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i18next.js
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i18next.js
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import baseLogger from './logger.js';
import EventEmitter from './EventEmitter.js';
import ResourceStore from './ResourceStore.js';
import Translator from './Translator.js';
import LanguageUtils from './LanguageUtils.js';
import PluralResolver from './PluralResolver.js';
import Interpolator from './Interpolator.js';
import BackendConnector from './BackendConnector.js';
import { get as getDefaults, transformOptions } from './defaults.js';
import postProcessor from './postProcessor.js';
import { defer } from './utils';
function noop() {}
class I18n extends EventEmitter {
constructor(options = {}, callback) {
super();
this.options = transformOptions(options);
this.services = {};
this.logger = baseLogger;
this.modules = { external: [] };
if (callback && !this.isInitialized && !options.isClone) {
// https://github.com/i18next/i18next/issues/879
if (!this.options.initImmediate) {
this.init(options, callback);
return this;
}
setTimeout(() => {
this.init(options, callback);
}, 0);
}
}
init(options = {}, callback) {
if (typeof options === 'function') {
callback = options;
options = {};
}
this.options = { ...getDefaults(), ...this.options, ...transformOptions(options) };
this.format = this.options.interpolation.format;
if (!callback) callback = noop;
function createClassOnDemand(ClassOrObject) {
if (!ClassOrObject) return null;
if (typeof ClassOrObject === 'function') return new ClassOrObject();
return ClassOrObject;
}
// init services
if (!this.options.isClone) {
if (this.modules.logger) {
baseLogger.init(createClassOnDemand(this.modules.logger), this.options);
} else {
baseLogger.init(null, this.options);
}
const lu = new LanguageUtils(this.options);
this.store = new ResourceStore(this.options.resources, this.options);
const s = this.services;
s.logger = baseLogger;
s.resourceStore = this.store;
s.languageUtils = lu;
s.pluralResolver = new PluralResolver(lu, { prepend: this.options.pluralSeparator, compatibilityJSON: this.options.compatibilityJSON, simplifyPluralSuffix: this.options.simplifyPluralSuffix });
s.interpolator = new Interpolator(this.options);
s.backendConnector = new BackendConnector(createClassOnDemand(this.modules.backend), s.resourceStore, s, this.options);
// pipe events from backendConnector
s.backendConnector.on('*', (event, ...args) => {
this.emit(event, ...args);
});
if (this.modules.languageDetector) {
s.languageDetector = createClassOnDemand(this.modules.languageDetector);
s.languageDetector.init(s, this.options.detection, this.options);
}
if (this.modules.i18nFormat) {
s.i18nFormat = createClassOnDemand(this.modules.i18nFormat);
if (s.i18nFormat.init) s.i18nFormat.init(this);
}
this.translator = new Translator(this.services, this.options);
// pipe events from translator
this.translator.on('*', (event, ...args) => {
this.emit(event, ...args);
});
this.modules.external.forEach((m) => {
if (m.init) m.init(this);
});
}
// append api
const storeApi = ['getResource', 'addResource', 'addResources', 'addResourceBundle', 'removeResourceBundle', 'hasResourceBundle', 'getResourceBundle', 'getDataByLanguage'];
storeApi.forEach((fcName) => {
this[fcName] = (...args) => this.store[fcName](...args);
});
const deferred = defer();
const load = () => {
this.changeLanguage(this.options.lng, (err, t) => {
this.isInitialized = true;
this.logger.log('initialized', this.options);
this.emit('initialized', this.options);
deferred.resolve(t); // not rejecting on err (as err is only a loading translation failed warning)
callback(err, t);
});
};
if (this.options.resources || !this.options.initImmediate) {
load();
} else {
setTimeout(load, 0);
}
return deferred;
}
/* eslint consistent-return: 0 */
loadResources(callback = noop) {
if (!this.options.resources || this.options.partialBundledLanguages) {
if (this.language && this.language.toLowerCase() === 'cimode') return callback(); // avoid loading resources for cimode
const toLoad = [];
const append = (lng) => {
if (!lng) return;
const lngs = this.services.languageUtils.toResolveHierarchy(lng);
lngs.forEach((l) => {
if (toLoad.indexOf(l) < 0) toLoad.push(l);
});
};
if (!this.language) {
// at least load fallbacks in this case
const fallbacks = this.services.languageUtils.getFallbackCodes(this.options.fallbackLng);
fallbacks.forEach(l => append(l));
} else {
append(this.language);
}
if (this.options.preload) {
this.options.preload.forEach(l => append(l));
}
this.services.backendConnector.load(toLoad, this.options.ns, callback);
} else {
callback(null);
}
}
reloadResources(lngs, ns, callback) {
const deferred = defer();
if (!lngs) lngs = this.languages;
if (!ns) ns = this.options.ns;
if (!callback) callback = noop;
this.services.backendConnector.reload(lngs, ns, () => {
deferred.resolve();
callback(null);
});
return deferred;
}
use(module) {
if (module.type === 'backend') {
this.modules.backend = module;
}
if (module.type === 'logger' || (module.log && module.warn && module.error)) {
this.modules.logger = module;
}
if (module.type === 'languageDetector') {
this.modules.languageDetector = module;
}
if (module.type === 'i18nFormat') {
this.modules.i18nFormat = module;
}
if (module.type === 'postProcessor') {
postProcessor.addPostProcessor(module);
}
if (module.type === '3rdParty') {
this.modules.external.push(module);
}
return this;
}
changeLanguage(lng, callback) {
const deferred = defer();
const done = (err, l) => {
this.translator.changeLanguage(l);
if (l) {
this.emit('languageChanged', l);
this.logger.log('languageChanged', l);
}
deferred.resolve((...args) => this.t(...args));
if (callback) callback(err, (...args) => this.t(...args));
};
const setLng = (l) => {
if (l) {
this.language = l;
this.languages = this.services.languageUtils.toResolveHierarchy(l);
if (!this.translator.language) this.translator.changeLanguage(l);
if (this.services.languageDetector) this.services.languageDetector.cacheUserLanguage(l);
}
this.loadResources((err) => {
done(err, l);
});
};
if (!lng && this.services.languageDetector && !this.services.languageDetector.async) {
setLng(this.services.languageDetector.detect());
} else if (!lng && this.services.languageDetector && this.services.languageDetector.async) {
this.services.languageDetector.detect(setLng);
} else {
setLng(lng);
}
return deferred;
}
getFixedT(lng, ns) {
const fixedT = (key, opts, ...rest) => {
let options = { ...opts };
if (typeof opts !== 'object') {
options = this.options.overloadTranslationOptionHandler([key, opts].concat(rest));
}
options.lng = options.lng || fixedT.lng;
options.lngs = options.lngs || fixedT.lngs;
options.ns = options.ns || fixedT.ns;
return this.t(key, options);
};
if (typeof lng === 'string') {
fixedT.lng = lng;
} else {
fixedT.lngs = lng;
}
fixedT.ns = ns;
return fixedT;
}
t(...args) {
return this.translator && this.translator.translate(...args);
}
exists(...args) {
return this.translator && this.translator.exists(...args);
}
setDefaultNamespace(ns) {
this.options.defaultNS = ns;
}
loadNamespaces(ns, callback) {
const deferred = defer();
if (!this.options.ns) {
callback && callback();
return Promise.resolve();
}
if (typeof ns === 'string') ns = [ns];
ns.forEach((n) => {
if (this.options.ns.indexOf(n) < 0) this.options.ns.push(n);
});
this.loadResources((err) => {
deferred.resolve();
if (callback) callback(err);
});
return deferred;
}
loadLanguages(lngs, callback) {
const deferred = defer();
if (typeof lngs === 'string') lngs = [lngs];
const preloaded = this.options.preload || [];
const newLngs = lngs.filter(lng => preloaded.indexOf(lng) < 0);
// Exit early if all given languages are already preloaded
if (!newLngs.length) {
if (callback) callback();
return Promise.resolve();
}
this.options.preload = preloaded.concat(newLngs);
this.loadResources((err) => {
deferred.resolve();
if (callback) callback(err);
});
return deferred;
}
dir(lng) {
if (!lng) lng = this.languages && this.languages.length > 0 ? this.languages[0] : this.language;
if (!lng) return 'rtl';
const rtlLngs = ['ar', 'shu', 'sqr', 'ssh', 'xaa', 'yhd', 'yud', 'aao', 'abh', 'abv', 'acm',
'acq', 'acw', 'acx', 'acy', 'adf', 'ads', 'aeb', 'aec', 'afb', 'ajp', 'apc', 'apd', 'arb',
'arq', 'ars', 'ary', 'arz', 'auz', 'avl', 'ayh', 'ayl', 'ayn', 'ayp', 'bbz', 'pga', 'he',
'iw', 'ps', 'pbt', 'pbu', 'pst', 'prp', 'prd', 'ur', 'ydd', 'yds', 'yih', 'ji', 'yi', 'hbo',
'men', 'xmn', 'fa', 'jpr', 'peo', 'pes', 'prs', 'dv', 'sam'
];
return rtlLngs.indexOf(this.services.languageUtils.getLanguagePartFromCode(lng)) >= 0 ? 'rtl' : 'ltr';
}
/* eslint class-methods-use-this: 0 */
createInstance(options = {}, callback) {
return new I18n(options, callback);
}
cloneInstance(options = {}, callback = noop) {
const mergedOptions = { ...this.options, ...options, ...{ isClone: true } };
const clone = new I18n(mergedOptions);
const membersToCopy = ['store', 'services', 'language'];
membersToCopy.forEach((m) => {
clone[m] = this[m];
});
clone.translator = new Translator(clone.services, clone.options);
clone.translator.on('*', (event, ...args) => {
clone.emit(event, ...args);
});
clone.init(mergedOptions, callback);
clone.translator.options = clone.options; // sync options
return clone;
}
}
export default new I18n();