source: trip-planner-front/node_modules/@angular/core/esm2015/src/linker/view_container_ref.js@ fa375fe

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { assertNodeInjector } from '../render3/assert';
9import { getParentInjectorLocation, NodeInjector } from '../render3/di';
10import { addToViewTree, createLContainer } from '../render3/instructions/shared';
11import { CONTAINER_HEADER_OFFSET, NATIVE, VIEW_REFS } from '../render3/interfaces/container';
12import { isLContainer } from '../render3/interfaces/type_checks';
13import { PARENT, RENDERER, T_HOST, TVIEW } from '../render3/interfaces/view';
14import { assertTNodeType } from '../render3/node_assert';
15import { addViewToContainer, destroyLView, detachView, getBeforeNodeForView, insertView, nativeInsertBefore, nativeNextSibling, nativeParentNode } from '../render3/node_manipulation';
16import { getCurrentTNode, getLView } from '../render3/state';
17import { getParentInjectorIndex, getParentInjectorView, hasParentInjector } from '../render3/util/injector_utils';
18import { getNativeByTNode, unwrapRNode, viewAttachedToContainer } from '../render3/util/view_utils';
19import { ViewRef as R3ViewRef } from '../render3/view_ref';
20import { addToArray, removeFromArray } from '../util/array_utils';
21import { assertEqual, assertGreaterThan, assertLessThan } from '../util/assert';
22import { noop } from '../util/noop';
23import { createElementRef } from './element_ref';
24import { NgModuleRef } from './ng_module_factory';
25export const SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ = injectViewContainerRef;
26const SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__ = noop;
27const SWITCH_VIEW_CONTAINER_REF_FACTORY = SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__;
28/**
29 * Represents a container where one or more views can be attached to a component.
30 *
31 * Can contain *host views* (created by instantiating a
32 * component with the `createComponent()` method), and *embedded views*
33 * (created by instantiating a `TemplateRef` with the `createEmbeddedView()` method).
34 *
35 * A view container instance can contain other view containers,
36 * creating a [view hierarchy](guide/glossary#view-tree).
37 *
38 * @see `ComponentRef`
39 * @see `EmbeddedViewRef`
40 *
41 * @publicApi
42 */
43export class ViewContainerRef {
44}
45/**
46 * @internal
47 * @nocollapse
48 */
49ViewContainerRef.__NG_ELEMENT_ID__ = SWITCH_VIEW_CONTAINER_REF_FACTORY;
50/**
51 * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef
52 * already exists, retrieves the existing ViewContainerRef.
53 *
54 * @returns The ViewContainerRef instance to use
55 */
56export function injectViewContainerRef() {
57 const previousTNode = getCurrentTNode();
58 return createContainerRef(previousTNode, getLView());
59}
60const VE_ViewContainerRef = ViewContainerRef;
61const R3ViewContainerRef = class ViewContainerRef extends VE_ViewContainerRef {
62 constructor(_lContainer, _hostTNode, _hostLView) {
63 super();
64 this._lContainer = _lContainer;
65 this._hostTNode = _hostTNode;
66 this._hostLView = _hostLView;
67 }
68 get element() {
69 return createElementRef(this._hostTNode, this._hostLView);
70 }
71 get injector() {
72 return new NodeInjector(this._hostTNode, this._hostLView);
73 }
74 /** @deprecated No replacement */
75 get parentInjector() {
76 const parentLocation = getParentInjectorLocation(this._hostTNode, this._hostLView);
77 if (hasParentInjector(parentLocation)) {
78 const parentView = getParentInjectorView(parentLocation, this._hostLView);
79 const injectorIndex = getParentInjectorIndex(parentLocation);
80 ngDevMode && assertNodeInjector(parentView, injectorIndex);
81 const parentTNode = parentView[TVIEW].data[injectorIndex + 8 /* TNODE */];
82 return new NodeInjector(parentTNode, parentView);
83 }
84 else {
85 return new NodeInjector(null, this._hostLView);
86 }
87 }
88 clear() {
89 while (this.length > 0) {
90 this.remove(this.length - 1);
91 }
92 }
93 get(index) {
94 const viewRefs = getViewRefs(this._lContainer);
95 return viewRefs !== null && viewRefs[index] || null;
96 }
97 get length() {
98 return this._lContainer.length - CONTAINER_HEADER_OFFSET;
99 }
100 createEmbeddedView(templateRef, context, index) {
101 const viewRef = templateRef.createEmbeddedView(context || {});
102 this.insert(viewRef, index);
103 return viewRef;
104 }
105 createComponent(componentFactory, index, injector, projectableNodes, ngModuleRef) {
106 const contextInjector = injector || this.parentInjector;
107 if (!ngModuleRef && componentFactory.ngModule == null && contextInjector) {
108 // DO NOT REFACTOR. The code here used to have a `value || undefined` expression
109 // which seems to cause internal google apps to fail. This is documented in the
110 // following internal bug issue: go/b/142967802
111 const result = contextInjector.get(NgModuleRef, null);
112 if (result) {
113 ngModuleRef = result;
114 }
115 }
116 const componentRef = componentFactory.create(contextInjector, projectableNodes, undefined, ngModuleRef);
117 this.insert(componentRef.hostView, index);
118 return componentRef;
119 }
120 insert(viewRef, index) {
121 const lView = viewRef._lView;
122 const tView = lView[TVIEW];
123 if (ngDevMode && viewRef.destroyed) {
124 throw new Error('Cannot insert a destroyed View in a ViewContainer!');
125 }
126 if (viewAttachedToContainer(lView)) {
127 // If view is already attached, detach it first so we clean up references appropriately.
128 const prevIdx = this.indexOf(viewRef);
129 // A view might be attached either to this or a different container. The `prevIdx` for
130 // those cases will be:
131 // equal to -1 for views attached to this ViewContainerRef
132 // >= 0 for views attached to a different ViewContainerRef
133 if (prevIdx !== -1) {
134 this.detach(prevIdx);
135 }
136 else {
137 const prevLContainer = lView[PARENT];
138 ngDevMode &&
139 assertEqual(isLContainer(prevLContainer), true, 'An attached view should have its PARENT point to a container.');
140 // We need to re-create a R3ViewContainerRef instance since those are not stored on
141 // LView (nor anywhere else).
142 const prevVCRef = new R3ViewContainerRef(prevLContainer, prevLContainer[T_HOST], prevLContainer[PARENT]);
143 prevVCRef.detach(prevVCRef.indexOf(viewRef));
144 }
145 }
146 // Logical operation of adding `LView` to `LContainer`
147 const adjustedIdx = this._adjustIndex(index);
148 const lContainer = this._lContainer;
149 insertView(tView, lView, lContainer, adjustedIdx);
150 // Physical operation of adding the DOM nodes.
151 const beforeNode = getBeforeNodeForView(adjustedIdx, lContainer);
152 const renderer = lView[RENDERER];
153 const parentRNode = nativeParentNode(renderer, lContainer[NATIVE]);
154 if (parentRNode !== null) {
155 addViewToContainer(tView, lContainer[T_HOST], renderer, lView, parentRNode, beforeNode);
156 }
157 viewRef.attachToViewContainerRef();
158 addToArray(getOrCreateViewRefs(lContainer), adjustedIdx, viewRef);
159 return viewRef;
160 }
161 move(viewRef, newIndex) {
162 if (ngDevMode && viewRef.destroyed) {
163 throw new Error('Cannot move a destroyed View in a ViewContainer!');
164 }
165 return this.insert(viewRef, newIndex);
166 }
167 indexOf(viewRef) {
168 const viewRefsArr = getViewRefs(this._lContainer);
169 return viewRefsArr !== null ? viewRefsArr.indexOf(viewRef) : -1;
170 }
171 remove(index) {
172 const adjustedIdx = this._adjustIndex(index, -1);
173 const detachedView = detachView(this._lContainer, adjustedIdx);
174 if (detachedView) {
175 // Before destroying the view, remove it from the container's array of `ViewRef`s.
176 // This ensures the view container length is updated before calling
177 // `destroyLView`, which could recursively call view container methods that
178 // rely on an accurate container length.
179 // (e.g. a method on this view container being called by a child directive's OnDestroy
180 // lifecycle hook)
181 removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx);
182 destroyLView(detachedView[TVIEW], detachedView);
183 }
184 }
185 detach(index) {
186 const adjustedIdx = this._adjustIndex(index, -1);
187 const view = detachView(this._lContainer, adjustedIdx);
188 const wasDetached = view && removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx) != null;
189 return wasDetached ? new R3ViewRef(view) : null;
190 }
191 _adjustIndex(index, shift = 0) {
192 if (index == null) {
193 return this.length + shift;
194 }
195 if (ngDevMode) {
196 assertGreaterThan(index, -1, `ViewRef index must be positive, got ${index}`);
197 // +1 because it's legal to insert at the end.
198 assertLessThan(index, this.length + 1 + shift, 'index');
199 }
200 return index;
201 }
202};
203function getViewRefs(lContainer) {
204 return lContainer[VIEW_REFS];
205}
206function getOrCreateViewRefs(lContainer) {
207 return (lContainer[VIEW_REFS] || (lContainer[VIEW_REFS] = []));
208}
209/**
210 * Creates a ViewContainerRef and stores it on the injector.
211 *
212 * @param ViewContainerRefToken The ViewContainerRef type
213 * @param ElementRefToken The ElementRef type
214 * @param hostTNode The node that is requesting a ViewContainerRef
215 * @param hostLView The view to which the node belongs
216 * @returns The ViewContainerRef instance to use
217 */
218export function createContainerRef(hostTNode, hostLView) {
219 ngDevMode && assertTNodeType(hostTNode, 12 /* AnyContainer */ | 3 /* AnyRNode */);
220 let lContainer;
221 const slotValue = hostLView[hostTNode.index];
222 if (isLContainer(slotValue)) {
223 // If the host is a container, we don't need to create a new LContainer
224 lContainer = slotValue;
225 }
226 else {
227 let commentNode;
228 // If the host is an element container, the native host element is guaranteed to be a
229 // comment and we can reuse that comment as anchor element for the new LContainer.
230 // The comment node in question is already part of the DOM structure so we don't need to append
231 // it again.
232 if (hostTNode.type & 8 /* ElementContainer */) {
233 commentNode = unwrapRNode(slotValue);
234 }
235 else {
236 // If the host is a regular element, we have to insert a comment node manually which will
237 // be used as an anchor when inserting elements. In this specific case we use low-level DOM
238 // manipulation to insert it.
239 const renderer = hostLView[RENDERER];
240 ngDevMode && ngDevMode.rendererCreateComment++;
241 commentNode = renderer.createComment(ngDevMode ? 'container' : '');
242 const hostNative = getNativeByTNode(hostTNode, hostLView);
243 const parentOfHostNative = nativeParentNode(renderer, hostNative);
244 nativeInsertBefore(renderer, parentOfHostNative, commentNode, nativeNextSibling(renderer, hostNative), false);
245 }
246 hostLView[hostTNode.index] = lContainer =
247 createLContainer(slotValue, hostLView, commentNode, hostTNode);
248 addToViewTree(hostLView, lContainer);
249 }
250 return new R3ViewContainerRef(lContainer, hostTNode, hostLView);
251}
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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 {Injector} from '../di/injector';\nimport {assertNodeInjector} from '../render3/assert';\nimport {getParentInjectorLocation, NodeInjector} from '../render3/di';\nimport {addToViewTree, createLContainer} from '../render3/instructions/shared';\nimport {CONTAINER_HEADER_OFFSET, LContainer, NATIVE, VIEW_REFS} from '../render3/interfaces/container';\nimport {NodeInjectorOffset} from '../render3/interfaces/injector';\nimport {TContainerNode, TDirectiveHostNode, TElementContainerNode, TElementNode, TNodeType} from '../render3/interfaces/node';\nimport {RComment, RElement} from '../render3/interfaces/renderer_dom';\nimport {isLContainer} from '../render3/interfaces/type_checks';\nimport {LView, PARENT, RENDERER, T_HOST, TVIEW} from '../render3/interfaces/view';\nimport {assertTNodeType} from '../render3/node_assert';\nimport {addViewToContainer, destroyLView, detachView, getBeforeNodeForView, insertView, nativeInsertBefore, nativeNextSibling, nativeParentNode} from '../render3/node_manipulation';\nimport {getCurrentTNode, getLView} from '../render3/state';\nimport {getParentInjectorIndex, getParentInjectorView, hasParentInjector} from '../render3/util/injector_utils';\nimport {getNativeByTNode, unwrapRNode, viewAttachedToContainer} from '../render3/util/view_utils';\nimport {ViewRef as R3ViewRef} from '../render3/view_ref';\nimport {addToArray, removeFromArray} from '../util/array_utils';\nimport {assertEqual, assertGreaterThan, assertLessThan} from '../util/assert';\nimport {noop} from '../util/noop';\nimport {ComponentFactory, ComponentRef} from './component_factory';\nimport {createElementRef, ElementRef} from './element_ref';\nimport {NgModuleRef} from './ng_module_factory';\nimport {TemplateRef} from './template_ref';\nimport {EmbeddedViewRef, ViewRef} from './view_ref';\n\n\nexport const SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ = injectViewContainerRef;\nconst SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__ = noop as typeof injectViewContainerRef;\nconst SWITCH_VIEW_CONTAINER_REF_FACTORY: typeof injectViewContainerRef =\n    SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__;\n\n/**\n * Represents a container where one or more views can be attached to a component.\n *\n * Can contain *host views* (created by instantiating a\n * component with the `createComponent()` method), and *embedded views*\n * (created by instantiating a `TemplateRef` with the `createEmbeddedView()` method).\n *\n * A view container instance can contain other view containers,\n * creating a [view hierarchy](guide/glossary#view-tree).\n *\n * @see `ComponentRef`\n * @see `EmbeddedViewRef`\n *\n * @publicApi\n */\nexport abstract class ViewContainerRef {\n  /**\n   * Anchor element that specifies the location of this container in the containing view.\n   * Each view container can have only one anchor element, and each anchor element\n   * can have only a single view container.\n   *\n   * Root elements of views attached to this container become siblings of the anchor element in\n   * the rendered view.\n   *\n   * Access the `ViewContainerRef` of an element by placing a `Directive` injected\n   * with `ViewContainerRef` on the element, or use a `ViewChild` query.\n   *\n   * <!-- TODO: rename to anchorElement -->\n   */\n  abstract get element(): ElementRef;\n\n  /**\n   * The [dependency injector](guide/glossary#injector) for this view container.\n   */\n  abstract get injector(): Injector;\n\n  /** @deprecated No replacement */\n  abstract get parentInjector(): Injector;\n\n  /**\n   * Destroys all views in this container.\n   */\n  abstract clear(): void;\n\n  /**\n   * Retrieves a view from this container.\n   * @param index The 0-based index of the view to retrieve.\n   * @returns The `ViewRef` instance, or null if the index is out of range.\n   */\n  abstract get(index: number): ViewRef|null;\n\n  /**\n   * Reports how many views are currently attached to this container.\n   * @returns The number of views.\n   */\n  abstract get length(): number;\n\n  /**\n   * Instantiates an embedded view and inserts it\n   * into this container.\n   * @param templateRef The HTML template that defines the view.\n   * @param context The data-binding context of the embedded view, as declared\n   * in the `<ng-template>` usage.\n   * @param index The 0-based index at which to insert the new view into this container.\n   * If not specified, appends the new view as the last entry.\n   *\n   * @returns The `ViewRef` instance for the newly created view.\n   */\n  abstract createEmbeddedView<C>(templateRef: TemplateRef<C>, context?: C, index?: number):\n      EmbeddedViewRef<C>;\n\n  /**\n   * Instantiates a single component and inserts its host view into this container.\n   *\n   * @param componentFactory The factory to use.\n   * @param index The index at which to insert the new component's host view into this container.\n   * If not specified, appends the new view as the last entry.\n   * @param injector The injector to use as the parent for the new component.\n   * @param projectableNodes\n   * @param ngModule\n   *\n   * @returns The new component instance, containing the host view.\n   *\n   */\n  abstract createComponent<C>(\n      componentFactory: ComponentFactory<C>, index?: number, injector?: Injector,\n      projectableNodes?: any[][], ngModule?: NgModuleRef<any>): ComponentRef<C>;\n\n  /**\n   * Inserts a view into this container.\n   * @param viewRef The view to insert.\n   * @param index The 0-based index at which to insert the view.\n   * If not specified, appends the new view as the last entry.\n   * @returns The inserted `ViewRef` instance.\n   *\n   */\n  abstract insert(viewRef: ViewRef, index?: number): ViewRef;\n\n  /**\n   * Moves a view to a new location in this container.\n   * @param viewRef The view to move.\n   * @param index The 0-based index of the new location.\n   * @returns The moved `ViewRef` instance.\n   */\n  abstract move(viewRef: ViewRef, currentIndex: number): ViewRef;\n\n  /**\n   * Returns the index of a view within the current container.\n   * @param viewRef The view to query.\n   * @returns The 0-based index of the view's position in this container,\n   * or `-1` if this container doesn't contain the view.\n   */\n  abstract indexOf(viewRef: ViewRef): number;\n\n  /**\n   * Destroys a view attached to this container\n   * @param index The 0-based index of the view to destroy.\n   * If not specified, the last view in the container is removed.\n   */\n  abstract remove(index?: number): void;\n\n  /**\n   * Detaches a view from this container without destroying it.\n   * Use along with `insert()` to move a view within the current container.\n   * @param index The 0-based index of the view to detach.\n   * If not specified, the last view in the container is detached.\n   */\n  abstract detach(index?: number): ViewRef|null;\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__: () => ViewContainerRef = SWITCH_VIEW_CONTAINER_REF_FACTORY;\n}\n\n/**\n * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef\n * already exists, retrieves the existing ViewContainerRef.\n *\n * @returns The ViewContainerRef instance to use\n */\nexport function injectViewContainerRef(): ViewContainerRef {\n  const previousTNode = getCurrentTNode() as TElementNode | TElementContainerNode | TContainerNode;\n  return createContainerRef(previousTNode, getLView());\n}\n\nconst VE_ViewContainerRef = ViewContainerRef;\n\nconst R3ViewContainerRef = class ViewContainerRef extends VE_ViewContainerRef {\n  constructor(\n      private _lContainer: LContainer,\n      private _hostTNode: TElementNode|TContainerNode|TElementContainerNode,\n      private _hostLView: LView) {\n    super();\n  }\n\n  override get element(): ElementRef {\n    return createElementRef(this._hostTNode, this._hostLView);\n  }\n\n  override get injector(): Injector {\n    return new NodeInjector(this._hostTNode, this._hostLView);\n  }\n\n  /** @deprecated No replacement */\n  override get parentInjector(): Injector {\n    const parentLocation = getParentInjectorLocation(this._hostTNode, this._hostLView);\n    if (hasParentInjector(parentLocation)) {\n      const parentView = getParentInjectorView(parentLocation, this._hostLView);\n      const injectorIndex = getParentInjectorIndex(parentLocation);\n      ngDevMode && assertNodeInjector(parentView, injectorIndex);\n      const parentTNode =\n          parentView[TVIEW].data[injectorIndex + NodeInjectorOffset.TNODE] as TElementNode;\n      return new NodeInjector(parentTNode, parentView);\n    } else {\n      return new NodeInjector(null, this._hostLView);\n    }\n  }\n\n  override clear(): void {\n    while (this.length > 0) {\n      this.remove(this.length - 1);\n    }\n  }\n\n  override get(index: number): ViewRef|null {\n    const viewRefs = getViewRefs(this._lContainer);\n    return viewRefs !== null && viewRefs[index] || null;\n  }\n\n  override get length(): number {\n    return this._lContainer.length - CONTAINER_HEADER_OFFSET;\n  }\n\n  override createEmbeddedView<C>(templateRef: TemplateRef<C>, context?: C, index?: number):\n      EmbeddedViewRef<C> {\n    const viewRef = templateRef.createEmbeddedView(context || <any>{});\n    this.insert(viewRef, index);\n    return viewRef;\n  }\n\n  override createComponent<C>(\n      componentFactory: ComponentFactory<C>, index?: number|undefined,\n      injector?: Injector|undefined, projectableNodes?: any[][]|undefined,\n      ngModuleRef?: NgModuleRef<any>|undefined): ComponentRef<C> {\n    const contextInjector = injector || this.parentInjector;\n    if (!ngModuleRef && (componentFactory as any).ngModule == null && contextInjector) {\n      // DO NOT REFACTOR. The code here used to have a `value || undefined` expression\n      // which seems to cause internal google apps to fail. This is documented in the\n      // following internal bug issue: go/b/142967802\n      const result = contextInjector.get(NgModuleRef, null);\n      if (result) {\n        ngModuleRef = result;\n      }\n    }\n\n    const componentRef =\n        componentFactory.create(contextInjector, projectableNodes, undefined, ngModuleRef);\n    this.insert(componentRef.hostView, index);\n    return componentRef;\n  }\n\n  override insert(viewRef: ViewRef, index?: number): ViewRef {\n    const lView = (viewRef as R3ViewRef<any>)._lView!;\n    const tView = lView[TVIEW];\n\n    if (ngDevMode && viewRef.destroyed) {\n      throw new Error('Cannot insert a destroyed View in a ViewContainer!');\n    }\n\n    if (viewAttachedToContainer(lView)) {\n      // If view is already attached, detach it first so we clean up references appropriately.\n\n      const prevIdx = this.indexOf(viewRef);\n\n      // A view might be attached either to this or a different container. The `prevIdx` for\n      // those cases will be:\n      // equal to -1 for views attached to this ViewContainerRef\n      // >= 0 for views attached to a different ViewContainerRef\n      if (prevIdx !== -1) {\n        this.detach(prevIdx);\n      } else {\n        const prevLContainer = lView[PARENT] as LContainer;\n        ngDevMode &&\n            assertEqual(\n                isLContainer(prevLContainer), true,\n                'An attached view should have its PARENT point to a container.');\n\n\n        // We need to re-create a R3ViewContainerRef instance since those are not stored on\n        // LView (nor anywhere else).\n        const prevVCRef = new R3ViewContainerRef(\n            prevLContainer, prevLContainer[T_HOST] as TDirectiveHostNode, prevLContainer[PARENT]);\n\n        prevVCRef.detach(prevVCRef.indexOf(viewRef));\n      }\n    }\n\n    // Logical operation of adding `LView` to `LContainer`\n    const adjustedIdx = this._adjustIndex(index);\n    const lContainer = this._lContainer;\n    insertView(tView, lView, lContainer, adjustedIdx);\n\n    // Physical operation of adding the DOM nodes.\n    const beforeNode = getBeforeNodeForView(adjustedIdx, lContainer);\n    const renderer = lView[RENDERER];\n    const parentRNode = nativeParentNode(renderer, lContainer[NATIVE] as RElement | RComment);\n    if (parentRNode !== null) {\n      addViewToContainer(tView, lContainer[T_HOST], renderer, lView, parentRNode, beforeNode);\n    }\n\n    (viewRef as R3ViewRef<any>).attachToViewContainerRef();\n    addToArray(getOrCreateViewRefs(lContainer), adjustedIdx, viewRef);\n\n    return viewRef;\n  }\n\n  override move(viewRef: ViewRef, newIndex: number): ViewRef {\n    if (ngDevMode && viewRef.destroyed) {\n      throw new Error('Cannot move a destroyed View in a ViewContainer!');\n    }\n    return this.insert(viewRef, newIndex);\n  }\n\n  override indexOf(viewRef: ViewRef): number {\n    const viewRefsArr = getViewRefs(this._lContainer);\n    return viewRefsArr !== null ? viewRefsArr.indexOf(viewRef) : -1;\n  }\n\n  override remove(index?: number): void {\n    const adjustedIdx = this._adjustIndex(index, -1);\n    const detachedView = detachView(this._lContainer, adjustedIdx);\n\n    if (detachedView) {\n      // Before destroying the view, remove it from the container's array of `ViewRef`s.\n      // This ensures the view container length is updated before calling\n      // `destroyLView`, which could recursively call view container methods that\n      // rely on an accurate container length.\n      // (e.g. a method on this view container being called by a child directive's OnDestroy\n      // lifecycle hook)\n      removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx);\n      destroyLView(detachedView[TVIEW], detachedView);\n    }\n  }\n\n  override detach(index?: number): ViewRef|null {\n    const adjustedIdx = this._adjustIndex(index, -1);\n    const view = detachView(this._lContainer, adjustedIdx);\n\n    const wasDetached =\n        view && removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx) != null;\n    return wasDetached ? new R3ViewRef(view!) : null;\n  }\n\n  private _adjustIndex(index?: number, shift: number = 0) {\n    if (index == null) {\n      return this.length + shift;\n    }\n    if (ngDevMode) {\n      assertGreaterThan(index, -1, `ViewRef index must be positive, got ${index}`);\n      // +1 because it's legal to insert at the end.\n      assertLessThan(index, this.length + 1 + shift, 'index');\n    }\n    return index;\n  }\n};\n\nfunction getViewRefs(lContainer: LContainer): ViewRef[]|null {\n  return lContainer[VIEW_REFS] as ViewRef[];\n}\n\nfunction getOrCreateViewRefs(lContainer: LContainer): ViewRef[] {\n  return (lContainer[VIEW_REFS] || (lContainer[VIEW_REFS] = [])) as ViewRef[];\n}\n\n/**\n * Creates a ViewContainerRef and stores it on the injector.\n *\n * @param ViewContainerRefToken The ViewContainerRef type\n * @param ElementRefToken The ElementRef type\n * @param hostTNode The node that is requesting a ViewContainerRef\n * @param hostLView The view to which the node belongs\n * @returns The ViewContainerRef instance to use\n */\nexport function createContainerRef(\n    hostTNode: TElementNode|TContainerNode|TElementContainerNode,\n    hostLView: LView): ViewContainerRef {\n  ngDevMode && assertTNodeType(hostTNode, TNodeType.AnyContainer | TNodeType.AnyRNode);\n\n  let lContainer: LContainer;\n  const slotValue = hostLView[hostTNode.index];\n  if (isLContainer(slotValue)) {\n    // If the host is a container, we don't need to create a new LContainer\n    lContainer = slotValue;\n  } else {\n    let commentNode: RComment;\n    // If the host is an element container, the native host element is guaranteed to be a\n    // comment and we can reuse that comment as anchor element for the new LContainer.\n    // The comment node in question is already part of the DOM structure so we don't need to append\n    // it again.\n    if (hostTNode.type & TNodeType.ElementContainer) {\n      commentNode = unwrapRNode(slotValue) as RComment;\n    } else {\n      // If the host is a regular element, we have to insert a comment node manually which will\n      // be used as an anchor when inserting elements. In this specific case we use low-level DOM\n      // manipulation to insert it.\n      const renderer = hostLView[RENDERER];\n      ngDevMode && ngDevMode.rendererCreateComment++;\n      commentNode = renderer.createComment(ngDevMode ? 'container' : '');\n\n      const hostNative = getNativeByTNode(hostTNode, hostLView)!;\n      const parentOfHostNative = nativeParentNode(renderer, hostNative);\n      nativeInsertBefore(\n          renderer, parentOfHostNative!, commentNode, nativeNextSibling(renderer, hostNative),\n          false);\n    }\n\n    hostLView[hostTNode.index] = lContainer =\n        createLContainer(slotValue, hostLView, commentNode, hostTNode);\n\n    addToViewTree(hostLView, lContainer);\n  }\n\n  return new R3ViewContainerRef(lContainer, hostTNode, hostLView);\n}\n"]}
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