/** * @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 '../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 &= 8191 /* 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] >> 13 /* 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] += 8192 /* 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 {AfterContentChecked, AfterContentInit, AfterViewChecked, AfterViewInit, DoCheck, OnChanges, OnDestroy, OnInit} from '../interface/lifecycle_hooks';\nimport {setActiveConsumer} from '../signals';\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"]}