CCherry07
9 months ago
parent
7528d0fda4
commit
f3cea8ef0e
@ -1,17 +0,0 @@ |
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import { Computed as AlienComputed } from 'alien-signals'; |
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export function computed<T>(getter: (cachedValue?: T) => T): Computed<T> { |
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return new Computed<T>(getter); |
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} |
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export class Computed<T = any> extends AlienComputed { |
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constructor(getter: (cachedValue?: T) => T) { |
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super(getter); |
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} |
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get value(): T { |
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return this.get(); |
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} |
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peek(): T { |
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return this.currentValue; |
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} |
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} |
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@ -0,0 +1,3 @@ |
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export enum ReactiveFlags { |
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IS_REFERENCE = '__v_isReference', |
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} |
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@ -0,0 +1,212 @@ |
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import { createReactiveSystem, Dependency, Link, Subscriber, SubscriberFlags } from 'alien-signals'; |
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import { ReactiveFlags } from "./contents" |
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const { |
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link, |
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propagate, |
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endTracking, |
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startTracking, |
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updateDirtyFlag, |
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processComputedUpdate, |
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processEffectNotifications, |
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} = createReactiveSystem({ |
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updateComputed(computed: Computed) { |
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return computed.update(); |
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}, |
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notifyEffect(effect: Effect) { |
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effect.notify(); |
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return true; |
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}, |
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}); |
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|
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let activeSub: Subscriber | undefined = undefined; |
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let batchDepth = 0; |
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export function startBatch(): void { |
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++batchDepth; |
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} |
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export function endBatch(): void { |
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if (!--batchDepth) { |
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processEffectNotifications(); |
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} |
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} |
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export function signal<T>(): Signal<T | undefined>; |
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export function signal<T>(oldValue: T): Signal<T>; |
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export function signal<T>(oldValue?: T): Signal<T | undefined> { |
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return new Signal(oldValue); |
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} |
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export class Signal<T = any> implements Dependency { |
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public readonly [ReactiveFlags.IS_REFERENCE] = true |
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// Dependency fields
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subs: Link | undefined = undefined; |
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subsTail: Link | undefined = undefined; |
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constructor( |
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public currentValue: T |
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) { } |
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get(): T { |
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if (activeSub !== undefined) { |
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link(this, activeSub); |
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} |
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return this.currentValue; |
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} |
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|
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set(value: T): void { |
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if (this.currentValue !== value) { |
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this.currentValue = value; |
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const subs = this.subs; |
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if (subs !== undefined) { |
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propagate(subs); |
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if (!batchDepth) { |
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processEffectNotifications(); |
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} |
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} |
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} |
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} |
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value(): T { |
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return this.get(); |
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} |
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peek(): T { |
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return this.currentValue; |
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} |
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} |
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export function computed<T>(getter: () => T): Computed<T> { |
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return new Computed<T>(getter); |
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} |
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export class Computed<T = any> implements Subscriber, Dependency { |
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readonly [ReactiveFlags.IS_REFERENCE] = true |
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currentValue: T | undefined = undefined; |
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// Dependency fields
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subs: Link | undefined = undefined; |
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subsTail: Link | undefined = undefined; |
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// Subscriber fields
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deps: Link | undefined = undefined; |
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depsTail: Link | undefined = undefined; |
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flags: SubscriberFlags = SubscriberFlags.Computed | SubscriberFlags.Dirty; |
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constructor( |
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public getter: () => T |
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) { } |
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get(): T { |
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const flags = this.flags; |
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if (flags & (SubscriberFlags.PendingComputed | SubscriberFlags.Dirty)) { |
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processComputedUpdate(this, flags); |
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} |
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if (activeSub !== undefined) { |
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link(this, activeSub); |
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} |
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return this.currentValue!; |
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} |
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update(): boolean { |
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const prevSub = activeSub; |
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activeSub = this; |
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startTracking(this); |
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try { |
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const oldValue = this.currentValue; |
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const newValue = this.getter(); |
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if (oldValue !== newValue) { |
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this.currentValue = newValue; |
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return true; |
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} |
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return false; |
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} finally { |
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activeSub = prevSub; |
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endTracking(this); |
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} |
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} |
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peek(): T { |
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return this.currentValue!; |
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} |
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value(): Readonly<T> { |
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return this.get(); |
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} |
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} |
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export function effect<T>(fn: () => T): Effect<T> { |
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const e = new Effect(fn); |
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e.run(); |
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return e; |
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} |
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export class Effect<T = any> implements Subscriber { |
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readonly [ReactiveFlags.IS_REFERENCE] = true |
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// Subscriber fields
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deps: Link | undefined = undefined; |
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depsTail: Link | undefined = undefined; |
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flags: SubscriberFlags = SubscriberFlags.Effect; |
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constructor( |
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public fn: () => T |
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) { } |
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notify(): void { |
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const flags = this.flags; |
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if ( |
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flags & SubscriberFlags.Dirty |
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|| (flags & SubscriberFlags.PendingComputed && updateDirtyFlag(this, flags)) |
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) { |
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this.run(); |
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} |
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} |
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run(): T { |
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const prevSub = activeSub; |
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activeSub = this; |
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startTracking(this); |
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try { |
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return this.fn(); |
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} finally { |
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activeSub = prevSub; |
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endTracking(this); |
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} |
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} |
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stop(): void { |
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startTracking(this); |
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endTracking(this); |
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} |
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} |
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export function batch<T>(fn: () => T): T { |
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startBatch(); |
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try { |
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return fn(); |
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} finally { |
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endBatch(); |
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} |
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} |
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export function isSignal<T>(r: Signal<T> | unknown): r is Signal<T> |
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export function isSignal(r: any): r is Signal { |
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return r ? r[ReactiveFlags.IS_REFERENCE] === true : false |
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} |
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export type MaybeSignal<T = any> = |
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| T |
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| Signal<T> |
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export type MaybeSignalOrGetter<T = any> = MaybeSignal<T> | Computed<T> | (() => T) |
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export function unSignal<T>(signal: MaybeSignal<T> | Computed<T>): T { |
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return (isSignal(signal) ? signal.value : signal) as T; |
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} |
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export const isFunction = (val: unknown): val is Function => |
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typeof val === 'function' |
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export function toValue<T>(source: MaybeSignalOrGetter<T>): T { |
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return isFunction(source) ? source() : unSignal(source) |
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} |
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@ -1,3 +1,2 @@ |
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export * from "./computed"; |
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export * from "./signal"; |
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export * from "./core"; |
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export * from "./deepSignal"; |
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@ -1,26 +0,0 @@ |
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import { Signal as AlienSignal } from 'alien-signals'; |
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export function signal<T>(): Signal<T | undefined>; |
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export function signal<T>(oldValue: T): Signal<T>; |
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export function signal<T>(oldValue?: T): Signal<T | undefined> { |
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return new Signal(oldValue); |
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} |
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export class Signal<T = any> extends AlienSignal { |
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constructor( |
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currentValue: T |
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) { |
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super(currentValue); |
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} |
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get value(): T { |
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return this.get() |
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} |
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set value(value: T) { |
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this.set(value) |
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} |
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peek(): T { |
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return this.currentValue; |
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} |
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} |
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