/** * @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 { InjectFlags } from '../di/interface/injector'; import { assertDefined, assertEqual, assertGreaterThanOrEqual, assertLessThan, assertNotEqual, throwError } from '../util/assert'; import { assertLViewOrUndefined, assertTNodeForLView, assertTNodeForTView } from './assert'; import { CONTEXT, DECLARATION_VIEW, HEADER_OFFSET, T_HOST, TVIEW } from './interfaces/view'; import { MATH_ML_NAMESPACE, SVG_NAMESPACE } from './namespaces'; import { getTNode } from './util/view_utils'; const instructionState = { lFrame: createLFrame(null), bindingsEnabled: true, skipHydrationRootTNode: null, }; /** * In this mode, any changes in bindings will throw an ExpressionChangedAfterChecked error. * * Necessary to support ChangeDetectorRef.checkNoChanges(). * * The `checkNoChanges` function is invoked only in ngDevMode=true and verifies that no unintended * changes exist in the change detector or its children. */ let _isInCheckNoChangesMode = false; /** * Returns true if the instruction state stack is empty. * * Intended to be called from tests only (tree shaken otherwise). */ export function specOnlyIsInstructionStateEmpty() { return instructionState.lFrame.parent === null; } export function getElementDepthCount() { return instructionState.lFrame.elementDepthCount; } export function increaseElementDepthCount() { instructionState.lFrame.elementDepthCount++; } export function decreaseElementDepthCount() { instructionState.lFrame.elementDepthCount--; } export function getBindingsEnabled() { return instructionState.bindingsEnabled; } /** * Returns true if currently inside a skip hydration block. * @returns boolean */ export function isInSkipHydrationBlock() { return instructionState.skipHydrationRootTNode !== null; } /** * Returns true if this is the root TNode of the skip hydration block. * @param tNode the current TNode * @returns boolean */ export function isSkipHydrationRootTNode(tNode) { return instructionState.skipHydrationRootTNode === tNode; } /** * Enables directive matching on elements. * * * Example: * ``` * * Should match component / directive. * *
* * * Should not match component / directive because we are in ngNonBindable. * * *
* ``` * * @codeGenApi */ export function ɵɵenableBindings() { instructionState.bindingsEnabled = true; } /** * Sets a flag to specify that the TNode is in a skip hydration block. * @param tNode the current TNode */ export function enterSkipHydrationBlock(tNode) { instructionState.skipHydrationRootTNode = tNode; } /** * Disables directive matching on element. * * * Example: * ``` * * Should match component / directive. * *
* * * Should not match component / directive because we are in ngNonBindable. * * *
* ``` * * @codeGenApi */ export function ɵɵdisableBindings() { instructionState.bindingsEnabled = false; } /** * Clears the root skip hydration node when leaving a skip hydration block. */ export function leaveSkipHydrationBlock() { instructionState.skipHydrationRootTNode = null; } /** * Return the current `LView`. */ export function getLView() { return instructionState.lFrame.lView; } /** * Return the current `TView`. */ export function getTView() { return instructionState.lFrame.tView; } /** * Restores `contextViewData` to the given OpaqueViewState instance. * * Used in conjunction with the getCurrentView() instruction to save a snapshot * of the current view and restore it when listeners are invoked. This allows * walking the declaration view tree in listeners to get vars from parent views. * * @param viewToRestore The OpaqueViewState instance to restore. * @returns Context of the restored OpaqueViewState instance. * * @codeGenApi */ export function ɵɵrestoreView(viewToRestore) { instructionState.lFrame.contextLView = viewToRestore; return viewToRestore[CONTEXT]; } /** * Clears the view set in `ɵɵrestoreView` from memory. Returns the passed in * value so that it can be used as a return value of an instruction. * * @codeGenApi */ export function ɵɵresetView(value) { instructionState.lFrame.contextLView = null; return value; } export function getCurrentTNode() { let currentTNode = getCurrentTNodePlaceholderOk(); while (currentTNode !== null && currentTNode.type === 64 /* TNodeType.Placeholder */) { currentTNode = currentTNode.parent; } return currentTNode; } export function getCurrentTNodePlaceholderOk() { return instructionState.lFrame.currentTNode; } export function getCurrentParentTNode() { const lFrame = instructionState.lFrame; const currentTNode = lFrame.currentTNode; return lFrame.isParent ? currentTNode : currentTNode.parent; } export function setCurrentTNode(tNode, isParent) { ngDevMode && tNode && assertTNodeForTView(tNode, instructionState.lFrame.tView); const lFrame = instructionState.lFrame; lFrame.currentTNode = tNode; lFrame.isParent = isParent; } export function isCurrentTNodeParent() { return instructionState.lFrame.isParent; } export function setCurrentTNodeAsNotParent() { instructionState.lFrame.isParent = false; } export function getContextLView() { const contextLView = instructionState.lFrame.contextLView; ngDevMode && assertDefined(contextLView, 'contextLView must be defined.'); return contextLView; } export function isInCheckNoChangesMode() { !ngDevMode && throwError('Must never be called in production mode'); return _isInCheckNoChangesMode; } export function setIsInCheckNoChangesMode(mode) { !ngDevMode && throwError('Must never be called in production mode'); _isInCheckNoChangesMode = mode; } // top level variables should not be exported for performance reasons (PERF_NOTES.md) export function getBindingRoot() { const lFrame = instructionState.lFrame; let index = lFrame.bindingRootIndex; if (index === -1) { index = lFrame.bindingRootIndex = lFrame.tView.bindingStartIndex; } return index; } export function getBindingIndex() { return instructionState.lFrame.bindingIndex; } export function setBindingIndex(value) { return instructionState.lFrame.bindingIndex = value; } export function nextBindingIndex() { return instructionState.lFrame.bindingIndex++; } export function incrementBindingIndex(count) { const lFrame = instructionState.lFrame; const index = lFrame.bindingIndex; lFrame.bindingIndex = lFrame.bindingIndex + count; return index; } export function isInI18nBlock() { return instructionState.lFrame.inI18n; } export function setInI18nBlock(isInI18nBlock) { instructionState.lFrame.inI18n = isInI18nBlock; } /** * Set a new binding root index so that host template functions can execute. * * Bindings inside the host template are 0 index. But because we don't know ahead of time * how many host bindings we have we can't pre-compute them. For this reason they are all * 0 index and we just shift the root so that they match next available location in the LView. * * @param bindingRootIndex Root index for `hostBindings` * @param currentDirectiveIndex `TData[currentDirectiveIndex]` will point to the current directive * whose `hostBindings` are being processed. */ export function setBindingRootForHostBindings(bindingRootIndex, currentDirectiveIndex) { const lFrame = instructionState.lFrame; lFrame.bindingIndex = lFrame.bindingRootIndex = bindingRootIndex; setCurrentDirectiveIndex(currentDirectiveIndex); } /** * When host binding is executing this points to the directive index. * `TView.data[getCurrentDirectiveIndex()]` is `DirectiveDef` * `LView[getCurrentDirectiveIndex()]` is directive instance. */ export function getCurrentDirectiveIndex() { return instructionState.lFrame.currentDirectiveIndex; } /** * Sets an index of a directive whose `hostBindings` are being processed. * * @param currentDirectiveIndex `TData` index where current directive instance can be found. */ export function setCurrentDirectiveIndex(currentDirectiveIndex) { instructionState.lFrame.currentDirectiveIndex = currentDirectiveIndex; } /** * Retrieve the current `DirectiveDef` which is active when `hostBindings` instruction is being * executed. * * @param tData Current `TData` where the `DirectiveDef` will be looked up at. */ export function getCurrentDirectiveDef(tData) { const currentDirectiveIndex = instructionState.lFrame.currentDirectiveIndex; return currentDirectiveIndex === -1 ? null : tData[currentDirectiveIndex]; } export function getCurrentQueryIndex() { return instructionState.lFrame.currentQueryIndex; } export function setCurrentQueryIndex(value) { instructionState.lFrame.currentQueryIndex = value; } /** * Returns a `TNode` of the location where the current `LView` is declared at. * * @param lView an `LView` that we want to find parent `TNode` for. */ function getDeclarationTNode(lView) { const tView = lView[TVIEW]; // Return the declaration parent for embedded views if (tView.type === 2 /* TViewType.Embedded */) { ngDevMode && assertDefined(tView.declTNode, 'Embedded TNodes should have declaration parents.'); return tView.declTNode; } // Components don't have `TView.declTNode` because each instance of component could be // inserted in different location, hence `TView.declTNode` is meaningless. // Falling back to `T_HOST` in case we cross component boundary. if (tView.type === 1 /* TViewType.Component */) { return lView[T_HOST]; } // Remaining TNode type is `TViewType.Root` which doesn't have a parent TNode. return null; } /** * This is a light weight version of the `enterView` which is needed by the DI system. * * @param lView `LView` location of the DI context. * @param tNode `TNode` for DI context * @param flags DI context flags. if `SkipSelf` flag is set than we walk up the declaration * tree from `tNode` until we find parent declared `TElementNode`. * @returns `true` if we have successfully entered DI associated with `tNode` (or with declared * `TNode` if `flags` has `SkipSelf`). Failing to enter DI implies that no associated * `NodeInjector` can be found and we should instead use `ModuleInjector`. * - If `true` than this call must be fallowed by `leaveDI` * - If `false` than this call failed and we should NOT call `leaveDI` */ export function enterDI(lView, tNode, flags) { ngDevMode && assertLViewOrUndefined(lView); if (flags & InjectFlags.SkipSelf) { ngDevMode && assertTNodeForTView(tNode, lView[TVIEW]); let parentTNode = tNode; let parentLView = lView; while (true) { ngDevMode && assertDefined(parentTNode, 'Parent TNode should be defined'); parentTNode = parentTNode.parent; if (parentTNode === null && !(flags & InjectFlags.Host)) { parentTNode = getDeclarationTNode(parentLView); if (parentTNode === null) break; // In this case, a parent exists and is definitely an element. So it will definitely // have an existing lView as the declaration view, which is why we can assume it's defined. ngDevMode && assertDefined(parentLView, 'Parent LView should be defined'); parentLView = parentLView[DECLARATION_VIEW]; // In Ivy there are Comment nodes that correspond to ngIf and NgFor embedded directives // We want to skip those and look only at Elements and ElementContainers to ensure // we're looking at true parent nodes, and not content or other types. if (parentTNode.type & (2 /* TNodeType.Element */ | 8 /* TNodeType.ElementContainer */)) { break; } } else { break; } } if (parentTNode === null) { // If we failed to find a parent TNode this means that we should use module injector. return false; } else { tNode = parentTNode; lView = parentLView; } } ngDevMode && assertTNodeForLView(tNode, lView); const lFrame = instructionState.lFrame = allocLFrame(); lFrame.currentTNode = tNode; lFrame.lView = lView; return true; } /** * Swap the current lView with a new lView. * * For performance reasons we store the lView in the top level of the module. * This way we minimize the number of properties to read. Whenever a new view * is entered we have to store the lView for later, and when the view is * exited the state has to be restored * * @param newView New lView to become active * @returns the previously active lView; */ export function enterView(newView) { ngDevMode && assertNotEqual(newView[0], newView[1], '????'); ngDevMode && assertLViewOrUndefined(newView); const newLFrame = allocLFrame(); if (ngDevMode) { assertEqual(newLFrame.isParent, true, 'Expected clean LFrame'); assertEqual(newLFrame.lView, null, 'Expected clean LFrame'); assertEqual(newLFrame.tView, null, 'Expected clean LFrame'); assertEqual(newLFrame.selectedIndex, -1, 'Expected clean LFrame'); assertEqual(newLFrame.elementDepthCount, 0, 'Expected clean LFrame'); assertEqual(newLFrame.currentDirectiveIndex, -1, 'Expected clean LFrame'); assertEqual(newLFrame.currentNamespace, null, 'Expected clean LFrame'); assertEqual(newLFrame.bindingRootIndex, -1, 'Expected clean LFrame'); assertEqual(newLFrame.currentQueryIndex, 0, 'Expected clean LFrame'); } const tView = newView[TVIEW]; instructionState.lFrame = newLFrame; ngDevMode && tView.firstChild && assertTNodeForTView(tView.firstChild, tView); newLFrame.currentTNode = tView.firstChild; newLFrame.lView = newView; newLFrame.tView = tView; newLFrame.contextLView = newView; newLFrame.bindingIndex = tView.bindingStartIndex; newLFrame.inI18n = false; } /** * Allocates next free LFrame. This function tries to reuse the `LFrame`s to lower memory pressure. */ function allocLFrame() { const currentLFrame = instructionState.lFrame; const childLFrame = currentLFrame === null ? null : currentLFrame.child; const newLFrame = childLFrame === null ? createLFrame(currentLFrame) : childLFrame; return newLFrame; } function createLFrame(parent) { const lFrame = { currentTNode: null, isParent: true, lView: null, tView: null, selectedIndex: -1, contextLView: null, elementDepthCount: 0, currentNamespace: null, currentDirectiveIndex: -1, bindingRootIndex: -1, bindingIndex: -1, currentQueryIndex: 0, parent: parent, child: null, inI18n: false, }; parent !== null && (parent.child = lFrame); // link the new LFrame for reuse. return lFrame; } /** * A lightweight version of leave which is used with DI. * * This function only resets `currentTNode` and `LView` as those are the only properties * used with DI (`enterDI()`). * * NOTE: This function is reexported as `leaveDI`. However `leaveDI` has return type of `void` where * as `leaveViewLight` has `LFrame`. This is so that `leaveViewLight` can be used in `leaveView`. */ function leaveViewLight() { const oldLFrame = instructionState.lFrame; instructionState.lFrame = oldLFrame.parent; oldLFrame.currentTNode = null; oldLFrame.lView = null; return oldLFrame; } /** * This is a lightweight version of the `leaveView` which is needed by the DI system. * * NOTE: this function is an alias so that we can change the type of the function to have `void` * return type. */ export const leaveDI = leaveViewLight; /** * Leave the current `LView` * * This pops the `LFrame` with the associated `LView` from the stack. * * IMPORTANT: We must zero out the `LFrame` values here otherwise they will be retained. This is * because for performance reasons we don't release `LFrame` but rather keep it for next use. */ export function leaveView() { const oldLFrame = leaveViewLight(); oldLFrame.isParent = true; oldLFrame.tView = null; oldLFrame.selectedIndex = -1; oldLFrame.contextLView = null; oldLFrame.elementDepthCount = 0; oldLFrame.currentDirectiveIndex = -1; oldLFrame.currentNamespace = null; oldLFrame.bindingRootIndex = -1; oldLFrame.bindingIndex = -1; oldLFrame.currentQueryIndex = 0; } export function nextContextImpl(level) { const contextLView = instructionState.lFrame.contextLView = walkUpViews(level, instructionState.lFrame.contextLView); return contextLView[CONTEXT]; } function walkUpViews(nestingLevel, currentView) { while (nestingLevel > 0) { ngDevMode && assertDefined(currentView[DECLARATION_VIEW], 'Declaration view should be defined if nesting level is greater than 0.'); currentView = currentView[DECLARATION_VIEW]; nestingLevel--; } return currentView; } /** * Gets the currently selected element index. * * Used with {@link property} instruction (and more in the future) to identify the index in the * current `LView` to act on. */ export function getSelectedIndex() { return instructionState.lFrame.selectedIndex; } /** * Sets the most recent index passed to {@link select} * * Used with {@link property} instruction (and more in the future) to identify the index in the * current `LView` to act on. * * (Note that if an "exit function" was set earlier (via `setElementExitFn()`) then that will be * run if and when the provided `index` value is different from the current selected index value.) */ export function setSelectedIndex(index) { ngDevMode && index !== -1 && assertGreaterThanOrEqual(index, HEADER_OFFSET, 'Index must be past HEADER_OFFSET (or -1).'); ngDevMode && assertLessThan(index, instructionState.lFrame.lView.length, 'Can\'t set index passed end of LView'); instructionState.lFrame.selectedIndex = index; } /** * Gets the `tNode` that represents currently selected element. */ export function getSelectedTNode() { const lFrame = instructionState.lFrame; return getTNode(lFrame.tView, lFrame.selectedIndex); } /** * Sets the namespace used to create elements to `'http://www.w3.org/2000/svg'` in global state. * * @codeGenApi */ export function ɵɵnamespaceSVG() { instructionState.lFrame.currentNamespace = SVG_NAMESPACE; } /** * Sets the namespace used to create elements to `'http://www.w3.org/1998/MathML/'` in global state. * * @codeGenApi */ export function ɵɵnamespaceMathML() { instructionState.lFrame.currentNamespace = MATH_ML_NAMESPACE; } /** * Sets the namespace used to create elements to `null`, which forces element creation to use * `createElement` rather than `createElementNS`. * * @codeGenApi */ export function ɵɵnamespaceHTML() { namespaceHTMLInternal(); } /** * Sets the namespace used to create elements to `null`, which forces element creation to use * `createElement` rather than `createElementNS`. */ export function namespaceHTMLInternal() { instructionState.lFrame.currentNamespace = null; } export function getNamespace() { return instructionState.lFrame.currentNamespace; } let _wasLastNodeCreated = true; /** * Retrieves a global flag that indicates whether the most recent DOM node * was created or hydrated. */ export function wasLastNodeCreated() { return _wasLastNodeCreated; } /** * Sets a global flag to indicate whether the most recent DOM node * was created or hydrated. */ export function lastNodeWasCreated(flag) { _wasLastNodeCreated = flag; } //# 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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 {InjectFlags} from '../di/interface/injector';\nimport {assertDefined, assertEqual, assertGreaterThanOrEqual, assertLessThan, assertNotEqual, throwError} from '../util/assert';\n\nimport {assertLViewOrUndefined, assertTNodeForLView, assertTNodeForTView} from './assert';\nimport {DirectiveDef} from './interfaces/definition';\nimport {TNode, TNodeType} from './interfaces/node';\nimport {CONTEXT, DECLARATION_VIEW, HEADER_OFFSET, LView, OpaqueViewState, T_HOST, TData, TVIEW, TView, TViewType} from './interfaces/view';\nimport {MATH_ML_NAMESPACE, SVG_NAMESPACE} from './namespaces';\nimport {getTNode} from './util/view_utils';\n\n\n/**\n *\n */\ninterface LFrame {\n  /**\n   * Parent LFrame.\n   *\n   * This is needed when `leaveView` is called to restore the previous state.\n   */\n  parent: LFrame;\n\n  /**\n   * Child LFrame.\n   *\n   * This is used to cache existing LFrames to relieve the memory pressure.\n   */\n  child: LFrame|null;\n\n  /**\n   * State of the current view being processed.\n   *\n   * An array of nodes (text, element, container, etc), pipes, their bindings, and\n   * any local variables that need to be stored between invocations.\n   */\n  lView: LView;\n\n  /**\n   * Current `TView` associated with the `LFrame.lView`.\n   *\n   * One can get `TView` from `lFrame[TVIEW]` however because it is so common it makes sense to\n   * store it in `LFrame` for perf reasons.\n   */\n  tView: TView;\n\n  /**\n   * Used to set the parent property when nodes are created and track query results.\n   *\n   * This is used in conjunction with `isParent`.\n   */\n  currentTNode: TNode|null;\n\n  /**\n   * If `isParent` is:\n   *  - `true`: then `currentTNode` points to a parent node.\n   *  - `false`: then `currentTNode` points to previous node (sibling).\n   */\n  isParent: boolean;\n\n  /**\n   * Index of currently selected element in LView.\n   *\n   * Used by binding instructions. Updated as part of advance instruction.\n   */\n  selectedIndex: number;\n\n  /**\n   * Current pointer to the binding index.\n   */\n  bindingIndex: number;\n\n  /**\n   * The last viewData retrieved by nextContext().\n   * Allows building nextContext() and reference() calls.\n   *\n   * e.g. const inner = x().$implicit; const outer = x().$implicit;\n   */\n  contextLView: LView|null;\n\n  /**\n   * Store the element depth count. This is used to identify the root elements of the template\n   * so that we can then attach patch data `LView` to only those elements. We know that those\n   * are the only places where the patch data could change, this way we will save on number\n   * of places where tha patching occurs.\n   */\n  elementDepthCount: number;\n\n  /**\n   * Current namespace to be used when creating elements\n   */\n  currentNamespace: string|null;\n\n\n  /**\n   * The root index from which pure function instructions should calculate their binding\n   * indices. 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(i.e. `Hello �#2�World�/#2�!` pre-declares element at `�#2�` location.)\n   * This allocates `TNodeType.Placeholder` element at location `2`. If translator removes `�#2�`\n   * from translation than the runtime must also ensure tha element at `2` does not get inserted\n   * into the DOM. The translation does not carry information about deleted elements. Therefor the\n   * only way to know that an element is deleted is that it was not pre-declared in the translation.\n   *\n   * This flag works by ensuring that elements which are created without pre-declaration\n   * (`TNodeType.Placeholder`) are not inserted into the DOM render tree. (It does mean that the\n   * element still gets instantiated along with all of its behavior [directives])\n   */\n  inI18n: boolean;\n}\n\n/**\n * All implicit instruction state is stored here.\n *\n * It is useful to have a single object where all of the state is stored as a mental model\n * (rather it being spread across many different variables.)\n *\n * PERF NOTE: Turns out that writing to a true global variable is slower than\n * having an intermediate object with properties.\n */\ninterface InstructionState {\n  /**\n   * Current `LFrame`\n   *\n   * `null` if we have not called `enterView`\n   */\n  lFrame: LFrame;\n\n  /**\n   * Stores whether directives should be matched to elements.\n   *\n   * When template contains `ngNonBindable` then we need to prevent the runtime from matching\n   * directives on children of that element.\n   *\n   * Example:\n   * ```\n   * <my-comp my-directive>\n   *   Should match component / directive.\n   * </my-comp>\n   * <div ngNonBindable>\n   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instruction to save a snapshot\n * of the current view and restore it when listeners are invoked. This allows\n * walking the declaration view tree in listeners to get vars from parent views.\n *\n * @param viewToRestore The OpaqueViewState instance to restore.\n * @returns Context of the restored OpaqueViewState instance.\n *\n * @codeGenApi\n */\nexport function ɵɵrestoreView<T = any>(viewToRestore: OpaqueViewState): T {\n  instructionState.lFrame.contextLView = viewToRestore as any as LView;\n  return (viewToRestore as any as LView)[CONTEXT] as unknown as T;\n}\n\n\n/**\n * Clears the view set in `ɵɵrestoreView` from memory. Returns the passed in\n * value so that it can be used as a return value of an instruction.\n *\n * @codeGenApi\n */\nexport function ɵɵresetView<T>(value?: T): T|undefined {\n  instructionState.lFrame.contextLView = null;\n  return value;\n}\n\n\nexport function getCurrentTNode(): TNode|null {\n  let currentTNode = getCurrentTNodePlaceholderOk();\n  while (currentTNode !== null && currentTNode.type === TNodeType.Placeholder) {\n    currentTNode = currentTNode.parent;\n  }\n  return currentTNode;\n}\n\nexport function getCurrentTNodePlaceholderOk(): TNode|null {\n  return instructionState.lFrame.currentTNode;\n}\n\nexport function getCurrentParentTNode(): TNode|null {\n  const lFrame = instructionState.lFrame;\n  const currentTNode = lFrame.currentTNode;\n  return lFrame.isParent ? currentTNode : currentTNode!.parent;\n}\n\nexport function setCurrentTNode(tNode: TNode|null, isParent: boolean) {\n  ngDevMode && tNode && assertTNodeForTView(tNode, instructionState.lFrame.tView);\n  const lFrame = instructionState.lFrame;\n  lFrame.currentTNode = tNode;\n  lFrame.isParent = isParent;\n}\n\nexport function isCurrentTNodeParent(): boolean {\n  return instructionState.lFrame.isParent;\n}\n\nexport function setCurrentTNodeAsNotParent(): void {\n  instructionState.lFrame.isParent = false;\n}\n\nexport function getContextLView(): LView {\n  const contextLView = instructionState.lFrame.contextLView;\n  ngDevMode && assertDefined(contextLView, 'contextLView must be defined.');\n  return contextLView!;\n}\n\nexport function isInCheckNoChangesMode(): boolean {\n  !ngDevMode && throwError('Must never be called in production mode');\n  return _isInCheckNoChangesMode;\n}\n\nexport function setIsInCheckNoChangesMode(mode: boolean): void {\n  !ngDevMode && throwError('Must never be called in production mode');\n  _isInCheckNoChangesMode = mode;\n}\n\n// top level variables should not be exported for performance reasons (PERF_NOTES.md)\nexport function getBindingRoot() {\n  const lFrame = instructionState.lFrame;\n  let index = lFrame.bindingRootIndex;\n  if (index === -1) {\n    index = lFrame.bindingRootIndex = lFrame.tView.bindingStartIndex;\n  }\n  return index;\n}\n\nexport function getBindingIndex(): number {\n  return instructionState.lFrame.bindingIndex;\n}\n\nexport function setBindingIndex(value: number): number {\n  return instructionState.lFrame.bindingIndex = value;\n}\n\nexport function nextBindingIndex(): number {\n  return instructionState.lFrame.bindingIndex++;\n}\n\nexport function incrementBindingIndex(count: number): number {\n  const lFrame = instructionState.lFrame;\n  const index = lFrame.bindingIndex;\n  lFrame.bindingIndex = lFrame.bindingIndex + count;\n  return index;\n}\n\nexport function isInI18nBlock() {\n  return instructionState.lFrame.inI18n;\n}\n\nexport function setInI18nBlock(isInI18nBlock: boolean): void {\n  instructionState.lFrame.inI18n = isInI18nBlock;\n}\n\n/**\n * Set a new binding root index so that host template functions can execute.\n *\n * Bindings inside the host template are 0 index. But because we don't know ahead of time\n * how many host bindings we have we can't pre-compute them. For this reason they are all\n * 0 index and we just shift the root so that they match next available location in the LView.\n *\n * @param bindingRootIndex Root index for `hostBindings`\n * @param currentDirectiveIndex `TData[currentDirectiveIndex]` will point to the current directive\n *        whose `hostBindings` are being processed.\n */\nexport function setBindingRootForHostBindings(\n    bindingRootIndex: number, currentDirectiveIndex: number) {\n  const lFrame = instructionState.lFrame;\n  lFrame.bindingIndex = lFrame.bindingRootIndex = bindingRootIndex;\n  setCurrentDirectiveIndex(currentDirectiveIndex);\n}\n\n/**\n * When host binding is executing this points to the directive index.\n * `TView.data[getCurrentDirectiveIndex()]` is `DirectiveDef`\n * `LView[getCurrentDirectiveIndex()]` is directive instance.\n */\nexport function getCurrentDirectiveIndex(): number {\n  return instructionState.lFrame.currentDirectiveIndex;\n}\n\n/**\n * Sets an index of a directive whose `hostBindings` are being processed.\n *\n * @param currentDirectiveIndex `TData` index where current directive instance can be found.\n */\nexport function setCurrentDirectiveIndex(currentDirectiveIndex: number): void {\n  instructionState.lFrame.currentDirectiveIndex = currentDirectiveIndex;\n}\n\n/**\n * Retrieve the current `DirectiveDef` which is active when `hostBindings` instruction is being\n * executed.\n *\n * @param tData Current `TData` where the `DirectiveDef` will be looked up at.\n */\nexport function getCurrentDirectiveDef(tData: TData): DirectiveDef<any>|null {\n  const currentDirectiveIndex = instructionState.lFrame.currentDirectiveIndex;\n  return currentDirectiveIndex === -1 ? null : tData[currentDirectiveIndex] as DirectiveDef<any>;\n}\n\nexport function getCurrentQueryIndex(): number {\n  return instructionState.lFrame.currentQueryIndex;\n}\n\nexport function setCurrentQueryIndex(value: number): void {\n  instructionState.lFrame.currentQueryIndex = value;\n}\n\n/**\n * Returns a `TNode` of the location where the current `LView` is declared at.\n *\n * @param lView an `LView` that we want to find parent `TNode` for.\n */\nfunction getDeclarationTNode(lView: LView): TNode|null {\n  const tView = lView[TVIEW];\n\n  // Return the declaration parent for embedded views\n  if (tView.type === TViewType.Embedded) {\n    ngDevMode && assertDefined(tView.declTNode, 'Embedded TNodes should have declaration parents.');\n    return tView.declTNode;\n  }\n\n  // Components don't have `TView.declTNode` because each instance of component could be\n  // inserted in different location, hence `TView.declTNode` is meaningless.\n  // Falling back to `T_HOST` in case we cross component boundary.\n  if (tView.type === TViewType.Component) {\n    return lView[T_HOST];\n  }\n\n  // Remaining TNode type is `TViewType.Root` which doesn't have a parent TNode.\n  return null;\n}\n\n/**\n * This is a light weight version of the `enterView` which is needed by the DI system.\n *\n * @param lView `LView` location of the DI context.\n * @param tNode `TNode` for DI context\n * @param flags DI context flags. if `SkipSelf` flag is set than we walk up the declaration\n *     tree from `tNode`  until we find parent declared `TElementNode`.\n * @returns `true` if we have successfully entered DI associated with `tNode` (or with declared\n *     `TNode` if `flags` has  `SkipSelf`). Failing to enter DI implies that no associated\n *     `NodeInjector` can be found and we should instead use `ModuleInjector`.\n *     - If `true` than this call must be fallowed by `leaveDI`\n *     - If `false` than this call failed and we should NOT call `leaveDI`\n */\nexport function enterDI(lView: LView, tNode: TNode, flags: InjectFlags) {\n  ngDevMode && assertLViewOrUndefined(lView);\n\n  if (flags & InjectFlags.SkipSelf) {\n    ngDevMode && assertTNodeForTView(tNode, lView[TVIEW]);\n\n    let parentTNode = tNode as TNode | null;\n    let parentLView = lView;\n\n    while (true) {\n      ngDevMode && assertDefined(parentTNode, 'Parent TNode should be defined');\n      parentTNode = parentTNode!.parent as TNode | null;\n      if (parentTNode === null && !(flags & InjectFlags.Host)) {\n        parentTNode = getDeclarationTNode(parentLView);\n        if (parentTNode === null) break;\n\n        // In this case, a parent exists and is definitely an element. So it will definitely\n        // have an existing lView as the declaration view, which is why we can assume it's defined.\n        ngDevMode && assertDefined(parentLView, 'Parent LView should be defined');\n        parentLView = parentLView[DECLARATION_VIEW]!;\n\n        // In Ivy there are Comment nodes that correspond to ngIf and NgFor embedded directives\n        // We want to skip those and look only at Elements and ElementContainers to ensure\n        // we're looking at true parent nodes, and not content or other types.\n        if (parentTNode.type & (TNodeType.Element | TNodeType.ElementContainer)) {\n          break;\n        }\n      } else {\n        break;\n      }\n    }\n    if (parentTNode === null) {\n      // If we failed to find a parent TNode this means that we should use module injector.\n      return false;\n    } else {\n      tNode = parentTNode;\n      lView = parentLView;\n    }\n  }\n\n  ngDevMode && assertTNodeForLView(tNode, lView);\n  const lFrame = instructionState.lFrame = allocLFrame();\n  lFrame.currentTNode = tNode;\n  lFrame.lView = lView;\n\n  return true;\n}\n\n/**\n * Swap the current lView with a new lView.\n *\n * For performance reasons we store the lView in the top level of the module.\n * This way we minimize the number of properties to read. Whenever a new view\n * is entered we have to store the lView for later, and when the view is\n * exited the state has to be restored\n *\n * @param newView New lView to become active\n * @returns the previously active lView;\n */\nexport function enterView(newView: LView): void {\n  ngDevMode && assertNotEqual(newView[0], newView[1] as any, '????');\n  ngDevMode && assertLViewOrUndefined(newView);\n  const newLFrame = allocLFrame();\n  if (ngDevMode) {\n    assertEqual(newLFrame.isParent, true, 'Expected clean LFrame');\n    assertEqual(newLFrame.lView, null, 'Expected clean LFrame');\n    assertEqual(newLFrame.tView, null, 'Expected clean LFrame');\n    assertEqual(newLFrame.selectedIndex, -1, 'Expected clean LFrame');\n    assertEqual(newLFrame.elementDepthCount, 0, 'Expected clean LFrame');\n    assertEqual(newLFrame.currentDirectiveIndex, -1, 'Expected clean LFrame');\n    assertEqual(newLFrame.currentNamespace, null, 'Expected clean LFrame');\n    assertEqual(newLFrame.bindingRootIndex, -1, 'Expected clean LFrame');\n    assertEqual(newLFrame.currentQueryIndex, 0, 'Expected clean LFrame');\n  }\n  const tView = newView[TVIEW];\n  instructionState.lFrame = newLFrame;\n  ngDevMode && tView.firstChild && assertTNodeForTView(tView.firstChild, tView);\n  newLFrame.currentTNode = tView.firstChild!;\n  newLFrame.lView = newView;\n  newLFrame.tView = tView;\n  newLFrame.contextLView = newView;\n  newLFrame.bindingIndex = tView.bindingStartIndex;\n  newLFrame.inI18n = false;\n}\n\n/**\n * Allocates next free LFrame. This function tries to reuse the `LFrame`s to lower memory pressure.\n */\nfunction allocLFrame() {\n  const currentLFrame = instructionState.lFrame;\n  const childLFrame = currentLFrame === null ? null : currentLFrame.child;\n  const newLFrame = childLFrame === null ? createLFrame(currentLFrame) : childLFrame;\n  return newLFrame;\n}\n\nfunction createLFrame(parent: LFrame|null): LFrame {\n  const lFrame: LFrame = {\n    currentTNode: null,\n    isParent: true,\n    lView: null!,\n    tView: null!,\n    selectedIndex: -1,\n    contextLView: null,\n    elementDepthCount: 0,\n    currentNamespace: null,\n    currentDirectiveIndex: -1,\n    bindingRootIndex: -1,\n    bindingIndex: -1,\n    currentQueryIndex: 0,\n    parent: parent!,\n    child: null,\n    inI18n: false,\n  };\n  parent !== null && (parent.child = lFrame);  // link the new LFrame for reuse.\n  return lFrame;\n}\n\n/**\n * A lightweight version of leave which is used with DI.\n *\n * This function only resets `currentTNode` and `LView` as those are the only properties\n * used with DI (`enterDI()`).\n *\n * NOTE: This function is reexported as `leaveDI`. However `leaveDI` has return type of `void` where\n * as `leaveViewLight` has `LFrame`. This is so that `leaveViewLight` can be used in `leaveView`.\n */\nfunction leaveViewLight(): LFrame {\n  const oldLFrame = instructionState.lFrame;\n  instructionState.lFrame = oldLFrame.parent;\n  oldLFrame.currentTNode = null!;\n  oldLFrame.lView = null!;\n  return oldLFrame;\n}\n\n/**\n * This is a lightweight version of the `leaveView` which is needed by the DI system.\n *\n * NOTE: this function is an alias so that we can change the type of the function to have `void`\n * return type.\n */\nexport const leaveDI: () => void = leaveViewLight;\n\n/**\n * Leave the current `LView`\n *\n * This pops the `LFrame` with the associated `LView` from the stack.\n *\n * IMPORTANT: We must zero out the `LFrame` values here otherwise they will be retained. This is\n * because for performance reasons we don't release `LFrame` but rather keep it for next use.\n */\nexport function leaveView() {\n  const oldLFrame = leaveViewLight();\n  oldLFrame.isParent = true;\n  oldLFrame.tView = null!;\n  oldLFrame.selectedIndex = -1;\n  oldLFrame.contextLView = null;\n  oldLFrame.elementDepthCount = 0;\n  oldLFrame.currentDirectiveIndex = -1;\n  oldLFrame.currentNamespace = null;\n  oldLFrame.bindingRootIndex = -1;\n  oldLFrame.bindingIndex = -1;\n  oldLFrame.currentQueryIndex = 0;\n}\n\nexport function nextContextImpl<T = any>(level: number): T {\n  const contextLView = instructionState.lFrame.contextLView =\n      walkUpViews(level, instructionState.lFrame.contextLView!);\n  return contextLView[CONTEXT] as unknown as T;\n}\n\nfunction walkUpViews(nestingLevel: number, currentView: LView): LView {\n  while (nestingLevel > 0) {\n    ngDevMode &&\n        assertDefined(\n            currentView[DECLARATION_VIEW],\n            'Declaration view should be defined if nesting level is greater than 0.');\n    currentView = currentView[DECLARATION_VIEW]!;\n    nestingLevel--;\n  }\n  return currentView;\n}\n\n/**\n * Gets the currently selected element index.\n *\n * Used with {@link property} instruction (and more in the future) to identify the index in the\n * current `LView` to act on.\n */\nexport function getSelectedIndex() {\n  return instructionState.lFrame.selectedIndex;\n}\n\n/**\n * Sets the most recent index passed to {@link select}\n *\n * Used with {@link property} instruction (and more in the future) to identify the index in the\n * current `LView` to act on.\n *\n * (Note that if an \"exit function\" was set earlier (via `setElementExitFn()`) then that will be\n * run if and when the provided `index` value is different from the current selected index value.)\n */\nexport function setSelectedIndex(index: number) {\n  ngDevMode && index !== -1 &&\n      assertGreaterThanOrEqual(index, HEADER_OFFSET, 'Index must be past HEADER_OFFSET (or -1).');\n  ngDevMode &&\n      assertLessThan(\n          index, instructionState.lFrame.lView.length, 'Can\\'t set index passed end of LView');\n  instructionState.lFrame.selectedIndex = index;\n}\n\n/**\n * Gets the `tNode` that represents currently selected element.\n */\nexport function getSelectedTNode() {\n  const lFrame = instructionState.lFrame;\n  return getTNode(lFrame.tView, lFrame.selectedIndex);\n}\n\n/**\n * Sets the namespace used to create elements to `'http://www.w3.org/2000/svg'` in global state.\n *\n * @codeGenApi\n */\nexport function ɵɵnamespaceSVG() {\n  instructionState.lFrame.currentNamespace = SVG_NAMESPACE;\n}\n\n/**\n * Sets the namespace used to create elements to `'http://www.w3.org/1998/MathML/'` in global state.\n *\n * @codeGenApi\n */\nexport function ɵɵnamespaceMathML() {\n  instructionState.lFrame.currentNamespace = MATH_ML_NAMESPACE;\n}\n\n/**\n * Sets the namespace used to create elements to `null`, which forces element creation to use\n * `createElement` rather than `createElementNS`.\n *\n * @codeGenApi\n */\nexport function ɵɵnamespaceHTML() {\n  namespaceHTMLInternal();\n}\n\n/**\n * Sets the namespace used to create elements to `null`, which forces element creation to use\n * `createElement` rather than `createElementNS`.\n */\nexport function namespaceHTMLInternal() {\n  instructionState.lFrame.currentNamespace = null;\n}\n\nexport function getNamespace(): string|null {\n  return instructionState.lFrame.currentNamespace;\n}\n\nlet _wasLastNodeCreated = true;\n\n/**\n * Retrieves a global flag that indicates whether the most recent DOM node\n * was created or hydrated.\n */\nexport function wasLastNodeCreated(): boolean {\n  return _wasLastNodeCreated;\n}\n\n/**\n * Sets a global flag to indicate whether the most recent DOM node\n * was created or hydrated.\n */\nexport function lastNodeWasCreated(flag: boolean): void {\n  _wasLastNodeCreated = flag;\n}\n"]}