41 lines
1.2 KiB
TypeScript
41 lines
1.2 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 {isBlank} from '../facade/lang';
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import {InvalidPipeArgumentError} from './invalid_pipe_argument_error';
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/**
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* @ngModule CommonModule
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* @whatItDoes Generic selector that displays the string that matches the current value.
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* @howToUse `expression | i18nSelect:mapping`
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* @description
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*
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* Where:
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* - `mapping`: is an object that indicates the text that should be displayed
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* for different values of the provided `expression`.
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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='I18nSelectPipeComponent'}
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*
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* @experimental
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*/
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@Pipe({name: 'i18nSelect', pure: true})
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export class I18nSelectPipe implements PipeTransform {
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transform(value: string, mapping: {[key: string]: string}): string {
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if (isBlank(value)) return '';
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if (typeof mapping !== 'object' || mapping === null) {
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throw new InvalidPipeArgumentError(I18nSelectPipe, mapping);
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}
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return mapping[value] || '';
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}
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}
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