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96 lines
3.0 KiB
96 lines
3.0 KiB
2 years ago
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/*
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YUI 3.17.2 (build 9c3c78e)
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Copyright 2014 Yahoo! Inc. All rights reserved.
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Licensed under the BSD License.
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http://yuilibrary.com/license/
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*/
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YUI.add('intl-base', function (Y, NAME) {
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/**
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* The Intl utility provides a central location for managing sets of
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* localized resources (strings and formatting patterns).
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*
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* @class Intl
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* @uses EventTarget
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* @static
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*/
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var SPLIT_REGEX = /[, ]/;
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Y.mix(Y.namespace('Intl'), {
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/**
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* Returns the language among those available that
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* best matches the preferred language list, using the Lookup
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* algorithm of BCP 47.
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* If none of the available languages meets the user's preferences,
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* then "" is returned.
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* Extended language ranges are not supported.
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*
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* @method lookupBestLang
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* @param {String[] | String} preferredLanguages The list of preferred
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* languages in descending preference order, represented as BCP 47
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* language tags. A string array or a comma-separated list.
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* @param {String[]} availableLanguages The list of languages
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* that the application supports, represented as BCP 47 language
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* tags.
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*
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* @return {String} The available language that best matches the
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* preferred language list, or "".
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* @since 3.1.0
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*/
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lookupBestLang: function(preferredLanguages, availableLanguages) {
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var i, language, result, index;
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// check whether the list of available languages contains language;
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// if so return it
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function scan(language) {
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var i;
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for (i = 0; i < availableLanguages.length; i += 1) {
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if (language.toLowerCase() ===
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availableLanguages[i].toLowerCase()) {
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return availableLanguages[i];
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}
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}
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}
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if (Y.Lang.isString(preferredLanguages)) {
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preferredLanguages = preferredLanguages.split(SPLIT_REGEX);
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}
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for (i = 0; i < preferredLanguages.length; i += 1) {
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language = preferredLanguages[i];
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if (!language || language === '*') {
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continue;
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}
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// check the fallback sequence for one language
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while (language.length > 0) {
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result = scan(language);
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if (result) {
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return result;
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} else {
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index = language.lastIndexOf('-');
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if (index >= 0) {
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language = language.substring(0, index);
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// one-character subtags get cut along with the
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// following subtag
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if (index >= 2 && language.charAt(index - 2) === '-') {
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language = language.substring(0, index - 2);
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}
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} else {
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// nothing available for this language
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break;
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}
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}
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}
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}
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return '';
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}
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});
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}, '3.17.2', {"requires": ["yui-base"]});
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