/** * @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 { assertNodeInjector } from '../render3/assert'; import { getParentInjectorLocation, NodeInjector } from '../render3/di'; import { addToViewTree, createLContainer } from '../render3/instructions/shared'; import { CONTAINER_HEADER_OFFSET, NATIVE, VIEW_REFS } from '../render3/interfaces/container'; import { isLContainer } from '../render3/interfaces/type_checks'; import { PARENT, RENDERER, T_HOST, TVIEW } from '../render3/interfaces/view'; import { assertTNodeType } from '../render3/node_assert'; import { addViewToContainer, destroyLView, detachView, getBeforeNodeForView, insertView, nativeInsertBefore, nativeNextSibling, nativeParentNode } from '../render3/node_manipulation'; import { getCurrentTNode, getLView } from '../render3/state'; import { getParentInjectorIndex, getParentInjectorView, hasParentInjector } from '../render3/util/injector_utils'; import { getNativeByTNode, unwrapRNode, viewAttachedToContainer } from '../render3/util/view_utils'; import { ViewRef as R3ViewRef } from '../render3/view_ref'; import { addToArray, removeFromArray } from '../util/array_utils'; import { assertEqual, assertGreaterThan, assertLessThan } from '../util/assert'; import { noop } from '../util/noop'; import { createElementRef } from './element_ref'; import { NgModuleRef } from './ng_module_factory'; export const SWITCH_VIEW_CONTAINER_REF_FACTORY__POST_R3__ = injectViewContainerRef; const SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__ = noop; const SWITCH_VIEW_CONTAINER_REF_FACTORY = SWITCH_VIEW_CONTAINER_REF_FACTORY__PRE_R3__; /** * Represents a container where one or more views can be attached to a component. * * Can contain *host views* (created by instantiating a * component with the `createComponent()` method), and *embedded views* * (created by instantiating a `TemplateRef` with the `createEmbeddedView()` method). * * A view container instance can contain other view containers, * creating a [view hierarchy](guide/glossary#view-tree). * * @see `ComponentRef` * @see `EmbeddedViewRef` * * @publicApi */ export class ViewContainerRef { } /** * @internal * @nocollapse */ ViewContainerRef.__NG_ELEMENT_ID__ = SWITCH_VIEW_CONTAINER_REF_FACTORY; /** * Creates a ViewContainerRef and stores it on the injector. Or, if the ViewContainerRef * already exists, retrieves the existing ViewContainerRef. * * @returns The ViewContainerRef instance to use */ export function injectViewContainerRef() { const previousTNode = getCurrentTNode(); return createContainerRef(previousTNode, getLView()); } const VE_ViewContainerRef = ViewContainerRef; const R3ViewContainerRef = class ViewContainerRef extends VE_ViewContainerRef { constructor(_lContainer, _hostTNode, _hostLView) { super(); this._lContainer = _lContainer; this._hostTNode = _hostTNode; this._hostLView = _hostLView; } get element() { return createElementRef(this._hostTNode, this._hostLView); } get injector() { return new NodeInjector(this._hostTNode, this._hostLView); } /** @deprecated No replacement */ get parentInjector() { const parentLocation = getParentInjectorLocation(this._hostTNode, this._hostLView); if (hasParentInjector(parentLocation)) { const parentView = getParentInjectorView(parentLocation, this._hostLView); const injectorIndex = getParentInjectorIndex(parentLocation); ngDevMode && assertNodeInjector(parentView, injectorIndex); const parentTNode = parentView[TVIEW].data[injectorIndex + 8 /* TNODE */]; return new NodeInjector(parentTNode, parentView); } else { return new NodeInjector(null, this._hostLView); } } clear() { while (this.length > 0) { this.remove(this.length - 1); } } get(index) { const viewRefs = getViewRefs(this._lContainer); return viewRefs !== null && viewRefs[index] || null; } get length() { return this._lContainer.length - CONTAINER_HEADER_OFFSET; } createEmbeddedView(templateRef, context, index) { const viewRef = templateRef.createEmbeddedView(context || {}); this.insert(viewRef, index); return viewRef; } createComponent(componentFactory, index, injector, projectableNodes, ngModuleRef) { const contextInjector = injector || this.parentInjector; if (!ngModuleRef && componentFactory.ngModule == null && contextInjector) { // DO NOT REFACTOR. The code here used to have a `value || undefined` expression // which seems to cause internal google apps to fail. This is documented in the // following internal bug issue: go/b/142967802 const result = contextInjector.get(NgModuleRef, null); if (result) { ngModuleRef = result; } } const componentRef = componentFactory.create(contextInjector, projectableNodes, undefined, ngModuleRef); this.insert(componentRef.hostView, index); return componentRef; } insert(viewRef, index) { const lView = viewRef._lView; const tView = lView[TVIEW]; if (ngDevMode && viewRef.destroyed) { throw new Error('Cannot insert a destroyed View in a ViewContainer!'); } if (viewAttachedToContainer(lView)) { // If view is already attached, detach it first so we clean up references appropriately. const prevIdx = this.indexOf(viewRef); // A view might be attached either to this or a different container. The `prevIdx` for // those cases will be: // equal to -1 for views attached to this ViewContainerRef // >= 0 for views attached to a different ViewContainerRef if (prevIdx !== -1) { this.detach(prevIdx); } else { const prevLContainer = lView[PARENT]; ngDevMode && assertEqual(isLContainer(prevLContainer), true, 'An attached view should have its PARENT point to a container.'); // We need to re-create a R3ViewContainerRef instance since those are not stored on // LView (nor anywhere else). const prevVCRef = new R3ViewContainerRef(prevLContainer, prevLContainer[T_HOST], prevLContainer[PARENT]); prevVCRef.detach(prevVCRef.indexOf(viewRef)); } } // Logical operation of adding `LView` to `LContainer` const adjustedIdx = this._adjustIndex(index); const lContainer = this._lContainer; insertView(tView, lView, lContainer, adjustedIdx); // Physical operation of adding the DOM nodes. const beforeNode = getBeforeNodeForView(adjustedIdx, lContainer); const renderer = lView[RENDERER]; const parentRNode = nativeParentNode(renderer, lContainer[NATIVE]); if (parentRNode !== null) { addViewToContainer(tView, lContainer[T_HOST], renderer, lView, parentRNode, beforeNode); } viewRef.attachToViewContainerRef(); addToArray(getOrCreateViewRefs(lContainer), adjustedIdx, viewRef); return viewRef; } move(viewRef, newIndex) { if (ngDevMode && viewRef.destroyed) { throw new Error('Cannot move a destroyed View in a ViewContainer!'); } return this.insert(viewRef, newIndex); } indexOf(viewRef) { const viewRefsArr = getViewRefs(this._lContainer); return viewRefsArr !== null ? viewRefsArr.indexOf(viewRef) : -1; } remove(index) { const adjustedIdx = this._adjustIndex(index, -1); const detachedView = detachView(this._lContainer, adjustedIdx); if (detachedView) { // Before destroying the view, remove it from the container's array of `ViewRef`s. // This ensures the view container length is updated before calling // `destroyLView`, which could recursively call view container methods that // rely on an accurate container length. // (e.g. a method on this view container being called by a child directive's OnDestroy // lifecycle hook) removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx); destroyLView(detachedView[TVIEW], detachedView); } } detach(index) { const adjustedIdx = this._adjustIndex(index, -1); const view = detachView(this._lContainer, adjustedIdx); const wasDetached = view && removeFromArray(getOrCreateViewRefs(this._lContainer), adjustedIdx) != null; return wasDetached ? new R3ViewRef(view) : null; } _adjustIndex(index, shift = 0) { if (index == null) { return this.length + shift; } if (ngDevMode) { assertGreaterThan(index, -1, `ViewRef index must be positive, got ${index}`); // +1 because it's legal to insert at the end. assertLessThan(index, this.length + 1 + shift, 'index'); } return index; } }; function getViewRefs(lContainer) { return lContainer[VIEW_REFS]; } function getOrCreateViewRefs(lContainer) { return (lContainer[VIEW_REFS] || (lContainer[VIEW_REFS] = [])); } /** * Creates a ViewContainerRef and stores it on the injector. * * @param ViewContainerRefToken The ViewContainerRef type * @param ElementRefToken The ElementRef type * @param hostTNode The node that is requesting a ViewContainerRef * @param hostLView The view to which the node belongs * @returns The ViewContainerRef instance to use */ export function createContainerRef(hostTNode, hostLView) { ngDevMode && assertTNodeType(hostTNode, 12 /* AnyContainer */ | 3 /* AnyRNode */); let lContainer; const slotValue = hostLView[hostTNode.index]; if (isLContainer(slotValue)) { // If the host is a container, we don't need to create a new LContainer lContainer = slotValue; } else { let commentNode; // If the host is an element container, the native host element is guaranteed to be a // comment and we can reuse that comment as anchor element for the new LContainer. // The comment node in question is already part of the DOM structure so we don't need to append // it again. if (hostTNode.type & 8 /* ElementContainer */) { commentNode = unwrapRNode(slotValue); } else { // If the host is a regular element, we have to insert a comment node manually which will // be used as an anchor when inserting elements. In this specific case we use low-level DOM // manipulation to insert it. const renderer = hostLView[RENDERER]; ngDevMode && ngDevMode.rendererCreateComment++; commentNode = renderer.createComment(ngDevMode ? 'container' : ''); const hostNative = getNativeByTNode(hostTNode, hostLView); const parentOfHostNative = nativeParentNode(renderer, hostNative); nativeInsertBefore(renderer, parentOfHostNative, commentNode, nativeNextSibling(renderer, hostNative), false); } hostLView[hostTNode.index] = lContainer = createLContainer(slotValue, hostLView, commentNode, hostTNode); addToViewTree(hostLView, lContainer); } return new R3ViewContainerRef(lContainer, hostTNode, hostLView); } //# 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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"]}