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index.js
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index.js
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var http = require('http');
function defaultCallback(err) {
if (err) {
throw err;
}
}
function runCallback(err, callback) {
setTimeout(function() { (callback || defaultCallback)(err, exports); }, 0);
return typeof err == 'undefined';
}
exports.load = function load(catalogue, locales, callback) {
if (typeof callback == 'undefined') {
callback = locales;
locales = undefined;
}
if (typeof callback == 'undefined') {
callback = catalogue;
catalogue = undefined;
}
this.store.load(catalogue || this.defaultCatalogue, locales || this.availableLocales, this, callback);
};
exports.enableForApp = function enableForApp(app, options, callback) {
if (typeof options == 'undefined') {
options = {};
}
// Load i18n data
this.load(options.catalogue || this.defaultCatalogue, options.locales, function(err, i18n) {
if (err) {
return callback(err, i18n);
}
var defaultLocale = options.locale || i18n.defaultLocale;
// Add helpers
app.dynamicHelpers(i18n.dynamicHelpers);
// Add "req.locales()"
http.IncomingMessage.prototype.locales = function() {
var accept = this.headers['accept-language'];
if (!accept) {
return [];
}
accept = accept.split(',');
var cultures = [];
for (var i=0; i<accept.length; i++) {
var pref = accept[i].split(';');
cultures.push({
"name": pref[0],
"q": parseFloat((pref[1]||'q=1').substring(2))
});
}
cultures.sort(function(a,b) { return a.q>b.q ? -1 : (a.q<b.q ? +1 : 0); });
return cultures.map(function(c) { return c.name; });
};
// Add "req.locale([locale])" based on session
http.IncomingMessage.prototype.locale = function(newValue) {
var current = this.session[module.exports.localeSessKey];
if (typeof newValue != 'undefined') {
this.session[module.exports.localeSessKey] = newValue;
}
if (typeof current == 'undefined' && typeof defaultLocale != 'undefined') {
current = defaultLocale;
}
return current;
};
// Add "req.i18n.translate(...)" and "req.i18n.plural(...)"
http.IncomingMessage.prototype.i18n = {
"translate": exports.translate.bind(exports),
"plural": exports.plural.bind(exports)
};
return callback(undefined, i18n);
});
};
exports.localeSessKey = 'locale';
exports.store = require('./stores/module');
exports.pluralHandler = require('./plural-form');
exports.defaultLocale = 'en';
exports.defaultCatalogue = 'messages';
exports.replaceFormat = '{...}';
exports.defaultPluralReplace = 'n';
exports.availableLocales = undefined; // any locale available in store
exports.setStore = function(store, config, callback) {
if (typeof config == 'function') {
var tmp = callback;
callback = config;
config = tmp;
}
try {
if (typeof store == 'string') {
this.store = require('./stores/' + store);
} else if (typeof store != 'undefined') {
this.store = store;
}
if (typeof config != 'undefined') {
return this.store.configure(config, callback || defaultCallback);
}
} catch (e) {
return (callback || defaultCallback)(e, this.store);
}
return (callback || function(){return true;})(undefined, this);
};
function replaceParams(string, replacements) {
if (typeof replacements == 'object') {
for (var key in replacements) {
string = string.replace(exports.replaceFormat.replace("...", key), replacements[key]);
}
}
return string;
}
function getTranslation(i18n, msg, locale, catalogue, context) {
var translation = i18n.store.get(msg, locale, catalogue, i18n);
// Supported results
if (typeof translation == 'function') {
// callback(context)
translation = translation(context);
} else if (typeof translation == 'object') {
// {context: translation, "": defaultTranslation}
translation = translation[context || ""] || translation[""];
} else if (typeof context != 'undefined') {
// Context requested, and translation not found, or default string translation found
var context_translation = getTranslation(i18n, context+":"+msg, locale, catalogue, undefined);
if (typeof context_translation != 'undefined') {
translation = context_translation;
}
}
return translation;
}
exports.translate = function translate(msg, params, locale, catalogue) {
if (typeof params == 'string') {
if (typeof locale != 'undefined') {
catalogue = locale;
}
locale = params;
params = undefined;
}
// Find translation
var translation = getTranslation(this, msg, locale || this.defaultLocale, catalogue || this.defaultCatalogue, params && params.context);
var translated = typeof translation != 'undefined';
// No translation found, just keep original message
if (!translated) {
translation = msg;
}
// Apply parameters
translation = replaceParams(translation, params);
// Debug ?
if (!translated && this.debugInfo) {
translation = this.debugInfo.prefix + translation + this.debugInfo.suffix;
}
return translation;
};
exports.plural = function plural(msg, number, params, locale, catalogue) {
// Debug mode ?
if (this.debugInfo) {
this.pluralHandler.debug = true;
}
if (typeof params === 'string' && typeof locale === 'undefined') {
locale = params;
params = {};
}
if (!params) {
params = {};
}
// Translate (only if all information provided, and no plural in store) ?
if (!this.store.plural && (typeof params != 'undefined' || typeof locale != 'undefined' || typeof catalogue != 'undefined')) {
msg = this.translate(msg, params, locale, catalogue);
}
// "number" can be a number (we'll replace "n" in this case), or an object like '{"count": 33}'
var paramName = this.defaultPluralReplace;
if (typeof number == 'object') {
var foundKey = null;
for (var p in number) {
if (foundKey != null) {
throw new Error('If you pass an object to plural(), it must have only ONE property.');
}
foundKey = p;
number = number[p];
}
paramName = foundKey;
}
if (isNaN(number)) {
throw new Error('plural() expects 2nd parameter to be a number.');
}
// Handle plural form
if (this.store.plural) {
// Skip generic plural forms handler, use the one embedded in store
msg = this.store.plural(msg, number, locale || this.defaultLocale, catalogue || this.defaultCatalogue);
} else {
// Use generic plural forms handler, msg must have the required format
msg = this.pluralHandler(msg, number);
}
// Replace in result
var replacements = params;
replacements[paramName] = String(number);
return replaceParams(msg, replacements);
};
exports.dynamicHelpers = {
"_": function(req) { return function(msg, params, locale, catalogue) { return req.i18n.translate(msg, params, locale || req.locale(), catalogue); }; },
"plural": function(req) { return function(msg, number, params, locale, catalogue) { return req.i18n.plural(msg, number, params, locale, catalogue); }; },
"locale": function(req) { return req.locale(); },
"locales": function(req) { return req.locales(); }
};
exports.debug = function debug(untranslatedPrefix, untranslatedSuffix) {
if (typeof untranslatedSuffix == 'undefined' && untranslatedPrefix == false) {
delete this.debugInfo;
} else {
this.debugInfo = {
"prefix": (untranslatedPrefix == true ? undefined : untranslatedPrefix) || "[T]",
"suffix": untranslatedSuffix || "[/T]"
};
}
};