/**
* @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,
};
/**
* 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;
}
/**
* 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;
}
/**
* 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;
}
/**
* 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 setCurrentTNodeAsParent() {
instructionState.lFrame.isParent = true;
}
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;
}
//# 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 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. In component views, this is TView.bindingStartIndex. In a host binding\n   * context, this is the TView.expandoStartIndex + any dirs/hostVars before the given dir.\n   */\n  bindingRootIndex: number;\n\n  /**\n   * Current index of a View or Content Query which needs to be processed next.\n   * We iterate over the list of Queries and increment current query index at every step.\n   */\n  currentQueryIndex: number;\n\n  /**\n   * When host binding is executing this points to the directive index.\n   * `TView.data[currentDirectiveIndex]` is `DirectiveDef`\n   * `LView[currentDirectiveIndex]` is directive instance.\n   */\n  currentDirectiveIndex: number;\n\n  /**\n   * Are we currently in i18n block as denoted by `ɵɵelementStart` and `ɵɵelementEnd`.\n   *\n   * This information is needed because while we are in i18n block all elements must be pre-declared\n   * in the translation. (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   *   <my-comp my-directive>\n   *     Should not match component / directive because we are in ngNonBindable.\n   *   </my-comp>\n   * </div>\n   * ```\n   */\n  bindingsEnabled: boolean;\n}\n\nconst instructionState: InstructionState = {\n  lFrame: createLFrame(null),\n  bindingsEnabled: true,\n};\n\n/**\n * In this mode, any changes in bindings will throw an ExpressionChangedAfterChecked error.\n *\n * Necessary to support ChangeDetectorRef.checkNoChanges().\n *\n * The `checkNoChanges` function is invoked only in ngDevMode=true and verifies that no unintended\n * changes exist in the change detector or its children.\n */\nlet _isInCheckNoChangesMode = false;\n\n/**\n * Returns true if the instruction state stack is empty.\n *\n * Intended to be called from tests only (tree shaken otherwise).\n */\nexport function specOnlyIsInstructionStateEmpty(): boolean {\n  return instructionState.lFrame.parent === null;\n}\n\n\nexport function getElementDepthCount() {\n  return instructionState.lFrame.elementDepthCount;\n}\n\nexport function increaseElementDepthCount() {\n  instructionState.lFrame.elementDepthCount++;\n}\n\nexport function decreaseElementDepthCount() {\n  instructionState.lFrame.elementDepthCount--;\n}\n\nexport function getBindingsEnabled(): boolean {\n  return instructionState.bindingsEnabled;\n}\n\n\n/**\n * Enables directive matching on elements.\n *\n *  * Example:\n * ```\n * <my-comp my-directive>\n *   Should match component / directive.\n * </my-comp>\n * <div ngNonBindable>\n *   <!-- ɵɵdisableBindings() -->\n *   <my-comp my-directive>\n *     Should not match component / directive because we are in ngNonBindable.\n *   </my-comp>\n *   <!-- ɵɵenableBindings() -->\n * </div>\n * ```\n *\n * @codeGenApi\n */\nexport function ɵɵenableBindings(): void {\n  instructionState.bindingsEnabled = true;\n}\n\n/**\n * Disables directive matching on element.\n *\n *  * Example:\n * ```\n * <my-comp my-directive>\n *   Should match component / directive.\n * </my-comp>\n * <div ngNonBindable>\n *   <!-- ɵɵdisableBindings() -->\n *   <my-comp my-directive>\n *     Should not match component / directive because we are in ngNonBindable.\n *   </my-comp>\n *   <!-- ɵɵenableBindings() -->\n * </div>\n * ```\n *\n * @codeGenApi\n */\nexport function ɵɵdisableBindings(): void {\n  instructionState.bindingsEnabled = false;\n}\n\n/**\n * Return the current `LView`.\n */\nexport function getLView<T>(): LView<T> {\n  return instructionState.lFrame.lView as LView<T>;\n}\n\n/**\n * Return the current `TView`.\n */\nexport function getTView(): TView {\n  return instructionState.lFrame.tView;\n}\n\n/**\n * Restores `contextViewData` to the given OpaqueViewState instance.\n *\n * Used in conjunction with the getCurrentView() 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}\nexport function setCurrentTNodeAsParent(): void {\n  instructionState.lFrame.isParent = true;\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"]}