/**
 * @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 { EventEmitter } from '../event_emitter';
import { arrayEquals, flatten } from '../util/array_utils';
import { getSymbolIterator } from '../util/symbol';
function symbolIterator() {
    return this._results[getSymbolIterator()]();
}
/**
 * An unmodifiable list of items that Angular keeps up to date when the state
 * of the application changes.
 *
 * The type of object that {@link ViewChildren}, {@link ContentChildren}, and {@link QueryList}
 * provide.
 *
 * Implements an iterable interface, therefore it can be used in both ES6
 * javascript `for (var i of items)` loops as well as in Angular templates with
 * `*ngFor="let i of myList"`.
 *
 * Changes can be observed by subscribing to the changes `Observable`.
 *
 * NOTE: In the future this class will implement an `Observable` interface.
 *
 * @usageNotes
 * ### Example
 * ```typescript
 * @Component({...})
 * class Container {
 *   @ViewChildren(Item) items:QueryList<Item>;
 * }
 * ```
 *
 * @publicApi
 */
export class QueryList {
    /**
     * @param emitDistinctChangesOnly Whether `QueryList.changes` should fire only when actual change
     *     has occurred. Or if it should fire when query is recomputed. (recomputing could resolve in
     *     the same result)
     */
    constructor(_emitDistinctChangesOnly = false) {
        this._emitDistinctChangesOnly = _emitDistinctChangesOnly;
        this.dirty = true;
        this._results = [];
        this._changesDetected = false;
        this._changes = null;
        this.length = 0;
        this.first = undefined;
        this.last = undefined;
        // This function should be declared on the prototype, but doing so there will cause the class
        // declaration to have side-effects and become not tree-shakable. For this reason we do it in
        // the constructor.
        // [getSymbolIterator()](): Iterator<T> { ... }
        const symbol = getSymbolIterator();
        const proto = QueryList.prototype;
        if (!proto[symbol])
            proto[symbol] = symbolIterator;
    }
    /**
     * Returns `Observable` of `QueryList` notifying the subscriber of changes.
     */
    get changes() {
        return this._changes || (this._changes = new EventEmitter());
    }
    /**
     * Returns the QueryList entry at `index`.
     */
    get(index) {
        return this._results[index];
    }
    /**
     * See
     * [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)
     */
    map(fn) {
        return this._results.map(fn);
    }
    /**
     * See
     * [Array.filter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter)
     */
    filter(fn) {
        return this._results.filter(fn);
    }
    /**
     * See
     * [Array.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)
     */
    find(fn) {
        return this._results.find(fn);
    }
    /**
     * See
     * [Array.reduce](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
     */
    reduce(fn, init) {
        return this._results.reduce(fn, init);
    }
    /**
     * See
     * [Array.forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)
     */
    forEach(fn) {
        this._results.forEach(fn);
    }
    /**
     * See
     * [Array.some](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)
     */
    some(fn) {
        return this._results.some(fn);
    }
    /**
     * Returns a copy of the internal results list as an Array.
     */
    toArray() {
        return this._results.slice();
    }
    toString() {
        return this._results.toString();
    }
    /**
     * Updates the stored data of the query list, and resets the `dirty` flag to `false`, so that
     * on change detection, it will not notify of changes to the queries, unless a new change
     * occurs.
     *
     * @param resultsTree The query results to store
     * @param identityAccessor Optional function for extracting stable object identity from a value
     *    in the array. This function is executed for each element of the query result list while
     *    comparing current query list with the new one (provided as a first argument of the `reset`
     *    function) to detect if the lists are different. If the function is not provided, elements
     *    are compared as is (without any pre-processing).
     */
    reset(resultsTree, identityAccessor) {
        // Cast to `QueryListInternal` so that we can mutate fields which are readonly for the usage of
        // QueryList (but not for QueryList itself.)
        const self = this;
        self.dirty = false;
        const newResultFlat = flatten(resultsTree);
        if (this._changesDetected = !arrayEquals(self._results, newResultFlat, identityAccessor)) {
            self._results = newResultFlat;
            self.length = newResultFlat.length;
            self.last = newResultFlat[this.length - 1];
            self.first = newResultFlat[0];
        }
    }
    /**
     * Triggers a change event by emitting on the `changes` {@link EventEmitter}.
     */
    notifyOnChanges() {
        if (this._changes && (this._changesDetected || !this._emitDistinctChangesOnly))
            this._changes.emit(this);
    }
    /** internal */
    setDirty() {
        this.dirty = true;
    }
    /** internal */
    destroy() {
        this.changes.complete();
        this.changes.unsubscribe();
    }
}
Symbol.iterator;
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Or if it should fire when query is recomputed. (recomputing could resolve in\n   *     the same result)\n   */\n  constructor(private _emitDistinctChangesOnly: boolean = false) {\n    // This function should be declared on the prototype, but doing so there will cause the class\n    // declaration to have side-effects and become not tree-shakable. For this reason we do it in\n    // the constructor.\n    // [getSymbolIterator()](): Iterator<T> { ... }\n    const symbol = getSymbolIterator();\n    const proto = QueryList.prototype as any;\n    if (!proto[symbol]) proto[symbol] = symbolIterator;\n  }\n\n  /**\n   * Returns the QueryList entry at `index`.\n   */\n  get(index: number): T|undefined {\n    return this._results[index];\n  }\n\n  /**\n   * See\n   * [Array.map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map)\n   */\n  map<U>(fn: (item: T, index: number, array: T[]) => U): U[] {\n    return this._results.map(fn);\n  }\n\n  /**\n   * See\n   * [Array.filter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter)\n   */\n  filter(fn: (item: T, index: number, array: T[]) => boolean): T[] {\n    return this._results.filter(fn);\n  }\n\n  /**\n   * See\n   * [Array.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)\n   */\n  find(fn: (item: T, index: number, array: T[]) => boolean): T|undefined {\n    return this._results.find(fn);\n  }\n\n  /**\n   * See\n   * [Array.reduce](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)\n   */\n  reduce<U>(fn: (prevValue: U, curValue: T, curIndex: number, array: T[]) => U, init: U): U {\n    return this._results.reduce(fn, init);\n  }\n\n  /**\n   * See\n   * [Array.forEach](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)\n   */\n  forEach(fn: (item: T, index: number, array: T[]) => void): void {\n    this._results.forEach(fn);\n  }\n\n  /**\n   * See\n   * [Array.some](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)\n   */\n  some(fn: (value: T, index: number, array: T[]) => boolean): boolean {\n    return this._results.some(fn);\n  }\n\n  /**\n   * Returns a copy of the internal results list as an Array.\n   */\n  toArray(): T[] {\n    return this._results.slice();\n  }\n\n  toString(): string {\n    return this._results.toString();\n  }\n\n  /**\n   * Updates the stored data of the query list, and resets the `dirty` flag to `false`, so that\n   * on change detection, it will not notify of changes to the queries, unless a new change\n   * occurs.\n   *\n   * @param resultsTree The query results to store\n   * @param identityAccessor Optional function for extracting stable object identity from a value\n   *    in the array. This function is executed for each element of the query result list while\n   *    comparing current query list with the new one (provided as a first argument of the `reset`\n   *    function) to detect if the lists are different. If the function is not provided, elements\n   *    are compared as is (without any pre-processing).\n   */\n  reset(resultsTree: Array<T|any[]>, identityAccessor?: (value: T) => unknown): void {\n    // Cast to `QueryListInternal` so that we can mutate fields which are readonly for the usage of\n    // QueryList (but not for QueryList itself.)\n    const self = this as QueryListInternal<T>;\n    (self as {dirty: boolean}).dirty = false;\n    const newResultFlat = flatten(resultsTree);\n    if (this._changesDetected = !arrayEquals(self._results, newResultFlat, identityAccessor)) {\n      self._results = newResultFlat;\n      self.length = newResultFlat.length;\n      self.last = newResultFlat[this.length - 1];\n      self.first = newResultFlat[0];\n    }\n  }\n\n  /**\n   * Triggers a change event by emitting on the `changes` {@link EventEmitter}.\n   */\n  notifyOnChanges(): void {\n    if (this._changes && (this._changesDetected || !this._emitDistinctChangesOnly))\n      this._changes.emit(this);\n  }\n\n  /** internal */\n  setDirty() {\n    (this as {dirty: boolean}).dirty = true;\n  }\n\n  /** internal */\n  destroy(): void {\n    (this.changes as EventEmitter<any>).complete();\n    (this.changes as EventEmitter<any>).unsubscribe();\n  }\n\n  // The implementation of `Symbol.iterator` should be declared here, but this would cause\n  // tree-shaking issues with `QueryList. So instead, it's added in the constructor (see comments\n  // there) and this declaration is left here to ensure that TypeScript considers QueryList to\n  // implement the Iterable interface. This is required for template type-checking of NgFor loops\n  // over QueryLists to work correctly, since QueryList must be assignable to NgIterable.\n  [Symbol.iterator]!: () => Iterator<T>;\n}\n\n/**\n * Internal set of APIs used by the framework. (not to be made public)\n */\ninterface QueryListInternal<T> extends QueryList<T> {\n  reset(a: any[]): void;\n  notifyOnChanges(): void;\n  length: number;\n  last: T;\n  first: T;\n}\n"]}