Difference between revisions of "MediaWiki:LanguageHandler.js"

Latest revision as of 10:40, 9 June 2011

// <source lang="javascript">
/*
  Some basic language support, use by the upload form rewrite.
 
  Author: [[User:Lupo]], January 2008
  License: Quadruple licensed GFDL, GPL, LGPL and Creative Commons Attribution 3.0 (CC-BY-3.0)
 
  Choose whichever license of these you like best :-)
*/

var LanguageHandler = {

  languages : new Array (
    // Sorted by language name, not language code! Except for strange scripts... 
    {text : 'English', lang : 'en'},
    {text : 'Español', lang : 'es'}
  ),
  
  getSelect : function (id, preSelect, unknownLabel)
  {
    var select = document.createElement ('select');
    if (id != null) {
      select.setAttribute ('id', id);
      select.setAttribute ('name', id);
    }
    // Must have a text node. IE6 doesn't know Node.TEXT_NODE...
    while (unknownLabel && unknownLabel.nodeType != 3)
      unknownLabel = unknownLabel.firstChild;
    if (unknownLabel) {
      var unknown_option = document.createElement ('option');
      unknown_option.setAttribute ('value', 'unknown');
      unknown_option.appendChild (
        document.createTextNode (unknownLabel.data.replace (/^\s+/, "").replace (/\s+$/, "")));
      if (preSelect == null) unknown_option.setAttribute ('selected', 'selected');
      select.appendChild (unknown_option);
    }
    for (var i = 0; i < LanguageHandler.languages.length; i++) {
      var option = document.createElement ('option');
      option.setAttribute ('value', LanguageHandler.languages[i].lang);
      if (LanguageHandler.languages[i].lang == preSelect)
        option.setAttribute ('selected', 'selected');
      option.appendChild (document.createTextNode (LanguageHandler.languages[i].text));
      select.appendChild (option);
    }
    return select;      
  },
  
  closestIndex : function (langCode)
  {
    if (typeof (langCode) != 'string' || langCode == null || langCode.length == 0) return -1;
    // Check if we have it.
    if (langCode == 'nan' || langCode == 'minnan') langCode = 'zh-min-nan';
    for (var i = 0; i < LanguageHandler.languages.length; i++) {
      if (LanguageHandler.languages[i].lang == langCode) return i;
    }
    // Check for prefix
    var dash = langCode.indexOf ('-');
    if (dash >= 0)
      return LanguageHandler.closestIndex (langCode.substring (0, dash));
    return -1;
  },

  closestLanguage : function (langCode)
  {
    var idx = LanguageHandler.closestIndex (langCode);
    if (idx < 0) return null;
    return LanguageHandler.languages[idx].lang;
  },

  getPrefix : function (langStr)
  {
    // Given a string, check if any prefix substring matches one of the language codes. If so, return
    // the length of the longest matching language code, otherwise, return zero.
    // Note: if languageHandler.languages were sorted by length of language code, this could be sped up
    // by stopping on the first match. But the benefits of human-readability of the list in alphabetical
    // order outweigh this performance consideration.
    var match_length = 0;
    for (var i = 0; i < LanguageHandler.languages.length; i++) {
      var l = LanguageHandler.languages[i].lang.length;
      if (   l <= langStr.length && l > match_length
          && langStr.substr (0, l) == LanguageHandler.languages[i].lang)
        match_length = l;
    }
    return match_length;
  }

} // end LanguageHandler

// </source>