Stefan Hacker
63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.comp = exports.val = exports.Computed = exports.Value = void 0;
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const fanout_1 = require("./fanout");
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const NO_CACHE = Symbol();
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class Value extends fanout_1.FanOut {
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constructor(value) {
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super();
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/** ----------------------------------------------------- {@link SyncStore} */
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this.subscribe = (cb) => this.listen(cb);
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this.getSnapshot = () => this.value;
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this.value = value;
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}
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next(value, force = false) {
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if (!force && this.value === value)
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return;
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this.value = value;
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this.emit();
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}
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}
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exports.Value = Value;
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class Computed extends fanout_1.FanOut {
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constructor(deps, compute) {
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super();
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this.deps = deps;
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this.compute = compute;
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this.cache = NO_CACHE;
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/** ----------------------------------------------------- {@link SyncStore} */
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this.subscribe = (cb) => this.listen(cb);
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this.getSnapshot = () => this._comp();
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const subs = (this.subs = []);
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const length = deps.length;
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for (let i = 0; i < length; i++) {
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const dep = deps[i];
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const sub = dep.listen(() => {
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this.cache = NO_CACHE;
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this.emit();
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});
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subs.push(sub);
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}
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}
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_comp() {
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const cached = this.cache;
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if (cached !== NO_CACHE)
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return cached;
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return (this.cache = this.compute(this.deps.map((dep) => dep.getSnapshot())));
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}
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/** ----------------------------------------------------- {@link SyncValue} */
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get value() {
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return this._comp();
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}
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/** ---------------------------------------------------- {@link Disposable} */
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dispose() {
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for (const sub of this.subs)
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sub();
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}
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}
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exports.Computed = Computed;
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const val = (initial) => new Value(initial);
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exports.val = val;
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const comp = (deps, compute) => new Computed(deps, compute);
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exports.comp = comp;
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