == node)
+        { node.style.display = "none"; }
+      else
+        { node.parentNode.removeChild(node); }
+      return next
+    }
+
+    var view = display.view, lineN = display.viewFrom;
+    // Loop over the elements in the view, syncing cur (the DOM nodes
+    // in display.lineDiv) with the view as we go.
+    for (var i = 0; i < view.length; i++) {
+      var lineView = view[i];
+      if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
+        var node = buildLineElement(cm, lineView, lineN, dims);
+        container.insertBefore(node, cur);
+      } else { // Already drawn
+        while (cur != lineView.node) { cur = rm(cur); }
+        var updateNumber = lineNumbers && updateNumbersFrom != null &&
+          updateNumbersFrom <= lineN && lineView.lineNumber;
+        if (lineView.changes) {
+          if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false; }
+          updateLineForChanges(cm, lineView, lineN, dims);
+        }
+        if (updateNumber) {
+          removeChildren(lineView.lineNumber);
+          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
+        }
+        cur = lineView.node.nextSibling;
+      }
+      lineN += lineView.size;
+    }
+    while (cur) { cur = rm(cur); }
+  }
+
+  function updateGutterSpace(display) {
+    var width = display.gutters.offsetWidth;
+    display.sizer.style.marginLeft = width + "px";
+    // Send an event to consumers responding to changes in gutter width.
+    signalLater(display, "gutterChanged", display);
+  }
+
+  function setDocumentHeight(cm, measure) {
+    cm.display.sizer.style.minHeight = measure.docHeight + "px";
+    cm.display.heightForcer.style.top = measure.docHeight + "px";
+    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
+  }
+
+  // Re-align line numbers and gutter marks to compensate for
+  // horizontal scrolling.
+  function alignHorizontally(cm) {
+    var display = cm.display, view = display.view;
+    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
+    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
+    var gutterW = display.gutters.offsetWidth, left = comp + "px";
+    for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
+      if (cm.options.fixedGutter) {
+        if (view[i].gutter)
+          { view[i].gutter.style.left = left; }
+        if (view[i].gutterBackground)
+          { view[i].gutterBackground.style.left = left; }
+      }
+      var align = view[i].alignable;
+      if (align) { for (var j = 0; j < align.length; j++)
+        { align[j].style.left = left; } }
+    } }
+    if (cm.options.fixedGutter)
+      { display.gutters.style.left = (comp + gutterW) + "px"; }
+  }
+
+  // Used to ensure that the line number gutter is still the right
+  // size for the current document size. Returns true when an update
+  // is needed.
+  function maybeUpdateLineNumberWidth(cm) {
+    if (!cm.options.lineNumbers) { return false }
+    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
+    if (last.length != display.lineNumChars) {
+      var test = display.measure.appendChild(elt("div", [elt("div", last)],
+                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
+      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
+      display.lineGutter.style.width = "";
+      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
+      display.lineNumWidth = display.lineNumInnerWidth + padding;
+      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
+      display.lineGutter.style.width = display.lineNumWidth + "px";
+      updateGutterSpace(cm.display);
+      return true
+    }
+    return false
+  }
+
+  function getGutters(gutters, lineNumbers) {
+    var result = [], sawLineNumbers = false;
+    for (var i = 0; i < gutters.length; i++) {
+      var name = gutters[i], style = null;
+      if (typeof name != "string") { style = name.style; name = name.className; }
+      if (name == "CodeMirror-linenumbers") {
+        if (!lineNumbers) { continue }
+        else { sawLineNumbers = true; }
+      }
+      result.push({className: name, style: style});
+    }
+    if (lineNumbers && !sawLineNumbers) { result.push({className: "CodeMirror-linenumbers", style: null}); }
+    return result
+  }
+
+  // Rebuild the gutter elements, ensure the margin to the left of the
+  // code matches their width.
+  function renderGutters(display) {
+    var gutters = display.gutters, specs = display.gutterSpecs;
+    removeChildren(gutters);
+    display.lineGutter = null;
+    for (var i = 0; i < specs.length; ++i) {
+      var ref = specs[i];
+      var className = ref.className;
+      var style = ref.style;
+      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + className));
+      if (style) { gElt.style.cssText = style; }
+      if (className == "CodeMirror-linenumbers") {
+        display.lineGutter = gElt;
+        gElt.style.width = (display.lineNumWidth || 1) + "px";
+      }
+    }
+    gutters.style.display = specs.length ? "" : "none";
+    updateGutterSpace(display);
+  }
+
+  function updateGutters(cm) {
+    renderGutters(cm.display);
+    regChange(cm);
+    alignHorizontally(cm);
+  }
+
+  // The display handles the DOM integration, both for input reading
+  // and content drawing. It holds references to DOM nodes and
+  // display-related state.
+
+  function Display(place, doc, input, options) {
+    var d = this;
+    this.input = input;
+
+    // Covers bottom-right square when both scrollbars are present.
+    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
+    d.scrollbarFiller.setAttribute("cm-not-content", "true");
+    // Covers bottom of gutter when coverGutterNextToScrollbar is on
+    // and h scrollbar is present.
+    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
+    d.gutterFiller.setAttribute("cm-not-content", "true");
+    // Will contain the actual code, positioned to cover the viewport.
+    d.lineDiv = eltP("div", null, "CodeMirror-code");
+    // Elements are added to these to represent selection and cursors.
+    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
+    d.cursorDiv = elt("div", null, "CodeMirror-cursors");
+    // A visibility: hidden element used to find the size of things.
+    d.measure = elt("div", null, "CodeMirror-measure");
+    // When lines outside of the viewport are measured, they are drawn in this.
+    d.lineMeasure = elt("div", null, "CodeMirror-measure");
+    // Wraps everything that needs to exist inside the vertically-padded coordinate system
+    d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
+                      null, "position: relative; outline: none");
+    var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
+    // Moved around its parent to cover visible view.
+    d.mover = elt("div", [lines], null, "position: relative");
+    // Set to the height of the document, allowing scrolling.
+    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
+    d.sizerWidth = null;
+    // Behavior of elts with overflow: auto and padding is
+    // inconsistent across browsers. This is used to ensure the
+    // scrollable area is big enough.
+    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
+    // Will contain the gutters, if any.
+    d.gutters = elt("div", null, "CodeMirror-gutters");
+    d.lineGutter = null;
+    // Actual scrollable element.
+    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
+    d.scroller.setAttribute("tabIndex", "-1");
+    // The element in which the editor lives.
+    d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
+
+    // This attribute is respected by automatic translation systems such as Google Translate,
+    // and may also be respected by tools used by human translators.
+    d.wrapper.setAttribute('translate', 'no');
+
+    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
+    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
+    if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }
+
+    if (place) {
+      if (place.appendChild) { place.appendChild(d.wrapper); }
+      else { place(d.wrapper); }
+    }
+
+    // Current rendered range (may be bigger than the view window).
+    d.viewFrom = d.viewTo = doc.first;
+    d.reportedViewFrom = d.reportedViewTo = doc.first;
+    // Information about the rendered lines.
+    d.view = [];
+    d.renderedView = null;
+    // Holds info about a single rendered line when it was rendered
+    // for measurement, while not in view.
+    d.externalMeasured = null;
+    // Empty space (in pixels) above the view
+    d.viewOffset = 0;
+    d.lastWrapHeight = d.lastWrapWidth = 0;
+    d.updateLineNumbers = null;
+
+    d.nativeBarWidth = d.barHeight = d.barWidth = 0;
+    d.scrollbarsClipped = false;
+
+    // Used to only resize the line number gutter when necessary (when
+    // the amount of lines crosses a boundary that makes its width change)
+    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
+    // Set to true when a non-horizontal-scrolling line widget is
+    // added. As an optimization, line widget aligning is skipped when
+    // this is false.
+    d.alignWidgets = false;
+
+    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
+
+    // Tracks the maximum line length so that the horizontal scrollbar
+    // can be kept static when scrolling.
+    d.maxLine = null;
+    d.maxLineLength = 0;
+    d.maxLineChanged = false;
+
+    // Used for measuring wheel scrolling granularity
+    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
+
+    // True when shift is held down.
+    d.shift = false;
+
+    // Used to track whether anything happened since the context menu
+    // was opened.
+    d.selForContextMenu = null;
+
+    d.activeTouch = null;
+
+    d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);
+    renderGutters(d);
+
+    input.init(d);
+  }
+
+  // Since the delta values reported on mouse wheel events are
+  // unstandardized between browsers and even browser versions, and
+  // generally horribly unpredictable, this code starts by measuring
+  // the scroll effect that the first few mouse wheel events have,
+  // and, from that, detects the way it can convert deltas to pixel
+  // offsets afterwards.
+  //
+  // The reason we want to know the amount a wheel event will scroll
+  // is that it gives us a chance to update the display before the
+  // actual scrolling happens, reducing flickering.
+
+  var wheelSamples = 0, wheelPixelsPerUnit = null;
+  // Fill in a browser-detected starting value on browsers where we
+  // know one. These don't have to be accurate -- the result of them
+  // being wrong would just be a slight flicker on the first wheel
+  // scroll (if it is large enough).
+  if (ie) { wheelPixelsPerUnit = -.53; }
+  else if (gecko) { wheelPixelsPerUnit = 15; }
+  else if (chrome) { wheelPixelsPerUnit = -.7; }
+  else if (safari) { wheelPixelsPerUnit = -1/3; }
+
+  function wheelEventDelta(e) {
+    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
+    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }
+    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }
+    else if (dy == null) { dy = e.wheelDelta; }
+    return {x: dx, y: dy}
+  }
+  function wheelEventPixels(e) {
+    var delta = wheelEventDelta(e);
+    delta.x *= wheelPixelsPerUnit;
+    delta.y *= wheelPixelsPerUnit;
+    return delta
+  }
+
+  function onScrollWheel(cm, e) {
+    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
+    var pixelsPerUnit = wheelPixelsPerUnit;
+    if (e.deltaMode === 0) {
+      dx = e.deltaX;
+      dy = e.deltaY;
+      pixelsPerUnit = 1;
+    }
+
+    var display = cm.display, scroll = display.scroller;
+    // Quit if there's nothing to scroll here
+    var canScrollX = scroll.scrollWidth > scroll.clientWidth;
+    var canScrollY = scroll.scrollHeight > scroll.clientHeight;
+    if (!(dx && canScrollX || dy && canScrollY)) { return }
+
+    // Webkit browsers on OS X abort momentum scrolls when the target
+    // of the scroll event is removed from the scrollable element.
+    // This hack (see related code in patchDisplay) makes sure the
+    // element is kept around.
+    if (dy && mac && webkit) {
+      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
+        for (var i = 0; i < view.length; i++) {
+          if (view[i].node == cur) {
+            cm.display.currentWheelTarget = cur;
+            break outer
+          }
+        }
+      }
+    }
+
+    // On some browsers, horizontal scrolling will cause redraws to
+    // happen before the gutter has been realigned, causing it to
+    // wriggle around in a most unseemly way. When we have an
+    // estimated pixels/delta value, we just handle horizontal
+    // scrolling entirely here. It'll be slightly off from native, but
+    // better than glitching out.
+    if (dx && !gecko && !presto && pixelsPerUnit != null) {
+      if (dy && canScrollY)
+        { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * pixelsPerUnit)); }
+      setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * pixelsPerUnit));
+      // Only prevent default scrolling if vertical scrolling is
+      // actually possible. Otherwise, it causes vertical scroll
+      // jitter on OSX trackpads when deltaX is small and deltaY
+      // is large (issue #3579)
+      if (!dy || (dy && canScrollY))
+        { e_preventDefault(e); }
+      display.wheelStartX = null; // Abort measurement, if in progress
+      return
+    }
+
+    // 'Project' the visible viewport to cover the area that is being
+    // scrolled into view (if we know enough to estimate it).
+    if (dy && pixelsPerUnit != null) {
+      var pixels = dy * pixelsPerUnit;
+      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
+      if (pixels < 0) { top = Math.max(0, top + pixels - 50); }
+      else { bot = Math.min(cm.doc.height, bot + pixels + 50); }
+      updateDisplaySimple(cm, {top: top, bottom: bot});
+    }
+
+    if (wheelSamples < 20 && e.deltaMode !== 0) {
+      if (display.wheelStartX == null) {
+        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
+        display.wheelDX = dx; display.wheelDY = dy;
+        setTimeout(function () {
+          if (display.wheelStartX == null) { return }
+          var movedX = scroll.scrollLeft - display.wheelStartX;
+          var movedY = scroll.scrollTop - display.wheelStartY;
+          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
+            (movedX && display.wheelDX && movedX / display.wheelDX);
+          display.wheelStartX = display.wheelStartY = null;
+          if (!sample) { return }
+          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
+          ++wheelSamples;
+        }, 200);
+      } else {
+        display.wheelDX += dx; display.wheelDY += dy;
+      }
+    }
+  }
+
+  // Selection objects are immutable. A new one is created every time
+  // the selection changes. A selection is one or more non-overlapping
+  // (and non-touching) ranges, sorted, and an integer that indicates
+  // which one is the primary selection (the one that's scrolled into
+  // view, that getCursor returns, etc).
+  var Selection = function(ranges, primIndex) {
+    this.ranges = ranges;
+    this.primIndex = primIndex;
+  };
+
+  Selection.prototype.primary = function () { return this.ranges[this.primIndex] };
+
+  Selection.prototype.equals = function (other) {
+    if (other == this) { return true }
+    if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
+    for (var i = 0; i < this.ranges.length; i++) {
+      var here = this.ranges[i], there = other.ranges[i];
+      if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
+    }
+    return true
+  };
+
+  Selection.prototype.deepCopy = function () {
+    var out = [];
+    for (var i = 0; i < this.ranges.length; i++)
+      { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }
+    return new Selection(out, this.primIndex)
+  };
+
+  Selection.prototype.somethingSelected = function () {
+    for (var i = 0; i < this.ranges.length; i++)
+      { if (!this.ranges[i].empty()) { return true } }
+    return false
+  };
+
+  Selection.prototype.contains = function (pos, end) {
+    if (!end) { end = pos; }
+    for (var i = 0; i < this.ranges.length; i++) {
+      var range = this.ranges[i];
+      if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
+        { return i }
+    }
+    return -1
+  };
+
+  var Range = function(anchor, head) {
+    this.anchor = anchor; this.head = head;
+  };
+
+  Range.prototype.from = function () { return minPos(this.anchor, this.head) };
+  Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
+  Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };
+
+  // Take an unsorted, potentially overlapping set of ranges, and
+  // build a selection out of it. 'Consumes' ranges array (modifying
+  // it).
+  function normalizeSelection(cm, ranges, primIndex) {
+    var mayTouch = cm && cm.options.selectionsMayTouch;
+    var prim = ranges[primIndex];
+    ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });
+    primIndex = indexOf(ranges, prim);
+    for (var i = 1; i < ranges.length; i++) {
+      var cur = ranges[i], prev = ranges[i - 1];
+      var diff = cmp(prev.to(), cur.from());
+      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
+        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
+        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
+        if (i <= primIndex) { --primIndex; }
+        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
+      }
+    }
+    return new Selection(ranges, primIndex)
+  }
+
+  function simpleSelection(anchor, head) {
+    return new Selection([new Range(anchor, head || anchor)], 0)
+  }
+
+  // Compute the position of the end of a change (its 'to' property
+  // refers to the pre-change end).
+  function changeEnd(change) {
+    if (!change.text) { return change.to }
+    return Pos(change.from.line + change.text.length - 1,
+               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
+  }
+
+  // Adjust a position to refer to the post-change position of the
+  // same text, or the end of the change if the change covers it.
+  function adjustForChange(pos, change) {
+    if (cmp(pos, change.from) < 0) { return pos }
+    if (cmp(pos, change.to) <= 0) { return changeEnd(change) }
+
+    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
+    if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }
+    return Pos(line, ch)
+  }
+
+  function computeSelAfterChange(doc, change) {
+    var out = [];
+    for (var i = 0; i < doc.sel.ranges.length; i++) {
+      var range = doc.sel.ranges[i];
+      out.push(new Range(adjustForChange(range.anchor, change),
+                         adjustForChange(range.head, change)));
+    }
+    return normalizeSelection(doc.cm, out, doc.sel.primIndex)
+  }
+
+  function offsetPos(pos, old, nw) {
+    if (pos.line == old.line)
+      { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
+    else
+      { return Pos(nw.line + (pos.line - old.line), pos.ch) }
+  }
+
+  // Used by replaceSelections to allow moving the selection to the
+  // start or around the replaced test. Hint may be "start" or "around".
+  function computeReplacedSel(doc, changes, hint) {
+    var out = [];
+    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
+    for (var i = 0; i < changes.length; i++) {
+      var change = changes[i];
+      var from = offsetPos(change.from, oldPrev, newPrev);
+      var to = offsetPos(changeEnd(change), oldPrev, newPrev);
+      oldPrev = change.to;
+      newPrev = to;
+      if (hint == "around") {
+        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
+        out[i] = new Range(inv ? to : from, inv ? from : to);
+      } else {
+        out[i] = new Range(from, from);
+      }
+    }
+    return new Selection(out, doc.sel.primIndex)
+  }
+
+  // Used to get the editor into a consistent state again when options change.
+
+  function loadMode(cm) {
+    cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
+    resetModeState(cm);
+  }
+
+  function resetModeState(cm) {
+    cm.doc.iter(function (line) {
+      if (line.stateAfter) { line.stateAfter = null; }
+      if (line.styles) { line.styles = null; }
+    });
+    cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
+    startWorker(cm, 100);
+    cm.state.modeGen++;
+    if (cm.curOp) { regChange(cm); }
+  }
+
+  // DOCUMENT DATA STRUCTURE
+
+  // By default, updates that start and end at the beginning of a line
+  // are treated specially, in order to make the association of line
+  // widgets and marker elements with the text behave more intuitive.
+  function isWholeLineUpdate(doc, change) {
+    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
+      (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
+  }
+
+  // Perform a change on the document data structure.
+  function updateDoc(doc, change, markedSpans, estimateHeight) {
+    function spansFor(n) {return markedSpans ? markedSpans[n] : null}
+    function update(line, text, spans) {
+      updateLine(line, text, spans, estimateHeight);
+      signalLater(line, "change", line, change);
+    }
+    function linesFor(start, end) {
+      var result = [];
+      for (var i = start; i < end; ++i)
+        { result.push(new Line(text[i], spansFor(i), estimateHeight)); }
+      return result
+    }
+
+    var from = change.from, to = change.to, text = change.text;
+    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
+    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
+
+    // Adjust the line structure
+    if (change.full) {
+      doc.insert(0, linesFor(0, text.length));
+      doc.remove(text.length, doc.size - text.length);
+    } else if (isWholeLineUpdate(doc, change)) {
+      // This is a whole-line replace. Treated specially to make
+      // sure line objects move the way they are supposed to.
+      var added = linesFor(0, text.length - 1);
+      update(lastLine, lastLine.text, lastSpans);
+      if (nlines) { doc.remove(from.line, nlines); }
+      if (added.length) { doc.insert(from.line, added); }
+    } else if (firstLine == lastLine) {
+      if (text.length == 1) {
+        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
+      } else {
+        var added$1 = linesFor(1, text.length - 1);
+        added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
+        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+        doc.insert(from.line + 1, added$1);
+      }
+    } else if (text.length == 1) {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
+      doc.remove(from.line + 1, nlines);
+    } else {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
+      var added$2 = linesFor(1, text.length - 1);
+      if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }
+      doc.insert(from.line + 1, added$2);
+    }
+
+    signalLater(doc, "change", doc, change);
+  }
+
+  // Call f for all linked documents.
+  function linkedDocs(doc, f, sharedHistOnly) {
+    function propagate(doc, skip, sharedHist) {
+      if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
+        var rel = doc.linked[i];
+        if (rel.doc == skip) { continue }
+        var shared = sharedHist && rel.sharedHist;
+        if (sharedHistOnly && !shared) { continue }
+        f(rel.doc, shared);
+        propagate(rel.doc, doc, shared);
+      } }
+    }
+    propagate(doc, null, true);
+  }
+
+  // Attach a document to an editor.
+  function attachDoc(cm, doc) {
+    if (doc.cm) { throw new Error("This document is already in use.") }
+    cm.doc = doc;
+    doc.cm = cm;
+    estimateLineHeights(cm);
+    loadMode(cm);
+    setDirectionClass(cm);
+    cm.options.direction = doc.direction;
+    if (!cm.options.lineWrapping) { findMaxLine(cm); }
+    cm.options.mode = doc.modeOption;
+    regChange(cm);
+  }
+
+  function setDirectionClass(cm) {
+  (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
+  }
+
+  function directionChanged(cm) {
+    runInOp(cm, function () {
+      setDirectionClass(cm);
+      regChange(cm);
+    });
+  }
+
+  function History(prev) {
+    // Arrays of change events and selections. Doing something adds an
+    // event to done and clears undo. Undoing moves events from done
+    // to undone, redoing moves them in the other direction.
+    this.done = []; this.undone = [];
+    this.undoDepth = prev ? prev.undoDepth : Infinity;
+    // Used to track when changes can be merged into a single undo
+    // event
+    this.lastModTime = this.lastSelTime = 0;
+    this.lastOp = this.lastSelOp = null;
+    this.lastOrigin = this.lastSelOrigin = null;
+    // Used by the isClean() method
+    this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1;
+  }
+
+  // Create a history change event from an updateDoc-style change
+  // object.
+  function historyChangeFromChange(doc, change) {
+    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
+    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
+    linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);
+    return histChange
+  }
+
+  // Pop all selection events off the end of a history array. Stop at
+  // a change event.
+  function clearSelectionEvents(array) {
+    while (array.length) {
+      var last = lst(array);
+      if (last.ranges) { array.pop(); }
+      else { break }
+    }
+  }
+
+  // Find the top change event in the history. Pop off selection
+  // events that are in the way.
+  function lastChangeEvent(hist, force) {
+    if (force) {
+      clearSelectionEvents(hist.done);
+      return lst(hist.done)
+    } else if (hist.done.length && !lst(hist.done).ranges) {
+      return lst(hist.done)
+    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
+      hist.done.pop();
+      return lst(hist.done)
+    }
+  }
+
+  // Register a change in the history. Merges changes that are within
+  // a single operation, or are close together with an origin that
+  // allows merging (starting with "+") into a single event.
+  function addChangeToHistory(doc, change, selAfter, opId) {
+    var hist = doc.history;
+    hist.undone.length = 0;
+    var time = +new Date, cur;
+    var last;
+
+    if ((hist.lastOp == opId ||
+         hist.lastOrigin == change.origin && change.origin &&
+         ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
+          change.origin.charAt(0) == "*")) &&
+        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
+      // Merge this change into the last event
+      last = lst(cur.changes);
+      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
+        // Optimized case for simple insertion -- don't want to add
+        // new changesets for every character typed
+        last.to = changeEnd(change);
+      } else {
+        // Add new sub-event
+        cur.changes.push(historyChangeFromChange(doc, change));
+      }
+    } else {
+      // Can not be merged, start a new event.
+      var before = lst(hist.done);
+      if (!before || !before.ranges)
+        { pushSelectionToHistory(doc.sel, hist.done); }
+      cur = {changes: [historyChangeFromChange(doc, change)],
+             generation: hist.generation};
+      hist.done.push(cur);
+      while (hist.done.length > hist.undoDepth) {
+        hist.done.shift();
+        if (!hist.done[0].ranges) { hist.done.shift(); }
+      }
+    }
+    hist.done.push(selAfter);
+    hist.generation = ++hist.maxGeneration;
+    hist.lastModTime = hist.lastSelTime = time;
+    hist.lastOp = hist.lastSelOp = opId;
+    hist.lastOrigin = hist.lastSelOrigin = change.origin;
+
+    if (!last) { signal(doc, "historyAdded"); }
+  }
+
+  function selectionEventCanBeMerged(doc, origin, prev, sel) {
+    var ch = origin.charAt(0);
+    return ch == "*" ||
+      ch == "+" &&
+      prev.ranges.length == sel.ranges.length &&
+      prev.somethingSelected() == sel.somethingSelected() &&
+      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
+  }
+
+  // Called whenever the selection changes, sets the new selection as
+  // the pending selection in the history, and pushes the old pending
+  // selection into the 'done' array when it was significantly
+  // different (in number of selected ranges, emptiness, or time).
+  function addSelectionToHistory(doc, sel, opId, options) {
+    var hist = doc.history, origin = options && options.origin;
+
+    // A new event is started when the previous origin does not match
+    // the current, or the origins don't allow matching. Origins
+    // starting with * are always merged, those starting with + are
+    // merged when similar and close together in time.
+    if (opId == hist.lastSelOp ||
+        (origin && hist.lastSelOrigin == origin &&
+         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
+          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
+      { hist.done[hist.done.length - 1] = sel; }
+    else
+      { pushSelectionToHistory(sel, hist.done); }
+
+    hist.lastSelTime = +new Date;
+    hist.lastSelOrigin = origin;
+    hist.lastSelOp = opId;
+    if (options && options.clearRedo !== false)
+      { clearSelectionEvents(hist.undone); }
+  }
+
+  function pushSelectionToHistory(sel, dest) {
+    var top = lst(dest);
+    if (!(top && top.ranges && top.equals(sel)))
+      { dest.push(sel); }
+  }
+
+  // Used to store marked span information in the history.
+  function attachLocalSpans(doc, change, from, to) {
+    var existing = change["spans_" + doc.id], n = 0;
+    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
+      if (line.markedSpans)
+        { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans; }
+      ++n;
+    });
+  }
+
+  // When un/re-doing restores text containing marked spans, those
+  // that have been explicitly cleared should not be restored.
+  function removeClearedSpans(spans) {
+    if (!spans) { return null }
+    var out;
+    for (var i = 0; i < spans.length; ++i) {
+      if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }
+      else if (out) { out.push(spans[i]); }
+    }
+    return !out ? spans : out.length ? out : null
+  }
+
+  // Retrieve and filter the old marked spans stored in a change event.
+  function getOldSpans(doc, change) {
+    var found = change["spans_" + doc.id];
+    if (!found) { return null }
+    var nw = [];
+    for (var i = 0; i < change.text.length; ++i)
+      { nw.push(removeClearedSpans(found[i])); }
+    return nw
+  }
+
+  // Used for un/re-doing changes from the history. Combines the
+  // result of computing the existing spans with the set of spans that
+  // existed in the history (so that deleting around a span and then
+  // undoing brings back the span).
+  function mergeOldSpans(doc, change) {
+    var old = getOldSpans(doc, change);
+    var stretched = stretchSpansOverChange(doc, change);
+    if (!old) { return stretched }
+    if (!stretched) { return old }
+
+    for (var i = 0; i < old.length; ++i) {
+      var oldCur = old[i], stretchCur = stretched[i];
+      if (oldCur && stretchCur) {
+        spans: for (var j = 0; j < stretchCur.length; ++j) {
+          var span = stretchCur[j];
+          for (var k = 0; k < oldCur.length; ++k)
+            { if (oldCur[k].marker == span.marker) { continue spans } }
+          oldCur.push(span);
+        }
+      } else if (stretchCur) {
+        old[i] = stretchCur;
+      }
+    }
+    return old
+  }
+
+  // Used both to provide a JSON-safe object in .getHistory, and, when
+  // detaching a document, to split the history in two
+  function copyHistoryArray(events, newGroup, instantiateSel) {
+    var copy = [];
+    for (var i = 0; i < events.length; ++i) {
+      var event = events[i];
+      if (event.ranges) {
+        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
+        continue
+      }
+      var changes = event.changes, newChanges = [];
+      copy.push({changes: newChanges});
+      for (var j = 0; j < changes.length; ++j) {
+        var change = changes[j], m = (void 0);
+        newChanges.push({from: change.from, to: change.to, text: change.text});
+        if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
+          if (indexOf(newGroup, Number(m[1])) > -1) {
+            lst(newChanges)[prop] = change[prop];
+            delete change[prop];
+          }
+        } } }
+      }
+    }
+    return copy
+  }
+
+  // The 'scroll' parameter given to many of these indicated whether
+  // the new cursor position should be scrolled into view after
+  // modifying the selection.
+
+  // If shift is held or the extend flag is set, extends a range to
+  // include a given position (and optionally a second position).
+  // Otherwise, simply returns the range between the given positions.
+  // Used for cursor motion and such.
+  function extendRange(range, head, other, extend) {
+    if (extend) {
+      var anchor = range.anchor;
+      if (other) {
+        var posBefore = cmp(head, anchor) < 0;
+        if (posBefore != (cmp(other, anchor) < 0)) {
+          anchor = head;
+          head = other;
+        } else if (posBefore != (cmp(head, other) < 0)) {
+          head = other;
+        }
+      }
+      return new Range(anchor, head)
+    } else {
+      return new Range(other || head, head)
+    }
+  }
+
+  // Extend the primary selection range, discard the rest.
+  function extendSelection(doc, head, other, options, extend) {
+    if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }
+    setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
+  }
+
+  // Extend all selections (pos is an array of selections with length
+  // equal the number of selections)
+  function extendSelections(doc, heads, options) {
+    var out = [];
+    var extend = doc.cm && (doc.cm.display.shift || doc.extend);
+    for (var i = 0; i < doc.sel.ranges.length; i++)
+      { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }
+    var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
+    setSelection(doc, newSel, options);
+  }
+
+  // Updates a single range in the selection.
+  function replaceOneSelection(doc, i, range, options) {
+    var ranges = doc.sel.ranges.slice(0);
+    ranges[i] = range;
+    setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);
+  }
+
+  // Reset the selection to a single range.
+  function setSimpleSelection(doc, anchor, head, options) {
+    setSelection(doc, simpleSelection(anchor, head), options);
+  }
+
+  // Give beforeSelectionChange handlers a change to influence a
+  // selection update.
+  function filterSelectionChange(doc, sel, options) {
+    var obj = {
+      ranges: sel.ranges,
+      update: function(ranges) {
+        this.ranges = [];
+        for (var i = 0; i < ranges.length; i++)
+          { this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
+                                     clipPos(doc, ranges[i].head)); }
+      },
+      origin: options && options.origin
+    };
+    signal(doc, "beforeSelectionChange", doc, obj);
+    if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj); }
+    if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }
+    else { return sel }
+  }
+
+  function setSelectionReplaceHistory(doc, sel, options) {
+    var done = doc.history.done, last = lst(done);
+    if (last && last.ranges) {
+      done[done.length - 1] = sel;
+      setSelectionNoUndo(doc, sel, options);
+    } else {
+      setSelection(doc, sel, options);
+    }
+  }
+
+  // Set a new selection.
+  function setSelection(doc, sel, options) {
+    setSelectionNoUndo(doc, sel, options);
+    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
+  }
+
+  function setSelectionNoUndo(doc, sel, options) {
+    if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
+      { sel = filterSelectionChange(doc, sel, options); }
+
+    var bias = options && options.bias ||
+      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
+    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
+
+    if (!(options && options.scroll === false) && doc.cm && doc.cm.getOption("readOnly") != "nocursor")
+      { ensureCursorVisible(doc.cm); }
+  }
+
+  function setSelectionInner(doc, sel) {
+    if (sel.equals(doc.sel)) { return }
+
+    doc.sel = sel;
+
+    if (doc.cm) {
+      doc.cm.curOp.updateInput = 1;
+      doc.cm.curOp.selectionChanged = true;
+      signalCursorActivity(doc.cm);
+    }
+    signalLater(doc, "cursorActivity", doc);
+  }
+
+  // Verify that the selection does not partially select any atomic
+  // marked ranges.
+  function reCheckSelection(doc) {
+    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
+  }
+
+  // Return a selection that does not partially select any atomic
+  // ranges.
+  function skipAtomicInSelection(doc, sel, bias, mayClear) {
+    var out;
+    for (var i = 0; i < sel.ranges.length; i++) {
+      var range = sel.ranges[i];
+      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
+      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
+      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
+      if (out || newAnchor != range.anchor || newHead != range.head) {
+        if (!out) { out = sel.ranges.slice(0, i); }
+        out[i] = new Range(newAnchor, newHead);
+      }
+    }
+    return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
+  }
+
+  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
+    var line = getLine(doc, pos.line);
+    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
+      var sp = line.markedSpans[i], m = sp.marker;
+
+      // Determine if we should prevent the cursor being placed to the left/right of an atomic marker
+      // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
+      // is with selectLeft/Right
+      var preventCursorLeft = ("selectLeft" in m) ? !m.selectLeft : m.inclusiveLeft;
+      var preventCursorRight = ("selectRight" in m) ? !m.selectRight : m.inclusiveRight;
+
+      if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
+          (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
+        if (mayClear) {
+          signal(m, "beforeCursorEnter");
+          if (m.explicitlyCleared) {
+            if (!line.markedSpans) { break }
+            else {--i; continue}
+          }
+        }
+        if (!m.atomic) { continue }
+
+        if (oldPos) {
+          var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
+          if (dir < 0 ? preventCursorRight : preventCursorLeft)
+            { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }
+          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
+            { return skipAtomicInner(doc, near, pos, dir, mayClear) }
+        }
+
+        var far = m.find(dir < 0 ? -1 : 1);
+        if (dir < 0 ? preventCursorLeft : preventCursorRight)
+          { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }
+        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
+      }
+    } }
+    return pos
+  }
+
+  // Ensure a given position is not inside an atomic range.
+  function skipAtomic(doc, pos, oldPos, bias, mayClear) {
+    var dir = bias || 1;
+    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
+        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
+        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
+        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
+    if (!found) {
+      doc.cantEdit = true;
+      return Pos(doc.first, 0)
+    }
+    return found
+  }
+
+  function movePos(doc, pos, dir, line) {
+    if (dir < 0 && pos.ch == 0) {
+      if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
+      else { return null }
+    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
+      if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
+      else { return null }
+    } else {
+      return new Pos(pos.line, pos.ch + dir)
+    }
+  }
+
+  function selectAll(cm) {
+    cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
+  }
+
+  // UPDATING
+
+  // Allow "beforeChange" event handlers to influence a change
+  function filterChange(doc, change, update) {
+    var obj = {
+      canceled: false,
+      from: change.from,
+      to: change.to,
+      text: change.text,
+      origin: change.origin,
+      cancel: function () { return obj.canceled = true; }
+    };
+    if (update) { obj.update = function (from, to, text, origin) {
+      if (from) { obj.from = clipPos(doc, from); }
+      if (to) { obj.to = clipPos(doc, to); }
+      if (text) { obj.text = text; }
+      if (origin !== undefined) { obj.origin = origin; }
+    }; }
+    signal(doc, "beforeChange", doc, obj);
+    if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj); }
+
+    if (obj.canceled) {
+      if (doc.cm) { doc.cm.curOp.updateInput = 2; }
+      return null
+    }
+    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
+  }
+
+  // Apply a change to a document, and add it to the document's
+  // history, and propagating it to all linked documents.
+  function makeChange(doc, change, ignoreReadOnly) {
+    if (doc.cm) {
+      if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
+      if (doc.cm.state.suppressEdits) { return }
+    }
+
+    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
+      change = filterChange(doc, change, true);
+      if (!change) { return }
+    }
+
+    // Possibly split or suppress the update based on the presence
+    // of read-only spans in its range.
+    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
+    if (split) {
+      for (var i = split.length - 1; i >= 0; --i)
+        { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin}); }
+    } else {
+      makeChangeInner(doc, change);
+    }
+  }
+
+  function makeChangeInner(doc, change) {
+    if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
+    var selAfter = computeSelAfterChange(doc, change);
+    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
+
+    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
+    var rebased = [];
+
+    linkedDocs(doc, function (doc, sharedHist) {
+      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+        rebaseHist(doc.history, change);
+        rebased.push(doc.history);
+      }
+      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
+    });
+  }
+
+  // Revert a change stored in a document's history.
+  function makeChangeFromHistory(doc, type, allowSelectionOnly) {
+    var suppress = doc.cm && doc.cm.state.suppressEdits;
+    if (suppress && !allowSelectionOnly) { return }
+
+    var hist = doc.history, event, selAfter = doc.sel;
+    var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
+
+    // Verify that there is a useable event (so that ctrl-z won't
+    // needlessly clear selection events)
+    var i = 0;
+    for (; i < source.length; i++) {
+      event = source[i];
+      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
+        { break }
+    }
+    if (i == source.length) { return }
+    hist.lastOrigin = hist.lastSelOrigin = null;
+
+    for (;;) {
+      event = source.pop();
+      if (event.ranges) {
+        pushSelectionToHistory(event, dest);
+        if (allowSelectionOnly && !event.equals(doc.sel)) {
+          setSelection(doc, event, {clearRedo: false});
+          return
+        }
+        selAfter = event;
+      } else if (suppress) {
+        source.push(event);
+        return
+      } else { break }
+    }
+
+    // Build up a reverse change object to add to the opposite history
+    // stack (redo when undoing, and vice versa).
+    var antiChanges = [];
+    pushSelectionToHistory(selAfter, dest);
+    dest.push({changes: antiChanges, generation: hist.generation});
+    hist.generation = event.generation || ++hist.maxGeneration;
+
+    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
+
+    var loop = function ( i ) {
+      var change = event.changes[i];
+      change.origin = type;
+      if (filter && !filterChange(doc, change, false)) {
+        source.length = 0;
+        return {}
+      }
+
+      antiChanges.push(historyChangeFromChange(doc, change));
+
+      var after = i ? computeSelAfterChange(doc, change) : lst(source);
+      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
+      if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }
+      var rebased = [];
+
+      // Propagate to the linked documents
+      linkedDocs(doc, function (doc, sharedHist) {
+        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+          rebaseHist(doc.history, change);
+          rebased.push(doc.history);
+        }
+        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
+      });
+    };
+
+    for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
+      var returned = loop( i$1 );
+
+      if ( returned ) return returned.v;
+    }
+  }
+
+  // Sub-views need their line numbers shifted when text is added
+  // above or below them in the parent document.
+  function shiftDoc(doc, distance) {
+    if (distance == 0) { return }
+    doc.first += distance;
+    doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
+      Pos(range.anchor.line + distance, range.anchor.ch),
+      Pos(range.head.line + distance, range.head.ch)
+    ); }), doc.sel.primIndex);
+    if (doc.cm) {
+      regChange(doc.cm, doc.first, doc.first - distance, distance);
+      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
+        { regLineChange(doc.cm, l, "gutter"); }
+    }
+  }
+
+  // More lower-level change function, handling only a single document
+  // (not linked ones).
+  function makeChangeSingleDoc(doc, change, selAfter, spans) {
+    if (doc.cm && !doc.cm.curOp)
+      { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }
+
+    if (change.to.line < doc.first) {
+      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
+      return
+    }
+    if (change.from.line > doc.lastLine()) { return }
+
+    // Clip the change to the size of this doc
+    if (change.from.line < doc.first) {
+      var shift = change.text.length - 1 - (doc.first - change.from.line);
+      shiftDoc(doc, shift);
+      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
+                text: [lst(change.text)], origin: change.origin};
+    }
+    var last = doc.lastLine();
+    if (change.to.line > last) {
+      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
+                text: [change.text[0]], origin: change.origin};
+    }
+
+    change.removed = getBetween(doc, change.from, change.to);
+
+    if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }
+    if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }
+    else { updateDoc(doc, change, spans); }
+    setSelectionNoUndo(doc, selAfter, sel_dontScroll);
+
+    if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0)))
+      { doc.cantEdit = false; }
+  }
+
+  // Handle the interaction of a change to a document with the editor
+  // that this document is part of.
+  function makeChangeSingleDocInEditor(cm, change, spans) {
+    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
+
+    var recomputeMaxLength = false, checkWidthStart = from.line;
+    if (!cm.options.lineWrapping) {
+      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
+      doc.iter(checkWidthStart, to.line + 1, function (line) {
+        if (line == display.maxLine) {
+          recomputeMaxLength = true;
+          return true
+        }
+      });
+    }
+
+    if (doc.sel.contains(change.from, change.to) > -1)
+      { signalCursorActivity(cm); }
+
+    updateDoc(doc, change, spans, estimateHeight(cm));
+
+    if (!cm.options.lineWrapping) {
+      doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
+        var len = lineLength(line);
+        if (len > display.maxLineLength) {
+          display.maxLine = line;
+          display.maxLineLength = len;
+          display.maxLineChanged = true;
+          recomputeMaxLength = false;
+        }
+      });
+      if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }
+    }
+
+    retreatFrontier(doc, from.line);
+    startWorker(cm, 400);
+
+    var lendiff = change.text.length - (to.line - from.line) - 1;
+    // Remember that these lines changed, for updating the display
+    if (change.full)
+      { regChange(cm); }
+    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
+      { regLineChange(cm, from.line, "text"); }
+    else
+      { regChange(cm, from.line, to.line + 1, lendiff); }
+
+    var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
+    if (changeHandler || changesHandler) {
+      var obj = {
+        from: from, to: to,
+        text: change.text,
+        removed: change.removed,
+        origin: change.origin
+      };
+      if (changeHandler) { signalLater(cm, "change", cm, obj); }
+      if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }
+    }
+    cm.display.selForContextMenu = null;
+  }
+
+  function replaceRange(doc, code, from, to, origin) {
+    var assign;
+
+    if (!to) { to = from; }
+    if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }
+    if (typeof code == "string") { code = doc.splitLines(code); }
+    makeChange(doc, {from: from, to: to, text: code, origin: origin});
+  }
+
+  // Rebasing/resetting history to deal with externally-sourced changes
+
+  function rebaseHistSelSingle(pos, from, to, diff) {
+    if (to < pos.line) {
+      pos.line += diff;
+    } else if (from < pos.line) {
+      pos.line = from;
+      pos.ch = 0;
+    }
+  }
+
+  // Tries to rebase an array of history events given a change in the
+  // document. If the change touches the same lines as the event, the
+  // event, and everything 'behind' it, is discarded. If the change is
+  // before the event, the event's positions are updated. Uses a
+  // copy-on-write scheme for the positions, to avoid having to
+  // reallocate them all on every rebase, but also avoid problems with
+  // shared position objects being unsafely updated.
+  function rebaseHistArray(array, from, to, diff) {
+    for (var i = 0; i < array.length; ++i) {
+      var sub = array[i], ok = true;
+      if (sub.ranges) {
+        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
+        for (var j = 0; j < sub.ranges.length; j++) {
+          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
+          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
+        }
+        continue
+      }
+      for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
+        var cur = sub.changes[j$1];
+        if (to < cur.from.line) {
+          cur.from = Pos(cur.from.line + diff, cur.from.ch);
+          cur.to = Pos(cur.to.line + diff, cur.to.ch);
+        } else if (from <= cur.to.line) {
+          ok = false;
+          break
+        }
+      }
+      if (!ok) {
+        array.splice(0, i + 1);
+        i = 0;
+      }
+    }
+  }
+
+  function rebaseHist(hist, change) {
+    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
+    rebaseHistArray(hist.done, from, to, diff);
+    rebaseHistArray(hist.undone, from, to, diff);
+  }
+
+  // Utility for applying a change to a line by handle or number,
+  // returning the number and optionally registering the line as
+  // changed.
+  function changeLine(doc, handle, changeType, op) {
+    var no = handle, line = handle;
+    if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)); }
+    else { no = lineNo(handle); }
+    if (no == null) { return null }
+    if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }
+    return line
+  }
+
+  // The document is represented as a BTree consisting of leaves, with
+  // chunk of lines in them, and branches, with up to ten leaves or
+  // other branch nodes below them. The top node is always a branch
+  // node, and is the document object itself (meaning it has
+  // additional methods and properties).
+  //
+  // All nodes have parent links. The tree is used both to go from
+  // line numbers to line objects, and to go from objects to numbers.
+  // It also indexes by height, and is used to convert between height
+  // and line object, and to find the total height of the document.
+  //
+  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
+
+  function LeafChunk(lines) {
+    this.lines = lines;
+    this.parent = null;
+    var height = 0;
+    for (var i = 0; i < lines.length; ++i) {
+      lines[i].parent = this;
+      height += lines[i].height;
+    }
+    this.height = height;
+  }
+
+  LeafChunk.prototype = {
+    chunkSize: function() { return this.lines.length },
+
+    // Remove the n lines at offset 'at'.
+    removeInner: function(at, n) {
+      for (var i = at, e = at + n; i < e; ++i) {
+        var line = this.lines[i];
+        this.height -= line.height;
+        cleanUpLine(line);
+        signalLater(line, "delete");
+      }
+      this.lines.splice(at, n);
+    },
+
+    // Helper used to collapse a small branch into a single leaf.
+    collapse: function(lines) {
+      lines.push.apply(lines, this.lines);
+    },
+
+    // Insert the given array of lines at offset 'at', count them as
+    // having the given height.
+    insertInner: function(at, lines, height) {
+      this.height += height;
+      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
+      for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }
+    },
+
+    // Used to iterate over a part of the tree.
+    iterN: function(at, n, op) {
+      for (var e = at + n; at < e; ++at)
+        { if (op(this.lines[at])) { return true } }
+    }
+  };
+
+  function BranchChunk(children) {
+    this.children = children;
+    var size = 0, height = 0;
+    for (var i = 0; i < children.length; ++i) {
+      var ch = children[i];
+      size += ch.chunkSize(); height += ch.height;
+      ch.parent = this;
+    }
+    this.size = size;
+    this.height = height;
+    this.parent = null;
+  }
+
+  BranchChunk.prototype = {
+    chunkSize: function() { return this.size },
+
+    removeInner: function(at, n) {
+      this.size -= n;
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var rm = Math.min(n, sz - at), oldHeight = child.height;
+          child.removeInner(at, rm);
+          this.height -= oldHeight - child.height;
+          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
+          if ((n -= rm) == 0) { break }
+          at = 0;
+        } else { at -= sz; }
+      }
+      // If the result is smaller than 25 lines, ensure that it is a
+      // single leaf node.
+      if (this.size - n < 25 &&
+          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
+        var lines = [];
+        this.collapse(lines);
+        this.children = [new LeafChunk(lines)];
+        this.children[0].parent = this;
+      }
+    },
+
+    collapse: function(lines) {
+      for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }
+    },
+
+    insertInner: function(at, lines, height) {
+      this.size += lines.length;
+      this.height += height;
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at <= sz) {
+          child.insertInner(at, lines, height);
+          if (child.lines && child.lines.length > 50) {
+            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
+            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
+            var remaining = child.lines.length % 25 + 25;
+            for (var pos = remaining; pos < child.lines.length;) {
+              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
+              child.height -= leaf.height;
+              this.children.splice(++i, 0, leaf);
+              leaf.parent = this;
+            }
+            child.lines = child.lines.slice(0, remaining);
+            this.maybeSpill();
+          }
+          break
+        }
+        at -= sz;
+      }
+    },
+
+    // When a node has grown, check whether it should be split.
+    maybeSpill: function() {
+      if (this.children.length <= 10) { return }
+      var me = this;
+      do {
+        var spilled = me.children.splice(me.children.length - 5, 5);
+        var sibling = new BranchChunk(spilled);
+        if (!me.parent) { // Become the parent node
+          var copy = new BranchChunk(me.children);
+          copy.parent = me;
+          me.children = [copy, sibling];
+          me = copy;
+       } else {
+          me.size -= sibling.size;
+          me.height -= sibling.height;
+          var myIndex = indexOf(me.parent.children, me);
+          me.parent.children.splice(myIndex + 1, 0, sibling);
+        }
+        sibling.parent = me.parent;
+      } while (me.children.length > 10)
+      me.parent.maybeSpill();
+    },
+
+    iterN: function(at, n, op) {
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var used = Math.min(n, sz - at);
+          if (child.iterN(at, used, op)) { return true }
+          if ((n -= used) == 0) { break }
+          at = 0;
+        } else { at -= sz; }
+      }
+    }
+  };
+
+  // Line widgets are block elements displayed above or below a line.
+
+  var LineWidget = function(doc, node, options) {
+    if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
+      { this[opt] = options[opt]; } } }
+    this.doc = doc;
+    this.node = node;
+  };
+
+  LineWidget.prototype.clear = function () {
+    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
+    if (no == null || !ws) { return }
+    for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }
+    if (!ws.length) { line.widgets = null; }
+    var height = widgetHeight(this);
+    updateLineHeight(line, Math.max(0, line.height - height));
+    if (cm) {
+      runInOp(cm, function () {
+        adjustScrollWhenAboveVisible(cm, line, -height);
+        regLineChange(cm, no, "widget");
+      });
+      signalLater(cm, "lineWidgetCleared", cm, this, no);
+    }
+  };
+
+  LineWidget.prototype.changed = function () {
+      var this$1 = this;
+
+    var oldH = this.height, cm = this.doc.cm, line = this.line;
+    this.height = null;
+    var diff = widgetHeight(this) - oldH;
+    if (!diff) { return }
+    if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }
+    if (cm) {
+      runInOp(cm, function () {
+        cm.curOp.forceUpdate = true;
+        adjustScrollWhenAboveVisible(cm, line, diff);
+        signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
+      });
+    }
+  };
+  eventMixin(LineWidget);
+
+  function adjustScrollWhenAboveVisible(cm, line, diff) {
+    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
+      { addToScrollTop(cm, diff); }
+  }
+
+  function addLineWidget(doc, handle, node, options) {
+    var widget = new LineWidget(doc, node, options);
+    var cm = doc.cm;
+    if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }
+    changeLine(doc, handle, "widget", function (line) {
+      var widgets = line.widgets || (line.widgets = []);
+      if (widget.insertAt == null) { widgets.push(widget); }
+      else { widgets.splice(Math.min(widgets.length, Math.max(0, widget.insertAt)), 0, widget); }
+      widget.line = line;
+      if (cm && !lineIsHidden(doc, line)) {
+        var aboveVisible = heightAtLine(line) < doc.scrollTop;
+        updateLineHeight(line, line.height + widgetHeight(widget));
+        if (aboveVisible) { addToScrollTop(cm, widget.height); }
+        cm.curOp.forceUpdate = true;
+      }
+      return true
+    });
+    if (cm) { signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle)); }
+    return widget
+  }
+
+  // TEXTMARKERS
+
+  // Created with markText and setBookmark methods. A TextMarker is a
+  // handle that can be used to clear or find a marked position in the
+  // document. Line objects hold arrays (markedSpans) containing
+  // {from, to, marker} object pointing to such marker objects, and
+  // indicating that such a marker is present on that line. Multiple
+  // lines may point to the same marker when it spans across lines.
+  // The spans will have null for their from/to properties when the
+  // marker continues beyond the start/end of the line. Markers have
+  // links back to the lines they currently touch.
+
+  // Collapsed markers have unique ids, in order to be able to order
+  // them, which is needed for uniquely determining an outer marker
+  // when they overlap (they may nest, but not partially overlap).
+  var nextMarkerId = 0;
+
+  var TextMarker = function(doc, type) {
+    this.lines = [];
+    this.type = type;
+    this.doc = doc;
+    this.id = ++nextMarkerId;
+  };
+
+  // Clear the marker.
+  TextMarker.prototype.clear = function () {
+    if (this.explicitlyCleared) { return }
+    var cm = this.doc.cm, withOp = cm && !cm.curOp;
+    if (withOp) { startOperation(cm); }
+    if (hasHandler(this, "clear")) {
+      var found = this.find();
+      if (found) { signalLater(this, "clear", found.from, found.to); }
+    }
+    var min = null, max = null;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), "text"); }
+      else if (cm) {
+        if (span.to != null) { max = lineNo(line); }
+        if (span.from != null) { min = lineNo(line); }
+      }
+      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
+      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
+        { updateLineHeight(line, textHeight(cm.display)); }
+    }
+    if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
+      var visual = visualLine(this.lines[i$1]), len = lineLength(visual);
+      if (len > cm.display.maxLineLength) {
+        cm.display.maxLine = visual;
+        cm.display.maxLineLength = len;
+        cm.display.maxLineChanged = true;
+      }
+    } }
+
+    if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }
+    this.lines.length = 0;
+    this.explicitlyCleared = true;
+    if (this.atomic && this.doc.cantEdit) {
+      this.doc.cantEdit = false;
+      if (cm) { reCheckSelection(cm.doc); }
+    }
+    if (cm) { signalLater(cm, "markerCleared", cm, this, min, max); }
+    if (withOp) { endOperation(cm); }
+    if (this.parent) { this.parent.clear(); }
+  };
+
+  // Find the position of the marker in the document. Returns a {from,
+  // to} object by default. Side can be passed to get a specific side
+  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
+  // Pos objects returned contain a line object, rather than a line
+  // number (used to prevent looking up the same line twice).
+  TextMarker.prototype.find = function (side, lineObj) {
+    if (side == null && this.type == "bookmark") { side = 1; }
+    var from, to;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (span.from != null) {
+        from = Pos(lineObj ? line : lineNo(line), span.from);
+        if (side == -1) { return from }
+      }
+      if (span.to != null) {
+        to = Pos(lineObj ? line : lineNo(line), span.to);
+        if (side == 1) { return to }
+      }
+    }
+    return from && {from: from, to: to}
+  };
+
+  // Signals that the marker's widget changed, and surrounding layout
+  // should be recomputed.
+  TextMarker.prototype.changed = function () {
+      var this$1 = this;
+
+    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
+    if (!pos || !cm) { return }
+    runInOp(cm, function () {
+      var line = pos.line, lineN = lineNo(pos.line);
+      var view = findViewForLine(cm, lineN);
+      if (view) {
+        clearLineMeasurementCacheFor(view);
+        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
+      }
+      cm.curOp.updateMaxLine = true;
+      if (!lineIsHidden(widget.doc, line) && widget.height != null) {
+        var oldHeight = widget.height;
+        widget.height = null;
+        var dHeight = widgetHeight(widget) - oldHeight;
+        if (dHeight)
+          { updateLineHeight(line, line.height + dHeight); }
+      }
+      signalLater(cm, "markerChanged", cm, this$1);
+    });
+  };
+
+  TextMarker.prototype.attachLine = function (line) {
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp;
+      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
+        { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }
+    }
+    this.lines.push(line);
+  };
+
+  TextMarker.prototype.detachLine = function (line) {
+    this.lines.splice(indexOf(this.lines, line), 1);
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp
+      ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
+    }
+  };
+  eventMixin(TextMarker);
+
+  // Create a marker, wire it up to the right lines, and
+  function markText(doc, from, to, options, type) {
+    // Shared markers (across linked documents) are handled separately
+    // (markTextShared will call out to this again, once per
+    // document).
+    if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
+    // Ensure we are in an operation.
+    if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }
+
+    var marker = new TextMarker(doc, type), diff = cmp(from, to);
+    if (options) { copyObj(options, marker, false); }
+    // Don't connect empty markers unless clearWhenEmpty is false
+    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
+      { return marker }
+    if (marker.replacedWith) {
+      // Showing up as a widget implies collapsed (widget replaces text)
+      marker.collapsed = true;
+      marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
+      if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true"); }
+      if (options.insertLeft) { marker.widgetNode.insertLeft = true; }
+    }
+    if (marker.collapsed) {
+      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
+          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
+        { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
+      seeCollapsedSpans();
+    }
+
+    if (marker.addToHistory)
+      { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN); }
+
+    var curLine = from.line, cm = doc.cm, updateMaxLine;
+    doc.iter(curLine, to.line + 1, function (line) {
+      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
+        { updateMaxLine = true; }
+      if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }
+      addMarkedSpan(line, new MarkedSpan(marker,
+                                         curLine == from.line ? from.ch : null,
+                                         curLine == to.line ? to.ch : null), doc.cm && doc.cm.curOp);
+      ++curLine;
+    });
+    // lineIsHidden depends on the presence of the spans, so needs a second pass
+    if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
+      if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }
+    }); }
+
+    if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }); }
+
+    if (marker.readOnly) {
+      seeReadOnlySpans();
+      if (doc.history.done.length || doc.history.undone.length)
+        { doc.clearHistory(); }
+    }
+    if (marker.collapsed) {
+      marker.id = ++nextMarkerId;
+      marker.atomic = true;
+    }
+    if (cm) {
+      // Sync editor state
+      if (updateMaxLine) { cm.curOp.updateMaxLine = true; }
+      if (marker.collapsed)
+        { regChange(cm, from.line, to.line + 1); }
+      else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||
+               marker.attributes || marker.title)
+        { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text"); } }
+      if (marker.atomic) { reCheckSelection(cm.doc); }
+      signalLater(cm, "markerAdded", cm, marker);
+    }
+    return marker
+  }
+
+  // SHARED TEXTMARKERS
+
+  // A shared marker spans multiple linked documents. It is
+  // implemented as a meta-marker-object controlling multiple normal
+  // markers.
+  var SharedTextMarker = function(markers, primary) {
+    this.markers = markers;
+    this.primary = primary;
+    for (var i = 0; i < markers.length; ++i)
+      { markers[i].parent = this; }
+  };
+
+  SharedTextMarker.prototype.clear = function () {
+    if (this.explicitlyCleared) { return }
+    this.explicitlyCleared = true;
+    for (var i = 0; i < this.markers.length; ++i)
+      { this.markers[i].clear(); }
+    signalLater(this, "clear");
+  };
+
+  SharedTextMarker.prototype.find = function (side, lineObj) {
+    return this.primary.find(side, lineObj)
+  };
+  eventMixin(SharedTextMarker);
+
+  function markTextShared(doc, from, to, options, type) {
+    options = copyObj(options);
+    options.shared = false;
+    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
+    var widget = options.widgetNode;
+    linkedDocs(doc, function (doc) {
+      if (widget) { options.widgetNode = widget.cloneNode(true); }
+      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
+      for (var i = 0; i < doc.linked.length; ++i)
+        { if (doc.linked[i].isParent) { return } }
+      primary = lst(markers);
+    });
+    return new SharedTextMarker(markers, primary)
+  }
+
+  function findSharedMarkers(doc) {
+    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
+  }
+
+  function copySharedMarkers(doc, markers) {
+    for (var i = 0; i < markers.length; i++) {
+      var marker = markers[i], pos = marker.find();
+      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
+      if (cmp(mFrom, mTo)) {
+        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
+        marker.markers.push(subMark);
+        subMark.parent = marker;
+      }
+    }
+  }
+
+  function detachSharedMarkers(markers) {
+    var loop = function ( i ) {
+      var marker = markers[i], linked = [marker.primary.doc];
+      linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });
+      for (var j = 0; j < marker.markers.length; j++) {
+        var subMarker = marker.markers[j];
+        if (indexOf(linked, subMarker.doc) == -1) {
+          subMarker.parent = null;
+          marker.markers.splice(j--, 1);
+        }
+      }
+    };
+
+    for (var i = 0; i < markers.length; i++) loop( i );
+  }
+
+  var nextDocId = 0;
+  var Doc = function(text, mode, firstLine, lineSep, direction) {
+    if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
+    if (firstLine == null) { firstLine = 0; }
+
+    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
+    this.first = firstLine;
+    this.scrollTop = this.scrollLeft = 0;
+    this.cantEdit = false;
+    this.cleanGeneration = 1;
+    this.modeFrontier = this.highlightFrontier = firstLine;
+    var start = Pos(firstLine, 0);
+    this.sel = simpleSelection(start);
+    this.history = new History(null);
+    this.id = ++nextDocId;
+    this.modeOption = mode;
+    this.lineSep = lineSep;
+    this.direction = (direction == "rtl") ? "rtl" : "ltr";
+    this.extend = false;
+
+    if (typeof text == "string") { text = this.splitLines(text); }
+    updateDoc(this, {from: start, to: start, text: text});
+    setSelection(this, simpleSelection(start), sel_dontScroll);
+  };
+
+  Doc.prototype = createObj(BranchChunk.prototype, {
+    constructor: Doc,
+    // Iterate over the document. Supports two forms -- with only one
+    // argument, it calls that for each line in the document. With
+    // three, it iterates over the range given by the first two (with
+    // the second being non-inclusive).
+    iter: function(from, to, op) {
+      if (op) { this.iterN(from - this.first, to - from, op); }
+      else { this.iterN(this.first, this.first + this.size, from); }
+    },
+
+    // Non-public interface for adding and removing lines.
+    insert: function(at, lines) {
+      var height = 0;
+      for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }
+      this.insertInner(at - this.first, lines, height);
+    },
+    remove: function(at, n) { this.removeInner(at - this.first, n); },
+
+    // From here, the methods are part of the public interface. Most
+    // are also available from CodeMirror (editor) instances.
+
+    getValue: function(lineSep) {
+      var lines = getLines(this, this.first, this.first + this.size);
+      if (lineSep === false) { return lines }
+      return lines.join(lineSep || this.lineSeparator())
+    },
+    setValue: docMethodOp(function(code) {
+      var top = Pos(this.first, 0), last = this.first + this.size - 1;
+      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
+                        text: this.splitLines(code), origin: "setValue", full: true}, true);
+      if (this.cm) { scrollToCoords(this.cm, 0, 0); }
+      setSelection(this, simpleSelection(top), sel_dontScroll);
+    }),
+    replaceRange: function(code, from, to, origin) {
+      from = clipPos(this, from);
+      to = to ? clipPos(this, to) : from;
+      replaceRange(this, code, from, to, origin);
+    },
+    getRange: function(from, to, lineSep) {
+      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
+      if (lineSep === false) { return lines }
+      if (lineSep === '') { return lines.join('') }
+      return lines.join(lineSep || this.lineSeparator())
+    },
+
+    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},
+
+    getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
+    getLineNumber: function(line) {return lineNo(line)},
+
+    getLineHandleVisualStart: function(line) {
+      if (typeof line == "number") { line = getLine(this, line); }
+      return visualLine(line)
+    },
+
+    lineCount: function() {return this.size},
+    firstLine: function() {return this.first},
+    lastLine: function() {return this.first + this.size - 1},
+
+    clipPos: function(pos) {return clipPos(this, pos)},
+
+    getCursor: function(start) {
+      var range = this.sel.primary(), pos;
+      if (start == null || start == "head") { pos = range.head; }
+      else if (start == "anchor") { pos = range.anchor; }
+      else if (start == "end" || start == "to" || start === false) { pos = range.to(); }
+      else { pos = range.from(); }
+      return pos
+    },
+    listSelections: function() { return this.sel.ranges },
+    somethingSelected: function() {return this.sel.somethingSelected()},
+
+    setCursor: docMethodOp(function(line, ch, options) {
+      setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
+    }),
+    setSelection: docMethodOp(function(anchor, head, options) {
+      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
+    }),
+    extendSelection: docMethodOp(function(head, other, options) {
+      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
+    }),
+    extendSelections: docMethodOp(function(heads, options) {
+      extendSelections(this, clipPosArray(this, heads), options);
+    }),
+    extendSelectionsBy: docMethodOp(function(f, options) {
+      var heads = map(this.sel.ranges, f);
+      extendSelections(this, clipPosArray(this, heads), options);
+    }),
+    setSelections: docMethodOp(function(ranges, primary, options) {
+      if (!ranges.length) { return }
+      var out = [];
+      for (var i = 0; i < ranges.length; i++)
+        { out[i] = new Range(clipPos(this, ranges[i].anchor),
+                           clipPos(this, ranges[i].head || ranges[i].anchor)); }
+      if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }
+      setSelection(this, normalizeSelection(this.cm, out, primary), options);
+    }),
+    addSelection: docMethodOp(function(anchor, head, options) {
+      var ranges = this.sel.ranges.slice(0);
+      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
+      setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);
+    }),
+
+    getSelection: function(lineSep) {
+      var ranges = this.sel.ranges, lines;
+      for (var i = 0; i < ranges.length; i++) {
+        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
+        lines = lines ? lines.concat(sel) : sel;
+      }
+      if (lineSep === false) { return lines }
+      else { return lines.join(lineSep || this.lineSeparator()) }
+    },
+    getSelections: function(lineSep) {
+      var parts = [], ranges = this.sel.ranges;
+      for (var i = 0; i < ranges.length; i++) {
+        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
+        if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }
+        parts[i] = sel;
+      }
+      return parts
+    },
+    replaceSelection: function(code, collapse, origin) {
+      var dup = [];
+      for (var i = 0; i < this.sel.ranges.length; i++)
+        { dup[i] = code; }
+      this.replaceSelections(dup, collapse, origin || "+input");
+    },
+    replaceSelections: docMethodOp(function(code, collapse, origin) {
+      var changes = [], sel = this.sel;
+      for (var i = 0; i < sel.ranges.length; i++) {
+        var range = sel.ranges[i];
+        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
+      }
+      var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
+      for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
+        { makeChange(this, changes[i$1]); }
+      if (newSel) { setSelectionReplaceHistory(this, newSel); }
+      else if (this.cm) { ensureCursorVisible(this.cm); }
+    }),
+    undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
+    redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
+    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
+    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),
+
+    setExtending: function(val) {this.extend = val;},
+    getExtending: function() {return this.extend},
+
+    historySize: function() {
+      var hist = this.history, done = 0, undone = 0;
+      for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }
+      for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }
+      return {undo: done, redo: undone}
+    },
+    clearHistory: function() {
+      var this$1 = this;
+
+      this.history = new History(this.history);
+      linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);
+    },
+
+    markClean: function() {
+      this.cleanGeneration = this.changeGeneration(true);
+    },
+    changeGeneration: function(forceSplit) {
+      if (forceSplit)
+        { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }
+      return this.history.generation
+    },
+    isClean: function (gen) {
+      return this.history.generation == (gen || this.cleanGeneration)
+    },
+
+    getHistory: function() {
+      return {done: copyHistoryArray(this.history.done),
+              undone: copyHistoryArray(this.history.undone)}
+    },
+    setHistory: function(histData) {
+      var hist = this.history = new History(this.history);
+      hist.done = copyHistoryArray(histData.done.slice(0), null, true);
+      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
+    },
+
+    setGutterMarker: docMethodOp(function(line, gutterID, value) {
+      return changeLine(this, line, "gutter", function (line) {
+        var markers = line.gutterMarkers || (line.gutterMarkers = {});
+        markers[gutterID] = value;
+        if (!value && isEmpty(markers)) { line.gutterMarkers = null; }
+        return true
+      })
+    }),
+
+    clearGutter: docMethodOp(function(gutterID) {
+      var this$1 = this;
+
+      this.iter(function (line) {
+        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
+          changeLine(this$1, line, "gutter", function () {
+            line.gutterMarkers[gutterID] = null;
+            if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }
+            return true
+          });
+        }
+      });
+    }),
+
+    lineInfo: function(line) {
+      var n;
+      if (typeof line == "number") {
+        if (!isLine(this, line)) { return null }
+        n = line;
+        line = getLine(this, line);
+        if (!line) { return null }
+      } else {
+        n = lineNo(line);
+        if (n == null) { return null }
+      }
+      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
+              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
+              widgets: line.widgets}
+    },
+
+    addLineClass: docMethodOp(function(handle, where, cls) {
+      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
+        var prop = where == "text" ? "textClass"
+                 : where == "background" ? "bgClass"
+                 : where == "gutter" ? "gutterClass" : "wrapClass";
+        if (!line[prop]) { line[prop] = cls; }
+        else if (classTest(cls).test(line[prop])) { return false }
+        else { line[prop] += " " + cls; }
+        return true
+      })
+    }),
+    removeLineClass: docMethodOp(function(handle, where, cls) {
+      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
+        var prop = where == "text" ? "textClass"
+                 : where == "background" ? "bgClass"
+                 : where == "gutter" ? "gutterClass" : "wrapClass";
+        var cur = line[prop];
+        if (!cur) { return false }
+        else if (cls == null) { line[prop] = null; }
+        else {
+          var found = cur.match(classTest(cls));
+          if (!found) { return false }
+          var end = found.index + found[0].length;
+          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
+        }
+        return true
+      })
+    }),
+
+    addLineWidget: docMethodOp(function(handle, node, options) {
+      return addLineWidget(this, handle, node, options)
+    }),
+    removeLineWidget: function(widget) { widget.clear(); },
+
+    markText: function(from, to, options) {
+      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
+    },
+    setBookmark: function(pos, options) {
+      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
+                      insertLeft: options && options.insertLeft,
+                      clearWhenEmpty: false, shared: options && options.shared,
+                      handleMouseEvents: options && options.handleMouseEvents};
+      pos = clipPos(this, pos);
+      return markText(this, pos, pos, realOpts, "bookmark")
+    },
+    findMarksAt: function(pos) {
+      pos = clipPos(this, pos);
+      var markers = [], spans = getLine(this, pos.line).markedSpans;
+      if (spans) { for (var i = 0; i < spans.length; ++i) {
+        var span = spans[i];
+        if ((span.from == null || span.from <= pos.ch) &&
+            (span.to == null || span.to >= pos.ch))
+          { markers.push(span.marker.parent || span.marker); }
+      } }
+      return markers
+    },
+    findMarks: function(from, to, filter) {
+      from = clipPos(this, from); to = clipPos(this, to);
+      var found = [], lineNo = from.line;
+      this.iter(from.line, to.line + 1, function (line) {
+        var spans = line.markedSpans;
+        if (spans) { for (var i = 0; i < spans.length; i++) {
+          var span = spans[i];
+          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
+                span.from == null && lineNo != from.line ||
+                span.from != null && lineNo == to.line && span.from >= to.ch) &&
+              (!filter || filter(span.marker)))
+            { found.push(span.marker.parent || span.marker); }
+        } }
+        ++lineNo;
+      });
+      return found
+    },
+    getAllMarks: function() {
+      var markers = [];
+      this.iter(function (line) {
+        var sps = line.markedSpans;
+        if (sps) { for (var i = 0; i < sps.length; ++i)
+          { if (sps[i].from != null) { markers.push(sps[i].marker); } } }
+      });
+      return markers
+    },
+
+    posFromIndex: function(off) {
+      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
+      this.iter(function (line) {
+        var sz = line.text.length + sepSize;
+        if (sz > off) { ch = off; return true }
+        off -= sz;
+        ++lineNo;
+      });
+      return clipPos(this, Pos(lineNo, ch))
+    },
+    indexFromPos: function (coords) {
+      coords = clipPos(this, coords);
+      var index = coords.ch;
+      if (coords.line < this.first || coords.ch < 0) { return 0 }
+      var sepSize = this.lineSeparator().length;
+      this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
+        index += line.text.length + sepSize;
+      });
+      return index
+    },
+
+    copy: function(copyHistory) {
+      var doc = new Doc(getLines(this, this.first, this.first + this.size),
+                        this.modeOption, this.first, this.lineSep, this.direction);
+      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
+      doc.sel = this.sel;
+      doc.extend = false;
+      if (copyHistory) {
+        doc.history.undoDepth = this.history.undoDepth;
+        doc.setHistory(this.getHistory());
+      }
+      return doc
+    },
+
+    linkedDoc: function(options) {
+      if (!options) { options = {}; }
+      var from = this.first, to = this.first + this.size;
+      if (options.from != null && options.from > from) { from = options.from; }
+      if (options.to != null && options.to < to) { to = options.to; }
+      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
+      if (options.sharedHist) { copy.history = this.history
+      ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
+      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
+      copySharedMarkers(copy, findSharedMarkers(this));
+      return copy
+    },
+    unlinkDoc: function(other) {
+      if (other instanceof CodeMirror) { other = other.doc; }
+      if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
+        var link = this.linked[i];
+        if (link.doc != other) { continue }
+        this.linked.splice(i, 1);
+        other.unlinkDoc(this);
+        detachSharedMarkers(findSharedMarkers(this));
+        break
+      } }
+      // If the histories were shared, split them again
+      if (other.history == this.history) {
+        var splitIds = [other.id];
+        linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);
+        other.history = new History(null);
+        other.history.done = copyHistoryArray(this.history.done, splitIds);
+        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
+      }
+    },
+    iterLinkedDocs: function(f) {linkedDocs(this, f);},
+
+    getMode: function() {return this.mode},
+    getEditor: function() {return this.cm},
+
+    splitLines: function(str) {
+      if (this.lineSep) { return str.split(this.lineSep) }
+      return splitLinesAuto(str)
+    },
+    lineSeparator: function() { return this.lineSep || "\n" },
+
+    setDirection: docMethodOp(function (dir) {
+      if (dir != "rtl") { dir = "ltr"; }
+      if (dir == this.direction) { return }
+      this.direction = dir;
+      this.iter(function (line) { return line.order = null; });
+      if (this.cm) { directionChanged(this.cm); }
+    })
+  });
+
+  // Public alias.
+  Doc.prototype.eachLine = Doc.prototype.iter;
+
+  // Kludge to work around strange IE behavior where it'll sometimes
+  // re-fire a series of drag-related events right after the drop (#1551)
+  var lastDrop = 0;
+
+  function onDrop(e) {
+    var cm = this;
+    clearDragCursor(cm);
+    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
+      { return }
+    e_preventDefault(e);
+    if (ie) { lastDrop = +new Date; }
+    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
+    if (!pos || cm.isReadOnly()) { return }
+    // Might be a file drop, in which case we simply extract the text
+    // and insert it.
+    if (files && files.length && window.FileReader && window.File) {
+      var n = files.length, text = Array(n), read = 0;
+      var markAsReadAndPasteIfAllFilesAreRead = function () {
+        if (++read == n) {
+          operation(cm, function () {
+            pos = clipPos(cm.doc, pos);
+            var change = {from: pos, to: pos,
+                          text: cm.doc.splitLines(
+                              text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),
+                          origin: "paste"};
+            makeChange(cm.doc, change);
+            setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));
+          })();
+        }
+      };
+      var readTextFromFile = function (file, i) {
+        if (cm.options.allowDropFileTypes &&
+            indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
+          markAsReadAndPasteIfAllFilesAreRead();
+          return
+        }
+        var reader = new FileReader;
+        reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };
+        reader.onload = function () {
+          var content = reader.result;
+          if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
+            markAsReadAndPasteIfAllFilesAreRead();
+            return
+          }
+          text[i] = content;
+          markAsReadAndPasteIfAllFilesAreRead();
+        };
+        reader.readAsText(file);
+      };
+      for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }
+    } else { // Normal drop
+      // Don't do a replace if the drop happened inside of the selected text.
+      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
+        cm.state.draggingText(e);
+        // Ensure the editor is re-focused
+        setTimeout(function () { return cm.display.input.focus(); }, 20);
+        return
+      }
+      try {
+        var text$1 = e.dataTransfer.getData("Text");
+        if (text$1) {
+          var selected;
+          if (cm.state.draggingText && !cm.state.draggingText.copy)
+            { selected = cm.listSelections(); }
+          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
+          if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
+            { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag"); } }
+          cm.replaceSelection(text$1, "around", "paste");
+          cm.display.input.focus();
+        }
+      }
+      catch(e$1){}
+    }
+  }
+
+  function onDragStart(cm, e) {
+    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
+    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }
+
+    e.dataTransfer.setData("Text", cm.getSelection());
+    e.dataTransfer.effectAllowed = "copyMove";
+
+    // Use dummy image instead of default browsers image.
+    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
+    if (e.dataTransfer.setDragImage && !safari) {
+      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
+      img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
+      if (presto) {
+        img.width = img.height = 1;
+        cm.display.wrapper.appendChild(img);
+        // Force a relayout, or Opera won't use our image for some obscure reason
+        img._top = img.offsetTop;
+      }
+      e.dataTransfer.setDragImage(img, 0, 0);
+      if (presto) { img.parentNode.removeChild(img); }
+    }
+  }
+
+  function onDragOver(cm, e) {
+    var pos = posFromMouse(cm, e);
+    if (!pos) { return }
+    var frag = document.createDocumentFragment();
+    drawSelectionCursor(cm, pos, frag);
+    if (!cm.display.dragCursor) {
+      cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
+      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
+    }
+    removeChildrenAndAdd(cm.display.dragCursor, frag);
+  }
+
+  function clearDragCursor(cm) {
+    if (cm.display.dragCursor) {
+      cm.display.lineSpace.removeChild(cm.display.dragCursor);
+      cm.display.dragCursor = null;
+    }
+  }
+
+  // These must be handled carefully, because naively registering a
+  // handler for each editor will cause the editors to never be
+  // garbage collected.
+
+  function forEachCodeMirror(f) {
+    if (!document.getElementsByClassName) { return }
+    var byClass = document.getElementsByClassName("CodeMirror"), editors = [];
+    for (var i = 0; i < byClass.length; i++) {
+      var cm = byClass[i].CodeMirror;
+      if (cm) { editors.push(cm); }
+    }
+    if (editors.length) { editors[0].operation(function () {
+      for (var i = 0; i < editors.length; i++) { f(editors[i]); }
+    }); }
+  }
+
+  var globalsRegistered = false;
+  function ensureGlobalHandlers() {
+    if (globalsRegistered) { return }
+    registerGlobalHandlers();
+    globalsRegistered = true;
+  }
+  function registerGlobalHandlers() {
+    // When the window resizes, we need to refresh active editors.
+    var resizeTimer;
+    on(window, "resize", function () {
+      if (resizeTimer == null) { resizeTimer = setTimeout(function () {
+        resizeTimer = null;
+        forEachCodeMirror(onResize);
+      }, 100); }
+    });
+    // When the window loses focus, we want to show the editor as blurred
+    on(window, "blur", function () { return forEachCodeMirror(onBlur); });
+  }
+  // Called when the window resizes
+  function onResize(cm) {
+    var d = cm.display;
+    // Might be a text scaling operation, clear size caches.
+    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
+    d.scrollbarsClipped = false;
+    cm.setSize();
+  }
+
+  var keyNames = {
+    3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
+    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
+    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
+    46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
+    106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 145: "ScrollLock",
+    173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
+    221: "]", 222: "'", 224: "Mod", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
+    63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
+  };
+
+  // Number keys
+  for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }
+  // Alphabetic keys
+  for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }
+  // Function keys
+  for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2; }
+
+  var keyMap = {};
+
+  keyMap.basic = {
+    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
+    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
+    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
+    "Tab": "defaultTab", "Shift-Tab": "indentAuto",
+    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
+    "Esc": "singleSelection"
+  };
+  // Note that the save and find-related commands aren't defined by
+  // default. User code or addons can define them. Unknown commands
+  // are simply ignored.
+  keyMap.pcDefault = {
+    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
+    "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
+    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
+    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
+    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
+    "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
+    "fallthrough": "basic"
+  };
+  // Very basic readline/emacs-style bindings, which are standard on Mac.
+  keyMap.emacsy = {
+    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
+    "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd", "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp",
+    "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine",
+    "Ctrl-T": "transposeChars", "Ctrl-O": "openLine"
+  };
+  keyMap.macDefault = {
+    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
+    "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
+    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
+    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
+    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
+    "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
+    "fallthrough": ["basic", "emacsy"]
+  };
+  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
+
+  // KEYMAP DISPATCH
+
+  function normalizeKeyName(name) {
+    var parts = name.split(/-(?!$)/);
+    name = parts[parts.length - 1];
+    var alt, ctrl, shift, cmd;
+    for (var i = 0; i < parts.length - 1; i++) {
+      var mod = parts[i];
+      if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }
+      else if (/^a(lt)?$/i.test(mod)) { alt = true; }
+      else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }
+      else if (/^s(hift)?$/i.test(mod)) { shift = true; }
+      else { throw new Error("Unrecognized modifier name: " + mod) }
+    }
+    if (alt) { name = "Alt-" + name; }
+    if (ctrl) { name = "Ctrl-" + name; }
+    if (cmd) { name = "Cmd-" + name; }
+    if (shift) { name = "Shift-" + name; }
+    return name
+  }
+
+  // This is a kludge to keep keymaps mostly working as raw objects
+  // (backwards compatibility) while at the same time support features
+  // like normalization and multi-stroke key bindings. It compiles a
+  // new normalized keymap, and then updates the old object to reflect
+  // this.
+  function normalizeKeyMap(keymap) {
+    var copy = {};
+    for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
+      var value = keymap[keyname];
+      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
+      if (value == "...") { delete keymap[keyname]; continue }
+
+      var keys = map(keyname.split(" "), normalizeKeyName);
+      for (var i = 0; i < keys.length; i++) {
+        var val = (void 0), name = (void 0);
+        if (i == keys.length - 1) {
+          name = keys.join(" ");
+          val = value;
+        } else {
+          name = keys.slice(0, i + 1).join(" ");
+          val = "...";
+        }
+        var prev = copy[name];
+        if (!prev) { copy[name] = val; }
+        else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
+      }
+      delete keymap[keyname];
+    } }
+    for (var prop in copy) { keymap[prop] = copy[prop]; }
+    return keymap
+  }
+
+  function lookupKey(key, map, handle, context) {
+    map = getKeyMap(map);
+    var found = map.call ? map.call(key, context) : map[key];
+    if (found === false) { return "nothing" }
+    if (found === "...") { return "multi" }
+    if (found != null && handle(found)) { return "handled" }
+
+    if (map.fallthrough) {
+      if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
+        { return lookupKey(key, map.fallthrough, handle, context) }
+      for (var i = 0; i < map.fallthrough.length; i++) {
+        var result = lookupKey(key, map.fallthrough[i], handle, context);
+        if (result) { return result }
+      }
+    }
+  }
+
+  // Modifier key presses don't count as 'real' key presses for the
+  // purpose of keymap fallthrough.
+  function isModifierKey(value) {
+    var name = typeof value == "string" ? value : keyNames[value.keyCode];
+    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
+  }
+
+  function addModifierNames(name, event, noShift) {
+    var base = name;
+    if (event.altKey && base != "Alt") { name = "Alt-" + name; }
+    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name; }
+    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Mod") { name = "Cmd-" + name; }
+    if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name; }
+    return name
+  }
+
+  // Look up the name of a key as indicated by an event object.
+  function keyName(event, noShift) {
+    if (presto && event.keyCode == 34 && event["char"]) { return false }
+    var name = keyNames[event.keyCode];
+    if (name == null || event.altGraphKey) { return false }
+    // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
+    // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
+    if (event.keyCode == 3 && event.code) { name = event.code; }
+    return addModifierNames(name, event, noShift)
+  }
+
+  function getKeyMap(val) {
+    return typeof val == "string" ? keyMap[val] : val
+  }
+
+  // Helper for deleting text near the selection(s), used to implement
+  // backspace, delete, and similar functionality.
+  function deleteNearSelection(cm, compute) {
+    var ranges = cm.doc.sel.ranges, kill = [];
+    // Build up a set of ranges to kill first, merging overlapping
+    // ranges.
+    for (var i = 0; i < ranges.length; i++) {
+      var toKill = compute(ranges[i]);
+      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
+        var replaced = kill.pop();
+        if (cmp(replaced.from, toKill.from) < 0) {
+          toKill.from = replaced.from;
+          break
+        }
+      }
+      kill.push(toKill);
+    }
+    // Next, remove those actual ranges.
+    runInOp(cm, function () {
+      for (var i = kill.length - 1; i >= 0; i--)
+        { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
+      ensureCursorVisible(cm);
+    });
+  }
+
+  function moveCharLogically(line, ch, dir) {
+    var target = skipExtendingChars(line.text, ch + dir, dir);
+    return target < 0 || target > line.text.length ? null : target
+  }
+
+  function moveLogically(line, start, dir) {
+    var ch = moveCharLogically(line, start.ch, dir);
+    return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
+  }
+
+  function endOfLine(visually, cm, lineObj, lineNo, dir) {
+    if (visually) {
+      if (cm.doc.direction == "rtl") { dir = -dir; }
+      var order = getOrder(lineObj, cm.doc.direction);
+      if (order) {
+        var part = dir < 0 ? lst(order) : order[0];
+        var moveInStorageOrder = (dir < 0) == (part.level == 1);
+        var sticky = moveInStorageOrder ? "after" : "before";
+        var ch;
+        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
+        // it could be that the last bidi part is not on the last visual line,
+        // since visual lines contain content order-consecutive chunks.
+        // Thus, in rtl, we are looking for the first (content-order) character
+        // in the rtl chunk that is on the last line (that is, the same line
+        // as the last (content-order) character).
+        if (part.level > 0 || cm.doc.direction == "rtl") {
+          var prep = prepareMeasureForLine(cm, lineObj);
+          ch = dir < 0 ? lineObj.text.length - 1 : 0;
+          var targetTop = measureCharPrepared(cm, prep, ch).top;
+          ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
+          if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1); }
+        } else { ch = dir < 0 ? part.to : part.from; }
+        return new Pos(lineNo, ch, sticky)
+      }
+    }
+    return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
+  }
+
+  function moveVisually(cm, line, start, dir) {
+    var bidi = getOrder(line, cm.doc.direction);
+    if (!bidi) { return moveLogically(line, start, dir) }
+    if (start.ch >= line.text.length) {
+      start.ch = line.text.length;
+      start.sticky = "before";
+    } else if (start.ch <= 0) {
+      start.ch = 0;
+      start.sticky = "after";
+    }
+    var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
+    if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
+      // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
+      // nothing interesting happens.
+      return moveLogically(line, start, dir)
+    }
+
+    var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };
+    var prep;
+    var getWrappedLineExtent = function (ch) {
+      if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
+      prep = prep || prepareMeasureForLine(cm, line);
+      return wrappedLineExtentChar(cm, line, prep, ch)
+    };
+    var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);
+
+    if (cm.doc.direction == "rtl" || part.level == 1) {
+      var moveInStorageOrder = (part.level == 1) == (dir < 0);
+      var ch = mv(start, moveInStorageOrder ? 1 : -1);
+      if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
+        // Case 2: We move within an rtl part or in an rtl editor on the same visual line
+        var sticky = moveInStorageOrder ? "before" : "after";
+        return new Pos(start.line, ch, sticky)
+      }
+    }
+
+    // Case 3: Could not move within this bidi part in this visual line, so leave
+    // the current bidi part
+
+    var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
+      var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
+        ? new Pos(start.line, mv(ch, 1), "before")
+        : new Pos(start.line, ch, "after"); };
+
+      for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
+        var part = bidi[partPos];
+        var moveInStorageOrder = (dir > 0) == (part.level != 1);
+        var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
+        if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
+        ch = moveInStorageOrder ? part.from : mv(part.to, -1);
+        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
+      }
+    };
+
+    // Case 3a: Look for other bidi parts on the same visual line
+    var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
+    if (res) { return res }
+
+    // Case 3b: Look for other bidi parts on the next visual line
+    var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
+    if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
+      res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
+      if (res) { return res }
+    }
+
+    // Case 4: Nowhere to move
+    return null
+  }
+
+  // Commands are parameter-less actions that can be performed on an
+  // editor, mostly used for keybindings.
+  var commands = {
+    selectAll: selectAll,
+    singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
+    killLine: function (cm) { return deleteNearSelection(cm, function (range) {
+      if (range.empty()) {
+        var len = getLine(cm.doc, range.head.line).text.length;
+        if (range.head.ch == len && range.head.line < cm.lastLine())
+          { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
+        else
+          { return {from: range.head, to: Pos(range.head.line, len)} }
+      } else {
+        return {from: range.from(), to: range.to()}
+      }
+    }); },
+    deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
+      from: Pos(range.from().line, 0),
+      to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
+    }); }); },
+    delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
+      from: Pos(range.from().line, 0), to: range.from()
+    }); }); },
+    delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
+      var top = cm.charCoords(range.head, "div").top + 5;
+      var leftPos = cm.coordsChar({left: 0, top: top}, "div");
+      return {from: leftPos, to: range.from()}
+    }); },
+    delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
+      var top = cm.charCoords(range.head, "div").top + 5;
+      var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
+      return {from: range.from(), to: rightPos }
+    }); },
+    undo: function (cm) { return cm.undo(); },
+    redo: function (cm) { return cm.redo(); },
+    undoSelection: function (cm) { return cm.undoSelection(); },
+    redoSelection: function (cm) { return cm.redoSelection(); },
+    goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
+    goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
+    goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
+      {origin: "+move", bias: 1}
+    ); },
+    goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
+      {origin: "+move", bias: 1}
+    ); },
+    goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
+      {origin: "+move", bias: -1}
+    ); },
+    goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
+      var top = cm.cursorCoords(range.head, "div").top + 5;
+      return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
+    }, sel_move); },
+    goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
+      var top = cm.cursorCoords(range.head, "div").top + 5;
+      return cm.coordsChar({left: 0, top: top}, "div")
+    }, sel_move); },
+    goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
+      var top = cm.cursorCoords(range.head, "div").top + 5;
+      var pos = cm.coordsChar({left: 0, top: top}, "div");
+      if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
+      return pos
+    }, sel_move); },
+    goLineUp: function (cm) { return cm.moveV(-1, "line"); },
+    goLineDown: function (cm) { return cm.moveV(1, "line"); },
+    goPageUp: function (cm) { return cm.moveV(-1, "page"); },
+    goPageDown: function (cm) { return cm.moveV(1, "page"); },
+    goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
+    goCharRight: function (cm) { return cm.moveH(1, "char"); },
+    goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
+    goColumnRight: function (cm) { return cm.moveH(1, "column"); },
+    goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
+    goGroupRight: function (cm) { return cm.moveH(1, "group"); },
+    goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
+    goWordRight: function (cm) { return cm.moveH(1, "word"); },
+    delCharBefore: function (cm) { return cm.deleteH(-1, "codepoint"); },
+    delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
+    delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
+    delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
+    delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
+    delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
+    indentAuto: function (cm) { return cm.indentSelection("smart"); },
+    indentMore: function (cm) { return cm.indentSelection("add"); },
+    indentLess: function (cm) { return cm.indentSelection("subtract"); },
+    insertTab: function (cm) { return cm.replaceSelection("\t"); },
+    insertSoftTab: function (cm) {
+      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
+      for (var i = 0; i < ranges.length; i++) {
+        var pos = ranges[i].from();
+        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
+        spaces.push(spaceStr(tabSize - col % tabSize));
+      }
+      cm.replaceSelections(spaces);
+    },
+    defaultTab: function (cm) {
+      if (cm.somethingSelected()) { cm.indentSelection("add"); }
+      else { cm.execCommand("insertTab"); }
+    },
+    // Swap the two chars left and right of each selection's head.
+    // Move cursor behind the two swapped characters afterwards.
+    //
+    // Doesn't consider line feeds a character.
+    // Doesn't scan more than one line above to find a character.
+    // Doesn't do anything on an empty line.
+    // Doesn't do anything with non-empty selections.
+    transposeChars: function (cm) { return runInOp(cm, function () {
+      var ranges = cm.listSelections(), newSel = [];
+      for (var i = 0; i < ranges.length; i++) {
+        if (!ranges[i].empty()) { continue }
+        var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
+        if (line) {
+          if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }
+          if (cur.ch > 0) {
+            cur = new Pos(cur.line, cur.ch + 1);
+            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
+                            Pos(cur.line, cur.ch - 2), cur, "+transpose");
+          } else if (cur.line > cm.doc.first) {
+            var prev = getLine(cm.doc, cur.line - 1).text;
+            if (prev) {
+              cur = new Pos(cur.line, 1);
+              cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
+                              prev.charAt(prev.length - 1),
+                              Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
+            }
+          }
+        }
+        newSel.push(new Range(cur, cur));
+      }
+      cm.setSelections(newSel);
+    }); },
+    newlineAndIndent: function (cm) { return runInOp(cm, function () {
+      var sels = cm.listSelections();
+      for (var i = sels.length - 1; i >= 0; i--)
+        { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input"); }
+      sels = cm.listSelections();
+      for (var i$1 = 0; i$1 < sels.length; i$1++)
+        { cm.indentLine(sels[i$1].from().line, null, true); }
+      ensureCursorVisible(cm);
+    }); },
+    openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
+    toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
+  };
+
+
+  function lineStart(cm, lineN) {
+    var line = getLine(cm.doc, lineN);
+    var visual = visualLine(line);
+    if (visual != line) { lineN = lineNo(visual); }
+    return endOfLine(true, cm, visual, lineN, 1)
+  }
+  function lineEnd(cm, lineN) {
+    var line = getLine(cm.doc, lineN);
+    var visual = visualLineEnd(line);
+    if (visual != line) { lineN = lineNo(visual); }
+    return endOfLine(true, cm, line, lineN, -1)
+  }
+  function lineStartSmart(cm, pos) {
+    var start = lineStart(cm, pos.line);
+    var line = getLine(cm.doc, start.line);
+    var order = getOrder(line, cm.doc.direction);
+    if (!order || order[0].level == 0) {
+      var firstNonWS = Math.max(start.ch, line.text.search(/\S/));
+      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
+      return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
+    }
+    return start
+  }
+
+  // Run a handler that was bound to a key.
+  function doHandleBinding(cm, bound, dropShift) {
+    if (typeof bound == "string") {
+      bound = commands[bound];
+      if (!bound) { return false }
+    }
+    // Ensure previous input has been read, so that the handler sees a
+    // consistent view of the document
+    cm.display.input.ensurePolled();
+    var prevShift = cm.display.shift, done = false;
+    try {
+      if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
+      if (dropShift) { cm.display.shift = false; }
+      done = bound(cm) != Pass;
+    } finally {
+      cm.display.shift = prevShift;
+      cm.state.suppressEdits = false;
+    }
+    return done
+  }
+
+  function lookupKeyForEditor(cm, name, handle) {
+    for (var i = 0; i < cm.state.keyMaps.length; i++) {
+      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
+      if (result) { return result }
+    }
+    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
+      || lookupKey(name, cm.options.keyMap, handle, cm)
+  }
+
+  // Note that, despite the name, this function is also used to check
+  // for bound mouse clicks.
+
+  var stopSeq = new Delayed;
+
+  function dispatchKey(cm, name, e, handle) {
+    var seq = cm.state.keySeq;
+    if (seq) {
+      if (isModifierKey(name)) { return "handled" }
+      if (/\'$/.test(name))
+        { cm.state.keySeq = null; }
+      else
+        { stopSeq.set(50, function () {
+          if (cm.state.keySeq == seq) {
+            cm.state.keySeq = null;
+            cm.display.input.reset();
+          }
+        }); }
+      if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }
+    }
+    return dispatchKeyInner(cm, name, e, handle)
+  }
+
+  function dispatchKeyInner(cm, name, e, handle) {
+    var result = lookupKeyForEditor(cm, name, handle);
+
+    if (result == "multi")
+      { cm.state.keySeq = name; }
+    if (result == "handled")
+      { signalLater(cm, "keyHandled", cm, name, e); }
+
+    if (result == "handled" || result == "multi") {
+      e_preventDefault(e);
+      restartBlink(cm);
+    }
+
+    return !!result
+  }
+
+  // Handle a key from the keydown event.
+  function handleKeyBinding(cm, e) {
+    var name = keyName(e, true);
+    if (!name) { return false }
+
+    if (e.shiftKey && !cm.state.keySeq) {
+      // First try to resolve full name (including 'Shift-'). Failing
+      // that, see if there is a cursor-motion command (starting with
+      // 'go') bound to the keyname without 'Shift-'.
+      return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
+          || dispatchKey(cm, name, e, function (b) {
+               if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
+                 { return doHandleBinding(cm, b) }
+             })
+    } else {
+      return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
+    }
+  }
+
+  // Handle a key from the keypress event
+  function handleCharBinding(cm, e, ch) {
+    return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
+  }
+
+  var lastStoppedKey = null;
+  function onKeyDown(e) {
+    var cm = this;
+    if (e.target && e.target != cm.display.input.getField()) { return }
+    cm.curOp.focus = activeElt();
+    if (signalDOMEvent(cm, e)) { return }
+    // IE does strange things with escape.
+    if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }
+    var code = e.keyCode;
+    cm.display.shift = code == 16 || e.shiftKey;
+    var handled = handleKeyBinding(cm, e);
+    if (presto) {
+      lastStoppedKey = handled ? code : null;
+      // Opera has no cut event... we try to at least catch the key combo
+      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
+        { cm.replaceSelection("", null, "cut"); }
+    }
+    if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand)
+      { document.execCommand("cut"); }
+
+    // Turn mouse into crosshair when Alt is held on Mac.
+    if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
+      { showCrossHair(cm); }
+  }
+
+  function showCrossHair(cm) {
+    var lineDiv = cm.display.lineDiv;
+    addClass(lineDiv, "CodeMirror-crosshair");
+
+    function up(e) {
+      if (e.keyCode == 18 || !e.altKey) {
+        rmClass(lineDiv, "CodeMirror-crosshair");
+        off(document, "keyup", up);
+        off(document, "mouseover", up);
+      }
+    }
+    on(document, "keyup", up);
+    on(document, "mouseover", up);
+  }
+
+  function onKeyUp(e) {
+    if (e.keyCode == 16) { this.doc.sel.shift = false; }
+    signalDOMEvent(this, e);
+  }
+
+  function onKeyPress(e) {
+    var cm = this;
+    if (e.target && e.target != cm.display.input.getField()) { return }
+    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
+    var keyCode = e.keyCode, charCode = e.charCode;
+    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
+    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
+    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
+    // Some browsers fire keypress events for backspace
+    if (ch == "\x08") { return }
+    if (handleCharBinding(cm, e, ch)) { return }
+    cm.display.input.onKeyPress(e);
+  }
+
+  var DOUBLECLICK_DELAY = 400;
+
+  var PastClick = function(time, pos, button) {
+    this.time = time;
+    this.pos = pos;
+    this.button = button;
+  };
+
+  PastClick.prototype.compare = function (time, pos, button) {
+    return this.time + DOUBLECLICK_DELAY > time &&
+      cmp(pos, this.pos) == 0 && button == this.button
+  };
+
+  var lastClick, lastDoubleClick;
+  function clickRepeat(pos, button) {
+    var now = +new Date;
+    if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
+      lastClick = lastDoubleClick = null;
+      return "triple"
+    } else if (lastClick && lastClick.compare(now, pos, button)) {
+      lastDoubleClick = new PastClick(now, pos, button);
+      lastClick = null;
+      return "double"
+    } else {
+      lastClick = new PastClick(now, pos, button);
+      lastDoubleClick = null;
+      return "single"
+    }
+  }
+
+  // A mouse down can be a single click, double click, triple click,
+  // start of selection drag, start of text drag, new cursor
+  // (ctrl-click), rectangle drag (alt-drag), or xwin
+  // middle-click-paste. Or it might be a click on something we should
+  // not interfere with, such as a scrollbar or widget.
+  function onMouseDown(e) {
+    var cm = this, display = cm.display;
+    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
+    display.input.ensurePolled();
+    display.shift = e.shiftKey;
+
+    if (eventInWidget(display, e)) {
+      if (!webkit) {
+        // Briefly turn off draggability, to allow widgets to do
+        // normal dragging things.
+        display.scroller.draggable = false;
+        setTimeout(function () { return display.scroller.draggable = true; }, 100);
+      }
+      return
+    }
+    if (clickInGutter(cm, e)) { return }
+    var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
+    window.focus();
+
+    // #3261: make sure, that we're not starting a second selection
+    if (button == 1 && cm.state.selectingText)
+      { cm.state.selectingText(e); }
+
+    if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }
+
+    if (button == 1) {
+      if (pos) { leftButtonDown(cm, pos, repeat, e); }
+      else if (e_target(e) == display.scroller) { e_preventDefault(e); }
+    } else if (button == 2) {
+      if (pos) { extendSelection(cm.doc, pos); }
+      setTimeout(function () { return display.input.focus(); }, 20);
+    } else if (button == 3) {
+      if (captureRightClick) { cm.display.input.onContextMenu(e); }
+      else { delayBlurEvent(cm); }
+    }
+  }
+
+  function handleMappedButton(cm, button, pos, repeat, event) {
+    var name = "Click";
+    if (repeat == "double") { name = "Double" + name; }
+    else if (repeat == "triple") { name = "Triple" + name; }
+    name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;
+
+    return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {
+      if (typeof bound == "string") { bound = commands[bound]; }
+      if (!bound) { return false }
+      var done = false;
+      try {
+        if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
+        done = bound(cm, pos) != Pass;
+      } finally {
+        cm.state.suppressEdits = false;
+      }
+      return done
+    })
+  }
+
+  function configureMouse(cm, repeat, event) {
+    var option = cm.getOption("configureMouse");
+    var value = option ? option(cm, repeat, event) : {};
+    if (value.unit == null) {
+      var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
+      value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
+    }
+    if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }
+    if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }
+    if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }
+    return value
+  }
+
+  function leftButtonDown(cm, pos, repeat, event) {
+    if (ie) { setTimeout(bind(ensureFocus, cm), 0); }
+    else { cm.curOp.focus = activeElt(); }
+
+    var behavior = configureMouse(cm, repeat, event);
+
+    var sel = cm.doc.sel, contained;
+    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
+        repeat == "single" && (contained = sel.contains(pos)) > -1 &&
+        (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
+        (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
+      { leftButtonStartDrag(cm, event, pos, behavior); }
+    else
+      { leftButtonSelect(cm, event, pos, behavior); }
+  }
+
+  // Start a text drag. When it ends, see if any dragging actually
+  // happen, and treat as a click if it didn't.
+  function leftButtonStartDrag(cm, event, pos, behavior) {
+    var display = cm.display, moved = false;
+    var dragEnd = operation(cm, function (e) {
+      if (webkit) { display.scroller.draggable = false; }
+      cm.state.draggingText = false;
+      if (cm.state.delayingBlurEvent) {
+        if (cm.hasFocus()) { cm.state.delayingBlurEvent = false; }
+        else { delayBlurEvent(cm); }
+      }
+      off(display.wrapper.ownerDocument, "mouseup", dragEnd);
+      off(display.wrapper.ownerDocument, "mousemove", mouseMove);
+      off(display.scroller, "dragstart", dragStart);
+      off(display.scroller, "drop", dragEnd);
+      if (!moved) {
+        e_preventDefault(e);
+        if (!behavior.addNew)
+          { extendSelection(cm.doc, pos, null, null, behavior.extend); }
+        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
+        if ((webkit && !safari) || ie && ie_version == 9)
+          { setTimeout(function () {display.wrapper.ownerDocument.body.focus({preventScroll: true}); display.input.focus();}, 20); }
+        else
+          { display.input.focus(); }
+      }
+    });
+    var mouseMove = function(e2) {
+      moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
+    };
+    var dragStart = function () { return moved = true; };
+    // Let the drag handler handle this.
+    if (webkit) { display.scroller.draggable = true; }
+    cm.state.draggingText = dragEnd;
+    dragEnd.copy = !behavior.moveOnDrag;
+    on(display.wrapper.ownerDocument, "mouseup", dragEnd);
+    on(display.wrapper.ownerDocument, "mousemove", mouseMove);
+    on(display.scroller, "dragstart", dragStart);
+    on(display.scroller, "drop", dragEnd);
+
+    cm.state.delayingBlurEvent = true;
+    setTimeout(function () { return display.input.focus(); }, 20);
+    // IE's approach to draggable
+    if (display.scroller.dragDrop) { display.scroller.dragDrop(); }
+  }
+
+  function rangeForUnit(cm, pos, unit) {
+    if (unit == "char") { return new Range(pos, pos) }
+    if (unit == "word") { return cm.findWordAt(pos) }
+    if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
+    var result = unit(cm, pos);
+    return new Range(result.from, result.to)
+  }
+
+  // Normal selection, as opposed to text dragging.
+  function leftButtonSelect(cm, event, start, behavior) {
+    if (ie) { delayBlurEvent(cm); }
+    var display = cm.display, doc = cm.doc;
+    e_preventDefault(event);
+
+    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
+    if (behavior.addNew && !behavior.extend) {
+      ourIndex = doc.sel.contains(start);
+      if (ourIndex > -1)
+        { ourRange = ranges[ourIndex]; }
+      else
+        { ourRange = new Range(start, start); }
+    } else {
+      ourRange = doc.sel.primary();
+      ourIndex = doc.sel.primIndex;
+    }
+
+    if (behavior.unit == "rectangle") {
+      if (!behavior.addNew) { ourRange = new Range(start, start); }
+      start = posFromMouse(cm, event, true, true);
+      ourIndex = -1;
+    } else {
+      var range = rangeForUnit(cm, start, behavior.unit);
+      if (behavior.extend)
+        { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }
+      else
+        { ourRange = range; }
+    }
+
+    if (!behavior.addNew) {
+      ourIndex = 0;
+      setSelection(doc, new Selection([ourRange], 0), sel_mouse);
+      startSel = doc.sel;
+    } else if (ourIndex == -1) {
+      ourIndex = ranges.length;
+      setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
+                   {scroll: false, origin: "*mouse"});
+    } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
+      setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
+                   {scroll: false, origin: "*mouse"});
+      startSel = doc.sel;
+    } else {
+      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
+    }
+
+    var lastPos = start;
+    function extendTo(pos) {
+      if (cmp(lastPos, pos) == 0) { return }
+      lastPos = pos;
+
+      if (behavior.unit == "rectangle") {
+        var ranges = [], tabSize = cm.options.tabSize;
+        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
+        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
+        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
+        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
+             line <= end; line++) {
+          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
+          if (left == right)
+            { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }
+          else if (text.length > leftPos)
+            { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }
+        }
+        if (!ranges.length) { ranges.push(new Range(start, start)); }
+        setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
+                     {origin: "*mouse", scroll: false});
+        cm.scrollIntoView(pos);
+      } else {
+        var oldRange = ourRange;
+        var range = rangeForUnit(cm, pos, behavior.unit);
+        var anchor = oldRange.anchor, head;
+        if (cmp(range.anchor, anchor) > 0) {
+          head = range.head;
+          anchor = minPos(oldRange.from(), range.anchor);
+        } else {
+          head = range.anchor;
+          anchor = maxPos(oldRange.to(), range.head);
+        }
+        var ranges$1 = startSel.ranges.slice(0);
+        ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
+        setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);
+      }
+    }
+
+    var editorSize = display.wrapper.getBoundingClientRect();
+    // Used to ensure timeout re-tries don't fire when another extend
+    // happened in the meantime (clearTimeout isn't reliable -- at
+    // least on Chrome, the timeouts still happen even when cleared,
+    // if the clear happens after their scheduled firing time).
+    var counter = 0;
+
+    function extend(e) {
+      var curCount = ++counter;
+      var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
+      if (!cur) { return }
+      if (cmp(cur, lastPos) != 0) {
+        cm.curOp.focus = activeElt();
+        extendTo(cur);
+        var visible = visibleLines(display, doc);
+        if (cur.line >= visible.to || cur.line < visible.from)
+          { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }
+      } else {
+        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
+        if (outside) { setTimeout(operation(cm, function () {
+          if (counter != curCount) { return }
+          display.scroller.scrollTop += outside;
+          extend(e);
+        }), 50); }
+      }
+    }
+
+    function done(e) {
+      cm.state.selectingText = false;
+      counter = Infinity;
+      // If e is null or undefined we interpret this as someone trying
+      // to explicitly cancel the selection rather than the user
+      // letting go of the mouse button.
+      if (e) {
+        e_preventDefault(e);
+        display.input.focus();
+      }
+      off(display.wrapper.ownerDocument, "mousemove", move);
+      off(display.wrapper.ownerDocument, "mouseup", up);
+      doc.history.lastSelOrigin = null;
+    }
+
+    var move = operation(cm, function (e) {
+      if (e.buttons === 0 || !e_button(e)) { done(e); }
+      else { extend(e); }
+    });
+    var up = operation(cm, done);
+    cm.state.selectingText = up;
+    on(display.wrapper.ownerDocument, "mousemove", move);
+    on(display.wrapper.ownerDocument, "mouseup", up);
+  }
+
+  // Used when mouse-selecting to adjust the anchor to the proper side
+  // of a bidi jump depending on the visual position of the head.
+  function bidiSimplify(cm, range) {
+    var anchor = range.anchor;
+    var head = range.head;
+    var anchorLine = getLine(cm.doc, anchor.line);
+    if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }
+    var order = getOrder(anchorLine);
+    if (!order) { return range }
+    var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];
+    if (part.from != anchor.ch && part.to != anchor.ch) { return range }
+    var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
+    if (boundary == 0 || boundary == order.length) { return range }
+
+    // Compute the relative visual position of the head compared to the
+    // anchor (<0 is to the left, >0 to the right)
+    var leftSide;
+    if (head.line != anchor.line) {
+      leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
+    } else {
+      var headIndex = getBidiPartAt(order, head.ch, head.sticky);
+      var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
+      if (headIndex == boundary - 1 || headIndex == boundary)
+        { leftSide = dir < 0; }
+      else
+        { leftSide = dir > 0; }
+    }
+
+    var usePart = order[boundary + (leftSide ? -1 : 0)];
+    var from = leftSide == (usePart.level == 1);
+    var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before";
+    return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)
+  }
+
+
+  // Determines whether an event happened in the gutter, and fires the
+  // handlers for the corresponding event.
+  function gutterEvent(cm, e, type, prevent) {
+    var mX, mY;
+    if (e.touches) {
+      mX = e.touches[0].clientX;
+      mY = e.touches[0].clientY;
+    } else {
+      try { mX = e.clientX; mY = e.clientY; }
+      catch(e$1) { return false }
+    }
+    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
+    if (prevent) { e_preventDefault(e); }
+
+    var display = cm.display;
+    var lineBox = display.lineDiv.getBoundingClientRect();
+
+    if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
+    mY -= lineBox.top - display.viewOffset;
+
+    for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {
+      var g = display.gutters.childNodes[i];
+      if (g && g.getBoundingClientRect().right >= mX) {
+        var line = lineAtHeight(cm.doc, mY);
+        var gutter = cm.display.gutterSpecs[i];
+        signal(cm, type, cm, line, gutter.className, e);
+        return e_defaultPrevented(e)
+      }
+    }
+  }
+
+  function clickInGutter(cm, e) {
+    return gutterEvent(cm, e, "gutterClick", true)
+  }
+
+  // CONTEXT MENU HANDLING
+
+  // To make the context menu work, we need to briefly unhide the
+  // textarea (making it as unobtrusive as possible) to let the
+  // right-click take effect on it.
+  function onContextMenu(cm, e) {
+    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
+    if (signalDOMEvent(cm, e, "contextmenu")) { return }
+    if (!captureRightClick) { cm.display.input.onContextMenu(e); }
+  }
+
+  function contextMenuInGutter(cm, e) {
+    if (!hasHandler(cm, "gutterContextMenu")) { return false }
+    return gutterEvent(cm, e, "gutterContextMenu", false)
+  }
+
+  function themeChanged(cm) {
+    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
+      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
+    clearCaches(cm);
+  }
+
+  var Init = {toString: function(){return "CodeMirror.Init"}};
+
+  var defaults = {};
+  var optionHandlers = {};
+
+  function defineOptions(CodeMirror) {
+    var optionHandlers = CodeMirror.optionHandlers;
+
+    function option(name, deflt, handle, notOnInit) {
+      CodeMirror.defaults[name] = deflt;
+      if (handle) { optionHandlers[name] =
+        notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }
+    }
+
+    CodeMirror.defineOption = option;
+
+    // Passed to option handlers when there is no old value.
+    CodeMirror.Init = Init;
+
+    // These two are, on init, called from the constructor because they
+    // have to be initialized before the editor can start at all.
+    option("value", "", function (cm, val) { return cm.setValue(val); }, true);
+    option("mode", null, function (cm, val) {
+      cm.doc.modeOption = val;
+      loadMode(cm);
+    }, true);
+
+    option("indentUnit", 2, loadMode, true);
+    option("indentWithTabs", false);
+    option("smartIndent", true);
+    option("tabSize", 4, function (cm) {
+      resetModeState(cm);
+      clearCaches(cm);
+      regChange(cm);
+    }, true);
+
+    option("lineSeparator", null, function (cm, val) {
+      cm.doc.lineSep = val;
+      if (!val) { return }
+      var newBreaks = [], lineNo = cm.doc.first;
+      cm.doc.iter(function (line) {
+        for (var pos = 0;;) {
+          var found = line.text.indexOf(val, pos);
+          if (found == -1) { break }
+          pos = found + val.length;
+          newBreaks.push(Pos(lineNo, found));
+        }
+        lineNo++;
+      });
+      for (var i = newBreaks.length - 1; i >= 0; i--)
+        { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }
+    });
+    option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b\u200e\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g, function (cm, val, old) {
+      cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
+      if (old != Init) { cm.refresh(); }
+    });
+    option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);
+    option("electricChars", true);
+    option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
+      throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
+    }, true);
+    option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);
+    option("autocorrect", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);
+    option("autocapitalize", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);
+    option("rtlMoveVisually", !windows);
+    option("wholeLineUpdateBefore", true);
+
+    option("theme", "default", function (cm) {
+      themeChanged(cm);
+      updateGutters(cm);
+    }, true);
+    option("keyMap", "default", function (cm, val, old) {
+      var next = getKeyMap(val);
+      var prev = old != Init && getKeyMap(old);
+      if (prev && prev.detach) { prev.detach(cm, next); }
+      if (next.attach) { next.attach(cm, prev || null); }
+    });
+    option("extraKeys", null);
+    option("configureMouse", null);
+
+    option("lineWrapping", false, wrappingChanged, true);
+    option("gutters", [], function (cm, val) {
+      cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);
+      updateGutters(cm);
+    }, true);
+    option("fixedGutter", true, function (cm, val) {
+      cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
+      cm.refresh();
+    }, true);
+    option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true);
+    option("scrollbarStyle", "native", function (cm) {
+      initScrollbars(cm);
+      updateScrollbars(cm);
+      cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
+      cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
+    }, true);
+    option("lineNumbers", false, function (cm, val) {
+      cm.display.gutterSpecs = getGutters(cm.options.gutters, val);
+      updateGutters(cm);
+    }, true);
+    option("firstLineNumber", 1, updateGutters, true);
+    option("lineNumberFormatter", function (integer) { return integer; }, updateGutters, true);
+    option("showCursorWhenSelecting", false, updateSelection, true);
+
+    option("resetSelectionOnContextMenu", true);
+    option("lineWiseCopyCut", true);
+    option("pasteLinesPerSelection", true);
+    option("selectionsMayTouch", false);
+
+    option("readOnly", false, function (cm, val) {
+      if (val == "nocursor") {
+        onBlur(cm);
+        cm.display.input.blur();
+      }
+      cm.display.input.readOnlyChanged(val);
+    });
+
+    option("screenReaderLabel", null, function (cm, val) {
+      val = (val === '') ? null : val;
+      cm.display.input.screenReaderLabelChanged(val);
+    });
+
+    option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);
+    option("dragDrop", true, dragDropChanged);
+    option("allowDropFileTypes", null);
+
+    option("cursorBlinkRate", 530);
+    option("cursorScrollMargin", 0);
+    option("cursorHeight", 1, updateSelection, true);
+    option("singleCursorHeightPerLine", true, updateSelection, true);
+    option("workTime", 100);
+    option("workDelay", 100);
+    option("flattenSpans", true, resetModeState, true);
+    option("addModeClass", false, resetModeState, true);
+    option("pollInterval", 100);
+    option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });
+    option("historyEventDelay", 1250);
+    option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true);
+    option("maxHighlightLength", 10000, resetModeState, true);
+    option("moveInputWithCursor", true, function (cm, val) {
+      if (!val) { cm.display.input.resetPosition(); }
+    });
+
+    option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; });
+    option("autofocus", null);
+    option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true);
+    option("phrases", null);
+  }
+
+  function dragDropChanged(cm, value, old) {
+    var wasOn = old && old != Init;
+    if (!value != !wasOn) {
+      var funcs = cm.display.dragFunctions;
+      var toggle = value ? on : off;
+      toggle(cm.display.scroller, "dragstart", funcs.start);
+      toggle(cm.display.scroller, "dragenter", funcs.enter);
+      toggle(cm.display.scroller, "dragover", funcs.over);
+      toggle(cm.display.scroller, "dragleave", funcs.leave);
+      toggle(cm.display.scroller, "drop", funcs.drop);
+    }
+  }
+
+  function wrappingChanged(cm) {
+    if (cm.options.lineWrapping) {
+      addClass(cm.display.wrapper, "CodeMirror-wrap");
+      cm.display.sizer.style.minWidth = "";
+      cm.display.sizerWidth = null;
+    } else {
+      rmClass(cm.display.wrapper, "CodeMirror-wrap");
+      findMaxLine(cm);
+    }
+    estimateLineHeights(cm);
+    regChange(cm);
+    clearCaches(cm);
+    setTimeout(function () { return updateScrollbars(cm); }, 100);
+  }
+
+  // A CodeMirror instance represents an editor. This is the object
+  // that user code is usually dealing with.
+
+  function CodeMirror(place, options) {
+    var this$1 = this;
+
+    if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }
+
+    this.options = options = options ? copyObj(options) : {};
+    // Determine effective options based on given values and defaults.
+    copyObj(defaults, options, false);
+
+    var doc = options.value;
+    if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }
+    else if (options.mode) { doc.modeOption = options.mode; }
+    this.doc = doc;
+
+    var input = new CodeMirror.inputStyles[options.inputStyle](this);
+    var display = this.display = new Display(place, doc, input, options);
+    display.wrapper.CodeMirror = this;
+    themeChanged(this);
+    if (options.lineWrapping)
+      { this.display.wrapper.className += " CodeMirror-wrap"; }
+    initScrollbars(this);
+
+    this.state = {
+      keyMaps: [],  // stores maps added by addKeyMap
+      overlays: [], // highlighting overlays, as added by addOverlay
+      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
+      overwrite: false,
+      delayingBlurEvent: false,
+      focused: false,
+      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
+      pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll
+      selectingText: false,
+      draggingText: false,
+      highlight: new Delayed(), // stores highlight worker timeout
+      keySeq: null,  // Unfinished key sequence
+      specialChars: null
+    };
+
+    if (options.autofocus && !mobile) { display.input.focus(); }
+
+    // Override magic textarea content restore that IE sometimes does
+    // on our hidden textarea on reload
+    if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }
+
+    registerEventHandlers(this);
+    ensureGlobalHandlers();
+
+    startOperation(this);
+    this.curOp.forceUpdate = true;
+    attachDoc(this, doc);
+
+    if ((options.autofocus && !mobile) || this.hasFocus())
+      { setTimeout(function () {
+        if (this$1.hasFocus() && !this$1.state.focused) { onFocus(this$1); }
+      }, 20); }
+    else
+      { onBlur(this); }
+
+    for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
+      { optionHandlers[opt](this, options[opt], Init); } }
+    maybeUpdateLineNumberWidth(this);
+    if (options.finishInit) { options.finishInit(this); }
+    for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }
+    endOperation(this);
+    // Suppress optimizelegibility in Webkit, since it breaks text
+    // measuring on line wrapping boundaries.
+    if (webkit && options.lineWrapping &&
+        getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
+      { display.lineDiv.style.textRendering = "auto"; }
+  }
+
+  // The default configuration options.
+  CodeMirror.defaults = defaults;
+  // Functions to run when options are changed.
+  CodeMirror.optionHandlers = optionHandlers;
+
+  // Attach the necessary event handlers when initializing the editor
+  function registerEventHandlers(cm) {
+    var d = cm.display;
+    on(d.scroller, "mousedown", operation(cm, onMouseDown));
+    // Older IE's will not fire a second mousedown for a double click
+    if (ie && ie_version < 11)
+      { on(d.scroller, "dblclick", operation(cm, function (e) {
+        if (signalDOMEvent(cm, e)) { return }
+        var pos = posFromMouse(cm, e);
+        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
+        e_preventDefault(e);
+        var word = cm.findWordAt(pos);
+        extendSelection(cm.doc, word.anchor, word.head);
+      })); }
+    else
+      { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }
+    // Some browsers fire contextmenu *after* opening the menu, at
+    // which point we can't mess with it anymore. Context menu is
+    // handled in onMouseDown for these browsers.
+    on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); });
+    on(d.input.getField(), "contextmenu", function (e) {
+      if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }
+    });
+
+    // Used to suppress mouse event handling when a touch happens
+    var touchFinished, prevTouch = {end: 0};
+    function finishTouch() {
+      if (d.activeTouch) {
+        touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);
+        prevTouch = d.activeTouch;
+        prevTouch.end = +new Date;
+      }
+    }
+    function isMouseLikeTouchEvent(e) {
+      if (e.touches.length != 1) { return false }
+      var touch = e.touches[0];
+      return touch.radiusX <= 1 && touch.radiusY <= 1
+    }
+    function farAway(touch, other) {
+      if (other.left == null) { return true }
+      var dx = other.left - touch.left, dy = other.top - touch.top;
+      return dx * dx + dy * dy > 20 * 20
+    }
+    on(d.scroller, "touchstart", function (e) {
+      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
+        d.input.ensurePolled();
+        clearTimeout(touchFinished);
+        var now = +new Date;
+        d.activeTouch = {start: now, moved: false,
+                         prev: now - prevTouch.end <= 300 ? prevTouch : null};
+        if (e.touches.length == 1) {
+          d.activeTouch.left = e.touches[0].pageX;
+          d.activeTouch.top = e.touches[0].pageY;
+        }
+      }
+    });
+    on(d.scroller, "touchmove", function () {
+      if (d.activeTouch) { d.activeTouch.moved = true; }
+    });
+    on(d.scroller, "touchend", function (e) {
+      var touch = d.activeTouch;
+      if (touch && !eventInWidget(d, e) && touch.left != null &&
+          !touch.moved && new Date - touch.start < 300) {
+        var pos = cm.coordsChar(d.activeTouch, "page"), range;
+        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
+          { range = new Range(pos, pos); }
+        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
+          { range = cm.findWordAt(pos); }
+        else // Triple tap
+          { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }
+        cm.setSelection(range.anchor, range.head);
+        cm.focus();
+        e_preventDefault(e);
+      }
+      finishTouch();
+    });
+    on(d.scroller, "touchcancel", finishTouch);
+
+    // Sync scrolling between fake scrollbars and real scrollable
+    // area, ensure viewport is updated when scrolling.
+    on(d.scroller, "scroll", function () {
+      if (d.scroller.clientHeight) {
+        updateScrollTop(cm, d.scroller.scrollTop);
+        setScrollLeft(cm, d.scroller.scrollLeft, true);
+        signal(cm, "scroll", cm);
+      }
+    });
+
+    // Listen to wheel events in order to try and update the viewport on time.
+    on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); });
+    on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); });
+
+    // Prevent wrapper from ever scrolling
+    on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
+
+    d.dragFunctions = {
+      enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},
+      over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
+      start: function (e) { return onDragStart(cm, e); },
+      drop: operation(cm, onDrop),
+      leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
+    };
+
+    var inp = d.input.getField();
+    on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); });
+    on(inp, "keydown", operation(cm, onKeyDown));
+    on(inp, "keypress", operation(cm, onKeyPress));
+    on(inp, "focus", function (e) { return onFocus(cm, e); });
+    on(inp, "blur", function (e) { return onBlur(cm, e); });
+  }
+
+  var initHooks = [];
+  CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };
+
+  // Indent the given line. The how parameter can be "smart",
+  // "add"/null, "subtract", or "prev". When aggressive is false
+  // (typically set to true for forced single-line indents), empty
+  // lines are not indented, and places where the mode returns Pass
+  // are left alone.
+  function indentLine(cm, n, how, aggressive) {
+    var doc = cm.doc, state;
+    if (how == null) { how = "add"; }
+    if (how == "smart") {
+      // Fall back to "prev" when the mode doesn't have an indentation
+      // method.
+      if (!doc.mode.indent) { how = "prev"; }
+      else { state = getContextBefore(cm, n).state; }
+    }
+
+    var tabSize = cm.options.tabSize;
+    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
+    if (line.stateAfter) { line.stateAfter = null; }
+    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
+    if (!aggressive && !/\S/.test(line.text)) {
+      indentation = 0;
+      how = "not";
+    } else if (how == "smart") {
+      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
+      if (indentation == Pass || indentation > 150) {
+        if (!aggressive) { return }
+        how = "prev";
+      }
+    }
+    if (how == "prev") {
+      if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }
+      else { indentation = 0; }
+    } else if (how == "add") {
+      indentation = curSpace + cm.options.indentUnit;
+    } else if (how == "subtract") {
+      indentation = curSpace - cm.options.indentUnit;
+    } else if (typeof how == "number") {
+      indentation = curSpace + how;
+    }
+    indentation = Math.max(0, indentation);
+
+    var indentString = "", pos = 0;
+    if (cm.options.indentWithTabs)
+      { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";} }
+    if (pos < indentation) { indentString += spaceStr(indentation - pos); }
+
+    if (indentString != curSpaceString) {
+      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
+      line.stateAfter = null;
+      return true
+    } else {
+      // Ensure that, if the cursor was in the whitespace at the start
+      // of the line, it is moved to the end of that space.
+      for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
+        var range = doc.sel.ranges[i$1];
+        if (range.head.line == n && range.head.ch < curSpaceString.length) {
+          var pos$1 = Pos(n, curSpaceString.length);
+          replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
+          break
+        }
+      }
+    }
+  }
+
+  // This will be set to a {lineWise: bool, text: [string]} object, so
+  // that, when pasting, we know what kind of selections the copied
+  // text was made out of.
+  var lastCopied = null;
+
+  function setLastCopied(newLastCopied) {
+    lastCopied = newLastCopied;
+  }
+
+  function applyTextInput(cm, inserted, deleted, sel, origin) {
+    var doc = cm.doc;
+    cm.display.shift = false;
+    if (!sel) { sel = doc.sel; }
+
+    var recent = +new Date - 200;
+    var paste = origin == "paste" || cm.state.pasteIncoming > recent;
+    var textLines = splitLinesAuto(inserted), multiPaste = null;
+    // When pasting N lines into N selections, insert one line per selection
+    if (paste && sel.ranges.length > 1) {
+      if (lastCopied && lastCopied.text.join("\n") == inserted) {
+        if (sel.ranges.length % lastCopied.text.length == 0) {
+          multiPaste = [];
+          for (var i = 0; i < lastCopied.text.length; i++)
+            { multiPaste.push(doc.splitLines(lastCopied.text[i])); }
+        }
+      } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
+        multiPaste = map(textLines, function (l) { return [l]; });
+      }
+    }
+
+    var updateInput = cm.curOp.updateInput;
+    // Normal behavior is to insert the new text into every selection
+    for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
+      var range = sel.ranges[i$1];
+      var from = range.from(), to = range.to();
+      if (range.empty()) {
+        if (deleted && deleted > 0) // Handle deletion
+          { from = Pos(from.line, from.ch - deleted); }
+        else if (cm.state.overwrite && !paste) // Handle overwrite
+          { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }
+        else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == textLines.join("\n"))
+          { from = to = Pos(from.line, 0); }
+      }
+      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
+                         origin: origin || (paste ? "paste" : cm.state.cutIncoming > recent ? "cut" : "+input")};
+      makeChange(cm.doc, changeEvent);
+      signalLater(cm, "inputRead", cm, changeEvent);
+    }
+    if (inserted && !paste)
+      { triggerElectric(cm, inserted); }
+
+    ensureCursorVisible(cm);
+    if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }
+    cm.curOp.typing = true;
+    cm.state.pasteIncoming = cm.state.cutIncoming = -1;
+  }
+
+  function handlePaste(e, cm) {
+    var pasted = e.clipboardData && e.clipboardData.getData("Text");
+    if (pasted) {
+      e.preventDefault();
+      if (!cm.isReadOnly() && !cm.options.disableInput)
+        { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }); }
+      return true
+    }
+  }
+
+  function triggerElectric(cm, inserted) {
+    // When an 'electric' character is inserted, immediately trigger a reindent
+    if (!cm.options.electricChars || !cm.options.smartIndent) { return }
+    var sel = cm.doc.sel;
+
+    for (var i = sel.ranges.length - 1; i >= 0; i--) {
+      var range = sel.ranges[i];
+      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
+      var mode = cm.getModeAt(range.head);
+      var indented = false;
+      if (mode.electricChars) {
+        for (var j = 0; j < mode.electricChars.length; j++)
+          { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
+            indented = indentLine(cm, range.head.line, "smart");
+            break
+          } }
+      } else if (mode.electricInput) {
+        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
+          { indented = indentLine(cm, range.head.line, "smart"); }
+      }
+      if (indented) { signalLater(cm, "electricInput", cm, range.head.line); }
+    }
+  }
+
+  function copyableRanges(cm) {
+    var text = [], ranges = [];
+    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
+      var line = cm.doc.sel.ranges[i].head.line;
+      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
+      ranges.push(lineRange);
+      text.push(cm.getRange(lineRange.anchor, lineRange.head));
+    }
+    return {text: text, ranges: ranges}
+  }
+
+  function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {
+    field.setAttribute("autocorrect", autocorrect ? "" : "off");
+    field.setAttribute("autocapitalize", autocapitalize ? "" : "off");
+    field.setAttribute("spellcheck", !!spellcheck);
+  }
+
+  function hiddenTextarea() {
+    var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; min-height: 1em; outline: none");
+    var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The textarea is kept positioned near the cursor to prevent the
+    // fact that it'll be scrolled into view on input from scrolling
+    // our fake cursor out of view. On webkit, when wrap=off, paste is
+    // very slow. So make the area wide instead.
+    if (webkit) { te.style.width = "1000px"; }
+    else { te.setAttribute("wrap", "off"); }
+    // If border: 0; -- iOS fails to open keyboard (issue #1287)
+    if (ios) { te.style.border = "1px solid black"; }
+    disableBrowserMagic(te);
+    return div
+  }
+
+  // The publicly visible API. Note that methodOp(f) means
+  // 'wrap f in an operation, performed on its `this` parameter'.
+
+  // This is not the complete set of editor methods. Most of the
+  // methods defined on the Doc type are also injected into
+  // CodeMirror.prototype, for backwards compatibility and
+  // convenience.
+
+  function addEditorMethods(CodeMirror) {
+    var optionHandlers = CodeMirror.optionHandlers;
+
+    var helpers = CodeMirror.helpers = {};
+
+    CodeMirror.prototype = {
+      constructor: CodeMirror,
+      focus: function(){window.focus(); this.display.input.focus();},
+
+      setOption: function(option, value) {
+        var options = this.options, old = options[option];
+        if (options[option] == value && option != "mode") { return }
+        options[option] = value;
+        if (optionHandlers.hasOwnProperty(option))
+          { operation(this, optionHandlers[option])(this, value, old); }
+        signal(this, "optionChange", this, option);
+      },
+
+      getOption: function(option) {return this.options[option]},
+      getDoc: function() {return this.doc},
+
+      addKeyMap: function(map, bottom) {
+        this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
+      },
+      removeKeyMap: function(map) {
+        var maps = this.state.keyMaps;
+        for (var i = 0; i < maps.length; ++i)
+          { if (maps[i] == map || maps[i].name == map) {
+            maps.splice(i, 1);
+            return true
+          } }
+      },
+
+      addOverlay: methodOp(function(spec, options) {
+        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
+        if (mode.startState) { throw new Error("Overlays may not be stateful.") }
+        insertSorted(this.state.overlays,
+                     {mode: mode, modeSpec: spec, opaque: options && options.opaque,
+                      priority: (options && options.priority) || 0},
+                     function (overlay) { return overlay.priority; });
+        this.state.modeGen++;
+        regChange(this);
+      }),
+      removeOverlay: methodOp(function(spec) {
+        var overlays = this.state.overlays;
+        for (var i = 0; i < overlays.length; ++i) {
+          var cur = overlays[i].modeSpec;
+          if (cur == spec || typeof spec == "string" && cur.name == spec) {
+            overlays.splice(i, 1);
+            this.state.modeGen++;
+            regChange(this);
+            return
+          }
+        }
+      }),
+
+      indentLine: methodOp(function(n, dir, aggressive) {
+        if (typeof dir != "string" && typeof dir != "number") {
+          if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev"; }
+          else { dir = dir ? "add" : "subtract"; }
+        }
+        if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }
+      }),
+      indentSelection: methodOp(function(how) {
+        var ranges = this.doc.sel.ranges, end = -1;
+        for (var i = 0; i < ranges.length; i++) {
+          var range = ranges[i];
+          if (!range.empty()) {
+            var from = range.from(), to = range.to();
+            var start = Math.max(end, from.line);
+            end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
+            for (var j = start; j < end; ++j)
+              { indentLine(this, j, how); }
+            var newRanges = this.doc.sel.ranges;
+            if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
+              { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }
+          } else if (range.head.line > end) {
+            indentLine(this, range.head.line, how, true);
+            end = range.head.line;
+            if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }
+          }
+        }
+      }),
+
+      // Fetch the parser token for a given character. Useful for hacks
+      // that want to inspect the mode state (say, for completion).
+      getTokenAt: function(pos, precise) {
+        return takeToken(this, pos, precise)
+      },
+
+      getLineTokens: function(line, precise) {
+        return takeToken(this, Pos(line), precise, true)
+      },
+
+      getTokenTypeAt: function(pos) {
+        pos = clipPos(this.doc, pos);
+        var styles = getLineStyles(this, getLine(this.doc, pos.line));
+        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
+        var type;
+        if (ch == 0) { type = styles[2]; }
+        else { for (;;) {
+          var mid = (before + after) >> 1;
+          if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }
+          else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }
+          else { type = styles[mid * 2 + 2]; break }
+        } }
+        var cut = type ? type.indexOf("overlay ") : -1;
+        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
+      },
+
+      getModeAt: function(pos) {
+        var mode = this.doc.mode;
+        if (!mode.innerMode) { return mode }
+        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
+      },
+
+      getHelper: function(pos, type) {
+        return this.getHelpers(pos, type)[0]
+      },
+
+      getHelpers: function(pos, type) {
+        var found = [];
+        if (!helpers.hasOwnProperty(type)) { return found }
+        var help = helpers[type], mode = this.getModeAt(pos);
+        if (typeof mode[type] == "string") {
+          if (help[mode[type]]) { found.push(help[mode[type]]); }
+        } else if (mode[type]) {
+          for (var i = 0; i < mode[type].length; i++) {
+            var val = help[mode[type][i]];
+            if (val) { found.push(val); }
+          }
+        } else if (mode.helperType && help[mode.helperType]) {
+          found.push(help[mode.helperType]);
+        } else if (help[mode.name]) {
+          found.push(help[mode.name]);
+        }
+        for (var i$1 = 0; i$1 < help._global.length; i$1++) {
+          var cur = help._global[i$1];
+          if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
+            { found.push(cur.val); }
+        }
+        return found
+      },
+
+      getStateAfter: function(line, precise) {
+        var doc = this.doc;
+        line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
+        return getContextBefore(this, line + 1, precise).state
+      },
+
+      cursorCoords: function(start, mode) {
+        var pos, range = this.doc.sel.primary();
+        if (start == null) { pos = range.head; }
+        else if (typeof start == "object") { pos = clipPos(this.doc, start); }
+        else { pos = start ? range.from() : range.to(); }
+        return cursorCoords(this, pos, mode || "page")
+      },
+
+      charCoords: function(pos, mode) {
+        return charCoords(this, clipPos(this.doc, pos), mode || "page")
+      },
+
+      coordsChar: function(coords, mode) {
+        coords = fromCoordSystem(this, coords, mode || "page");
+        return coordsChar(this, coords.left, coords.top)
+      },
+
+      lineAtHeight: function(height, mode) {
+        height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
+        return lineAtHeight(this.doc, height + this.display.viewOffset)
+      },
+      heightAtLine: function(line, mode, includeWidgets) {
+        var end = false, lineObj;
+        if (typeof line == "number") {
+          var last = this.doc.first + this.doc.size - 1;
+          if (line < this.doc.first) { line = this.doc.first; }
+          else if (line > last) { line = last; end = true; }
+          lineObj = getLine(this.doc, line);
+        } else {
+          lineObj = line;
+        }
+        return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
+          (end ? this.doc.height - heightAtLine(lineObj) : 0)
+      },
+
+      defaultTextHeight: function() { return textHeight(this.display) },
+      defaultCharWidth: function() { return charWidth(this.display) },
+
+      getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},
+
+      addWidget: function(pos, node, scroll, vert, horiz) {
+        var display = this.display;
+        pos = cursorCoords(this, clipPos(this.doc, pos));
+        var top = pos.bottom, left = pos.left;
+        node.style.position = "absolute";
+        node.setAttribute("cm-ignore-events", "true");
+        this.display.input.setUneditable(node);
+        display.sizer.appendChild(node);
+        if (vert == "over") {
+          top = pos.top;
+        } else if (vert == "above" || vert == "near") {
+          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
+          hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
+          // Default to positioning above (if specified and possible); otherwise default to positioning below
+          if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
+            { top = pos.top - node.offsetHeight; }
+          else if (pos.bottom + node.offsetHeight <= vspace)
+            { top = pos.bottom; }
+          if (left + node.offsetWidth > hspace)
+            { left = hspace - node.offsetWidth; }
+        }
+        node.style.top = top + "px";
+        node.style.left = node.style.right = "";
+        if (horiz == "right") {
+          left = display.sizer.clientWidth - node.offsetWidth;
+          node.style.right = "0px";
+        } else {
+          if (horiz == "left") { left = 0; }
+          else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }
+          node.style.left = left + "px";
+        }
+        if (scroll)
+          { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }
+      },
+
+      triggerOnKeyDown: methodOp(onKeyDown),
+      triggerOnKeyPress: methodOp(onKeyPress),
+      triggerOnKeyUp: onKeyUp,
+      triggerOnMouseDown: methodOp(onMouseDown),
+
+      execCommand: function(cmd) {
+        if (commands.hasOwnProperty(cmd))
+          { return commands[cmd].call(null, this) }
+      },
+
+      triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),
+
+      findPosH: function(from, amount, unit, visually) {
+        var dir = 1;
+        if (amount < 0) { dir = -1; amount = -amount; }
+        var cur = clipPos(this.doc, from);
+        for (var i = 0; i < amount; ++i) {
+          cur = findPosH(this.doc, cur, dir, unit, visually);
+          if (cur.hitSide) { break }
+        }
+        return cur
+      },
+
+      moveH: methodOp(function(dir, unit) {
+        var this$1 = this;
+
+        this.extendSelectionsBy(function (range) {
+          if (this$1.display.shift || this$1.doc.extend || range.empty())
+            { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
+          else
+            { return dir < 0 ? range.from() : range.to() }
+        }, sel_move);
+      }),
+
+      deleteH: methodOp(function(dir, unit) {
+        var sel = this.doc.sel, doc = this.doc;
+        if (sel.somethingSelected())
+          { doc.replaceSelection("", null, "+delete"); }
+        else
+          { deleteNearSelection(this, function (range) {
+            var other = findPosH(doc, range.head, dir, unit, false);
+            return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}
+          }); }
+      }),
+
+      findPosV: function(from, amount, unit, goalColumn) {
+        var dir = 1, x = goalColumn;
+        if (amount < 0) { dir = -1; amount = -amount; }
+        var cur = clipPos(this.doc, from);
+        for (var i = 0; i < amount; ++i) {
+          var coords = cursorCoords(this, cur, "div");
+          if (x == null) { x = coords.left; }
+          else { coords.left = x; }
+          cur = findPosV(this, coords, dir, unit);
+          if (cur.hitSide) { break }
+        }
+        return cur
+      },
+
+      moveV: methodOp(function(dir, unit) {
+        var this$1 = this;
+
+        var doc = this.doc, goals = [];
+        var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
+        doc.extendSelectionsBy(function (range) {
+          if (collapse)
+            { return dir < 0 ? range.from() : range.to() }
+          var headPos = cursorCoords(this$1, range.head, "div");
+          if (range.goalColumn != null) { headPos.left = range.goalColumn; }
+          goals.push(headPos.left);
+          var pos = findPosV(this$1, headPos, dir, unit);
+          if (unit == "page" && range == doc.sel.primary())
+            { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top); }
+          return pos
+        }, sel_move);
+        if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
+          { doc.sel.ranges[i].goalColumn = goals[i]; } }
+      }),
+
+      // Find the word at the given position (as returned by coordsChar).
+      findWordAt: function(pos) {
+        var doc = this.doc, line = getLine(doc, pos.line).text;
+        var start = pos.ch, end = pos.ch;
+        if (line) {
+          var helper = this.getHelper(pos, "wordChars");
+          if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end; }
+          var startChar = line.charAt(start);
+          var check = isWordChar(startChar, helper)
+            ? function (ch) { return isWordChar(ch, helper); }
+            : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
+            : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); };
+          while (start > 0 && check(line.charAt(start - 1))) { --start; }
+          while (end < line.length && check(line.charAt(end))) { ++end; }
+        }
+        return new Range(Pos(pos.line, start), Pos(pos.line, end))
+      },
+
+      toggleOverwrite: function(value) {
+        if (value != null && value == this.state.overwrite) { return }
+        if (this.state.overwrite = !this.state.overwrite)
+          { addClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
+        else
+          { rmClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
+
+        signal(this, "overwriteToggle", this, this.state.overwrite);
+      },
+      hasFocus: function() { return this.display.input.getField() == activeElt() },
+      isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },
+
+      scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),
+      getScrollInfo: function() {
+        var scroller = this.display.scroller;
+        return {left: scroller.scrollLeft, top: scroller.scrollTop,
+                height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
+                width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
+                clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
+      },
+
+      scrollIntoView: methodOp(function(range, margin) {
+        if (range == null) {
+          range = {from: this.doc.sel.primary().head, to: null};
+          if (margin == null) { margin = this.options.cursorScrollMargin; }
+        } else if (typeof range == "number") {
+          range = {from: Pos(range, 0), to: null};
+        } else if (range.from == null) {
+          range = {from: range, to: null};
+        }
+        if (!range.to) { range.to = range.from; }
+        range.margin = margin || 0;
+
+        if (range.from.line != null) {
+          scrollToRange(this, range);
+        } else {
+          scrollToCoordsRange(this, range.from, range.to, range.margin);
+        }
+      }),
+
+      setSize: methodOp(function(width, height) {
+        var this$1 = this;
+
+        var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; };
+        if (width != null) { this.display.wrapper.style.width = interpret(width); }
+        if (height != null) { this.display.wrapper.style.height = interpret(height); }
+        if (this.options.lineWrapping) { clearLineMeasurementCache(this); }
+        var lineNo = this.display.viewFrom;
+        this.doc.iter(lineNo, this.display.viewTo, function (line) {
+          if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
+            { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }
+          ++lineNo;
+        });
+        this.curOp.forceUpdate = true;
+        signal(this, "refresh", this);
+      }),
+
+      operation: function(f){return runInOp(this, f)},
+      startOperation: function(){return startOperation(this)},
+      endOperation: function(){return endOperation(this)},
+
+      refresh: methodOp(function() {
+        var oldHeight = this.display.cachedTextHeight;
+        regChange(this);
+        this.curOp.forceUpdate = true;
+        clearCaches(this);
+        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
+        updateGutterSpace(this.display);
+        if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping)
+          { estimateLineHeights(this); }
+        signal(this, "refresh", this);
+      }),
+
+      swapDoc: methodOp(function(doc) {
+        var old = this.doc;
+        old.cm = null;
+        // Cancel the current text selection if any (#5821)
+        if (this.state.selectingText) { this.state.selectingText(); }
+        attachDoc(this, doc);
+        clearCaches(this);
+        this.display.input.reset();
+        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
+        this.curOp.forceScroll = true;
+        signalLater(this, "swapDoc", this, old);
+        return old
+      }),
+
+      phrase: function(phraseText) {
+        var phrases = this.options.phrases;
+        return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText
+      },
+
+      getInputField: function(){return this.display.input.getField()},
+      getWrapperElement: function(){return this.display.wrapper},
+      getScrollerElement: function(){return this.display.scroller},
+      getGutterElement: function(){return this.display.gutters}
+    };
+    eventMixin(CodeMirror);
+
+    CodeMirror.registerHelper = function(type, name, value) {
+      if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }
+      helpers[type][name] = value;
+    };
+    CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
+      CodeMirror.registerHelper(type, name, value);
+      helpers[type]._global.push({pred: predicate, val: value});
+    };
+  }
+
+  // Used for horizontal relative motion. Dir is -1 or 1 (left or
+  // right), unit can be "codepoint", "char", "column" (like char, but
+  // doesn't cross line boundaries), "word" (across next word), or
+  // "group" (to the start of next group of word or
+  // non-word-non-whitespace chars). The visually param controls
+  // whether, in right-to-left text, direction 1 means to move towards
+  // the next index in the string, or towards the character to the right
+  // of the current position. The resulting position will have a
+  // hitSide=true property if it reached the end of the document.
+  function findPosH(doc, pos, dir, unit, visually) {
+    var oldPos = pos;
+    var origDir = dir;
+    var lineObj = getLine(doc, pos.line);
+    var lineDir = visually && doc.direction == "rtl" ? -dir : dir;
+    function findNextLine() {
+      var l = pos.line + lineDir;
+      if (l < doc.first || l >= doc.first + doc.size) { return false }
+      pos = new Pos(l, pos.ch, pos.sticky);
+      return lineObj = getLine(doc, l)
+    }
+    function moveOnce(boundToLine) {
+      var next;
+      if (unit == "codepoint") {
+        var ch = lineObj.text.charCodeAt(pos.ch + (dir > 0 ? 0 : -1));
+        if (isNaN(ch)) {
+          next = null;
+        } else {
+          var astral = dir > 0 ? ch >= 0xD800 && ch < 0xDC00 : ch >= 0xDC00 && ch < 0xDFFF;
+          next = new Pos(pos.line, Math.max(0, Math.min(lineObj.text.length, pos.ch + dir * (astral ? 2 : 1))), -dir);
+        }
+      } else if (visually) {
+        next = moveVisually(doc.cm, lineObj, pos, dir);
+      } else {
+        next = moveLogically(lineObj, pos, dir);
+      }
+      if (next == null) {
+        if (!boundToLine && findNextLine())
+          { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }
+        else
+          { return false }
+      } else {
+        pos = next;
+      }
+      return true
+    }
+
+    if (unit == "char" || unit == "codepoint") {
+      moveOnce();
+    } else if (unit == "column") {
+      moveOnce(true);
+    } else if (unit == "word" || unit == "group") {
+      var sawType = null, group = unit == "group";
+      var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
+      for (var first = true;; first = false) {
+        if (dir < 0 && !moveOnce(!first)) { break }
+        var cur = lineObj.text.charAt(pos.ch) || "\n";
+        var type = isWordChar(cur, helper) ? "w"
+          : group && cur == "\n" ? "n"
+          : !group || /\s/.test(cur) ? null
+          : "p";
+        if (group && !first && !type) { type = "s"; }
+        if (sawType && sawType != type) {
+          if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after";}
+          break
+        }
+
+        if (type) { sawType = type; }
+        if (dir > 0 && !moveOnce(!first)) { break }
+      }
+    }
+    var result = skipAtomic(doc, pos, oldPos, origDir, true);
+    if (equalCursorPos(oldPos, result)) { result.hitSide = true; }
+    return result
+  }
+
+  // For relative vertical movement. Dir may be -1 or 1. Unit can be
+  // "page" or "line". The resulting position will have a hitSide=true
+  // property if it reached the end of the document.
+  function findPosV(cm, pos, dir, unit) {
+    var doc = cm.doc, x = pos.left, y;
+    if (unit == "page") {
+      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+      var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
+      y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;
+
+    } else if (unit == "line") {
+      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
+    }
+    var target;
+    for (;;) {
+      target = coordsChar(cm, x, y);
+      if (!target.outside) { break }
+      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
+      y += dir * 5;
+    }
+    return target
+  }
+
+  // CONTENTEDITABLE INPUT STYLE
+
+  var ContentEditableInput = function(cm) {
+    this.cm = cm;
+    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
+    this.polling = new Delayed();
+    this.composing = null;
+    this.gracePeriod = false;
+    this.readDOMTimeout = null;
+  };
+
+  ContentEditableInput.prototype.init = function (display) {
+      var this$1 = this;
+
+    var input = this, cm = input.cm;
+    var div = input.div = display.lineDiv;
+    div.contentEditable = true;
+    disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);
+
+    function belongsToInput(e) {
+      for (var t = e.target; t; t = t.parentNode) {
+        if (t == div) { return true }
+        if (/\bCodeMirror-(?:line)?widget\b/.test(t.className)) { break }
+      }
+      return false
+    }
+
+    on(div, "paste", function (e) {
+      if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
+      // IE doesn't fire input events, so we schedule a read for the pasted content in this way
+      if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }
+    });
+
+    on(div, "compositionstart", function (e) {
+      this$1.composing = {data: e.data, done: false};
+    });
+    on(div, "compositionupdate", function (e) {
+      if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }
+    });
+    on(div, "compositionend", function (e) {
+      if (this$1.composing) {
+        if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }
+        this$1.composing.done = true;
+      }
+    });
+
+    on(div, "touchstart", function () { return input.forceCompositionEnd(); });
+
+    on(div, "input", function () {
+      if (!this$1.composing) { this$1.readFromDOMSoon(); }
+    });
+
+    function onCopyCut(e) {
+      if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }
+      if (cm.somethingSelected()) {
+        setLastCopied({lineWise: false, text: cm.getSelections()});
+        if (e.type == "cut") { cm.replaceSelection("", null, "cut"); }
+      } else if (!cm.options.lineWiseCopyCut) {
+        return
+      } else {
+        var ranges = copyableRanges(cm);
+        setLastCopied({lineWise: true, text: ranges.text});
+        if (e.type == "cut") {
+          cm.operation(function () {
+            cm.setSelections(ranges.ranges, 0, sel_dontScroll);
+            cm.replaceSelection("", null, "cut");
+          });
+        }
+      }
+      if (e.clipboardData) {
+        e.clipboardData.clearData();
+        var content = lastCopied.text.join("\n");
+        // iOS exposes the clipboard API, but seems to discard content inserted into it
+        e.clipboardData.setData("Text", content);
+        if (e.clipboardData.getData("Text") == content) {
+          e.preventDefault();
+          return
+        }
+      }
+      // Old-fashioned briefly-focus-a-textarea hack
+      var kludge = hiddenTextarea(), te = kludge.firstChild;
+      cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
+      te.value = lastCopied.text.join("\n");
+      var hadFocus = activeElt();
+      selectInput(te);
+      setTimeout(function () {
+        cm.display.lineSpace.removeChild(kludge);
+        hadFocus.focus();
+        if (hadFocus == div) { input.showPrimarySelection(); }
+      }, 50);
+    }
+    on(div, "copy", onCopyCut);
+    on(div, "cut", onCopyCut);
+  };
+
+  ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {
+    // Label for screenreaders, accessibility
+    if(label) {
+      this.div.setAttribute('aria-label', label);
+    } else {
+      this.div.removeAttribute('aria-label');
+    }
+  };
+
+  ContentEditableInput.prototype.prepareSelection = function () {
+    var result = prepareSelection(this.cm, false);
+    result.focus = activeElt() == this.div;
+    return result
+  };
+
+  ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
+    if (!info || !this.cm.display.view.length) { return }
+    if (info.focus || takeFocus) { this.showPrimarySelection(); }
+    this.showMultipleSelections(info);
+  };
+
+  ContentEditableInput.prototype.getSelection = function () {
+    return this.cm.display.wrapper.ownerDocument.getSelection()
+  };
+
+  ContentEditableInput.prototype.showPrimarySelection = function () {
+    var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
+    var from = prim.from(), to = prim.to();
+
+    if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
+      sel.removeAllRanges();
+      return
+    }
+
+    var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
+    var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
+    if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
+        cmp(minPos(curAnchor, curFocus), from) == 0 &&
+        cmp(maxPos(curAnchor, curFocus), to) == 0)
+      { return }
+
+    var view = cm.display.view;
+    var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
+        {node: view[0].measure.map[2], offset: 0};
+    var end = to.line < cm.display.viewTo && posToDOM(cm, to);
+    if (!end) {
+      var measure = view[view.length - 1].measure;
+      var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
+      end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
+    }
+
+    if (!start || !end) {
+      sel.removeAllRanges();
+      return
+    }
+
+    var old = sel.rangeCount && sel.getRangeAt(0), rng;
+    try { rng = range(start.node, start.offset, end.offset, end.node); }
+    catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
+    if (rng) {
+      if (!gecko && cm.state.focused) {
+        sel.collapse(start.node, start.offset);
+        if (!rng.collapsed) {
+          sel.removeAllRanges();
+          sel.addRange(rng);
+        }
+      } else {
+        sel.removeAllRanges();
+        sel.addRange(rng);
+      }
+      if (old && sel.anchorNode == null) { sel.addRange(old); }
+      else if (gecko) { this.startGracePeriod(); }
+    }
+    this.rememberSelection();
+  };
+
+  ContentEditableInput.prototype.startGracePeriod = function () {
+      var this$1 = this;
+
+    clearTimeout(this.gracePeriod);
+    this.gracePeriod = setTimeout(function () {
+      this$1.gracePeriod = false;
+      if (this$1.selectionChanged())
+        { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }
+    }, 20);
+  };
+
+  ContentEditableInput.prototype.showMultipleSelections = function (info) {
+    removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
+    removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
+  };
+
+  ContentEditableInput.prototype.rememberSelection = function () {
+    var sel = this.getSelection();
+    this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
+    this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
+  };
+
+  ContentEditableInput.prototype.selectionInEditor = function () {
+    var sel = this.getSelection();
+    if (!sel.rangeCount) { return false }
+    var node = sel.getRangeAt(0).commonAncestorContainer;
+    return contains(this.div, node)
+  };
+
+  ContentEditableInput.prototype.focus = function () {
+    if (this.cm.options.readOnly != "nocursor") {
+      if (!this.selectionInEditor() || activeElt() != this.div)
+        { this.showSelection(this.prepareSelection(), true); }
+      this.div.focus();
+    }
+  };
+  ContentEditableInput.prototype.blur = function () { this.div.blur(); };
+  ContentEditableInput.prototype.getField = function () { return this.div };
+
+  ContentEditableInput.prototype.supportsTouch = function () { return true };
+
+  ContentEditableInput.prototype.receivedFocus = function () {
+      var this$1 = this;
+
+    var input = this;
+    if (this.selectionInEditor())
+      { setTimeout(function () { return this$1.pollSelection(); }, 20); }
+    else
+      { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }
+
+    function poll() {
+      if (input.cm.state.focused) {
+        input.pollSelection();
+        input.polling.set(input.cm.options.pollInterval, poll);
+      }
+    }
+    this.polling.set(this.cm.options.pollInterval, poll);
+  };
+
+  ContentEditableInput.prototype.selectionChanged = function () {
+    var sel = this.getSelection();
+    return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
+      sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
+  };
+
+  ContentEditableInput.prototype.pollSelection = function () {
+    if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
+    var sel = this.getSelection(), cm = this.cm;
+    // On Android Chrome (version 56, at least), backspacing into an
+    // uneditable block element will put the cursor in that element,
+    // and then, because it's not editable, hide the virtual keyboard.
+    // Because Android doesn't allow us to actually detect backspace
+    // presses in a sane way, this code checks for when that happens
+    // and simulates a backspace press in this case.
+    if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {
+      this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs});
+      this.blur();
+      this.focus();
+      return
+    }
+    if (this.composing) { return }
+    this.rememberSelection();
+    var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
+    var head = domToPos(cm, sel.focusNode, sel.focusOffset);
+    if (anchor && head) { runInOp(cm, function () {
+      setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
+      if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }
+    }); }
+  };
+
+  ContentEditableInput.prototype.pollContent = function () {
+    if (this.readDOMTimeout != null) {
+      clearTimeout(this.readDOMTimeout);
+      this.readDOMTimeout = null;
+    }
+
+    var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
+    var from = sel.from(), to = sel.to();
+    if (from.ch == 0 && from.line > cm.firstLine())
+      { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }
+    if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
+      { to = Pos(to.line + 1, 0); }
+    if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }
+
+    var fromIndex, fromLine, fromNode;
+    if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
+      fromLine = lineNo(display.view[0].line);
+      fromNode = display.view[0].node;
+    } else {
+      fromLine = lineNo(display.view[fromIndex].line);
+      fromNode = display.view[fromIndex - 1].node.nextSibling;
+    }
+    var toIndex = findViewIndex(cm, to.line);
+    var toLine, toNode;
+    if (toIndex == display.view.length - 1) {
+      toLine = display.viewTo - 1;
+      toNode = display.lineDiv.lastChild;
+    } else {
+      toLine = lineNo(display.view[toIndex + 1].line) - 1;
+      toNode = display.view[toIndex + 1].node.previousSibling;
+    }
+
+    if (!fromNode) { return false }
+    var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
+    var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
+    while (newText.length > 1 && oldText.length > 1) {
+      if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
+      else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
+      else { break }
+    }
+
+    var cutFront = 0, cutEnd = 0;
+    var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
+    while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
+      { ++cutFront; }
+    var newBot = lst(newText), oldBot = lst(oldText);
+    var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
+                             oldBot.length - (oldText.length == 1 ? cutFront : 0));
+    while (cutEnd < maxCutEnd &&
+           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
+      { ++cutEnd; }
+    // Try to move start of change to start of selection if ambiguous
+    if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
+      while (cutFront && cutFront > from.ch &&
+             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
+        cutFront--;
+        cutEnd++;
+      }
+    }
+
+    newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
+    newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");
+
+    var chFrom = Pos(fromLine, cutFront);
+    var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
+    if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
+      replaceRange(cm.doc, newText, chFrom, chTo, "+input");
+      return true
+    }
+  };
+
+  ContentEditableInput.prototype.ensurePolled = function () {
+    this.forceCompositionEnd();
+  };
+  ContentEditableInput.prototype.reset = function () {
+    this.forceCompositionEnd();
+  };
+  ContentEditableInput.prototype.forceCompositionEnd = function () {
+    if (!this.composing) { return }
+    clearTimeout(this.readDOMTimeout);
+    this.composing = null;
+    this.updateFromDOM();
+    this.div.blur();
+    this.div.focus();
+  };
+  ContentEditableInput.prototype.readFromDOMSoon = function () {
+      var this$1 = this;
+
+    if (this.readDOMTimeout != null) { return }
+    this.readDOMTimeout = setTimeout(function () {
+      this$1.readDOMTimeout = null;
+      if (this$1.composing) {
+        if (this$1.composing.done) { this$1.composing = null; }
+        else { return }
+      }
+      this$1.updateFromDOM();
+    }, 80);
+  };
+
+  ContentEditableInput.prototype.updateFromDOM = function () {
+      var this$1 = this;
+
+    if (this.cm.isReadOnly() || !this.pollContent())
+      { runInOp(this.cm, function () { return regChange(this$1.cm); }); }
+  };
+
+  ContentEditableInput.prototype.setUneditable = function (node) {
+    node.contentEditable = "false";
+  };
+
+  ContentEditableInput.prototype.onKeyPress = function (e) {
+    if (e.charCode == 0 || this.composing) { return }
+    e.preventDefault();
+    if (!this.cm.isReadOnly())
+      { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }
+  };
+
+  ContentEditableInput.prototype.readOnlyChanged = function (val) {
+    this.div.contentEditable = String(val != "nocursor");
+  };
+
+  ContentEditableInput.prototype.onContextMenu = function () {};
+  ContentEditableInput.prototype.resetPosition = function () {};
+
+  ContentEditableInput.prototype.needsContentAttribute = true;
+
+  function posToDOM(cm, pos) {
+    var view = findViewForLine(cm, pos.line);
+    if (!view || view.hidden) { return null }
+    var line = getLine(cm.doc, pos.line);
+    var info = mapFromLineView(view, line, pos.line);
+
+    var order = getOrder(line, cm.doc.direction), side = "left";
+    if (order) {
+      var partPos = getBidiPartAt(order, pos.ch);
+      side = partPos % 2 ? "right" : "left";
+    }
+    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
+    result.offset = result.collapse == "right" ? result.end : result.start;
+    return result
+  }
+
+  function isInGutter(node) {
+    for (var scan = node; scan; scan = scan.parentNode)
+      { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
+    return false
+  }
+
+  function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }
+
+  function domTextBetween(cm, from, to, fromLine, toLine) {
+    var text = "", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;
+    function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
+    function close() {
+      if (closing) {
+        text += lineSep;
+        if (extraLinebreak) { text += lineSep; }
+        closing = extraLinebreak = false;
+      }
+    }
+    function addText(str) {
+      if (str) {
+        close();
+        text += str;
+      }
+    }
+    function walk(node) {
+      if (node.nodeType == 1) {
+        var cmText = node.getAttribute("cm-text");
+        if (cmText) {
+          addText(cmText);
+          return
+        }
+        var markerID = node.getAttribute("cm-marker"), range;
+        if (markerID) {
+          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
+          if (found.length && (range = found[0].find(0)))
+            { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }
+          return
+        }
+        if (node.getAttribute("contenteditable") == "false") { return }
+        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
+        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }
+
+        if (isBlock) { close(); }
+        for (var i = 0; i < node.childNodes.length; i++)
+          { walk(node.childNodes[i]); }
+
+        if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }
+        if (isBlock) { closing = true; }
+      } else if (node.nodeType == 3) {
+        addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
+      }
+    }
+    for (;;) {
+      walk(from);
+      if (from == to) { break }
+      from = from.nextSibling;
+      extraLinebreak = false;
+    }
+    return text
+  }
+
+  function domToPos(cm, node, offset) {
+    var lineNode;
+    if (node == cm.display.lineDiv) {
+      lineNode = cm.display.lineDiv.childNodes[offset];
+      if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
+      node = null; offset = 0;
+    } else {
+      for (lineNode = node;; lineNode = lineNode.parentNode) {
+        if (!lineNode || lineNode == cm.display.lineDiv) { return null }
+        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
+      }
+    }
+    for (var i = 0; i < cm.display.view.length; i++) {
+      var lineView = cm.display.view[i];
+      if (lineView.node == lineNode)
+        { return locateNodeInLineView(lineView, node, offset) }
+    }
+  }
+
+  function locateNodeInLineView(lineView, node, offset) {
+    var wrapper = lineView.text.firstChild, bad = false;
+    if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
+    if (node == wrapper) {
+      bad = true;
+      node = wrapper.childNodes[offset];
+      offset = 0;
+      if (!node) {
+        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
+        return badPos(Pos(lineNo(line), line.text.length), bad)
+      }
+    }
+
+    var textNode = node.nodeType == 3 ? node : null, topNode = node;
+    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
+      textNode = node.firstChild;
+      if (offset) { offset = textNode.nodeValue.length; }
+    }
+    while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }
+    var measure = lineView.measure, maps = measure.maps;
+
+    function find(textNode, topNode, offset) {
+      for (var i = -1; i < (maps ? maps.length : 0); i++) {
+        var map = i < 0 ? measure.map : maps[i];
+        for (var j = 0; j < map.length; j += 3) {
+          var curNode = map[j + 2];
+          if (curNode == textNode || curNode == topNode) {
+            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
+            var ch = map[j] + offset;
+            if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }
+            return Pos(line, ch)
+          }
+        }
+      }
+    }
+    var found = find(textNode, topNode, offset);
+    if (found) { return badPos(found, bad) }
+
+    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
+    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
+      found = find(after, after.firstChild, 0);
+      if (found)
+        { return badPos(Pos(found.line, found.ch - dist), bad) }
+      else
+        { dist += after.textContent.length; }
+    }
+    for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
+      found = find(before, before.firstChild, -1);
+      if (found)
+        { return badPos(Pos(found.line, found.ch + dist$1), bad) }
+      else
+        { dist$1 += before.textContent.length; }
+    }
+  }
+
+  // TEXTAREA INPUT STYLE
+
+  var TextareaInput = function(cm) {
+    this.cm = cm;
+    // See input.poll and input.reset
+    this.prevInput = "";
+
+    // Flag that indicates whether we expect input to appear real soon
+    // now (after some event like 'keypress' or 'input') and are
+    // polling intensively.
+    this.pollingFast = false;
+    // Self-resetting timeout for the poller
+    this.polling = new Delayed();
+    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
+    this.hasSelection = false;
+    this.composing = null;
+  };
+
+  TextareaInput.prototype.init = function (display) {
+      var this$1 = this;
+
+    var input = this, cm = this.cm;
+    this.createField(display);
+    var te = this.textarea;
+
+    display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);
+
+    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
+    if (ios) { te.style.width = "0px"; }
+
+    on(te, "input", function () {
+      if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }
+      input.poll();
+    });
+
+    on(te, "paste", function (e) {
+      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
+
+      cm.state.pasteIncoming = +new Date;
+      input.fastPoll();
+    });
+
+    function prepareCopyCut(e) {
+      if (signalDOMEvent(cm, e)) { return }
+      if (cm.somethingSelected()) {
+        setLastCopied({lineWise: false, text: cm.getSelections()});
+      } else if (!cm.options.lineWiseCopyCut) {
+        return
+      } else {
+        var ranges = copyableRanges(cm);
+        setLastCopied({lineWise: true, text: ranges.text});
+        if (e.type == "cut") {
+          cm.setSelections(ranges.ranges, null, sel_dontScroll);
+        } else {
+          input.prevInput = "";
+          te.value = ranges.text.join("\n");
+          selectInput(te);
+        }
+      }
+      if (e.type == "cut") { cm.state.cutIncoming = +new Date; }
+    }
+    on(te, "cut", prepareCopyCut);
+    on(te, "copy", prepareCopyCut);
+
+    on(display.scroller, "paste", function (e) {
+      if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
+      if (!te.dispatchEvent) {
+        cm.state.pasteIncoming = +new Date;
+        input.focus();
+        return
+      }
+
+      // Pass the `paste` event to the textarea so it's handled by its event listener.
+      var event = new Event("paste");
+      event.clipboardData = e.clipboardData;
+      te.dispatchEvent(event);
+    });
+
+    // Prevent normal selection in the editor (we handle our own)
+    on(display.lineSpace, "selectstart", function (e) {
+      if (!eventInWidget(display, e)) { e_preventDefault(e); }
+    });
+
+    on(te, "compositionstart", function () {
+      var start = cm.getCursor("from");
+      if (input.composing) { input.composing.range.clear(); }
+      input.composing = {
+        start: start,
+        range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
+      };
+    });
+    on(te, "compositionend", function () {
+      if (input.composing) {
+        input.poll();
+        input.composing.range.clear();
+        input.composing = null;
+      }
+    });
+  };
+
+  TextareaInput.prototype.createField = function (_display) {
+    // Wraps and hides input textarea
+    this.wrapper = hiddenTextarea();
+    // The semihidden textarea that is focused when the editor is
+    // focused, and receives input.
+    this.textarea = this.wrapper.firstChild;
+  };
+
+  TextareaInput.prototype.screenReaderLabelChanged = function (label) {
+    // Label for screenreaders, accessibility
+    if(label) {
+      this.textarea.setAttribute('aria-label', label);
+    } else {
+      this.textarea.removeAttribute('aria-label');
+    }
+  };
+
+  TextareaInput.prototype.prepareSelection = function () {
+    // Redraw the selection and/or cursor
+    var cm = this.cm, display = cm.display, doc = cm.doc;
+    var result = prepareSelection(cm);
+
+    // Move the hidden textarea near the cursor to prevent scrolling artifacts
+    if (cm.options.moveInputWithCursor) {
+      var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
+      var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
+      result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
+                                          headPos.top + lineOff.top - wrapOff.top));
+      result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
+                                           headPos.left + lineOff.left - wrapOff.left));
+    }
+
+    return result
+  };
+
+  TextareaInput.prototype.showSelection = function (drawn) {
+    var cm = this.cm, display = cm.display;
+    removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
+    removeChildrenAndAdd(display.selectionDiv, drawn.selection);
+    if (drawn.teTop != null) {
+      this.wrapper.style.top = drawn.teTop + "px";
+      this.wrapper.style.left = drawn.teLeft + "px";
+    }
+  };
+
+  // Reset the input to correspond to the selection (or to be empty,
+  // when not typing and nothing is selected)
+  TextareaInput.prototype.reset = function (typing) {
+    if (this.contextMenuPending || this.composing) { return }
+    var cm = this.cm;
+    if (cm.somethingSelected()) {
+      this.prevInput = "";
+      var content = cm.getSelection();
+      this.textarea.value = content;
+      if (cm.state.focused) { selectInput(this.textarea); }
+      if (ie && ie_version >= 9) { this.hasSelection = content; }
+    } else if (!typing) {
+      this.prevInput = this.textarea.value = "";
+      if (ie && ie_version >= 9) { this.hasSelection = null; }
+    }
+  };
+
+  TextareaInput.prototype.getField = function () { return this.textarea };
+
+  TextareaInput.prototype.supportsTouch = function () { return false };
+
+  TextareaInput.prototype.focus = function () {
+    if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
+      try { this.textarea.focus(); }
+      catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
+    }
+  };
+
+  TextareaInput.prototype.blur = function () { this.textarea.blur(); };
+
+  TextareaInput.prototype.resetPosition = function () {
+    this.wrapper.style.top = this.wrapper.style.left = 0;
+  };
+
+  TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };
+
+  // Poll for input changes, using the normal rate of polling. This
+  // runs as long as the editor is focused.
+  TextareaInput.prototype.slowPoll = function () {
+      var this$1 = this;
+
+    if (this.pollingFast) { return }
+    this.polling.set(this.cm.options.pollInterval, function () {
+      this$1.poll();
+      if (this$1.cm.state.focused) { this$1.slowPoll(); }
+    });
+  };
+
+  // When an event has just come in that is likely to add or change
+  // something in the input textarea, we poll faster, to ensure that
+  // the change appears on the screen quickly.
+  TextareaInput.prototype.fastPoll = function () {
+    var missed = false, input = this;
+    input.pollingFast = true;
+    function p() {
+      var changed = input.poll();
+      if (!changed && !missed) {missed = true; input.polling.set(60, p);}
+      else {input.pollingFast = false; input.slowPoll();}
+    }
+    input.polling.set(20, p);
+  };
+
+  // Read input from the textarea, and update the document to match.
+  // When something is selected, it is present in the textarea, and
+  // selected (unless it is huge, in which case a placeholder is
+  // used). When nothing is selected, the cursor sits after previously
+  // seen text (can be empty), which is stored in prevInput (we must
+  // not reset the textarea when typing, because that breaks IME).
+  TextareaInput.prototype.poll = function () {
+      var this$1 = this;
+
+    var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
+    // Since this is called a *lot*, try to bail out as cheaply as
+    // possible when it is clear that nothing happened. hasSelection
+    // will be the case when there is a lot of text in the textarea,
+    // in which case reading its value would be expensive.
+    if (this.contextMenuPending || !cm.state.focused ||
+        (hasSelection(input) && !prevInput && !this.composing) ||
+        cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
+      { return false }
+
+    var text = input.value;
+    // If nothing changed, bail.
+    if (text == prevInput && !cm.somethingSelected()) { return false }
+    // Work around nonsensical selection resetting in IE9/10, and
+    // inexplicable appearance of private area unicode characters on
+    // some key combos in Mac (#2689).
+    if (ie && ie_version >= 9 && this.hasSelection === text ||
+        mac && /[\uf700-\uf7ff]/.test(text)) {
+      cm.display.input.reset();
+      return false
+    }
+
+    if (cm.doc.sel == cm.display.selForContextMenu) {
+      var first = text.charCodeAt(0);
+      if (first == 0x200b && !prevInput) { prevInput = "\u200b"; }
+      if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
+    }
+    // Find the part of the input that is actually new
+    var same = 0, l = Math.min(prevInput.length, text.length);
+    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }
+
+    runInOp(cm, function () {
+      applyTextInput(cm, text.slice(same), prevInput.length - same,
+                     null, this$1.composing ? "*compose" : null);
+
+      // Don't leave long text in the textarea, since it makes further polling slow
+      if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = ""; }
+      else { this$1.prevInput = text; }
+
+      if (this$1.composing) {
+        this$1.composing.range.clear();
+        this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
+                                           {className: "CodeMirror-composing"});
+      }
+    });
+    return true
+  };
+
+  TextareaInput.prototype.ensurePolled = function () {
+    if (this.pollingFast && this.poll()) { this.pollingFast = false; }
+  };
+
+  TextareaInput.prototype.onKeyPress = function () {
+    if (ie && ie_version >= 9) { this.hasSelection = null; }
+    this.fastPoll();
+  };
+
+  TextareaInput.prototype.onContextMenu = function (e) {
+    var input = this, cm = input.cm, display = cm.display, te = input.textarea;
+    if (input.contextMenuPending) { input.contextMenuPending(); }
+    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
+    if (!pos || presto) { return } // Opera is difficult.
+
+    // Reset the current text selection only if the click is done outside of the selection
+    // and 'resetSelectionOnContextMenu' option is true.
+    var reset = cm.options.resetSelectionOnContextMenu;
+    if (reset && cm.doc.sel.contains(pos) == -1)
+      { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }
+
+    var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
+    var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();
+    input.wrapper.style.cssText = "position: static";
+    te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
+    var oldScrollY;
+    if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)
+    display.input.focus();
+    if (webkit) { window.scrollTo(null, oldScrollY); }
+    display.input.reset();
+    // Adds "Select all" to context menu in FF
+    if (!cm.somethingSelected()) { te.value = input.prevInput = " "; }
+    input.contextMenuPending = rehide;
+    display.selForContextMenu = cm.doc.sel;
+    clearTimeout(display.detectingSelectAll);
+
+    // Select-all will be greyed out if there's nothing to select, so
+    // this adds a zero-width space so that we can later check whether
+    // it got selected.
+    function prepareSelectAllHack() {
+      if (te.selectionStart != null) {
+        var selected = cm.somethingSelected();
+        var extval = "\u200b" + (selected ? te.value : "");
+        te.value = "\u21da"; // Used to catch context-menu undo
+        te.value = extval;
+        input.prevInput = selected ? "" : "\u200b";
+        te.selectionStart = 1; te.selectionEnd = extval.length;
+        // Re-set this, in case some other handler touched the
+        // selection in the meantime.
+        display.selForContextMenu = cm.doc.sel;
+      }
+    }
+    function rehide() {
+      if (input.contextMenuPending != rehide) { return }
+      input.contextMenuPending = false;
+      input.wrapper.style.cssText = oldWrapperCSS;
+      te.style.cssText = oldCSS;
+      if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }
+
+      // Try to detect the user choosing select-all
+      if (te.selectionStart != null) {
+        if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }
+        var i = 0, poll = function () {
+          if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
+              te.selectionEnd > 0 && input.prevInput == "\u200b") {
+            operation(cm, selectAll)(cm);
+          } else if (i++ < 10) {
+            display.detectingSelectAll = setTimeout(poll, 500);
+          } else {
+            display.selForContextMenu = null;
+            display.input.reset();
+          }
+        };
+        display.detectingSelectAll = setTimeout(poll, 200);
+      }
+    }
+
+    if (ie && ie_version >= 9) { prepareSelectAllHack(); }
+    if (captureRightClick) {
+      e_stop(e);
+      var mouseup = function () {
+        off(window, "mouseup", mouseup);
+        setTimeout(rehide, 20);
+      };
+      on(window, "mouseup", mouseup);
+    } else {
+      setTimeout(rehide, 50);
+    }
+  };
+
+  TextareaInput.prototype.readOnlyChanged = function (val) {
+    if (!val) { this.reset(); }
+    this.textarea.disabled = val == "nocursor";
+    this.textarea.readOnly = !!val;
+  };
+
+  TextareaInput.prototype.setUneditable = function () {};
+
+  TextareaInput.prototype.needsContentAttribute = false;
+
+  function fromTextArea(textarea, options) {
+    options = options ? copyObj(options) : {};
+    options.value = textarea.value;
+    if (!options.tabindex && textarea.tabIndex)
+      { options.tabindex = textarea.tabIndex; }
+    if (!options.placeholder && textarea.placeholder)
+      { options.placeholder = textarea.placeholder; }
+    // Set autofocus to true if this textarea is focused, or if it has
+    // autofocus and no other element is focused.
+    if (options.autofocus == null) {
+      var hasFocus = activeElt();
+      options.autofocus = hasFocus == textarea ||
+        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
+    }
+
+    function save() {textarea.value = cm.getValue();}
+
+    var realSubmit;
+    if (textarea.form) {
+      on(textarea.form, "submit", save);
+      // Deplorable hack to make the submit method do the right thing.
+      if (!options.leaveSubmitMethodAlone) {
+        var form = textarea.form;
+        realSubmit = form.submit;
+        try {
+          var wrappedSubmit = form.submit = function () {
+            save();
+            form.submit = realSubmit;
+            form.submit();
+            form.submit = wrappedSubmit;
+          };
+        } catch(e) {}
+      }
+    }
+
+    options.finishInit = function (cm) {
+      cm.save = save;
+      cm.getTextArea = function () { return textarea; };
+      cm.toTextArea = function () {
+        cm.toTextArea = isNaN; // Prevent this from being ran twice
+        save();
+        textarea.parentNode.removeChild(cm.getWrapperElement());
+        textarea.style.display = "";
+        if (textarea.form) {
+          off(textarea.form, "submit", save);
+          if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == "function")
+            { textarea.form.submit = realSubmit; }
+        }
+      };
+    };
+
+    textarea.style.display = "none";
+    var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
+      options);
+    return cm
+  }
+
+  function addLegacyProps(CodeMirror) {
+    CodeMirror.off = off;
+    CodeMirror.on = on;
+    CodeMirror.wheelEventPixels = wheelEventPixels;
+    CodeMirror.Doc = Doc;
+    CodeMirror.splitLines = splitLinesAuto;
+    CodeMirror.countColumn = countColumn;
+    CodeMirror.findColumn = findColumn;
+    CodeMirror.isWordChar = isWordCharBasic;
+    CodeMirror.Pass = Pass;
+    CodeMirror.signal = signal;
+    CodeMirror.Line = Line;
+    CodeMirror.changeEnd = changeEnd;
+    CodeMirror.scrollbarModel = scrollbarModel;
+    CodeMirror.Pos = Pos;
+    CodeMirror.cmpPos = cmp;
+    CodeMirror.modes = modes;
+    CodeMirror.mimeModes = mimeModes;
+    CodeMirror.resolveMode = resolveMode;
+    CodeMirror.getMode = getMode;
+    CodeMirror.modeExtensions = modeExtensions;
+    CodeMirror.extendMode = extendMode;
+    CodeMirror.copyState = copyState;
+    CodeMirror.startState = startState;
+    CodeMirror.innerMode = innerMode;
+    CodeMirror.commands = commands;
+    CodeMirror.keyMap = keyMap;
+    CodeMirror.keyName = keyName;
+    CodeMirror.isModifierKey = isModifierKey;
+    CodeMirror.lookupKey = lookupKey;
+    CodeMirror.normalizeKeyMap = normalizeKeyMap;
+    CodeMirror.StringStream = StringStream;
+    CodeMirror.SharedTextMarker = SharedTextMarker;
+    CodeMirror.TextMarker = TextMarker;
+    CodeMirror.LineWidget = LineWidget;
+    CodeMirror.e_preventDefault = e_preventDefault;
+    CodeMirror.e_stopPropagation = e_stopPropagation;
+    CodeMirror.e_stop = e_stop;
+    CodeMirror.addClass = addClass;
+    CodeMirror.contains = contains;
+    CodeMirror.rmClass = rmClass;
+    CodeMirror.keyNames = keyNames;
+  }
+
+  // EDITOR CONSTRUCTOR
+
+  defineOptions(CodeMirror);
+
+  addEditorMethods(CodeMirror);
+
+  // Set up methods on CodeMirror's prototype to redirect to the editor's document.
+  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
+  for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
+    { CodeMirror.prototype[prop] = (function(method) {
+      return function() {return method.apply(this.doc, arguments)}
+    })(Doc.prototype[prop]); } }
+
+  eventMixin(Doc);
+  CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};
+
+  // Extra arguments are stored as the mode's dependencies, which is
+  // used by (legacy) mechanisms like loadmode.js to automatically
+  // load a mode. (Preferred mechanism is the require/define calls.)
+  CodeMirror.defineMode = function(name/*, mode, …*/) {
+    if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name; }
+    defineMode.apply(this, arguments);
+  };
+
+  CodeMirror.defineMIME = defineMIME;
+
+  // Minimal default mode.
+  CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });
+  CodeMirror.defineMIME("text/plain", "null");
+
+  // EXTENSIONS
+
+  CodeMirror.defineExtension = function (name, func) {
+    CodeMirror.prototype[name] = func;
+  };
+  CodeMirror.defineDocExtension = function (name, func) {
+    Doc.prototype[name] = func;
+  };
+
+  CodeMirror.fromTextArea = fromTextArea;
+
+  addLegacyProps(CodeMirror);
+
+  CodeMirror.version = "5.65.1";
+
+  return CodeMirror;
+
+})));
+});
+
+export { codemirror as c };
diff --git a/docs/_snowpack/pkg/common/index-c9e50cb4.js b/docs/_snowpack/pkg/common/index-04edb6a1.js
similarity index 99%
rename from docs/_snowpack/pkg/common/index-c9e50cb4.js
rename to docs/_snowpack/pkg/common/index-04edb6a1.js
index 5665ff62..9993b955 100644
--- a/docs/_snowpack/pkg/common/index-c9e50cb4.js
+++ b/docs/_snowpack/pkg/common/index-04edb6a1.js
@@ -1,4 +1,4 @@
-import { c as createCommonjsModule } from './_commonjsHelpers-913f9c4a.js';
+import { c as createCommonjsModule } from './_commonjsHelpers-8c19dec8.js';
 
 /*
 object-assign
diff --git a/docs/_snowpack/pkg/fractionjs.js b/docs/_snowpack/pkg/fractionjs.js
index c38a2ae1..c42e3b5b 100644
--- a/docs/_snowpack/pkg/fractionjs.js
+++ b/docs/_snowpack/pkg/fractionjs.js
@@ -1,4 +1,4 @@
-import { g as getDefaultExportFromCjs, c as createCommonjsModule } from './common/_commonjsHelpers-913f9c4a.js';
+import { g as getDefaultExportFromCjs, c as createCommonjsModule } from './common/_commonjsHelpers-8c19dec8.js';
 
 var fraction = createCommonjsModule(function (module, exports) {
 /**
diff --git a/docs/_snowpack/pkg/import-map.json b/docs/_snowpack/pkg/import-map.json
index e4c35bfb..314df7d0 100644
--- a/docs/_snowpack/pkg/import-map.json
+++ b/docs/_snowpack/pkg/import-map.json
@@ -1,7 +1,13 @@
 {
   "imports": {
+    "@tonaljs/tonal": "./@tonaljs/tonal.js",
+    "codemirror/lib/codemirror.css": "./codemirror/lib/codemirror.css",
+    "codemirror/mode/javascript/javascript.js": "./codemirror/mode/javascript/javascript.js",
+    "codemirror/mode/pegjs/pegjs.js": "./codemirror/mode/pegjs/pegjs.js",
+    "codemirror/theme/material.css": "./codemirror/theme/material.css",
     "fraction.js": "./fractionjs.js",
     "react": "./react.js",
+    "react-codemirror2": "./react-codemirror2.js",
     "react-dom": "./react-dom.js",
     "tone": "./tone.js"
   }
diff --git a/docs/_snowpack/pkg/react-codemirror2.js b/docs/_snowpack/pkg/react-codemirror2.js
new file mode 100644
index 00000000..9b35323d
--- /dev/null
+++ b/docs/_snowpack/pkg/react-codemirror2.js
@@ -0,0 +1,788 @@
+import { c as createCommonjsModule, a as commonjsGlobal } from './common/_commonjsHelpers-8c19dec8.js';
+import { r as react } from './common/index-04edb6a1.js';
+import { c as codemirror } from './common/codemirror-d650d44d.js';
+
+var reactCodemirror2 = createCommonjsModule(function (module, exports) {
+
+function _extends() {
+  _extends = Object.assign || function(target) {
+    for (var i = 1; i < arguments.length; i++) {
+      var source = arguments[i];
+      for (var key in source) {
+        if (Object.prototype.hasOwnProperty.call(source, key)) {
+          target[key] = source[key];
+        }
+      }
+    }
+    return target;
+  };
+  return _extends.apply(this, arguments);
+}
+
+function _typeof(obj) {
+  "@babel/helpers - typeof";
+  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+    _typeof = function _typeof(obj) {
+      return typeof obj;
+    };
+  } else {
+    _typeof = function _typeof(obj) {
+      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+    };
+  }
+  return _typeof(obj);
+}
+
+var __extends =  function() {
+  var _extendStatics = function extendStatics(d, b) {
+    _extendStatics = Object.setPrototypeOf || {
+      __proto__: []
+    }
+    instanceof Array && function(d, b) {
+      d.__proto__ = b;
+    } || function(d, b) {
+      for (var p in b) {
+        if (b.hasOwnProperty(p)) d[p] = b[p];
+      }
+    };
+
+    return _extendStatics(d, b);
+  };
+
+  return function(d, b) {
+    _extendStatics(d, b);
+
+    function __() {
+      this.constructor = d;
+    }
+
+    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+  };
+}();
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.UnControlled = exports.Controlled = void 0;
+
+
+
+var SERVER_RENDERED = typeof navigator === 'undefined' || commonjsGlobal['PREVENT_CODEMIRROR_RENDER'] === true;
+var cm;
+
+if (!SERVER_RENDERED) {
+  cm = codemirror;
+}
+
+var Helper = function() {
+  function Helper() {}
+
+  Helper.equals = function(x, y) {
+    var _this = this;
+
+    var ok = Object.keys,
+      tx = _typeof(x),
+      ty = _typeof(y);
+
+    return x && y && tx === 'object' && tx === ty ? ok(x).length === ok(y).length && ok(x).every(function(key) {
+      return _this.equals(x[key], y[key]);
+    }) : x === y;
+  };
+
+  return Helper;
+}();
+
+var Shared = function() {
+  function Shared(editor, props) {
+    this.editor = editor;
+    this.props = props;
+  }
+
+  Shared.prototype.delegateCursor = function(position, scroll, focus) {
+    var doc = this.editor.getDoc();
+
+    if (focus) {
+      this.editor.focus();
+    }
+
+    scroll ? doc.setCursor(position) : doc.setCursor(position, null, {
+      scroll: false
+    });
+  };
+
+  Shared.prototype.delegateScroll = function(coordinates) {
+    this.editor.scrollTo(coordinates.x, coordinates.y);
+  };
+
+  Shared.prototype.delegateSelection = function(ranges, focus) {
+    var doc = this.editor.getDoc();
+    doc.setSelections(ranges);
+
+    if (focus) {
+      this.editor.focus();
+    }
+  };
+
+  Shared.prototype.apply = function(props) {
+    if (props && props.selection && props.selection.ranges) {
+      this.delegateSelection(props.selection.ranges, props.selection.focus || false);
+    }
+
+    if (props && props.cursor) {
+      this.delegateCursor(props.cursor, props.autoScroll || false, this.editor.getOption('autofocus') || false);
+    }
+
+    if (props && props.scroll) {
+      this.delegateScroll(props.scroll);
+    }
+  };
+
+  Shared.prototype.applyNext = function(props, next, preserved) {
+    if (props && props.selection && props.selection.ranges) {
+      if (next && next.selection && next.selection.ranges && !Helper.equals(props.selection.ranges, next.selection.ranges)) {
+        this.delegateSelection(next.selection.ranges, next.selection.focus || false);
+      }
+    }
+
+    if (props && props.cursor) {
+      if (next && next.cursor && !Helper.equals(props.cursor, next.cursor)) {
+        this.delegateCursor(preserved.cursor || next.cursor, next.autoScroll || false, next.autoCursor || false);
+      }
+    }
+
+    if (props && props.scroll) {
+      if (next && next.scroll && !Helper.equals(props.scroll, next.scroll)) {
+        this.delegateScroll(next.scroll);
+      }
+    }
+  };
+
+  Shared.prototype.applyUserDefined = function(props, preserved) {
+    if (preserved && preserved.cursor) {
+      this.delegateCursor(preserved.cursor, props.autoScroll || false, this.editor.getOption('autofocus') || false);
+    }
+  };
+
+  Shared.prototype.wire = function(props) {
+    var _this = this;
+
+    Object.keys(props || {}).filter(function(p) {
+      return /^on/.test(p);
+    }).forEach(function(prop) {
+      switch (prop) {
+        case 'onBlur': {
+          _this.editor.on('blur', function(cm, event) {
+            _this.props.onBlur(_this.editor, event);
+          });
+        }
+        break;
+
+      case 'onContextMenu': {
+        _this.editor.on('contextmenu', function(cm, event) {
+          _this.props.onContextMenu(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onCopy': {
+        _this.editor.on('copy', function(cm, event) {
+          _this.props.onCopy(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onCursor': {
+        _this.editor.on('cursorActivity', function(cm) {
+          _this.props.onCursor(_this.editor, _this.editor.getDoc().getCursor());
+        });
+      }
+      break;
+
+      case 'onCursorActivity': {
+        _this.editor.on('cursorActivity', function(cm) {
+          _this.props.onCursorActivity(_this.editor);
+        });
+      }
+      break;
+
+      case 'onCut': {
+        _this.editor.on('cut', function(cm, event) {
+          _this.props.onCut(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onDblClick': {
+        _this.editor.on('dblclick', function(cm, event) {
+          _this.props.onDblClick(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onDragEnter': {
+        _this.editor.on('dragenter', function(cm, event) {
+          _this.props.onDragEnter(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onDragLeave': {
+        _this.editor.on('dragleave', function(cm, event) {
+          _this.props.onDragLeave(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onDragOver': {
+        _this.editor.on('dragover', function(cm, event) {
+          _this.props.onDragOver(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onDragStart': {
+        _this.editor.on('dragstart', function(cm, event) {
+          _this.props.onDragStart(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onDrop': {
+        _this.editor.on('drop', function(cm, event) {
+          _this.props.onDrop(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onFocus': {
+        _this.editor.on('focus', function(cm, event) {
+          _this.props.onFocus(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onGutterClick': {
+        _this.editor.on('gutterClick', function(cm, lineNumber, gutter, event) {
+          _this.props.onGutterClick(_this.editor, lineNumber, gutter, event);
+        });
+      }
+      break;
+
+      case 'onInputRead': {
+        _this.editor.on('inputRead', function(cm, EditorChangeEvent) {
+          _this.props.onInputRead(_this.editor, EditorChangeEvent);
+        });
+      }
+      break;
+
+      case 'onKeyDown': {
+        _this.editor.on('keydown', function(cm, event) {
+          _this.props.onKeyDown(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onKeyHandled': {
+        _this.editor.on('keyHandled', function(cm, key, event) {
+          _this.props.onKeyHandled(_this.editor, key, event);
+        });
+      }
+      break;
+
+      case 'onKeyPress': {
+        _this.editor.on('keypress', function(cm, event) {
+          _this.props.onKeyPress(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onKeyUp': {
+        _this.editor.on('keyup', function(cm, event) {
+          _this.props.onKeyUp(_this.editor, event);
+        });
+      }
+      break;
+
+      case 'onMouseDown': {
+        _this.editor.on('mousedown', function(cm, event) {
+          _this.props.onMouseDown(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onPaste': {
+        _this.editor.on('paste', function(cm, event) {
+          _this.props.onPaste(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onRenderLine': {
+        _this.editor.on('renderLine', function(cm, line, element) {
+          _this.props.onRenderLine(_this.editor, line, element);
+        });
+
+        break;
+      }
+
+      case 'onScroll': {
+        _this.editor.on('scroll', function(cm) {
+          _this.props.onScroll(_this.editor, _this.editor.getScrollInfo());
+        });
+      }
+      break;
+
+      case 'onSelection': {
+        _this.editor.on('beforeSelectionChange', function(cm, data) {
+          _this.props.onSelection(_this.editor, data);
+        });
+      }
+      break;
+
+      case 'onTouchStart': {
+        _this.editor.on('touchstart', function(cm, event) {
+          _this.props.onTouchStart(_this.editor, event);
+        });
+
+        break;
+      }
+
+      case 'onUpdate': {
+        _this.editor.on('update', function(cm) {
+          _this.props.onUpdate(_this.editor);
+        });
+      }
+      break;
+
+      case 'onViewportChange': {
+        _this.editor.on('viewportChange', function(cm, from, to) {
+          _this.props.onViewportChange(_this.editor, from, to);
+        });
+      }
+      break;
+      }
+    });
+  };
+
+  return Shared;
+}();
+
+var Controlled = function(_super) {
+  __extends(Controlled, _super);
+
+  function Controlled(props) {
+    var _this = _super.call(this, props) || this;
+
+    if (SERVER_RENDERED) return _this;
+    _this.applied = false;
+    _this.appliedNext = false;
+    _this.appliedUserDefined = false;
+    _this.deferred = null;
+    _this.emulating = false;
+    _this.hydrated = false;
+
+    _this.initCb = function() {
+      if (_this.props.editorDidConfigure) {
+        _this.props.editorDidConfigure(_this.editor);
+      }
+    };
+
+    _this.mounted = false;
+    return _this;
+  }
+
+  Controlled.prototype.hydrate = function(props) {
+    var _this = this;
+
+    var _options = props && props.options ? props.options : {};
+
+    var userDefinedOptions = _extends({}, cm.defaults, this.editor.options, _options);
+
+    var optionDelta = Object.keys(userDefinedOptions).some(function(key) {
+      return _this.editor.getOption(key) !== userDefinedOptions[key];
+    });
+
+    if (optionDelta) {
+      Object.keys(userDefinedOptions).forEach(function(key) {
+        if (_options.hasOwnProperty(key)) {
+          if (_this.editor.getOption(key) !== userDefinedOptions[key]) {
+            _this.editor.setOption(key, userDefinedOptions[key]);
+
+            _this.mirror.setOption(key, userDefinedOptions[key]);
+          }
+        }
+      });
+    }
+
+    if (!this.hydrated) {
+      this.deferred ? this.resolveChange(props.value) : this.initChange(props.value || '');
+    }
+
+    this.hydrated = true;
+  };
+
+  Controlled.prototype.initChange = function(value) {
+    this.emulating = true;
+    var doc = this.editor.getDoc();
+    var lastLine = doc.lastLine();
+    var lastChar = doc.getLine(doc.lastLine()).length;
+    doc.replaceRange(value || '', {
+      line: 0,
+      ch: 0
+    }, {
+      line: lastLine,
+      ch: lastChar
+    });
+    this.mirror.setValue(value);
+    doc.clearHistory();
+    this.mirror.clearHistory();
+    this.emulating = false;
+  };
+
+  Controlled.prototype.resolveChange = function(value) {
+    this.emulating = true;
+    var doc = this.editor.getDoc();
+
+    if (this.deferred.origin === 'undo') {
+      doc.undo();
+    } else if (this.deferred.origin === 'redo') {
+      doc.redo();
+    } else {
+      doc.replaceRange(this.deferred.text, this.deferred.from, this.deferred.to, this.deferred.origin);
+    }
+
+    if (value && value !== doc.getValue()) {
+      var cursor = doc.getCursor();
+      doc.setValue(value);
+      doc.setCursor(cursor);
+    }
+
+    this.emulating = false;
+    this.deferred = null;
+  };
+
+  Controlled.prototype.mirrorChange = function(deferred) {
+    var doc = this.editor.getDoc();
+
+    if (deferred.origin === 'undo') {
+      doc.setHistory(this.mirror.getHistory());
+      this.mirror.undo();
+    } else if (deferred.origin === 'redo') {
+      doc.setHistory(this.mirror.getHistory());
+      this.mirror.redo();
+    } else {
+      this.mirror.replaceRange(deferred.text, deferred.from, deferred.to, deferred.origin);
+    }
+
+    return this.mirror.getValue();
+  };
+
+  Controlled.prototype.componentDidMount = function() {
+    var _this = this;
+
+    if (SERVER_RENDERED) return;
+
+    if (this.props.defineMode) {
+      if (this.props.defineMode.name && this.props.defineMode.fn) {
+        cm.defineMode(this.props.defineMode.name, this.props.defineMode.fn);
+      }
+    }
+
+    this.editor = cm(this.ref, this.props.options);
+    this.shared = new Shared(this.editor, this.props);
+    this.mirror = cm(function() {}, this.props.options);
+    this.editor.on('electricInput', function() {
+      _this.mirror.setHistory(_this.editor.getDoc().getHistory());
+    });
+    this.editor.on('cursorActivity', function() {
+      _this.mirror.setCursor(_this.editor.getDoc().getCursor());
+    });
+    this.editor.on('beforeChange', function(cm, data) {
+      if (_this.emulating) {
+        return;
+      }
+
+      data.cancel();
+      _this.deferred = data;
+
+      var phantomChange = _this.mirrorChange(_this.deferred);
+
+      if (_this.props.onBeforeChange) _this.props.onBeforeChange(_this.editor, _this.deferred, phantomChange);
+    });
+    this.editor.on('change', function(cm, data) {
+      if (!_this.mounted) {
+        return;
+      }
+
+      if (_this.props.onChange) {
+        _this.props.onChange(_this.editor, data, _this.editor.getValue());
+      }
+    });
+    this.hydrate(this.props);
+    this.shared.apply(this.props);
+    this.applied = true;
+    this.mounted = true;
+    this.shared.wire(this.props);
+
+    if (this.editor.getOption('autofocus')) {
+      this.editor.focus();
+    }
+
+    if (this.props.editorDidMount) {
+      this.props.editorDidMount(this.editor, this.editor.getValue(), this.initCb);
+    }
+  };
+
+  Controlled.prototype.componentDidUpdate = function(prevProps) {
+    if (SERVER_RENDERED) return;
+    var preserved = {
+      cursor: null
+    };
+
+    if (this.props.value !== prevProps.value) {
+      this.hydrated = false;
+    }
+
+    if (!this.props.autoCursor && this.props.autoCursor !== undefined) {
+      preserved.cursor = this.editor.getDoc().getCursor();
+    }
+
+    this.hydrate(this.props);
+
+    if (!this.appliedNext) {
+      this.shared.applyNext(prevProps, this.props, preserved);
+      this.appliedNext = true;
+    }
+
+    this.shared.applyUserDefined(prevProps, preserved);
+    this.appliedUserDefined = true;
+  };
+
+  Controlled.prototype.componentWillUnmount = function() {
+    if (SERVER_RENDERED) return;
+
+    if (this.props.editorWillUnmount) {
+      this.props.editorWillUnmount(cm);
+    }
+  };
+
+  Controlled.prototype.shouldComponentUpdate = function(nextProps, nextState) {
+    return !SERVER_RENDERED;
+  };
+
+  Controlled.prototype.render = function() {
+    var _this = this;
+
+    if (SERVER_RENDERED) return null;
+    var className = this.props.className ? 'react-codemirror2 ' + this.props.className : 'react-codemirror2';
+    return react.createElement('div', {
+      className: className,
+      ref: function ref(self) {
+        return _this.ref = self;
+      }
+    });
+  };
+
+  return Controlled;
+}(react.Component);
+
+exports.Controlled = Controlled;
+
+var UnControlled = function(_super) {
+  __extends(UnControlled, _super);
+
+  function UnControlled(props) {
+    var _this = _super.call(this, props) || this;
+
+    if (SERVER_RENDERED) return _this;
+    _this.applied = false;
+    _this.appliedUserDefined = false;
+    _this.continueChange = false;
+    _this.detached = false;
+    _this.hydrated = false;
+
+    _this.initCb = function() {
+      if (_this.props.editorDidConfigure) {
+        _this.props.editorDidConfigure(_this.editor);
+      }
+    };
+
+    _this.mounted = false;
+
+    _this.onBeforeChangeCb = function() {
+      _this.continueChange = true;
+    };
+
+    return _this;
+  }
+
+  UnControlled.prototype.hydrate = function(props) {
+    var _this = this;
+
+    var _options = props && props.options ? props.options : {};
+
+    var userDefinedOptions = _extends({}, cm.defaults, this.editor.options, _options);
+
+    var optionDelta = Object.keys(userDefinedOptions).some(function(key) {
+      return _this.editor.getOption(key) !== userDefinedOptions[key];
+    });
+
+    if (optionDelta) {
+      Object.keys(userDefinedOptions).forEach(function(key) {
+        if (_options.hasOwnProperty(key)) {
+          if (_this.editor.getOption(key) !== userDefinedOptions[key]) {
+            _this.editor.setOption(key, userDefinedOptions[key]);
+          }
+        }
+      });
+    }
+
+    if (!this.hydrated) {
+      var doc = this.editor.getDoc();
+      var lastLine = doc.lastLine();
+      var lastChar = doc.getLine(doc.lastLine()).length;
+      doc.replaceRange(props.value || '', {
+        line: 0,
+        ch: 0
+      }, {
+        line: lastLine,
+        ch: lastChar
+      });
+    }
+
+    this.hydrated = true;
+  };
+
+  UnControlled.prototype.componentDidMount = function() {
+    var _this = this;
+
+    if (SERVER_RENDERED) return;
+    this.detached = this.props.detach === true;
+
+    if (this.props.defineMode) {
+      if (this.props.defineMode.name && this.props.defineMode.fn) {
+        cm.defineMode(this.props.defineMode.name, this.props.defineMode.fn);
+      }
+    }
+
+    this.editor = cm(this.ref, this.props.options);
+    this.shared = new Shared(this.editor, this.props);
+    this.editor.on('beforeChange', function(cm, data) {
+      if (_this.props.onBeforeChange) {
+        _this.props.onBeforeChange(_this.editor, data, _this.editor.getValue(), _this.onBeforeChangeCb);
+      }
+    });
+    this.editor.on('change', function(cm, data) {
+      if (!_this.mounted || !_this.props.onChange) {
+        return;
+      }
+
+      if (_this.props.onBeforeChange) {
+        if (_this.continueChange) {
+          _this.props.onChange(_this.editor, data, _this.editor.getValue());
+        }
+      } else {
+        _this.props.onChange(_this.editor, data, _this.editor.getValue());
+      }
+    });
+    this.hydrate(this.props);
+    this.shared.apply(this.props);
+    this.applied = true;
+    this.mounted = true;
+    this.shared.wire(this.props);
+    this.editor.getDoc().clearHistory();
+
+    if (this.props.editorDidMount) {
+      this.props.editorDidMount(this.editor, this.editor.getValue(), this.initCb);
+    }
+  };
+
+  UnControlled.prototype.componentDidUpdate = function(prevProps) {
+    if (this.detached && this.props.detach === false) {
+      this.detached = false;
+
+      if (prevProps.editorDidAttach) {
+        prevProps.editorDidAttach(this.editor);
+      }
+    }
+
+    if (!this.detached && this.props.detach === true) {
+      this.detached = true;
+
+      if (prevProps.editorDidDetach) {
+        prevProps.editorDidDetach(this.editor);
+      }
+    }
+
+    if (SERVER_RENDERED || this.detached) return;
+    var preserved = {
+      cursor: null
+    };
+
+    if (this.props.value !== prevProps.value) {
+      this.hydrated = false;
+      this.applied = false;
+      this.appliedUserDefined = false;
+    }
+
+    if (!prevProps.autoCursor && prevProps.autoCursor !== undefined) {
+      preserved.cursor = this.editor.getDoc().getCursor();
+    }
+
+    this.hydrate(this.props);
+
+    if (!this.applied) {
+      this.shared.apply(prevProps);
+      this.applied = true;
+    }
+
+    if (!this.appliedUserDefined) {
+      this.shared.applyUserDefined(prevProps, preserved);
+      this.appliedUserDefined = true;
+    }
+  };
+
+  UnControlled.prototype.componentWillUnmount = function() {
+    if (SERVER_RENDERED) return;
+
+    if (this.props.editorWillUnmount) {
+      this.props.editorWillUnmount(cm);
+    }
+  };
+
+  UnControlled.prototype.shouldComponentUpdate = function(nextProps, nextState) {
+    var update = true;
+    if (SERVER_RENDERED) update = false;
+    if (this.detached && nextProps.detach) update = false;
+    return update;
+  };
+
+  UnControlled.prototype.render = function() {
+    var _this = this;
+
+    if (SERVER_RENDERED) return null;
+    var className = this.props.className ? 'react-codemirror2 ' + this.props.className : 'react-codemirror2';
+    return react.createElement('div', {
+      className: className,
+      ref: function ref(self) {
+        return _this.ref = self;
+      }
+    });
+  };
+
+  return UnControlled;
+}(react.Component);
+
+exports.UnControlled = UnControlled;
+});
+
+var Controlled = reactCodemirror2.Controlled;
+export { Controlled };
diff --git a/docs/_snowpack/pkg/react-dom.js b/docs/_snowpack/pkg/react-dom.js
index 9bf31488..2e6bea46 100644
--- a/docs/_snowpack/pkg/react-dom.js
+++ b/docs/_snowpack/pkg/react-dom.js
@@ -1,5 +1,5 @@
-import { c as createCommonjsModule } from './common/_commonjsHelpers-913f9c4a.js';
-import { r as react, o as objectAssign } from './common/index-c9e50cb4.js';
+import { c as createCommonjsModule } from './common/_commonjsHelpers-8c19dec8.js';
+import { r as react, o as objectAssign } from './common/index-04edb6a1.js';
 
 var scheduler_production_min = createCommonjsModule(function (module, exports) {
 var f,g,h,k;if("object"===typeof performance&&"function"===typeof performance.now){var l=performance;exports.unstable_now=function(){return l.now()};}else {var p=Date,q=p.now();exports.unstable_now=function(){return p.now()-q};}
diff --git a/docs/_snowpack/pkg/react.js b/docs/_snowpack/pkg/react.js
index 0a9aa3ff..45db9969 100644
--- a/docs/_snowpack/pkg/react.js
+++ b/docs/_snowpack/pkg/react.js
@@ -1,6 +1,6 @@
-import { r as react } from './common/index-c9e50cb4.js';
-export { r as default } from './common/index-c9e50cb4.js';
-import './common/_commonjsHelpers-913f9c4a.js';
+import { r as react } from './common/index-04edb6a1.js';
+export { r as default } from './common/index-04edb6a1.js';
+import './common/_commonjsHelpers-8c19dec8.js';
 
 
 
diff --git a/docs/dist/App.js b/docs/dist/App.js
index 4284e687..86d580ab 100644
--- a/docs/dist/App.js
+++ b/docs/dist/App.js
@@ -4,14 +4,13 @@ import * as strudel from "../_snowpack/link/strudel.js";
 import cx from "./cx.js";
 import * as Tone from "../_snowpack/pkg/tone.js";
 import useCycle from "./useCycle.js";
-import {tetris} from "./tunes.js";
-const {Fraction, TimeSpan} = strudel;
-const fr = (v) => new Fraction(v);
-const ts = (start, end) => new TimeSpan(fr(start), fr(end));
-const parse = (code) => {
-  const {sequence, pure, reify, slowcat, fastcat, cat, stack, silence} = strudel;
-  return eval(code);
-};
+import * as tunes from "./tunes.js";
+import * as krill from "./parse.js";
+import CodeMirror from "./CodeMirror.js";
+const {tetris, tetrisMini, tetrisHaskell} = tunes;
+const {sequence, pure, reify, slowcat, fastcat, cat, stack, silence} = strudel;
+const {mini, h} = krill;
+const parse = (code) => eval(code);
 const synth = new Tone.PolySynth().toDestination();
 synth.set({
   oscillator: {type: "triangle"},
@@ -20,7 +19,8 @@ synth.set({
   }
 });
 function App() {
-  const [code, setCode] = useState(tetris);
+  const [mode, setMode] = useState("javascript");
+  const [code, setCode] = useState(tetrisHaskell);
   const [log, setLog] = useState("");
   const logBox = useRef();
   const [error, setError] = useState();
@@ -50,10 +50,18 @@ function App() {
   });
   useEffect(() => {
     try {
-      const _pattern = parse(code);
+      let _pattern;
+      try {
+        _pattern = h(code);
+        setMode("pegjs");
+      } catch (err) {
+        setMode("javascript");
+        _pattern = parse(code);
+      }
       setPattern(_pattern);
       setError(void 0);
     } catch (err) {
+      console.warn(err);
       setError(err);
     }
   }, [code]);
@@ -61,9 +69,9 @@ function App() {
     logBox.current.scrollTop = logBox.current?.scrollHeight;
   }, [log]);
   return /* @__PURE__ */ React.createElement("div", {
-    className: "h-[100vh] bg-slate-900 flex-row"
+    className: "h-screen bg-slate-900 flex flex-col"
   }, /* @__PURE__ */ React.createElement("header", {
-    className: "px-2 flex items-center space-x-2 border-b border-gray-200 bg-white"
+    className: "flex-none w-full h-16 px-2 flex items-center space-x-2 border-b border-gray-200 bg-white"
   }, /* @__PURE__ */ React.createElement("img", {
     src: logo,
     className: "Tidal-logo w-16 h-16",
@@ -71,29 +79,35 @@ function App() {
   }), /* @__PURE__ */ React.createElement("h1", {
     className: "text-2xl"
   }, "Strudel REPL")), /* @__PURE__ */ React.createElement("section", {
-    className: "grow p-2 text-gray-100"
+    className: "grow flex flex-col p-2 text-gray-100"
   }, /* @__PURE__ */ React.createElement("div", {
-    className: "relative"
+    className: "grow relative"
   }, /* @__PURE__ */ React.createElement("div", {
-    className: "absolute right-2 bottom-2 text-red-500"
-  }, error?.message), /* @__PURE__ */ React.createElement("textarea", {
-    className: cx("w-full h-64 bg-slate-600", error ? "focus:ring-red-500" : "focus:ring-slate-800"),
+    className: cx("h-full bg-slate-600", error ? "focus:ring-red-500" : "focus:ring-slate-800")
+  }, /* @__PURE__ */ React.createElement(CodeMirror, {
     value: code,
-    onChange: (e) => {
+    options: {
+      mode,
+      theme: "material",
+      lineNumbers: true
+    },
+    onChange: (_, __, value) => {
       setLog((log2) => log2 + `${log2 ? "\n\n" : ""}✏️ edit
 ${code}
-${e.target.value}`);
-      setCode(e.target.value);
+${value}`);
+      setCode(value);
     }
-  })), /* @__PURE__ */ React.createElement("textarea", {
-    className: "w-full h-64 bg-slate-600",
+  })), error && /* @__PURE__ */ React.createElement("div", {
+    className: "absolute right-2 bottom-2 text-red-500"
+  }, error?.message || "unknown error")), /* @__PURE__ */ React.createElement("button", {
+    className: "flex-none w-full border border-gray-700 p-2 bg-slate-700 hover:bg-slate-500",
+    onClick: () => cycle.toggle()
+  }, cycle.started ? "pause" : "play"), /* @__PURE__ */ React.createElement("textarea", {
+    className: "grow bg-[#283237] border-0",
     value: log,
     readOnly: true,
     ref: logBox,
     style: {fontFamily: "monospace"}
-  }), /* @__PURE__ */ React.createElement("button", {
-    className: "w-full border border-gray-700 p-2 bg-slate-700 hover:bg-slate-500",
-    onClick: () => cycle.toggle()
-  }, cycle.started ? "pause" : "play")));
+  })));
 }
 export default App;
diff --git a/docs/dist/CodeMirror.js b/docs/dist/CodeMirror.js
new file mode 100644
index 00000000..1b7734b1
--- /dev/null
+++ b/docs/dist/CodeMirror.js
@@ -0,0 +1,18 @@
+import React from "../_snowpack/pkg/react.js";
+import {Controlled as CodeMirror2} from "../_snowpack/pkg/react-codemirror2.js";
+import "../_snowpack/pkg/codemirror/mode/javascript/javascript.js";
+import "../_snowpack/pkg/codemirror/mode/pegjs/pegjs.js";
+import "../_snowpack/pkg/codemirror/theme/material.css.proxy.js";
+import "../_snowpack/pkg/codemirror/lib/codemirror.css.proxy.js";
+export default function CodeMirror({value, onChange, options}) {
+  options = options || {
+    mode: "javascript",
+    theme: "material",
+    lineNumbers: true
+  };
+  return /* @__PURE__ */ React.createElement(CodeMirror2, {
+    value,
+    options,
+    onBeforeChange: onChange
+  });
+}
diff --git a/docs/dist/logo.svg.proxy.js b/docs/dist/logo.svg.proxy.js
index aed9da04..73f6fe7f 100644
--- a/docs/dist/logo.svg.proxy.js
+++ b/docs/dist/logo.svg.proxy.js
@@ -1 +1 @@
-export default "/dist/logo.svg";
\ No newline at end of file
+export default "/strudel/dist/logo.svg";
\ No newline at end of file
diff --git a/docs/dist/parse.js b/docs/dist/parse.js
new file mode 100644
index 00000000..3329c590
--- /dev/null
+++ b/docs/dist/parse.js
@@ -0,0 +1,80 @@
+import * as krill from "../_snowpack/link/repl/krill-parser.js";
+import * as strudel from "../_snowpack/link/strudel.js";
+import {Scale, Note, Interval} from "../_snowpack/pkg/@tonaljs/tonal.js";
+const {sequence, stack, silence, Fraction, pure} = strudel;
+function reify(thing) {
+  if (thing?.constructor?.name === "Pattern") {
+    return thing;
+  }
+  return pure(thing);
+}
+const applyOptions = (parent) => (pat, i) => {
+  const ast = parent.source_[i];
+  const options = ast.options_;
+  const operator = options?.operator;
+  if (operator) {
+    switch (operator.type_) {
+      case "stretch":
+        const speed = new Fraction(operator.arguments_.amount).inverse().valueOf();
+        return reify(pat).fast(speed);
+    }
+    console.warn(`operator "${operator.type_}" not implemented`);
+  }
+  const unimplemented = Object.keys(options || {}).filter((key) => key !== "operator");
+  if (unimplemented.length) {
+    console.warn(`option${unimplemented.length > 1 ? "s" : ""} ${unimplemented.map((o) => `"${o}"`).join(", ")} not implemented`);
+  }
+  return pat;
+};
+export function patternifyAST(ast) {
+  switch (ast.type_) {
+    case "pattern":
+      const children = ast.source_.map(patternifyAST).map(applyOptions(ast));
+      if (ast.arguments_.alignment === "v") {
+        return stack(...children);
+      }
+      return sequence(...children);
+    case "element":
+      if (ast.source_ === "~") {
+        return silence;
+      }
+      if (typeof ast.source_ !== "object") {
+        return ast.source_;
+      }
+      return patternifyAST(ast.source_);
+    case "stretch":
+      return patternifyAST(ast.source_).slow(ast.arguments_.amount);
+    case "scale":
+      let [tonic, scale] = Scale.tokenize(ast.arguments_.scale);
+      const intervals = Scale.get(scale).intervals;
+      const pattern = patternifyAST(ast.source_);
+      tonic = tonic || "C4";
+      console.log("tonic", tonic);
+      return pattern.fmap((step) => {
+        step = Number(step);
+        if (isNaN(step)) {
+          console.warn(`scale step "${step}" not a number`);
+          return step;
+        }
+        const octaves = Math.floor(step / intervals.length);
+        const mod = (n, m) => n < 0 ? mod(n + m, m) : n % m;
+        const index = mod(step, intervals.length);
+        const interval = Interval.add(intervals[index], Interval.fromSemitones(octaves * 12));
+        return Note.transpose(tonic, interval || "1P");
+      });
+    default:
+      console.warn(`node type "${ast.type_}" not implemented -> returning silence`);
+      return silence;
+  }
+}
+export const mini = (...strings) => {
+  const pattern = sequence(...strings.map((str) => {
+    const ast = krill.parse(`"${str}"`);
+    return patternifyAST(ast);
+  }));
+  return pattern;
+};
+export const h = (string) => {
+  const ast = krill.parse(string);
+  return patternifyAST(ast);
+};
diff --git a/docs/dist/tunes.js b/docs/dist/tunes.js
index 3e9dd75d..6ce65d8c 100644
--- a/docs/dist/tunes.js
+++ b/docs/dist/tunes.js
@@ -1,4 +1,4 @@
-export const tetris = `stack(sequence(
+export const tetrisWithFunctions = `stack(sequence(
   'e5', sequence('b4', 'c5'), 'd5', sequence('c5', 'b4'),
   'a4', sequence('a4', 'c5'), 'e5', sequence('d5', 'c5'),
   'b4', sequence(silence, 'c5'), 'd5', 'e5',
@@ -18,6 +18,84 @@ export const tetris = `stack(sequence(
     'a1', 'a2', 'a1', 'a2', 'a1', 'a2', 'a1', 'a2',
   )
 )._slow(16)`;
+export const tetris = `stack(
+  sequence(
+    mini(
+      'e5 [b4 c5] d5 [c5 b4]',
+      'a4 [a4 c5] e5 [d5 c5]',
+      'b4 [~ c5] d5 e5',
+      'c5 a4 a4 ~',
+      '[~ d5] [~ f5] a5 [g5 f5]',
+      'e5 [~ c5] e5 [d5 c5]',
+      'b4 [b4 c5] d5 e5',
+      'c5 a4 a4 ~'
+    )
+  ),
+  sequence(
+    mini(
+      'e2 e3 e2 e3 e2 e3 e2 e3',
+      'a2 a3 a2 a3 a2 a3 a2 a3',
+      'g#2 g#3 g#2 g#3 e2 e3 e2 e3',
+      'a2 a3 a2 a3 a2 a3 b1 c2',
+      'd2 d3 d2 d3 d2 d3 d2 d3',
+      'c2 c3 c2 c3 c2 c3 c2 c3',
+      'b1 b2 b1 b2 e2 e3 e2 e3',
+      'a1 a2 a1 a2 a1 a2 a1 a2'
+    )
+  )
+)._slow(16);`;
+export const tetrisMini1 = `mini('[[e5 [b4 c5] d5 [c5 b4]] [a4 [a4 c5] e5 [d5 c5]] [b4 [~ c5] d5 e5] [c5 a4 a4 ~] [[~ d5] [~ f5] a5 [g5 f5]] [e5 [~ c5] e5 [d5 c5]] [b4 [b4 c5] d5 e5] [c5 a4 a4 ~]],[[e2 e3 e2 e3 e2 e3 e2 e3] [a2 a3 a2 a3 a2 a3 a2 a3] [g#2 g#3 g#2 g#3 e2 e3 e2 e3] [a2 a3 a2 a3 a2 a3 b1 c2] [d2 d3 d2 d3 d2 d3 d2 d3] [c2 c3 c2 c3 c2 c3 c2 c3] [b1 b2 b1 b2 e2 e3 e2 e3] [a1 a2 a1 a2 a1 a2 a1 a2]]')._slow(16);`;
+export const tetrisMini = `mini(\`[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]\`)._slow(16);
+`;
+export const tetrisHaskellH = `h(\`slow 16 $ "[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]"\`)
+`;
+export const tetrisHaskell = `slow 16 $ "[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]"
+`;
 export const spanish = `slowcat(
       stack('c4','eb4','g4'),
       stack('bb3','d4','f4'),
diff --git a/docs/dist/useCycle.js b/docs/dist/useCycle.js
index 68eeb90d..3fd48ffc 100644
--- a/docs/dist/useCycle.js
+++ b/docs/dist/useCycle.js
@@ -25,11 +25,11 @@ function useCycle(props) {
         query(cycle + 1);
       }, queryNextTime);
     }
-    events?.forEach((event) => {
+    events?.filter((event) => event.part.begin.valueOf() === event.whole.begin.valueOf()).forEach((event) => {
       Tone.Transport.schedule((time) => {
         const toneEvent = {
           time: event.part.begin.valueOf(),
-          duration: event.part.end.valueOf() - event.part.begin.valueOf(),
+          duration: event.whole.end.valueOf() - event.whole.begin.valueOf(),
           value: event.value
         };
         onEvent(time, toneEvent);
diff --git a/docs/global.css b/docs/global.css
index f11c005c..bd469464 100644
--- a/docs/global.css
+++ b/docs/global.css
@@ -605,26 +605,32 @@ select {
 .flex {
   display: flex;
 }
-.h-\[100vh\] {
+.h-screen {
   height: 100vh;
 }
 .h-16 {
   height: 4rem;
 }
+.h-full {
+  height: 100%;
+}
 .h-64 {
   height: 16rem;
 }
-.w-16 {
-  width: 4rem;
-}
 .w-full {
   width: 100%;
 }
+.w-16 {
+  width: 4rem;
+}
+.flex-none {
+  flex: none;
+}
 .grow {
   flex-grow: 1;
 }
-.flex-row {
-  flex-direction: row;
+.flex-col {
+  flex-direction: column;
 }
 .items-center {
   align-items: center;
@@ -637,6 +643,9 @@ select {
 .border {
   border-width: 1px;
 }
+.border-0 {
+  border-width: 0px;
+}
 .border-b {
   border-bottom-width: 1px;
 }
@@ -664,6 +673,10 @@ select {
   --tw-bg-opacity: 1;
   background-color: rgb(51 65 85 / var(--tw-bg-opacity));
 }
+.bg-\[\#283237\] {
+  --tw-bg-opacity: 1;
+  background-color: rgb(40 50 55 / var(--tw-bg-opacity));
+}
 .p-2 {
   padding: 0.5rem;
 }
@@ -686,14 +699,22 @@ select {
 .filter {
   filter: var(--tw-blur) var(--tw-brightness) var(--tw-contrast) var(--tw-grayscale) var(--tw-hue-rotate) var(--tw-invert) var(--tw-saturate) var(--tw-sepia) var(--tw-drop-shadow);
 }
+
+.react-codemirror2,
+.CodeMirror {
+  height: 100% !important;
+}
+
 .hover\:bg-slate-500:hover {
   --tw-bg-opacity: 1;
   background-color: rgb(100 116 139 / var(--tw-bg-opacity));
 }
+
 .focus\:ring-red-500:focus {
   --tw-ring-opacity: 1;
   --tw-ring-color: rgb(239 68 68 / var(--tw-ring-opacity));
 }
+
 .focus\:ring-slate-800:focus {
   --tw-ring-opacity: 1;
   --tw-ring-color: rgb(30 41 59 / var(--tw-ring-opacity));
diff --git a/docs/index.html b/docs/index.html
index 0e7db17b..507724ce 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -2,8 +2,8 @@
 <html lang="en">
   <head>
     <meta charset="utf-8" />
-    <link rel="icon" href="/favicon.ico" />
-    <link rel="stylesheet" type="text/css" href="/global.css" />
+    <link rel="icon" href="/strudel/favicon.ico" />
+    <link rel="stylesheet" type="text/css" href="/strudel/global.css" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="description" content="Strudel REPL" />
     <title>Strudel REPL</title>
@@ -11,6 +11,6 @@
   <body>
     <div id="root"></div>
     <noscript>You need to enable JavaScript to run this app.</noscript>
-    <script type="module" src="/dist/index.js"></script>
+    <script type="module" src="/strudel/dist/index.js"></script>
   </body>
 </html>
diff --git a/package-lock.json b/package-lock.json
index d0883aed..ff7539db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,25 +1,26 @@
 {
-  "name": "strudel",
-  "version": "1.0.0",
+  "name": "tidal-strudel",
+  "version": "1.0.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "strudel",
-      "version": "1.0.0",
+      "name": "tidal-strudel",
+      "version": "1.0.2",
       "license": "GPL-3.0-or-later",
       "dependencies": {
-        "snowpack": "^3.8.8"
+        "fraction.js": "^4.1.2"
       },
       "devDependencies": {
-        "fraction.js": "^4.1.2",
-        "mocha": "^9.1.4"
+        "mocha": "^9.1.4",
+        "snowpack": "^3.8.8"
       }
     },
     "node_modules/@babel/code-frame": {
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
       "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
+      "dev": true,
       "dependencies": {
         "@babel/highlight": "^7.16.7"
       },
@@ -31,6 +32,7 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
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+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
         },
         "strip-ansi": {
           "version": "3.0.1",
           "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
           "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -7555,6 +8310,7 @@
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
       "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
       "requires": {
         "ansi-regex": "^5.0.1"
       }
@@ -7562,12 +8318,14 @@
     "strip-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-comments/-/strip-comments-2.0.1.tgz",
-      "integrity": "sha512-ZprKx+bBLXv067WTCALv8SSz5l2+XhpYCsVtSqlMnkAXMWDq+/ekVbl1ghqP9rUHTzv6sm/DwCOiYutU/yp1fw=="
+      "integrity": "sha512-ZprKx+bBLXv067WTCALv8SSz5l2+XhpYCsVtSqlMnkAXMWDq+/ekVbl1ghqP9rUHTzv6sm/DwCOiYutU/yp1fw==",
+      "dev": true
     },
     "strip-final-newline": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
-      "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA=="
+      "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
+      "dev": true
     },
     "strip-json-comments": {
       "version": "3.1.1",
@@ -7587,12 +8345,14 @@
     "supports-preserve-symlinks-flag": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
-      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w=="
+      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+      "dev": true
     },
     "tar": {
       "version": "6.1.11",
       "resolved": "https://registry.npmjs.org/tar/-/tar-6.1.11.tgz",
       "integrity": "sha512-an/KZQzQUkZCkuoAA64hM92X0Urb6VpRhAFllDzz44U2mcD5scmT3zBc4VgVpkugF580+DQn8eAFSyoQt0tznA==",
+      "dev": true,
       "requires": {
         "chownr": "^2.0.0",
         "fs-minipass": "^2.0.0",
@@ -7606,6 +8366,7 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
       "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "dev": true,
       "requires": {
         "is-number": "^7.0.0"
       }
@@ -7614,6 +8375,7 @@
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
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+      "dev": true,
       "requires": {
         "psl": "^1.1.28",
         "punycode": "^2.1.1"
@@ -7622,17 +8384,20 @@
     "treeverse": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/treeverse/-/treeverse-1.0.4.tgz",
-      "integrity": "sha512-whw60l7r+8ZU8Tu/Uc2yxtc4ZTZbR/PF3u1IPNKGQ6p8EICLb3Z2lAgoqw9bqYd8IkgnsaOcLzYHFckjqNsf0g=="
+      "integrity": "sha512-whw60l7r+8ZU8Tu/Uc2yxtc4ZTZbR/PF3u1IPNKGQ6p8EICLb3Z2lAgoqw9bqYd8IkgnsaOcLzYHFckjqNsf0g==",
+      "dev": true
     },
     "tslib": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.1.tgz",
-      "integrity": "sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw=="
+      "integrity": "sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==",
+      "dev": true
     },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
       "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
       "requires": {
         "safe-buffer": "^5.0.1"
       }
@@ -7640,12 +8405,14 @@
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
     },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
       "integrity": "sha512-zdu8XMNEDepKKR+XYOXAVPtWui0ly0NtohUscw+UmaHiAWT8hrV1rr//H6V+0DvJ3OQ19S979M0laLfX8rm82Q==",
+      "dev": true,
       "requires": {
         "is-typedarray": "^1.0.0"
       }
@@ -7654,6 +8421,7 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.1.tgz",
       "integrity": "sha512-Vmp0jIp2ln35UTXuryvjzkjGdRyf9b2lTXuSYUiPmzRcl3FDtYqAwOnTJkAngD9SWhnoJzDbTKwaOrZ+STtxNQ==",
+      "dev": true,
       "requires": {
         "unique-slug": "^2.0.0"
       }
@@ -7662,6 +8430,7 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.2.tgz",
       "integrity": "sha512-zoWr9ObaxALD3DOPfjPSqxt4fnZiWblxHIgeWqW8x7UqDzEtHEQLzji2cuJYQFCU6KmoJikOYAZlrTHHebjx2w==",
+      "dev": true,
       "requires": {
         "imurmurhash": "^0.1.4"
       }
@@ -7670,6 +8439,7 @@
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/untildify/-/untildify-2.1.0.tgz",
       "integrity": "sha1-F+soB5h/dpUunASF/DEdBqgmouA=",
+      "dev": true,
       "requires": {
         "os-homedir": "^1.0.0"
       }
@@ -7678,6 +8448,7 @@
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
       "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
       "requires": {
         "punycode": "^2.1.0"
       }
@@ -7686,6 +8457,7 @@
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.8.tgz",
       "integrity": "sha512-k4dW/Qja1BYDl2qD4tOMB9PFVha/UJtxTc1cXYOe3WwA/2m0Yn4qB7wLMpJyLJ/7DR0XnTut3HsCSzDT4ZvKgA==",
+      "dev": true,
       "requires": {
         "node-gyp-build": "^4.3.0"
       }
@@ -7694,6 +8466,7 @@
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
       "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+      "dev": true,
       "requires": {
         "inherits": "2.0.1"
       },
@@ -7701,24 +8474,28 @@
         "inherits": {
           "version": "2.0.1",
           "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
-          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE="
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
+          "dev": true
         }
       }
     },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
     },
     "uuid": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
-      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
+      "dev": true
     },
     "validate-npm-package-name": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-3.0.0.tgz",
       "integrity": "sha1-X6kS2B630MdK/BQN5zF/DKffQ34=",
+      "dev": true,
       "requires": {
         "builtins": "^1.0.3"
       }
@@ -7727,6 +8504,7 @@
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
       "requires": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
@@ -7736,24 +8514,28 @@
         "core-util-is": {
           "version": "1.0.2",
           "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+          "dev": true
         }
       }
     },
     "vm2": {
       "version": "3.9.5",
       "resolved": "https://registry.npmjs.org/vm2/-/vm2-3.9.5.tgz",
-      "integrity": "sha512-LuCAHZN75H9tdrAiLFf030oW7nJV5xwNMuk1ymOZwopmuK3d2H4L1Kv4+GFHgarKiLfXXLFU+7LDABHnwOkWng=="
+      "integrity": "sha512-LuCAHZN75H9tdrAiLFf030oW7nJV5xwNMuk1ymOZwopmuK3d2H4L1Kv4+GFHgarKiLfXXLFU+7LDABHnwOkWng==",
+      "dev": true
     },
     "walk-up-path": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/walk-up-path/-/walk-up-path-1.0.0.tgz",
-      "integrity": "sha512-hwj/qMDUEjCU5h0xr90KGCf0tg0/LgJbmOWgrWKYlcJZM7XvquvUJZ0G/HMGr7F7OQMOUuPHWP9JpriinkAlkg=="
+      "integrity": "sha512-hwj/qMDUEjCU5h0xr90KGCf0tg0/LgJbmOWgrWKYlcJZM7XvquvUJZ0G/HMGr7F7OQMOUuPHWP9JpriinkAlkg==",
+      "dev": true
     },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
@@ -7762,6 +8544,7 @@
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
       "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
+      "dev": true,
       "requires": {
         "string-width": "^1.0.2 || 2 || 3 || 4"
       }
@@ -7805,12 +8588,14 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "write-file-atomic": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
       "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
       "requires": {
         "imurmurhash": "^0.1.4",
         "is-typedarray": "^1.0.0",
@@ -7822,6 +8607,7 @@
       "version": "7.5.6",
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.6.tgz",
       "integrity": "sha512-6GLgCqo2cy2A2rjCNFlxQS6ZljG/coZfZXclldI8FB/1G3CCI36Zd8xy2HrFVACi8tfk5XrgLQEk+P0Tnz9UcA==",
+      "dev": true,
       "requires": {}
     },
     "y18n": {
@@ -7833,12 +8619,14 @@
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
     },
     "yaml": {
       "version": "1.10.2",
       "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.2.tgz",
-      "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg=="
+      "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg==",
+      "dev": true
     },
     "yargs": {
       "version": "16.2.0",
@@ -7877,7 +8665,8 @@
     "yargs-parser": {
       "version": "20.2.4",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.4.tgz",
-      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA=="
+      "integrity": "sha512-WOkpgNhPTlE73h4VFAFsOnomJVaovO8VqLDzy5saChRBFQFBoMYirowyW+Q9HB4HFF4Z7VZTiG3iSzJJA29yRA==",
+      "dev": true
     },
     "yargs-unparser": {
       "version": "2.0.0",
@@ -7894,7 +8683,8 @@
     "yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
-      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true
     }
   }
 }
diff --git a/repl/README.md b/repl/README.md
index 26408bc1..db8fde66 100644
--- a/repl/README.md
+++ b/repl/README.md
@@ -1,5 +1,18 @@
 # Strudel REPL
 
+## TODO
+
+### mini notation ([krill docs](https://github.com/Mdashdotdashn/krill#general-principles))
+
+- "@" aka elongation / weight: how to write in strudel?
+- "%" fixed step: how to write in strudel?
+- "struct" not sure how to do this
+- "c3(5,8)" bjorklund algorithm
+- more [mini notation features](https://tidalcycles.org/docs/patternlib/tutorials/mini_notation)
+- not tested
+
+## Default Snowpack Readme
+
 > ✨ Bootstrapped with Create Snowpack App (CSA).
 
 ## Available Scripts
@@ -14,12 +27,7 @@ You will also see any lint errors in the console.
 
 ### npm run build
 
-Builds a static copy of your site to the `build/` folder.
+Builds a static copy of your site to the `docs/` folder.
 Your app is ready to be deployed!
 
 **For the best production performance:** Add a build bundler plugin like "@snowpack/plugin-webpack" to your `snowpack.config.mjs` config file.
-
-### npm test
-
-Launches the application test runner.
-Run with the `--watch` flag (`npm test -- --watch`) to run in interactive watch mode.
diff --git a/repl/krill-parser.js b/repl/krill-parser.js
new file mode 100644
index 00000000..db17b13f
--- /dev/null
+++ b/repl/krill-parser.js
@@ -0,0 +1,1916 @@
+// Generated by Peggy 1.2.0.
+//
+// https://peggyjs.org/
+
+function peg$subclass(child, parent) {
+  function C() { this.constructor = child; }
+  C.prototype = parent.prototype;
+  child.prototype = new C();
+}
+
+function peg$SyntaxError(message, expected, found, location) {
+  var self = Error.call(this, message);
+  if (Object.setPrototypeOf) {
+    Object.setPrototypeOf(self, peg$SyntaxError.prototype);
+  }
+  self.expected = expected;
+  self.found = found;
+  self.location = location;
+  self.name = "SyntaxError";
+  return self;
+}
+
+peg$subclass(peg$SyntaxError, Error);
+
+function peg$padEnd(str, targetLength, padString) {
+  padString = padString || " ";
+  if (str.length > targetLength) { return str; }
+  targetLength -= str.length;
+  padString += padString.repeat(targetLength);
+  return str + padString.slice(0, targetLength);
+}
+
+peg$SyntaxError.prototype.format = function(sources) {
+  var str = "Error: " + this.message;
+  if (this.location) {
+    var src = null;
+    var k;
+    for (k = 0; k < sources.length; k++) {
+      if (sources[k].source === this.location.source) {
+        src = sources[k].text.split(/\r\n|\n|\r/g);
+        break;
+      }
+    }
+    var s = this.location.start;
+    var loc = this.location.source + ":" + s.line + ":" + s.column;
+    if (src) {
+      var e = this.location.end;
+      var filler = peg$padEnd("", s.line.toString().length);
+      var line = src[s.line - 1];
+      var last = s.line === e.line ? e.column : line.length + 1;
+      str += "\n --> " + loc + "\n"
+          + filler + " |\n"
+          + s.line + " | " + line + "\n"
+          + filler + " | " + peg$padEnd("", s.column - 1)
+          + peg$padEnd("", last - s.column, "^");
+    } else {
+      str += "\n at " + loc;
+    }
+  }
+  return str;
+};
+
+peg$SyntaxError.buildMessage = function(expected, found) {
+  var DESCRIBE_EXPECTATION_FNS = {
+    literal: function(expectation) {
+      return "\"" + literalEscape(expectation.text) + "\"";
+    },
+
+    class: function(expectation) {
+      var escapedParts = expectation.parts.map(function(part) {
+        return Array.isArray(part)
+          ? classEscape(part[0]) + "-" + classEscape(part[1])
+          : classEscape(part);
+      });
+
+      return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+    },
+
+    any: function() {
+      return "any character";
+    },
+
+    end: function() {
+      return "end of input";
+    },
+
+    other: function(expectation) {
+      return expectation.description;
+    }
+  };
+
+  function hex(ch) {
+    return ch.charCodeAt(0).toString(16).toUpperCase();
+  }
+
+  function literalEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/"/g,  "\\\"")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function classEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/\]/g, "\\]")
+      .replace(/\^/g, "\\^")
+      .replace(/-/g,  "\\-")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function describeExpectation(expectation) {
+    return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+  }
+
+  function describeExpected(expected) {
+    var descriptions = expected.map(describeExpectation);
+    var i, j;
+
+    descriptions.sort();
+
+    if (descriptions.length > 0) {
+      for (i = 1, j = 1; i < descriptions.length; i++) {
+        if (descriptions[i - 1] !== descriptions[i]) {
+          descriptions[j] = descriptions[i];
+          j++;
+        }
+      }
+      descriptions.length = j;
+    }
+
+    switch (descriptions.length) {
+      case 1:
+        return descriptions[0];
+
+      case 2:
+        return descriptions[0] + " or " + descriptions[1];
+
+      default:
+        return descriptions.slice(0, -1).join(", ")
+          + ", or "
+          + descriptions[descriptions.length - 1];
+    }
+  }
+
+  function describeFound(found) {
+    return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+  }
+
+  return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+};
+
+function peg$parse(input, options) {
+  options = options !== undefined ? options : {};
+
+  var peg$FAILED = {};
+  var peg$source = options.grammarSource;
+
+  var peg$startRuleFunctions = { start: peg$parsestart };
+  var peg$startRuleFunction = peg$parsestart;
+
+  var peg$c0 = ".";
+  var peg$c1 = "-";
+  var peg$c2 = "+";
+  var peg$c3 = "0";
+  var peg$c4 = ",";
+  var peg$c5 = "\"";
+  var peg$c6 = "'";
+  var peg$c7 = "#";
+  var peg$c8 = "[";
+  var peg$c9 = "]";
+  var peg$c10 = "<";
+  var peg$c11 = ">";
+  var peg$c12 = "@";
+  var peg$c13 = "(";
+  var peg$c14 = ")";
+  var peg$c15 = "/";
+  var peg$c16 = "*";
+  var peg$c17 = "%";
+  var peg$c18 = "struct";
+  var peg$c19 = "target";
+  var peg$c20 = "euclid";
+  var peg$c21 = "slow";
+  var peg$c22 = "rotL";
+  var peg$c23 = "rotR";
+  var peg$c24 = "fast";
+  var peg$c25 = "scale";
+  var peg$c26 = "//";
+  var peg$c27 = "cat";
+  var peg$c28 = "$";
+  var peg$c29 = "setcps";
+  var peg$c30 = "setbpm";
+  var peg$c31 = "hush";
+
+  var peg$r0 = /^[1-9]/;
+  var peg$r1 = /^[eE]/;
+  var peg$r2 = /^[0-9]/;
+  var peg$r3 = /^[ \n\r\t]/;
+  var peg$r4 = /^[0-9a-zA-Z~]/;
+  var peg$r5 = /^[^\n]/;
+
+  var peg$e0 = peg$otherExpectation("number");
+  var peg$e1 = peg$literalExpectation(".", false);
+  var peg$e2 = peg$classExpectation([["1", "9"]], false, false);
+  var peg$e3 = peg$classExpectation(["e", "E"], false, false);
+  var peg$e4 = peg$literalExpectation("-", false);
+  var peg$e5 = peg$literalExpectation("+", false);
+  var peg$e6 = peg$literalExpectation("0", false);
+  var peg$e7 = peg$classExpectation([["0", "9"]], false, false);
+  var peg$e8 = peg$otherExpectation("whitespace");
+  var peg$e9 = peg$classExpectation([" ", "\n", "\r", "\t"], false, false);
+  var peg$e10 = peg$literalExpectation(",", false);
+  var peg$e11 = peg$literalExpectation("\"", false);
+  var peg$e12 = peg$literalExpectation("'", false);
+  var peg$e13 = peg$classExpectation([["0", "9"], ["a", "z"], ["A", "Z"], "~"], false, false);
+  var peg$e14 = peg$literalExpectation("#", false);
+  var peg$e15 = peg$literalExpectation("[", false);
+  var peg$e16 = peg$literalExpectation("]", false);
+  var peg$e17 = peg$literalExpectation("<", false);
+  var peg$e18 = peg$literalExpectation(">", false);
+  var peg$e19 = peg$literalExpectation("@", false);
+  var peg$e20 = peg$literalExpectation("(", false);
+  var peg$e21 = peg$literalExpectation(")", false);
+  var peg$e22 = peg$literalExpectation("/", false);
+  var peg$e23 = peg$literalExpectation("*", false);
+  var peg$e24 = peg$literalExpectation("%", false);
+  var peg$e25 = peg$literalExpectation("struct", false);
+  var peg$e26 = peg$literalExpectation("target", false);
+  var peg$e27 = peg$literalExpectation("euclid", false);
+  var peg$e28 = peg$literalExpectation("slow", false);
+  var peg$e29 = peg$literalExpectation("rotL", false);
+  var peg$e30 = peg$literalExpectation("rotR", false);
+  var peg$e31 = peg$literalExpectation("fast", false);
+  var peg$e32 = peg$literalExpectation("scale", false);
+  var peg$e33 = peg$literalExpectation("//", false);
+  var peg$e34 = peg$classExpectation(["\n"], true, false);
+  var peg$e35 = peg$literalExpectation("cat", false);
+  var peg$e36 = peg$literalExpectation("$", false);
+  var peg$e37 = peg$literalExpectation("setcps", false);
+  var peg$e38 = peg$literalExpectation("setbpm", false);
+  var peg$e39 = peg$literalExpectation("hush", false);
+
+  var peg$f0 = function() { return parseFloat(text()); };
+  var peg$f1 = function(chars) { return chars.join("") };
+  var peg$f2 = function(s) { return s};
+  var peg$f3 = function(sc) { sc.arguments_.alignment = "t"; return sc;};
+  var peg$f4 = function(a) { return { weight: a} };
+  var peg$f5 = function(p, s) { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s } } } };
+  var peg$f6 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:a } } } };
+  var peg$f7 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:"1/"+a } } } };
+  var peg$f8 = function(a) { return { operator : { type_: "fixed-step", arguments_ :{ amount:a } } } };
+  var peg$f9 = function(s, o) { return new ElementStub(s, o);};
+  var peg$f10 = function(s) { return new PatternStub(s,"h"); };
+  var peg$f11 = function(c, v) { return v};
+  var peg$f12 = function(c, cs) { if (cs.length == 0 && c instanceof Object) { return c;} else { cs.unshift(c); return new PatternStub(cs,"v");}  };
+  var peg$f13 = function(s) { return s; };
+  var peg$f14 = function(s) { return { name: "struct", args: { sequence:s }}};
+  var peg$f15 = function(s) { return { name: "target", args : { name:s}}};
+  var peg$f16 = function(p, s) { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}};
+  var peg$f17 = function(a) { return { name: "stretch", args :{ amount: a}}};
+  var peg$f18 = function(a) { return { name: "shift", args :{ amount: "-"+a}}};
+  var peg$f19 = function(a) { return { name: "shift", args :{ amount: a}}};
+  var peg$f20 = function(a) { return { name: "stretch", args :{ amount: "1/"+a}}};
+  var peg$f21 = function(s) { return { name: "scale", args :{ scale: s.join("")}}};
+  var peg$f22 = function(s, v) { return v};
+  var peg$f23 = function(s, ss) { ss.unshift(s); return new PatternStub(ss,"t"); };
+  var peg$f24 = function(sg) {return sg};
+  var peg$f25 = function(o, soc) { return new OperatorStub(o.name,o.args,soc)};
+  var peg$f26 = function(sc) { return sc };
+  var peg$f27 = function(c) { return c };
+  var peg$f28 = function(v) { return new CommandStub("setcps", { value: v})};
+  var peg$f29 = function(v) { return new CommandStub("setcps", { value: (v/120/2)})};
+  var peg$f30 = function() { return new CommandStub("hush")};
+
+  var peg$currPos = 0;
+  var peg$savedPos = 0;
+  var peg$posDetailsCache = [{ line: 1, column: 1 }];
+  var peg$maxFailPos = 0;
+  var peg$maxFailExpected = [];
+  var peg$silentFails = 0;
+
+  var peg$result;
+
+  if ("startRule" in options) {
+    if (!(options.startRule in peg$startRuleFunctions)) {
+      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+    }
+
+    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+  }
+
+  function text() {
+    return input.substring(peg$savedPos, peg$currPos);
+  }
+
+  function offset() {
+    return peg$savedPos;
+  }
+
+  function range() {
+    return {
+      source: peg$source,
+      start: peg$savedPos,
+      end: peg$currPos
+    };
+  }
+
+  function location() {
+    return peg$computeLocation(peg$savedPos, peg$currPos);
+  }
+
+  function expected(description, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildStructuredError(
+      [peg$otherExpectation(description)],
+      input.substring(peg$savedPos, peg$currPos),
+      location
+    );
+  }
+
+  function error(message, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildSimpleError(message, location);
+  }
+
+  function peg$literalExpectation(text, ignoreCase) {
+    return { type: "literal", text: text, ignoreCase: ignoreCase };
+  }
+
+  function peg$classExpectation(parts, inverted, ignoreCase) {
+    return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+  }
+
+  function peg$anyExpectation() {
+    return { type: "any" };
+  }
+
+  function peg$endExpectation() {
+    return { type: "end" };
+  }
+
+  function peg$otherExpectation(description) {
+    return { type: "other", description: description };
+  }
+
+  function peg$computePosDetails(pos) {
+    var details = peg$posDetailsCache[pos];
+    var p;
+
+    if (details) {
+      return details;
+    } else {
+      p = pos - 1;
+      while (!peg$posDetailsCache[p]) {
+        p--;
+      }
+
+      details = peg$posDetailsCache[p];
+      details = {
+        line: details.line,
+        column: details.column
+      };
+
+      while (p < pos) {
+        if (input.charCodeAt(p) === 10) {
+          details.line++;
+          details.column = 1;
+        } else {
+          details.column++;
+        }
+
+        p++;
+      }
+
+      peg$posDetailsCache[pos] = details;
+
+      return details;
+    }
+  }
+
+  function peg$computeLocation(startPos, endPos) {
+    var startPosDetails = peg$computePosDetails(startPos);
+    var endPosDetails = peg$computePosDetails(endPos);
+
+    return {
+      source: peg$source,
+      start: {
+        offset: startPos,
+        line: startPosDetails.line,
+        column: startPosDetails.column
+      },
+      end: {
+        offset: endPos,
+        line: endPosDetails.line,
+        column: endPosDetails.column
+      }
+    };
+  }
+
+  function peg$fail(expected) {
+    if (peg$currPos < peg$maxFailPos) { return; }
+
+    if (peg$currPos > peg$maxFailPos) {
+      peg$maxFailPos = peg$currPos;
+      peg$maxFailExpected = [];
+    }
+
+    peg$maxFailExpected.push(expected);
+  }
+
+  function peg$buildSimpleError(message, location) {
+    return new peg$SyntaxError(message, null, null, location);
+  }
+
+  function peg$buildStructuredError(expected, found, location) {
+    return new peg$SyntaxError(
+      peg$SyntaxError.buildMessage(expected, found),
+      expected,
+      found,
+      location
+    );
+  }
+
+  function peg$parsestart() {
+    var s0;
+
+    s0 = peg$parsestatement();
+
+    return s0;
+  }
+
+  function peg$parsenumber() {
+    var s0, s1, s2, s3, s4;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parseminus();
+    if (s1 === peg$FAILED) {
+      s1 = null;
+    }
+    s2 = peg$parseint();
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsefrac();
+      if (s3 === peg$FAILED) {
+        s3 = null;
+      }
+      s4 = peg$parseexp();
+      if (s4 === peg$FAILED) {
+        s4 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f0();
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsedecimal_point() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 46) {
+      s0 = peg$c0;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e1); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsedigit1_9() {
+    var s0;
+
+    if (peg$r0.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e2); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsee() {
+    var s0;
+
+    if (peg$r1.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseexp() {
+    var s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parsee();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseminus();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parseplus();
+      }
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      s3 = [];
+      s4 = peg$parseDIGIT();
+      if (s4 !== peg$FAILED) {
+        while (s4 !== peg$FAILED) {
+          s3.push(s4);
+          s4 = peg$parseDIGIT();
+        }
+      } else {
+        s3 = peg$FAILED;
+      }
+      if (s3 !== peg$FAILED) {
+        s1 = [s1, s2, s3];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsefrac() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsedecimal_point();
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$parseDIGIT();
+      if (s3 !== peg$FAILED) {
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parseDIGIT();
+        }
+      } else {
+        s2 = peg$FAILED;
+      }
+      if (s2 !== peg$FAILED) {
+        s1 = [s1, s2];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseint() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$parsezero();
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parsedigit1_9();
+      if (s1 !== peg$FAILED) {
+        s2 = [];
+        s3 = peg$parseDIGIT();
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          s3 = peg$parseDIGIT();
+        }
+        s1 = [s1, s2];
+        s0 = s1;
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseminus() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 45) {
+      s0 = peg$c1;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e4); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseplus() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 43) {
+      s0 = peg$c2;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e5); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsezero() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 48) {
+      s0 = peg$c3;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e6); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseDIGIT() {
+    var s0;
+
+    if (peg$r2.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e7); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsews() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = [];
+    if (peg$r3.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e9); }
+    }
+    while (s1 !== peg$FAILED) {
+      s0.push(s1);
+      if (peg$r3.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e9); }
+      }
+    }
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e8); }
+
+    return s0;
+  }
+
+  function peg$parsecomma() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 44) {
+      s2 = peg$c4;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s1 = [s1, s2, s3];
+      s0 = s1;
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsequote() {
+    var s0;
+
+    if (input.charCodeAt(peg$currPos) === 34) {
+      s0 = peg$c5;
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e11); }
+    }
+    if (s0 === peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 39) {
+        s0 = peg$c6;
+        peg$currPos++;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e12); }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestep_char() {
+    var s0;
+
+    if (peg$r4.test(input.charAt(peg$currPos))) {
+      s0 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s0 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
+    }
+    if (s0 === peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 45) {
+        s0 = peg$c1;
+        peg$currPos++;
+      } else {
+        s0 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e4); }
+      }
+      if (s0 === peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 35) {
+          s0 = peg$c7;
+          peg$currPos++;
+        } else {
+          s0 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e14); }
+        }
+        if (s0 === peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 46) {
+            s0 = peg$c0;
+            peg$currPos++;
+          } else {
+            s0 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e1); }
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestep() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = [];
+    s3 = peg$parsestep_char();
+    if (s3 !== peg$FAILED) {
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$parsestep_char();
+      }
+    } else {
+      s2 = peg$FAILED;
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      peg$savedPos = s0;
+      s0 = peg$f1(s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesub_cycle() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 91) {
+      s2 = peg$c8;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e15); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s4 = peg$parsestack();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 93) {
+          s6 = peg$c9;
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e16); }
+        }
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parsews();
+          peg$savedPos = s0;
+          s0 = peg$f2(s4);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsetimeline() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    if (input.charCodeAt(peg$currPos) === 60) {
+      s2 = peg$c10;
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e17); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      s4 = peg$parsesingle_cycle();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 62) {
+          s6 = peg$c11;
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e18); }
+        }
+        if (s6 !== peg$FAILED) {
+          s7 = peg$parsews();
+          peg$savedPos = s0;
+          s0 = peg$f3(s4);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice() {
+    var s0;
+
+    s0 = peg$parsestep();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsesub_cycle();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsetimeline();
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_modifier() {
+    var s0;
+
+    s0 = peg$parseslice_weight();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parseslice_bjorklund();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parseslice_slow();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parseslice_fast();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parseslice_fixed_step();
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_weight() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 64) {
+      s1 = peg$c12;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e19); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f4(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_bjorklund() {
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 40) {
+      s1 = peg$c13;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e20); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parsecomma();
+        if (s5 !== peg$FAILED) {
+          s6 = peg$parsews();
+          s7 = peg$parsenumber();
+          if (s7 !== peg$FAILED) {
+            s8 = peg$parsews();
+            if (input.charCodeAt(peg$currPos) === 41) {
+              s9 = peg$c14;
+              peg$currPos++;
+            } else {
+              s9 = peg$FAILED;
+              if (peg$silentFails === 0) { peg$fail(peg$e21); }
+            }
+            if (s9 !== peg$FAILED) {
+              peg$savedPos = s0;
+              s0 = peg$f5(s3, s7);
+            } else {
+              peg$currPos = s0;
+              s0 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_slow() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 47) {
+      s1 = peg$c15;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e22); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f6(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_fast() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 42) {
+      s1 = peg$c16;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e23); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f7(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_fixed_step() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 37) {
+      s1 = peg$c17;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e24); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsenumber();
+      if (s2 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f8(s2);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslice_with_modifier() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    s1 = peg$parseslice();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseslice_modifier();
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f9(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesingle_cycle() {
+    var s0, s1, s2;
+
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parseslice_with_modifier();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parseslice_with_modifier();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f10(s1);
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsestack() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesingle_cycle();
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      s3 = peg$currPos;
+      s4 = peg$parsecomma();
+      if (s4 !== peg$FAILED) {
+        s5 = peg$parsesingle_cycle();
+        if (s5 !== peg$FAILED) {
+          peg$savedPos = s3;
+          s3 = peg$f11(s1, s5);
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s3;
+        s3 = peg$FAILED;
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        s3 = peg$currPos;
+        s4 = peg$parsecomma();
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsesingle_cycle();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s3;
+            s3 = peg$f11(s1, s5);
+          } else {
+            peg$currPos = s3;
+            s3 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s3;
+          s3 = peg$FAILED;
+        }
+      }
+      peg$savedPos = s0;
+      s0 = peg$f12(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence() {
+    var s0, s1, s2, s3, s4;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = peg$parsequote();
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsestack();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsequote();
+        if (s4 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f13(s3);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseoperator() {
+    var s0;
+
+    s0 = peg$parsescale();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parseslow();
+      if (s0 === peg$FAILED) {
+        s0 = peg$parsefast();
+        if (s0 === peg$FAILED) {
+          s0 = peg$parsetarget();
+          if (s0 === peg$FAILED) {
+            s0 = peg$parsebjorklund();
+            if (s0 === peg$FAILED) {
+              s0 = peg$parsestruct();
+              if (s0 === peg$FAILED) {
+                s0 = peg$parserotR();
+                if (s0 === peg$FAILED) {
+                  s0 = peg$parserotL();
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsestruct() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c18) {
+      s1 = peg$c18;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e25); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsesequence_or_operator();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f14(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsetarget() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c19) {
+      s1 = peg$c19;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e26); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsequote();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsestep();
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsequote();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f15(s4);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsebjorklund() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c20) {
+      s1 = peg$c20;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e27); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parseint();
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parseint();
+        if (s5 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f16(s3, s5);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parseslow() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c21) {
+      s1 = peg$c21;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e28); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f17(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parserotL() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c22) {
+      s1 = peg$c22;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e29); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f18(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parserotR() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c23) {
+      s1 = peg$c23;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e30); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f19(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsefast() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c24) {
+      s1 = peg$c24;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e31); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f20(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsescale() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 5) === peg$c25) {
+      s1 = peg$c25;
+      peg$currPos += 5;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e32); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsequote();
+      if (s3 !== peg$FAILED) {
+        s4 = [];
+        s5 = peg$parsestep_char();
+        if (s5 !== peg$FAILED) {
+          while (s5 !== peg$FAILED) {
+            s4.push(s5);
+            s5 = peg$parsestep_char();
+          }
+        } else {
+          s4 = peg$FAILED;
+        }
+        if (s4 !== peg$FAILED) {
+          s5 = peg$parsequote();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f21(s4);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsecomment() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 2) === peg$c26) {
+      s1 = peg$c26;
+      peg$currPos += 2;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e33); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      if (peg$r5.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e34); }
+      }
+      while (s3 !== peg$FAILED) {
+        s2.push(s3);
+        if (peg$r5.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e34); }
+        }
+      }
+      s1 = [s1, s2];
+      s0 = s1;
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsecat() {
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 3) === peg$c27) {
+      s1 = peg$c27;
+      peg$currPos += 3;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e35); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      if (input.charCodeAt(peg$currPos) === 91) {
+        s3 = peg$c8;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e15); }
+      }
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parsews();
+        s5 = peg$parsesequence_or_operator();
+        if (s5 !== peg$FAILED) {
+          s6 = [];
+          s7 = peg$currPos;
+          s8 = peg$parsecomma();
+          if (s8 !== peg$FAILED) {
+            s9 = peg$parsesequence_or_operator();
+            if (s9 !== peg$FAILED) {
+              peg$savedPos = s7;
+              s7 = peg$f22(s5, s9);
+            } else {
+              peg$currPos = s7;
+              s7 = peg$FAILED;
+            }
+          } else {
+            peg$currPos = s7;
+            s7 = peg$FAILED;
+          }
+          while (s7 !== peg$FAILED) {
+            s6.push(s7);
+            s7 = peg$currPos;
+            s8 = peg$parsecomma();
+            if (s8 !== peg$FAILED) {
+              s9 = peg$parsesequence_or_operator();
+              if (s9 !== peg$FAILED) {
+                peg$savedPos = s7;
+                s7 = peg$f22(s5, s9);
+              } else {
+                peg$currPos = s7;
+                s7 = peg$FAILED;
+              }
+            } else {
+              peg$currPos = s7;
+              s7 = peg$FAILED;
+            }
+          }
+          s7 = peg$parsews();
+          if (input.charCodeAt(peg$currPos) === 93) {
+            s8 = peg$c9;
+            peg$currPos++;
+          } else {
+            s8 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e16); }
+          }
+          if (s8 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f23(s5, s6);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_or_group() {
+    var s0;
+
+    s0 = peg$parsecat();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsesequence();
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_or_operator() {
+    var s0, s1, s2, s3, s4, s5;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesequence_or_group();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = [];
+      s4 = peg$parsecomment();
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        s4 = peg$parsecomment();
+      }
+      peg$savedPos = s0;
+      s0 = peg$f24(s1);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parseoperator();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parsews();
+        if (input.charCodeAt(peg$currPos) === 36) {
+          s3 = peg$c28;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e36); }
+        }
+        if (s3 !== peg$FAILED) {
+          s4 = peg$parsews();
+          s5 = peg$parsesequence_or_operator();
+          if (s5 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f25(s1, s5);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequ_or_operator_or_comment() {
+    var s0, s1;
+
+    s0 = peg$currPos;
+    s1 = peg$parsesequence_or_operator();
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f26(s1);
+    }
+    s0 = s1;
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsecomment();
+    }
+
+    return s0;
+  }
+
+  function peg$parsesequence_definition() {
+    var s0;
+
+    s0 = peg$parsesequ_or_operator_or_comment();
+
+    return s0;
+  }
+
+  function peg$parsecommand() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    s1 = peg$parsews();
+    s2 = peg$parsesetcps();
+    if (s2 === peg$FAILED) {
+      s2 = peg$parsesetbpm();
+      if (s2 === peg$FAILED) {
+        s2 = peg$parsehush();
+      }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = peg$parsews();
+      peg$savedPos = s0;
+      s0 = peg$f27(s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesetcps() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c29) {
+      s1 = peg$c29;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e37); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f28(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsesetbpm() {
+    var s0, s1, s2, s3;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 6) === peg$c30) {
+      s1 = peg$c30;
+      peg$currPos += 6;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e38); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parsews();
+      s3 = peg$parsenumber();
+      if (s3 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s0 = peg$f29(s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+
+    return s0;
+  }
+
+  function peg$parsehush() {
+    var s0, s1;
+
+    s0 = peg$currPos;
+    if (input.substr(peg$currPos, 4) === peg$c31) {
+      s1 = peg$c31;
+      peg$currPos += 4;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e39); }
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f30();
+    }
+    s0 = s1;
+
+    return s0;
+  }
+
+  function peg$parsestatement() {
+    var s0;
+
+    s0 = peg$parsesequence_definition();
+    if (s0 === peg$FAILED) {
+      s0 = peg$parsecommand();
+    }
+
+    return s0;
+  }
+
+
+    var PatternStub = function(source, alignment)
+    {
+      this.type_ = "pattern";
+      this.arguments_ = { alignment : alignment};
+      this.source_ = source;
+    }
+
+    var OperatorStub = function(name, args, source)
+    {
+      this.type_ = name;
+      this.arguments_ = args;
+      this.source_ = source;
+    }
+
+    var ElementStub = function(source, options)
+    {
+      this.type_ = "element";
+      this.source_ = source;
+      this.options_ = options;
+    }
+
+    var CommandStub = function(name, options)
+    {
+      this.type_ = "command";
+      this.name_ = name;
+      this.options_ = options;
+    }
+
+
+
+  peg$result = peg$startRuleFunction();
+
+  if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+    return peg$result;
+  } else {
+    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+      peg$fail(peg$endExpectation());
+    }
+
+    throw peg$buildStructuredError(
+      peg$maxFailExpected,
+      peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+      peg$maxFailPos < input.length
+        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+    );
+  }
+}
+
+export {
+  peg$SyntaxError as SyntaxError,
+  peg$parse as parse
+};
diff --git a/repl/krill.pegjs b/repl/krill.pegjs
new file mode 100644
index 00000000..e32a9763
--- /dev/null
+++ b/repl/krill.pegjs
@@ -0,0 +1,207 @@
+// Some terminology:
+// a sequence = a serie of elements placed between quotes
+// a stack = a serie of vertically aligned slices sharing the same overall length
+// a slice = a serie of horizontally aligned elements
+
+
+{
+  var PatternStub = function(source, alignment)
+  {
+    this.type_ = "pattern";
+    this.arguments_ = { alignment : alignment};
+    this.source_ = source;
+  }
+
+  var OperatorStub = function(name, args, source)
+  {
+    this.type_ = name;
+    this.arguments_ = args;
+    this.source_ = source;
+  }
+
+  var ElementStub = function(source, options)
+  {
+    this.type_ = "element";
+    this.source_ = source;
+    this.options_ = options;
+  }
+
+  var CommandStub = function(name, options)
+  {
+    this.type_ = "command";
+    this.name_ = name;
+    this.options_ = options;
+  }
+
+}
+
+start = statement
+
+// ----- Numbers -----
+
+number "number"
+  = minus? int frac? exp? { return parseFloat(text()); }
+
+decimal_point
+  = "."
+
+digit1_9
+  = [1-9]
+
+e
+  = [eE]
+
+exp
+  = e (minus / plus)? DIGIT+
+
+frac
+  = decimal_point DIGIT+
+
+int
+  = zero / (digit1_9 DIGIT*)
+
+minus
+  = "-"
+
+plus
+  = "+"
+
+zero
+  = "0"
+
+DIGIT  = [0-9]
+
+// ------------------ delimiters ---------------------------
+
+ws "whitespace" = [ \n\r\t]*
+comma = ws "," ws;
+quote = '"' / "'"
+
+// ------------------ steps and cycles ---------------------------
+
+// single step definition (e.g bd)
+step_char =  [0-9a-zA-Z~] / "-" / "#" / "."
+step = ws chars:step_char+ ws { return chars.join("") }
+
+// define a sub cycle e.g. [1 2, 3 [4]]
+sub_cycle = ws  "[" ws s:stack ws "]" ws { return s}
+
+// define a timeline e.g <1 3 [3 5]>. We simply defer to a stack and change the alignement
+timeline = ws "<" ws sc:single_cycle ws ">" ws
+  { sc.arguments_.alignment = "t"; return sc;}
+
+// a slice is either a single step or a sub cycle
+slice = step / sub_cycle  / timeline
+
+// slice modifier affects the timing/size of a slice (e.g. [a b c]@3)
+// at this point, we assume we can represent them as regular sequence operators
+slice_modifier = slice_weight / slice_bjorklund / slice_slow / slice_fast / slice_fixed_step
+
+slice_weight =  "@" a:number
+  { return { weight: a} }
+
+slice_bjorklund = "(" ws p:number ws comma ws s:number ws")"
+  { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s } } } }
+
+slice_slow = "/"a:number
+  { return { operator : { type_: "stretch", arguments_ :{ amount:a } } } }
+
+slice_fast = "*"a:number
+  { return { operator : { type_: "stretch", arguments_ :{ amount:"1/"+a } } } }
+
+slice_fixed_step = "%"a:number
+  { return { operator : { type_: "fixed-step", arguments_ :{ amount:a } } } }
+
+// a slice with an modifier applied i.e [bd@4 sd@3]@2 hh]
+slice_with_modifier = s:slice o:slice_modifier?
+  { return new ElementStub(s, o);}
+
+// a single cycle is a combination of one or more successive slices (as an array). If we
+// have only one element, we skip the array and return the element itself
+single_cycle = s:(slice_with_modifier)+
+  { return new PatternStub(s,"h"); }
+
+// a stack is a serie of vertically aligned single cycles, separated by a comma
+// if the stack contains only one element, we don't create a stack but return the
+// underlying element
+stack = c:single_cycle cs:(comma v:single_cycle { return v})*
+  { if (cs.length == 0 && c instanceof Object) { return c;} else { cs.unshift(c); return new PatternStub(cs,"v");}  }
+
+// a sequence is a quoted stack
+sequence = ws quote s:stack quote
+  { return s; }
+
+// ------------------ operators ---------------------------
+
+operator = scale / slow / fast / target / bjorklund / struct / rotR / rotL
+
+struct = "struct" ws s:sequence_or_operator
+  { return { name: "struct", args: { sequence:s }}}
+
+target = "target" ws quote s:step quote
+  { return { name: "target", args : { name:s}}}
+
+bjorklund = "euclid" ws p:int ws s:int
+  { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}}
+
+slow = "slow" ws a:number
+  { return { name: "stretch", args :{ amount: a}}}
+
+rotL = "rotL" ws a:number
+  { return { name: "shift", args :{ amount: "-"+a}}}
+
+rotR = "rotR" ws a:number
+  { return { name: "shift", args :{ amount: a}}}
+
+fast = "fast" ws a:number
+  { return { name: "stretch", args :{ amount: "1/"+a}}}
+
+scale = "scale" ws quote s:(step_char)+ quote
+{ return { name: "scale", args :{ scale: s.join("")}}}
+
+comment = '//' p:([^\n]*)
+
+// ---------------- grouping --------------------------------
+
+group_operator = cat
+
+// cat is another form of timeline
+cat = "cat" ws "[" ws  s:sequence_or_operator ss:(comma v:sequence_or_operator { return v})* ws "]"
+  { ss.unshift(s); return new PatternStub(ss,"t"); }
+
+// ------------------ high level sequence ---------------------------
+
+sequence_or_group =
+  group_operator /
+  sequence
+
+sequence_or_operator =
+  sg:sequence_or_group ws (comment)*
+    {return sg}
+  / o:operator ws "$" ws soc:sequence_or_operator
+    { return new OperatorStub(o.name,o.args,soc)}
+
+sequ_or_operator_or_comment =
+  sc: sequence_or_operator
+    { return sc }
+   / comment
+
+sequence_definition = s:sequ_or_operator_or_comment
+
+// ---------------------- statements ----------------------------
+
+command = ws c:(setcps / setbpm / hush) ws
+  { return c }
+
+setcps = "setcps" ws v:number
+  { return new CommandStub("setcps", { value: v})}
+
+setbpm = "setbpm" ws v:number
+  { return new CommandStub("setcps", { value: (v/120/2)})}
+
+hush = "hush"
+  { return new CommandStub("hush")}
+
+// ---------------------- statements ----------------------------
+
+statement = sequence_definition / command
diff --git a/repl/package-lock.json b/repl/package-lock.json
index 6ffdd90a..d9166583 100644
--- a/repl/package-lock.json
+++ b/repl/package-lock.json
@@ -5,7 +5,10 @@
   "packages": {
     "": {
       "dependencies": {
+        "@tonaljs/tonal": "^4.6.5",
+        "codemirror": "^5.65.1",
         "react": "^17.0.2",
+        "react-codemirror2": "^7.2.1",
         "react-dom": "^17.0.2",
         "tone": "^14.7.77"
       },
@@ -25,6 +28,7 @@
         "@web/test-runner": "^0.13.3",
         "autoprefixer": "^10.4.2",
         "chai": "^4.3.4",
+        "peggy": "^1.2.0",
         "postcss": "^8.4.6",
         "prettier": "^2.2.1",
         "snowpack": "^3.3.7",
@@ -1082,6 +1086,205 @@
         "react-dom": "*"
       }
     },
+    "node_modules/@tonaljs/abc-notation": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/abc-notation/-/abc-notation-4.6.5.tgz",
+      "integrity": "sha512-1S0Jnx0NfDLgyhkQOMEHqOacELL6RUdPcWWUP+nAnsOsb9owvB9RKYLSzp5odd16FVUR7U8c/JLc2yxIRvSeJw==",
+      "dependencies": {
+        "@tonaljs/core": "^4.6.5"
+      }
+    },
+    "node_modules/@tonaljs/array": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/array/-/array-4.6.5.tgz",
+      "integrity": "sha512-7A3DbBQ+qIQ134FqE518b4tJ8V2a15Sn303JjHzgnqZqKrNh/s3wqwkL60F7LKcd09tcp+vIKQP/MYt4xMcRAA==",
+      "dependencies": {
+        "@tonaljs/core": "^4.6.5"
+      }
+    },
+    "node_modules/@tonaljs/chord": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/chord/-/chord-4.6.5.tgz",
+      "integrity": "sha512-Pjdel4aDVv4kcx9PW6Qozt5BB9nAt13AOExfzKztpgPmlBSy0SKHse7Jp1cA4MGAuLHU8dzVssTFYpCskEFw3w==",
+      "dependencies": {
+        "@tonaljs/chord-detect": "^4.6.5",
+        "@tonaljs/chord-type": "^4.6.5",
+        "@tonaljs/collection": "^4.6.2",
+        "@tonaljs/core": "^4.6.5",
+        "@tonaljs/pcset": "^4.6.5",
+        "@tonaljs/scale-type": "^4.6.5"
+      }
+    },
+    "node_modules/@tonaljs/chord-detect": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/chord-detect/-/chord-detect-4.6.5.tgz",
+      "integrity": "sha512-4xu53UP4kNTfdTNpAAVijhXcQ+ypJqmeMnsST08ZXSjoYfJUhmf5rWDWfz36KOTtNdCA6AbYgdtTYV/Xw0nd/w==",
+      "dependencies": {
+        "@tonaljs/chord-type": "^4.6.5",
+        "@tonaljs/core": "^4.6.5",
+        "@tonaljs/pcset": "^4.6.5"
+      }
+    },
+    "node_modules/@tonaljs/chord-type": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/chord-type/-/chord-type-4.6.5.tgz",
+      "integrity": "sha512-Ol4DDopqpZCF9odosO2i8I+plud3Ul7VWJGNvL+PPCf4Qnwuz87q3aJQDLNoRUz4VyW0u66mq3LyVh6A8kb6Ug==",
+      "dependencies": {
+        "@tonaljs/core": "^4.6.5",
+        "@tonaljs/pcset": "^4.6.5"
+      }
+    },
+    "node_modules/@tonaljs/collection": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/@tonaljs/collection/-/collection-4.6.2.tgz",
+      "integrity": "sha512-bfPCotLJNB/tG1NrdbsQPLDKZB5jlMs7uPQ6RYKiNkaena3345ZKkbCGl5pj6YTXeDm/oblXiSbFAn7SlLRZdQ=="
+    },
+    "node_modules/@tonaljs/core": {
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/@tonaljs/core/-/core-4.6.5.tgz",
+      "integrity": "sha512-t7Vx0+L3j/ubQj2AhI1H45D/K745np4DwJjJjXNi5FlGD+TL2wyw50dCwkHKGHsrLDqup1qqP6yN7LBpC6UwNg=="
+    },
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+      "requires": {
+        "@tonaljs/abc-notation": "^4.6.5",
+        "@tonaljs/array": "^4.6.5",
+        "@tonaljs/chord": "^4.6.5",
+        "@tonaljs/chord-type": "^4.6.5",
+        "@tonaljs/collection": "^4.6.2",
+        "@tonaljs/core": "^4.6.5",
+        "@tonaljs/duration-value": "^4.6.2",
+        "@tonaljs/interval": "^4.6.5",
+        "@tonaljs/key": "^4.6.5",
+        "@tonaljs/midi": "^4.6.5",
+        "@tonaljs/mode": "^4.6.5",
+        "@tonaljs/note": "^4.6.5",
+        "@tonaljs/pcset": "^4.6.5",
+        "@tonaljs/progression": "^4.6.5",
+        "@tonaljs/range": "^4.6.5",
+        "@tonaljs/roman-numeral": "^4.6.5",
+        "@tonaljs/scale": "^4.6.5",
+        "@tonaljs/scale-type": "^4.6.5",
+        "@tonaljs/time-signature": "^4.6.2"
+      }
+    },
     "@tootallnate/once": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
@@ -10524,6 +10952,11 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
+    "codemirror": {
+      "version": "5.65.1",
+      "resolved": "https://registry.npmjs.org/codemirror/-/codemirror-5.65.1.tgz",
+      "integrity": "sha512-s6aac+DD+4O2u1aBmdxhB7yz2XU7tG3snOyQ05Kxifahz7hoxnfxIRHxiCSEv3TUC38dIVH8G+lZH9UWSfGQxA=="
+    },
     "color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -13113,6 +13546,12 @@
       "integrity": "sha512-Dp6zGqpTdETdR63lehJYPeIOqpiNBNtc7BpWSLrOje7UaIsE5aY92r/AunQA7rsXvet3lrJ3JnZX29UPTKXyKQ==",
       "dev": true
     },
+    "peggy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/peggy/-/peggy-1.2.0.tgz",
+      "integrity": "sha512-PQ+NKpAobImfMprYQtc4Egmyi29bidRGEX0kKjCU5uuW09s0Cthwqhfy7mLkwcB4VcgacE5L/ZjruD/kOPCUUw==",
+      "dev": true
+    },
     "pend": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/pend/-/pend-1.2.0.tgz",
@@ -13506,6 +13945,12 @@
         "object-assign": "^4.1.1"
       }
     },
+    "react-codemirror2": {
+      "version": "7.2.1",
+      "resolved": "https://registry.npmjs.org/react-codemirror2/-/react-codemirror2-7.2.1.tgz",
+      "integrity": "sha512-t7YFmz1AXdlImgHXA9Ja0T6AWuopilub24jRaQdPVbzUJVNKIYuy3uCFZYa7CE5S3UW6SrSa5nAqVQvtzRF9gw==",
+      "requires": {}
+    },
     "react-dom": {
       "version": "17.0.2",
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-17.0.2.tgz",
diff --git a/repl/package.json b/repl/package.json
index eabaec9d..2e87f86c 100644
--- a/repl/package.json
+++ b/repl/package.json
@@ -4,10 +4,14 @@
     "build": "snowpack build && cp ./public/.nojekyll ../docs",
     "test": "web-test-runner \"src/**/*.test.tsx\"",
     "format": "prettier --write \"src/**/*.{js,jsx,ts,tsx}\"",
-    "lint": "prettier --check \"src/**/*.{js,jsx,ts,tsx}\""
+    "lint": "prettier --check \"src/**/*.{js,jsx,ts,tsx}\"",
+    "peggy": "peggy -o krill-parser.js --format es ./krill.pegjs"
   },
   "dependencies": {
+    "@tonaljs/tonal": "^4.6.5",
+    "codemirror": "^5.65.1",
     "react": "^17.0.2",
+    "react-codemirror2": "^7.2.1",
     "react-dom": "^17.0.2",
     "tone": "^14.7.77"
   },
@@ -27,6 +31,7 @@
     "@web/test-runner": "^0.13.3",
     "autoprefixer": "^10.4.2",
     "chai": "^4.3.4",
+    "peggy": "^1.2.0",
     "postcss": "^8.4.6",
     "prettier": "^2.2.1",
     "snowpack": "^3.3.7",
diff --git a/repl/public/global.css b/repl/public/global.css
index b5c61c95..668d4a6c 100644
--- a/repl/public/global.css
+++ b/repl/public/global.css
@@ -1,3 +1,8 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+.react-codemirror2,
+.CodeMirror {
+  height: 100% !important;
+}
diff --git a/repl/src/App.tsx b/repl/src/App.tsx
index c2770173..52d8bf82 100644
--- a/repl/src/App.tsx
+++ b/repl/src/App.tsx
@@ -5,16 +5,15 @@ import cx from './cx';
 import * as Tone from 'tone';
 import useCycle from './useCycle';
 import type { Hap, Pattern } from './types';
-import { tetris } from './tunes';
+import * as tunes from './tunes';
+import * as krill from './parse';
+import CodeMirror from './CodeMirror';
 
-const { Fraction, TimeSpan } = strudel;
+const { tetris, tetrisMini, tetrisHaskell } = tunes;
 
-const fr = (v: number) => new Fraction(v);
-const ts = (start: number, end: number) => new TimeSpan(fr(start), fr(end));
-const parse = (code: string): Pattern => {
-  const { sequence, pure, reify, slowcat, fastcat, cat, stack, silence } = strudel; // make available to eval
-  return eval(code);
-};
+const { sequence, pure, reify, slowcat, fastcat, cat, stack, silence } = strudel; // make available to eval
+const { mini, h } = krill; // for eval (direct import wont work somehow)
+const parse = (code: string): Pattern => eval(code);
 
 const synth = new Tone.PolySynth().toDestination();
 synth.set({
@@ -25,7 +24,8 @@ synth.set({
 });
 
 function App() {
-  const [code, setCode] = useState<string>(tetris);
+  const [mode, setMode] = useState<string>('javascript');
+  const [code, setCode] = useState<string>(tetrisHaskell);
   const [log, setLog] = useState('');
   const logBox = useRef<any>();
   const [error, setError] = useState<Error>();
@@ -65,11 +65,22 @@ function App() {
   // parse pattern when code changes
   useEffect(() => {
     try {
-      const _pattern = parse(code);
+      let _pattern;
+      try {
+        _pattern = h(code);
+        setMode('pegjs'); // haskell mode does not recognize quotes, pegjs looks ok by accident..
+        // console.log('h _pattern', _pattern);
+      } catch (err) {
+        setMode('javascript');
+        // code is not haskell like
+        _pattern = parse(code);
+        // console.log('not haskell..', _pattern);
+      }
       setPattern(_pattern);
       // cycle.query(cycle.activeCycle()); // reschedule active cycle
       setError(undefined);
     } catch (err: any) {
+      console.warn(err);
       setError(err);
     }
   }, [code]);
@@ -77,38 +88,51 @@ function App() {
   useLayoutEffect(() => {
     logBox.current.scrollTop = logBox.current?.scrollHeight;
   }, [log]);
-
   return (
-    <div className="h-[100vh] bg-slate-900 flex-row">
-      <header className="px-2 flex items-center space-x-2 border-b border-gray-200 bg-white">
+    <div className="h-screen bg-slate-900 flex flex-col">
+      <header className="flex-none w-full h-16 px-2 flex items-center space-x-2 border-b border-gray-200 bg-white">
         <img src={logo} className="Tidal-logo w-16 h-16" alt="logo" />
         <h1 className="text-2xl">Strudel REPL</h1>
       </header>
-      <section className="grow p-2 text-gray-100">
-        <div className="relative">
-          <div className="absolute right-2 bottom-2 text-red-500">{error?.message}</div>
-          <textarea
+      <section className="grow flex flex-col p-2 text-gray-100">
+        <div className="grow relative">
+          <div className={cx('h-full bg-slate-600', error ? 'focus:ring-red-500' : 'focus:ring-slate-800')}>
+            <CodeMirror
+              value={code}
+              options={{
+                mode,
+                theme: 'material',
+                lineNumbers: true,
+              }}
+              onChange={(_: any, __: any, value: any) => {
+                setLog((log) => log + `${log ? '\n\n' : ''}✏️ edit\n${code}\n${value}`);
+                setCode(value);
+              }}
+            />
+          </div>
+          {error && <div className="absolute right-2 bottom-2 text-red-500">{error?.message || 'unknown error'}</div>}
+          {/* <textarea
             className={cx('w-full h-64 bg-slate-600', error ? 'focus:ring-red-500' : 'focus:ring-slate-800')}
             value={code}
             onChange={(e) => {
               setLog((log) => log + `${log ? '\n\n' : ''}✏️ edit\n${code}\n${e.target.value}`);
               setCode(e.target.value);
             }}
-          />
+          /> */}
         </div>
+        <button
+          className="flex-none w-full border border-gray-700 p-2 bg-slate-700 hover:bg-slate-500"
+          onClick={() => cycle.toggle()}
+        >
+          {cycle.started ? 'pause' : 'play'}
+        </button>
         <textarea
-          className="w-full h-64 bg-slate-600"
+          className="grow bg-[#283237] border-0"
           value={log}
           readOnly
           ref={logBox}
           style={{ fontFamily: 'monospace' }}
         />
-        <button
-          className="w-full border border-gray-700 p-2 bg-slate-700 hover:bg-slate-500"
-          onClick={() => cycle.toggle()}
-        >
-          {cycle.started ? 'pause' : 'play'}
-        </button>
       </section>
     </div>
   );
diff --git a/repl/src/CodeMirror.tsx b/repl/src/CodeMirror.tsx
new file mode 100644
index 00000000..faef177e
--- /dev/null
+++ b/repl/src/CodeMirror.tsx
@@ -0,0 +1,15 @@
+import React from 'react';
+import { Controlled as CodeMirror2 } from 'react-codemirror2';
+import 'codemirror/mode/javascript/javascript.js';
+import 'codemirror/mode/pegjs/pegjs.js';
+import 'codemirror/theme/material.css';
+import 'codemirror/lib/codemirror.css';
+
+export default function CodeMirror({ value, onChange, options }: any) {
+  options = options || {
+    mode: 'javascript',
+    theme: 'material',
+    lineNumbers: true,
+  };
+  return <CodeMirror2 value={value} options={options} onBeforeChange={onChange} />;
+}
diff --git a/repl/src/parse.d.ts b/repl/src/parse.d.ts
new file mode 100644
index 00000000..be24374b
--- /dev/null
+++ b/repl/src/parse.d.ts
@@ -0,0 +1,18 @@
+/* 
+TODO:
+export interface Arguments {
+  alignment: string;
+}
+
+export interface ElementStub {
+  type_: string;
+  source_: string;
+  options_?: any;
+}
+
+export interface PatternStub {
+  type_: string; // pattern
+  arguments_: Arguments;
+  source_: ElementStub[];
+}
+ */
diff --git a/repl/src/parse.ts b/repl/src/parse.ts
new file mode 100644
index 00000000..c3e9bb21
--- /dev/null
+++ b/repl/src/parse.ts
@@ -0,0 +1,101 @@
+import * as krill from '../krill-parser';
+import * as strudel from '../../strudel.mjs';
+import { Scale, Note, Interval } from '@tonaljs/tonal';
+
+const { sequence, stack, silence, Fraction, pure } = strudel;
+
+function reify(thing: any) {
+  if (thing?.constructor?.name === 'Pattern') {
+    return thing;
+  }
+  return pure(thing);
+}
+
+const applyOptions = (parent: any) => (pat: any, i: number) => {
+  const ast = parent.source_[i];
+  const options = ast.options_;
+  const operator = options?.operator;
+  if (operator) {
+    switch (operator.type_) {
+      case 'stretch':
+        const speed = new Fraction(operator.arguments_.amount).inverse().valueOf();
+        return reify(pat).fast(speed);
+      // TODO: case 'fixed-step': "%"
+    }
+    console.warn(`operator "${operator.type_}" not implemented`);
+  }
+  // TODO: options.weight = "@"
+  // TODO: bjorklund e.g. "c3(5,8)"
+  const unimplemented = Object.keys(options || {}).filter((key) => key !== 'operator');
+  if (unimplemented.length) {
+    console.warn(
+      `option${unimplemented.length > 1 ? 's' : ''} ${unimplemented.map((o) => `"${o}"`).join(', ')} not implemented`
+    );
+  }
+  return pat;
+};
+
+export function patternifyAST(ast: any): any {
+  switch (ast.type_) {
+    case 'pattern':
+      const children = ast.source_.map(patternifyAST).map(applyOptions(ast));
+      if (ast.arguments_.alignment === 'v') {
+        return stack(...children);
+      }
+      return sequence(...children);
+    case 'element':
+      if (ast.source_ === '~') {
+        return silence;
+      }
+      if (typeof ast.source_ !== 'object') {
+        return ast.source_;
+      }
+      return patternifyAST(ast.source_);
+    case 'stretch':
+      return patternifyAST(ast.source_).slow(ast.arguments_.amount);
+    case 'scale':
+      let [tonic, scale] = Scale.tokenize(ast.arguments_.scale);
+      const intervals = Scale.get(scale).intervals;
+      const pattern = patternifyAST(ast.source_);
+      tonic = tonic || 'C4';
+      // console.log('scale', ast, pattern, tonic, scale);
+      console.log('tonic', tonic);
+      return pattern.fmap((step: any) => {
+        step = Number(step);
+        if (isNaN(step)) {
+          console.warn(`scale step "${step}" not a number`);
+          return step;
+        }
+        const octaves = Math.floor(step / intervals.length);
+        const mod = (n: number, m: number): number => (n < 0 ? mod(n + m, m) : n % m);
+        const index = mod(step, intervals.length); // % with negative numbers. e.g. -1 % 3 = 2
+        const interval = Interval.add(intervals[index], Interval.fromSemitones(octaves * 12));
+        return Note.transpose(tonic, interval || '1P');
+      });
+    /* case 'struct':
+      // TODO:
+      return silence; */
+    default:
+      console.warn(`node type "${ast.type_}" not implemented -> returning silence`);
+      return silence;
+  }
+}
+
+// mini notation only (wraps in "")
+export const mini = (...strings: string[]) => {
+  const pattern = sequence(
+    ...strings.map((str) => {
+      const ast = krill.parse(`"${str}"`);
+      // console.log('ast', ast);
+      return patternifyAST(ast);
+    })
+  );
+  return pattern;
+};
+
+// includes haskell style (raw krill parsing)
+export const h = (string: string) => {
+  const ast = krill.parse(string);
+  // console.log('ast', ast);
+  return patternifyAST(ast);
+};
diff --git a/repl/src/tunes.ts b/repl/src/tunes.ts
index bda5f2d4..ff326c39 100644
--- a/repl/src/tunes.ts
+++ b/repl/src/tunes.ts
@@ -1,4 +1,4 @@
-export const tetris = `stack(sequence(
+export const tetrisWithFunctions = `stack(sequence(
   'e5', sequence('b4', 'c5'), 'd5', sequence('c5', 'b4'),
   'a4', sequence('a4', 'c5'), 'e5', sequence('d5', 'c5'),
   'b4', sequence(silence, 'c5'), 'd5', 'e5',
@@ -19,6 +19,91 @@ export const tetris = `stack(sequence(
   )
 )._slow(16)`;
 
+export const tetris = `stack(
+  sequence(
+    mini(
+      'e5 [b4 c5] d5 [c5 b4]',
+      'a4 [a4 c5] e5 [d5 c5]',
+      'b4 [~ c5] d5 e5',
+      'c5 a4 a4 ~',
+      '[~ d5] [~ f5] a5 [g5 f5]',
+      'e5 [~ c5] e5 [d5 c5]',
+      'b4 [b4 c5] d5 e5',
+      'c5 a4 a4 ~'
+    )
+  ),
+  sequence(
+    mini(
+      'e2 e3 e2 e3 e2 e3 e2 e3',
+      'a2 a3 a2 a3 a2 a3 a2 a3',
+      'g#2 g#3 g#2 g#3 e2 e3 e2 e3',
+      'a2 a3 a2 a3 a2 a3 b1 c2',
+      'd2 d3 d2 d3 d2 d3 d2 d3',
+      'c2 c3 c2 c3 c2 c3 c2 c3',
+      'b1 b2 b1 b2 e2 e3 e2 e3',
+      'a1 a2 a1 a2 a1 a2 a1 a2'
+    )
+  )
+)._slow(16);`;
+
+export const tetrisMini1 = `mini('[[e5 [b4 c5] d5 [c5 b4]] [a4 [a4 c5] e5 [d5 c5]] [b4 [~ c5] d5 e5] [c5 a4 a4 ~] [[~ d5] [~ f5] a5 [g5 f5]] [e5 [~ c5] e5 [d5 c5]] [b4 [b4 c5] d5 e5] [c5 a4 a4 ~]],[[e2 e3 e2 e3 e2 e3 e2 e3] [a2 a3 a2 a3 a2 a3 a2 a3] [g#2 g#3 g#2 g#3 e2 e3 e2 e3] [a2 a3 a2 a3 a2 a3 b1 c2] [d2 d3 d2 d3 d2 d3 d2 d3] [c2 c3 c2 c3 c2 c3 c2 c3] [b1 b2 b1 b2 e2 e3 e2 e3] [a1 a2 a1 a2 a1 a2 a1 a2]]')._slow(16);`;
+export const tetrisMini = `mini(\`[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]\`)._slow(16);
+`;
+
+export const tetrisHaskellH = `h(\`slow 16 $ "[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]"\`)
+`;
+export const tetrisHaskell = `slow 16 $ "[[e5 [b4 c5] d5 [c5 b4]]
+[a4 [a4 c5] e5 [d5 c5]]
+[b4 [~ c5] d5 e5]
+[c5 a4 a4 ~]
+[[~ d5] [~ f5] a5 [g5 f5]]
+[e5 [~ c5] e5 [d5 c5]]
+[b4 [b4 c5] d5 e5]
+[c5 a4 a4 ~]],
+[[e2 e3]*4]
+[[a2 a3]*4]
+[[g#2 g#3]*2 [e2 e3]*2]
+[a2 a3 a2 a3 a2 a3 b1 c2]
+[[d2 d3]*4]
+[[c2 c3]*4]
+[[b1 b2]*2 [e2 e3]*2]
+[[a1 a2]*4]"
+`;
+
+/*
+export const tetrisHaskell = `h(\`slow 16 $ "[[e5 [b4 c5] d5 [c5 b4]] [a4 [a4 c5] e5 [d5 c5]] [b4 [~ c5] d5 e5] [c5 a4 a4 ~] [[~ d5] [~ f5] a5 [g5 f5]] [e5 [~ c5] e5 [d5 c5]] [b4 [b4 c5] d5 e5] [c5 a4 a4 ~]], [[e2 e3]*4] [[a2 a3]*4] [[g#2 g#3]*2 [e2 e3]*2] [a2 a3 a2 a3 a2 a3 b1 c2] [[d2 d3]*4] [[c2 c3]*4] [[b1 b2]*2 [e2 e3]*2] [[a1 a2]*4]"\`)`;
+*/
+
 // "sequence('c3', 'eb3', sequence('g3', 'f3'))" //
 /* `sequence(
       stack('c4','eb4','g4'),
diff --git a/repl/src/types.d.ts b/repl/src/types.d.ts
index 6854f74e..8252d201 100644
--- a/repl/src/types.d.ts
+++ b/repl/src/types.d.ts
@@ -19,4 +19,5 @@ export declare interface Hap<T = any> {
 }
 export declare interface Pattern<T = any> {
   query: (span: TimeSpan) => Hap<T>[];
+  fmap: (v: T) => T;
 }
diff --git a/repl/src/useCycle.ts b/repl/src/useCycle.ts
index c25271a6..6e1ed5e7 100644
--- a/repl/src/useCycle.ts
+++ b/repl/src/useCycle.ts
@@ -47,16 +47,18 @@ function useCycle(props: UseCycleProps) {
       }, queryNextTime);
     }
     // schedule events for next cycle
-    events?.forEach((event) => {
-      Tone.Transport.schedule((time) => {
-        const toneEvent = {
-          time: event.part.begin.valueOf(),
-          duration: event.part.end.valueOf() - event.part.begin.valueOf(),
-          value: event.value,
-        };
-        onEvent(time, toneEvent);
-      }, event.part.begin.valueOf());
-    });
+    events
+      ?.filter((event) => event.part.begin.valueOf() === event.whole.begin.valueOf())
+      .forEach((event) => {
+        Tone.Transport.schedule((time) => {
+          const toneEvent = {
+            time: event.part.begin.valueOf(),
+            duration: event.whole.end.valueOf() - event.whole.begin.valueOf(),
+            value: event.value,
+          };
+          onEvent(time, toneEvent);
+        }, event.part.begin.valueOf());
+      });
   };
 
   useEffect(() => {
diff --git a/test/pattern.test.mjs b/test/pattern.test.mjs
index e2183b37..4aef0740 100644
--- a/test/pattern.test.mjs
+++ b/test/pattern.test.mjs
@@ -4,6 +4,9 @@ import { strict as assert } from 'assert';
 
 import {TimeSpan, Hap, Pattern, pure, stack, fastcat, slowcat, cat, sequence, polyrhythm} from "../strudel.mjs";
 
+const ts = (begin, end) => new TimeSpan(Fraction(begin), Fraction(end));
+const hap = (whole, part, value) => new Hap(whole, part, value)
+
 describe('TimeSpan', function() {
   describe('equals()', function() {
     it('Should be equal to the same value', function() {
@@ -99,6 +102,21 @@ describe('Pattern', function() {
   describe('_slow()', function () {
     it('Makes things slower', function () {
       assert.deepStrictEqual(pure("a")._slow(2).firstCycle[0], new Hap(new TimeSpan(Fraction(0),Fraction(2)), new TimeSpan(Fraction(0), Fraction(1)), "a"))
+
+      const pat = sequence(pure('c3'), pure('eb3')._slow(2)); // => try mini('c3 eb3/2') in repl
+      assert.deepStrictEqual(
+        pat.query(ts(0,1))[1],
+        hap(ts(0,1), ts(1/2,1), "eb3")
+      )
+      // the following test fails
+      /* assert.deepStrictEqual(
+        pat.query(ts(1,2))[1], undefined
+      ) */
+      // expecting [c3 eb3] [c3 ~]
+      // what happens [c3 eb3] [c3 eb3]
+      // notable examples:
+      // mini('[c3 g3]/2 eb3') always plays [c3 eb3]
+      // mini('eb3 [c3 g3]/2 ') always plays [c3 g3]
     })
   })  
   describe('_filterValues()', function () {