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Add stateful flag to hap, add sketch of resolveState to hap. Also firstCycle now strips the context by default.

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This commit is contained in:
alex 2022-02-26 23:45:53 +00:00
parent aeb51a157f
commit 34872b3a02
1 changed files with 25 additions and 4 deletions
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29
strudel.mjs
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@ -175,11 +175,15 @@ class Hap {
The context is to store a list of source code locations causing the event The context is to store a list of source code locations causing the event
*/ */
constructor(whole, part, value, context = {}) { constructor(whole, part, value, context = {}, stateful = false) {
this.whole = whole this.whole = whole
this.part = part this.part = part
this.value = value this.value = value
this.context = context this.context = context
this.stateful = stateful
if (stateful) {
assert(typeof this.value === "function", "Stateful values must be functions");
}
} }
withSpan(func) { withSpan(func) {
@ -199,6 +203,15 @@ class Hap {
return (this.whole != undefined) && (this.whole.begin.equals(this.part.begin)) return (this.whole != undefined) && (this.whole.begin.equals(this.part.begin))
} }
resolveState(state) {
if (this.stateful && this.hasOnset()) {
const func = this.value
[newState, newValue] = func(state)
return [newState, this.withValue(() => newValue)]
}
return [state, this]
}
spanEquals(other) { spanEquals(other) {
return((this.whole == undefined && other.whole == undefined) return((this.whole == undefined && other.whole == undefined)
|| this.whole.equals(other.whole) || this.whole.equals(other.whole)
@ -316,6 +329,10 @@ class Pattern {
return this._withEvent(event => event.setContext(func(event.context))) return this._withEvent(event => event.setContext(func(event.context)))
} }
_stripContext() {
return this._withEvent(event => event.setContext({}))
}
withLocation(location) { withLocation(location) {
return this._withContext((context) => { return this._withContext((context) => {
const locations = (context.locations || []).concat([location]) const locations = (context.locations || []).concat([location])
@ -372,7 +389,7 @@ class Pattern {
return flatten(event_funcs.map(event_func => removeUndefineds(event_vals.map(event_val => apply(event_func, event_val))))) return flatten(event_funcs.map(event_func => removeUndefineds(event_vals.map(event_val => apply(event_func, event_val)))))
} }
return new Pattern(query) return new Pattern(query)
} }
appBoth(pat_val) { appBoth(pat_val) {
// Tidal's <*> // Tidal's <*>
@ -433,8 +450,12 @@ class Pattern {
return new Pattern(query) return new Pattern(query)
} }
get firstCycle() { firstCycle(with_context=false) {
return this.query(new State(new TimeSpan(Fraction(0), Fraction(1)))) var self = this
if (!with_context) {
self = self._stripContext()
}
return self.query(new State(new TimeSpan(Fraction(0), Fraction(1))))
} }
_sortEventsByPart() { _sortEventsByPart() {