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import { warn } from './warning'
export let activeEffectScope: EffectScope | undefined
export class EffectScope {
/**
* @internal
*/
private _active = true
/**
* @internal
*/
effects: ReactiveEffect[] = []
/**
* @internal
*/
cleanups: (() => void)[] = []
private _isPaused = false
/**
* only assigned by undetached scope
* @internal
*/
parent: EffectScope | undefined
/**
* record undetached scopes
* @internal
*/
scopes: EffectScope[] | undefined
/**
* track a child scope's index in its parent's scopes array for optimized
* removal
* @internal
*/
private index: number | undefined
constructor(public detached = false) {
this.parent = activeEffectScope
if (!detached && activeEffectScope) {
this.index =
(activeEffectScope.scopes || (activeEffectScope.scopes = [])).push(
this,
) - 1
}
}
get active(): boolean {
return this._active
}
pause(): void {
if (this._active) {
this._isPaused = true
let i, l
if (this.scopes) {
for (i = 0, l = this.scopes.length; i < l; i++) {
this.scopes[i].pause()
}
}
for (i = 0, l = this.effects.length; i < l; i++) {
this.effects[i].pause()
}
}
}
/**
* Resumes the effect scope, including all child scopes and effects.
*/
resume(): void {
if (this._active) {
if (this._isPaused) {
this._isPaused = false
let i, l
if (this.scopes) {
for (i = 0, l = this.scopes.length; i < l; i++) {
this.scopes[i].resume()
}
}
for (i = 0, l = this.effects.length; i < l; i++) {
this.effects[i].resume()
}
}
}
}
run<T>(fn: () => T): T | undefined {
if (this._active) {
const currentEffectScope = activeEffectScope
try {
activeEffectScope = this
return fn()
} finally {
activeEffectScope = currentEffectScope
}
} else if (__DEV__) {
warn(`cannot run an inactive effect scope.`)
}
}
/**
* This should only be called on non-detached scopes
* @internal
*/
on(): void {
activeEffectScope = this
}
/**
* This should only be called on non-detached scopes
* @internal
*/
off(): void {
activeEffectScope = this.parent
}
stop(fromParent?: boolean): void {
if (this._active) {
let i, l
for (i = 0, l = this.effects.length; i < l; i++) {
this.effects[i].stop()
}
for (i = 0, l = this.cleanups.length; i < l; i++) {
this.cleanups[i]()
}
if (this.scopes) {
for (i = 0, l = this.scopes.length; i < l; i++) {
this.scopes[i].stop(true)
}
}
// nested scope, dereference from parent to avoid memory leaks
if (!this.detached && this.parent && !fromParent) {
// optimized O(1) removal
const last = this.parent.scopes!.pop()
if (last && last !== this) {
this.parent.scopes![this.index!] = last
last.index = this.index!
}
}
this.parent = undefined
this._active = false
}
}
}
/**
* Creates an effect scope object which can capture the reactive effects (i.e.
* computed and watchers) created within it so that these effects can be
* disposed together. For detailed use cases of this API, please consult its
* corresponding {@link https://github.com/vuejs/rfcs/blob/master/active-rfcs/0041-reactivity-effect-scope.md | RFC}.
*
* @param detached - Can be used to create a "detached" effect scope.
* @see {@link https://vuejs.org/api/reactivity-advanced.html#effectscope}
*/
export function effectScope(detached?: boolean): EffectScope {
return new EffectScope(detached)
}
/**
* Returns the current active effect scope if there is one.
*
* @see {@link https://vuejs.org/api/reactivity-advanced.html#getcurrentscope}
*/
export function getCurrentScope(): EffectScope | undefined {
return activeEffectScope
}
/**
* Registers a dispose callback on the current active effect scope. The
* callback will be invoked when the associated effect scope is stopped.
*
* @param fn - The callback function to attach to the scope's cleanup.
* @see {@link https://vuejs.org/api/reactivity-advanced.html#onscopedispose}
*/
export function onScopeDispose(fn: () => void, failSilently = false): void {
if (activeEffectScope) {
activeEffectScope.cleanups.push(fn)
} else if (__DEV__ && !failSilently) {
warn(
`onScopeDispose() is called when there is no active effect scope` +
` to be associated with.`,
)
}
}
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