/**
 * @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 { assertLContainer } from '../render3/assert';
import { createLView, renderView } from '../render3/instructions/shared';
import { DECLARATION_LCONTAINER, QUERIES } from '../render3/interfaces/view';
import { getCurrentTNode, getLView } from '../render3/state';
import { ViewRef as R3_ViewRef } from '../render3/view_ref';
import { assertDefined } from '../util/assert';
import { createElementRef } from './element_ref';
/**
 * Represents an embedded template that can be used to instantiate embedded views.
 * To instantiate embedded views based on a template, use the `ViewContainerRef`
 * method `createEmbeddedView()`.
 *
 * Access a `TemplateRef` instance by placing a directive on an `<ng-template>`
 * element (or directive prefixed with `*`). The `TemplateRef` for the embedded view
 * is injected into the constructor of the directive,
 * using the `TemplateRef` token.
 *
 * You can also use a `Query` to find a `TemplateRef` associated with
 * a component or a directive.
 *
 * @see `ViewContainerRef`
 * @see [Navigate the Component Tree with DI](guide/dependency-injection-navtree)
 *
 * @publicApi
 */
export class TemplateRef {
}
/**
 * @internal
 * @nocollapse
 */
TemplateRef.__NG_ELEMENT_ID__ = injectTemplateRef;
const ViewEngineTemplateRef = TemplateRef;
// TODO(alxhub): combine interface and implementation. Currently this is challenging since something
// in g3 depends on them being separate.
const R3TemplateRef = class TemplateRef extends ViewEngineTemplateRef {
    constructor(_declarationLView, _declarationTContainer, elementRef) {
        super();
        this._declarationLView = _declarationLView;
        this._declarationTContainer = _declarationTContainer;
        this.elementRef = elementRef;
    }
    createEmbeddedView(context, injector) {
        const embeddedTView = this._declarationTContainer.tViews;
        const embeddedLView = createLView(this._declarationLView, embeddedTView, context, 16 /* LViewFlags.CheckAlways */, null, embeddedTView.declTNode, null, null, null, null, injector || null);
        const declarationLContainer = this._declarationLView[this._declarationTContainer.index];
        ngDevMode && assertLContainer(declarationLContainer);
        embeddedLView[DECLARATION_LCONTAINER] = declarationLContainer;
        const declarationViewLQueries = this._declarationLView[QUERIES];
        if (declarationViewLQueries !== null) {
            embeddedLView[QUERIES] = declarationViewLQueries.createEmbeddedView(embeddedTView);
        }
        renderView(embeddedTView, embeddedLView, context);
        return new R3_ViewRef(embeddedLView);
    }
};
/**
 * Creates a TemplateRef given a node.
 *
 * @returns The TemplateRef instance to use
 */
export function injectTemplateRef() {
    return createTemplateRef(getCurrentTNode(), getLView());
}
/**
 * Creates a TemplateRef and stores it on the injector.
 *
 * @param hostTNode The node on which a TemplateRef is requested
 * @param hostLView The `LView` to which the node belongs
 * @returns The TemplateRef instance or null if we can't create a TemplateRef on a given node type
 */
export function createTemplateRef(hostTNode, hostLView) {
    if (hostTNode.type & 4 /* TNodeType.Container */) {
        ngDevMode && assertDefined(hostTNode.tViews, 'TView must be allocated');
        return new R3TemplateRef(hostLView, hostTNode, createElementRef(hostTNode, hostLView));
    }
    return null;
}
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The `TemplateRef` for the embedded view\n * is injected into the constructor of the directive,\n * using the `TemplateRef` token.\n *\n * You can also use a `Query` to find a `TemplateRef` associated with\n * a component or a directive.\n *\n * @see `ViewContainerRef`\n * @see [Navigate the Component Tree with DI](guide/dependency-injection-navtree)\n *\n * @publicApi\n */\nexport abstract class TemplateRef<C> {\n  /**\n   * The anchor element in the parent view for this embedded view.\n   *\n   * The data-binding and injection contexts of embedded views created from this `TemplateRef`\n   * inherit from the contexts of this location.\n   *\n   * Typically new embedded views are attached to the view container of this location, but in\n   * advanced use-cases, the view can be attached to a different container while keeping the\n   * data-binding and injection context from the original location.\n   *\n   */\n  // TODO(i): rename to anchor or location\n  abstract readonly elementRef: ElementRef;\n\n  /**\n   * Instantiates an unattached embedded view based on this template.\n   * @param context The data-binding context of the embedded view, as declared\n   * in the `<ng-template>` usage.\n   * @param injector Injector to be used within the embedded view.\n   * @returns The new embedded view object.\n   */\n  abstract createEmbeddedView(context: C, injector?: Injector): EmbeddedViewRef<C>;\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__: () => TemplateRef<any>| null = injectTemplateRef;\n}\n\nconst ViewEngineTemplateRef = TemplateRef;\n\n// TODO(alxhub): combine interface and implementation. Currently this is challenging since something\n// in g3 depends on them being separate.\nconst R3TemplateRef = class TemplateRef<T> extends ViewEngineTemplateRef<T> {\n  constructor(\n      private _declarationLView: LView, private _declarationTContainer: TContainerNode,\n      public override elementRef: ElementRef) {\n    super();\n  }\n\n  override createEmbeddedView(context: T, injector?: Injector): EmbeddedViewRef<T> {\n    const embeddedTView = this._declarationTContainer.tViews as TView;\n    const embeddedLView = createLView(\n        this._declarationLView, embeddedTView, context, LViewFlags.CheckAlways, null,\n        embeddedTView.declTNode, null, null, null, null, injector || null);\n\n    const declarationLContainer = this._declarationLView[this._declarationTContainer.index];\n    ngDevMode && assertLContainer(declarationLContainer);\n    embeddedLView[DECLARATION_LCONTAINER] = declarationLContainer;\n\n    const declarationViewLQueries = this._declarationLView[QUERIES];\n    if (declarationViewLQueries !== null) {\n      embeddedLView[QUERIES] = declarationViewLQueries.createEmbeddedView(embeddedTView);\n    }\n\n    renderView(embeddedTView, embeddedLView, context);\n\n    return new R3_ViewRef<T>(embeddedLView);\n  }\n};\n\n/**\n * Creates a TemplateRef given a node.\n *\n * @returns The TemplateRef instance to use\n */\nexport function injectTemplateRef<T>(): TemplateRef<T>|null {\n  return createTemplateRef<T>(getCurrentTNode()!, getLView());\n}\n\n/**\n * Creates a TemplateRef and stores it on the injector.\n *\n * @param hostTNode The node on which a TemplateRef is requested\n * @param hostLView The `LView` to which the node belongs\n * @returns The TemplateRef instance or null if we can't create a TemplateRef on a given node type\n */\nexport function createTemplateRef<T>(hostTNode: TNode, hostLView: LView): TemplateRef<T>|null {\n  if (hostTNode.type & TNodeType.Container) {\n    ngDevMode && assertDefined(hostTNode.tViews, 'TView must be allocated');\n    return new R3TemplateRef(\n        hostLView, hostTNode as TContainerNode, createElementRef(hostTNode, hostLView));\n  }\n  return null;\n}\n"]}