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// <source lang=javascript">

/*
  Small JS library containing stuff I use often.
  
  Author: [[User:Lupo]], June 2009
  License: Quadruple licensed GFDL, GPL, LGPL and Creative Commons Attribution 3.0 (CC-BY-3.0)
 
  Choose whichever license of these you like best :-)

  Includes the following components:
   - Object enhancements (clone, merge)
   - String enhancements (trim, ...)
   - Array enhancements (JS 1.6)
   - Function enhancements (bind)
   - LAPI            Most basic DOM functions: $ (getElementById), make
   -   LAPI.Ajax     Ajax request implementation, tailored for MediaWiki/WMF sites
   -   LAPI.Browser  Browser detection (general)
   -   LAPI.DOM      DOM helpers, some tailored to MediaWiki/WMF sites, including a cross-browser
                     DOM parser
   -   LAPI.Edit     Simple editor implementation with save, cancel, preview (for WMF sites)
   -   LAPI.Evt      Event handler routines (general)
   -   LAPI.Pos      Position calculations (general)
*/

// Global: wgServer, wgScript, wgUserLanguage, injectSpinner, removeSpinner (from wiki.js)
// Global: importScript (from wiki.js, for MediaWiki:AjaxSubmit.js)

// Some basic routines, mainly enhancements of the String, Array, and Function objects.
// Some taken from Javascript 1.6, some own.

/** Object enhancements ************/

// Note: adding these to the prototype may break other code that assumes that
// {} has no properties at all.
Object.clone = function (source, includeInherited)
{
  if (!source) return null;
  var result = {};
  for (key in source) {
    if (includeInherited || source.hasOwnProperty (key)) result[key] = source[key];
  }
  return result;
};

Object.merge = function (from, into, includeInherited)
{
  if (!from) return into;
  for (key in from) {
    if (includeInherited || from.hasOwnProperty (key)) into[key] = from[key];
  }
  return into;
};

Object.mergeSome = function (from, into, includeInherited, predicate)
{
  if (!from) return into;
  if (typeof (predicate) == 'undefined')
    return Object.merge (from, into, includeInherited);
  for (key in from) {
    if ((includeInherited || from.hasOwnProperty (key)) && predicate (from, into, key))
      into[key] = from[key];
  }
  return into;
};

Object.mergeSet = function (from, into, includeInherited)
{
  return Object.mergeSome
           (from, into, includeInherited, function (src, tgt, key) {return src[key] != null;});
}

/** String enhancements (Javascript 1.6) ************/

// Removes all whitespace from both ends of the string.
if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace (/^\s+|\s+$/g, "");
  };
}

// Removes all whitespace from the beginning of the string.
if (!String.prototype.trimLeft) {
  String.prototype.trimLeft = function () {
    return this.replace (/^\s\s*/, "");
  };
}
String.prototype.trimFront = String.prototype.trimLeft; // Synonym

// Removes all whitespace from the end of the string.
if (!String.prototype.trimRight) {
  String.prototype.trimRight = function () {
    return this.replace (/\s\s*$/, "");
  };
}
String.prototype.trimEnd = String.prototype.trimRight; // Synonym

/** Further String enhancements ************/

// Returns true if the string begins with prefix.
String.prototype.startsWith = function (prefix) {
  return this.indexOf (prefix) == 0;
};

// Returns true if the string ends in suffix
String.prototype.endsWith = function (suffix) {
  return this.lastIndexOf (suffix) + suffix.length == this.length;
};

// Returns true if the string contains s.
String.prototype.contains = function (s) {
  return this.indexOf (s) >= 0;
};

// Replace all occurrences of a string pattern by replacement.
String.prototype.replaceAll = function (pattern, replacement) {
  return this.split (pattern).join (replacement);
};

// Escape all backslashes and single or double quotes such that the result can
// be used in Javascript inside quotes or double quotes.
String.prototype.stringifyJS = function () {
  return this.replace (/([\\\'\"]|%5C|%27|%22)/g, '\\$1') // ' // Fix syntax coloring
             .replace (/\n/g, '\\n');
}

// Escape all RegExp special characters such that the result can be safely used
// in a RegExp as a literal.
String.prototype.escapeRE = function () {
  return this.replace (/([\\{}()|.?*+^$\[\]])/g, "\\$1");
};

String.prototype.escapeXML = function (quot, apos) {
  var s    = this.replace (/&/g,    '&amp;')
                 .replace (/\xa0/g, '&nbsp;')
                 .replace (/</g,    '&lt;')
                 .replace (/>/g,    '&gt;');
  if (quot) s = s.replace (/\"/g,   '&quot;'); // " // Fix syntax coloring
  if (apos) s = s.replace (/\'/g,   '&apos;'); // ' // Fix syntax coloring
  return s;
};

String.prototype.decodeXML = function () {
  return this.replace(/&quot;/g, '"')
             .replace(/&apos;/g, "'")
             .replace(/&gt;/g,   '>')
             .replace(/&lt;/g,   '<')
             .replace(/&nbsp;/g, '\xa0')
             .replace(/&amp;/g,  '&');
};

String.prototype.capitalizeFirst = function () {
  return this.substring (0, 1).toUpperCase() + this.substring (1);
};

String.prototype.lowercaseFirst = function () {
  return this.substring (0, 1).toLowerCase() + this.substring (1);
};

// This is actually a function on URLs, but since URLs typically are strings in
// Javascript, let's include this one here, too.
String.prototype.getParamValue = function (param) {
  var re = new RegExp ('[&?]' + param.escapeRE () + '=([^&]*)');
  var m  = re.exec (this);
  if (m && m.length >= 2) return decodeURIComponent (m[1]);
  return null;
};

String.getParamValue = function (param, url)
{
  if (typeof (url) == 'undefined' || url === null) url = document.location.href;
  try {
    return url.getParamValue (param);
  } catch (e) { 
    return null;
  }
};

/** Function enhancements ************/

// Return a function that calls the function with 'this' bound to 'thisObject'
Function.prototype.bind = function (thisObject) {
  var f = this, obj = thisObject;
  return function () { return f.apply (obj, arguments); };
};


/** Array enhancements (Javascript 1.6) ************/

// Note that contrary to JS 1.6, we treat the thisObject as optional.

// Returns a new array containing only those elements for which predicate
// is true.
if (!Array.prototype.filter) {
  Array.prototype.filter = function (predicate, thisObject)
  {
    return Array.filter (this, predicate, thisObject); 
  };
}
if (!Array.filter) {
  Array.filter = function (target, predicate, thisObject)
  {
    if (typeof (predicate) != 'function')
      throw new Error ('Array.filter: predicate must be a function');
    var l = target.length;
    var result = [];
    if (thisObject) predicate = predicate.bind (thisObject);
    for (var i=0; l && i < l; i++) {
      if (i in target) {
        var curr = target[i];
        if (predicate (curr, i, target)) result[result.length] = curr;
      }
    }
    return result;
  };
}
Array.prototype.select = Array.prototype.filter; // Synonym
Array.select           = Array.filter;           // Synonym

// Calls iterator on all elements of the array
if (!Array.prototype.forEach) {
  Array.prototype.forEach = function (iterator, thisObject)
  {
    Array.forEach (this, iterator, thisObject);
  };
}
if (!Array.forEach) {
  Array.forEach = function (target, iterator, thisObject)
  {
    if (typeof (iterator) != 'function')
      throw new Error ('Array.forEach: iterator must be a function');
    var l = target.length;
    if (thisObject) iterator = iterator.bind (thisObject);
    for (var i=0; l && i < l; i++) {
      if (i in target) iterator (target[i], i, target);
    }
  };
}

// Returns true if predicate is true for every element of the array, false otherwise
if (!Array.prototype.every) { 
  Array.prototype.every = function (predicate, thisObject)
  {
    return Array.every (this, predicate, thisObject);
  };
}
if (!Array.every) {
  Array.every = function (target, predicate, thisObject)
  {
    if (typeof (predicate) != 'function')
      throw new Error ('Array.every: predicate must be a function');
    var l = target.length;
    if (thisObject) predicate = predicate.bind (thisObject);
    for (var i=0; l && i < l; i++) {
      if (i in target && !predicate (target[i], i, target)) return false;
    }
    return true;
  };
}
Array.prototype.forAll = Array.prototype.every; // Synonym
Array.forAll           = Array.every;           // Synonym

// Returns true if predicate is true for at least one element of the array, false otherwise.
if (!Array.prototype.some) {
  Array.prototype.some = function (predicate, thisObject)
  {
    return Array.some (this, predicate, thisObject);
  };
}
if (!Array.some) {
  Array.some = function (target, predicate, thisObject)
  {
    if (typeof (predicate) != 'function')
      throw new Error ('Array.some: predicate must be a function');
    var l = target.length;
    if (thisObject) predicate = predicate.bind (thisObject);
    for (var i=0; l && i < l; i++) {
      if (i in target && predicate (target[i], i, target)) return true;
    }
    return false;
  };
}
Array.prototype.exists = Array.prototype.some; // Synonym
Array.exists           = Array.some;           // Synonym

// Returns a new array built by applying mapper to all elements.
if (!Array.prototype.map) {
  Array.prototype.map = function (mapper, thisObject)
  {
    return Array.map (this, mapper, thisObject);
  };
}
if (!Array.map) {
  Array.map = function (target, mapper, thisObject)
  {
    if (typeof (mapper) != 'function')
      throw new Error ('Array.map: mapper must be a function');
    var l = target.length;
    var result = [];
    if (thisObject) mapper = mapper.bind (thisObject);
    for (var i=0; l && i < l; i++) {
      if (i in target) result[i] = mapper (target[i], i, target);
    }
    return result;
  };
}

if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (elem, from)
  {
    return Array.indexOf (this, elem, from);
  };
}
if (!Array.indexOf) {
  Array.indexOf = function (target, elem, from)
  {
    if (typeof (target.length) == 'undefined') return -1;
    var l = target.length;    
    if (isNaN (from)) from = 0; else from = from || 0;
    from = (from < 0) ? Math.ceil (from) : Math.floor (from);
    if (from < 0) from += l;
    if (from < 0) from = 0;
    while (from < l) {
      if (from in target && target[from] === elem) return from;
      from += 1;
    }
    return -1;
  };
}

if (!Array.prototype.lastIndexOf) {
  Array.prototype.lastIndexOf = function (elem, from)
  {
    return Array.lastIndexOf (this, elem, from);
  };
}
if (!Array.lastIndexOf) {
  Array.lastIndexOf = function (target, elem, from)
  {
    if (typeof (target.length) == 'undefined') return -1;
    var l = target.length;
    if (isNaN (from)) from = l-1; else from = from || (l-1);
    from = (from < 0) ? Math.ceil (from) : Math.floor (from);
    if (from < 0) from += l; else if (from >= l) from = l-1;
    while (from >= 0) {
      if (from in target && target[from] === elem) return from;
      from -= 1;
    }
    return -1;
  };
}

/** Additional Array enhancements ************/

Array.prototype.remove = function (elem) {
  var i = this.indexOf (elem);
  if (i >= 0) this.splice (i, 1);
};

Array.prototype.contains = function (elem) {
  return this.indexOf (elem) >= 0;
};

Array.prototype.flatten = function () {
  var result = [];
  this.forEach (function (elem) {result = result.concat (elem);});
  return result;
};

// Calls selector on the array elements until it returns a non-null object
// and then returns that object. If selector always returns null, any also
// returns null. See also Array.map.
Array.prototype.any = function (selector, thisObject)
{
  return Array.any (this, selector, thisObject);
};
Array.any = function (target, selector, thisObject)
{
  if (typeof (selector) != 'function')
    throw new Error ('Array.any: selector must be a function');
  var l = target.length;
  var result = null;
  if (thisObject) selector = selector.bind (thisObject);
  for (var i=0; l && i < l; i++) {
    if (i in target) {
      result = selector (target[i], i, target);
      if (result != null) return result;
    }
  }
  return null;
};

// Return a contiguous array of the contents of source, which may be an array or pseudo-array,
// basically anything that has a length and can be indexed. (E.g. live HTMLCollections, but also
// Strings, or objects, or the arguments "variable".
Array.make = function (source)
{
  if (!source || typeof (source.length) == 'undefined') return null;
  var result = [];
  var l      = source.length;
  for (var i=0; i < l; i++) {
    if (i in source) result[result.length] = source[i];
  }
  return result;
};

if (typeof (LAPI) == 'undefined') {

var LAPI = {
  Ajax :
  {
    getRequest : function ()
    {
      var request = null;
      try {
        request = new XMLHttpRequest();
      } catch (anything) {
        if (!!window.ActiveXObject) {
          try {
            request = new ActiveXObject("Msxml2.XMLHTTP");
          } catch (any_error) {
            try {
              request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (whatever) {
              request = null;
            }
          }
        }
      }
      return request;
    }
  },

  $ : function (selector, doc, multi)
  {
    if (!selector || selector.length == 0) return null;
    doc = doc || document;
    if (typeof (selector) == 'string') {
      if (selector.charAt (0) == '#') selector = selector.substring (1);
      if (selector.length > 0) return doc.getElementById (selector);
      return null;
    } else {
      if (multi) return selector.map (function (id) {return LAPI.$ (id, doc);});
      return selector.any (function (id) {return LAPI.$ (id, doc);});
    }
  },

  make : function (tag, attribs, css, doc)
  {
    doc = doc || document;
    if (!tag || tag.length == 0) throw new Error ('No tag for LAPI.make');
    var result = doc.createElement (tag);
    Object.mergeSet (attribs, result);
    Object.mergeSet (css, result.style);
    if (/^(form|input|button|select|textarea)$/.test (tag) &&
        result.id && result.id.length > 0 && !result.name
       )
    {
      result.name = result.id;
    }
    return result;
  },

  formatException : function (ex, asDOM)
  {
    var name = ex.name || "";
    var msg  = ex.message || "";
    var file = null;
    var line = null;
    if (msg && msg.length > 0 && msg.charAt (0) == '#') {
      // User msg: don't confuse users with error locations. (Note: could also use
      // custom exception types, but that doesn't work right on IE6.)
      msg = msg.substring (1);
    } else {
      file = ex.fileName || ex.sourceURL || null; // Gecko, Webkit, others
      line = ex.lineNumber || ex.line || null;    // Gecko, Webkit, others
    }
    if (name || msg) {
      if (!asDOM) {
        return
          'Exception ' + name + ': ' + msg
          + (file ? '\nFile ' + file + (line ? ' (' + line + ')' : "") : "")
          ;
      } else {
        var ex_msg = LAPI.make ('div');
        ex_msg.appendChild (document.createTextNode ('Exception ' + name + ': ' + msg));
        if (file) {
          ex_msg.appendChild (LAPI.make ('br'));
          ex_msg.appendChild
            (document.createTextNode ('File ' + file + (line ? ' (' + line + ')' : "")));
        }
        return ex_msg;
      }
    } else {
      return null;
    }
  }

};

} // end if (guard)

if (typeof (LAPI.Browser) == 'undefined') {
  
// Yes, usually it's better to test for available features. But sometimes there's no
// way around testing for specific browsers (differences in dimensions, layout errors,
// etc.)
LAPI.Browser =
(function (agent) {
  var result = {};
  result.client = agent;
  var m = agent.match(/applewebkit\/(\d+)/);
  result.is_webkit = (m != null);
  result.is_safari = result.is_webkit && !agent.contains ('spoofer');
  result.webkit_version = (m ? parseInt (m[1]) : 0);
  result.is_khtml =
       navigator.vendor == 'KDE'
    || (document.childNodes && !document.all && !navigator.taintEnabled);
  result.is_gecko =
       agent.contains ('gecko')
    && !/khtml|spoofer|netscape\/7\.0/.test (agent);
  result.is_ff_2    = agent.contains ('firefox/2');
  result.is_ff_ge_2 = /firefox\/[2-9]|minefield\/3/.test (agent);
  result.is_ie      = agent.contains ('msie') || !!window.ActiveXObject;
  result.is_ie_lt_7 = false;
  if (result.is_ie) {
    var version = /msie ((\d|\.)+)/.exec (agent);
    result.is_ie_lt_7  = (version != null && (parseFloat(version[1]) < 7));
  }
  result.is_opera    = agent.contains ('opera');
  result.is_opera_95 = false;
  if (result.is_opera) {
    m = /opera\/((\d|\.)+)/.exec (agent);
    result.is_opera_95 = m && (parseFloat (m[1]) >= 9.5);
  }
  result.is_mac = agent.contains ('mac');
  return result;
})(navigator.userAgent.toLowerCase ());

} // end if (guard)

if (typeof (LAPI.DOM) == 'undefined') {
  
LAPI.DOM =
{
  // IE6 doesn't have these Node constants in Node, so put them here
  ELEMENT_NODE                :  1,
  ATTRIBUTE_NODE              :  2,
  TEXT_NODE                   :  3,
  CDATA_SECTION_NODE          :  4,
  ENTITY_REFERENCE_NODE       :  5,
  ENTITY_NODE                 :  6,
  PROCESSING_INSTRUCTION_NODE :  7,
  COMMENT_NODE                :  8,
  DOCUMENT_NODE               :  9,
  DOCUMENT_TYPE_NODE          : 10,
  DOCUMENT_FRAGMENT_NODE      : 11,
  NOTATION_NODE               : 12,

  parse : function (str, content_type)
  {
    function getDocument (str, content_type)
    {
      if (typeof (DOMParser) != 'undefined') {
        var parser = new DOMParser ();
        if (parser && parser.parseFromString)
          return parser.parseFromString (str, content_type);
      }
      // We don't have DOMParser
      if (LAPI.Browser.is_ie) {
        var doc = null;
        // Apparently, these can be installed side-by-side. Try to get the newest one available.
        // Unfortunately, one finds a variety of version strings on the net. I have no idea which
        // ones are correct.
        if (typeof (LAPI.DOM.parse.msDOMDocumentID) == 'undefined') {
          // If we find a parser, we cache it. If we cannot find one, we also remember that.
          var parsers =
            [ 'MSXML6.DOMDocument','MSXML5.DOMDocument','MSXML4.DOMDocument','MSXML3.DOMDocument'
             ,'MSXML2.DOMDocument.5.0','MSXML2.DOMDocument.4.0','MSXML2.DOMDocument.3.0'
             ,'MSXML2.DOMDocument','MSXML.DomDocument','Microsoft.XmlDom'];
          for (var i=0; i < parsers.length && !doc; i++) {
            try {
              doc = new ActiveXObject (parsers[i]);
              if (doc) LAPI.DOM.parse.msDOMDocumentID = parsers[i];
            } catch (ex) {
              doc = null;
            }
          }
          if (!doc) LAPI.DOM.parse.msDOMDocumentID = null;
        } else if (LAPI.DOM.parse.msDOMDocumentID) {
          doc = new ActiveXObject (LAPI.DOM.parse.msDOMDocumentID);
        }
        if (doc) {
          doc.async = false;
          doc.loadXML (str);
          return doc;
        }
      } 
      // Try using a "data" URI (http://www.ietf.org/rfc/rfc2397). Reported to work on
      // older Safaris.
      content_type  = content_type || 'application/xml';
      var req = LAPI.Ajax.getRequest ();
      if (req) {
        // Synchronous is OK, since "data" URIs are local
        req.open
          ('GET', 'data:' + content_type + ';charset=utf-8,' + encodeURIComponent (str), false);
        if (req.overrideMimeType) req.overrideMimeType (content_type);
        req.send (null);
        return req.responseXML;
      }
      return null;
    } // end getDocument

    var doc = null;

    try {
      doc = getDocument (str, content_type);
    } catch (ex) {
      doc = null;
    }
    if (   (   (str.startsWith ('<!DOCTYPE html') || str.startsWith ('<html'))
            && (!doc || !doc.documentElement)
           )
        ||
           (doc && (   LAPI.Browser.is_ie
                    && (!doc.documentElement
                        && doc.parseError && doc.parseError.errorCode != 0
                        && doc.parseError.reason.contains ('Error processing resource')
                        && doc.parseError.reason.contains
                             ('http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd')
                       )
                   )
           )
       )
    {
      // Either the text specified an (X)HTML document, but we failed to get a Document, or we
      // hit the walls of the single-origin policy on IE which tries to get the DTD from the
      // URI specified... Let's fake a document:
      doc = LAPI.DOM.fakeHTMLDocument (str);
    }
    return doc;
  },

  parseHTML : function (str, sanity_check)
  {
    // Simplified from the above, for cases where we *know* up front that the text is (X)HTML.
    var doc = null;
    if (typeof (DOMParser) != 'undefined') {
      var parser = new DOMParser ();
      if (parser && parser.parseFromString)
        doc = parser.parseFromString (str, 'text/xml');
    }
    if (!doc || !doc.documentElement || /^parsererror$/i.test (doc.documentElement.tagName)
        || (sanity_check && doc.getElementById (sanity_check) == null))
    {
      // We had an error, or the sanity check (looking for an element known to be there) failed.
      // (Happens on Konqueror 4.2.3/4.2.4 upon the very first call...)
      doc = LAPI.DOM.fakeHTMLDocument (str);
    }
    return doc;
  },

  fakeHTMLDocument : function (str)
  {
    var body_tag = /<body.*?>/.exec (str);
    if (!body_tag || body_tag.length == 0) return null;
    body_tag = body_tag.index + body_tag[0].length; // Index after the opening body tag
    var body_end = str.lastIndexOf ('</body>');
    if (body_end < 0) return null;
    var content = str.substring (body_tag, body_end); // Anything in between          
    content = content.replace(/<script(.|\s)*?\/script>/g, ""); // Sanitize: strip scripts
    return new LAPI.DOM.DocumentFacade (content);
  },

  isValid : function (doc)
  {
    if (!doc) return doc;
    if (typeof (doc.parseError) != 'undefined') { // IE
      if (doc.parseError.errorCode != 0) {
        throw new Error (  'XML parse error: ' + doc.parseError.reason
                         + ' line ' + doc.parseError.line
                         + ' col ' + doc.parseError.linepos
                         + '\nsrc = ' + doc.parseError.srcText);
      }
    } else {
      // FF... others?
      var root = doc.documentElement;
      if (/^parsererror$/i.test (root.tagName)) {
        throw new Error ('XML parse error: ' + root.getInnerText ());
      }
    }
    return doc;
  },

  content : function (doc)
  {
    // Monobook, modern, classic skins
    return LAPI.$ (['bodyContent', 'mw_contentholder', 'article'], doc);
  },

  hasClass : function (node, className)
  {
    if (!node) return false;
    return (' ' + node.className + ' ').contains (' ' + className + ' ');
  },
  
  setContent : function (node, content)
  {
    if (content == null) return node;
    LAPI.DOM.removeChildren (node);
    if (content.nodeName) { // presumably a DOM tree, like a span or a document fragment
      node.appendChild (content);
    } else if (typeof (node.innerHTML) != 'undefined') {
      node.innerHTML = content.toString ();
    } else {
      node.appendChild (document.createTextNode (content.toString ()));
    }
    return node;
  },

  makeImage : function (src, width, height, title, doc)
  {
    return LAPI.make (
               'img'
             , {src : src, width: "" + width, height : "" + height, title : title}
             , doc
           );
  },

  makeButton : function (id, text, f, submit, doc)
  {
    return LAPI.make (
               'input'
             , {id : id || "", type: (submit ? 'submit' : 'button'), value: text, onclick: f}
             , doc
           );
  },
  
  makeLabel : function (id, text, for_elem, doc)
  {
    var label = LAPI.make ('label', {id: id || "", "for": for_elem}, null, doc);
    return LAPI.DOM.setContent (label, text);
  },
  
  makeLink : function (url, text, tooltip, onclick, doc)
  {
    var lk = LAPI.make ('a', {href: url, title: tooltip, onclick: onclick}, null, doc);
    return LAPI.DOM.setContent (lk, text || url);
  },
  
  // Unfortunately, extending Node.prototype may not work on some browsers,
  // most notably (you've guessed it) IE...
  
  getInnerText : function (node)
  {
    if (node.textContent) return node.textContent;
    if (node.innerText)   return node.innerText;
    var result = "";
    if (node.nodeType == LAPI.DOM.TEXT_NODE) {
      result = node.nodeValue;
    } else {
      node.childNodes.forEach (
        function (elem) {
          switch (elem.nodeType) {
            case LAPI.DOM.ELEMENT_NODE:
              result += LAPI.DOM.getInnerText (elem);
              break;
            case LAPI.DOM.TEXT_NODE:
              result += elem.nodeValue;
              break;
          }
        }
      );
    }
    return result;
  },
  
  removeNode : function (node)
  {
    if (node.parentNode) node.parentNode.removeChild (node);
    return node;
  },

  removeChildren : function (node)
  {
    if (typeof (node.innerHTML) != undefined) node.innerHTML = "";
    // Catch the case where the node is not yet attached in the document.
    // (Or where we don't have the non-standard innerHTML.)
    while (node.firstChild) node.removeChild (node.firstChild);
    return node;
  },

  insertNode : function (node, before)
  {
    before.parentNode.insertBefore (node, before);
    return node;
  },

  insertAfter : function (node, after)
  {
    var next = after.nextSibling;
    after.parentNode.insertBefore (node, next);
    return node;
  },
  
  replaceNode : function (node, newNode)
  {
    node.parentNode.replaceChild (node, newNode);
    return newNode;
  },
  
  isParentOf : function (parent, child)
  {
    while (child && child != parent && child.parentNode) child = child.parentNode;
    return child == parent;
  },

  // Property is to be in CSS style, e.g. 'background-color', not in JS style ('backgroundColor')!
  currentStyle : function (element, property)
  {
    function normalize (prop) {
      // Don't use a regexp with a lambda function (available only in JS 1.3)...
      var result = prop.split ('-');
      result = result.map (function (s) { if (s) return s.capitalizeFirst (); else return s;});
      result = result.join ("");
      return result.lowercaseFirst ();
    }

    if (window.getComputedStyle) // Gecko etc.
      return window.getComputedStyle (element, null).getPropertyValue (property);
    else if (element.currentStyle) // IE, has subtle differences to getComputedStyle
      return element.currentStyle[normalize (property)];
    else // Not exactly right, but best effort
      return element.style[normalize (property)];      
  }

}; // end LAPI.DOM

LAPI.DOM.DocumentFacade = function () {this.initialize.apply (this, arguments);};

LAPI.DOM.DocumentFacade.prototype =
{
  initialize : function (text)
  {
    // It's not a real document, but it will behave like one for our purposes.
    this.documentElement = LAPI.make ('div', null, {display: 'none', position: 'absolute'});
    this.body = LAPI.make ('div', null, {position: 'relative'});
    this.documentElement.appendChild (this.body);
    document.body.appendChild (this.documentElement);
    this.body.innerHTML = text;
    // Find all forms
    var forms = document.getElementsByTagName ('form');
    var self = this;
    this.forms = Array.select (forms, function (f) {return LAPI.DOM.isParentOf (self.body, f);});
    // Konqueror 4.2.3/4.2.4 clears form.elements when the containing div is removed from the
    // parent document?!
    if (!LAPI.Browser.is_khtml) {
      LAPI.DOM.removeNode (this.documentElement);
    } else {
      this.dispose = function () {LAPI.DOM.removeNode (this.documentElement);};
      // Since we must leave the stuff *in* the original document on Konqueror, we'll also need a
      // dispose routine... what an ugly hack.
    }
    this.allIDs = {};
    this.isFake = true;
  },

  createElement : function (tag) { return document.createElement (tag); },
  createDocumentFragment : function () { return document.createDocumentFragment (); },
  createTextNode : function (text) { return document.createTextNode (text); },
  createComment : function (text) { return document.createComment (text); },
  createCDATASection : function (text) { return document.createCDATASection (text); },
  createAttribute : function (name) { return document.createAttribute (name); },
  createEntityReference : function (name) { return document.createEntityReference (name); },
  createProcessingInstruction : function (target, data) { return document.createProcessingInstruction (target, data); },
  
  getElementsByTagName : function (tag)
  {
    // Grossly inefficient, but deprecated anyway
    var res = [];
    function traverse (node, tag)
    {
      if (node.nodeName.toLowerCase () == tag) res[res.length] = node;
      var curr = node.firstChild;
      while (curr) { traverse (curr); curr = curr.nextSibling; }
    }
    traverse (this.body, tag.toLowerCase ());
    return res;
  },

  getElementById : function (id)
  {
    function traverse (elem, id)
    {
      if (elem.id == id) return elem;
      var res  = null;
      var curr = elem.firstChild;
      while (curr && !res) {
        res = traverse (curr, id);
        curr = curr.nextSibling;
      }
      return res;
    }
    
    if (!this.allIDs[id]) this.allIDs[id] = traverse (this.body, id);
    return this.allIDs[id];
  },

  importNode : function (node, deep) { document.importNode (node, deep); }
  // ...NS operations omitted

}; // end DocumentFacade

} // end if (guard)

if (typeof (LAPI.Ajax.doAction) == 'undefined') {

importScript ('User:Lupo/as.js'); // Legacy code: ajaxSubmit

LAPI.Ajax.getXML = function (request, failureFunc)
{
  var doc = null;
  if (request.responseXML && request.responseXML.documentElement) {
    doc = request.responseXML;
  } else {
    try {
      doc = LAPI.DOM.parse (request.responseText, 'text/xml');
    } catch (ex) {
      if (typeof (failureFunc) == 'function') failureFunc (request, ex);
      doc = null;
    }
  }
  if (doc) {
    try {
      doc = LAPI.DOM.isValid (doc);
    } catch (ex) {
      if (typeof (failureFunc) == 'function') failureFunc (request, ex);
      doc = null;
    }
  }
  return doc;
};

LAPI.Ajax.getHTML = function (request, failureFunc, sanity_check)
{
  // Konqueror sometimes has severe problems with responseXML. It does set it, but getElementById
  // may fail to find elements known to exist.
  var doc = null;
  if (request.responseXML && request.responseXML.documentElement &&
      (!sanity_check || request.responseXML.getElementById (sanity_check) != null)
     )
  {
    doc = request.responseXML;
  } else {
    try {
      doc = LAPI.DOM.parseHTML (request.responseText, sanity_check);
      if (!doc) throw new Error ('#Could not understand request result');
    } catch (ex) {
      if (typeof (failureFunc) == 'function') failureFunc (request, ex);
      doc = null;
    }
  }
  if (doc) {
    try {
      doc = LAPI.DOM.isValid (doc);
    } catch (ex) {
      if (typeof (failureFunc) == 'function') failureFunc (request, ex);
      doc = null;
    }
  }
  return doc;
};

// modify is supposed to save the changes at the end, e.g. using LAPI.Ajax.submit.
// modify is called with three parameters: the document, possibly the form, and the optional
// failure function. The failure function is called with the request as the first parameter,
// and possibly an exception as the second parameter.
LAPI.Ajax.doAction = function (page, action, form, modify, failure)
{
  if (!page || !action || !modify || typeof (modify) != 'function') return;
  var original_failure = failure;
  if (!failure || typeof (failure) != 'function') failure = function () {};
  var request = LAPI.Ajax.getRequest ();
  var url = wgServer + wgScript + '?title=' + encodeURIComponent (page) + '&action=' + action;
  request.open ('GET', url, true);
  request.setRequestHeader ('Pragma', 'cache=yes');
  request.setRequestHeader ('Cache-Control', 'no-transform');
  if (request.overrideMimeType) request.overrideMimeType ('application/xml');
  request.onreadystatechange =
    function () {
      if (request.readyState != 4) return;
      var doc         = null;
      var the_form    = null;
      var revision_id = null;
      try {
        if (request.status != 200)
          throw new Error ('#Request to server failed. Status: ' + request.status);

        // Convert responseText into DOM tree.
        doc = LAPI.Ajax.getHTML (request, failure, form);      
        if (!doc) return;
        if (form) {
          the_form = LAPI.$ (form, doc);
          if (!the_form) throw new Error ('#Server reply does not contain mandatory form.');
        }
        revision_id = request.responseText.match (/var wgCurRevisionId = (\d+);/);
        if (revision_id) revision_id = parseInt (revision_id[1]);
      } catch (ex) {
        failure (request, ex);
        return;
      }
      modify (doc, the_form, original_failure, revision_id)
    };
  request.send (null);
}; // end LAPI.Ajax.doAction
  
LAPI.Ajax.submit = function (form, after_submit)
{
  try {
    ajaxSubmit (form, null, after_submit, true); // Legacy code from MediaWiki:AjaxSubmit
  } catch (ex) {
    after_submit (null, ex);
  }
}; // end LAPI.Ajax.submit

LAPI.Ajax.editPage = function (page, modify, failure)
{
  LAPI.Ajax.doAction (page, 'edit', 'editform', modify, failure);
}; // end LAPI.Ajax.editPage
  
LAPI.Ajax.checkEdit = function (request)
{
  if (!request) return true;
  // Check for previews (session token lost?) or edit forms (edit conflict). 
  try {
    var doc = LAPI.Ajax.getHTML (request, function () {throw new Error ('Cannot check HTML');});
    if (!doc) return false;
    return LAPI.$ (['wikiPreview', 'editform'], doc) == null;
  } catch (anything) {
    return false;
  }
}; // end LAPI.Ajax.checkEdit
  
LAPI.Ajax.submitEdit = function (form, success, failure)
{
  if (!success || typeof (success) != 'function') success = function () {};
  if (!failure || typeof (failure) != 'function') failure = function () {};
  LAPI.Ajax.submit (
      form
    , function (request, ex)
      {
        if (ex) {
          failure (request, ex);
        } else {
          var successful = false;
          try {
            successful = request && request.status == 200 && LAPI.Ajax.checkEdit (request);
          } catch (some_error) {
            failure (request, some_error);
            return;
          }
          if (successful)
            success (request);
          else
            failure (request);
        }
      }
  );
}; // end LAPI.Ajax.submitEdit
  
LAPI.Ajax.apiGet = function (action, params, success, failure)
{
  if (!failure || typeof (failure) != 'function') failure = function () {};
  if (!success || typeof (success) != 'function')
    throw new Error ('No success function supplied for API call '
                     + action + ' with arguments ' + params);
  request = LAPI.Ajax.getRequest ();
  if (!request) {
    failure (request);
    return;
  }
  var uri = wgServer + wgScriptPath + '/api.php';
  if (action)
    uri = uri + '?action=' + action + '&format=json';
  else
    uri = uri + '?format=json';
  if (params != null) {
    if (typeof (params) == 'string') {
      uri = uri + (params.charAt (0) == '&' ? "" : '&') + params; // Must already be encoded!
    } else {
      for (var param in params) {
        if (param != 'format') {
          uri = uri + '&' + param;
          if (params[param] != null) uri = uri + '=' + encodeURIComponent (params[param]);
        }
      }
    }
  }
  request.open ('GET', uri, true);
  request.setRequestHeader ('Pragma', 'cache=yes');
  request.setRequestHeader ('Cache-Control', 'no-transform');
  request.onreadystatechange =
    function ()
    {
      if (request.readyState != 4) return; // Wait until the request has completed.
      if (request.status != 200) {
        failure (request);
      } else {
        if (!request.responseText || request.responseText.charAt (0) != '{') {
          failure (request);
        } else {
          success (request, eval ('(' + request.responseText + ')'));
        }
      }
    };
  request.send (null);
}; // end LAPI.Ajax.getAPI

LAPI.Ajax.parseWikitext = function (wikitext, success, failure, as_preview, user_language, on_page)
{
  if (!failure || typeof (failure) != 'function') failure = function () {};
  if (!success || typeof (success) != 'function')
    throw new Error ('No success function supplied for parseWikitext');
  LAPI.Ajax.apiGet (
      'parse'
    , {  pst  : null // Do the pre-save-transform: Pipe magic, tilde expansion, etc.
       , text :
         (as_preview ? '\<div style="border:1px solid red; padding:0.5em;"\>'
                       + '\<div class="previewnote"\>'
                       + '\{\{MediaWiki:Previewnote/' + (user_language || wgUserLanguage) +'\}\}'
                       + '\<\/div>\<div\>\n'
                     : "")
         + wikitext
         + (as_preview ? '\<\/div\>\<\/div\>' : "")
       , title: on_page || wgPageName || "API"
       , prop : 'text'
      }
    , function (req, json_result, failureFunc)
      {
        // Success.
        if (!json_result || !json_result.parse || !json_result.parse.text) {
          failureFunc (req, json_result);
          return;
        }
        success (json_result.parse.text['*'], failureFunc);
      }
    , failure
  );
}; // end LAPI.Ajax.parseWikitext

LAPI.Ajax.injectSpinner = injectSpinner;
LAPI.Ajax.removeSpinner = removeSpinner;

} // end if (guard)

if (typeof (LAPI.Pos) == 'undefined') {
  
LAPI.Pos =
{
  // Returns the global coordinates of the mouse pointer within the document.
  mousePosition : function (evt)
  {
    if (!evt || (typeof (evt.pageX) == 'undefined' && typeof (evt.clientX) == 'undefined'))
      // No way to calculate a mouse pointer position
      return null;
    if (typeof (evt.pageX) != 'undefined')
      return { x : evt.pageX, y : evt.pageY };
      
    var offset      = LAPI.Pos.scrollOffset ();
    var mouse_delta = LAPI.Pos.mouse_offset ();
    var coor_x = evt.clientX + offset.x - mouse_delta.x;
    var coor_y = evt.clientY + offset.y - mouse_delta.y;
    return { x : coor_x, y : coor_y };
  },
  
  // Operations on document level:
  
  // Returns the scroll offset of the whole document (in other words, the coordinates
  // of the top left corner of the viewport).
  scrollOffset : function ()
  {
    return {x : LAPI.Pos.getScroll ('Left'), y : LAPI.Pos.getScroll ('Top') };
  },
  
  getScroll : function (what)
  {
    var s = 'scroll' + what;
    return (document.documentElement ? document.documentElement[s] : 0)
           || document.body[s] || 0;
  },
  
  // Returns the size of the viewport (result.x is the width, result.y the height).
  viewport : function ()
  {
    return {x : LAPI.Pos.getViewport ('Width'), y : LAPI.Pos.getViewport ('Height') };
  },
  
  getViewport : function (what)
  {
    if (   LAPI.Browser.is_opera_95 && what == 'Height'
        || LAPI.Browser.is_safari && !document.evaluate)
      return window['inner' + what];
    var s = 'client' + what;
    if (LAPI.Browser.is_opera) return document.body[s];
    return (document.documentElement ? document.documentElement[s] : 0)
           || document.body[s] || 0;
  },
  
  // Operations on DOM nodes
  
  position : function (node)
  {
    var t = 0, l = 0;
    do {
      t = t + (node.offsetTop  || 0);
      l = l + (node.offsetLeft || 0);
      node = node.offsetParent;
    } while (node);
    if (LAPI.Browser.is_mac && typeof (document.body.leftMargin) != 'undefined') {
      l = l + document.body.leftMargin;
      t = t + document.body.topMargin;
    }
    return {x : l, y : t};
  },

  isWithin : function (node, x, y)
  {
    if (!node || !node.parentNode) return false;
    var pos = LAPI.Pos.position (node);
    return    (x == null || x >= pos.x && x < pos.x + node.offsetWidth)
           && (y == null || y >= pos.y && y < pos.y + node.offsetHeight);
  },
  
  // Private:
  
  // IE has some strange offset...
  mouse_offset : function ()
  {
    if (LAPI.Browser.is_ie) {
      var doc_elem = document.documentElement;
      if (doc_elem) {
        if (typeof (doc_elem.getBoundingClientRect) == 'function') {
          var tmp = doc_elem.getBoundingClientRect ();
          return {x : tmp.left, y : tmp.top};
        } else {
          return {x : doc_elem.clientLeft, y : doc_elem.clientTop};
        }
      }
    }
    return {x: 0, y : 0};
  }

}; // end LAPI.Pos

} // end if (guard)

if (typeof (LAPI.Evt) == 'undefined') {
  
LAPI.Evt =
{
  listenTo : function (object, node, evt, f, capture)
  {
    var listener = LAPI.Evt.makeListener (object, f);
    LAPI.Evt.attach (node, evt, listener, capture);
  },
 
  attach : function (node, evt, f, capture)
  {
    if (node.attachEvent) node.attachEvent ('on' + evt, f);
    else if (node.addEventListener) node.addEventListener (evt, f, capture);
    else node['on' + evt] = f;
  },
 
  remove : function (node, evt, f, capture)
  {
    if (node.detachEvent) node.detachEvent ('on' + evt, f);
    else if (node.removeEventListener) node.removeEventListener (evt, f, capture);
    else node['on' + evt] = null;
  },
 
  makeListener : function (obj, listener)
  {
    // Some hacking around to make sure 'this' is set correctly
    var object = obj, f = listener;
    return function (evt) { return f.apply (object, [evt || window.event]); }
    // Alternative implementation:
    // var f = listener.bind (obj);
    // return function (evt) { return f (evt || window.event); };
  },

  kill : function (evt)
  {
    if (typeof (evt.preventDefault) == 'function') {
      evt.stopPropagation ();
      evt.preventDefault (); // Don't follow the link
    } else if (typeof (evt.cancelBubble) != 'undefined') { // IE...
      evt.cancelBubble = true;
    }
    return false; // Don't follow the link (IE)
  }

}; // end LAPI.Evt

} // end if (guard)

if (typeof (LAPI.Edit) == 'undefined') {

LAPI.Edit = function () {this.initialize.apply (this, arguments);};

LAPI.Edit.SAVE    = 1;
LAPI.Edit.PREVIEW = 2;
LAPI.Edit.REVERT  = 4;
LAPI.Edit.CANCEL  = 8;

LAPI.Edit.prototype =
{
  initialize : function (initial_text, columns, rows, labels, handlers)
  {
    var my_labels =
      {box : null, preview : null, save : 'Save', cancel : 'Cancel', nullsave : null, revert : null, post: null};
    if (labels) my_labels = Object.merge (labels, my_labels);
    this.labels = my_labels;
    this.timestamp = (new Date ()).getTime ();
    this.id = 'simpleedit_' + this.timestamp;
    this.view = LAPI.make ('div', {id : this.id}, {marginRight: '1em'});
    // Somehow, the textbox extends beyond the bounding box of the view. Don't know why, but
    // adding a small margin fixes the layout more or less.
    if (my_labels.box) {
      var label = LAPI.make ('div');
      label.appendChild (LAPI.DOM.makeLabel (null, my_labels.box));
      this.view.appendChild (label);
    }
    this.form =
      LAPI.make (
          'form'
        , { id      : 'simple_edit_form_' + this.timestamp
           ,action  : ""
           ,onsubmit: (function () {})
          }
      );
    this.textarea =
      LAPI.make (
          'textarea'
        , { id   : 'simpleedit_text_' + this.timestamp
           ,cols : columns
           ,rows : rows
           ,value: (initial_text ? initial_text.toString () : "")
          }
      );
    LAPI.Evt.attach (this.textarea, 'keyup', LAPI.Evt.makeListener (this, this.text_changed));
    // Catch cut/copy/paste through the context menu. Some browsers support oncut, oncopy,
    // onpaste events for this, but since that's only IE, FF 3, Safari 3, and Chrome, we
    // cannot rely on this. Instead, we check again as soon as we leave the textarea. Only
    // minor catch is that on FF 3, the next focus target is determined before the blur event
    // fires. Since in practice save will always be enabled, this shouldn't be a problem.
    LAPI.Evt.attach (this.textarea, 'mouseout', LAPI.Evt.makeListener (this, this.text_changed));
    LAPI.Evt.attach (this.textarea, 'blur', LAPI.Evt.makeListener (this, this.text_changed));
    this.form.appendChild (this.textarea);
    this.form.appendChild (LAPI.make ('br'));
    this.preview_section =
      LAPI.make ('div', null, {borderBottom: '1px solid #8888aa', display: 'none'});
    this.view.insertBefore (this.preview_section, this.view.firstChild);
    this.save =
      LAPI.DOM.makeButton
        ('simpleedit_save_' + this.timestamp, my_labels.save, LAPI.Evt.makeListener (this, this.do_save));
    this.form.appendChild (this.save);
    if (my_labels.preview) {
      this.preview =
        LAPI.DOM.makeButton
          ('simpleedit_preview_' + this.timestamp, my_labels.preview, LAPI.Evt.makeListener (this, this.do_preview));
      this.form.appendChild (this.preview);
    }
    this.cancel =
      LAPI.DOM.makeButton
        ('simpleedit_cancel_' + this.timestamp, my_labels.cancel, LAPI.Evt.makeListener (this, this.do_cancel));
    this.form.appendChild (this.cancel);
    this.view.appendChild (this.form);
    if (my_labels.post) {
      this.post_text = LAPI.DOM.setContent (LAPI.make ('div'), my_labels.post);
      this.view.appendChild (this.post_text);
    }
    if (handlers) Object.merge (handlers, this);
    if (typeof (this.ongettext) != 'function')
      this.ongettext = function (text) { return text;}; // Default: no modifications
    this.current_mask = LAPI.Edit.SAVE + LAPI.Edit.PREVIEW + + LAPI.Edit.REVERT + LAPI.Edit.CANCEL;
    if ((!initial_text || initial_text.trim ().length == 0) && this.preview)
      this.preview.disabled = true;
    if (typeof (this.onrevert) == 'function' && my_labels.revert) {
      this.revert = 
        LAPI.DOM.makeButton
          ('simpleedit_revert_' + this.timestamp, my_labels.revert, LAPI.Evt.makeListener (this, this.do_revert));
      this.form.insertBefore (this.revert, this.cancel);
    }
  },
  
  getView : function ()
  {
    return this.view;
  },
  
  getText : function ()
  {
    return this.ongettext (this.textarea.value);
  },
  
  setText : function (text)
  {
    this.textarea.value = text;
    this.text_changed ();
  },
  
  hidePreview : function ()
  {
    this.preview_section.style.display = 'none';
    if (this.onpreview) this.onpreview (this);
  },

  showPreview : function ()
  {
    this.preview_section.style.display = "";
    if (this.onpreview) this.onpreview (this);
  },

  setPreview : function (html)
  {
    if (html.nodeName) {
      LAPI.DOM.removeChildren (this.preview_section);
      this.preview_section.appendChild (html);
    } else {
      this.preview_section.innerHTML = html;
    }
  },
  
  busy : function (show)
  {
    if (show)
      LAPI.Ajax.injectSpinner (this.cancel, this.id + '_spinner');
    else
      LAPI.Ajax.removeSpinner (this.id + '_spinner');
  },
  
  do_save : function (evt)
  {
    if (this.onsave) this.onsave (this);
    return true;
  },
  
  do_revert : function (evt)
  {
    if (this.onrevert) this.setText (this.onrevert (this));
    return true;
  },

  do_cancel : function (evt)
  {
    if (this.oncancel) this.oncancel (this);
    return true;
  },
  
  do_preview : function (evt)
  {
    var self = this;
    this.busy (true);
    LAPI.Ajax.parseWikitext (
        this.getText ()
      , function (text, failureFunc)
        {
          self.busy (false);
          self.setPreview (text);
          self.showPreview ();
        }
      , function (req, json_result)
        {
          // Error. TODO: user feedback?
          self.busy (false);
        }
      , true
      , wgUserLanguage || null
      , wgPageName || null
    );
    return true;
  },

  enable : function (bit_set)
  {
    this.current_mask = bit_set;
    this.save.disabled = ((bit_set & LAPI.Edit.SAVE) == 0);
    this.cancel.disabled = ((bit_set & LAPI.Edit.CANCEL) == 0);
    if (this.preview) {
      if ((bit_set & LAPI.Edit.PREVIEW) == 0)
        this.preview.disabled = true;
      else
        this.text_changed ();
    }
    if (this.revert) this.revert.disabled = ((bit_set & LAPI.Edit.REVERT) == 0);
  },

  text_changed : function (evt)
  {
    var text = this.textarea.value;
    text = text.trim ();
    var length = text.length;   
    if (this.preview && (this.current_mask & LAPI.Edit.PREVIEW) != 0) {
      // Preview is basically enabled
      this.preview.disabled = (length <= 0);
    }
    if (this.labels.nullsave) {
      if (length > 0) {
        this.save.value = this.labels.save;
      } else {
        this.save.value = this.labels.nullsave;
      }
    }
    return true;
  }

}; // end LAPI.Edit

} // end if (guard)

// </source>