mirror of https://github.com/TryGhost/Ghost.git
116 lines
3.8 KiB
JavaScript
116 lines
3.8 KiB
JavaScript
const errors = require('@tryghost/errors');
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const {i18n, events} = require('../../../server/lib/common');
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const logging = require('../../../shared/logging');
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const settingsCache = require('../../../server/services/settings/cache');
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const config = require('../../../shared/config');
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const jp = require('jsonpath');
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const isNil = require('lodash/isNil');
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class ThemeI18n extends i18n.I18n {
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constructor(locale) {
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super(locale);
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}
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/**
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* Setup i18n support for themes:
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* - Load correct language file into memory
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*/
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init() {
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// This function is called during theme initialization, and when switching language or theme.
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const currentLocale = this._loadLocale();
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const activeTheme = settingsCache.get('active_theme');
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// Reading file for current locale and active theme and keeping its content in memory
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if (activeTheme) {
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// Reading translation file for theme .hbs templates.
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// Compatibility with both old themes and i18n-capable themes.
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// Preventing missing files.
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this._strings = this._tryGetLocale(activeTheme, currentLocale);
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if (!this._strings && currentLocale !== this.defaultLocale()) {
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logging.warn(`Falling back to locales/${this.defaultLocale()}.json.`);
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this._strings = this._tryGetLocale(activeTheme, this.defaultLocale());
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}
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}
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if (isNil(this._strings)) {
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// even if empty, themeStrings must be an object for jp.value
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this._strings = {};
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}
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this._initializeIntl();
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}
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/**
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* Attempt to load a local file and parse the contents
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*
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* @param {String} activeTheme
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* @param {String} locale
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*/
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_tryGetLocale(activeTheme, locale) {
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try {
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return this._readStringsFile(config.getContentPath('themes'), activeTheme, 'locales', `${locale}.json`);
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} catch (err) {
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if (err.code === 'ENOENT') {
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if (locale !== this.defaultLocale()) {
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logging.warn(`Theme's file locales/${locale}.json not found.`);
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}
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} else if (err instanceof SyntaxError) {
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logging.error(new errors.IncorrectUsageError({
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err,
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message: `Unable to parse locales/${locale}.json. Please check that it is valid JSON.`
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}));
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} else {
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throw err;
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}
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}
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}
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/**
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* Load the current locale out of the settings cache
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*/
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_loadLocale() {
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this._locale = settingsCache.get('default_locale');
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return this._locale;
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}
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/**
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* Do the lookup with JSON path
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*
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* @param {String} msgPath
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*/
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_getCandidateString(msgPath) {
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// Both jsonpath's dot-notation and bracket-notation start with '$'
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// E.g.: $.store.book.title or $['store']['book']['title']
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// The {{t}} translation helper passes the default English text
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// The full Unicode jsonpath with '$' is built here
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// jp.stringify and jp.value are jsonpath methods
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// Info: https://www.npmjs.com/package/jsonpath
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let path = jp.stringify(['$', msgPath]);
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return jp.value(this._strings, path) || msgPath;
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}
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}
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let themeI18n = new ThemeI18n();
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// /**
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// * When active theme changes, we reload theme translations
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// * We listen on the service event, because of the following known case:
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// * 1. you override a theme, which is already active
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// * 2. The data has not changed, no event is triggered.
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// */
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events.on('services.themes.activated', function () {
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themeI18n.init();
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});
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/**
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* When locale changes, we reload theme translations
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*/
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events.on('settings.default_locale.edited', function () {
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themeI18n.init();
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});
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module.exports = themeI18n;
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