@angular/core
Version:
Angular - the core framework
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JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google Inc. 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 { assertDefined } from '../util/assert';
import { assertLViewOrUndefined } from './assert';
import { executeHooks } from './hooks';
import { BINDING_INDEX, CONTEXT, DECLARATION_VIEW, FLAGS, TVIEW } from './interfaces/view';
import { setCachedStylingContext } from './styling/state';
import { resetPreOrderHookFlags } from './util/view_utils';
/**
* Store the element depth count. This is used to identify the root elements of the template
* so that we can than attach `LView` to only those elements.
* @type {?}
*/
let elementDepthCount;
/**
* @return {?}
*/
export function getElementDepthCount() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return elementDepthCount;
}
/**
* @return {?}
*/
export function increaseElementDepthCount() {
elementDepthCount++;
}
/**
* @return {?}
*/
export function decreaseElementDepthCount() {
elementDepthCount--;
}
/** @type {?} */
let currentDirectiveDef = null;
/**
* @return {?}
*/
export function getCurrentDirectiveDef() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return currentDirectiveDef;
}
/**
* @param {?} def
* @return {?}
*/
export function setCurrentDirectiveDef(def) {
currentDirectiveDef = def;
}
/**
* Stores whether directives should be matched to elements.
*
* When template contains `ngNonBindable` than we need to prevent the runtime form matching
* directives on children of that element.
*
* Example:
* ```
* <my-comp my-directive>
* Should match component / directive.
* </my-comp>
* <div ngNonBindable>
* <my-comp my-directive>
* Should not match component / directive because we are in ngNonBindable.
* </my-comp>
* </div>
* ```
* @type {?}
*/
let bindingsEnabled;
/**
* @return {?}
*/
export function getBindingsEnabled() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return bindingsEnabled;
}
/**
* Enables directive matching on elements.
*
* * Example:
* ```
* <my-comp my-directive>
* Should match component / directive.
* </my-comp>
* <div ngNonBindable>
* <!-- ɵɵdisableBindings() -->
* <my-comp my-directive>
* Should not match component / directive because we are in ngNonBindable.
* </my-comp>
* <!-- ɵɵenableBindings() -->
* </div>
* ```
*
* \@codeGenApi
* @return {?}
*/
export function ɵɵenableBindings() {
bindingsEnabled = true;
}
/**
* Disables directive matching on element.
*
* * Example:
* ```
* <my-comp my-directive>
* Should match component / directive.
* </my-comp>
* <div ngNonBindable>
* <!-- ɵɵdisableBindings() -->
* <my-comp my-directive>
* Should not match component / directive because we are in ngNonBindable.
* </my-comp>
* <!-- ɵɵenableBindings() -->
* </div>
* ```
*
* \@codeGenApi
* @return {?}
*/
export function ɵɵdisableBindings() {
bindingsEnabled = false;
}
/**
* @return {?}
*/
export function getLView() {
return lView;
}
/**
* Used as the starting directive id value.
*
* All subsequent directives are incremented from this value onwards.
* The reason why this value is `1` instead of `0` is because the `0`
* value is reserved for the template.
* @type {?}
*/
const MIN_DIRECTIVE_ID = 1;
/** @type {?} */
let activeDirectiveId = MIN_DIRECTIVE_ID;
/**
* Position depth (with respect from leaf to root) in a directive sub-class inheritance chain.
* @type {?}
*/
let activeDirectiveSuperClassDepthPosition = 0;
/**
* Total count of how many directives are a part of an inheritance chain.
*
* When directives are sub-classed (extended) from one to another, Angular
* needs to keep track of exactly how many were encountered so it can accurately
* generate the next directive id (once the next directive id is visited).
* Normally the next directive id just a single incremented value from the
* previous one, however, if the previous directive is a part of an inheritance
* chain (a series of sub-classed directives) then the incremented value must
* also take into account the total amount of sub-classed values.
*
* Note that this value resets back to zero once the next directive is
* visited (when `incrementActiveDirectiveId` or `setActiveHostElement`
* is called).
* @type {?}
*/
let activeDirectiveSuperClassHeight = 0;
/**
* Sets the active directive host element and resets the directive id value
* (when the provided elementIndex value has changed).
*
* @param {?=} elementIndex the element index value for the host element where
* the directive/component instance lives
* @return {?}
*/
export function setActiveHostElement(elementIndex = null) {
if (_selectedIndex !== elementIndex) {
setSelectedIndex(elementIndex == null ? -1 : elementIndex);
activeDirectiveId = elementIndex == null ? 0 : MIN_DIRECTIVE_ID;
activeDirectiveSuperClassDepthPosition = 0;
activeDirectiveSuperClassHeight = 0;
}
}
/**
* Returns the current id value of the current directive.
*
* For example we have an element that has two directives on it:
* <div dir-one dir-two></div>
*
* dirOne->hostBindings() (id == 1)
* dirTwo->hostBindings() (id == 2)
*
* Note that this is only active when `hostBinding` functions are being processed.
*
* Note that directive id values are specific to an element (this means that
* the same id value could be present on another element with a completely
* different set of directives).
* @return {?}
*/
export function getActiveDirectiveId() {
return activeDirectiveId;
}
/**
* Increments the current directive id value.
*
* For example we have an element that has two directives on it:
* <div dir-one dir-two></div>
*
* dirOne->hostBindings() (index = 1)
* // increment
* dirTwo->hostBindings() (index = 2)
*
* Depending on whether or not a previous directive had any inherited
* directives present, that value will be incremented in addition
* to the id jumping up by one.
*
* Note that this is only active when `hostBinding` functions are being processed.
*
* Note that directive id values are specific to an element (this means that
* the same id value could be present on another element with a completely
* different set of directives).
* @return {?}
*/
export function incrementActiveDirectiveId() {
activeDirectiveId += 1 + activeDirectiveSuperClassHeight;
// because we are dealing with a new directive this
// means we have exited out of the inheritance chain
activeDirectiveSuperClassDepthPosition = 0;
activeDirectiveSuperClassHeight = 0;
}
/**
* Set the current super class (reverse inheritance) position depth for a directive.
*
* For example we have two directives: Child and Other (but Child is a sub-class of Parent)
* <div child-dir other-dir></div>
*
* // increment
* parentInstance->hostBindings() (depth = 1)
* // decrement
* childInstance->hostBindings() (depth = 0)
* otherInstance->hostBindings() (depth = 0 b/c it's a different directive)
*
* Note that this is only active when `hostBinding` functions are being processed.
* @param {?} delta
* @return {?}
*/
export function adjustActiveDirectiveSuperClassDepthPosition(delta) {
activeDirectiveSuperClassDepthPosition += delta;
// we keep track of the height value so that when the next directive is visited
// then Angular knows to generate a new directive id value which has taken into
// account how many sub-class directives were a part of the previous directive.
activeDirectiveSuperClassHeight =
Math.max(activeDirectiveSuperClassHeight, activeDirectiveSuperClassDepthPosition);
}
/**
* Returns he current depth of the super/sub class inheritance chain.
*
* This will return how many inherited directive/component classes
* exist in the current chain.
*
* ```typescript
* \@Directive({ selector: '[super-dir]' })
* class SuperDir {}
* / selector: '[sub-dir]' })
* class SubDir extends SuperDir {}
*
* // if `<div sub-dir>` is used then the super class height is `1`
* // if `<div super-dir>` is used then the super class height is `0`
* ```
* @return {?}
*/
export function getActiveDirectiveSuperClassHeight() {
return activeDirectiveSuperClassHeight;
}
/**
* Returns the current super class (reverse inheritance) depth for a directive.
*
* This is designed to help instruction code distinguish different hostBindings
* calls from each other when a directive has extended from another directive.
* Normally using the directive id value is enough, but with the case
* of parent/sub-class directive inheritance more information is required.
*
* Note that this is only active when `hostBinding` functions are being processed.
* @return {?}
*/
export function getActiveDirectiveSuperClassDepth() {
return activeDirectiveSuperClassDepthPosition;
}
/**
* 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.
*
* \@codeGenApi
* @param {?} viewToRestore The OpaqueViewState instance to restore.
*
* @return {?}
*/
export function ɵɵrestoreView(viewToRestore) {
contextLView = (/** @type {?} */ ((/** @type {?} */ (viewToRestore))));
}
/**
* Used to set the parent property when nodes are created and track query results.
* @type {?}
*/
let previousOrParentTNode;
/**
* @return {?}
*/
export function getPreviousOrParentTNode() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return previousOrParentTNode;
}
/**
* @param {?} tNode
* @param {?} _isParent
* @return {?}
*/
export function setPreviousOrParentTNode(tNode, _isParent) {
previousOrParentTNode = tNode;
isParent = _isParent;
}
/**
* @param {?} tNode
* @param {?} view
* @return {?}
*/
export function setTNodeAndViewData(tNode, view) {
ngDevMode && assertLViewOrUndefined(view);
previousOrParentTNode = tNode;
lView = view;
}
/**
* If `isParent` is:
* - `true`: then `previousOrParentTNode` points to a parent node.
* - `false`: then `previousOrParentTNode` points to previous node (sibling).
* @type {?}
*/
let isParent;
/**
* @return {?}
*/
export function getIsParent() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return isParent;
}
/**
* @return {?}
*/
export function setIsNotParent() {
isParent = false;
}
/**
* @return {?}
*/
export function setIsParent() {
isParent = true;
}
/**
* Checks whether a given view is in creation mode
* @param {?=} view
* @return {?}
*/
export function isCreationMode(view = lView) {
return (view[FLAGS] & 4 /* CreationMode */) === 4 /* CreationMode */;
}
/**
* State of the current view being processed.
*
* An array of nodes (text, element, container, etc), pipes, their bindings, and
* any local variables that need to be stored between invocations.
* @type {?}
*/
let lView;
/**
* The last viewData retrieved by nextContext().
* Allows building nextContext() and reference() calls.
*
* e.g. const inner = x().$implicit; const outer = x().$implicit;
* @type {?}
*/
let contextLView = (/** @type {?} */ (null));
/**
* @return {?}
*/
export function getContextLView() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return contextLView;
}
/**
* In this mode, any changes in bindings will throw an ExpressionChangedAfterChecked error.
*
* Necessary to support ChangeDetectorRef.checkNoChanges().
* @type {?}
*/
let checkNoChangesMode = false;
/**
* @return {?}
*/
export function getCheckNoChangesMode() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return checkNoChangesMode;
}
/**
* @param {?} mode
* @return {?}
*/
export function setCheckNoChangesMode(mode) {
checkNoChangesMode = mode;
}
/**
* The root index from which pure function instructions should calculate their binding
* indices. In component views, this is TView.bindingStartIndex. In a host binding
* context, this is the TView.expandoStartIndex + any dirs/hostVars before the given dir.
* @type {?}
*/
let bindingRootIndex = -1;
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
/**
* @return {?}
*/
export function getBindingRoot() {
return bindingRootIndex;
}
/**
* @param {?} value
* @return {?}
*/
export function setBindingRoot(value) {
bindingRootIndex = value;
}
/**
* Current index of a View or Content Query which needs to be processed next.
* We iterate over the list of Queries and increment current query index at every step.
* @type {?}
*/
let currentQueryIndex = 0;
/**
* @return {?}
*/
export function getCurrentQueryIndex() {
// top level variables should not be exported for performance reasons (PERF_NOTES.md)
return currentQueryIndex;
}
/**
* @param {?} value
* @return {?}
*/
export function setCurrentQueryIndex(value) {
currentQueryIndex = value;
}
/**
* Swap the current state with a new state.
*
* For performance reasons we store the state 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 state for later, and when the view is
* exited the state has to be restored
*
* @param {?} newView New state to become active
* @param {?} hostTNode
* @return {?} the previous state;
*/
export function enterView(newView, hostTNode) {
ngDevMode && assertLViewOrUndefined(newView);
/** @type {?} */
const oldView = lView;
if (newView) {
/** @type {?} */
const tView = newView[TVIEW];
bindingRootIndex = tView.bindingStartIndex;
}
previousOrParentTNode = (/** @type {?} */ (hostTNode));
isParent = true;
lView = contextLView = newView;
return oldView;
}
/**
* @template T
* @param {?=} level
* @return {?}
*/
export function nextContextImpl(level = 1) {
contextLView = walkUpViews(level, (/** @type {?} */ (contextLView)));
return (/** @type {?} */ (contextLView[CONTEXT]));
}
/**
* @param {?} nestingLevel
* @param {?} currentView
* @return {?}
*/
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 = (/** @type {?} */ (currentView[DECLARATION_VIEW]));
nestingLevel--;
}
return currentView;
}
/**
* Resets the application state.
* @return {?}
*/
export function resetComponentState() {
isParent = false;
previousOrParentTNode = (/** @type {?} */ (null));
elementDepthCount = 0;
bindingsEnabled = true;
}
/**
* Used in lieu of enterView to make it clear when we are exiting a child view. This makes
* the direction of traversal (up or down the view tree) a bit clearer.
*
* @param {?} newView New state to become active
* @param {?} safeToRunHooks Whether the runtime is in a state where running lifecycle hooks is valid.
* This is not always the case (for example, the application may have crashed and `leaveView` is
* being executed while unwinding the call stack).
* @return {?}
*/
export function leaveView(newView, safeToRunHooks) {
/** @type {?} */
const tView = lView[TVIEW];
if (isCreationMode(lView)) {
lView[FLAGS] &= ~4 /* CreationMode */;
}
else {
try {
resetPreOrderHookFlags(lView);
safeToRunHooks && executeHooks(lView, tView.viewHooks, tView.viewCheckHooks, checkNoChangesMode, 2 /* AfterViewInitHooksToBeRun */, undefined);
}
finally {
// Views are clean and in update mode after being checked, so these bits are cleared
lView[FLAGS] &= ~(64 /* Dirty */ | 8 /* FirstLViewPass */);
lView[BINDING_INDEX] = tView.bindingStartIndex;
}
}
setCachedStylingContext(null);
enterView(newView, null);
}
/** @type {?} */
let _selectedIndex = -1;
/**
* Gets 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.
* @return {?}
*/
export function getSelectedIndex() {
return _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.
* @param {?} index
* @return {?}
*/
export function setSelectedIndex(index) {
_selectedIndex = index;
// remove the styling context from the cache
// because we are now on a different element
setCachedStylingContext(null);
}
/** @type {?} */
let _currentNamespace = null;
/**
* Sets the namespace used to create elements to `'http://www.w3.org/2000/svg'` in global state.
*
* \@codeGenApi
* @return {?}
*/
export function ɵɵnamespaceSVG() {
_currentNamespace = 'http://www.w3.org/2000/svg';
}
/**
* Sets the namespace used to create elements to `'http://www.w3.org/1998/MathML/'` in global state.
*
* \@codeGenApi
* @return {?}
*/
export function ɵɵnamespaceMathML() {
_currentNamespace = 'http://www.w3.org/1998/MathML/';
}
/**
* Sets the namespace used to create elements no `null`, which forces element creation to use
* `createElement` rather than `createElementNS`.
*
* \@codeGenApi
* @return {?}
*/
export function ɵɵnamespaceHTML() {
_currentNamespace = null;
}
/**
* @return {?}
*/
export function getNamespace() {
return _currentNamespace;
}
//# 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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 {assertDefined, assertGreaterThan} from '../util/assert';\n\nimport {assertLViewOrUndefined} from './assert';\nimport {executeHooks} from './hooks';\nimport {ComponentDef, DirectiveDef} from './interfaces/definition';\nimport {TElementNode, TNode, TViewNode} from './interfaces/node';\nimport {BINDING_INDEX, CONTEXT, DECLARATION_VIEW, FLAGS, InitPhaseState, LView, LViewFlags, OpaqueViewState, TVIEW} from './interfaces/view';\nimport {setCachedStylingContext} from './styling/state';\nimport {resetPreOrderHookFlags} from './util/view_utils';\n\n\n\n/**\n * Store the element depth count. This is used to identify the root elements of the template\n * so that we can than attach `LView` to only those elements.\n */\nlet elementDepthCount !: number;\n\nexport function getElementDepthCount() {\n  // top level variables should not be exported for performance reasons (PERF_NOTES.md)\n  return elementDepthCount;\n}\n\nexport function increaseElementDepthCount() {\n  elementDepthCount++;\n}\n\nexport function decreaseElementDepthCount() {\n  elementDepthCount--;\n}\n\nlet currentDirectiveDef: DirectiveDef<any>|ComponentDef<any>|null = null;\n\nexport function getCurrentDirectiveDef(): DirectiveDef<any>|ComponentDef<any>|null {\n  // top level variables should not be exported for performance reasons (PERF_NOTES.md)\n  return currentDirectiveDef;\n}\n\nexport function setCurrentDirectiveDef(def: DirectiveDef<any>| ComponentDef<any>| null): void {\n  currentDirectiveDef = def;\n}\n\n/**\n * Stores whether directives should be matched to elements.\n *\n * When template contains `ngNonBindable` than we need to prevent the runtime form 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 */\nlet bindingsEnabled !: boolean;\n\nexport function getBindingsEnabled(): boolean {\n  // top level variables should not be exported for performance reasons (PERF_NOTES.md)\n  return 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  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  bindingsEnabled = false;\n}\n\nexport function getLView(): LView {\n  return lView;\n}\n\n/**\n * Used as the starting directive id value.\n *\n * All subsequent directives are incremented from this value onwards.\n * The reason why this value is `1` instead of `0` is because the `0`\n * value is reserved for the template.\n */\nconst MIN_DIRECTIVE_ID = 1;\n\nlet activeDirectiveId = MIN_DIRECTIVE_ID;\n\n/**\n * Position depth (with respect from leaf to root) in a directive sub-class inheritance chain.\n */\nlet activeDirectiveSuperClassDepthPosition = 0;\n\n/**\n * Total count of how many directives are a part of an inheritance chain.\n *\n * When directives are sub-classed (extended) from one to another, Angular\n * needs to keep track of exactly how many were encountered so it can accurately\n * generate the next directive id (once the next directive id is visited).\n * Normally the next directive id just a single incremented value from the\n * previous one, however, if the previous directive is a part of an inheritance\n * chain (a series of sub-classed directives) then the incremented value must\n * also take into account the total amount of sub-classed values.\n *\n * Note that this value resets back to zero once the next directive is\n * visited (when `incrementActiveDirectiveId` or `setActiveHostElement`\n * is called).\n */\nlet activeDirectiveSuperClassHeight = 0;\n\n/**\n * Sets the active directive host element and resets the directive id value\n * (when the provided elementIndex value has changed).\n *\n * @param elementIndex the element index value for the host element where\n *                     the directive/component instance lives\n */\nexport function setActiveHostElement(elementIndex: number | null = null) {\n  if (_selectedIndex !== elementIndex) {\n    setSelectedIndex(elementIndex == null ? 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In a host binding\n * context, this is the TView.expandoStartIndex + any dirs/hostVars before the given dir.\n */\nlet bindingRootIndex: number = -1;\n\n// top level variables should not be exported for performance reasons (PERF_NOTES.md)\nexport function getBindingRoot() {\n  return bindingRootIndex;\n}\n\nexport function setBindingRoot(value: number) {\n  bindingRootIndex = value;\n}\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 */\nlet currentQueryIndex: number = 0;\n\nexport function getCurrentQueryIndex(): number {\n  // top level variables should not be exported for performance reasons (PERF_NOTES.md)\n  return currentQueryIndex;\n}\n\nexport function setCurrentQueryIndex(value: number): void {\n  currentQueryIndex = value;\n}\n\n/**\n * Swap the current state with a new state.\n *\n * For performance reasons we store the state 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 state for later, and when the view is\n * exited the state has to be restored\n *\n * @param newView New state to become active\n * @param host Element to which the View is a child of\n * @returns the previous state;\n */\nexport function enterView(newView: LView, hostTNode: TElementNode | TViewNode | null): LView {\n  ngDevMode && assertLViewOrUndefined(newView);\n  const oldView = lView;\n  if (newView) {\n    const tView = newView[TVIEW];\n    bindingRootIndex = tView.bindingStartIndex;\n  }\n\n  previousOrParentTNode = hostTNode !;\n  isParent = true;\n\n  lView = contextLView = newView;\n  return oldView;\n}\n\nexport function nextContextImpl<T = any>(level: number = 1): T {\n  contextLView = walkUpViews(level, contextLView !);\n  return contextLView[CONTEXT] as T;\n}\n\nfunction walkUpViews(nestingLevel: number, currentView: LView): LView {\n  while (nestingLevel > 0) {\n    ngDevMode && 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 * Resets the application state.\n */\nexport function resetComponentState() {\n  isParent = false;\n  previousOrParentTNode = null !;\n  elementDepthCount = 0;\n  bindingsEnabled = true;\n}\n\n/**\n * Used in lieu of enterView to make it clear when we are exiting a child view. This makes\n * the direction of traversal (up or down the view tree) a bit clearer.\n *\n * @param newView New state to become active\n * @param safeToRunHooks Whether the runtime is in a state where running lifecycle hooks is valid.\n * This is not always the case (for example, the application may have crashed and `leaveView` is\n * being executed while unwinding the call stack).\n */\nexport function leaveView(newView: LView, safeToRunHooks: boolean): void {\n  const tView = lView[TVIEW];\n  if (isCreationMode(lView)) {\n    lView[FLAGS] &= ~LViewFlags.CreationMode;\n  } else {\n    try {\n      resetPreOrderHookFlags(lView);\n      safeToRunHooks && executeHooks(\n                            lView, tView.viewHooks, tView.viewCheckHooks, checkNoChangesMode,\n                            InitPhaseState.AfterViewInitHooksToBeRun, undefined);\n    } finally {\n      // Views are clean and in update mode after being checked, so these bits are cleared\n      lView[FLAGS] &= ~(LViewFlags.Dirty | LViewFlags.FirstLViewPass);\n      lView[BINDING_INDEX] = tView.bindingStartIndex;\n    }\n  }\n  setCachedStylingContext(null);\n  enterView(newView, null);\n}\n\nlet _selectedIndex = -1;\n\n/**\n * Gets 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 */\nexport function getSelectedIndex() {\n  return _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 */\nexport function setSelectedIndex(index: number) {\n  _selectedIndex = index;\n\n  // remove the styling context from the cache\n  // because we are now on a different element\n  setCachedStylingContext(null);\n}\n\n\nlet _currentNamespace: string|null = null;\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  _currentNamespace = 'http://www.w3.org/2000/svg';\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  _currentNamespace = 'http://www.w3.org/1998/MathML/';\n}\n\n/**\n * Sets the namespace used to create elements no `null`, which forces element creation to use\n * `createElement` rather than `createElementNS`.\n *\n * @codeGenApi\n */\nexport function ɵɵnamespaceHTML() {\n  _currentNamespace = null;\n}\n\nexport function getNamespace(): string|null {\n  return _currentNamespace;\n}\n"]}