48 lines
1.1 KiB
TypeScript
48 lines
1.1 KiB
TypeScript
import {isString, StringWrapper, CONST} from 'angular2/src/facade/lang';
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import {Pipe, PipeFactory} from './pipe';
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import {ChangeDetectorRef} from '../change_detector_ref';
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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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* template: "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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export class LowerCasePipe implements Pipe {
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_latestValue: string = null;
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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, args: List<any> = null): 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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@CONST()
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export class LowerCaseFactory implements PipeFactory {
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supports(str): boolean { return isString(str); }
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create(cdRef: ChangeDetectorRef): Pipe { return new LowerCasePipe(); }
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}
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