@angular/core
Version:
Angular - the core framework
244 lines • 35.4 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { setActiveConsumer } from '@angular/core/primitives/signals';
import { assertDefined, assertEqual, assertNotEqual } from '../util/assert';
import { assertFirstCreatePass } from './assert';
import { NgOnChangesFeatureImpl } from './features/ng_onchanges_feature';
import { FLAGS, PREORDER_HOOK_FLAGS } from './interfaces/view';
import { profiler } from './profiler';
import { isInCheckNoChangesMode } from './state';
/**
* Adds all directive lifecycle hooks from the given `DirectiveDef` to the given `TView`.
*
* Must be run *only* on the first template pass.
*
* Sets up the pre-order hooks on the provided `tView`,
* see {@link HookData} for details about the data structure.
*
* @param directiveIndex The index of the directive in LView
* @param directiveDef The definition containing the hooks to setup in tView
* @param tView The current TView
*/
export function registerPreOrderHooks(directiveIndex, directiveDef, tView) {
ngDevMode && assertFirstCreatePass(tView);
const { ngOnChanges, ngOnInit, ngDoCheck } = directiveDef.type.prototype;
if (ngOnChanges) {
const wrappedOnChanges = NgOnChangesFeatureImpl(directiveDef);
(tView.preOrderHooks ??= []).push(directiveIndex, wrappedOnChanges);
(tView.preOrderCheckHooks ??= []).push(directiveIndex, wrappedOnChanges);
}
if (ngOnInit) {
(tView.preOrderHooks ??= []).push(0 - directiveIndex, ngOnInit);
}
if (ngDoCheck) {
(tView.preOrderHooks ??= []).push(directiveIndex, ngDoCheck);
(tView.preOrderCheckHooks ??= []).push(directiveIndex, ngDoCheck);
}
}
/**
*
* Loops through the directives on the provided `tNode` and queues hooks to be
* run that are not initialization hooks.
*
* Should be executed during `elementEnd()` and similar to
* preserve hook execution order. Content, view, and destroy hooks for projected
* components and directives must be called *before* their hosts.
*
* Sets up the content, view, and destroy hooks on the provided `tView`,
* see {@link HookData} for details about the data structure.
*
* NOTE: This does not set up `onChanges`, `onInit` or `doCheck`, those are set up
* separately at `elementStart`.
*
* @param tView The current TView
* @param tNode The TNode whose directives are to be searched for hooks to queue
*/
export function registerPostOrderHooks(tView, tNode) {
ngDevMode && assertFirstCreatePass(tView);
// It's necessary to loop through the directives at elementEnd() (rather than processing in
// directiveCreate) so we can preserve the current hook order. Content, view, and destroy
// hooks for projected components and directives must be called *before* their hosts.
for (let i = tNode.directiveStart, end = tNode.directiveEnd; i < end; i++) {
const directiveDef = tView.data[i];
ngDevMode && assertDefined(directiveDef, 'Expecting DirectiveDef');
const lifecycleHooks = directiveDef.type.prototype;
const { ngAfterContentInit, ngAfterContentChecked, ngAfterViewInit, ngAfterViewChecked, ngOnDestroy } = lifecycleHooks;
if (ngAfterContentInit) {
(tView.contentHooks ??= []).push(-i, ngAfterContentInit);
}
if (ngAfterContentChecked) {
(tView.contentHooks ??= []).push(i, ngAfterContentChecked);
(tView.contentCheckHooks ??= []).push(i, ngAfterContentChecked);
}
if (ngAfterViewInit) {
(tView.viewHooks ??= []).push(-i, ngAfterViewInit);
}
if (ngAfterViewChecked) {
(tView.viewHooks ??= []).push(i, ngAfterViewChecked);
(tView.viewCheckHooks ??= []).push(i, ngAfterViewChecked);
}
if (ngOnDestroy != null) {
(tView.destroyHooks ??= []).push(i, ngOnDestroy);
}
}
}
/**
* Executing hooks requires complex logic as we need to deal with 2 constraints.
*
* 1. Init hooks (ngOnInit, ngAfterContentInit, ngAfterViewInit) must all be executed once and only
* once, across many change detection cycles. This must be true even if some hooks throw, or if
* some recursively trigger a change detection cycle.
* To solve that, it is required to track the state of the execution of these init hooks.
* This is done by storing and maintaining flags in the view: the {@link InitPhaseState},
* and the index within that phase. They can be seen as a cursor in the following structure:
* [[onInit1, onInit2], [afterContentInit1], [afterViewInit1, afterViewInit2, afterViewInit3]]
* They are stored as flags in LView[FLAGS].
*
* 2. Pre-order hooks can be executed in batches, because of the select instruction.
* To be able to pause and resume their execution, we also need some state about the hook's array
* that is being processed:
* - the index of the next hook to be executed
* - the number of init hooks already found in the processed part of the array
* They are stored as flags in LView[PREORDER_HOOK_FLAGS].
*/
/**
* Executes pre-order check hooks ( OnChanges, DoChanges) given a view where all the init hooks were
* executed once. This is a light version of executeInitAndCheckPreOrderHooks where we can skip read
* / write of the init-hooks related flags.
* @param lView The LView where hooks are defined
* @param hooks Hooks to be run
* @param nodeIndex 3 cases depending on the value:
* - undefined: all hooks from the array should be executed (post-order case)
* - null: execute hooks only from the saved index until the end of the array (pre-order case, when
* flushing the remaining hooks)
* - number: execute hooks only from the saved index until that node index exclusive (pre-order
* case, when executing select(number))
*/
export function executeCheckHooks(lView, hooks, nodeIndex) {
callHooks(lView, hooks, 3 /* InitPhaseState.InitPhaseCompleted */, nodeIndex);
}
/**
* Executes post-order init and check hooks (one of AfterContentInit, AfterContentChecked,
* AfterViewInit, AfterViewChecked) given a view where there are pending init hooks to be executed.
* @param lView The LView where hooks are defined
* @param hooks Hooks to be run
* @param initPhase A phase for which hooks should be run
* @param nodeIndex 3 cases depending on the value:
* - undefined: all hooks from the array should be executed (post-order case)
* - null: execute hooks only from the saved index until the end of the array (pre-order case, when
* flushing the remaining hooks)
* - number: execute hooks only from the saved index until that node index exclusive (pre-order
* case, when executing select(number))
*/
export function executeInitAndCheckHooks(lView, hooks, initPhase, nodeIndex) {
ngDevMode &&
assertNotEqual(initPhase, 3 /* InitPhaseState.InitPhaseCompleted */, 'Init pre-order hooks should not be called more than once');
if ((lView[FLAGS] & 3 /* LViewFlags.InitPhaseStateMask */) === initPhase) {
callHooks(lView, hooks, initPhase, nodeIndex);
}
}
export function incrementInitPhaseFlags(lView, initPhase) {
ngDevMode &&
assertNotEqual(initPhase, 3 /* InitPhaseState.InitPhaseCompleted */, 'Init hooks phase should not be incremented after all init hooks have been run.');
let flags = lView[FLAGS];
if ((flags & 3 /* LViewFlags.InitPhaseStateMask */) === initPhase) {
flags &= 16383 /* LViewFlags.IndexWithinInitPhaseReset */;
flags += 1 /* LViewFlags.InitPhaseStateIncrementer */;
lView[FLAGS] = flags;
}
}
/**
* Calls lifecycle hooks with their contexts, skipping init hooks if it's not
* the first LView pass
*
* @param currentView The current view
* @param arr The array in which the hooks are found
* @param initPhaseState the current state of the init phase
* @param currentNodeIndex 3 cases depending on the value:
* - undefined: all hooks from the array should be executed (post-order case)
* - null: execute hooks only from the saved index until the end of the array (pre-order case, when
* flushing the remaining hooks)
* - number: execute hooks only from the saved index until that node index exclusive (pre-order
* case, when executing select(number))
*/
function callHooks(currentView, arr, initPhase, currentNodeIndex) {
ngDevMode &&
assertEqual(isInCheckNoChangesMode(), false, 'Hooks should never be run when in check no changes mode.');
const startIndex = currentNodeIndex !== undefined ?
(currentView[PREORDER_HOOK_FLAGS] & 65535 /* PreOrderHookFlags.IndexOfTheNextPreOrderHookMaskMask */) :
0;
const nodeIndexLimit = currentNodeIndex != null ? currentNodeIndex : -1;
const max = arr.length - 1; // Stop the loop at length - 1, because we look for the hook at i + 1
let lastNodeIndexFound = 0;
for (let i = startIndex; i < max; i++) {
const hook = arr[i + 1];
if (typeof hook === 'number') {
lastNodeIndexFound = arr[i];
if (currentNodeIndex != null && lastNodeIndexFound >= currentNodeIndex) {
break;
}
}
else {
const isInitHook = arr[i] < 0;
if (isInitHook) {
currentView[PREORDER_HOOK_FLAGS] += 65536 /* PreOrderHookFlags.NumberOfInitHooksCalledIncrementer */;
}
if (lastNodeIndexFound < nodeIndexLimit || nodeIndexLimit == -1) {
callHook(currentView, initPhase, arr, i);
currentView[PREORDER_HOOK_FLAGS] =
(currentView[PREORDER_HOOK_FLAGS] & 4294901760 /* PreOrderHookFlags.NumberOfInitHooksCalledMask */) + i +
2;
}
i++;
}
}
}
/**
* Executes a single lifecycle hook, making sure that:
* - it is called in the non-reactive context;
* - profiling data are registered.
*/
function callHookInternal(directive, hook) {
profiler(4 /* ProfilerEvent.LifecycleHookStart */, directive, hook);
const prevConsumer = setActiveConsumer(null);
try {
hook.call(directive);
}
finally {
setActiveConsumer(prevConsumer);
profiler(5 /* ProfilerEvent.LifecycleHookEnd */, directive, hook);
}
}
/**
* Execute one hook against the current `LView`.
*
* @param currentView The current view
* @param initPhaseState the current state of the init phase
* @param arr The array in which the hooks are found
* @param i The current index within the hook data array
*/
function callHook(currentView, initPhase, arr, i) {
const isInitHook = arr[i] < 0;
const hook = arr[i + 1];
const directiveIndex = isInitHook ? -arr[i] : arr[i];
const directive = currentView[directiveIndex];
if (isInitHook) {
const indexWithintInitPhase = currentView[FLAGS] >> 14 /* LViewFlags.IndexWithinInitPhaseShift */;
// The init phase state must be always checked here as it may have been recursively updated.
if (indexWithintInitPhase <
(currentView[PREORDER_HOOK_FLAGS] >> 16 /* PreOrderHookFlags.NumberOfInitHooksCalledShift */) &&
(currentView[FLAGS] & 3 /* LViewFlags.InitPhaseStateMask */) === initPhase) {
currentView[FLAGS] += 16384 /* LViewFlags.IndexWithinInitPhaseIncrementer */;
callHookInternal(directive, hook);
}
}
else {
callHookInternal(directive, hook);
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {setActiveConsumer} from '@angular/core/primitives/signals';\n\nimport {AfterContentChecked, AfterContentInit, AfterViewChecked, AfterViewInit, DoCheck, OnChanges, OnDestroy, OnInit} from '../interface/lifecycle_hooks';\nimport {assertDefined, assertEqual, assertNotEqual} from '../util/assert';\n\nimport {assertFirstCreatePass} from './assert';\nimport {NgOnChangesFeatureImpl} from './features/ng_onchanges_feature';\nimport {DirectiveDef} from './interfaces/definition';\nimport {TNode} from './interfaces/node';\nimport {FLAGS, HookData, InitPhaseState, LView, LViewFlags, PREORDER_HOOK_FLAGS, PreOrderHookFlags, TView} from './interfaces/view';\nimport {profiler, ProfilerEvent} from './profiler';\nimport {isInCheckNoChangesMode} from './state';\n\n\n\n/**\n * Adds all directive lifecycle hooks from the given `DirectiveDef` to the given `TView`.\n *\n * Must be run *only* on the first template pass.\n *\n * Sets up the pre-order hooks on the provided `tView`,\n * see {@link HookData} for details about the data structure.\n *\n * @param directiveIndex The index of the directive in LView\n * @param directiveDef The definition containing the hooks to setup in tView\n * @param tView The current TView\n */\nexport function registerPreOrderHooks(\n    directiveIndex: number, directiveDef: DirectiveDef<any>, tView: TView): void {\n  ngDevMode && assertFirstCreatePass(tView);\n  const {ngOnChanges, ngOnInit, ngDoCheck} =\n      directiveDef.type.prototype as OnChanges & OnInit & DoCheck;\n\n  if (ngOnChanges as Function | undefined) {\n    const wrappedOnChanges = NgOnChangesFeatureImpl(directiveDef);\n    (tView.preOrderHooks ??= []).push(directiveIndex, wrappedOnChanges);\n    (tView.preOrderCheckHooks ??= []).push(directiveIndex, wrappedOnChanges);\n  }\n\n  if (ngOnInit) {\n    (tView.preOrderHooks ??= []).push(0 - directiveIndex, ngOnInit);\n  }\n\n  if (ngDoCheck) {\n    (tView.preOrderHooks ??= []).push(directiveIndex, ngDoCheck);\n    (tView.preOrderCheckHooks ??= []).push(directiveIndex, ngDoCheck);\n  }\n}\n\n/**\n *\n * Loops through the directives on the provided `tNode` and queues hooks to be\n * run that are not initialization hooks.\n *\n * Should be executed during `elementEnd()` and similar to\n * preserve hook execution order. Content, view, and destroy hooks for projected\n * components and directives must be called *before* their hosts.\n *\n * Sets up the content, view, and destroy hooks on the provided `tView`,\n * see {@link HookData} for details about the data structure.\n *\n * NOTE: This does not set up `onChanges`, `onInit` or `doCheck`, those are set up\n * separately at `elementStart`.\n *\n * @param tView The current TView\n * @param tNode The TNode whose directives are to be searched for hooks to queue\n */\nexport function registerPostOrderHooks(tView: TView, tNode: TNode): void {\n  ngDevMode && assertFirstCreatePass(tView);\n  // It's necessary to loop through the directives at elementEnd() (rather than processing in\n  // directiveCreate) so we can preserve the current hook order. Content, view, and destroy\n  // hooks for projected components and directives must be called *before* their hosts.\n  for (let i = tNode.directiveStart, end = tNode.directiveEnd; i < end; i++) {\n    const directiveDef = tView.data[i] as DirectiveDef<any>;\n    ngDevMode && assertDefined(directiveDef, 'Expecting DirectiveDef');\n    const lifecycleHooks: AfterContentInit&AfterContentChecked&AfterViewInit&AfterViewChecked&\n        OnDestroy = directiveDef.type.prototype;\n    const {\n      ngAfterContentInit,\n      ngAfterContentChecked,\n      ngAfterViewInit,\n      ngAfterViewChecked,\n      ngOnDestroy\n    } = lifecycleHooks;\n\n    if (ngAfterContentInit) {\n      (tView.contentHooks ??= []).push(-i, ngAfterContentInit);\n    }\n\n    if (ngAfterContentChecked) {\n      (tView.contentHooks ??= []).push(i, ngAfterContentChecked);\n      (tView.contentCheckHooks ??= []).push(i, ngAfterContentChecked);\n    }\n\n    if (ngAfterViewInit) {\n      (tView.viewHooks ??= []).push(-i, ngAfterViewInit);\n    }\n\n    if (ngAfterViewChecked) {\n      (tView.viewHooks ??= []).push(i, ngAfterViewChecked);\n      (tView.viewCheckHooks ??= []).push(i, ngAfterViewChecked);\n    }\n\n    if (ngOnDestroy != null) {\n      (tView.destroyHooks ??= []).push(i, ngOnDestroy);\n    }\n  }\n}\n\n/**\n * Executing hooks requires complex logic as we need to deal with 2 constraints.\n *\n * 1. Init hooks (ngOnInit, ngAfterContentInit, ngAfterViewInit) must all be executed once and only\n * once, across many change detection cycles. This must be true even if some hooks throw, or if\n * some recursively trigger a change detection cycle.\n * To solve that, it is required to track the state of the execution of these init hooks.\n * This is done by storing and maintaining flags in the view: the {@link InitPhaseState},\n * and the index within that phase. They can be seen as a cursor in the following structure:\n * [[onInit1, onInit2], [afterContentInit1], [afterViewInit1, afterViewInit2, afterViewInit3]]\n * They are stored as flags in LView[FLAGS].\n *\n * 2. Pre-order hooks can be executed in batches, because of the select instruction.\n * To be able to pause and resume their execution, we also need some state about the hook's array\n * that is being processed:\n * - the index of the next hook to be executed\n * - the number of init hooks already found in the processed part of the  array\n * They are stored as flags in LView[PREORDER_HOOK_FLAGS].\n */\n\n\n/**\n * Executes pre-order check hooks ( OnChanges, DoChanges) given a view where all the init hooks were\n * executed once. This is a light version of executeInitAndCheckPreOrderHooks where we can skip read\n * / write of the init-hooks related flags.\n * @param lView The LView where hooks are defined\n * @param hooks Hooks to be run\n * @param nodeIndex 3 cases depending on the value:\n * - undefined: all hooks from the array should be executed (post-order case)\n * - null: execute hooks only from the saved index until the end of the array (pre-order case, when\n * flushing the remaining hooks)\n * - number: execute hooks only from the saved index until that node index exclusive (pre-order\n * case, when executing select(number))\n */\nexport function executeCheckHooks(lView: LView, hooks: HookData, nodeIndex?: number|null) {\n  callHooks(lView, hooks, InitPhaseState.InitPhaseCompleted, nodeIndex);\n}\n\n/**\n * Executes post-order init and check hooks (one of AfterContentInit, AfterContentChecked,\n * AfterViewInit, AfterViewChecked) given a view where there are pending init hooks to be executed.\n * @param lView The LView where hooks are defined\n * @param hooks Hooks to be run\n * @param initPhase A phase for which hooks should be run\n * @param nodeIndex 3 cases depending on the value:\n * - undefined: all hooks from the array should be executed (post-order case)\n * - null: execute hooks only from the saved index until the end of the array (pre-order case, when\n * flushing the remaining hooks)\n * - number: execute hooks only from the saved index until that node index exclusive (pre-order\n * case, when executing select(number))\n */\nexport function executeInitAndCheckHooks(\n    lView: LView, hooks: HookData, initPhase: InitPhaseState, nodeIndex?: number|null) {\n  ngDevMode &&\n      assertNotEqual(\n          initPhase, InitPhaseState.InitPhaseCompleted,\n          'Init pre-order hooks should not be called more than once');\n  if ((lView[FLAGS] & LViewFlags.InitPhaseStateMask) === initPhase) {\n    callHooks(lView, hooks, initPhase, nodeIndex);\n  }\n}\n\nexport function incrementInitPhaseFlags(lView: LView, initPhase: InitPhaseState): void {\n  ngDevMode &&\n      assertNotEqual(\n          initPhase, InitPhaseState.InitPhaseCompleted,\n          'Init hooks phase should not be incremented after all init hooks have been run.');\n  let flags = lView[FLAGS];\n  if ((flags & LViewFlags.InitPhaseStateMask) === initPhase) {\n    flags &= LViewFlags.IndexWithinInitPhaseReset;\n    flags += LViewFlags.InitPhaseStateIncrementer;\n    lView[FLAGS] = flags;\n  }\n}\n\n/**\n * Calls lifecycle hooks with their contexts, skipping init hooks if it's not\n * the first LView pass\n *\n * @param currentView The current view\n * @param arr The array in which the hooks are found\n * @param initPhaseState the current state of the init phase\n * @param currentNodeIndex 3 cases depending on the value:\n * - undefined: all hooks from the array should be executed (post-order case)\n * - null: execute hooks only from the saved index until the end of the array (pre-order case, when\n * flushing the remaining hooks)\n * - number: execute hooks only from the saved index until that node index exclusive (pre-order\n * case, when executing select(number))\n */\nfunction callHooks(\n    currentView: LView, arr: HookData, initPhase: InitPhaseState,\n    currentNodeIndex: number|null|undefined): void {\n  ngDevMode &&\n      assertEqual(\n          isInCheckNoChangesMode(), false,\n          'Hooks should never be run when in check no changes mode.');\n  const startIndex = currentNodeIndex !== undefined ?\n      (currentView[PREORDER_HOOK_FLAGS] & PreOrderHookFlags.IndexOfTheNextPreOrderHookMaskMask) :\n      0;\n  const nodeIndexLimit = currentNodeIndex != null ? currentNodeIndex : -1;\n  const max = arr.length - 1;  // Stop the loop at length - 1, because we look for the hook at i + 1\n  let lastNodeIndexFound = 0;\n  for (let i = startIndex; i < max; i++) {\n    const hook = arr[i + 1] as number | (() => void);\n    if (typeof hook === 'number') {\n      lastNodeIndexFound = arr[i] as number;\n      if (currentNodeIndex != null && lastNodeIndexFound >= currentNodeIndex) {\n        break;\n      }\n    } else {\n      const isInitHook = (arr[i] as number) < 0;\n      if (isInitHook) {\n        currentView[PREORDER_HOOK_FLAGS] += PreOrderHookFlags.NumberOfInitHooksCalledIncrementer;\n      }\n      if (lastNodeIndexFound < nodeIndexLimit || nodeIndexLimit == -1) {\n        callHook(currentView, initPhase, arr, i);\n        currentView[PREORDER_HOOK_FLAGS] =\n            (currentView[PREORDER_HOOK_FLAGS] & PreOrderHookFlags.NumberOfInitHooksCalledMask) + i +\n            2;\n      }\n      i++;\n    }\n  }\n}\n\n/**\n * Executes a single lifecycle hook, making sure that:\n * - it is called in the non-reactive context;\n * - profiling data are registered.\n */\nfunction callHookInternal(directive: any, hook: () => void) {\n  profiler(ProfilerEvent.LifecycleHookStart, directive, hook);\n  const prevConsumer = setActiveConsumer(null);\n  try {\n    hook.call(directive);\n  } finally {\n    setActiveConsumer(prevConsumer);\n    profiler(ProfilerEvent.LifecycleHookEnd, directive, hook);\n  }\n}\n\n/**\n * Execute one hook against the current `LView`.\n *\n * @param currentView The current view\n * @param initPhaseState the current state of the init phase\n * @param arr The array in which the hooks are found\n * @param i The current index within the hook data array\n */\nfunction callHook(currentView: LView, initPhase: InitPhaseState, arr: HookData, i: number) {\n  const isInitHook = (arr[i] as number) < 0;\n  const hook = arr[i + 1] as () => void;\n  const directiveIndex = isInitHook ? -arr[i] : arr[i] as number;\n  const directive = currentView[directiveIndex];\n  if (isInitHook) {\n    const indexWithintInitPhase = currentView[FLAGS] >> LViewFlags.IndexWithinInitPhaseShift;\n    // The init phase state must be always checked here as it may have been recursively updated.\n    if (indexWithintInitPhase <\n            (currentView[PREORDER_HOOK_FLAGS] >> PreOrderHookFlags.NumberOfInitHooksCalledShift) &&\n        (currentView[FLAGS] & LViewFlags.InitPhaseStateMask) === initPhase) {\n      currentView[FLAGS] += LViewFlags.IndexWithinInitPhaseIncrementer;\n      callHookInternal(directive, hook);\n    }\n  } else {\n    callHookInternal(directive, hook);\n  }\n}\n"]}