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

     2 

     3 /**

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

     5  * localized resources (strings and formatting patterns).

     6  *

     7  * @class Intl

     8  * @uses EventTarget

     9  * @static

    10  */

    11 

    12 var SPLIT_REGEX = /[, ]/;

    13 

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

    15 

    16  /**

    17     * Returns the language among those available that

    18     * best matches the preferred language list, using the Lookup

    19     * algorithm of BCP 47.

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

    21     * then "" is returned.

    22     * Extended language ranges are not supported.

    23     *

    24     * @method lookupBestLang

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

    26     * languages in descending preference order, represented as BCP 47

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

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

    29     * that the application supports, represented as BCP 47 language

    30     * tags.

    31     *

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

    33     * preferred language list, or "".

    34     * @since 3.1.0

    35     */

    36     lookupBestLang: function(preferredLanguages, availableLanguages) {

    37 

    38         var i, language, result, index;

    39 

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

    41         // if so return it

    42         function scan(language) {

    43             var i;

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

    45                 if (language.toLowerCase() ===

    46                             availableLanguages[i].toLowerCase()) {

    47                     return availableLanguages[i];

    48                 }

    49             }

    50         }

    51 

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

    53             preferredLanguages = preferredLanguages.split(SPLIT_REGEX);

    54         }

    55 

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

    57             language = preferredLanguages[i];

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

    59                 continue;

    60             }

    61             // check the fallback sequence for one language

    62             while (language.length > 0) {

    63                 result = scan(language);

    64                 if (result) {

    65                     return result;

    66                 } else {

    67                     index = language.lastIndexOf('-');

    68                     if (index >= 0) {

    69                         language = language.substring(0, index);

    70                         // one-character subtags get cut along with the

    71                         // following subtag

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

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

    74                         }

    75                     } else {

    76                         // nothing available for this language

    77                         break;

    78                     }

    79                 }

    80             }

    81         }

    82 

    83         return '';

    84     }

    85 });

    86 

    87 

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