63 lines
1.6 KiB
TypeScript
63 lines
1.6 KiB
TypeScript
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import {
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CONST,
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isStringMap,
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StringWrapper,
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isPresent,
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RegExpWrapper
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} from 'angular2/src/facade/lang';
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import {Injectable, PipeTransform, Pipe} from 'angular2/core';
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import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
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var interpolationExp: RegExp = RegExpWrapper.create('#');
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/**
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*
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* Maps a value to a string that pluralizes the value properly.
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*
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* ## Usage
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*
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* expression | i18nPlural:mapping
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*
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* where `expression` is a number and `mapping` is an object that indicates the proper text for
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* when the `expression` evaluates to 0, 1, or some other number. You can interpolate the actual
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* value into the text using the `#` sign.
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*
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* ## Example
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*
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* ```
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* <div>
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* {{ messages.length | i18nPlural: messageMapping }}
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* </div>
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*
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* class MyApp {
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* messages: any[];
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* messageMapping: any = {
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* '=0': 'No messages.',
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* '=1': 'One message.',
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* 'other': '# messages.'
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* }
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* ...
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* }
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* ```
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*
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*/
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@CONST()
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@Pipe({name: 'i18nPlural', pure: true})
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@Injectable()
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export class I18nPluralPipe implements PipeTransform {
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transform(value: number, args: any[] = null): string {
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var key: string;
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var valueStr: string;
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var pluralMap: {[count: string]: string} = args[0];
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if (!isStringMap(pluralMap)) {
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throw new InvalidPipeArgumentException(I18nPluralPipe, pluralMap);
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}
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key = value === 0 || value === 1 ? `=${value}` : 'other';
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valueStr = isPresent(value) ? value.toString() : '';
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return StringWrapper.replaceAll(pluralMap[key], interpolationExp, valueStr);
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}
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}
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