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node-red/packages/node_modules/@node-red/util/lib/i18n.js
2021-01-27 23:28:19 +00:00

235 lines
6.7 KiB
JavaScript

/**
* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* @ignore
**/
/**
* Internationalization utilities
* @mixin @node-red/util_i18n
*/
var i18n = require("i18next");
var path = require("path");
var fs = require("fs-extra");
var defaultLang = "en-US";
var resourceMap = {};
var resourceCache = {};
var initPromise;
/**
* Register multiple message catalogs with i18n.
* @memberof @node-red/util_i18n
*/
function registerMessageCatalogs(catalogs) {
var promises = catalogs.map(function(catalog) {
return registerMessageCatalog(catalog.namespace,catalog.dir,catalog.file).catch(err => {});
});
return Promise.all(promises);
}
/**
* Register a message catalog with i18n.
* @memberof @node-red/util_i18n
*/
async function registerMessageCatalog(namespace,dir,file) {
return initPromise.then(function() {
return new Promise((resolve,reject) => {
resourceMap[namespace] = { basedir:dir, file:file, lngs: []};
fs.readdir(dir,function(err, files) {
if (err) {
resolve();
} else {
files.forEach(function(f) {
if (fs.existsSync(path.join(dir,f,file))) {
resourceMap[namespace].lngs.push(f);
}
});
i18n.loadNamespaces(namespace,function() {
resolve();
});
}
})
});
});
}
function mergeCatalog(fallback,catalog) {
for (var k in fallback) {
if (fallback.hasOwnProperty(k)) {
if (!catalog[k]) {
catalog[k] = fallback[k];
} else if (typeof fallback[k] === 'object') {
mergeCatalog(fallback[k],catalog[k]);
}
}
}
}
async function readFile(lng, ns) {
if (/[^a-z\-]/i.test(lng)) {
throw new Error("Invalid language: "+lng)
}
if (resourceCache[ns] && resourceCache[ns][lng]) {
return resourceCache[ns][lng];
} else if (resourceMap[ns]) {
const file = path.join(resourceMap[ns].basedir, lng, resourceMap[ns].file);
const content = await fs.readFile(file, "utf8");
resourceCache[ns] = resourceCache[ns] || {};
resourceCache[ns][lng] = JSON.parse(content.replace(/^\uFEFF/, ''));
var baseLng = lng.split('-')[0];
if (baseLng !== lng && resourceCache[ns][baseLng]) {
mergeCatalog(resourceCache[ns][baseLng], resourceCache[ns][lng]);
}
if (lng !== defaultLang) {
mergeCatalog(resourceCache[ns][defaultLang], resourceCache[ns][lng]);
}
return resourceCache[ns][lng];
} else {
throw new Error("Unrecognised namespace");
}
}
var MessageFileLoader = {
type: "backend",
init: function (services, backendOptions, i18nextOptions) { },
read: function (lng, ns, callback) {
readFile(lng, ns)
.then(data => callback(null, data))
.catch(err => {
if (/-/.test(lng)) {
// if reading language file fails -> try reading base language (e. g. 'fr' instead of 'fr-FR' or 'de' for 'de-DE')
var baseLng = lng.split('-')[0];
readFile(baseLng, ns).then(baseData => callback(null, baseData)).catch(err => callback(err));
} else {
callback(err);
}
});
}
}
function getCurrentLocale() {
var env = process.env;
for (var name of ['LC_ALL', 'LC_MESSAGES', 'LANG']) {
if (name in env) {
var val = env[name];
return val.substring(0, 2);
}
}
return undefined;
}
function init(settings) {
if (!initPromise) {
// Keep this as a 'when' promise as top-level red.js uses 'otherwise'
// and embedded users of NR may have copied that.
initPromise = new Promise((resolve,reject) => {
i18n.use(MessageFileLoader);
var opt = {
// debug: true,
defaultNS: "runtime",
ns: [],
fallbackLng: defaultLang,
interpolation: {
unescapeSuffix: 'HTML',
escapeValue: false,
prefix: '__',
suffix: '__'
}
};
var lang = settings.lang || getCurrentLocale();
if (lang) {
opt.lng = lang;
}
i18n.init(opt ,function() {
resolve();
});
});
}
}
/**
* Gets a message catalog.
* @name catalog
* @function
* @memberof @node-red/util_i18n
*/
function getCatalog(namespace,lang) {
var result = null;
lang = lang || defaultLang;
if (/[^a-z\-]/i.test(lang)) {
throw new Error("Invalid language: "+lng)
}
if (resourceCache.hasOwnProperty(namespace)) {
result = resourceCache[namespace][lang];
if (!result) {
var langParts = lang.split("-");
if (langParts.length == 2) {
result = resourceCache[namespace][langParts[0]];
}
}
}
return result;
}
/**
* Gets a list of languages a given catalog is available in.
* @name availableLanguages
* @function
* @memberof @node-red/util_i18n
*/
function availableLanguages(namespace) {
if (resourceMap.hasOwnProperty(namespace)) {
return resourceMap[namespace].lngs
}
}
var obj = module.exports = {
init: init,
registerMessageCatalog: registerMessageCatalog,
registerMessageCatalogs: registerMessageCatalogs,
catalog: getCatalog,
availableLanguages: availableLanguages,
/**
* The underlying i18n library for when direct access is really needed
*/
i: i18n,
/**
* The default language of the runtime
*/
defaultLang: defaultLang
}
/**
* Perform a message catalog lookup.
* @name _
* @function
* @memberof @node-red/util_i18n
*/
obj['_'] = function() {
//var opts = {};
//if (def) {
// opts.defaultValue = def;
//}
//console.log(arguments);
var res = i18n.t.apply(i18n,arguments);
return res;
}