/**
 * @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 { createElementRef, ElementRef as ViewEngine_ElementRef, unwrapElementRef } from '../linker/element_ref';
import { QueryList } from '../linker/query_list';
import { createTemplateRef, TemplateRef as ViewEngine_TemplateRef } from '../linker/template_ref';
import { createContainerRef, ViewContainerRef } from '../linker/view_container_ref';
import { assertDefined, assertIndexInRange, assertNumber, throwError } from '../util/assert';
import { stringify } from '../util/stringify';
import { assertFirstCreatePass, assertLContainer } from './assert';
import { getNodeInjectable, locateDirectiveOrProvider } from './di';
import { storeCleanupWithContext } from './instructions/shared';
import { CONTAINER_HEADER_OFFSET, MOVED_VIEWS } from './interfaces/container';
import { DECLARATION_LCONTAINER, PARENT, QUERIES, TVIEW } from './interfaces/view';
import { assertTNodeType } from './node_assert';
import { getCurrentQueryIndex, getCurrentTNode, getLView, getTView, setCurrentQueryIndex } from './state';
import { isCreationMode } from './util/view_utils';
class LQuery_ {
    constructor(queryList) {
        this.queryList = queryList;
        this.matches = null;
    }
    clone() {
        return new LQuery_(this.queryList);
    }
    setDirty() {
        this.queryList.setDirty();
    }
}
class LQueries_ {
    constructor(queries = []) {
        this.queries = queries;
    }
    createEmbeddedView(tView) {
        const tQueries = tView.queries;
        if (tQueries !== null) {
            const noOfInheritedQueries = tView.contentQueries !== null ? tView.contentQueries[0] : tQueries.length;
            const viewLQueries = [];
            // An embedded view has queries propagated from a declaration view at the beginning of the
            // TQueries collection and up until a first content query declared in the embedded view. Only
            // propagated LQueries are created at this point (LQuery corresponding to declared content
            // queries will be instantiated from the content query instructions for each directive).
            for (let i = 0; i < noOfInheritedQueries; i++) {
                const tQuery = tQueries.getByIndex(i);
                const parentLQuery = this.queries[tQuery.indexInDeclarationView];
                viewLQueries.push(parentLQuery.clone());
            }
            return new LQueries_(viewLQueries);
        }
        return null;
    }
    insertView(tView) {
        this.dirtyQueriesWithMatches(tView);
    }
    detachView(tView) {
        this.dirtyQueriesWithMatches(tView);
    }
    dirtyQueriesWithMatches(tView) {
        for (let i = 0; i < this.queries.length; i++) {
            if (getTQuery(tView, i).matches !== null) {
                this.queries[i].setDirty();
            }
        }
    }
}
class TQueryMetadata_ {
    constructor(predicate, flags, read = null) {
        this.predicate = predicate;
        this.flags = flags;
        this.read = read;
    }
}
class TQueries_ {
    constructor(queries = []) {
        this.queries = queries;
    }
    elementStart(tView, tNode) {
        ngDevMode &&
            assertFirstCreatePass(tView, 'Queries should collect results on the first template pass only');
        for (let i = 0; i < this.queries.length; i++) {
            this.queries[i].elementStart(tView, tNode);
        }
    }
    elementEnd(tNode) {
        for (let i = 0; i < this.queries.length; i++) {
            this.queries[i].elementEnd(tNode);
        }
    }
    embeddedTView(tNode) {
        let queriesForTemplateRef = null;
        for (let i = 0; i < this.length; i++) {
            const childQueryIndex = queriesForTemplateRef !== null ? queriesForTemplateRef.length : 0;
            const tqueryClone = this.getByIndex(i).embeddedTView(tNode, childQueryIndex);
            if (tqueryClone) {
                tqueryClone.indexInDeclarationView = i;
                if (queriesForTemplateRef !== null) {
                    queriesForTemplateRef.push(tqueryClone);
                }
                else {
                    queriesForTemplateRef = [tqueryClone];
                }
            }
        }
        return queriesForTemplateRef !== null ? new TQueries_(queriesForTemplateRef) : null;
    }
    template(tView, tNode) {
        ngDevMode &&
            assertFirstCreatePass(tView, 'Queries should collect results on the first template pass only');
        for (let i = 0; i < this.queries.length; i++) {
            this.queries[i].template(tView, tNode);
        }
    }
    getByIndex(index) {
        ngDevMode && assertIndexInRange(this.queries, index);
        return this.queries[index];
    }
    get length() {
        return this.queries.length;
    }
    track(tquery) {
        this.queries.push(tquery);
    }
}
class TQuery_ {
    constructor(metadata, nodeIndex = -1) {
        this.metadata = metadata;
        this.matches = null;
        this.indexInDeclarationView = -1;
        this.crossesNgTemplate = false;
        /**
         * A flag indicating if a given query still applies to nodes it is crossing. We use this flag
         * (alongside with _declarationNodeIndex) to know when to stop applying content queries to
         * elements in a template.
         */
        this._appliesToNextNode = true;
        this._declarationNodeIndex = nodeIndex;
    }
    elementStart(tView, tNode) {
        if (this.isApplyingToNode(tNode)) {
            this.matchTNode(tView, tNode);
        }
    }
    elementEnd(tNode) {
        if (this._declarationNodeIndex === tNode.index) {
            this._appliesToNextNode = false;
        }
    }
    template(tView, tNode) {
        this.elementStart(tView, tNode);
    }
    embeddedTView(tNode, childQueryIndex) {
        if (this.isApplyingToNode(tNode)) {
            this.crossesNgTemplate = true;
            // A marker indicating a `<ng-template>` element (a placeholder for query results from
            // embedded views created based on this `<ng-template>`).
            this.addMatch(-tNode.index, childQueryIndex);
            return new TQuery_(this.metadata);
        }
        return null;
    }
    isApplyingToNode(tNode) {
        if (this._appliesToNextNode &&
            (this.metadata.flags & 1 /* QueryFlags.descendants */) !== 1 /* QueryFlags.descendants */) {
            const declarationNodeIdx = this._declarationNodeIndex;
            let parent = tNode.parent;
            // Determine if a given TNode is a "direct" child of a node on which a content query was
            // declared (only direct children of query's host node can match with the descendants: false
            // option). There are 3 main use-case / conditions to consider here:
            // - <needs-target><i #target></i></needs-target>: here <i #target> parent node is a query
            // host node;
            // - <needs-target><ng-template [ngIf]="true"><i #target></i></ng-template></needs-target>:
            // here <i #target> parent node is null;
            // - <needs-target><ng-container><i #target></i></ng-container></needs-target>: here we need
            // to go past `<ng-container>` to determine <i #target> parent node (but we shouldn't traverse
            // up past the query's host node!).
            while (parent !== null && (parent.type & 8 /* TNodeType.ElementContainer */) &&
                parent.index !== declarationNodeIdx) {
                parent = parent.parent;
            }
            return declarationNodeIdx === (parent !== null ? parent.index : -1);
        }
        return this._appliesToNextNode;
    }
    matchTNode(tView, tNode) {
        const predicate = this.metadata.predicate;
        if (Array.isArray(predicate)) {
            for (let i = 0; i < predicate.length; i++) {
                const name = predicate[i];
                this.matchTNodeWithReadOption(tView, tNode, getIdxOfMatchingSelector(tNode, name));
                // Also try matching the name to a provider since strings can be used as DI tokens too.
                this.matchTNodeWithReadOption(tView, tNode, locateDirectiveOrProvider(tNode, tView, name, false, false));
            }
        }
        else {
            if (predicate === ViewEngine_TemplateRef) {
                if (tNode.type & 4 /* TNodeType.Container */) {
                    this.matchTNodeWithReadOption(tView, tNode, -1);
                }
            }
            else {
                this.matchTNodeWithReadOption(tView, tNode, locateDirectiveOrProvider(tNode, tView, predicate, false, false));
            }
        }
    }
    matchTNodeWithReadOption(tView, tNode, nodeMatchIdx) {
        if (nodeMatchIdx !== null) {
            const read = this.metadata.read;
            if (read !== null) {
                if (read === ViewEngine_ElementRef || read === ViewContainerRef ||
                    read === ViewEngine_TemplateRef && (tNode.type & 4 /* TNodeType.Container */)) {
                    this.addMatch(tNode.index, -2);
                }
                else {
                    const directiveOrProviderIdx = locateDirectiveOrProvider(tNode, tView, read, false, false);
                    if (directiveOrProviderIdx !== null) {
                        this.addMatch(tNode.index, directiveOrProviderIdx);
                    }
                }
            }
            else {
                this.addMatch(tNode.index, nodeMatchIdx);
            }
        }
    }
    addMatch(tNodeIdx, matchIdx) {
        if (this.matches === null) {
            this.matches = [tNodeIdx, matchIdx];
        }
        else {
            this.matches.push(tNodeIdx, matchIdx);
        }
    }
}
/**
 * Iterates over local names for a given node and returns directive index
 * (or -1 if a local name points to an element).
 *
 * @param tNode static data of a node to check
 * @param selector selector to match
 * @returns directive index, -1 or null if a selector didn't match any of the local names
 */
function getIdxOfMatchingSelector(tNode, selector) {
    const localNames = tNode.localNames;
    if (localNames !== null) {
        for (let i = 0; i < localNames.length; i += 2) {
            if (localNames[i] === selector) {
                return localNames[i + 1];
            }
        }
    }
    return null;
}
function createResultByTNodeType(tNode, currentView) {
    if (tNode.type & (3 /* TNodeType.AnyRNode */ | 8 /* TNodeType.ElementContainer */)) {
        return createElementRef(tNode, currentView);
    }
    else if (tNode.type & 4 /* TNodeType.Container */) {
        return createTemplateRef(tNode, currentView);
    }
    return null;
}
function createResultForNode(lView, tNode, matchingIdx, read) {
    if (matchingIdx === -1) {
        // if read token and / or strategy is not specified, detect it using appropriate tNode type
        return createResultByTNodeType(tNode, lView);
    }
    else if (matchingIdx === -2) {
        // read a special token from a node injector
        return createSpecialToken(lView, tNode, read);
    }
    else {
        // read a token
        return getNodeInjectable(lView, lView[TVIEW], matchingIdx, tNode);
    }
}
function createSpecialToken(lView, tNode, read) {
    if (read === ViewEngine_ElementRef) {
        return createElementRef(tNode, lView);
    }
    else if (read === ViewEngine_TemplateRef) {
        return createTemplateRef(tNode, lView);
    }
    else if (read === ViewContainerRef) {
        ngDevMode && assertTNodeType(tNode, 3 /* TNodeType.AnyRNode */ | 12 /* TNodeType.AnyContainer */);
        return createContainerRef(tNode, lView);
    }
    else {
        ngDevMode &&
            throwError(`Special token to read should be one of ElementRef, TemplateRef or ViewContainerRef but got ${stringify(read)}.`);
    }
}
/**
 * A helper function that creates query results for a given view. This function is meant to do the
 * processing once and only once for a given view instance (a set of results for a given view
 * doesn't change).
 */
function materializeViewResults(tView, lView, tQuery, queryIndex) {
    const lQuery = lView[QUERIES].queries[queryIndex];
    if (lQuery.matches === null) {
        const tViewData = tView.data;
        const tQueryMatches = tQuery.matches;
        const result = [];
        for (let i = 0; i < tQueryMatches.length; i += 2) {
            const matchedNodeIdx = tQueryMatches[i];
            if (matchedNodeIdx < 0) {
                // we at the <ng-template> marker which might have results in views created based on this
                // <ng-template> - those results will be in separate views though, so here we just leave
                // null as a placeholder
                result.push(null);
            }
            else {
                ngDevMode && assertIndexInRange(tViewData, matchedNodeIdx);
                const tNode = tViewData[matchedNodeIdx];
                result.push(createResultForNode(lView, tNode, tQueryMatches[i + 1], tQuery.metadata.read));
            }
        }
        lQuery.matches = result;
    }
    return lQuery.matches;
}
/**
 * A helper function that collects (already materialized) query results from a tree of views,
 * starting with a provided LView.
 */
function collectQueryResults(tView, lView, queryIndex, result) {
    const tQuery = tView.queries.getByIndex(queryIndex);
    const tQueryMatches = tQuery.matches;
    if (tQueryMatches !== null) {
        const lViewResults = materializeViewResults(tView, lView, tQuery, queryIndex);
        for (let i = 0; i < tQueryMatches.length; i += 2) {
            const tNodeIdx = tQueryMatches[i];
            if (tNodeIdx > 0) {
                result.push(lViewResults[i / 2]);
            }
            else {
                const childQueryIndex = tQueryMatches[i + 1];
                const declarationLContainer = lView[-tNodeIdx];
                ngDevMode && assertLContainer(declarationLContainer);
                // collect matches for views inserted in this container
                for (let i = CONTAINER_HEADER_OFFSET; i < declarationLContainer.length; i++) {
                    const embeddedLView = declarationLContainer[i];
                    if (embeddedLView[DECLARATION_LCONTAINER] === embeddedLView[PARENT]) {
                        collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);
                    }
                }
                // collect matches for views created from this declaration container and inserted into
                // different containers
                if (declarationLContainer[MOVED_VIEWS] !== null) {
                    const embeddedLViews = declarationLContainer[MOVED_VIEWS];
                    for (let i = 0; i < embeddedLViews.length; i++) {
                        const embeddedLView = embeddedLViews[i];
                        collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);
                    }
                }
            }
        }
    }
    return result;
}
/**
 * Refreshes a query by combining matches from all active views and removing matches from deleted
 * views.
 *
 * @returns `true` if a query got dirty during change detection or if this is a static query
 * resolving in creation mode, `false` otherwise.
 *
 * @codeGenApi
 */
export function ɵɵqueryRefresh(queryList) {
    const lView = getLView();
    const tView = getTView();
    const queryIndex = getCurrentQueryIndex();
    setCurrentQueryIndex(queryIndex + 1);
    const tQuery = getTQuery(tView, queryIndex);
    if (queryList.dirty &&
        (isCreationMode(lView) ===
            ((tQuery.metadata.flags & 2 /* QueryFlags.isStatic */) === 2 /* QueryFlags.isStatic */))) {
        if (tQuery.matches === null) {
            queryList.reset([]);
        }
        else {
            const result = tQuery.crossesNgTemplate ?
                collectQueryResults(tView, lView, queryIndex, []) :
                materializeViewResults(tView, lView, tQuery, queryIndex);
            queryList.reset(result, unwrapElementRef);
            queryList.notifyOnChanges();
        }
        return true;
    }
    return false;
}
/**
 * Creates new QueryList, stores the reference in LView and returns QueryList.
 *
 * @param predicate The type for which the query will search
 * @param flags Flags associated with the query
 * @param read What to save in the query
 *
 * @codeGenApi
 */
export function ɵɵviewQuery(predicate, flags, read) {
    ngDevMode && assertNumber(flags, 'Expecting flags');
    const tView = getTView();
    if (tView.firstCreatePass) {
        createTQuery(tView, new TQueryMetadata_(predicate, flags, read), -1);
        if ((flags & 2 /* QueryFlags.isStatic */) === 2 /* QueryFlags.isStatic */) {
            tView.staticViewQueries = true;
        }
    }
    createLQuery(tView, getLView(), flags);
}
/**
 * Registers a QueryList, associated with a content query, for later refresh (part of a view
 * refresh).
 *
 * @param directiveIndex Current directive index
 * @param predicate The type for which the query will search
 * @param flags Flags associated with the query
 * @param read What to save in the query
 * @returns QueryList<T>
 *
 * @codeGenApi
 */
export function ɵɵcontentQuery(directiveIndex, predicate, flags, read) {
    ngDevMode && assertNumber(flags, 'Expecting flags');
    const tView = getTView();
    if (tView.firstCreatePass) {
        const tNode = getCurrentTNode();
        createTQuery(tView, new TQueryMetadata_(predicate, flags, read), tNode.index);
        saveContentQueryAndDirectiveIndex(tView, directiveIndex);
        if ((flags & 2 /* QueryFlags.isStatic */) === 2 /* QueryFlags.isStatic */) {
            tView.staticContentQueries = true;
        }
    }
    createLQuery(tView, getLView(), flags);
}
/**
 * Loads a QueryList corresponding to the current view or content query.
 *
 * @codeGenApi
 */
export function ɵɵloadQuery() {
    return loadQueryInternal(getLView(), getCurrentQueryIndex());
}
function loadQueryInternal(lView, queryIndex) {
    ngDevMode &&
        assertDefined(lView[QUERIES], 'LQueries should be defined when trying to load a query');
    ngDevMode && assertIndexInRange(lView[QUERIES].queries, queryIndex);
    return lView[QUERIES].queries[queryIndex].queryList;
}
function createLQuery(tView, lView, flags) {
    const queryList = new QueryList((flags & 4 /* QueryFlags.emitDistinctChangesOnly */) === 4 /* QueryFlags.emitDistinctChangesOnly */);
    storeCleanupWithContext(tView, lView, queryList, queryList.destroy);
    if (lView[QUERIES] === null)
        lView[QUERIES] = new LQueries_();
    lView[QUERIES].queries.push(new LQuery_(queryList));
}
function createTQuery(tView, metadata, nodeIndex) {
    if (tView.queries === null)
        tView.queries = new TQueries_();
    tView.queries.track(new TQuery_(metadata, nodeIndex));
}
function saveContentQueryAndDirectiveIndex(tView, directiveIndex) {
    const tViewContentQueries = tView.contentQueries || (tView.contentQueries = []);
    const lastSavedDirectiveIndex = tViewContentQueries.length ? tViewContentQueries[tViewContentQueries.length - 1] : -1;
    if (directiveIndex !== lastSavedDirectiveIndex) {
        tViewContentQueries.push(tView.queries.length - 1, directiveIndex);
    }
}
function getTQuery(tView, index) {
    ngDevMode && assertDefined(tView.queries, 'TQueries must be defined to retrieve a TQuery');
    return tView.queries.getByIndex(index);
}
//# 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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\n// We are temporarily importing the existing viewEngine_from core so we can be sure we are\n// correctly implementing its interfaces for backwards compatibility.\n\nimport {ProviderToken} from '../di/provider_token';\nimport {createElementRef, ElementRef as ViewEngine_ElementRef, unwrapElementRef} from '../linker/element_ref';\nimport {QueryList} from '../linker/query_list';\nimport {createTemplateRef, TemplateRef as ViewEngine_TemplateRef} from '../linker/template_ref';\nimport {createContainerRef, ViewContainerRef} from '../linker/view_container_ref';\nimport {assertDefined, assertIndexInRange, assertNumber, throwError} from '../util/assert';\nimport {stringify} from '../util/stringify';\n\nimport {assertFirstCreatePass, assertLContainer} from './assert';\nimport {getNodeInjectable, locateDirectiveOrProvider} from './di';\nimport {storeCleanupWithContext} from './instructions/shared';\nimport {CONTAINER_HEADER_OFFSET, LContainer, MOVED_VIEWS} from './interfaces/container';\nimport {TContainerNode, TElementContainerNode, TElementNode, TNode, TNodeType} from './interfaces/node';\nimport {LQueries, LQuery, QueryFlags, TQueries, TQuery, TQueryMetadata} from './interfaces/query';\nimport {DECLARATION_LCONTAINER, LView, PARENT, QUERIES, TVIEW, TView} from './interfaces/view';\nimport {assertTNodeType} from './node_assert';\nimport {getCurrentQueryIndex, getCurrentTNode, getLView, getTView, setCurrentQueryIndex} from './state';\nimport {isCreationMode} from './util/view_utils';\n\nclass LQuery_<T> implements LQuery<T> {\n  matches: (T|null)[]|null = null;\n  constructor(public queryList: QueryList<T>) {}\n  clone(): LQuery<T> {\n    return new LQuery_(this.queryList);\n  }\n  setDirty(): void {\n    this.queryList.setDirty();\n  }\n}\n\nclass LQueries_ implements LQueries {\n  constructor(public queries: LQuery<any>[] = []) {}\n\n  createEmbeddedView(tView: TView): LQueries|null {\n    const tQueries = tView.queries;\n    if (tQueries !== null) {\n      const noOfInheritedQueries =\n          tView.contentQueries !== null ? tView.contentQueries[0] : tQueries.length;\n      const viewLQueries: LQuery<any>[] = [];\n\n      // An embedded view has queries propagated from a declaration view at the beginning of the\n      // TQueries collection and up until a first content query declared in the embedded view. Only\n      // propagated LQueries are created at this point (LQuery corresponding to declared content\n      // queries will be instantiated from the content query instructions for each directive).\n      for (let i = 0; i < noOfInheritedQueries; i++) {\n        const tQuery = tQueries.getByIndex(i);\n        const parentLQuery = this.queries[tQuery.indexInDeclarationView];\n        viewLQueries.push(parentLQuery.clone());\n      }\n\n      return new LQueries_(viewLQueries);\n    }\n\n    return null;\n  }\n\n  insertView(tView: TView): void {\n    this.dirtyQueriesWithMatches(tView);\n  }\n\n  detachView(tView: TView): void {\n    this.dirtyQueriesWithMatches(tView);\n  }\n\n  private dirtyQueriesWithMatches(tView: TView) {\n    for (let i = 0; i < this.queries.length; i++) {\n      if (getTQuery(tView, i).matches !== null) {\n        this.queries[i].setDirty();\n      }\n    }\n  }\n}\n\nclass TQueryMetadata_ implements TQueryMetadata {\n  constructor(\n      public predicate: ProviderToken<unknown>|string[], public flags: QueryFlags,\n      public read: any = null) {}\n}\n\nclass TQueries_ implements TQueries {\n  constructor(private queries: TQuery[] = []) {}\n\n  elementStart(tView: TView, tNode: TNode): void {\n    ngDevMode &&\n        assertFirstCreatePass(\n            tView, 'Queries should collect results on the first template pass only');\n    for (let i = 0; i < this.queries.length; i++) {\n      this.queries[i].elementStart(tView, tNode);\n    }\n  }\n  elementEnd(tNode: TNode): void {\n    for (let i = 0; i < this.queries.length; i++) {\n      this.queries[i].elementEnd(tNode);\n    }\n  }\n  embeddedTView(tNode: TNode): TQueries|null {\n    let queriesForTemplateRef: TQuery[]|null = null;\n\n    for (let i = 0; i < this.length; i++) {\n      const childQueryIndex = queriesForTemplateRef !== null ? queriesForTemplateRef.length : 0;\n      const tqueryClone = this.getByIndex(i).embeddedTView(tNode, childQueryIndex);\n\n      if (tqueryClone) {\n        tqueryClone.indexInDeclarationView = i;\n        if (queriesForTemplateRef !== null) {\n          queriesForTemplateRef.push(tqueryClone);\n        } else {\n          queriesForTemplateRef = [tqueryClone];\n        }\n      }\n    }\n\n    return queriesForTemplateRef !== null ? new TQueries_(queriesForTemplateRef) : null;\n  }\n\n  template(tView: TView, tNode: TNode): void {\n    ngDevMode &&\n        assertFirstCreatePass(\n            tView, 'Queries should collect results on the first template pass only');\n    for (let i = 0; i < this.queries.length; i++) {\n      this.queries[i].template(tView, tNode);\n    }\n  }\n\n  getByIndex(index: number): TQuery {\n    ngDevMode && assertIndexInRange(this.queries, index);\n    return this.queries[index];\n  }\n\n  get length(): number {\n    return this.queries.length;\n  }\n\n  track(tquery: TQuery): void {\n    this.queries.push(tquery);\n  }\n}\n\nclass TQuery_ implements TQuery {\n  matches: number[]|null = null;\n  indexInDeclarationView = -1;\n  crossesNgTemplate = false;\n\n  /**\n   * A node index on which a query was declared (-1 for view queries and ones inherited from the\n   * declaration template). We use this index (alongside with _appliesToNextNode flag) to know\n   * when to apply content queries to elements in a template.\n   */\n  private _declarationNodeIndex: number;\n\n  /**\n   * A flag indicating if a given query still applies to nodes it is crossing. We use this flag\n   * (alongside with _declarationNodeIndex) to know when to stop applying content queries to\n   * elements in a template.\n   */\n  private _appliesToNextNode = true;\n\n  constructor(public metadata: TQueryMetadata, nodeIndex: number = -1) {\n    this._declarationNodeIndex = nodeIndex;\n  }\n\n  elementStart(tView: TView, tNode: TNode): void {\n    if (this.isApplyingToNode(tNode)) {\n      this.matchTNode(tView, tNode);\n    }\n  }\n\n  elementEnd(tNode: TNode): void {\n    if (this._declarationNodeIndex === tNode.index) {\n      this._appliesToNextNode = false;\n    }\n  }\n\n  template(tView: TView, tNode: TNode): void {\n    this.elementStart(tView, tNode);\n  }\n\n  embeddedTView(tNode: TNode, childQueryIndex: number): TQuery|null {\n    if (this.isApplyingToNode(tNode)) {\n      this.crossesNgTemplate = true;\n      // A marker indicating a `<ng-template>` element (a placeholder for query results from\n      // embedded views created based on this `<ng-template>`).\n      this.addMatch(-tNode.index, childQueryIndex);\n      return new TQuery_(this.metadata);\n    }\n    return null;\n  }\n\n  private isApplyingToNode(tNode: TNode): boolean {\n    if (this._appliesToNextNode &&\n        (this.metadata.flags & QueryFlags.descendants) !== QueryFlags.descendants) {\n      const declarationNodeIdx = this._declarationNodeIndex;\n      let parent = tNode.parent;\n      // Determine if a given TNode is a \"direct\" child of a node on which a content query was\n      // declared (only direct children of query's host node can match with the descendants: false\n      // option). There are 3 main use-case / conditions to consider here:\n      // - <needs-target><i #target></i></needs-target>: here <i #target> parent node is a query\n      // host node;\n      // - <needs-target><ng-template [ngIf]=\"true\"><i #target></i></ng-template></needs-target>:\n      // here <i #target> parent node is null;\n      // - <needs-target><ng-container><i #target></i></ng-container></needs-target>: here we need\n      // to go past `<ng-container>` to determine <i #target> parent node (but we shouldn't traverse\n      // up past the query's host node!).\n      while (parent !== null && (parent.type & TNodeType.ElementContainer) &&\n             parent.index !== declarationNodeIdx) {\n        parent = parent.parent;\n      }\n      return declarationNodeIdx === (parent !== null ? parent.index : -1);\n    }\n    return this._appliesToNextNode;\n  }\n\n  private matchTNode(tView: TView, tNode: TNode): void {\n    const predicate = this.metadata.predicate;\n    if (Array.isArray(predicate)) {\n      for (let i = 0; i < predicate.length; i++) {\n        const name = predicate[i];\n        this.matchTNodeWithReadOption(tView, tNode, getIdxOfMatchingSelector(tNode, name));\n        // Also try matching the name to a provider since strings can be used as DI tokens too.\n        this.matchTNodeWithReadOption(\n            tView, tNode, locateDirectiveOrProvider(tNode, tView, name, false, false));\n      }\n    } else {\n      if ((predicate as any) === ViewEngine_TemplateRef) {\n        if (tNode.type & TNodeType.Container) {\n          this.matchTNodeWithReadOption(tView, tNode, -1);\n        }\n      } else {\n        this.matchTNodeWithReadOption(\n            tView, tNode, locateDirectiveOrProvider(tNode, tView, predicate, false, false));\n      }\n    }\n  }\n\n  private matchTNodeWithReadOption(tView: TView, tNode: TNode, nodeMatchIdx: number|null): void {\n    if (nodeMatchIdx !== null) {\n      const read = this.metadata.read;\n      if (read !== null) {\n        if (read === ViewEngine_ElementRef || read === ViewContainerRef ||\n            read === ViewEngine_TemplateRef && (tNode.type & TNodeType.Container)) {\n          this.addMatch(tNode.index, -2);\n        } else {\n          const directiveOrProviderIdx =\n              locateDirectiveOrProvider(tNode, tView, read, false, false);\n          if (directiveOrProviderIdx !== null) {\n            this.addMatch(tNode.index, directiveOrProviderIdx);\n          }\n        }\n      } else {\n        this.addMatch(tNode.index, nodeMatchIdx);\n      }\n    }\n  }\n\n  private addMatch(tNodeIdx: number, matchIdx: number) {\n    if (this.matches === null) {\n      this.matches = [tNodeIdx, matchIdx];\n    } else {\n      this.matches.push(tNodeIdx, matchIdx);\n    }\n  }\n}\n\n/**\n * Iterates over local names for a given node and returns directive index\n * (or -1 if a local name points to an element).\n *\n * @param tNode static data of a node to check\n * @param selector selector to match\n * @returns directive index, -1 or null if a selector didn't match any of the local names\n */\nfunction getIdxOfMatchingSelector(tNode: TNode, selector: string): number|null {\n  const localNames = tNode.localNames;\n  if (localNames !== null) {\n    for (let i = 0; i < localNames.length; i += 2) {\n      if (localNames[i] === selector) {\n        return localNames[i + 1] as number;\n      }\n    }\n  }\n  return null;\n}\n\n\nfunction createResultByTNodeType(tNode: TNode, currentView: LView): any {\n  if (tNode.type & (TNodeType.AnyRNode | TNodeType.ElementContainer)) {\n    return createElementRef(tNode, currentView);\n  } else if (tNode.type & TNodeType.Container) {\n    return createTemplateRef(tNode, currentView);\n  }\n  return null;\n}\n\n\nfunction createResultForNode(lView: LView, tNode: TNode, matchingIdx: number, read: any): any {\n  if (matchingIdx === -1) {\n    // if read token and / or strategy is not specified, detect it using appropriate tNode type\n    return createResultByTNodeType(tNode, lView);\n  } else if (matchingIdx === -2) {\n    // read a special token from a node injector\n    return createSpecialToken(lView, tNode, read);\n  } else {\n    // read a token\n    return getNodeInjectable(lView, lView[TVIEW], matchingIdx, tNode as TElementNode);\n  }\n}\n\nfunction createSpecialToken(lView: LView, tNode: TNode, read: any): any {\n  if (read === ViewEngine_ElementRef) {\n    return createElementRef(tNode, lView);\n  } else if (read === ViewEngine_TemplateRef) {\n    return createTemplateRef(tNode, lView);\n  } else if (read === ViewContainerRef) {\n    ngDevMode && assertTNodeType(tNode, TNodeType.AnyRNode | TNodeType.AnyContainer);\n    return createContainerRef(\n        tNode as TElementNode | TContainerNode | TElementContainerNode, lView);\n  } else {\n    ngDevMode &&\n        throwError(\n            `Special token to read should be one of ElementRef, TemplateRef or ViewContainerRef but got ${\n                stringify(read)}.`);\n  }\n}\n\n/**\n * A helper function that creates query results for a given view. This function is meant to do the\n * processing once and only once for a given view instance (a set of results for a given view\n * doesn't change).\n */\nfunction materializeViewResults<T>(\n    tView: TView, lView: LView, tQuery: TQuery, queryIndex: number): (T|null)[] {\n  const lQuery = lView[QUERIES]!.queries![queryIndex];\n  if (lQuery.matches === null) {\n    const tViewData = tView.data;\n    const tQueryMatches = tQuery.matches!;\n    const result: T|null[] = [];\n    for (let i = 0; i < tQueryMatches.length; i += 2) {\n      const matchedNodeIdx = tQueryMatches[i];\n      if (matchedNodeIdx < 0) {\n        // we at the <ng-template> marker which might have results in views created based on this\n        // <ng-template> - those results will be in separate views though, so here we just leave\n        // null as a placeholder\n        result.push(null);\n      } else {\n        ngDevMode && assertIndexInRange(tViewData, matchedNodeIdx);\n        const tNode = tViewData[matchedNodeIdx] as TNode;\n        result.push(createResultForNode(lView, tNode, tQueryMatches[i + 1], tQuery.metadata.read));\n      }\n    }\n    lQuery.matches = result;\n  }\n\n  return lQuery.matches;\n}\n\n/**\n * A helper function that collects (already materialized) query results from a tree of views,\n * starting with a provided LView.\n */\nfunction collectQueryResults<T>(tView: TView, lView: LView, queryIndex: number, result: T[]): T[] {\n  const tQuery = tView.queries!.getByIndex(queryIndex);\n  const tQueryMatches = tQuery.matches;\n  if (tQueryMatches !== null) {\n    const lViewResults = materializeViewResults<T>(tView, lView, tQuery, queryIndex);\n\n    for (let i = 0; i < tQueryMatches.length; i += 2) {\n      const tNodeIdx = tQueryMatches[i];\n      if (tNodeIdx > 0) {\n        result.push(lViewResults[i / 2] as T);\n      } else {\n        const childQueryIndex = tQueryMatches[i + 1];\n\n        const declarationLContainer = lView[-tNodeIdx] as LContainer;\n        ngDevMode && assertLContainer(declarationLContainer);\n\n        // collect matches for views inserted in this container\n        for (let i = CONTAINER_HEADER_OFFSET; i < declarationLContainer.length; i++) {\n          const embeddedLView = declarationLContainer[i];\n          if (embeddedLView[DECLARATION_LCONTAINER] === embeddedLView[PARENT]) {\n            collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);\n          }\n        }\n\n        // collect matches for views created from this declaration container and inserted into\n        // different containers\n        if (declarationLContainer[MOVED_VIEWS] !== null) {\n          const embeddedLViews = declarationLContainer[MOVED_VIEWS]!;\n          for (let i = 0; i < embeddedLViews.length; i++) {\n            const embeddedLView = embeddedLViews[i];\n            collectQueryResults(embeddedLView[TVIEW], embeddedLView, childQueryIndex, result);\n          }\n        }\n      }\n    }\n  }\n  return result;\n}\n\n/**\n * Refreshes a query by combining matches from all active views and removing matches from deleted\n * views.\n *\n * @returns `true` if a query got dirty during change detection or if this is a static query\n * resolving in creation mode, `false` otherwise.\n *\n * @codeGenApi\n */\nexport function ɵɵqueryRefresh(queryList: QueryList<any>): boolean {\n  const lView = getLView();\n  const tView = getTView();\n  const queryIndex = getCurrentQueryIndex();\n\n  setCurrentQueryIndex(queryIndex + 1);\n\n  const tQuery = getTQuery(tView, queryIndex);\n  if (queryList.dirty &&\n      (isCreationMode(lView) ===\n       ((tQuery.metadata.flags & QueryFlags.isStatic) === QueryFlags.isStatic))) {\n    if (tQuery.matches === null) {\n      queryList.reset([]);\n    } else {\n      const result = tQuery.crossesNgTemplate ?\n          collectQueryResults(tView, lView, queryIndex, []) :\n          materializeViewResults(tView, lView, tQuery, queryIndex);\n      queryList.reset(result, unwrapElementRef);\n      queryList.notifyOnChanges();\n    }\n    return true;\n  }\n\n  return false;\n}\n\n/**\n * Creates new QueryList, stores the reference in LView and returns QueryList.\n *\n * @param predicate The type for which the query will search\n * @param flags Flags associated with the query\n * @param read What to save in the query\n *\n * @codeGenApi\n */\nexport function ɵɵviewQuery<T>(\n    predicate: ProviderToken<unknown>|string[], flags: QueryFlags, read?: any): void {\n  ngDevMode && assertNumber(flags, 'Expecting flags');\n  const tView = getTView();\n  if (tView.firstCreatePass) {\n    createTQuery(tView, new TQueryMetadata_(predicate, flags, read), -1);\n    if ((flags & QueryFlags.isStatic) === QueryFlags.isStatic) {\n      tView.staticViewQueries = true;\n    }\n  }\n  createLQuery<T>(tView, getLView(), flags);\n}\n\n/**\n * Registers a QueryList, associated with a content query, for later refresh (part of a view\n * refresh).\n *\n * @param directiveIndex Current directive index\n * @param predicate The type for which the query will search\n * @param flags Flags associated with the query\n * @param read What to save in the query\n * @returns QueryList<T>\n *\n * @codeGenApi\n */\nexport function ɵɵcontentQuery<T>(\n    directiveIndex: number, predicate: ProviderToken<unknown>|string[], flags: QueryFlags,\n    read?: any): void {\n  ngDevMode && assertNumber(flags, 'Expecting flags');\n  const tView = getTView();\n  if (tView.firstCreatePass) {\n    const tNode = getCurrentTNode()!;\n    createTQuery(tView, new TQueryMetadata_(predicate, flags, read), tNode.index);\n    saveContentQueryAndDirectiveIndex(tView, directiveIndex);\n    if ((flags & QueryFlags.isStatic) === QueryFlags.isStatic) {\n      tView.staticContentQueries = true;\n    }\n  }\n\n  createLQuery<T>(tView, getLView(), flags);\n}\n\n/**\n * Loads a QueryList corresponding to the current view or content query.\n *\n * @codeGenApi\n */\nexport function ɵɵloadQuery<T>(): QueryList<T> {\n  return loadQueryInternal<T>(getLView(), getCurrentQueryIndex());\n}\n\nfunction loadQueryInternal<T>(lView: LView, queryIndex: number): QueryList<T> {\n  ngDevMode &&\n      assertDefined(lView[QUERIES], 'LQueries should be defined when trying to load a query');\n  ngDevMode && assertIndexInRange(lView[QUERIES]!.queries, queryIndex);\n  return lView[QUERIES]!.queries[queryIndex].queryList;\n}\n\nfunction createLQuery<T>(tView: TView, lView: LView, flags: QueryFlags) {\n  const queryList = new QueryList<T>(\n      (flags & QueryFlags.emitDistinctChangesOnly) === QueryFlags.emitDistinctChangesOnly);\n  storeCleanupWithContext(tView, lView, queryList, queryList.destroy);\n\n  if (lView[QUERIES] === null) lView[QUERIES] = new LQueries_();\n  lView[QUERIES]!.queries.push(new LQuery_(queryList));\n}\n\nfunction createTQuery(tView: TView, metadata: TQueryMetadata, nodeIndex: number): void {\n  if (tView.queries === null) tView.queries = new TQueries_();\n  tView.queries.track(new TQuery_(metadata, nodeIndex));\n}\n\nfunction saveContentQueryAndDirectiveIndex(tView: TView, directiveIndex: number) {\n  const tViewContentQueries = tView.contentQueries || (tView.contentQueries = []);\n  const lastSavedDirectiveIndex =\n      tViewContentQueries.length ? tViewContentQueries[tViewContentQueries.length - 1] : -1;\n  if (directiveIndex !== lastSavedDirectiveIndex) {\n    tViewContentQueries.push(tView.queries!.length - 1, directiveIndex);\n  }\n}\n\nfunction getTQuery(tView: TView, index: number): TQuery {\n  ngDevMode && assertDefined(tView.queries, 'TQueries must be defined to retrieve a TQuery');\n  return tView.queries!.getByIndex(index);\n}\n"]}