24 lines
703 B
TypeScript
24 lines
703 B
TypeScript
import {Injectable, PipeTransform, WrappedValue, Pipe} from '@angular/core';
|
|
import {isString, isBlank} from '../../src/facade/lang';
|
|
import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
|
|
|
|
/**
|
|
* Transforms text to lowercase.
|
|
*
|
|
* ### Example
|
|
*
|
|
* {@example core/pipes/ts/lowerupper_pipe/lowerupper_pipe_example.ts region='LowerUpperPipe'}
|
|
*/
|
|
/* @ts2dart_const */
|
|
@Pipe({name: 'lowercase'})
|
|
@Injectable()
|
|
export class LowerCasePipe implements PipeTransform {
|
|
transform(value: string): string {
|
|
if (isBlank(value)) return value;
|
|
if (!isString(value)) {
|
|
throw new InvalidPipeArgumentException(LowerCasePipe, value);
|
|
}
|
|
return value.toLowerCase();
|
|
}
|
|
}
|