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import { extend, isArray, isIntegerKey, isMap } from '@vue/shared'
import { EffectScope, recordEffectScope } from './effectScope'
import {
createDep,
Dep,
finalizeDepMarkers,
initDepMarkers,
newTracked,
wasTracked
} from './dep'
import { ComputedRefImpl } from './computed'
// The main WeakMap that stores {target -> key -> dep} connections.
// Conceptually, it's easier to think of a dependency as a Dep class
// which maintains a Set of subscribers, but we simply store them as
// raw Sets to reduce memory overhead.
type KeyToDepMap = Map<any, Dep>
const targetMap = new WeakMap<any, KeyToDepMap>()
// The number of effects currently being tracked recursively.
let effectTrackDepth = 0
export let trackOpBit = 1
/**
* The bitwise track markers support at most 30 levels of recursion.
* This value is chosen to enable modern JS engines to use a SMI on all platforms.
* When recursion depth is greater, fall back to using a full cleanup.
*/
const maxMarkerBits = 30
export type EffectScheduler = (...args: any[]) => any
export type DebuggerEvent = {
effect: ReactiveEffect
} & DebuggerEventExtraInfo
export type DebuggerEventExtraInfo = {
target: object
type: TrackOpTypes | TriggerOpTypes
key: any
newValue?: any
oldValue?: any
oldTarget?: Map<any, any> | Set<any>
}
export let activeEffect: ReactiveEffect | undefined
export const ITERATE_KEY = Symbol(__DEV__ ? 'iterate' : '')
export const MAP_KEY_ITERATE_KEY = Symbol(__DEV__ ? 'Map key iterate' : '')
export class ReactiveEffect<T = any> {
active = true
deps: Dep[] = []
parent: ReactiveEffect | undefined = undefined
/**
* Can be attached after creation
* @internal
*/
computed?: ComputedRefImpl<T>
/**
* @internal
*/
allowRecurse?: boolean
/**
* @internal
*/
private deferStop?: boolean
onStop?: () => void
// dev only
onTrack?: (event: DebuggerEvent) => void
// dev only
onTrigger?: (event: DebuggerEvent) => void
constructor(
public fn: () => T,
public scheduler: EffectScheduler | null = null,
scope?: EffectScope
) {
recordEffectScope(this, scope)
}
run() {
if (!this.active) {
return this.fn()
}
let parent: ReactiveEffect | undefined = activeEffect
let lastShouldTrack = shouldTrack
while (parent) {
Iif (parent === this) {
return
}
parent = parent.parent
}
try {
this.parent = activeEffect
activeEffect = this
shouldTrack = true
trackOpBit = 1 << ++effectTrackDepth
if (effectTrackDepth <= maxMarkerBits) {
initDepMarkers(this)
} else {
cleanupEffect(this)
}
return this.fn()
} finally {
if (effectTrackDepth <= maxMarkerBits) {
finalizeDepMarkers(this)
}
trackOpBit = 1 << --effectTrackDepth
activeEffect = this.parent
shouldTrack = lastShouldTrack
this.parent = undefined
if (this.deferStop) {
this.stop()
}
}
}
stop() {
// stopped while running itself - defer the cleanup
if (activeEffect === this) {
this.deferStop = true
} else if (this.active) {
cleanupEffect(this)
if (this.onStop) {
this.onStop()
}
this.active = false
}
}
}
function cleanupEffect(effect: ReactiveEffect) {
const { deps } = effect
if (deps.length) {
for (let i = 0; i < deps.length; i++) {
deps[i].delete(effect)
}
deps.length = 0
}
}
export interface DebuggerOptions {
onTrack?: (event: DebuggerEvent) => void
onTrigger?: (event: DebuggerEvent) => void
}
export interface ReactiveEffectOptions extends DebuggerOptions {
lazy?: boolean
scheduler?: EffectScheduler
scope?: EffectScope
allowRecurse?: boolean
onStop?: () => void
}
export interface ReactiveEffectRunner<T = any> {
(): T
effect: ReactiveEffect
}
/**
* Registers the given function to track reactive updates.
*
* The given function will be run once immediately. Every time any reactive
* property that's accessed within it gets updated, the function will run again.
*
* @param fn The function that will track reactive updates.
* @param options Allows to control the effect's behaviour.
* @returns A runner that can be used to control the effect after creation.
*/
export function effect<T = any>(
fn: () => T,
options?: ReactiveEffectOptions
): ReactiveEffectRunner {
if ((fn as ReactiveEffectRunner).effect) {
fn = (fn as ReactiveEffectRunner).effect.fn
}
const _effect = new ReactiveEffect(fn)
if (options) {
extend(_effect, options)
Iif (options.scope) recordEffectScope(_effect, options.scope)
}
if (!options || !options.lazy) {
_effect.run()
}
const runner = _effect.run.bind(_effect) as ReactiveEffectRunner
runner.effect = _effect
return runner
}
/**
* Stops the effect associated with the given runner.
*
* @param runner Association with the effect to stop tracking.
*/
export function stop(runner: ReactiveEffectRunner) {
runner.effect.stop()
}
export let shouldTrack = true
const trackStack: boolean[] = []
/**
* Temporarily pauses tracking.
*/
export function pauseTracking() {
trackStack.push(shouldTrack)
shouldTrack = false
}
/**
* Re-enables effect tracking (if it was paused).
*/
export function enableTracking() {
trackStack.push(shouldTrack)
shouldTrack = true
}
/**
* Resets the previous global effect tracking state.
*/
export function resetTracking() {
const last = trackStack.pop()
shouldTrack = last === undefined ? true : last
}
/**
* Tracks access to a reactive property.
*
* This will check which effect is running at the moment and record it as dep
* which records all effects that depend on the reactive property.
*
* @param target Object holding the reactive property.
* @param type Defines the type of access to the reactive property.
* @param key Identifier of the reactive property to track.
*/
export function track(target: object, type: TrackOpTypes, key: unknown) {
if (shouldTrack && activeEffect) {
let depsMap = targetMap.get(target)
if (!depsMap) {
targetMap.set(target, (depsMap = new Map()))
}
let dep = depsMap.get(key)
if (!dep) {
depsMap.set(key, (dep = createDep()))
}
const eventInfo = __DEV__
? { effect: activeEffect, target, type, key }
: undefined
trackEffects(dep, eventInfo)
}
}
export function trackEffects(
dep: Dep,
debuggerEventExtraInfo?: DebuggerEventExtraInfo
) {
let shouldTrack = false
if (effectTrackDepth <= maxMarkerBits) {
if (!newTracked(dep)) {
dep.n |= trackOpBit // set newly tracked
shouldTrack = !wasTracked(dep)
}
} else {
// Full cleanup mode.
shouldTrack = !dep.has(activeEffect!)
}
if (shouldTrack) {
dep.add(activeEffect!)
activeEffect!.deps.push(dep)
if (__DEV__ && activeEffect!.onTrack) {
activeEffect!.onTrack({
effect: activeEffect!,
...debuggerEventExtraInfo!
})
}
}
}
/**
* Finds all deps associated with the target (or a specific property) and
* triggers the effects stored within.
*
* @param target The reactive object.
* @param type Defines the type of the operation that needs to trigger effects.
* @param key Can be used to target a specific reactive property in the target object.
*/
export function trigger(
target: object,
type: TriggerOpTypes,
key?: unknown,
newValue?: unknown,
oldValue?: unknown,
oldTarget?: Map<unknown, unknown> | Set<unknown>
) {
const depsMap = targetMap.get(target)
if (!depsMap) {
// never been tracked
return
}
let deps: (Dep | undefined)[] = []
if (type === TriggerOpTypes.CLEAR) {
// collection being cleared
// trigger all effects for target
deps = [...depsMap.values()]
} else if (key === 'length' && isArray(target)) {
const newLength = Number(newValue)
depsMap.forEach((dep, key) => {
if (key === 'length' || key >= newLength) {
deps.push(dep)
}
})
} else {
// schedule runs for SET | ADD | DELETE
if (key !== void 0) {
deps.push(depsMap.get(key))
}
// also run for iteration key on ADD | DELETE | Map.SET
switch (type) {
case TriggerOpTypes.ADD:
if (!isArray(target)) {
deps.push(depsMap.get(ITERATE_KEY))
if (isMap(target)) {
deps.push(depsMap.get(MAP_KEY_ITERATE_KEY))
}
} else if (isIntegerKey(key)) {
// new index added to array -> length changes
deps.push(depsMap.get('length'))
}
break
case TriggerOpTypes.DELETE:
if (!isArray(target)) {
deps.push(depsMap.get(ITERATE_KEY))
if (isMap(target)) {
deps.push(depsMap.get(MAP_KEY_ITERATE_KEY))
}
}
break
case TriggerOpTypes.SET:
if (isMap(target)) {
deps.push(depsMap.get(ITERATE_KEY))
}
break
}
}
const eventInfo = __DEV__
? { target, type, key, newValue, oldValue, oldTarget }
: undefined
if (deps.length === 1) {
if (deps[0]) {
if (__DEV__) {
triggerEffects(deps[0], eventInfo)
} else E{
triggerEffects(deps[0])
}
}
} else {
const effects: ReactiveEffect[] = []
for (const dep of deps) {
if (dep) {
effects.push(...dep)
}
}
if (__DEV__) {
triggerEffects(createDep(effects), eventInfo)
} else E{
triggerEffects(createDep(effects))
}
}
}
export function triggerEffects(
dep: Dep | ReactiveEffect[],
debuggerEventExtraInfo?: DebuggerEventExtraInfo
) {
// spread into array for stabilization
const effects = isArray(dep) ? dep : [...dep]
for (const effect of effects) {
if (effect.computed) {
triggerEffect(effect, debuggerEventExtraInfo)
}
}
for (const effect of effects) {
if (!effect.computed) {
triggerEffect(effect, debuggerEventExtraInfo)
}
}
}
function triggerEffect(
effect: ReactiveEffect,
debuggerEventExtraInfo?: DebuggerEventExtraInfo
) {
if (effect !== activeEffect || effect.allowRecurse) {
if (__DEV__ && effect.onTrigger) {
effect.onTrigger(extend({ effect }, debuggerEventExtraInfo))
}
if (effect.scheduler) {
effect.scheduler()
} else {
effect.run()
}
}
}
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