1 /*

     2 YUI 3.10.3 (build 2fb5187)

     3 Copyright 2013 Yahoo! Inc. All rights reserved.

     4 Licensed under the BSD License.

     5 http://yuilibrary.com/license/

     6 */

     7 

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

     9 

    10 /**

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

    12  * localized resources (strings and formatting patterns).

    13  *

    14  * @class Intl

    15  * @uses EventTarget

    16  * @static

    17  */

    18 

    19 var SPLIT_REGEX = /[, ]/;

    20 

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

    22 

    23  /**

    24     * Returns the language among those available that

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

    26     * algorithm of BCP 47.

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

    28     * then "" is returned.

    29     * Extended language ranges are not supported.

    30     *

    31     * @method lookupBestLang

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

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

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

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

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

    37     * tags.

    38     *

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

    40     * preferred language list, or "".

    41     * @since 3.1.0

    42     */

    43     lookupBestLang: function(preferredLanguages, availableLanguages) {

    44 

    45         var i, language, result, index;

    46 

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

    48         // if so return it

    49         function scan(language) {

    50             var i;

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

    52                 if (language.toLowerCase() ===

    53                             availableLanguages[i].toLowerCase()) {

    54                     return availableLanguages[i];

    55                 }

    56             }

    57         }

    58 

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

    60             preferredLanguages = preferredLanguages.split(SPLIT_REGEX);

    61         }

    62 

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

    64             language = preferredLanguages[i];

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

    66                 continue;

    67             }

    68             // check the fallback sequence for one language

    69             while (language.length > 0) {

    70                 result = scan(language);

    71                 if (result) {

    72                     return result;

    73                 } else {

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

    75                     if (index >= 0) {

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

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

    78                         // following subtag

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

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

    81                         }

    82                     } else {

    83                         // nothing available for this language

    84                         break;

    85                     }

    86                 }

    87             }

    88         }

    89 

    90         return '';

    91     }

    92 });

    93 

    94 

    95 }, '3.10.3', {"requires": ["yui-base"]});