c33fda2607
Subclassing errors is problematic since Error returns a new instance. All of the patching which we do than prevent proper application of source maps. PR Close #14160
48 lines
1.4 KiB
TypeScript
48 lines
1.4 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Pipe, PipeTransform} from '@angular/core';
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import {NgLocalization, getPluralCategory} from '../localization';
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import {invalidPipeArgumentError} from './invalid_pipe_argument_error';
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const _INTERPOLATION_REGEXP: RegExp = /#/g;
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/**
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* @ngModule CommonModule
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* @whatItDoes Maps a value to a string that pluralizes the value according to locale rules.
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* @howToUse `expression | i18nPlural:mapping`
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* @description
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*
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* Where:
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* - `expression` is a number.
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* - `mapping` is an object that mimics the ICU format, see
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* http://userguide.icu-project.org/formatparse/messages
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*
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* ## Example
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*
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* {@example common/pipes/ts/i18n_pipe.ts region='I18nPluralPipeComponent'}
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*
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* @experimental
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*/
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@Pipe({name: 'i18nPlural', pure: true})
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export class I18nPluralPipe implements PipeTransform {
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constructor(private _localization: NgLocalization) {}
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transform(value: number, pluralMap: {[count: string]: string}): string {
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if (value == null) return '';
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if (typeof pluralMap !== 'object' || pluralMap === null) {
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throw invalidPipeArgumentError(I18nPluralPipe, pluralMap);
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}
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const key = getPluralCategory(value, Object.keys(pluralMap), this._localization);
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return pluralMap[key].replace(_INTERPOLATION_REGEXP, value.toString());
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}
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}
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