4e35e348af
With #31953 we moved the factories for components, directives and pipes into a new field called `ngFactoryDef`, however I decided not to do it for injectables, because they needed some extra logic. These changes set up the `ngFactoryDef` for injectables as well. For reference, the extra logic mentioned above is that for injectables we have two code paths: 1. For injectables that don't configure how they should be instantiated, we create a `factory` that proxies to `ngFactoryDef`: ``` // Source @Injectable() class Service {} // Output class Service { static ngInjectableDef = defineInjectable({ factory: () => Service.ngFactoryFn(), }); static ngFactoryFn: (t) => new (t || Service)(); } ``` 2. For injectables that do configure how they're created, we keep the `ngFactoryDef` and generate the factory based on the metadata: ``` // Source @Injectable({ useValue: DEFAULT_IMPL, }) class Service {} // Output export class Service { static ngInjectableDef = defineInjectable({ factory: () => DEFAULT_IMPL, }); static ngFactoryFn: (t) => new (t || Service)(); } ``` PR Close #32433
54 lines
1.4 KiB
TypeScript
54 lines
1.4 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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* @ngModule CommonModule
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* @description
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*
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* Generic selector that displays the string that matches the current value.
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*
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* If none of the keys of the `mapping` match the `value`, then the content
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* of the `other` key is returned when present, otherwise an empty string is returned.
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*
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* @usageNotes
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*
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* ### Example
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*
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* {@example common/pipes/ts/i18n_pipe.ts region='I18nSelectPipeComponent'}
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*
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* @publicApi
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*/
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@Pipe({name: 'i18nSelect', pure: true})
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export class I18nSelectPipe implements PipeTransform {
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/**
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* @param value a string to be internationalized.
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* @param mapping an object that indicates the text that should be displayed
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* for different values of the provided `value`.
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*/
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transform(value: string|null|undefined, mapping: {[key: string]: string}): string {
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if (value == null) return '';
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if (typeof mapping !== 'object' || typeof value !== 'string') {
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throw invalidPipeArgumentError(I18nSelectPipe, mapping);
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}
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if (mapping.hasOwnProperty(value)) {
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return mapping[value];
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}
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if (mapping.hasOwnProperty('other')) {
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return mapping['other'];
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}
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return '';
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}
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}
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