YUI.add('intl-base', function (Y, NAME) {

/**

 * The Intl utility provides a central location for managing sets of

 * localized resources (strings and formatting patterns).

 *

 * @class Intl

 * @uses EventTarget

 * @static

 */

var SPLIT_REGEX = /[, ]/;

Y.mix(Y.namespace('Intl'), {

 /**

    * Returns the language among those available that

    * best matches the preferred language list, using the Lookup

    * algorithm of BCP 47.

    * If none of the available languages meets the user's preferences,

    * then "" is returned.

    * Extended language ranges are not supported.

    *

    * @method lookupBestLang

    * @param {String[] | String} preferredLanguages The list of preferred

    * languages in descending preference order, represented as BCP 47

    * language tags. A string array or a comma-separated list.

    * @param {String[]} availableLanguages The list of languages

    * that the application supports, represented as BCP 47 language

    * tags.

    *

    * @return {String} The available language that best matches the

    * preferred language list, or "".

    * @since 3.1.0

    */

    lookupBestLang: function(preferredLanguages, availableLanguages) {

        var i, language, result, index;

        // check whether the list of available languages contains language;

        // if so return it

        function scan(language) {

            var i;

            for (i = 0; i < availableLanguages.length; i += 1) {

                if (language.toLowerCase() ===

                            availableLanguages[i].toLowerCase()) {

                    return availableLanguages[i];

                }

            }

        }

        if (Y.Lang.isString(preferredLanguages)) {

            preferredLanguages = preferredLanguages.split(SPLIT_REGEX);

        }

        for (i = 0; i < preferredLanguages.length; i += 1) {

            language = preferredLanguages[i];

            if (!language || language === '*') {

                continue;

            }

            // check the fallback sequence for one language

            while (language.length > 0) {

                result = scan(language);

                if (result) {

                    return result;

                } else {

                    index = language.lastIndexOf('-');

                    if (index >= 0) {

                        language = language.substring(0, index);

                        // one-character subtags get cut along with the

                        // following subtag

                        if (index >= 2 && language.charAt(index - 2) === '-') {

                            language = language.substring(0, index - 2);

                        }

                    } else {

                        // nothing available for this language

                        break;

                    }

                }

            }

        }

        return '';

    }

});

}, '@VERSION@', {"requires": ["yui-base"]});