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import { NOOP, isArray } from '@vue/shared'
import { type ComponentInternalInstance, getComponentName } from './component'
export enum SchedulerJobFlags {
QUEUED = 1 << 0,
PRE = 1 << 1,
/**
* Indicates whether the effect is allowed to recursively trigger itself
* when managed by the scheduler.
*
* By default, a job cannot trigger itself because some built-in method calls,
* e.g. Array.prototype.push actually performs reads as well (#1740) which
* can lead to confusing infinite loops.
* The allowed cases are component update functions and watch callbacks.
* Component update functions may update child component props, which in turn
* trigger flush: "pre" watch callbacks that mutates state that the parent
* relies on (#1801). Watch callbacks doesn't track its dependencies so if it
* triggers itself again, it's likely intentional and it is the user's
* responsibility to perform recursive state mutation that eventually
* stabilizes (#1727).
*/
ALLOW_RECURSE = 1 << 2,
DISPOSED = 1 << 3,
}
export interface SchedulerJob extends Function {
id?: number
/**
* flags can technically be undefined, but it can still be used in bitwise
* operations just like 0.
*/
flags?: SchedulerJobFlags
/**
* Attached by renderer.ts when setting up a component's render effect
* Used to obtain component information when reporting max recursive updates.
*/
i?: ComponentInternalInstance
}
export type SchedulerJobs = SchedulerJob | SchedulerJob[]
let isFlushing = false
let isFlushPending = false
const queue: SchedulerJob[] = []
let flushIndex = 0
const pendingPostFlushCbs: SchedulerJob[] = []
let activePostFlushCbs: SchedulerJob[] | null = null
let postFlushIndex = 0
const resolvedPromise = /*@__PURE__*/ Promise.resolve() as Promise<any>
let currentFlushPromise: Promise<void> | null = null
const RECURSION_LIMIT = 100
type CountMap = Map<SchedulerJob, number>
export function nextTick<T = void, R = void>(
this: T,
fn?: (this: T) => R,
): Promise<Awaited<R>> {
const p = currentFlushPromise || resolvedPromise
return fn ? p.then(this ? fn.bind(this) : fn) : p
}
// Use binary-search to find a suitable position in the queue. The queue needs
// to be sorted in increasing order of the job ids. This ensures that:
// 1. Components are updated from parent to child. As the parent is always
// created before the child it will always have a smaller id.
// 2. If a component is unmounted during a parent component's update, its update
// can be skipped.
// A pre watcher will have the same id as its component's update job. The
// watcher should be inserted immediately before the update job. This allows
// watchers to be skipped if the component is unmounted by the parent update.
function findInsertionIndex(id: number) {
let start = isFlushing ? flushIndex + 1 : 0
let end = queue.length
while (start < end) {
const middle = (start + end) >>> 1
const middleJob = queue[middle]
const middleJobId = getId(middleJob)
if (
middleJobId < id ||
(middleJobId === id && middleJob.flags! & SchedulerJobFlags.PRE)
) {
start = middle + 1
} else {
end = middle
}
}
return start
}
export function queueJob(job: SchedulerJob): void {
if (!(job.flags! & SchedulerJobFlags.QUEUED)) {
const jobId = getId(job)
const lastJob = queue[queue.length - 1]
if (
!lastJob ||
// fast path when the job id is larger than the tail
(!(job.flags! & SchedulerJobFlags.PRE) && jobId >= getId(lastJob))
) {
queue.push(job)
} else {
queue.splice(findInsertionIndex(jobId), 0, job)
}
job.flags! |= SchedulerJobFlags.QUEUED
queueFlush()
}
}
function queueFlush() {
if (!isFlushing && !isFlushPending) {
isFlushPending = true
currentFlushPromise = resolvedPromise.then(flushJobs)
}
}
export function queuePostFlushCb(cb: SchedulerJobs): void {
if (!isArray(cb)) {
if (activePostFlushCbs && cb.id === -1) {
activePostFlushCbs.splice(postFlushIndex + 1, 0, cb)
} else if (!(cb.flags! & SchedulerJobFlags.QUEUED)) {
pendingPostFlushCbs.push(cb)
cb.flags! |= SchedulerJobFlags.QUEUED
}
} else {
// if cb is an array, it is a component lifecycle hook which can only be
// triggered by a job, which is already deduped in the main queue, so
// we can skip duplicate check here to improve perf
pendingPostFlushCbs.push(...cb)
}
queueFlush()
}
export function flushPreFlushCbs(
instance?: ComponentInternalInstance,
seen?: CountMap,
// if currently flushing, skip the current job itself
i: number = isFlushing ? flushIndex + 1 : 0,
): void {
if (__DEV__) {
seen = seen || new Map()
}
for (; i < queue.length; i++) {
const cb = queue[i]
if (cb && cb.flags! & SchedulerJobFlags.PRE) {
if (instance && cb.id !== instance.uid) {
continue
}
if (__DEV__ && checkRecursiveUpdates(seen!, cb)) {
continue
}
queue.splice(i, 1)
i--
if (cb.flags! & SchedulerJobFlags.ALLOW_RECURSE) {
cb.flags! &= ~SchedulerJobFlags.QUEUED
}
cb()
if (!(cb.flags! & SchedulerJobFlags.ALLOW_RECURSE)) {
cb.flags! &= ~SchedulerJobFlags.QUEUED
}
}
}
}
export function flushPostFlushCbs(seen?: CountMap): void {
if (pendingPostFlushCbs.length) {
const deduped = [...new Set(pendingPostFlushCbs)].sort(
(a, b) => getId(a) - getId(b),
)
pendingPostFlushCbs.length = 0
// #1947 already has active queue, nested flushPostFlushCbs call
if (activePostFlushCbs) {
activePostFlushCbs.push(...deduped)
return
}
activePostFlushCbs = deduped
if (__DEV__) {
seen = seen || new Map()
}
for (
postFlushIndex = 0;
postFlushIndex < activePostFlushCbs.length;
postFlushIndex++
) {
const cb = activePostFlushCbs[postFlushIndex]
if (__DEV__ && checkRecursiveUpdates(seen!, cb)) {
continue
}
if (cb.flags! & SchedulerJobFlags.ALLOW_RECURSE) {
cb.flags! &= ~SchedulerJobFlags.QUEUED
}
if (!(cb.flags! & SchedulerJobFlags.DISPOSED)) cb()
cb.flags! &= ~SchedulerJobFlags.QUEUED
}
activePostFlushCbs = null
postFlushIndex = 0
}
}
const getId = (job: SchedulerJob): number =>
job.id == null ? (job.flags! & SchedulerJobFlags.PRE ? -1 : Infinity) : job.id
function flushJobs(seen?: CountMap) {
isFlushPending = false
isFlushing = true
if (__DEV__) {
seen = seen || new Map()
}
// conditional usage of checkRecursiveUpdate must be determined out of
// try ... catch block since Rollup by default de-optimizes treeshaking
// inside try-catch. This can leave all warning code unshaked. Although
// they would get eventually shaken by a minifier like terser, some minifiers
// would fail to do that (e.g. https://github.com/evanw/esbuild/issues/1610)
const check = __DEV__
? (job: SchedulerJob) => checkRecursiveUpdates(seen!, job)
: NOOP
try {
for (flushIndex = 0; flushIndex < queue.length; flushIndex++) {
const job = queue[flushIndex]
if (job && !(job.flags! & SchedulerJobFlags.DISPOSED)) {
if (__DEV__ && check(job)) {
continue
}
if (job.flags! & SchedulerJobFlags.ALLOW_RECURSE) {
job.flags! &= ~SchedulerJobFlags.QUEUED
}
callWithErrorHandling(
job,
job.i,
job.i ? ErrorCodes.COMPONENT_UPDATE : ErrorCodes.SCHEDULER,
)
if (!(job.flags! & SchedulerJobFlags.ALLOW_RECURSE)) {
job.flags! &= ~SchedulerJobFlags.QUEUED
}
}
}
} finally {
// If there was an error we still need to clear the QUEUED flags
for (; flushIndex < queue.length; flushIndex++) {
const job = queue[flushIndex]
if (job) {
job.flags! &= ~SchedulerJobFlags.QUEUED
}
}
flushIndex = 0
queue.length = 0
flushPostFlushCbs(seen)
isFlushing = false
currentFlushPromise = null
// some postFlushCb queued jobs!
// keep flushing until it drains.
if (queue.length || pendingPostFlushCbs.length) {
flushJobs(seen)
}
}
}
function checkRecursiveUpdates(seen: CountMap, fn: SchedulerJob) {
const count = seen.get(fn) || 0
if (count > RECURSION_LIMIT) {
const instance = fn.i
const componentName = instance && getComponentName(instance.type)
handleError(
`Maximum recursive updates exceeded${
componentName ? ` in component <${componentName}>` : ``
}. ` +
`This means you have a reactive effect that is mutating its own ` +
`dependencies and thus recursively triggering itself. Possible sources ` +
`include component template, render function, updated hook or ` +
`watcher source function.`,
null,
ErrorCodes.APP_ERROR_HANDLER,
)
return true
}
seen.set(fn, count + 1)
return false
}
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