59 lines
1.2 KiB
TypeScript
59 lines
1.2 KiB
TypeScript
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import {isString, StringWrapper} from 'angular2/src/facade/lang';
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import {Pipe} from './pipe';
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// HACK: workaround for Traceur behavior.
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// It expects all transpiled modules to contain this marker.
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// TODO: remove this when we no longer use traceur
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export var __esModule = true;
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/**
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* Implements lowercase transforms to text.
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*
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* # Example
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*
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* In this example we transform the user text lowercase.
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*
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* ```
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* @Component({
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* selector: "username-cmp"
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* })
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* @View({
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* inline: "Username: {{ user | lowercase }}"
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* })
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* class Username {
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* user:string;
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* }
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*
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* ```
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*
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* @exportedAs angular2/pipes
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*/
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export class LowerCasePipe extends Pipe {
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_latestValue: string;
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constructor() {
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super();
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this._latestValue = null;
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}
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supports(str): boolean { return isString(str); }
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onDestroy(): void { this._latestValue = null; }
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transform(value: string): string {
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if (this._latestValue !== value) {
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this._latestValue = value;
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return StringWrapper.toLowerCase(value);
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} else {
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return this._latestValue;
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}
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}
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}
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/**
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* @exportedAs angular2/pipes
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*/
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export class LowerCaseFactory {
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supports(str): boolean { return isString(str); }
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create(): Pipe { return new LowerCasePipe(); }
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}
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