62 lines
1.5 KiB
TypeScript
62 lines
1.5 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Pipe, PipeTransform} from '@angular/core';
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import {InvalidPipeArgumentError} from './invalid_pipe_argument_error';
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/**
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* Transforms text to lowercase.
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*
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* {@example core/pipes/ts/lowerupper_pipe/lowerupper_pipe_example.ts region='LowerUpperPipe' }
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*
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* @stable
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*/
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@Pipe({name: 'lowercase'})
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export class LowerCasePipe implements PipeTransform {
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transform(value: string): string {
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if (!value) return value;
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if (typeof value !== 'string') {
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throw new InvalidPipeArgumentError(LowerCasePipe, value);
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}
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return value.toLowerCase();
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}
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}
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/**
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* Transforms text to titlecase.
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*
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* @stable
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*/
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@Pipe({name: 'titlecase'})
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export class TitleCasePipe implements PipeTransform {
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transform(value: string): string {
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if (!value) return value;
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if (typeof value !== 'string') {
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throw new InvalidPipeArgumentError(TitleCasePipe, value);
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}
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return value[0].toUpperCase() + value.substr(1).toLowerCase();
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}
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}
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/**
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* Transforms text to uppercase.
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*
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* @stable
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*/
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@Pipe({name: 'uppercase'})
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export class UpperCasePipe implements PipeTransform {
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transform(value: string): string {
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if (!value) return value;
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if (typeof value !== 'string') {
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throw new InvalidPipeArgumentError(UpperCasePipe, value);
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}
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return value.toUpperCase();
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}
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}
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