@angular/material
Version:
Angular Material
283 lines • 39.7 kB
JavaScript
/**
* @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 { FocusKeyManager } from '@angular/cdk/a11y';
import { Directionality } from '@angular/cdk/bidi';
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, ElementRef, Input, Optional, QueryList, ViewEncapsulation, booleanAttribute, numberAttribute, } from '@angular/core';
import { Subject, merge } from 'rxjs';
import { startWith, switchMap, takeUntil } from 'rxjs/operators';
import { MatChip } from './chip';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/bidi";
/**
* Basic container component for the MatChip component.
*
* Extended by MatChipListbox and MatChipGrid for different interaction patterns.
*/
export class MatChipSet {
/** Combined stream of all of the child chips' focus events. */
get chipFocusChanges() {
return this._getChipStream(chip => chip._onFocus);
}
/** Combined stream of all of the child chips' destroy events. */
get chipDestroyedChanges() {
return this._getChipStream(chip => chip.destroyed);
}
/** Combined stream of all of the child chips' remove events. */
get chipRemovedChanges() {
return this._getChipStream(chip => chip.removed);
}
/** Whether the chip set is disabled. */
get disabled() {
return this._disabled;
}
set disabled(value) {
this._disabled = value;
this._syncChipsState();
}
/** Whether the chip list contains chips or not. */
get empty() {
return !this._chips || this._chips.length === 0;
}
/** The ARIA role applied to the chip set. */
get role() {
if (this._explicitRole) {
return this._explicitRole;
}
return this.empty ? null : this._defaultRole;
}
set role(value) {
this._explicitRole = value;
}
/** Whether any of the chips inside of this chip-set has focus. */
get focused() {
return this._hasFocusedChip();
}
constructor(_elementRef, _changeDetectorRef, _dir) {
this._elementRef = _elementRef;
this._changeDetectorRef = _changeDetectorRef;
this._dir = _dir;
/** Index of the last destroyed chip that had focus. */
this._lastDestroyedFocusedChipIndex = null;
/** Subject that emits when the component has been destroyed. */
this._destroyed = new Subject();
/** Role to use if it hasn't been overwritten by the user. */
this._defaultRole = 'presentation';
this._disabled = false;
/** Tabindex of the chip set. */
this.tabIndex = 0;
this._explicitRole = null;
/** Flat list of all the actions contained within the chips. */
this._chipActions = new QueryList();
}
ngAfterViewInit() {
this._setUpFocusManagement();
this._trackChipSetChanges();
this._trackDestroyedFocusedChip();
}
ngOnDestroy() {
this._keyManager?.destroy();
this._chipActions.destroy();
this._destroyed.next();
this._destroyed.complete();
}
/** Checks whether any of the chips is focused. */
_hasFocusedChip() {
return this._chips && this._chips.some(chip => chip._hasFocus());
}
/** Syncs the chip-set's state with the individual chips. */
_syncChipsState() {
if (this._chips) {
this._chips.forEach(chip => {
chip.disabled = this._disabled;
chip._changeDetectorRef.markForCheck();
});
}
}
/** Dummy method for subclasses to override. Base chip set cannot be focused. */
focus() { }
/** Handles keyboard events on the chip set. */
_handleKeydown(event) {
if (this._originatesFromChip(event)) {
this._keyManager.onKeydown(event);
}
}
/**
* Utility to ensure all indexes are valid.
*
* @param index The index to be checked.
* @returns True if the index is valid for our list of chips.
*/
_isValidIndex(index) {
return index >= 0 && index < this._chips.length;
}
/**
* Removes the `tabindex` from the chip set and resets it back afterwards, allowing the
* user to tab out of it. This prevents the set from capturing focus and redirecting
* it back to the first chip, creating a focus trap, if it user tries to tab away.
*/
_allowFocusEscape() {
if (this.tabIndex !== -1) {
const previousTabIndex = this.tabIndex;
this.tabIndex = -1;
this._changeDetectorRef.markForCheck();
// Note that this needs to be a `setTimeout`, because a `Promise.resolve`
// doesn't allow enough time for the focus to escape.
setTimeout(() => {
this.tabIndex = previousTabIndex;
this._changeDetectorRef.markForCheck();
});
}
}
/**
* Gets a stream of events from all the chips within the set.
* The stream will automatically incorporate any newly-added chips.
*/
_getChipStream(mappingFunction) {
return this._chips.changes.pipe(startWith(null), switchMap(() => merge(...this._chips.map(mappingFunction))));
}
/** Checks whether an event comes from inside a chip element. */
_originatesFromChip(event) {
let currentElement = event.target;
while (currentElement && currentElement !== this._elementRef.nativeElement) {
if (currentElement.classList.contains('mat-mdc-chip')) {
return true;
}
currentElement = currentElement.parentElement;
}
return false;
}
/** Sets up the chip set's focus management logic. */
_setUpFocusManagement() {
// Create a flat `QueryList` containing the actions of all of the chips.
// This allows us to navigate both within the chip and move to the next/previous
// one using the existing `ListKeyManager`.
this._chips.changes.pipe(startWith(this._chips)).subscribe((chips) => {
const actions = [];
chips.forEach(chip => chip._getActions().forEach(action => actions.push(action)));
this._chipActions.reset(actions);
this._chipActions.notifyOnChanges();
});
this._keyManager = new FocusKeyManager(this._chipActions)
.withVerticalOrientation()
.withHorizontalOrientation(this._dir ? this._dir.value : 'ltr')
.withHomeAndEnd()
.skipPredicate(action => this._skipPredicate(action));
// Keep the manager active index in sync so that navigation picks
// up from the current chip if the user clicks into the list directly.
this.chipFocusChanges.pipe(takeUntil(this._destroyed)).subscribe(({ chip }) => {
const action = chip._getSourceAction(document.activeElement);
if (action) {
this._keyManager.updateActiveItem(action);
}
});
this._dir?.change
.pipe(takeUntil(this._destroyed))
.subscribe(direction => this._keyManager.withHorizontalOrientation(direction));
}
/**
* Determines if key manager should avoid putting a given chip action in the tab index. Skip
* non-interactive and disabled actions since the user can't do anything with them.
*/
_skipPredicate(action) {
// Skip chips that the user cannot interact with. `mat-chip-set` does not permit focusing disabled
// chips.
return !action.isInteractive || action.disabled;
}
/** Listens to changes in the chip set and syncs up the state of the individual chips. */
_trackChipSetChanges() {
this._chips.changes.pipe(startWith(null), takeUntil(this._destroyed)).subscribe(() => {
if (this.disabled) {
// Since this happens after the content has been
// checked, we need to defer it to the next tick.
Promise.resolve().then(() => this._syncChipsState());
}
this._redirectDestroyedChipFocus();
});
}
/** Starts tracking the destroyed chips in order to capture the focused one. */
_trackDestroyedFocusedChip() {
this.chipDestroyedChanges.pipe(takeUntil(this._destroyed)).subscribe((event) => {
const chipArray = this._chips.toArray();
const chipIndex = chipArray.indexOf(event.chip);
// If the focused chip is destroyed, save its index so that we can move focus to the next
// chip. We only save the index here, rather than move the focus immediately, because we want
// to wait until the chip is removed from the chip list before focusing the next one. This
// allows us to keep focus on the same index if the chip gets swapped out.
if (this._isValidIndex(chipIndex) && event.chip._hasFocus()) {
this._lastDestroyedFocusedChipIndex = chipIndex;
}
});
}
/**
* Finds the next appropriate chip to move focus to,
* if the currently-focused chip is destroyed.
*/
_redirectDestroyedChipFocus() {
if (this._lastDestroyedFocusedChipIndex == null) {
return;
}
if (this._chips.length) {
const newIndex = Math.min(this._lastDestroyedFocusedChipIndex, this._chips.length - 1);
const chipToFocus = this._chips.toArray()[newIndex];
if (chipToFocus.disabled) {
// If we're down to one disabled chip, move focus back to the set.
if (this._chips.length === 1) {
this.focus();
}
else {
this._keyManager.setPreviousItemActive();
}
}
else {
chipToFocus.focus();
}
}
else {
this.focus();
}
this._lastDestroyedFocusedChipIndex = null;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.0-next.2", ngImport: i0, type: MatChipSet, deps: [{ token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: i1.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "16.1.0", version: "18.2.0-next.2", type: MatChipSet, isStandalone: true, selector: "mat-chip-set", inputs: { disabled: ["disabled", "disabled", booleanAttribute], role: "role", tabIndex: ["tabIndex", "tabIndex", (value) => (value == null ? 0 : numberAttribute(value))] }, host: { listeners: { "keydown": "_handleKeydown($event)" }, properties: { "attr.role": "role" }, classAttribute: "mat-mdc-chip-set mdc-evolution-chip-set" }, queries: [{ propertyName: "_chips", predicate: MatChip, descendants: true }], ngImport: i0, template: `
<div class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</div>
`, isInline: true, styles: [".mat-mdc-chip-set{display:flex}.mat-mdc-chip-set:focus{outline:none}.mat-mdc-chip-set .mdc-evolution-chip-set__chips{min-width:100%;margin-left:-8px;margin-right:0}.mat-mdc-chip-set .mdc-evolution-chip{margin:4px 0 4px 8px}[dir=rtl] .mat-mdc-chip-set .mdc-evolution-chip-set__chips{margin-left:0;margin-right:-8px}[dir=rtl] .mat-mdc-chip-set .mdc-evolution-chip{margin-left:0;margin-right:8px}.mdc-evolution-chip-set__chips{display:flex;flex-flow:wrap;min-width:0}.mat-mdc-chip-set-stacked{flex-direction:column;align-items:flex-start}.mat-mdc-chip-set-stacked .mat-mdc-chip{width:100%}.mat-mdc-chip-set-stacked .mdc-evolution-chip__graphic{flex-grow:0}.mat-mdc-chip-set-stacked .mdc-evolution-chip__action--primary{flex-basis:100%;justify-content:start}input.mat-mdc-chip-input{flex:1 0 150px;margin-left:8px}[dir=rtl] input.mat-mdc-chip-input{margin-left:0;margin-right:8px}"], changeDetection: i0.ChangeDetectionStrategy.OnPush, encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.0-next.2", ngImport: i0, type: MatChipSet, decorators: [{
type: Component,
args: [{ selector: 'mat-chip-set', template: `
<div class="mdc-evolution-chip-set__chips" role="presentation">
<ng-content></ng-content>
</div>
`, host: {
'class': 'mat-mdc-chip-set mdc-evolution-chip-set',
'(keydown)': '_handleKeydown($event)',
'[attr.role]': 'role',
}, encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush, standalone: true, styles: [".mat-mdc-chip-set{display:flex}.mat-mdc-chip-set:focus{outline:none}.mat-mdc-chip-set .mdc-evolution-chip-set__chips{min-width:100%;margin-left:-8px;margin-right:0}.mat-mdc-chip-set .mdc-evolution-chip{margin:4px 0 4px 8px}[dir=rtl] .mat-mdc-chip-set .mdc-evolution-chip-set__chips{margin-left:0;margin-right:-8px}[dir=rtl] .mat-mdc-chip-set .mdc-evolution-chip{margin-left:0;margin-right:8px}.mdc-evolution-chip-set__chips{display:flex;flex-flow:wrap;min-width:0}.mat-mdc-chip-set-stacked{flex-direction:column;align-items:flex-start}.mat-mdc-chip-set-stacked .mat-mdc-chip{width:100%}.mat-mdc-chip-set-stacked .mdc-evolution-chip__graphic{flex-grow:0}.mat-mdc-chip-set-stacked .mdc-evolution-chip__action--primary{flex-basis:100%;justify-content:start}input.mat-mdc-chip-input{flex:1 0 150px;margin-left:8px}[dir=rtl] input.mat-mdc-chip-input{margin-left:0;margin-right:8px}"] }]
}], ctorParameters: () => [{ type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: i1.Directionality, decorators: [{
type: Optional
}] }], propDecorators: { disabled: [{
type: Input,
args: [{ transform: booleanAttribute }]
}], role: [{
type: Input
}], tabIndex: [{
type: Input,
args: [{
transform: (value) => (value == null ? 0 : numberAttribute(value)),
}]
}], _chips: [{
type: ContentChildren,
args: [MatChip, {
// We need to use `descendants: true`, because Ivy will no longer match
// indirect descendants if it's left as false.
descendants: true,
}]
}] } });
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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 {FocusKeyManager} from '@angular/cdk/a11y';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {\n  AfterViewInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  ElementRef,\n  Input,\n  OnDestroy,\n  Optional,\n  QueryList,\n  ViewEncapsulation,\n  booleanAttribute,\n  numberAttribute,\n} from '@angular/core';\nimport {Observable, Subject, merge} from 'rxjs';\nimport {startWith, switchMap, takeUntil} from 'rxjs/operators';\nimport {MatChip, MatChipEvent} from './chip';\nimport {MatChipAction} from './chip-action';\n\n/**\n * Basic container component for the MatChip component.\n *\n * Extended by MatChipListbox and MatChipGrid for different interaction patterns.\n */\n@Component({\n  selector: 'mat-chip-set',\n  template: `\n    <div class=\"mdc-evolution-chip-set__chips\" role=\"presentation\">\n      <ng-content></ng-content>\n    </div>\n  `,\n  styleUrl: 'chip-set.css',\n  host: {\n    'class': 'mat-mdc-chip-set mdc-evolution-chip-set',\n    '(keydown)': '_handleKeydown($event)',\n    '[attr.role]': 'role',\n  },\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  standalone: true,\n})\nexport class MatChipSet implements AfterViewInit, OnDestroy {\n  /** Index of the last destroyed chip that had focus. */\n  private _lastDestroyedFocusedChipIndex: number | null = null;\n\n  /** Used to manage focus within the chip list. */\n  protected _keyManager: FocusKeyManager<MatChipAction>;\n\n  /** Subject that emits when the component has been destroyed. */\n  protected _destroyed = new Subject<void>();\n\n  /** Role to use if it hasn't been overwritten by the user. */\n  protected _defaultRole = 'presentation';\n\n  /** Combined stream of all of the child chips' focus events. */\n  get chipFocusChanges(): Observable<MatChipEvent> {\n    return this._getChipStream(chip => chip._onFocus);\n  }\n\n  /** Combined stream of all of the child chips' destroy events. */\n  get chipDestroyedChanges(): Observable<MatChipEvent> {\n    return this._getChipStream(chip => chip.destroyed);\n  }\n\n  /** Combined stream of all of the child chips' remove events. */\n  get chipRemovedChanges(): Observable<MatChipEvent> {\n    return this._getChipStream(chip => chip.removed);\n  }\n\n  /** Whether the chip set is disabled. */\n  @Input({transform: booleanAttribute})\n  get disabled(): boolean {\n    return this._disabled;\n  }\n  set disabled(value: boolean) {\n    this._disabled = value;\n    this._syncChipsState();\n  }\n  protected _disabled: boolean = false;\n\n  /** Whether the chip list contains chips or not. */\n  get empty(): boolean {\n    return !this._chips || this._chips.length === 0;\n  }\n\n  /** The ARIA role applied to the chip set. */\n  @Input()\n  get role(): string | null {\n    if (this._explicitRole) {\n      return this._explicitRole;\n    }\n\n    return this.empty ? null : this._defaultRole;\n  }\n\n  /** Tabindex of the chip set. */\n  @Input({\n    transform: (value: unknown) => (value == null ? 0 : numberAttribute(value)),\n  })\n  tabIndex: number = 0;\n\n  set role(value: string | null) {\n    this._explicitRole = value;\n  }\n  private _explicitRole: string | null = null;\n\n  /** Whether any of the chips inside of this chip-set has focus. */\n  get focused(): boolean {\n    return this._hasFocusedChip();\n  }\n\n  /** The chips that are part of this chip set. */\n  @ContentChildren(MatChip, {\n    // We need to use `descendants: true`, because Ivy will no longer match\n    // indirect descendants if it's left as false.\n    descendants: true,\n  })\n  _chips: QueryList<MatChip>;\n\n  /** Flat list of all the actions contained within the chips. */\n  _chipActions = new QueryList<MatChipAction>();\n\n  constructor(\n    protected _elementRef: ElementRef<HTMLElement>,\n    protected _changeDetectorRef: ChangeDetectorRef,\n    @Optional() private _dir: Directionality,\n  ) {}\n\n  ngAfterViewInit() {\n    this._setUpFocusManagement();\n    this._trackChipSetChanges();\n    this._trackDestroyedFocusedChip();\n  }\n\n  ngOnDestroy() {\n    this._keyManager?.destroy();\n    this._chipActions.destroy();\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /** Checks whether any of the chips is focused. */\n  protected _hasFocusedChip() {\n    return this._chips && this._chips.some(chip => chip._hasFocus());\n  }\n\n  /** Syncs the chip-set's state with the individual chips. */\n  protected _syncChipsState() {\n    if (this._chips) {\n      this._chips.forEach(chip => {\n        chip.disabled = this._disabled;\n        chip._changeDetectorRef.markForCheck();\n      });\n    }\n  }\n\n  /** Dummy method for subclasses to override. Base chip set cannot be focused. */\n  focus() {}\n\n  /** Handles keyboard events on the chip set. */\n  _handleKeydown(event: KeyboardEvent) {\n    if (this._originatesFromChip(event)) {\n      this._keyManager.onKeydown(event);\n    }\n  }\n\n  /**\n   * Utility to ensure all indexes are valid.\n   *\n   * @param index The index to be checked.\n   * @returns True if the index is valid for our list of chips.\n   */\n  protected _isValidIndex(index: number): boolean {\n    return index >= 0 && index < this._chips.length;\n  }\n\n  /**\n   * Removes the `tabindex` from the chip set and resets it back afterwards, allowing the\n   * user to tab out of it. This prevents the set from capturing focus and redirecting\n   * it back to the first chip, creating a focus trap, if it user tries to tab away.\n   */\n  protected _allowFocusEscape() {\n    if (this.tabIndex !== -1) {\n      const previousTabIndex = this.tabIndex;\n      this.tabIndex = -1;\n      this._changeDetectorRef.markForCheck();\n\n      // Note that this needs to be a `setTimeout`, because a `Promise.resolve`\n      // doesn't allow enough time for the focus to escape.\n      setTimeout(() => {\n        this.tabIndex = previousTabIndex;\n        this._changeDetectorRef.markForCheck();\n      });\n    }\n  }\n\n  /**\n   * Gets a stream of events from all the chips within the set.\n   * The stream will automatically incorporate any newly-added chips.\n   */\n  protected _getChipStream<T, C extends MatChip = MatChip>(\n    mappingFunction: (chip: C) => Observable<T>,\n  ): Observable<T> {\n    return this._chips.changes.pipe(\n      startWith(null),\n      switchMap(() => merge(...(this._chips as QueryList<C>).map(mappingFunction))),\n    );\n  }\n\n  /** Checks whether an event comes from inside a chip element. */\n  protected _originatesFromChip(event: Event): boolean {\n    let currentElement = event.target as HTMLElement | null;\n\n    while (currentElement && currentElement !== this._elementRef.nativeElement) {\n      if (currentElement.classList.contains('mat-mdc-chip')) {\n        return true;\n      }\n      currentElement = currentElement.parentElement;\n    }\n    return false;\n  }\n\n  /** Sets up the chip set's focus management logic. */\n  private _setUpFocusManagement() {\n    // Create a flat `QueryList` containing the actions of all of the chips.\n    // This allows us to navigate both within the chip and move to the next/previous\n    // one using the existing `ListKeyManager`.\n    this._chips.changes.pipe(startWith(this._chips)).subscribe((chips: QueryList<MatChip>) => {\n      const actions: MatChipAction[] = [];\n      chips.forEach(chip => chip._getActions().forEach(action => actions.push(action)));\n      this._chipActions.reset(actions);\n      this._chipActions.notifyOnChanges();\n    });\n\n    this._keyManager = new FocusKeyManager(this._chipActions)\n      .withVerticalOrientation()\n      .withHorizontalOrientation(this._dir ? this._dir.value : 'ltr')\n      .withHomeAndEnd()\n      .skipPredicate(action => this._skipPredicate(action));\n\n    // Keep the manager active index in sync so that navigation picks\n    // up from the current chip if the user clicks into the list directly.\n    this.chipFocusChanges.pipe(takeUntil(this._destroyed)).subscribe(({chip}) => {\n      const action = chip._getSourceAction(document.activeElement as Element);\n\n      if (action) {\n        this._keyManager.updateActiveItem(action);\n      }\n    });\n\n    this._dir?.change\n      .pipe(takeUntil(this._destroyed))\n      .subscribe(direction => this._keyManager.withHorizontalOrientation(direction));\n  }\n\n  /**\n   * Determines if key manager should avoid putting a given chip action in the tab index. Skip\n   * non-interactive and disabled actions since the user can't do anything with them.\n   */\n  protected _skipPredicate(action: MatChipAction): boolean {\n    // Skip chips that the user cannot interact with. `mat-chip-set` does not permit focusing disabled\n    // chips.\n    return !action.isInteractive || action.disabled;\n  }\n\n  /** Listens to changes in the chip set and syncs up the state of the individual chips. */\n  private _trackChipSetChanges() {\n    this._chips.changes.pipe(startWith(null), takeUntil(this._destroyed)).subscribe(() => {\n      if (this.disabled) {\n        // Since this happens after the content has been\n        // checked, we need to defer it to the next tick.\n        Promise.resolve().then(() => this._syncChipsState());\n      }\n\n      this._redirectDestroyedChipFocus();\n    });\n  }\n\n  /** Starts tracking the destroyed chips in order to capture the focused one. */\n  private _trackDestroyedFocusedChip() {\n    this.chipDestroyedChanges.pipe(takeUntil(this._destroyed)).subscribe((event: MatChipEvent) => {\n      const chipArray = this._chips.toArray();\n      const chipIndex = chipArray.indexOf(event.chip);\n\n      // If the focused chip is destroyed, save its index so that we can move focus to the next\n      // chip. We only save the index here, rather than move the focus immediately, because we want\n      // to wait until the chip is removed from the chip list before focusing the next one. This\n      // allows us to keep focus on the same index if the chip gets swapped out.\n      if (this._isValidIndex(chipIndex) && event.chip._hasFocus()) {\n        this._lastDestroyedFocusedChipIndex = chipIndex;\n      }\n    });\n  }\n\n  /**\n   * Finds the next appropriate chip to move focus to,\n   * if the currently-focused chip is destroyed.\n   */\n  private _redirectDestroyedChipFocus() {\n    if (this._lastDestroyedFocusedChipIndex == null) {\n      return;\n    }\n\n    if (this._chips.length) {\n      const newIndex = Math.min(this._lastDestroyedFocusedChipIndex, this._chips.length - 1);\n      const chipToFocus = this._chips.toArray()[newIndex];\n\n      if (chipToFocus.disabled) {\n        // If we're down to one disabled chip, move focus back to the set.\n        if (this._chips.length === 1) {\n          this.focus();\n        } else {\n          this._keyManager.setPreviousItemActive();\n        }\n      } else {\n        chipToFocus.focus();\n      }\n    } else {\n      this.focus();\n    }\n\n    this._lastDestroyedFocusedChipIndex = null;\n  }\n}\n"]}