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* Coherent.js Translator
*
* Handles translation of strings with interpolation and pluralization
*
* @module i18n/translator
*/
/**
* Translator
* Manages translations and locale switching
*/
export class Translator {
constructor(options = {}) {
this.options = {
defaultLocale: 'en',
fallbackLocale: 'en',
missingKeyHandler: null,
interpolation: {
prefix: '{{',
suffix: '}}'
},
...options
};
this.translations = new Map();
this.currentLocale = this.options.defaultLocale;
this.loadedLocales = new Set();
}
/**
* Add translations for a locale
*
* @param {string} locale - Locale code (e.g., 'en', 'fr', 'es')
* @param {Object} translations - Translation object
*/
addTranslations(locale, translations) {
if (!this.translations.has(locale)) {
this.translations.set(locale, {});
}
const existing = this.translations.get(locale);
this.translations.set(locale, this.deepMerge(existing, translations));
this.loadedLocales.add(locale);
}
/**
* Deep merge objects
*/
deepMerge(target, source) {
const result = { ...target };
for (const [key, value] of Object.entries(source)) {
if (value && typeof value === 'object' && !Array.isArray(value)) {
result[key] = this.deepMerge(result[key] || {}, value);
} else {
result[key] = value;
}
}
return result;
}
/**
* Set current locale
*
* @param {string} locale - Locale code
*/
setLocale(locale) {
if (!this.loadedLocales.has(locale)) {
console.warn(`Locale ${locale} not loaded, using fallback`);
this.currentLocale = this.options.fallbackLocale;
} else {
this.currentLocale = locale;
}
}
/**
* Get current locale
*
* @returns {string} Current locale code
*/
getLocale() {
return this.currentLocale;
}
/**
* Translate a key
*
* @param {string} key - Translation key (supports dot notation)
* @param {Object} [params] - Interpolation parameters
* @param {string} [locale] - Override locale
* @returns {string} Translated string
*/
t(key, params = {}, locale = null) {
const targetLocale = locale || this.currentLocale;
// Get translation
let translation = this.getTranslation(key, targetLocale);
// Fallback to default locale
Iif (translation === null && targetLocale !== this.options.fallbackLocale) {
translation = this.getTranslation(key, this.options.fallbackLocale);
}
// Handle missing translation
if (translation === null) {
Iif (this.options.missingKeyHandler) {
return this.options.missingKeyHandler(key, targetLocale);
}
return key;
}
// Handle pluralization
if (typeof translation === 'object' && params.count !== undefined) {
translation = this.selectPlural(translation, params.count, targetLocale);
}
// Interpolate parameters
Eif (typeof translation === 'string') {
return this.interpolate(translation, params);
}
return String(translation);
}
/**
* Get translation from nested object
*/
getTranslation(key, locale) {
const translations = this.translations.get(locale);
Iif (!translations) return null;
const keys = key.split('.');
let value = translations;
for (const k of keys) {
if (value && typeof value === 'object' && k in value) {
value = value[k];
} else {
return null;
}
}
return value;
}
/**
* Select plural form
*/
selectPlural(pluralObject, count, locale) {
// Check for explicit zero first (takes precedence over Intl rules)
if (count === 0 && pluralObject.zero) {
return pluralObject.zero;
}
// Use Intl.PluralRules for locale-specific pluralization
Eif (typeof Intl !== 'undefined' && Intl.PluralRules) {
const rules = new Intl.PluralRules(locale);
const rule = rules.select(count);
Eif (pluralObject[rule]) {
return pluralObject[rule];
}
}
// Fallback to simple rules
if (count === 1 && pluralObject.one) {
return pluralObject.one;
} else if (pluralObject.other) {
return pluralObject.other;
}
return pluralObject.one || pluralObject.other || '';
}
/**
* Interpolate parameters into string
*/
interpolate(str, params) {
const { prefix, suffix } = this.options.interpolation;
let result = str;
for (const [key, value] of Object.entries(params)) {
const placeholder = `${prefix}${key}${suffix}`;
result = result.replace(new RegExp(placeholder, 'g'), String(value));
}
return result;
}
/**
* Check if translation exists
*
* @param {string} key - Translation key
* @param {string} [locale] - Locale to check
* @returns {boolean} True if translation exists
*/
has(key, locale = null) {
const targetLocale = locale || this.currentLocale;
return this.getTranslation(key, targetLocale) !== null;
}
/**
* Get all translations for current locale
*
* @returns {Object} All translations
*/
getTranslations(locale = null) {
const targetLocale = locale || this.currentLocale;
return this.translations.get(targetLocale) || {};
}
/**
* Get all loaded locales
*
* @returns {Array<string>} Array of locale codes
*/
getLoadedLocales() {
return Array.from(this.loadedLocales);
}
/**
* Remove translations for a locale
*
* @param {string} locale - Locale code
*/
removeLocale(locale) {
this.translations.delete(locale);
this.loadedLocales.delete(locale);
Iif (this.currentLocale === locale) {
this.currentLocale = this.options.defaultLocale;
}
}
/**
* Clear all translations
*/
clear() {
this.translations.clear();
this.loadedLocales.clear();
this.currentLocale = this.options.defaultLocale;
}
}
/**
* Create a translator instance
*
* @param {Object} [options] - Translator options
* @returns {Translator} Translator instance
*/
export function createTranslator(options = {}) {
return new Translator(options);
}
/**
* Create a scoped translator
* Automatically prefixes all keys with a namespace
*
* @param {Translator} translator - Base translator
* @param {string} namespace - Namespace prefix
* @returns {Object} Scoped translator
*/
export function createScopedTranslator(translator, namespace) {
return {
t: (key, params, locale) => {
return translator.t(`${namespace}.${key}`, params, locale);
},
has: (key, locale) => {
return translator.has(`${namespace}.${key}`, locale);
},
getLocale: () => translator.getLocale(),
setLocale: (locale) => translator.setLocale(locale)
};
}
export default {
Translator,
createTranslator,
createScopedTranslator
};
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