/* global Intl */ var supportedLocales = ['en'], _ = require('lodash'), fs = require('fs'), chalk = require('chalk'), MessageFormat = require('intl-messageformat'), logging = require('./logging'), errors = require('./errors'), // TODO: fetch this dynamically based on overall blog settings (`key = "default_locale"`) in the `settings` table currentLocale = 'en', blos, I18n; I18n = { /** * Helper method to find and compile the given data context with a proper string resource. * * @param {string} path Path with in the JSON language file to desired string (ie: "errors.init.jsNotBuilt") * @param {object} [bindings] * @returns {string} */ t: function t(path, bindings) { var string = I18n.findString(path), msg; // If the path returns an array (as in the case with anything that has multiple paragraphs such as emails), then // loop through them and return an array of translated/formatted strings. Otherwise, just return the normal // translated/formatted string. if (_.isArray(string)) { msg = []; string.forEach(function (s) { var m = new MessageFormat(s, currentLocale); msg.push(m.format(bindings)); }); } else { msg = new MessageFormat(string, currentLocale); msg = msg.format(bindings); } return msg; }, /** * Parse JSON file for matching locale, returns string giving path. * * @param {string} msgPath Path with in the JSON language file to desired string (ie: "errors.init.jsNotBuilt") * @returns {string} */ findString: function findString(msgPath) { var matchingString, path; // no path? no string if (_.isEmpty(msgPath) || !_.isString(msgPath)) { chalk.yellow('i18n:t() - received an empty path.'); return ''; } if (blos === undefined) { I18n.init(); } matchingString = blos; path = msgPath.split('.'); path.forEach(function (key) { // reassign matching object, or set to an empty string if there is no match matchingString = matchingString[key] || {}; }); if (_.isObject(matchingString) || _.isEqual(matchingString, {})) { logging.error(new errors.IncorrectUsageError({ message: `i18n error: path "${msgPath}" was not found` })); matchingString = blos.errors.errors.anErrorOccurred; } return matchingString; }, /** * Setup i18n support: * - Load proper language file in to memory * - Polyfill node.js if it does not have Intl support or support for a particular locale */ init: function init() { // read file for current locale and keep its content in memory blos = fs.readFileSync(__dirname + '/translations/' + currentLocale + '.json'); // if translation file is not valid, you will see an error try { blos = JSON.parse(blos); } catch (err) { blos = undefined; throw err; } if (global.Intl) { // Determine if the built-in `Intl` has the locale data we need. var hasBuiltInLocaleData, IntlPolyfill; hasBuiltInLocaleData = supportedLocales.every(function (locale) { return Intl.NumberFormat.supportedLocalesOf(locale)[0] === locale && Intl.DateTimeFormat.supportedLocalesOf(locale)[0] === locale; }); if (!hasBuiltInLocaleData) { // `Intl` exists, but it doesn't have the data we need, so load the // polyfill and replace the constructors with need with the polyfill's. IntlPolyfill = require('intl'); Intl.NumberFormat = IntlPolyfill.NumberFormat; Intl.DateTimeFormat = IntlPolyfill.DateTimeFormat; } } else { // No `Intl`, so use and load the polyfill. global.Intl = require('intl'); } } }; module.exports = I18n;