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‎app-express.js‎

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var express = require('express');
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var app = express();
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app.get('/', function(req, res){
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res.send('Hello World');
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});
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app.listen(3000);
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console.log('Server running at http://127.0.0.1:3000/');

‎app-localized.js‎

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var express = require( "express" ),
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nunjucks = require( "nunjucks" ),
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path = require( "path" ),
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i18n = require( "./lib/i18n.js" ),
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app = express(),
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nunjucksEnv = new nunjucks.Environment( new nunjucks.FileSystemLoader( path.join( __dirname, '/public' )));
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nunjucksEnv.express( app );
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// Setup locales with i18n
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app.use( i18n.abide({
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supported_languages: [
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"en_US", "th_TH"
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],
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default_lang: "en_US",
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translation_directory: "locale",
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localeOnUrl: true
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}));
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app.get('/', function(req, res){
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res.render( "localized.html" );
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});
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app.listen(3000);
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console.log('Server running at http://127.0.0.1:3000/');

‎app-normal.js‎

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var http = require('http');
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http.createServer(function (req, res) {
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res.writeHead(200, {'Content-Type': 'text/plain'});
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res.end('Hello World\n');
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}).listen(8000);
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console.log('Server running at http://127.0.0.1:8000/');

‎app-render.js‎

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var express = require( "express" ),
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nunjucks = require( "nunjucks" ),
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path = require( "path" ),
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app = express(),
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nunjucksEnv = new nunjucks.Environment( new nunjucks.FileSystemLoader( path.join( __dirname, '/public' )));
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nunjucksEnv.express( app );
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app.get('/', function(req, res){
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res.render( "nunjucks.html", { helloworld: "Hello World"});
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});
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app.listen(3000);
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console.log('Server running at http://127.0.0.1:3000/');

‎app-static.js‎

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var express = require('express');
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var app = express();
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app.use(express.static(__dirname + '/public'));
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app.listen(3000);
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console.log('Server running at http://127.0.0.1:3000/');

‎lib/i18n.js‎

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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* i18n-abide
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*
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* This module abides by the user's language preferences and makes it
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* available throughout the app.
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*
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* This module abides by the Mozilla L10n way of doing things.
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*
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* The module abides.
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*
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* See docs/I18N.md for details.
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*/
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var fs = require('fs'),
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gobbledygook = require('gobbledygook'),
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plist = require('plist'),
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path = require('path'),
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util = require('util');
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const DAVID_B_LABYRN = 'db-LB';
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const BIDI_RTL_LANGS = ['ar', DAVID_B_LABYRN, 'fa', 'he'];
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// Number of characters before and after valid JSON in messages.json files
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const JS_PRE_LEN = 24;
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const JS_POST_LEN = 3;
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var translations = {},
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logger;
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// forward references
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var localeFrom, parseAcceptLanguage, bestLanguage, format;
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/**
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* Connect middleware which is i18n aware.
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*
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* Usage:
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app.use(i18n.abide({
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supported_languages: ['en-US', 'fr', 'pl'],
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default_lang: 'en-US',
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translation_directory: 'locale'
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}));
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*
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* Other valid options: gettext_alias, debug_lang, disable_locale_check,
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* or logger
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*/
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exports.abide = function(options) {
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options = options || {};
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options.gettext_alias = options.gettext_alias || 'gettext';
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options.supported_languages = options.supported_languages || [ 'en-US' ];
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options.default_lang = options.default_lang || 'en-US';
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options.debug_lang = options.debug_lang || 'it-CH';
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options.disable_locale_check = options.disable_locale_check === true;
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options.translation_directory = options.translation_directory || 'locale';
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options.localeOnUrl = options.localeOnUrl === true;
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options.logger = options.logger || console;
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logger = options.logger;
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var existsSync = fs.existsSync || path.existsSync,
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debug_locale = localeFrom(options.debug_lang);
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function resolveLocalePath(locale) {
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return path.resolve(path.join(__dirname, '..'),
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options.translation_directory,
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locale + '.plist');
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}
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options.supported_languages.forEach(function(lang, i) {
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var l = localeFrom(lang);
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// populate the in-memory translation cache with client.json, which contains
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// strings relevant on the server
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try {
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translations[l] = plist.parseFileSync(resolveLocalePath(l));
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} catch (e) {
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// an exception here means that there was a problem with the translation
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// files for this locale!
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if (options.default_lang === lang || options.debug_lang === lang) return;
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var msg = util.format(
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'Bad locale=[%s] missing .plist file in [%s]. See locale/README (%s)',
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l, resolveLocalePath(l), e);
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if (!options.disable_locale_check) {
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logger.warn(msg);
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} else {
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logger.error(msg);
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throw msg;
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}
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}
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});
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function checkUrlLocale( req ) {
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if (!options.localeOnUrl) {
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return;
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}
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// Look for /en/ or /en-US/ or /en_US/ on the URL
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var matches = req.url.match( /^\/([a-zA-Z]{2,3}([-_][a-zA-Z]{2})?)(\/|$)/ );
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// Swap out the accept-language so that we respect what the user
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// used on the URL, and strip the extra locale info from the URL
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// so our routes still work.
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if ( matches ) {
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req.url = req.url.replace( matches[ 0 ], '/' );
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// Normalize use of dash to underscore internally
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req.headers[ 'accept-language' ] = matches[ 1 ].replace( '-', '_' );
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}
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}
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return function(req, resp, next) {
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checkUrlLocale( req );
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var langs = parseAcceptLanguage(req.headers['accept-language']),
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lang_dir,
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lang = bestLanguage(langs, options.supported_languages,
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options.default_lang),
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debug_lang = options.debug_lang.toLowerCase(),
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locale,
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locals = {},
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gt;
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if (lang && lang.toLowerCase && lang.toLowerCase() === debug_lang) {
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// What? http://www.youtube.com/watch?v=rJLnGjhPT1Q
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lang = DAVID_B_LABYRN;
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}
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// Express 2 support
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if (!! resp.local) {
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resp.locals = function(args, orValue) {
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if ('string' === typeof args) {
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resp.local(args, orValue);
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} else {
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Object.keys(args).forEach(function(key, i) {
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resp.local(key, args[key]);
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});
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}
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};
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}
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locals.lang = lang;
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// BIDI support, which direction does text flow?
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lang_dir = BIDI_RTL_LANGS.indexOf(lang) >= 0 ? 'rtl' : 'ltr';
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locals.lang_dir = lang_dir;
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req.lang = lang;
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locale = localeFrom(lang);
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locals.locale = locale;
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req.locale = locale;
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locals.format = format;
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req.format = format;
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if (lang.toLowerCase() === DAVID_B_LABYRN.toLowerCase()) {
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gt = gobbledygook;
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locals.lang = DAVID_B_LABYRN;
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} else if (translations[locale]) {
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gt = function(sid) {
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if (translations[locale][sid] && translations[locale][sid].length) {
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return translations[locale][sid];
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}
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// If we didn't find it, use the default lang's string
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var defaultLocale = options.default_lang;
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if (translations[defaultLocale][sid] && translations[defaultLocale][sid].length) {
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return translations[defaultLocale][sid];
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}
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// Otherwise just return the string key
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return sid;
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};
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} else {
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// default lang in a non gettext environment... fake it
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gt = function(a, b) { return a; };
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}
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locals[options.gettext_alias] = gt;
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req.gettext = gt;
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// resp.locals(string, value) doesn't seem to work with EJS
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resp.locals(locals);
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next();
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};
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};
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function qualityCmp(a, b) {
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if (a.quality === b.quality) {
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return 0;
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} else if (a.quality < b.quality) {
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return 1;
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} else {
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return -1;
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}
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}
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/**
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* Parses the HTTP accept-language header and returns a
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* sorted array of objects. Example object:
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* {
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* lang: 'pl', quality: 0.7
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* }
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*/
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exports.parseAcceptLanguage = parseAcceptLanguage = function(header) {
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// pl,fr-FR;q=0.3,en-US;q=0.1
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if (! header || ! header.split) {
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return [];
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}
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var raw_langs = header.split(',');
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var langs = raw_langs.map(function(raw_lang) {
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var parts = raw_lang.split(';');
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var q = 1;
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if (parts.length > 1 && parts[1].indexOf('q=') === 0) {
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var qval = parseFloat(parts[1].split('=')[1]);
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if (isNaN(qval) === false) {
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q = qval;
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}
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}
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return { lang: parts[0].trim(), quality: q };
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});
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langs.sort(qualityCmp);
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return langs;
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};
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// Given the user's prefered languages and a list of currently
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// supported languages, returns the best match or a default language.
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//
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// languages must be a sorted list, the first match is returned.
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exports.bestLanguage = bestLanguage = function(languages, supported_languages, defaultLanguage) {
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var lower = supported_languages.map(function(l) { return l.toLowerCase(); });
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for(var i=0; i < languages.length; i++) {
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var lq = languages[i];
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if (lower.indexOf(lq.lang.toLowerCase()) !== -1) {
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return lq.lang;
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// Issue#1128 match locale, even if region isn't supported
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} else if (lower.indexOf(lq.lang.split('-')[0].toLowerCase()) !== -1) {
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return lq.lang.split('-')[0];
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}
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}
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return defaultLanguage;
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};
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/**
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* Given a language code, return a locale code the OS understands.
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*
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* language: en-US
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* locale: en_US
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*/
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exports.localeFrom = localeFrom = function(language) {
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if (! language || ! language.split) {
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return "";
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}
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var parts = language.split('-');
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if (parts.length === 1) {
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return parts[0].toLowerCase();
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} else if (parts.length === 2) {
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return util.format('%s_%s', parts[0].toLowerCase(), parts[1].toUpperCase());
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} else if (parts.length === 3) {
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// sr-Cyrl-RS should be sr_RS
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return util.format('%s_%s', parts[0].toLowerCase(), parts[2].toUpperCase());
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} else {
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logger.error(
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util.format("Unable to map a local from language code [%s]", language));
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return language;
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}
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};
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/**
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* Given a locale code, return a language code
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*/
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exports.languageFrom = function(locale) {
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if (!locale || !locale.split) {
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return "";
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}
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var parts = locale.split('_');
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if (parts.length === 1) {
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return parts[0].toLowerCase();
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} else if (parts.length === 2) {
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return util.format('%s-%s', parts[0].toLowerCase(), parts[1].toUpperCase());
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} else if (parts.length === 3) {
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// sr_RS should be sr-RS
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return util.format('%s-%s', parts[0].toLowerCase(), parts[2].toUpperCase());
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} else {
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logger.error(
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util.format("Unable to map a language from locale code [%s]", locale));
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return locale;
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}
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};
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/**
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* format provides string interpolation on the client and server side.
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* It can be used with either an object for named variables, or an array
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* of values for positional replacement.
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*
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* Named Example:
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* format("%(salutation)s %(place)s", {salutation: "Hello", place: "World"}, true);
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* Positional Example:
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* format("%s %s", ["Hello", "World"]);
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*/
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exports.format = format = function(fmt, obj, named) {
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if (!fmt) return "";
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if (Array.isArray(obj) || named === false) {
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return fmt.replace(/%s/g, function(){return String(obj.shift());});
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} else if (typeof obj === 'object' || named === true) {
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return fmt.replace(/%\(\s*([^)]+)\s*\)s/g, function(m, v){
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return String(obj[v.trim()]);
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});
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} else {
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return fmt;
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}
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};
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exports.getStrings = function( locale ) {
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return translations[ locale.toLowerCase() ];
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};
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exports.getLocales = function() {
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return Object.keys( translations );
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};

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