37 lines
998 B
TypeScript
37 lines
998 B
TypeScript
/**
|
|
* @license
|
|
* Copyright Google Inc. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by an MIT-style license that can be
|
|
* found in the LICENSE file at https://angular.io/license
|
|
*/
|
|
|
|
import {Pipe, PipeTransform} from '@angular/core';
|
|
import {isBlank} from '../facade/lang';
|
|
import {InvalidPipeArgumentError} from './invalid_pipe_argument_error';
|
|
|
|
/**
|
|
* @ngModule CommonModule
|
|
* @whatItDoes Transforms string to uppercase.
|
|
* @howToUse `expression | uppercase`
|
|
* @description
|
|
*
|
|
* Converts value into an uppercase string using `String.prototype.toUpperCase()`.
|
|
*
|
|
* ### Example
|
|
*
|
|
* {@example common/pipes/ts/lowerupper_pipe.ts region='LowerUpperPipe'}
|
|
*
|
|
* @stable
|
|
*/
|
|
@Pipe({name: 'uppercase'})
|
|
export class UpperCasePipe implements PipeTransform {
|
|
transform(value: string): string {
|
|
if (isBlank(value)) return value;
|
|
if (typeof value !== 'string') {
|
|
throw new InvalidPipeArgumentError(UpperCasePipe, value);
|
|
}
|
|
return value.toUpperCase();
|
|
}
|
|
}
|