add euclid

repl/krill-parser.js

@@ -262,7 +262,7 @@ function peg$parse(input, options) {
   var peg$f3 = function(sc) { sc.arguments_.alignment = "t"; return sc;};
   var peg$f4 = function(a) { return { weight: a} };
   var peg$f5 = function(a) { return { replicate: a  } };
-  var peg$f6 = function(p, s) { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s } } } };
+  var peg$f6 = function(p, s, r) { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s, rotation:r || 0 } } } };
   var peg$f7 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:a } } } };
   var peg$f8 = function(a) { return { operator : { type_: "stretch", arguments_ :{ amount:"1/"+a } } } };
   var peg$f9 = function(a) { return { operator : { type_: "fixed-step", arguments_ :{ amount:a } } } };
@@ -273,7 +273,7 @@ function peg$parse(input, options) {
   var peg$f14 = function(s) { return s; };
   var peg$f15 = function(s) { return { name: "struct", args: { sequence:s }}};
   var peg$f16 = function(s) { return { name: "target", args : { name:s}}};
-  var peg$f17 = function(p, s) { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}};
+  var peg$f17 = function(p, s, r) { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}};
   var peg$f18 = function(a) { return { name: "stretch", args :{ amount: a}}};
   var peg$f19 = function(a) { return { name: "shift", args :{ amount: "-"+a}}};
   var peg$f20 = function(a) { return { name: "shift", args :{ amount: a}}};
@@ -1022,7 +1022,7 @@ function peg$parse(input, options) {
   }
 
   function peg$parseslice_bjorklund() {
-    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;
+    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13;
 
     s0 = peg$currPos;
     if (input.charCodeAt(peg$currPos) === 40) {
@@ -1043,16 +1043,26 @@ function peg$parse(input, options) {
           s7 = peg$parsenumber();
           if (s7 !== peg$FAILED) {
             s8 = peg$parsews();
+            s9 = peg$parsecomma();
+            if (s9 === peg$FAILED) {
+              s9 = null;
+            }
+            s10 = peg$parsews();
+            s11 = peg$parsenumber();
+            if (s11 === peg$FAILED) {
+              s11 = null;
+            }
+            s12 = peg$parsews();
             if (input.charCodeAt(peg$currPos) === 41) {
-              s9 = peg$c17;
+              s13 = peg$c17;
               peg$currPos++;
             } else {
-              s9 = peg$FAILED;
+              s13 = peg$FAILED;
               if (peg$silentFails === 0) { peg$fail(peg$e24); }
             }
-            if (s9 !== peg$FAILED) {
+            if (s13 !== peg$FAILED) {
               peg$savedPos = s0;
-              s0 = peg$f6(s3, s7);
+              s0 = peg$f6(s3, s7, s11);
             } else {
               peg$currPos = s0;
               s0 = peg$FAILED;
@@ -1383,7 +1393,7 @@ function peg$parse(input, options) {
   }
 
   function peg$parsebjorklund() {
-    var s0, s1, s2, s3, s4, s5;
+    var s0, s1, s2, s3, s4, s5, s6, s7;
 
     s0 = peg$currPos;
     if (input.substr(peg$currPos, 6) === peg$c23) {
@@ -1400,8 +1410,13 @@ function peg$parse(input, options) {
         s4 = peg$parsews();
         s5 = peg$parseint();
         if (s5 !== peg$FAILED) {
+          s6 = peg$parsews();
+          s7 = peg$parseint();
+          if (s7 === peg$FAILED) {
+            s7 = null;
+          }
           peg$savedPos = s0;
-          s0 = peg$f17(s3, s5);
+          s0 = peg$f17(s3, s5, s7);
         } else {
           peg$currPos = s0;
           s0 = peg$FAILED;

repl/krill.pegjs

@@ -104,8 +104,8 @@ slice_weight =  "@" a:number
 slice_replicate = "!"a:number
   { return { replicate: a  } }
 
-slice_bjorklund = "(" ws p:number ws comma ws s:number ws")"
-  { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s } } } }
+slice_bjorklund = "(" ws p:number ws comma ws s:number ws comma? ws r:number? ws ")"
+  { return { operator : { type_: "bjorklund", arguments_ :{ pulse: p, step:s, rotation:r || 0 } } } }
 
 slice_slow = "/"a:number
   { return { operator : { type_: "stretch", arguments_ :{ amount:a } } } }
@@ -145,7 +145,7 @@ struct = "struct" ws s:sequence_or_operator
 target = "target" ws quote s:step quote
   { return { name: "target", args : { name:s}}}
 
-bjorklund = "euclid" ws p:int ws s:int
+bjorklund = "euclid" ws p:int ws s:int ws r:int?
   { return { name: "bjorklund", args :{ pulse: parseInt(p), step:parseInt(s) }}}
 
 slow = "slow" ws a:number

repl/package-lock.json

@@ -7,6 +7,7 @@
       "dependencies": {
         "@tonaljs/tonal": "^4.6.5",
         "@tonejs/piano": "^0.2.1",
+        "bjork": "^0.0.1",
         "chord-voicings": "^0.0.1",
         "codemirror": "^5.65.1",
         "estraverse": "^5.3.0",
@@ -4195,6 +4196,11 @@
         "node": ">=8"
       }
     },
+    "node_modules/bjork": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/bjork/-/bjork-0.0.1.tgz",
+      "integrity": "sha1-br1a3pkWSwvgMIeI1kaRQ9XJrZw="
+    },
     "node_modules/bl": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
@@ -15511,6 +15517,11 @@
       "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
       "dev": true
     },
+    "bjork": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/bjork/-/bjork-0.0.1.tgz",
+      "integrity": "sha1-br1a3pkWSwvgMIeI1kaRQ9XJrZw="
+    },
     "bl": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",

repl/package.json

@@ -13,6 +13,7 @@
   "dependencies": {
     "@tonaljs/tonal": "^4.6.5",
     "@tonejs/piano": "^0.2.1",
+    "bjork": "^0.0.1",
     "chord-voicings": "^0.0.1",
     "codemirror": "^5.65.1",
     "estraverse": "^5.3.0",

repl/src/euclid.mjs

@@ -0,0 +1,17 @@
+import { Pattern } from '../../strudel.mjs';
+import bjork from 'bjork';
+import { rotate } from '../../util.mjs';
+
+const euclid = (pulses, steps, rotation = 0) => {
+  const b = bjork(steps, pulses);
+  if (rotation) {
+    return rotate(b, -rotation);
+  }
+  return b;
+};
+
+Pattern.prototype.euclid = function (pulses, steps, rotation = 0) {
+  return this.struct(euclid(pulses, steps, rotation));
+};
+
+export default euclid;

repl/src/evaluate.ts

@@ -5,7 +5,8 @@ import './voicings';
 import './tonal.mjs';
 import './xen.mjs';
 import './tune.mjs';
-import './tune.mjs';
+import './euclid.mjs';
+import euclid from './euclid.mjs';
 import './pianoroll.mjs';
 import './draw.mjs';
 import * as uiHelpers from './ui.mjs';
@@ -36,7 +37,7 @@ hackLiteral(String, ['mini', 'm'], bootstrapped.mini); // comment out this line
 hackLiteral(String, ['pure', 'p'], bootstrapped.pure); // comment out this line if you panic
 
 // this will add everything to global scope, which is accessed by eval
-Object.assign(globalThis, bootstrapped, Tone, toneHelpers, voicingHelpers, drawHelpers, uiHelpers, { gist });
+Object.assign(globalThis, bootstrapped, Tone, toneHelpers, voicingHelpers, drawHelpers, uiHelpers, { gist, euclid });
 
 export const evaluate: any = async (code: string) => {
   const shapeshifted = shapeshifter(code); // transform syntactically correct js code to semantically usable code

repl/src/parse.ts

@@ -14,6 +14,8 @@ const applyOptions = (parent: any) => (pat: any, i: number) => {
       case 'stretch':
         const speed = new Fraction(operator.arguments_.amount).inverse().valueOf();
         return reify(pat).fast(speed);
+      case 'bjorklund':
+        return pat.euclid(operator.arguments_.pulse, operator.arguments_.step, operator.arguments_.rotation);
       // TODO: case 'fixed-step': "%"
     }
     console.warn(`operator "${operator.type_}" not implemented`);

repl/src/tunes.ts

@@ -543,3 +543,32 @@ stack(
   .fast(2 / 3)
   .tone(p.toDestination())
 )`;
+
+export const festivalOfFingers = `const chords = "<Cm7 Fm7 G7 F#7>";
+piano().then(p=>stack(
+  chords.voicings().struct("x(3,8,-1)").velocity(.5).off(1/7,x=>x.transpose(12).velocity(.2)),
+  chords.rootNotes(2).struct("x(4,8,-2)"),
+  chords.rootNotes(4)
+  .scale(slowcat('C minor','F dorian','G dorian','F# mixolydian'))
+  .struct("x(3,8,-2)".fast(2))
+  .scaleTranspose("0 4 0 6".early(".125 .5")).layer(scaleTranspose("0,<2 [4,6] [5,7]>/4"))
+).slow(2)
+             //.pianoroll()
+ .velocity(sine.struct("x*8").add(3/5).mul(2/5).fast(8))
+ .tone(p.chain(out())))`;
+
+export const festivalOfFingers2 = `const chords =       "<Cm7       Fm7        G7         F#7            >";
+ const scales = slowcat('C minor','F dorian','G dorian','F# mixolydian')
+ piano().then(p=>stack(
+   chords.voicings().struct("x(3,8,-1)").velocity(.5).off(1/7,x=>x.transpose(12).velocity(.2)),
+   chords.rootNotes(2).struct("x(4,8)"),
+   chords.rootNotes(4)
+   .scale(scales)
+   .struct("x(3,8,-2)".fast(2))
+   .scaleTranspose("0 4 0 6".early(".125 .5")).layer(scaleTranspose("0,<2 [4,6] [5,7]>/3"))
+ ).slow(2).transpose(-1)            
+  .legato(cosine.struct("x*8").add(4/5).mul(4/5).fast(8))
+  .velocity(sine.struct("x*8").add(3/5).mul(2/5).fast(8))
+  // .pianoroll()
+  .tone(p.chain(out())).fast(3/4)
+ )`;

repl/src/tutorial/tutorial.mdx

@@ -180,13 +180,13 @@ In essence, the `x!n` is like a shortcut for `[x*n]@n`.
 
 Compared to [tidal mini notation](https://tidalcycles.org/docs/patternlib/tutorials/mini_notation/), the following mini notation features are missing from Strudel:
 
-- Tie symbols "\_"
-- Euclidean algorithm "c3(3,2,1)"
-- feet marking "."
-- random choice "|"
-- Random removal "?"
-- Polymetric sequences "{ ... }"
-- Fixed steps using "%"
+- [x] Euclidean algorithm "c3(3,2,1)" TODO: document
+- [ ] Tie symbols "\_"
+- [ ] feet marking "."
+- [ ] random choice "|"
+- [ ] Random removal "?"
+- [ ] Polymetric sequences "{ ... }"
+- [ ] Fixed steps using "%"
 
 <br />
 

util.mjs

@@ -39,3 +39,6 @@ export const getPlayableNoteValue = (event) => {
   }
   return note;
 };
+
+// rotate array by n steps (to the left)
+export const rotate = (arr, n) => arr.slice(n).concat(arr.slice(0, n));