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jquery.i18n.js
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jquery.i18n.js
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/*!
* jQuery Internationalization library
*
* Copyright (C) 2012 Santhosh Thottingal
*
* jquery.i18n is dual licensed GPLv2 or later and MIT. You don't have to do
* anything special to choose one license or the other and you don't have to
* notify anyone which license you are using. You are free to use
* UniversalLanguageSelector in commercial projects as long as the copyright
* header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
*
* @licence GNU General Public Licence 2.0 or later
* @licence MIT License
*/
( function ( $ ) {
'use strict';
var I18N,
slice = Array.prototype.slice;
/**
* @constructor
* @param {Object} options
*/
I18N = function ( options ) {
// Load defaults
this.options = $.extend( {}, I18N.defaults, options );
this.parser = this.options.parser;
this.locale = this.options.locale;
this.messageStore = this.options.messageStore;
this.languages = {};
};
I18N.prototype = {
/**
* Localize a given messageKey to a locale.
* @param {string} messageKey
* @return {string} Localized message
*/
localize: function ( messageKey ) {
var localeParts, localePartIndex, locale, fallbackIndex,
tryingLocale, message;
locale = this.locale;
fallbackIndex = 0;
while ( locale ) {
// Iterate through locales starting at most-specific until
// localization is found. As in fi-Latn-FI, fi-Latn and fi.
localeParts = locale.split( '-' );
localePartIndex = localeParts.length;
do {
tryingLocale = localeParts.slice( 0, localePartIndex ).join( '-' );
message = this.messageStore.get( tryingLocale, messageKey );
if ( message ) {
return message;
}
localePartIndex--;
} while ( localePartIndex );
if ( locale === this.options.fallbackLocale ) {
break;
}
locale = ( $.i18n.fallbacks[ this.locale ] &&
$.i18n.fallbacks[ this.locale ][ fallbackIndex ] ) ||
this.options.fallbackLocale;
$.i18n.log( 'Trying fallback locale for ' + this.locale + ': ' + locale + ' (' + messageKey + ')' );
fallbackIndex++;
}
// key not found
return '';
},
/*
* Destroy the i18n instance.
*/
destroy: function () {
$.removeData( document, 'i18n' );
},
/**
* General message loading API This can take a URL string for
* the json formatted messages. Example:
* <code>load('path/to/all_localizations.json');</code>
*
* To load a localization file for a locale:
* <code>
* load('path/to/de-messages.json', 'de' );
* </code>
*
* To load a localization file from a directory:
* <code>
* load('path/to/i18n/directory', 'de' );
* </code>
* The above method has the advantage of fallback resolution.
* ie, it will automatically load the fallback locales for de.
* For most usecases, this is the recommended method.
* It is optional to have trailing slash at end.
*
* A data object containing message key- message translation mappings
* can also be passed. Example:
* <code>
* load( { 'hello' : 'Hello' }, optionalLocale );
* </code>
*
* A source map containing key-value pair of languagename and locations
* can also be passed. Example:
* <code>
* load( {
* bn: 'i18n/bn.json',
* he: 'i18n/he.json',
* en: 'i18n/en.json'
* } )
* </code>
*
* If the data argument is null/undefined/false,
* all cached messages for the i18n instance will get reset.
*
* @param {string|Object} source
* @param {string} locale Language tag
* @return {jQuery.Promise}
*/
load: function ( source, locale ) {
var fallbackLocales, locIndex, fallbackLocale, sourceMap = {};
if ( !source && !locale ) {
source = 'i18n/' + $.i18n().locale + '.json';
locale = $.i18n().locale;
}
if ( typeof source === 'string' &&
// source extension should be json, but can have query params after that.
source.split( '?' )[ 0 ].split( '.' ).pop() !== 'json'
) {
// Load specified locale then check for fallbacks when directory is
// specified in load()
sourceMap[ locale ] = source + '/' + locale + '.json';
fallbackLocales = ( $.i18n.fallbacks[ locale ] || [] )
.concat( this.options.fallbackLocale );
for ( locIndex = 0; locIndex < fallbackLocales.length; locIndex++ ) {
fallbackLocale = fallbackLocales[ locIndex ];
sourceMap[ fallbackLocale ] = source + '/' + fallbackLocale + '.json';
}
return this.load( sourceMap );
} else {
return this.messageStore.load( source, locale );
}
},
/**
* Does parameter and magic word substitution.
*
* @param {string} key Message key
* @param {Array} parameters Message parameters
* @return {string}
*/
parse: function ( key, parameters ) {
var message = this.localize( key );
// FIXME: This changes the state of the I18N object,
// should probably not change the 'this.parser' but just
// pass it to the parser.
this.parser.language = $.i18n.languages[ $.i18n().locale ] || $.i18n.languages[ 'default' ];
if ( message === '' ) {
message = key;
}
return this.parser.parse( message, parameters );
}
};
/**
* Process a message from the $.I18N instance
* for the current document, stored in jQuery.data(document).
*
* @param {string} key Key of the message.
* @param {string} param1 [param...] Variadic list of parameters for {key}.
* @return {string|$.I18N} Parsed message, or if no key was given
* the instance of $.I18N is returned.
*/
$.i18n = function ( key, param1 ) {
var parameters,
i18n = $.data( document, 'i18n' ),
options = typeof key === 'object' && key;
// If the locale option for this call is different then the setup so far,
// update it automatically. This doesn't just change the context for this
// call but for all future call as well.
// If there is no i18n setup yet, don't do this. It will be taken care of
// by the `new I18N` construction below.
// NOTE: It should only change language for this one call.
// Then cache instances of I18N somewhere.
if ( options && options.locale && i18n && i18n.locale !== options.locale ) {
i18n.locale = options.locale;
}
if ( !i18n ) {
i18n = new I18N( options );
$.data( document, 'i18n', i18n );
}
if ( typeof key === 'string' ) {
if ( param1 !== undefined ) {
parameters = slice.call( arguments, 1 );
} else {
parameters = [];
}
return i18n.parse( key, parameters );
} else {
// FIXME: remove this feature/bug.
return i18n;
}
};
$.fn.i18n = function () {
var i18n = $.data( document, 'i18n' );
if ( !i18n ) {
i18n = new I18N();
$.data( document, 'i18n', i18n );
}
return this.each( function () {
var $this = $( this ),
messageKey = $this.data( 'i18n' ),
lBracket, rBracket, type, key;
if ( messageKey ) {
lBracket = messageKey.indexOf( '[' );
rBracket = messageKey.indexOf( ']' );
if ( lBracket !== -1 && rBracket !== -1 && lBracket < rBracket ) {
type = messageKey.slice( lBracket + 1, rBracket );
key = messageKey.slice( rBracket + 1 );
if ( type === 'html' ) {
$this.html( i18n.parse( key ) );
} else {
$this.attr( type, i18n.parse( key ) );
}
} else {
$this.text( i18n.parse( messageKey ) );
}
} else {
$this.find( '[data-i18n]' ).i18n();
}
} );
};
function getDefaultLocale() {
var locale = $( 'html' ).attr( 'lang' );
if ( !locale ) {
locale = navigator.language || navigator.userLanguage || '';
}
return locale;
}
$.i18n.languages = {};
$.i18n.messageStore = $.i18n.messageStore || {};
$.i18n.parser = {
// The default parser only handles variable substitution
parse: function ( message, parameters ) {
return message.replace( /\$(\d+)/g, function ( str, match ) {
var index = parseInt( match, 10 ) - 1;
return parameters[ index ] !== undefined ? parameters[ index ] : '$' + match;
} );
},
emitter: {}
};
$.i18n.fallbacks = {};
$.i18n.debug = false;
$.i18n.log = function ( /* arguments */ ) {
if ( window.console && $.i18n.debug ) {
window.console.log.apply( window.console, arguments );
}
};
/* Static members */
I18N.defaults = {
locale: getDefaultLocale(),
fallbackLocale: 'en',
parser: $.i18n.parser,
messageStore: $.i18n.messageStore
};
// Expose constructor
$.i18n.constructor = I18N;
}( jQuery ) );

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