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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | 5x 5x 5x 5x 5x 5x 5x 12x 12x 12x 12x 12x 12x 12x 172x 172x 172x 172x 172x 172x 172x 6x 2x 2x 2x 170x 170x 3x 170x 16x 181x 6x 6x 6x 6x 6x 6x 172x 172x 52x 52x 130x 52x 52x 172x | import { Inject, Injectable, Logger, OnModuleInit } from '@nestjs/common'; import * as format from 'string-format'; import { I18N_OPTIONS, I18N_TRANSLATIONS, I18N_LANGUAGES, I18N_LANGUAGES_SUBJECT, I18N_TRANSLATIONS_SUBJECT, } from '../i18n.constants'; import { I18nOptions } from '..'; import { I18nTranslation } from '../interfaces/i18n-translation.interface'; import * as _ from 'lodash'; import { Observable, BehaviorSubject } from 'rxjs'; import { I18nParser } from '../parsers/i18n.parser'; import { take } from 'rxjs/operators'; export type translateOptions = { lang?: string; args?: ({ [k: string]: any } | string)[] | { [k: string]: any }; }; @Injectable() export class I18nService { constructor( @Inject(I18N_OPTIONS) private readonly i18nOptions: I18nOptions, @Inject(I18N_TRANSLATIONS) private readonly translations: Observable<I18nTranslation>, @Inject(I18N_LANGUAGES) private readonly supportedLanguages: Observable<string[]>, private readonly logger: Logger, private readonly parser: I18nParser, @Inject(I18N_LANGUAGES_SUBJECT) private readonly languagesSubject: BehaviorSubject<string[]>, @Inject(I18N_TRANSLATIONS_SUBJECT) private readonly translationsSubject: BehaviorSubject<I18nTranslation>, ) {} public async translate( key: string, options?: translateOptions, ): Promise<string> { options = { lang: this.i18nOptions.fallbackLanguage, ...options, }; const { args } = options; let { lang } = options; lang = lang === undefined || lang === null ? this.i18nOptions.fallbackLanguage : lang; lang = await this.handleFallbacks(lang); const translationsByLanguage = ( await this.translations.pipe(take(1)).toPromise() )[lang]; if ( translationsByLanguage === undefined || translationsByLanguage === null || (!!translationsByLanguage && !translationsByLanguage.hasOwnProperty(key)) ) { if (lang !== this.i18nOptions.fallbackLanguage) { const message = `Translation "${key}" in "${lang}" does not exist.`; this.logger.error(message); return this.translate(key, { lang: this.i18nOptions.fallbackLanguage, args, }); } } let translation = translationsByLanguage ? translationsByLanguage[key] : key; if (translation && (args || (args instanceof Array && args.length > 0))) { translation = format( translation, ...(args instanceof Array ? args || [] : [args]), ); } return translation || key; } public t(key: string, options?: translateOptions) { return this.translate(key, options); } public async getSupportedLanguages() { return this.supportedLanguages.pipe(take(1)).toPromise(); } public async refresh() { const translations = await this.parser.parse(); Iif (translations instanceof Observable) { this.translationsSubject.next( await translations.pipe(take(1)).toPromise(), ); } else { this.translationsSubject.next(translations); } const languages = await this.parser.languages(); Iif (languages instanceof Observable) { this.languagesSubject.next(await languages.pipe(take(1)).toPromise()); } else { this.languagesSubject.next(languages); } } private async handleFallbacks(lang: string) { const supportedLanguages = await this.getSupportedLanguages(); if (this.i18nOptions.fallbacks && !supportedLanguages.includes(lang)) { const sanitizedLang = lang.includes('-') ? lang.substring(0, lang.indexOf('-')).concat('-*') : lang; for (const key in this.i18nOptions.fallbacks) { if (key === lang || key === sanitizedLang) { lang = this.i18nOptions.fallbacks[key]; break; } } } return lang; } } |