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node-red/packages/node_modules/@node-red/util/lib/i18n.js

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/**
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* 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.
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* @ignore
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**/
/**
* @module i18n
* @memberof module:@node-red/util
*/
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var i18n = require("i18next");
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var when = require("when");
var path = require("path");
var fs = require("fs");
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var defaultLang = "en-US";
var resourceMap = {};
var resourceCache = {};
var initPromise;
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/**
* Register multiple message catalogs with i18n.
* @memberof module:@node-red/util.module:i18n
*/
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function registerMessageCatalogs(catalogs) {
var promises = catalogs.map(function(catalog) {
return registerMessageCatalog(catalog.namespace,catalog.dir,catalog.file);
});
return when.settle(promises);
}
/**
* Register a message catalog with i18n.
* @memberof module:@node-red/util.module:i18n
*/
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function registerMessageCatalog(namespace,dir,file) {
return initPromise.then(function() {
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return new Promise((resolve,reject) => {
resourceMap[namespace] = { basedir:dir, file:file};
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i18n.loadNamespaces(namespace,function() {
resolve();
});
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});
});
}
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]);
}
}
}
}
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var MessageFileLoader = {
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type: "backend",
init: function(services, backendOptions, i18nextOptions) {},
read: function(lng, ns, callback) {
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if (resourceMap[ns]) {
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var file = path.join(resourceMap[ns].basedir,lng,resourceMap[ns].file);
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//console.log(file);
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fs.readFile(file,"utf8",function(err,content) {
if (err) {
callback(err);
} else {
try {
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resourceCache[ns] = resourceCache[ns]||{};
resourceCache[ns][lng] = JSON.parse(content.replace(/^\uFEFF/, ''));
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//console.log(resourceCache[ns][lng]);
if (lng !== defaultLang) {
mergeCatalog(resourceCache[ns][defaultLang],resourceCache[ns][lng]);
}
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callback(null, resourceCache[ns][lng]);
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} catch(e) {
callback(e);
}
}
});
} else {
callback(new Error("Unrecognised namespace"));
}
}
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}
function getCurrentLocale() {
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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;
}
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function init() {
if (!initPromise) {
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// Keep this as a 'when' promise as top-level red.js uses 'otherwise'
// and embedded users of NR may have copied that.
initPromise = when.promise((resolve,reject) => {
i18n.use(MessageFileLoader);
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var opt = {
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// debug: true,
defaultNS: "runtime",
ns: [],
fallbackLng: defaultLang,
interpolation: {
unescapeSuffix: 'HTML',
escapeValue: false,
prefix: '__',
suffix: '__'
}
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};
var lang = getCurrentLocale();
if (lang) {
opt.lng = lang;
}
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i18n.init(opt ,function() {
resolve();
});
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});
}
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}
/**
* Gets a message catalog.
* @name catalog
* @function
* @memberof module:@node-red/util.module:i18n
*/
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function getCatalog(namespace,lang) {
var result = null;
lang = lang || defaultLang;
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if (resourceCache.hasOwnProperty(namespace)) {
result = resourceCache[namespace][lang];
if (!result) {
var langParts = lang.split("-");
if (langParts.length == 2) {
result = resourceCache[namespace][langParts[0]];
}
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}
}
return result;
}
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var obj = module.exports = {
init: init,
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registerMessageCatalog: registerMessageCatalog,
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registerMessageCatalogs: registerMessageCatalogs,
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catalog: getCatalog,
/**
* The underlying i18n library for when direct access is really needed
*/
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i: i18n,
/**
* The default language of the runtime
*/
defaultLang: defaultLang
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}
/**
* Perform a message catalog lookup.
* @name _
* @function
* @memberof module:@node-red/util.module:i18n
*/
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obj['_'] = function() {
//var opts = {};
//if (def) {
// opts.defaultValue = def;
//}
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//console.log(arguments);
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var res = i18n.t.apply(i18n,arguments);
return res;
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}