c33fda2607
Subclassing errors is problematic since Error returns a new instance. All of the patching which we do than prevent proper application of source maps. PR Close #14160
73 lines
1.7 KiB
TypeScript
73 lines
1.7 KiB
TypeScript
/**
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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 common/pipes/ts/lowerupper_pipe.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 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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* Helper method to transform a single word to titlecase.
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*
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* @stable
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*/
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function titleCaseWord(word: string) {
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if (!word) return word;
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return word[0].toUpperCase() + word.substr(1).toLowerCase();
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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 invalidPipeArgumentError(TitleCasePipe, value);
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}
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return value.split(/\b/g).map(word => titleCaseWord(word)).join('');
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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 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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