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base for a cached sequence

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This commit is contained in:
Raphaël Forment
2023-08-15 11:32:50 +02:00
parent 79ce0a4160
commit 01fd9bd4a1
1 changed files with 27 additions and 18 deletions
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41
src/API.ts
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@ -3,7 +3,7 @@ import { scale } from "./Scales";
import { tryEvaluate } from "./Evaluator"; import { tryEvaluate } from "./Evaluator";
import { MidiConnection } from "./IO/MidiConnection"; import { MidiConnection } from "./IO/MidiConnection";
import { DrunkWalk } from "./Utils/Drunk"; import { DrunkWalk } from "./Utils/Drunk";
import { Pitch, Chord, Rest, Event, Start, cachedStart } from "zifferjs"; import { Pitch, Chord, Rest, Event, Start, cachedStart, pattern } from "zifferjs";
import { import {
superdough, superdough,
samples, samples,
@ -13,6 +13,13 @@ import {
} from "superdough"; } from "superdough";
import { LRUCache } from 'lru-cache'; import { LRUCache } from 'lru-cache';
interface Pattern<T> {
pattern: any[];
options: {
[key: string]: T;
};
}
const cache = new LRUCache({max: 1000, ttl: 1000 * 60 * 5}); const cache = new LRUCache({max: 1000, ttl: 1000 * 60 * 5});
/** /**
@ -426,7 +433,7 @@ export class UserAPI {
return btoa(JSON.stringify(pattern)); return btoa(JSON.stringify(pattern));
} }
sequence(input: any[]) { seq(...input: any[]) {
/** /**
* Returns a value in a sequence stored using an LRU Cache. * Returns a value in a sequence stored using an LRU Cache.
* The sequence is stored in the cache with an hash identifier * The sequence is stored in the cache with an hash identifier
@ -440,25 +447,27 @@ export class UserAPI {
* containing options for the sequence function. * containing options for the sequence function.
* @returns A value in a sequence stored using an LRU Cache * @returns A value in a sequence stored using an LRU Cache
*/ */
const default_options: object = { index: 0 }
if (cache.has(this._sequence_key_generator(input))) {
let sequence = cache.get(this._sequence_key_generator(input)) as Pattern<any>;
sequence.options.index += 1;
cache.set(this._sequence_key_generator(input), sequence);
return sequence.pattern[
sequence.options.index % sequence.pattern.length
];
} else {
let pattern_options = { index: 0 };
if (typeof input[input.length - 1] === "object") { if (typeof input[input.length - 1] === "object") {
const pattern_options: object = { pattern_options = { ...input.pop(), ...pattern_options as object };
...input.pop(),
...default_options as object
};
} else {
const pattern_options = default_options;
} }
const sequence_key = this._sequence_key_generator(input); cache.set(this._sequence_key_generator(input), {
if (cache.has(sequence_key)) { pattern: input as any[],
return cache.get(sequence_key);
} else {
cache.set(sequence_key, {
pattern: input,
options: pattern_options options: pattern_options
}); });
return cache.get(this._sequence_key_generator(input));
} }
return cache.get(sequence_key);
} }
pick<T>(...array: T[]): T { pick<T>(...array: T[]): T {