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node-red/red/runtime/i18n.js

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/**
* Copyright 2015 IBM Corp.
*
* 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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var i18n = require("i18next");
var when = require("when");
var path = require("path");
var fs = require("fs");
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var defaultLang = "en-US";
var resourceMap = {};
var resourceCache = {};
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function registerMessageCatalog(namespace,dir,file) {
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return when.promise(function(resolve,reject) {
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resourceMap[namespace] = { basedir:dir, file:file};
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i18n.loadNamespace(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]);
}
}
}
}
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var MessageFileLoader = {
fetchOne: function(lng, ns, callback) {
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 init() {
return when.promise(function(resolve,reject) {
i18n.backend(MessageFileLoader);
i18n.init({
ns: {
namespaces: [],
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defaultNs: "runtime"
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},
fallbackLng: [defaultLang]
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},function() {
resolve();
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});
});
}
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function getCatalog(namespace,lang) {
var result = null;
if (resourceCache.hasOwnProperty(namespace)) {
result = resourceCache[namespace][lang];
if (!result) {
var langParts = lang.split("-");
if (langParts.length == 2) {
result = resourceCache[namespace][langParts[0]];
}
if (!result) {
return resourceCache[namespace][defaultLang];
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}
}
}
return result;
}
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var obj = module.exports = {
init: init,
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registerMessageCatalog: registerMessageCatalog,
catalog: getCatalog,
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i: i18n,
defaultLang:defaultLang
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}
obj['_'] = function() {
//var opts = {};
//if (def) {
// opts.defaultValue = def;
//}
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//console.log(arguments);
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return i18n.t.apply(null,arguments);
}