57 lines
2.0 KiB
TypeScript
57 lines
2.0 KiB
TypeScript
import { TranslateLoader } from '@ngx-translate/core';
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import { HttpClient } from '@angular/common/http';
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import { map } from 'rxjs/operators/';
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import { Observable } from 'rxjs';
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/**
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* Translation loader that replaces empty strings with nothing.
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*
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* ngx-translate-extract writes empty strings into json files.
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* The problem is that these empty strings don't trigger
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* the MissingTranslationHandler - they are simply empty strings...
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*
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*/
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export class PruningTranslationLoader implements TranslateLoader {
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/**
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* Constructor to load the HttpClient
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*
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* @param http httpClient to load the translation files.
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* @param prefix Path to the language files. Can be adjusted of needed
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* @param suffix Suffix of the translation files. Usually '.json'.
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*/
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public constructor(
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private http: HttpClient,
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private prefix: string = '/assets/i18n/',
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private suffix: string = '.json'
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) {}
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/**
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* Loads a language file, stores the content, give it to the process function.
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* @param lang language string (en, fr, de, ...)
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*/
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public getTranslation(lang: string): Observable<any> {
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return this.http.get(`${this.prefix}${lang}${this.suffix}`).pipe(map((res: Object) => this.process(res)));
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}
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/**
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* Prevent to display empty strings as a translation.
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* Falls back to the default language or simply copy the content of the key.
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* @param any the content of any language file.
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*/
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private process(object: any): any {
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const newObject = {};
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for (const key in object) {
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if (object.hasOwnProperty(key)) {
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if (typeof object[key] === 'object') {
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newObject[key] = this.process(object[key]);
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} else if (typeof object[key] === 'string' && object[key] === '') {
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// do not copy empty strings
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} else {
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newObject[key] = object[key];
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}
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}
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}
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return newObject;
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}
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}
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