@angular/core
Version:
Angular - the core framework
221 lines • 32.2 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 { assertEqual, assertNotEqual } from '../util/assert';
import { assertFirstCreatePass } from './assert';
import { FLAGS, PREORDER_HOOK_FLAGS } from './interfaces/view';
import { getCheckNoChangesMode } 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 { onChanges, onInit, doCheck } = directiveDef;
if (onChanges) {
(tView.preOrderHooks || (tView.preOrderHooks = [])).push(directiveIndex, onChanges);
(tView.preOrderCheckHooks || (tView.preOrderCheckHooks = [])).push(directiveIndex, onChanges);
}
if (onInit) {
(tView.preOrderHooks || (tView.preOrderHooks = [])).push(-directiveIndex, onInit);
}
if (doCheck) {
(tView.preOrderHooks || (tView.preOrderHooks = [])).push(directiveIndex, doCheck);
(tView.preOrderCheckHooks || (tView.preOrderCheckHooks = [])).push(directiveIndex, doCheck);
}
}
/**
*
* 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];
if (directiveDef.afterContentInit) {
(tView.contentHooks || (tView.contentHooks = [])).push(-i, directiveDef.afterContentInit);
}
if (directiveDef.afterContentChecked) {
(tView.contentHooks || (tView.contentHooks = [])).push(i, directiveDef.afterContentChecked);
(tView.contentCheckHooks || (tView.contentCheckHooks = []))
.push(i, directiveDef.afterContentChecked);
}
if (directiveDef.afterViewInit) {
(tView.viewHooks || (tView.viewHooks = [])).push(-i, directiveDef.afterViewInit);
}
if (directiveDef.afterViewChecked) {
(tView.viewHooks || (tView.viewHooks = [])).push(i, directiveDef.afterViewChecked);
(tView.viewCheckHooks || (tView.viewCheckHooks = [])).push(i, directiveDef.afterViewChecked);
}
if (directiveDef.onDestroy != null) {
(tView.destroyHooks || (tView.destroyHooks = [])).push(i, directiveDef.onDestroy);
}
}
}
/**
* 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 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 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 /* 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 /* InitPhaseCompleted */, 'Init pre-order hooks should not be called more than once');
if ((lView[FLAGS] & 3 /* InitPhaseStateMask */) === initPhase) {
callHooks(lView, hooks, initPhase, nodeIndex);
}
}
export function incrementInitPhaseFlags(lView, initPhase) {
ngDevMode &&
assertNotEqual(initPhase, 3 /* InitPhaseCompleted */, 'Init hooks phase should not be incremented after all init hooks have been run.');
let flags = lView[FLAGS];
if ((flags & 3 /* InitPhaseStateMask */) === initPhase) {
flags &= 2047 /* IndexWithinInitPhaseReset */;
flags += 1 /* 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(getCheckNoChangesMode(), false, 'Hooks should never be run in the check no changes mode.');
const startIndex = currentNodeIndex !== undefined ?
(currentView[PREORDER_HOOK_FLAGS] & 65535 /* IndexOfTheNextPreOrderHookMaskMask */) :
0;
const nodeIndexLimit = currentNodeIndex != null ? currentNodeIndex : -1;
let lastNodeIndexFound = 0;
for (let i = startIndex; i < arr.length; 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 /* NumberOfInitHooksCalledIncrementer */;
if (lastNodeIndexFound < nodeIndexLimit || nodeIndexLimit == -1) {
callHook(currentView, initPhase, arr, i);
currentView[PREORDER_HOOK_FLAGS] =
(currentView[PREORDER_HOOK_FLAGS] & 4294901760 /* NumberOfInitHooksCalledMask */) + i +
2;
}
i++;
}
}
}
/**
* 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] >> 11 /* IndexWithinInitPhaseShift */;
// The init phase state must be always checked here as it may have been recursively
// updated
if (indexWithintInitPhase <
(currentView[PREORDER_HOOK_FLAGS] >> 16 /* NumberOfInitHooksCalledShift */) &&
(currentView[FLAGS] & 3 /* InitPhaseStateMask */) === initPhase) {
currentView[FLAGS] += 2048 /* IndexWithinInitPhaseIncrementer */;
hook.call(directive);
}
}
else {
hook.call(directive);
}
}
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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 {assertEqual, assertNotEqual} from '../util/assert';\n\nimport {assertFirstCreatePass} from './assert';\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 {getCheckNoChangesMode} 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 {onChanges, onInit, doCheck} = directiveDef;\n\n  if (onChanges) {\n    (tView.preOrderHooks || (tView.preOrderHooks = [])).push(directiveIndex, onChanges);\n    (tView.preOrderCheckHooks || (tView.preOrderCheckHooks = [])).push(directiveIndex, onChanges);\n  }\n\n  if (onInit) {\n    (tView.preOrderHooks || (tView.preOrderHooks = [])).push(-directiveIndex, onInit);\n  }\n\n  if (doCheck) {\n    (tView.preOrderHooks || (tView.preOrderHooks = [])).push(directiveIndex, doCheck);\n    (tView.preOrderCheckHooks || (tView.preOrderCheckHooks = [])).push(directiveIndex, doCheck);\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    if (directiveDef.afterContentInit) {\n      (tView.contentHooks || (tView.contentHooks = [])).push(-i, directiveDef.afterContentInit);\n    }\n\n    if (directiveDef.afterContentChecked) {\n      (tView.contentHooks || (tView.contentHooks = [])).push(i, directiveDef.afterContentChecked);\n      (tView.contentCheckHooks || (tView.contentCheckHooks = []))\n          .push(i, directiveDef.afterContentChecked);\n    }\n\n    if (directiveDef.afterViewInit) {\n      (tView.viewHooks || (tView.viewHooks = [])).push(-i, directiveDef.afterViewInit);\n    }\n\n    if (directiveDef.afterViewChecked) {\n      (tView.viewHooks || (tView.viewHooks = [])).push(i, directiveDef.afterViewChecked);\n      (tView.viewCheckHooks || (tView.viewCheckHooks = [])).push(i, directiveDef.afterViewChecked);\n    }\n\n    if (directiveDef.onDestroy != null) {\n      (tView.destroyHooks || (tView.destroyHooks = [])).push(i, directiveDef.onDestroy);\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 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 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          getCheckNoChangesMode(), false,\n          'Hooks should never be run in the 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  let lastNodeIndexFound = 0;\n  for (let i = startIndex; i < arr.length; i++) {\n    const hook = arr[i + 1] as () => 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] < 0;\n      if (isInitHook)\n        currentView[PREORDER_HOOK_FLAGS] += PreOrderHookFlags.NumberOfInitHooksCalledIncrementer;\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 * 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] < 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\n    // updated\n    if (indexWithintInitPhase <\n            (currentView[PREORDER_HOOK_FLAGS] >> PreOrderHookFlags.NumberOfInitHooksCalledShift) &&\n        (currentView[FLAGS] & LViewFlags.InitPhaseStateMask) === initPhase) {\n      currentView[FLAGS] += LViewFlags.IndexWithinInitPhaseIncrementer;\n      hook.call(directive);\n    }\n  } else {\n    hook.call(directive);\n  }\n}\n"]}