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import type { ComputedRefImpl } from './computed'
import { type TrackOpTypes, TriggerOpTypes } from './constants'
import {
type DebuggerEventExtraInfo,
EffectFlags,
type Subscriber,
activeSub,
endBatch,
shouldTrack,
startBatch,
} from './effect'
/**
* Incremented every time a reactive change happens
* This is used to give computed a fast path to avoid re-compute when nothing
* has changed.
*/
export let globalVersion = 0
/**
* Represents a link between a source (Dep) and a subscriber (Effect or Computed).
* Deps and subs have a many-to-many relationship - each link between a
* dep and a sub is represented by a Link instance.
*
* A Link is also a node in two doubly-linked lists - one for the associated
* sub to track all its deps, and one for the associated dep to track all its
* subs.
*
* @internal
*/
export class Link {
/**
* - Before each effect run, all previous dep links' version are reset to -1
* - During the run, a link's version is synced with the source dep on access
* - After the run, links with version -1 (that were never used) are cleaned
* up
*/
version: number
/**
* Pointers for doubly-linked lists
*/
nextDep?: Link
prevDep?: Link
nextSub?: Link
prevSub?: Link
prevActiveLink?: Link
constructor(
public sub: Subscriber,
public dep: Dep,
) {
this.version = dep.version
this.nextDep =
this.prevDep =
this.nextSub =
this.prevSub =
this.prevActiveLink =
undefined
}
}
/**
* @internal
*/
export class Dep {
version = 0
/**
* Link between this dep and the current active effect
*/
activeLink?: Link = undefined
/**
* Doubly linked list representing the subscribing effects (tail)
*/
subs?: Link = undefined
/**
* Doubly linked list representing the subscribing effects (head)
* DEV only, for invoking onTrigger hooks in correct order
*/
subsHead?: Link
/**
* For object property deps cleanup
*/
target?: unknown = undefined
map?: KeyToDepMap = undefined
key?: unknown = undefined
/**
* Subscriber counter
*/
sc: number = 0
constructor(public computed?: ComputedRefImpl | undefined) {
if (__DEV__) {
this.subsHead = undefined
}
}
track(debugInfo?: DebuggerEventExtraInfo): Link | undefined {
if (!activeSub || !shouldTrack || activeSub === this.computed) {
return
}
let link = this.activeLink
if (link === undefined || link.sub !== activeSub) {
link = this.activeLink = new Link(activeSub, this)
// add the link to the activeEffect as a dep (as tail)
if (!activeSub.deps) {
activeSub.deps = activeSub.depsTail = link
} else {
link.prevDep = activeSub.depsTail
activeSub.depsTail!.nextDep = link
activeSub.depsTail = link
}
addSub(link)
} else if (link.version === -1) {
// reused from last run - already a sub, just sync version
link.version = this.version
// If this dep has a next, it means it's not at the tail - move it to the
// tail. This ensures the effect's dep list is in the order they are
// accessed during evaluation.
if (link.nextDep) {
const next = link.nextDep
next.prevDep = link.prevDep
if (link.prevDep) {
link.prevDep.nextDep = next
}
link.prevDep = activeSub.depsTail
link.nextDep = undefined
activeSub.depsTail!.nextDep = link
activeSub.depsTail = link
// this was the head - point to the new head
if (activeSub.deps === link) {
activeSub.deps = next
}
}
}
if (__DEV__ && activeSub.onTrack) {
activeSub.onTrack(
extend(
{
effect: activeSub,
},
debugInfo,
),
)
}
return link
}
trigger(debugInfo?: DebuggerEventExtraInfo): void {
this.version++
globalVersion++
this.notify(debugInfo)
}
notify(debugInfo?: DebuggerEventExtraInfo): void {
startBatch()
try {
if (__DEV__) {
// subs are notified and batched in reverse-order and then invoked in
// original order at the end of the batch, but onTrigger hooks should
// be invoked in original order here.
for (let head = this.subsHead; head; head = head.nextSub) {
if (head.sub.onTrigger && !(head.sub.flags & EffectFlags.NOTIFIED)) {
head.sub.onTrigger(
extend(
{
effect: head.sub,
},
debugInfo,
),
)
}
}
}
for (let link = this.subs; link; link = link.prevSub) {
if (link.sub.notify()) {
// if notify() returns `true`, this is a computed. Also call notify
// on its dep - it's called here instead of inside computed's notify
// in order to reduce call stack depth.
;(link.sub as ComputedRefImpl).dep.notify()
}
}
} finally {
endBatch()
}
}
}
function addSub(link: Link) {
link.dep.sc++
if (link.sub.flags & EffectFlags.TRACKING) {
const computed = link.dep.computed
// computed getting its first subscriber
// enable tracking + lazily subscribe to all its deps
if (computed && !link.dep.subs) {
computed.flags |= EffectFlags.TRACKING | EffectFlags.DIRTY
for (let l = computed.deps; l; l = l.nextDep) {
addSub(l)
}
}
const currentTail = link.dep.subs
if (currentTail !== link) {
link.prevSub = currentTail
if (currentTail) currentTail.nextSub = link
}
if (__DEV__ && link.dep.subsHead === undefined) {
link.dep.subsHead = link
}
link.dep.subs = link
}
}
// 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 Maps to reduce memory overhead.
type KeyToDepMap = Map<any, Dep>
export const targetMap: WeakMap<object, KeyToDepMap> = new WeakMap()
export const ITERATE_KEY: unique symbol = Symbol(
__DEV__ ? 'Object iterate' : '',
)
export const MAP_KEY_ITERATE_KEY: unique symbol = Symbol(
__DEV__ ? 'Map keys iterate' : '',
)
export const ARRAY_ITERATE_KEY: unique symbol = Symbol(
__DEV__ ? 'Array iterate' : '',
)
/**
* 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): void {
if (shouldTrack && activeSub) {
let depsMap = targetMap.get(target)
if (!depsMap) {
targetMap.set(target, (depsMap = new Map()))
}
let dep = depsMap.get(key)
if (!dep) {
depsMap.set(key, (dep = new Dep()))
dep.target = target
dep.map = depsMap
dep.key = key
}
if (__DEV__) {
dep.track({
target,
type,
key,
})
} else {
dep.track()
}
}
}
/**
* 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>,
): void {
const depsMap = targetMap.get(target)
if (!depsMap) {
// never been tracked
globalVersion++
return
}
const run = (dep: Dep | undefined) => {
if (dep) {
if (__DEV__) {
dep.trigger({
target,
type,
key,
newValue,
oldValue,
oldTarget,
})
} else {
dep.trigger()
}
}
}
startBatch()
if (type === TriggerOpTypes.CLEAR) {
// collection being cleared
// trigger all effects for target
depsMap.forEach(run)
} else {
const targetIsArray = isArray(target)
const isArrayIndex = targetIsArray && isIntegerKey(key)
if (targetIsArray && key === 'length') {
const newLength = Number(newValue)
depsMap.forEach((dep, key) => {
if (
key === 'length' ||
key === ARRAY_ITERATE_KEY ||
(!isSymbol(key) && key >= newLength)
) {
run(dep)
}
})
} else {
// schedule runs for SET | ADD | DELETE
if (key !== void 0) {
run(depsMap.get(key))
}
// schedule ARRAY_ITERATE for any numeric key change (length is handled above)
if (isArrayIndex) {
run(depsMap.get(ARRAY_ITERATE_KEY))
}
// also run for iteration key on ADD | DELETE | Map.SET
switch (type) {
case TriggerOpTypes.ADD:
if (!targetIsArray) {
run(depsMap.get(ITERATE_KEY))
if (isMap(target)) {
run(depsMap.get(MAP_KEY_ITERATE_KEY))
}
} else if (isArrayIndex) {
// new index added to array -> length changes
run(depsMap.get('length'))
}
break
case TriggerOpTypes.DELETE:
if (!targetIsArray) {
run(depsMap.get(ITERATE_KEY))
if (isMap(target)) {
run(depsMap.get(MAP_KEY_ITERATE_KEY))
}
}
break
case TriggerOpTypes.SET:
if (isMap(target)) {
run(depsMap.get(ITERATE_KEY))
}
break
}
}
}
endBatch()
}
export function getDepFromReactive(
object: any,
key: string | number | symbol,
): Dep | undefined {
const depMap = targetMap.get(object)
return depMap && depMap.get(key)
}
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