MediaWiki:Gadget-HotCat.js

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//<source lang="javascript">

window.hotcat_use_category_links = false;

/*
  HotCat V2.19

  Ajax-based simple Category manager. Allows adding/removing/changing categories on a page view.
  Supports multiple category changes, as well as redirect and disambiguation resolution. Also
  plugs into the upload form. Search engines to use for the suggestion list are configurable, and
  can be selected interactively.

  Documentation: https://commons.wikimedia.org/wiki/Help:Gadget-HotCat
  List of main authors: https://commons.wikimedia.org/wiki/Help:Gadget-HotCat/Version_history

  License: Quadruple licensed GFDL, GPL, LGPL and Creative Commons Attribution 3.0 (CC-BY-3.0)

  Choose whichever license of these you like best :-)
*/

/*
  This code is MW version safe. It should run on any MediaWiki installation >= MW 1.15. Note: if
  running on MW >= 1.17 configured with $wgLegacyJavaScriptGlobals != true, it will still force
  publishing the wg* globals in the window object. Note that HotCat is supposed to run with or
  without jQuery, and also on older installations that do not yet have window.mediaWiki. If you
  use any of these newer features, make sure you qualify them by checking whether they exist at
  all, and by providing some meaningful fallback implementation if not. To start itself, HotCat
  uses either jQuery(document).ready(), if available (preferred), or the old addOnloadHook().
  If neither exists, HotCat won't start.
*/
if ((typeof wgAction == 'undefined') && window.mediaWiki && window.mediaWiki.config) { // Compatibility hack
  window.wgAction = window.mediaWiki.config.get('wgAction');
}
if (typeof (window.HotCat) == 'undefined' && wgAction != 'edit') { // Guard against double inclusions, and inactivate on edit pages

// Configuration stuff.
window.HotCat = {
  isCommonsVersion : false
    // If you copy HotCat to your wiki, you should set this to false!

  // Localize these messages to the main language of your wiki.
  ,messages :
    { cat_removed  : 'removed ['+'[Category:$1]]'
     ,template_removed  : 'removed {{['+'[Category:$1]]}}'
     ,cat_added    : 'added ['+'[Category:$1]]'
     ,cat_keychange: 'new key for ['+'[Category:$1]]: "$2"' // $2 is the new key
     ,cat_notFound : 'Category "$1" not found'
     ,cat_exists   : 'Category "$1" already exists; not added.'
     ,cat_resolved : ' (redirect ['+'[Category:$1]] resolved)'
     ,uncat_removed: 'removed {'+'{uncategorized}}'
     ,separator    : '; '
     ,prefix       : ""
        // Some text to prefix to the edit summary.
     ,using        : ' using [[commons:Help:Gadget-HotCat|HotCat]]'
        // Some text to append to the edit summary. Named 'using' for historical reasons. If you prefer
        // to have a marker at the front, use prefix and set this to the empty string.
     ,multi_change : '$1 categories'
        // $1 is replaced by a number. If your language has several plural forms (c.f. [[:en:Dual (grammatical form)]]),
        // you can set this to an array of strings suitable for passing to mw.language.configPlural().
        // If that function doesn't exist, HotCat will simply fall back to using the last
        // entry in the array.
     ,commit       : 'Save'
        // Button text. Localize to wgContentLanguage here; localize to wgUserLanguage in a subpage,
        // see localization hook below.
     ,ok           : 'OK'
        // Button text. Localize to wgContentLanguage here; localize to wgUserLanguage in a subpage,
        // see localization hook below.
     ,cancel       : 'Cancel'
        // Button text. Localize to wgContentLanguage here; localize to wgUserLanguage in a subpage,
        // see localization hook below.
     ,multi_error  : 'Could not retrieve the page text from the server. Therefore, your category changes '
                    +'cannot be saved. We apologize for the inconvenience.'
        // Localize to wgContentLanguage here; localize to wgUserLanguage in a subpage,
        // see localization hook below.
     ,short_catchange : null
        // Defaults to '[[' + category_canonical + ':$1]]'. Can be overridden if in the short edit summaries
        // not the standard category name should be used but, say, a shorter namespace alias. $1 is replaced
        // by a category name.
    }
 ,category_regexp    : '[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]'
   // Regular sub-expression matching all possible names for the category namespace. Is automatically localized
   // correctly if you're running MediaWiki 1.16 or later. Otherwise, set it appropriately, e.g. at the German
   // Wikipedia, use '[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]|[Kk][Aa][Tt][Ee][Gg][Oo][Rr][Ii][Ee]', or at the
   // Chinese Wikipedia, use '[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]|分类|分類'. Note that namespaces are case-
   // insensitive!
 ,category_canonical : 'Category'
   // The standard category name on your wiki. Is automatically localized correctly if you're running
   // MediaWiki 1.16 or later; otherwise, set it to the preferred category name (e.g., "Kategorie").
 ,categories         : 'Categories'
   // Plural of category_canonical.
 ,disambig_category  : 'Disambiguation'
   // Any category in this category is deemed a disambiguation category; i.e., a category that should not contain
   // any items, but that contains links to other categories where stuff should be categorized. If you don't have
   // that concept on your wiki, set it to null. Use blanks, not underscores.
 ,redir_category     : 'Category redirects'
   // Any category in this category is deemed a (soft) redirect to some other category defined by the first link
   // to another category. If your wiki doesn't have soft category redirects, set this to null.
 ,links : {change: '(±)', remove: '(−)', add: '(+)', restore: '(×)', undo: '(×)', down: '(↓)', up: '(↑)'}
   // The little modification links displayed after category names.
 ,tooltips : {
    change:  'Modify'
   ,remove:  'Remove'
   ,add:     'Add a new category'
   ,restore: 'Undo changes'
   ,undo:    'Undo changes'
   ,down:    'Open for modifying and display subcategories'
   ,up:      'Open for modifying and display parent categories'
  }
   // The tooltips for the above links
 ,addmulti           : '<span>+<sup>+</sup></span>'
   // The HTML content of the "enter multi-mode" link at the front.
 ,multi_tooltip      : 'Modify several categories'
   // Tooltip for the "enter multi-mode" link
 ,disable            :
    function () { // Return true to disable HotCat. HotCat guarantees that the wg* globals exist here.
      var ns = wgNamespaceNumber;
      return (   ns < 0   // Special pages; Special:Upload is handled differently
              || ns === 10 // Templates
              || ns === 8  // MediaWiki
              || ns === 6 && wgArticleId === 0 // Non-existing file pages
              || ns === 2 && /\.(js|css)$/.test(wgTitle) // User scripts
              || typeof (wgNamespaceIds) != 'undefined'
                 && (   ns === wgNamespaceIds['creator']
                     || ns === wgNamespaceIds['timedtext']
                     || ns === wgNamespaceIds['institution']
                    )
             );
    }
 ,uncat_regexp : /\{\{\s*([Uu]ncat(egori[sz]ed( image)?)?|[Nn]ocat|[Nn]eedscategory)[^}]*\}\}\s*(<\!--.*?--\>)?/g
   // A regexp matching a templates used to mark uncategorized pages, if your wiki does have that.
   // If not, set it to null.
 ,existsYes    : '//upload.wikimedia.org/wikipedia/commons/thumb/b/be/P_yes.svg/20px-P_yes.svg.png'
 ,existsNo     : '//upload.wikimedia.org/wikipedia/commons/thumb/4/42/P_no.svg/20px-P_no.svg.png'
   // The images used for the little indication icon. Should not need changing.
 ,template_regexp    : '[Tt][Ee][Mm][Pp][Ll][Aa][Tt][Ee]'
   // Regexp to recognize templates. Like "category" above; autolocalized for MW 1.16+, otherwise set manually here.
   // On the German Wikipedia, you might use '[Tt][Ee][Mm][Pp][Ll][Aa][Tt][Ee]|[Vv][Oo][Rr][Ll][Aa][Gg][Ee]'.
 ,template_categories : {}
   // a list of categories which can be removed by removing a template
   // key: the category without namespace
   // value: A regexp matching the template name, again without namespace
   // If you don't have this at your wiki, or don't want this, set it to an empty object {}.
 ,engine_names : {
    searchindex : 'Search index'
   ,pagelist    : 'Page list'
   ,combined    : 'Combined search'
   ,subcat      : 'Subcategories'
   ,parentcat   : 'Parent categories'
  }
   // Names for the search engines
 ,capitalizePageNames : true
   // Set to false if your wiki has case-sensitive page names. MediaWiki has two modes: either the first letter
   // of a page is automatically capitalized ("first-letter"; Category:aa == Category:Aa), or it isn't
   // ("case-sensitive"; Category:aa != Category:Aa). It doesn't currently have a fully case-insensitive mode
   // (which would mean Category:aa == Category:Aa == Category:AA == Category:aA)
   // HotCat tries to set this correctly automatically using an API query. It's still a good idea to manually
   // configure it correctly; either directly here if you copied HotCat, or in the local configuration file
   // MediaWiki:Gadget-HotCat.js/local_defaults if you hotlink to the Commons-version, to ensure it is set even
   // if that API query should fail for some strange reason.
 ,upload_disabled : false
   // If upload_disabled is true, HotCat will not be used on the Upload form.
 ,blacklist : null
   // Single regular expression matching blacklisted categories that cannot be changed or
   // added using HotCat. For instance /\bstubs?$/ (any category ending with the word "stub"
   // or "stubs"), or /(\bstubs?$)|\bmaintenance\b/ (stub categories and any category with the
   // word "maintenance" in its title.

  // Stuff changeable by users:
 ,bg_changed : '#F8CCB0'
   // Background for changed categories in multi-edit mode. Default is a very light salmon pink.
 ,no_autocommit : false
   // If true, HotCat will never automatically submit changes. HotCat will only open an edit page with
   // the changes; users must always save explicitly.
 ,suggest_delay : 100
   // Time, in milliseconds, that HotCat waits after a keystroke before making a request to the
   // server to get suggestions.
 ,editbox_width : 40
   // Default width, in characters, of the text input field.
 ,suggestions : 'combined'
   // One of the engine_names above, to be used as the default suggestion engine.
 ,fixed_search : false
   // If true, always use the default engine, and never display a selector.
 ,use_up_down : true
   // If false, do not display the "up" and "down" links
 ,list_size : 5
   // Default list size
 ,single_minor : true
   // If true, single category changes are marked as minor edits. If false, they're not.
 ,dont_add_to_watchlist : false
   // If true, never add a page to the user's watchlist. If false, pages get added to the watchlist if
   // the user has the "Add pages I edit to my watchlist" or the "Add pages I create to my watchlist"
   // options in his or her preferences set.
};

(function () { // Local scope to avoid polluting the global namespace with declarations

  // Backwards compatibility stuff. We want HotCat to work with either wg* globals, or with mw.config.get().
  // Our "solution" is to publish the wg* globals if they're not already published.
  if (window.mediaWiki && window.mediaWiki.config) {
    var globals = window.mediaWiki.config.get();
    if (globals && globals !== window) {
      for (var k in globals) window[k] = globals[k];
      window.mediaWiki.config = new window.mediaWiki.Map(true); // Make config point to window again.
    }
    globals = null;
  }
  // More backwards compatibility. We have four places where we test for the browser: once for
  // Safari < 3.0, once for WebKit (Chrome or Safari, any versions), and twice for IE <= 6.
  var ua = navigator.userAgent.toLowerCase();
  var is_ie6 = /msie ([0-9]{1,}[\.0-9]{0,})/.exec(ua) != null && parseFloat(RegExp.$1) <= 6.0;
  var is_webkit = /applewebkit\/\d+/.test(ua) && ua.indexOf ('spoofer') < 0;  
  // And even more compatbility. HotCat was developed without jQuery, and anyway current jQuery
  // (1.7.1) doesn't seem to support in jquery.getJSON() or jQuery.ajax() the automatic
  // switching from GET to POST requests if the query arguments would make the uri too long.
  // (IE has a hard limit of 2083 bytes, and the servers may have limits around 4 or 8kB.)
  //    Anyway, HotCat is supposed to run on wikis without jQuery, so we'd have to supply some
  // ajax routines ourselves in any case. We can't rely on the old sajax_init_object(), newer
  // MW versions (>= 1.19) might not have it.
  var getJSON = (function () {
    function getRequest () {
      var request = null;
      try {
        request = new window.XMLHttpRequest();
      } catch (anything) {
        if (window.ActiveXObject) {
          try {
            request = new window.ActiveXObject('Microsoft.XMLHTTP');
          } catch (any) {
          }
        } // end if IE
      } // end try-catch
      return request;
    }

    return function (settings) {
      var req = getRequest();
      if (!req && settings && settings.error) settings.error (req);
      if (!req || !settings || !settings.uri) return req;
      var uri = armorUri (settings.uri);
      var args = settings.data || null;
      var method;
      if (args && uri.length + args.length + 1 > 2000) {
        // We lose caching, but at least we can make the request
        method = 'POST';
        req.setRequestHeader ('Content-Type', 'application/x-www-form-urlencoded');
      } else {
        method = 'GET';
        if (args) uri += '?' + args;
        args = null;
      }
      req.open (method, uri, true);
      req.onreadystatechange = function () {
        if (req.readyState != 4) return;
        if (req.status != 200 || !req.responseText || !(/^\s*[\{\[]/.test(req.responseText))) {
          if (settings.error) settings.error (req);
        } else {
          if (settings.success) settings.success (eval ('(' + req.responseText + ')'));
        }          
      };
      req.setRequestHeader ('Pragma', 'cache=yes');
      req.setRequestHeader ('Cache-Control', 'no-transform');
      req.send (args);
      return req;
    };
  })();

  function armorUri (uri) {
    // Avoid protocol-relative URIs, IE7 has a bug with them in Ajax calls
    if (uri.length >= 2 && uri.substring(0, 2) == '//') return document.location.protocol + uri;
    return uri;
  }

  function LoadTrigger (needed) {
    this.queue = [];
    this.toLoad = needed;
  };
  LoadTrigger.prototype = {
    register : function (callback) {
      if (this.toLoad <= 0) {
        callback (); // Execute directly
      } else {
        this.queue[this.queue.length] = callback;
      }
    },

    loaded : function () {
      if (this.toLoad > 0) {
        this.toLoad--;
        if (this.toLoad === 0) {
          // Run queued callbacks once
          for (var i = 0; i < this.queue.length; i++) this.queue[i]();
          this.queue = [];
        }
      }
    }

  };

  var setupCompleted = new LoadTrigger(1);
  // Used to run user-registered code once HotCat is fully set up and ready.
  HotCat.runWhenReady = function (callback) {setupCompleted.register(callback);};

  var loadTrigger = new LoadTrigger(2);
  // Used to delay running the HotCat setup until /local_defaults and localizations have been loaded.

  function load (uri) {
    var head = document.getElementsByTagName ('head')[0];
    var s = document.createElement ('script');
    s.setAttribute ('src', armorUri(uri));
    s.setAttribute ('type', 'text/javascript');
    var done = false;

    function afterLoad () {
      if (done) return;
      done = true;
      s.onload = s.onreadystatechange = s.onerror = null; // Properly clean up to avoid memory leaks in IE
      if (head && s.parentNode) head.removeChild (s);
      loadTrigger.loaded();
    }

    s.onload = s.onreadystatechange = function () { // onreadystatechange for IE, onload for all others
      if (done) return;
      if (!this.readyState || this.readyState === 'loaded' || this.readyState === 'complete') {
        afterLoad ();
      }
    };
    s.onerror = afterLoad; // Clean up, but otherwise ignore errors
    head.insertBefore (s, head.firstChild); // appendChild may trigger bugs in IE6 here
  }

  function loadJS (page) {
    load (wgServer + wgScript + '?title=' + encodeURIComponent (page) + '&action=raw&ctype=text/javascript');
  }

  function loadURI (href) {
    var url = href;
    if (url.substring (0, 2) == '//') {
      url = window.location.protocol + url;
    } else if (url.substring (0, 1) == '/') {
      url = wgServer + url;
    }
    load (url);
  }

  if (HotCat.isCommonsVersion && wgServer.indexOf ('/commons') < 0) {
    // We're running in some other wiki, which hotlinks to the Commons version. The other wiki can put local settings
    // in this file to override the Commons settings for all user languages. For instance, if on your wiki people do
    // not like automatic saving, you'd add in that file the line HotCat.no_autocommit = true; If you hotlink, you
    // *must* adapt HotCat.categories in this file to the local translation in wgContentLanguage of your wiki of the
    // English plural "Categories", and you should provide translations in wgContentLanguage of your wiki of all messages,
    // tooltips, and of the engine names.
    loadJS ('MediaWiki:Gadget-HotCat.js/local_defaults');
  } else {
    loadTrigger.loaded();
  }

  if (wgUserLanguage != 'en') {
    // Localization hook to localize HotCat messages, tooltips, and engine names for wgUserLanguage.
    if (window.hotcat_translations_from_commons && wgServer.indexOf ('/commons') < 0) {
      loadURI (
        ((wgServer.indexOf( "https://secure.wikimedia.org") === 0)
           ? '/wikipedia/commons/w/index.php?title='
           : '//commons.wikimedia.org/w/index.php?title='
        )
        + 'MediaWiki:Gadget-HotCat.js/' + wgUserLanguage
        + '&action=raw&ctype=text/javascript&smaxage=21600&maxage=86400'
      );
    } else {
      // Load translations locally
      loadJS ('MediaWiki:Gadget-HotCat.js/' + wgUserLanguage);
    }
  } else {
    loadTrigger.loaded();
  }

  // No further changes should be necessary here.

  // The following regular expression strings are used when searching for categories in wikitext.
  var wikiTextBlank   = '[\\t _\\xA0\\u1680\\u180E\\u2000-\\u200A\\u2028\\u2029\\u202F\\u205F\\u3000]+';
  var wikiTextBlankRE = new RegExp (wikiTextBlank, 'g');
  // Regexp for handling blanks inside a category title or namespace name.
  // See http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Title.php?revision=104051&view=markup#l2722
  // See also http://www.fileformat.info/info/unicode/category/Zs/list.htm
  //   MediaWiki collapses several contiguous blanks inside a page title to one single blank. It also replace a
  // number of special whitespace characters by simple blanks. And finally, blanks are treated as underscores.
  // Therefore, when looking for page titles in wikitext, we must handle all these cases.
  //   Note: we _do_ include the horizontal tab in the above list, even though the MediaWiki software for some reason
  // appears to not handle it. The zero-width space \u200B is _not_ handled as a space inside titles by MW.
  var wikiTextBlankOrBidi = '[\\t _\\xA0\\u1680\\u180E\\u2000-\\u200B\\u200E\\u200F\\u2028-\\u202F\\u205F\\u3000]*';
  // Whitespace regexp for handling whitespace between link components. Including the horizontal tab, but not \n\r\f\v:
  // a link must be on one single line.
  //   MediaWiki also removes Unicode bidi override characters in page titles (and namespace names) completely.
  // This is *not* handled, as it would require us to allow any of [\u200E\u200F\u202A-\u202E] between any two
  // characters inside a category link. It _could_ be done though... We _do_ handle strange spaces, including the
  // zero-width space \u200B, and bidi overrides between the components of a category link (adjacent to the colon,
  // or adjacent to and inside of "[[" and "]]").

  // First auto-localize the regexps for the category and the template namespaces.
  if (typeof (wgFormattedNamespaces) != 'undefined') {
    function autoLocalize (namespaceNumber, fallback) {
      function create_regexp_str (name)
      {
        if (!name || name.length === 0) return "";
        var regex_name = "";
        for (var i = 0; i < name.length; i++){
          var initial = name.substr (i, 1);
          var ll = initial.toLowerCase ();
          var ul = initial.toUpperCase ();
          if (ll == ul){
            regex_name += initial;
          } else {
            regex_name += '[' + ll + ul + ']';
          }
        }
        return regex_name.replace(/([\\\^\$\.\?\*\+\(\)])/g, '\\$1')
                         .replace (wikiTextBlankRE, wikiTextBlank);
      }

      fallback = fallback.toLowerCase();
      var canonical  = wgFormattedNamespaces["" + namespaceNumber].toLowerCase();
      var regexp     = create_regexp_str (canonical);
      if (fallback && canonical != fallback) regexp += '|' + create_regexp_str (fallback);
      for (var cat_name in wgNamespaceIds) {
        if (   typeof (cat_name) == 'string'
            && cat_name.toLowerCase () != canonical
            && cat_name.toLowerCase () != fallback
            && wgNamespaceIds[cat_name] == namespaceNumber)
        {
          regexp += '|' + create_regexp_str (cat_name);
        }
      }
      return regexp;
    }

    if (wgFormattedNamespaces['14']) {
      HotCat.category_canonical = wgFormattedNamespaces['14'];
      HotCat.category_regexp = autoLocalize (14, 'category');
    }
    if (wgFormattedNamespaces['10']) {
      HotCat.template_regexp = autoLocalize (10, 'template');
    }
  }

  // Utility functions. Yes, this duplicates some functionality that also exists in other places, but
  // to keep this whole stuff in a single file not depending on any other on-wiki Javascripts, we re-do
  // these few operations here.
  function bind (func, target) {
    var f = func, tgt = target;
    return function () { return f.apply (tgt, arguments); };
  }
  function make (arg, literal) {
    if (!arg) return null;
    return literal ? document.createTextNode (arg) : document.createElement (arg);
  }
  function param (name, uri) {
    if (typeof (uri) == 'undefined' || uri === null) uri = document.location.href;
    var re = new RegExp ('[&?]' + name + '=([^&#]*)');
    var m = re.exec (uri);
    if (m && m.length > 1) return decodeURIComponent(m[1]);
    return null;
  }
  function title (href) {
    if (!href) return null;
    var script = wgScript + '?';
    if (href.indexOf (script) === 0 || href.indexOf (wgServer + script) === 0 || wgServer.substring(0, 2) == '//' && href.indexOf (document.location.protocol + wgServer + script) === 0) {
      // href="/w/index.php?title=..."
      return param ('title', href);
    } else {
      // href="/wiki/..."
      var prefix = wgArticlePath.replace ('$1', "");
      if (href.indexOf (prefix) != 0) prefix = wgServer + prefix; // Fully expanded URL?
      if (href.indexOf (prefix) != 0 && prefix.substring(0, 2) == '//') prefix = document.location.protocol + prefix; // Protocol-relative wgServer?
      if (href.indexOf (prefix) === 0)
        return decodeURIComponent (href.substring (prefix.length));
    }
    return null;
  }
  function hasClass (elem, name) {
    return (' ' + elem.className + ' ').indexOf (' ' + name + ' ') >= 0;
  }
  function capitalize (str) {
    if (!str || str.length === 0) return str;
    return str.substr(0, 1).toUpperCase() + str.substr (1);
  }
  function wikiPagePath (pageName) {
    // Note: do not simply use encodeURI, it doesn't encode '&', which might break if wgArticlePath actually has the $1 in
    // a query parameter.
    return wgArticlePath.replace('$1', encodeURIComponent (pageName).replace(/%3A/g, ':').replace(/%2F/g, '/'));
  }
  function substitute (str, map) {
    // Replace $1, $2, or ${key1}, ${key2} by values from map. $$ is replaced by a single $.
    return str.replace(
      /\$(\$|(\d+)|\{([^{}]+)\})/g
     ,function (match, dollar, idx, key) {
        if (dollar == '$') return '$';
        var k = key || idx;
        var replacement = typeof (map[k]) === 'function' ? map[k](match, k) : map[k];
        return typeof (replacement) === 'string' ? replacement : (replacement || match);
      }
    );
  }

  // Text modification

  var findCatsRE =
    new RegExp ('\\[\\[' + wikiTextBlankOrBidi + '(?:' + HotCat.category_regexp + ')' + wikiTextBlankOrBidi + ':[^\\]]+\\]\\]', 'g');

  function replaceByBlanks (match) {
    return match.replace(/(\s|\S)/g, ' '); // /./ doesn't match linebreaks. /(\s|\S)/ does.
  }

  function find_category (wikitext, category, once) {
    var cat_regex = null;
    if(HotCat.template_categories[category]){
      cat_regex = new RegExp ('\\{\\{' + wikiTextBlankOrBidi + '(' + HotCat.template_regexp + '(?=' + wikiTextBlankOrBidi + ':))?' + wikiTextBlankOrBidi
                              + '(?:' + HotCat.template_categories[category] + ')'
                              + wikiTextBlankOrBidi + '(\\|.*?)?\\}\\}', 'g'
                             );
    } else {
      var cat_name  = category.replace(/([\\\^\$\.\?\*\+\(\)])/g, '\\$1');
      var initial   = cat_name.substr (0, 1);
      cat_regex = new RegExp ('\\[\\[' + wikiTextBlankOrBidi + '(' + HotCat.category_regexp + ')' + wikiTextBlankOrBidi + ':' + wikiTextBlankOrBidi
                              + (initial == '\\' || !HotCat.capitalizePageNames
                                 ? initial
                                 : '[' + initial.toUpperCase() + initial.toLowerCase() + ']')
                              + cat_name.substring (1).replace (wikiTextBlankRE, wikiTextBlank)
                              + wikiTextBlankOrBidi + '(\\|.*?)?\\]\\]', 'g'
                             );
    }
    if (once) return cat_regex.exec (wikitext);
    var copiedtext = wikitext.replace(/<\!--(\s|\S)*?--\>/g, replaceByBlanks)
                             .replace(/<nowiki\>(\s|\S)*?<\/nowiki>/g, replaceByBlanks);
    var result = [];
    var curr_match = null;
    while ((curr_match = cat_regex.exec (copiedtext)) != null) {
      result.push ({match : curr_match});
    }
    result.re = cat_regex;
    return result; // An array containing all matches, with positions, in result[i].match
  }

  var interlanguageRE = null;

  function change_category (wikitext, toRemove, toAdd, key, is_hidden) {

    function find_insertionpoint (wikitext) {
      var copiedtext = wikitext.replace(/<\!--(\s|\S)*?--\>/g, replaceByBlanks)
                               .replace(/<nowiki\>(\s|\S)*?<\/nowiki>/g, replaceByBlanks);
      // Search in copiedtext to avoid that we insert inside an HTML comment or a nowiki "element".
      var index = -1;
      findCatsRE.lastIndex = 0;
      while (findCatsRE.exec(copiedtext) != null) index = findCatsRE.lastIndex;
      if (index < 0) {
        // Find the index of the first interlanguage link...
        var match = null;
        if (!interlanguageRE) {
          // Approximation without API: interlanguage links start with 2 to 3 lower case letters, optionally followed by
          // a sequence of groups consisting of a dash followed by one or more lower case letters. Exceptions are "simple"
          // and "tokipona".
          match = /((^|\n\r?)(\[\[\s*(([a-z]{2,3}(-[a-z]+)*)|simple|tokipona)\s*:[^\]]+\]\]\s*))+$/.exec (copiedtext);
        } else {
          match = interlanguageRE.exec(copiedtext);
        }
        if (match) index = match.index;
        return {idx : index, onCat : false};
      }
      return {idx : index, onCat : index >= 0};
    }

    var summary   = [];
    var nameSpace = HotCat.category_canonical;
    var cat_point = -1; // Position of removed category;

    if (key) key = '|' + key;
    var keyChange = (toRemove && toAdd && toRemove == toAdd && toAdd.length > 0);
    if (toRemove && toRemove.length > 0) {
      var matches = find_category (wikitext, toRemove);
      if (!matches || matches.length === 0) {
        return {text: wikitext, 'summary': summary, error: HotCat.messages.cat_notFound.replace (/\$1/g, toRemove)};
      } else {
        var before = wikitext.substring (0, matches[0].match.index);
        var after  = wikitext.substring (matches[0].match.index + matches[0].match[0].length);
        if (matches.length > 1) {
          // Remove all occurrences in after
          matches.re.lastIndex = 0;
          after = after.replace (matches.re, "");
        }
        if (toAdd) {
          nameSpace = matches[0].match[1] || nameSpace;
          if (key == null) key = matches[0].match[2]; // Remember the category key, if any.
        }
        // Remove whitespace (properly): strip whitespace, but only up to the next line feed.
        // If we then have two linefeeds in a row, remove one. Otherwise, if we have two non-
        // whitespace characters, insert a blank.
        var i = before.length - 1;
        while (i >= 0 && before.charAt (i) != '\n' && before.substr (i, 1).search (/\s/) >= 0) i--;
        var j = 0;
        while (j < after.length && after.charAt (j) != '\n' && after.substr (j, 1).search (/\s/) >= 0)
          j++;
        if (i >= 0 && before.charAt (i) == '\n' && (after.length === 0 || j < after.length && after.charAt (j) == '\n'))
          i--;
        if (i >= 0) before = before.substring (0, i+1); else before = "";
        if (j < after.length) after = after.substring (j); else after = "";
        if (before.length > 0 && before.substring (before.length - 1).search (/\S/) >= 0
            && after.length > 0 && after.substr (0, 1).search (/\S/) >= 0)
          before += ' ';
        cat_point = before.length;
        wikitext = before + after;
        if (!keyChange) {
          if(HotCat.template_categories[toRemove]) {
            summary.push (HotCat.messages.template_removed.replace (/\$1/g, toRemove));
          } else {
            summary.push (HotCat.messages.cat_removed.replace (/\$1/g, toRemove));
          }
        }
      }
    }
    if (toAdd && toAdd.length > 0) {
      var matches = find_category (wikitext, toAdd);
      if (matches && matches.length > 0) {
        return {text: wikitext, 'summary': summary, error : HotCat.messages.cat_exists.replace (/\$1/g, toAdd)};
      } else {
        var onCat = false;
        if (cat_point < 0) {
          var point = find_insertionpoint (wikitext);
          cat_point = point.idx;
          onCat = point.onCat;
        } else {
          onCat = true;
        }
        var newcatstring = '[[' + nameSpace + ':' + toAdd + (key || "") + ']]';
        if (cat_point >= 0) {
          var suffix = wikitext.substring (cat_point);
          wikitext = wikitext.substring (0, cat_point) + (cat_point > 0 ? '\n' : "") + newcatstring + (!onCat ? '\n' : "");
          if (suffix.length > 0 && suffix.substr(0, 1) != '\n') {
            wikitext += '\n' + suffix;
          } else {
            wikitext += suffix;
          }
        } else {
          if (wikitext.length > 0 && wikitext.substr (wikitext.length - 1, 1) != '\n')
            wikitext += '\n';
          wikitext += '\n' + newcatstring;
        }
        if (keyChange) {
          var k = key || "";
          if (k.length > 0) k = k.substr (1);
          summary.push (substitute (HotCat.messages.cat_keychange, [null, toAdd, k]));
        } else {
          summary.push (HotCat.messages.cat_added.replace (/\$1/g, toAdd));
        }
        if (HotCat.uncat_regexp && !is_hidden) {
          var txt = wikitext.replace (HotCat.uncat_regexp, ""); // Remove "uncat" templates
          if (txt.length != wikitext.length) {
            wikitext = txt;
            summary.push (HotCat.messages.uncat_removed);
          }
        }
      }
    }
    return {text: wikitext, 'summary': summary, error: null};
  }

  // The real HotCat UI

  function evtKeys (e) {
    e = e || window.event || window.Event; // W3C, IE, Netscape
    var code = 0;
    if (typeof (e.ctrlKey) != 'undefined') { // All modern browsers
      // Ctrl-click seems to be overloaded in FF/Mac (it opens a pop-up menu), so treat cmd-click
      // as a ctrl-click, too.
      if (e.ctrlKey || e.metaKey) code |= 1;
      if (e.shiftKey) code |= 2;
    } else if (typeof (e.modifiers) != 'undefined') { // Netscape...
      if (e.modifiers & (Event.CONTROL_MASK | Event.META_MASK)) code |= 1;
      if (e.modifiers & Event.SHIFT_MASK) code |= 2;
    }
    return code;
  }
  function evtKill (e) {
    e = e || window.event || window.Event; // W3C, IE, Netscape
    if (typeof (e.preventDefault) != 'undefined') {
      e.preventDefault ();
      e.stopPropagation ();
    } else
      e.cancelBubble = true;
    return false;
  }
  function addEvent (node, evt, f, capture)
  {
    if (window.jQuery && (!capture || !node.addEventListener)) window.jQuery (node).bind (evt, f);
    else if (node.attachEvent) node.attachEvent ('on' + evt, f);
    else if (node.addEventListener) node.addEventListener (evt, f, capture);
    else node['on' + evt] = f;
  }

  var catLine      = null;
  var onUpload     = false;
  var editors      = [];

  var commitButton = null;
  var commitForm   = null;
  var multiSpan    = null;

  var pageText     = null;
  var pageTime     = null;
  var pageWatched  = false;
  var watchCreate  = false;
  var watchEdit    = false;
  var minorEdits   = false;
  var editToken    = null;

  var is_rtl       = false;
  var serverTime   = null;
  var lastRevId    = null;
  var pageTextRevId = null;
  var conflictingUser = null;

  var newDOM       = false; // true if MediaWiki serves the new UL-LI DOM for categories

  function setMultiInput () {
    if (commitButton || onUpload) return;
    commitButton = make ('input');
    commitButton.type  = 'button';
    commitButton.value = HotCat.messages.commit;
    commitButton.onclick = multiSubmit;
    if (multiSpan) {
      multiSpan.parentNode.replaceChild (commitButton, multiSpan);
    } else {
      catLine.appendChild (commitButton);
    }
  }

  function checkMultiInput () {
    if (!commitButton) return;
    var has_changes = false;
    for (var i = 0; i < editors.length; i++) {
      if (editors[i].state != CategoryEditor.UNCHANGED) {
        has_changes = true;
        break;
      }
    }
    commitButton.disabled = !has_changes;
  }

  function currentTimestamp () {
    var now = new Date();
    var ts  = "" + now.getUTCFullYear();
    function two (s) { return s.substr (s.length - 2); }
    ts = ts
      + two ('0' + (now.getUTCMonth() + 1))
      + two ('0' + now.getUTCDate())
      + two ('00' + now.getUTCHours())
      + two ('00' + now.getUTCMinutes())
      + two ('00' + now.getUTCSeconds());
    return ts;
  }

  var saveInProgress = false;
  function initiateEdit (doEdit, failure) {
    if (saveInProgress) return;
    saveInProgress = true;
    var oldButtonState;
    if (commitButton) {
      oldButtonState = commitButton.disabled;
      commitButton.disabled = true;
    }

    function fail() {
      saveInProgress = false;
      if (commitButton) commitButton.disabled = oldButtonState;
      failure.apply(this, arguments);
    };

    // Must use Ajax here to get the user options and the edit token.
    
    getJSON ({
       uri : wgServer + wgScriptPath + '/api.php'
      ,data : 'format=json&action=query&titles=' + encodeURIComponent (wgPageName)
         + '&prop=info%7Crevisions%7Clanglinks&inprop=watched&intoken=edit&rvprop=content%7Ctimestamp%7Cids%7Cuser&lllimit=500'
         + '&rvlimit=2&rvdir=newer&rvstartid=' + wgCurRevisionId
         + '&meta=siteinfo%7Cuserinfo&uiprop=options'
      ,success : function (json) { setPage(json); doEdit(fail); }
      ,error : function (req) { fail(req.status + ' ' + req.statusText); }
    });
  }

  function multiChangeMsg (count) {
    var msg = HotCat.messages.multi_change;
    if (typeof (msg) != 'string' && msg.length) {
      if (window.mediaWiki && window.mediaWiki.language && window.mediaWiki.language.convertPlural) {
        msg = window.mediaWiki.language.convertPlural (count, msg);
      } else {
        msg = msg[msg.length-1];
      }
    }
    return substitute (msg, [null, "" + count]);     
  }

  function performChanges (failure, singleEditor) {
    if (pageText === null) {
      failure (HotCat.messages.multi_error);
      return;
    }
    // Backwards compatibility after message change (added $2 to cat_keychange)
    if (HotCat.messages.cat_keychange.indexOf ('$2') < 0) {
      HotCat.messages.cat_keychange += '"$2"';
    }
    // More backwards-compatibility with earlier HotCat versions:
    if (!HotCat.messages.short_catchange) {
      HotCat.messages.short_catchange = '[[' + HotCat.category_canonical + ':$1]]';
    }
    // Create a form and submit it. We don't use the edit API (api.php?action=edit) because
    // (a) sensibly reporting back errors like edit conflicts is always a hassle, and
    // (b) we want to show a diff for multi-edits anyway, and
    // (c) we want to trigger onsubmit events, allowing user code to intercept the edit.
    // Using the form, we can do (b) and (c), and we get (a) for free. And, of course, using the form
    // automatically reloads the page with the updated categories on a successful submit, which
    // we would have to do explicitly if we used the edit API.
    var action;
    // Normally, we don't have to care about edit conflicts. If some other user edited the page in the meantime, the
    // server will take care of it and merge the edit automatically or present an edit conflict screen. However, the
    // server suppresses edit conflicts with oneself. Hence, if we have a conflict, and the conflicting user is the
    // current user, then we set the "oldid" value and switch to diff, which gives the "you are editing an old version;
    // if you save, any more recent changes will be lost" screen.
    var editingOldVersion = lastRevId !== null && lastRevId != wgCurRevisionId || pageTextRevId !== null && pageTextRevId != wgCurRevisionId;
    var selfEditConflict = editingOldVersion && conflictingUser && conflictingUser == wgUserName;
    if (singleEditor && !singleEditor.noCommit && !HotCat.no_autocommit && editToken && !selfEditConflict) {
      // If we do have an edit conflict, but not with ourself, that's no reason not to attempt to save: the server side may actually be able to
      // merge the changes. We just need to make sure that we do present a diff view if it's a self edit conflict.
      commitForm.wpEditToken.value = editToken;
      action = commitForm.wpDiff;
      if (action) action.name = action.value = 'wpSave';
    } else {
      action = commitForm.wpSave;
      if (action) action.name = action.value = 'wpDiff';
    }
    var result = { text : pageText };
    var changed = [], added = [], deleted = [], changes = 0;
    var toEdit = !!singleEditor ? [singleEditor] : editors;
    var error = null;
    for (var i=0; i < toEdit.length; i++) {
      if (toEdit[i].state == CategoryEditor.CHANGED) {
        result = change_category (
            result.text
          , toEdit[i].originalCategory
          , toEdit[i].currentCategory
          , toEdit[i].currentKey
          , toEdit[i].currentHidden
        );
        if (!result.error) {
          changes++;
          if (!toEdit[i].originalCategory || toEdit[i].originalCategory.length === 0) {
            added.push (toEdit[i].currentCategory);
          } else {
            changed.push ({from : toEdit[i].originalCategory, to : toEdit[i].currentCategory});
          }
        } else if (error === null) {
          error = result.error;
        }
      } else if (   toEdit[i].state == CategoryEditor.DELETED
                 && toEdit[i].originalCategory
                 && toEdit[i].originalCategory.length > 0)
      {
        result = change_category (result.text, toEdit[i].originalCategory, null, null, false);
        if (!result.error) {
          changes++;
          deleted.push (toEdit[i].originalCategory);
        } else if (error === null) {
          error = result.error;
        }
      }
    }
    if (error !== null) { // Do not commit if there were errors
      action = commitForm.wpSave;
      if (action) action.name = action.value = 'wpDiff';
    }
    // Fill in the form and submit it
    commitForm.wpAutoSummary.value = 'd41d8cd98f00b204e9800998ecf8427e'; // MD5 hash of the empty string
    commitForm.wpMinoredit.checked = minorEdits;
    commitForm.wpWatchthis.checked = wgArticleId == 0 && watchCreate || watchEdit || pageWatched;
    if (wgArticleId > 0 || !!singleEditor) {
      if (changes == 1) {
        if (result.summary && result.summary.length > 0)
          commitForm.wpSummary.value = HotCat.messages.prefix + result.summary.join (HotCat.messages.separator) + HotCat.messages.using;
        commitForm.wpMinoredit.checked = HotCat.single_minor || minorEdits;
      } else if (changes > 1) {
        var summary = [];
        var shortSummary = [];
        // Deleted
        for (var i=0; i < deleted.length; i++) {
          summary.push ('−' + substitute (HotCat.messages.short_catchange, [null, deleted[i]]));
        }
        if (deleted.length == 1)
          shortSummary.push ('−' + substitute (HotCat.messages.short_catchange, [null, deleted[0]]));
        else if (deleted.length > 1)
          shortSummary.push ('− ' + multiChangeMsg (deleted.length));
        // Added
        for (var i=0; i < added.length; i++) {
          summary.push ('+' + substitute (HotCat.messages.short_catchange, [null, added[i]]));
        }
        if (added.length == 1)
          shortSummary.push ('+' + substitute (HotCat.messages.short_catchange, [null, added[0]]));
        else if (added.length > 1)
          shortSummary.push ('+ ' + multiChangeMsg (added.length));
        // Changed
        var arrow = is_rtl ? "←" : "→";
        for (var i=0; i < changed.length; i++) {
          if (changed[i].from != changed[i].to) {
            summary.push ('±' + substitute (HotCat.messages.short_catchange, [null, changed[i].from]) + arrow
                         + substitute (HotCat.messages.short_catchange, [null, changed[i].to]));
          } else {
            summary.push ('±' + substitute (HotCat.messages.short_catchange, [null, changed[i].from]));
          }
        }
        if (changed.length == 1) {
          if (changed[0].from != changed[0].to) {
            shortSummary.push ('±' + substitute (HotCat.messages.short_catchange, [null, changed[0].from]) + arrow
                         + substitute (HotCat.messages.short_catchange, [null, changed[0].to]));
          } else {
            shortSummary.push ('±' + substitute (HotCat.messages.short_catchange, [null, changed[0].from]));
          }
        } else if (changed.length > 1) {
          shortSummary.push ('± ' + multiChangeMsg (changed.length));
        }
        if (summary.length > 0) {
          summary = summary.join (HotCat.messages.separator);
          if (summary.length > 200 - HotCat.messages.prefix.length - HotCat.messages.using.length) {
            summary = shortSummary.join (HotCat.messages.separator);
          }
          commitForm.wpSummary.value = HotCat.messages.prefix + summary + HotCat.messages.using;
        }
      }
    }
    commitForm.wpTextbox1.value = result.text;
    commitForm.wpStarttime.value = serverTime || currentTimestamp ();
    commitForm.wpEdittime.value = pageTime || commitForm.wpStarttime.value;
    if (selfEditConflict) commitForm.oldid.value = "" + (pageTextRevId || wgCurRevisionId);
    // Submit the form in a way that triggers onsubmit events: commitForm.submit() doesn't.
    commitForm.hcCommit.click();
  }

  function resolveMulti (toResolve, callback) {
    for (var i = 0; i < toResolve.length; i++) {
      toResolve[i].dab = null;
      toResolve[i].dabInput = toResolve[i].lastInput;
    }
    if (noSuggestions) {
      callback (toResolve);
      return;
    }
    // Use %7C instead of |, otherwise Konqueror insists on re-encoding the arguments, resulting in doubly encoded
    // category names. (That is a bug in Konqueror. Other browsers don't have this problem.)
    var args = 'action=query&prop=info%7Clinks%7Ccategories%7Ccategoryinfo&plnamespace=14'
             + '&pllimit=' + (toResolve.length * 10)
             + '&cllimit=' + (toResolve.length * 10)
             + '&format=json&titles=';
    for (var i = 0; i < toResolve.length; i++) {
      args += encodeURIComponent ('Category:' + toResolve[i].dabInput);
      if (i+1 < toResolve.length) args += '%7C';
    }
    getJSON({
      uri : wgServer + wgScriptPath + '/api.php'
     ,data : args
     ,success: function (json) { resolveRedirects (toResolve, json); callback (toResolve); }
     ,error: function (req) { if (!req) noSuggestions = true; callback (toResolve); }
    });
  }

  function resolveOne (page, toResolve) {
    var cats     = page.categories;
    var lks      = page.links;
    var is_dab   = false;
    var is_redir = typeof (page.redirect) == 'string'; // Hard redirect?
    var is_hidden = page.categoryinfo && typeof (page.categoryinfo.hidden) == 'string';
    for (var j = 0; j < toResolve.length; j++) {
      if (toResolve[j].dabInput != page.title.substring (page.title.indexOf (':') + 1)) continue;
      toResolve[j].currentHidden = is_hidden;
    }
    if (!is_redir && cats && (HotCat.disambig_category || HotCat.redir_category)) {
      for (var c = 0; c < cats.length; c++) {
        var cat = cats[c]['title'];
        // Strip namespace prefix
        if (cat) {
          cat = cat.substring (cat.indexOf (':') + 1).replace(/_/g, ' ');
          if (cat == HotCat.disambig_category) {
            is_dab = true; break;
          } else if (cat == HotCat.redir_category) {
            is_redir = true; break;
          }
        }
      }
    }
    if (!is_redir && !is_dab) return;
    if (!lks || lks.length === 0) return;
    var titles = [];
    for (var i = 0; i < lks.length; i++) {
      if (   lks[i]['ns'] == 14                             // Category namespace
          && lks[i]['title'] && lks[i]['title'].length > 0) // Name not empty
      {
        // Internal link to existing thingy. Extract the page name and remove the namespace.
        var match = lks[i]['title'];
        titles.push (match.substring (match.indexOf (':') + 1));
        if (is_redir) break;
      }
    }
    for (var j = 0; j < toResolve.length; j++) {
      if (toResolve[j].dabInput != page.title.substring (page.title.indexOf (':') + 1)) continue;
      if (titles.length > 1) {
        toResolve[j].dab = titles;
      } else {
        toResolve[j].inputExists = true; // Might actually be wrong...
        toResolve[j].icon.src = armorUri(HotCat.existsYes);
        toResolve[j].text.value =
          titles[0] + (toResolve[j].currentKey != null ? '|' + toResolve[j].currentKey : "");
      }
    }
  }

  function resolveRedirects (toResolve, params) {
    if (!params || !params.query || !params.query.pages) return;
    for (var p in params.query.pages) resolveOne (params.query.pages[p], toResolve);
  }

  function multiSubmit () {
    var toResolve = [];
    for (var i = 0; i < editors.length; i++) {
      if (editors[i].state == CategoryEditor.CHANGE_PENDING || editors[i].state == CategoryEditor.OPEN)
        toResolve.push (editors[i]);
    }
    if (toResolve.length === 0) {
      initiateEdit (function (failure) {performChanges (failure);}, function (msg) {alert (msg);});
      return;
    }
    resolveMulti (
        toResolve
      , function (resolved) {
          var firstDab = null;
          var dontChange = false;
          for (var i = 0; i < resolved.length; i++) {
            if (resolved[i].lastInput != resolved[i].dabInput) {
              // We didn't disable all the open editors, but we did asynchronous calls. It is
              // theoretically possible that the user changed something...
              dontChange = true;
            } else {
              if (resolved[i].dab) {
                if (!firstDab) firstDab = resolved[i];
              } else {
                if (resolved[i].acceptCheck(true)) resolved[i].commit();
              }
            }
          }
          if (firstDab) {
            showDab (firstDab);
          } else if (!dontChange) {
            initiateEdit (function (failure) {performChanges (failure);}, function (msg) {alert (msg);});
          }
        }
    );
  }

  var cat_prefix = null;
  var noSuggestions = false;
  var suggestionEngines = {
    opensearch :
      { uri     : '/api.php?format=json&action=opensearch&namespace=14&limit=30&search=Category:$1' // $1 = search term
       ,handler : // Function to convert result of uri into an array of category names
          function (queryResult, queryKey) {
            if (   queryResult != null && queryResult.length == 2
                && queryResult[0].toLowerCase() == 'category:' + queryKey.toLowerCase()
               )
            {
              var titles = queryResult[1];
              if (!cat_prefix) cat_prefix = new RegExp ('^(' + HotCat.category_regexp + ':)');
              for (var i = 0; i < titles.length; i++) {
                cat_prefix.lastIndex = 0;
                var m = cat_prefix.exec (titles[i]);
                if (m && m.length > 1) {
                  titles[i] = titles[i].substring (titles[i].indexOf (':') + 1); // rm namespace
                } else {
                  titles.splice (i, 1); // Nope, it's not a category after all.
                  i--;
                }
              }
              return titles;
            }
            return null;
          }
      }
    ,internalsearch :
      { uri     : '/api.php?format=json&action=query&list=allpages&apnamespace=14&aplimit=30&apfrom=$1'
       ,handler :
          function (queryResult, queryKey) {
            if (queryResult && queryResult.query && queryResult.query.allpages) {
              var titles = queryResult.query.allpages;
              var key    = queryKey.toLowerCase();
              for (var i = 0; i < titles.length; i++) {
                titles[i] = titles[i].title.substring (titles[i].title.indexOf (':') + 1); // rm namespace
                if (titles[i].toLowerCase().indexOf (key) != 0) {
                  titles.splice (i, 1); // Doesn't start with the query key
                  i--;
                }
              }
              return titles;
            }
            return null;
          }
      }
    ,subcategories :
      // I don't understand why they didn't map cmnamespace=14 automatically to cmtype=subcat,
      // which gives better results and is faster.
      { uri     : '/api.php?format=json&action=query&list=categorymembers'
                 +(function (version) {
                     var m = version.match(/^(\d+)\.(\d+)/);
                     var major = 0, minor = 0;
                     if (m && m.length > 1) {
                       major = parseInt (m[1], 10);
                       minor = (m.length > 2 ? parseInt (m[2], 10) : 0);
                     }
                     if (major > 1 || major === 1 && minor > 17) return '&cmtype=subcat'; // Since MW1.18
                     return '&cmnamespace=14';
                   }
                  )(wgVersion)
                 +'&cmlimit=max&cmtitle=Category:$1'
       ,handler :
          function (queryResult, queryKey) {
            if (queryResult && queryResult.query && queryResult.query.categorymembers) {
              var titles = queryResult.query.categorymembers;
              for (var i = 0; i < titles.length; i++) {
                titles[i] = titles[i].title.substring (titles[i].title.indexOf (':') + 1); // rm namespace
              }
              return titles;
            }
            return null;
          }
      }
   ,parentcategories :
      { uri     : '/api.php?format=json&action=query&prop=categories&titles=Category:$1&cllimit=max'
       ,handler :
          function (queryResult, queryKey) {
            if (queryResult && queryResult.query && queryResult.query.pages) {
              for (var p in queryResult.query.pages) {
                if (queryResult.query.pages[p].categories) {
                  var titles = queryResult.query.pages[p].categories;
                  for (var i = 0; i < titles.length; i++) {
                    titles[i] = titles[i].title.substring (titles[i].title.indexOf (':') + 1); // rm namespace
                  }
                  return titles;
                }
              }
            }
            return null;
          }
      }
  };

  var suggestionConfigs = {
    searchindex : {name: 'Search index', engines: ['opensearch'], cache: {}, show: true, temp: false, noCompletion : false}
   ,pagelist    : {name: 'Page list', engines: ['internalsearch'], cache: {}, show: true, temp: false, noCompletion : false}
   ,combined    : {name: 'Combined search', engines: ['opensearch', 'internalsearch'], cache: {}, show: true, temp: false, noCompletion : false}
   ,subcat      : {name: 'Subcategories', engines: ['subcategories'], cache: {}, show: true, temp: true, noCompletion : true}
   ,parentcat   : {name: 'Parent categories', engines: ['parentcategories'], cache: {}, show: true, temp: true, noCompletion : true}
  };

  function CategoryEditor () { this.initialize.apply (this, arguments); };
  CategoryEditor.UNCHANGED      = 0;
  CategoryEditor.OPEN           = 1; // Open, but no input yet
  CategoryEditor.CHANGE_PENDING = 2; // Open, some input made
  CategoryEditor.CHANGED        = 3;
  CategoryEditor.DELETED        = 4;

  // IE6 sometimes forgets to redraw the list when editors are opened or closed.
  // Adding/removing a dummy element helps, at least when opening editors.
  var dummyElement = make ('\xa0', true);

  function forceRedraw () {
    if (!is_ie6) return;
    if (dummyElement.parentNode) {
      document.body.removeChild (dummyElement);
    } else {
      document.body.appendChild (dummyElement);
    }
  }

  function makeActive (which) {
    if (which.is_active) return;
    for (var i = 0; i < editors.length; i++) {
      if (editors[i] !== which) editors[i].inactivate ();
    }
    which.is_active = true;
    if (which.dab) {
      showDab (which);
    } else {
      // Check for programmatic value changes.
      var expectedInput = which.lastRealInput || which.lastInput || "";
      var actualValue = which.text.value || "";
      if (expectedInput.length == 0 && actualValue.length > 0 || expectedInput.length > 0 && actualValue.indexOf (expectedInput) !== 0) {
        // Somehow the field's value appears to have changed, and which.lastSelection therefore is no longer valid. Try to set the
        // cursor at the end of the category, and do not display the old suggestion list.
        which.showsList = false;
        var v = actualValue.split('|');
        which.lastRealInput = which.lastInput = v[0];
        if (v.length > 1) which.currentKey = v[1];
        if (which.lastSelection) which.lastSelection = {start: v[0].length, end: v[0].length}; 
      }
      if (which.showsList) which.displayList();
      if (which.lastSelection) {
        if (is_webkit) {
          // WebKit (Safari, Chrome) has problems selecting inside focus()
          // See http://code.google.com/p/chromium/issues/detail?id=32865#c6
          window.setTimeout (
             function () { which.setSelection (which.lastSelection.start, which.lastSelection.end); }
            ,1
          );
        } else {
          which.setSelection (which.lastSelection.start, which.lastSelection.end);
        }
      }
    }
  }

  function showDab (which) {
    if (!which.is_active) {
      makeActive(which);
    } else {
      which.showSuggestions (which.dab, false, null, null); // do autocompletion, no key, no engine selector
      which.dab = null;
    }
  }

  CategoryEditor.prototype = {

    initialize : function (line, span, after, key, is_hidden) {
      // If a span is given, 'after' is the category title, otherwise it may be an element after which to
      // insert the new span. 'key' is likewise overloaded; if a span is given, it is the category key (if
      // known), otherwise it is a boolean indicating whether a bar shall be prepended.
      if (!span) {
        this.isAddCategory = true;
        // Create add span and append to catLinks
        this.originalCategory = "";
        this.originalKey = null;
        this.originalExists   = false;
        if (!newDOM) {
          span = make ('span');
          span.className = 'noprint';
          if (key) {
            span.appendChild (make (' | ', true));
            if (after) {
              after.parentNode.insertBefore (span, after.nextSibling);
              after = after.nextSibling;
            } else {
              line.appendChild (span);
            }
          } else if (line.firstChild) {
            span.appendChild (make (' ', true));
            line.appendChild (span);
          }
        }
        this.linkSpan = make ('span');
        this.linkSpan.className = 'noprint nopopups hotcatlink';
        var lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.open, this);
        lk.appendChild (make (HotCat.links.add, true)); lk.title = HotCat.tooltips.add;
        this.linkSpan.appendChild (lk);
        span = make (newDOM ? 'li' : 'span');
        span.className = 'noprint';
        if (is_rtl) span.dir = 'rtl';
        span.appendChild (this.linkSpan);
        if (after)
          after.parentNode.insertBefore (span, after.nextSibling);
        else
          line.appendChild (span);
        this.normalLinks = null;
        this.undelLink = null;
        this.catLink = null;
      } else {
        if (is_rtl) span.dir = 'rtl';
        this.isAddCategory = false;
        this.catLink = span.firstChild;
        this.originalCategory = after;
        this.originalKey = (key && key.length > 1) ? key.substr(1) : null; // > 1 because it includes the leading bar
        this.originalExists   = !hasClass (this.catLink, 'new');
        // Create change and del links
        this.makeLinkSpan ();
        if (!this.originalExists && this.upDownLinks) this.upDownLinks.style.display = 'none';
        span.appendChild (this.linkSpan);
      }
      this.originalHidden     = is_hidden;
      this.line               = line;
      this.engine             = HotCat.suggestions;
      this.span               = span;
      this.currentCategory    = this.originalCategory;
      this.currentExists      = this.originalExists;
      this.currentHidden      = this.originalHidden;
      this.currentKey         = this.originalKey;
      this.state              = CategoryEditor.UNCHANGED;
      this.lastSavedState     = CategoryEditor.UNCHANGED;
      this.lastSavedCategory  = this.originalCategory;
      this.lastSavedKey       = this.originalKey;
      this.lastSavedExists    = this.originalExists;
      this.lastSavedHidden    = this.originalHidden;
      if (this.catLink && this.currentKey) {
        this.catLink.title = this.currentKey;
      }
      editors[editors.length] = this;
    },

    makeLinkSpan : function () {
      this.normalLinks = make ('span');
      var lk = null;
      if (this.originalCategory && this.originalCategory.length > 0) {
        lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.remove, this);
        lk.appendChild (make (HotCat.links.remove, true)); lk.title = HotCat.tooltips.remove;
        this.normalLinks.appendChild (make (' ', true));
        this.normalLinks.appendChild (lk);
      }
      if (!HotCat.template_categories[this.originalCategory]) {
        lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.open, this);
        lk.appendChild (make (HotCat.links.change, true)); lk.title = HotCat.tooltips.change;
        this.normalLinks.appendChild (make (' ', true));
        this.normalLinks.appendChild (lk);
        if (!noSuggestions && HotCat.use_up_down) {
          this.upDownLinks = make ('span');
          lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.down, this);
          lk.appendChild (make (HotCat.links.down, true)); lk.title = HotCat.tooltips.down;
          this.upDownLinks.appendChild (make (' ', true));
          this.upDownLinks.appendChild (lk);
          lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.up, this);
          lk.appendChild (make (HotCat.links.up, true)); lk.title = HotCat.tooltips.up;
          this.upDownLinks.appendChild (make (' ', true));
          this.upDownLinks.appendChild (lk);
          this.normalLinks.appendChild (this.upDownLinks);
        }
      }
      this.linkSpan = make ('span');
      this.linkSpan.className = 'noprint nopopups hotcatlink';
      this.linkSpan.appendChild (this.normalLinks);
      this.undelLink = make ('span');
      this.undelLink.className = 'nopopups hotcatlink';
      this.undelLink.style.display = 'none';
      lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.restore, this);
      lk.appendChild (make (HotCat.links.restore, true)); lk.title = HotCat.tooltips.restore;
      this.undelLink.appendChild (make (' ', true));
      this.undelLink.appendChild (lk);
      this.linkSpan.appendChild (this.undelLink);
    },

    makeForm : function () {
      var form = make ('form');
      form.method = 'POST'; form.onsubmit = bind (this.accept, this);
      this.form = form;
      var self = this;
      var text = make ('input'); text.type = 'text'; text.size = HotCat.editbox_width;
      if (!noSuggestions) {
        text.onkeyup =
          function (evt) {
            evt = evt || window.event || window.Event; // W3C, IE, Netscape
            var key = evt.keyCode || 0;
            if (key === 38 || key === 40 || key === 33 || key === 34) { // Up and down arrows, page up/down
              // In case a browser doesn't generate keypress events for arrow keys...
              if (self.keyCount === 0) return self.processKey (evt);
            } else {
              if (key == 27) { // ESC
                if (!self.resetKeySelection ()) {
                  // No undo of key selection: treat ESC as "cancel".
                  self.cancel ();
                  return;
                }
              }
              // Also do this for ESC as a workaround for Firefox bug 524360
              // https://bugzilla.mozilla.org/show_bug.cgi?id=524360
              var dont_autocomplete = (key == 8 || key == 46 || key == 27); // BS, DEL, ESC
              if (self.engine && suggestionConfigs[self.engine] && suggestionConfigs[self.engine].temp && !dont_autocomplete) {
                self.engine = HotCat.suggestions; // Reset to a search upon input
              }
              self.state = CategoryEditor.CHANGE_PENDING;
              window.setTimeout (function () {self.textchange (dont_autocomplete);}, HotCat.suggest_delay);
            }
            return true;
          };
        text.onkeydown =
          function (evt) {
            evt = evt || window.event || window.Event; // W3C, IE, Netscape
            self.lastKey = evt.keyCode || 0;
            self.keyCount = 0;
            // Handle return explicitly, to override the default form submission to be able to check for ctrl
            if (self.lastKey == 13) return self.accept (evt);
            // Inhibit default behavior of ESC (revert to last real input in FF: we do that ourselves)
            return (self.lastKey == 27) ? evtKill(evt) : true;
          };
        // And handle continued pressing of arrow keys
        text.onkeypress = function (evt) {self.keyCount++; return self.processKey (evt);};
      }
      this.text = text;

      this.icon = make ('img');

      var list = null;
      if (!noSuggestions) {
        list = make ('select');
        list.onclick    = function (e) { if (self.highlightSuggestion(0)) self.textchange (false, true); };
        list.ondblclick = function (e) { if (self.highlightSuggestion(0)) self.accept (e); };
        list.onchange = function (e) { self.highlightSuggestion(0); self.text.focus(); };
        list.onkeyup =
          function (evt) {
            evt = evt || window.event || window.Event; // W3C, IE, Netscape
            if (evt.keyCode == 27) {
              self.resetKeySelection ();
              self.text.focus();
              window.setTimeout (function () {self.textchange (true);}, HotCat.suggest_delay);
            } else if (evt.keyCode == 13) {
              self.accept (evt);
            }
          };
        if (!HotCat.fixed_search) {
          var engineSelector = make ('select');
          for (var key in suggestionConfigs) {
            if (suggestionConfigs[key].show) {
              var opt = make ('option');
              opt.value = key;
              if (key == this.engine) opt.selected = true;
              opt.appendChild (make (suggestionConfigs[key].name, true));
              engineSelector.appendChild (opt);
            }
          }
          engineSelector.onchange =
            function () {
              self.engine = self.engineSelector.options[self.engineSelector.selectedIndex].value;
              self.text.focus();
              self.textchange (true, true); // Don't autocomplete, force re-display of list
            };
          this.engineSelector = engineSelector;
        }
      }
      this.list = list;

      function button_label (id, defaultText) {
        var label = null;
        if (   onUpload
            && typeof (UFUI) != 'undefined'
            && typeof (UIElements) != 'undefined'
            && typeof (UFUI.getLabel) == 'function') {
          try {
            label = UFUI.getLabel (id, true);
            // Extract the plain text. IE doesn't know that Node.TEXT_NODE == 3
            while (label && label.nodeType != 3) label = label.firstChild;
          } catch (ex) {
            label = null;
          }
        }
        if (!label || !label.data) return defaultText;
        return label.data;
      }

      // Do not use type 'submit'; we cannot detect modifier keys if we do
      var OK = make ('input'); OK.type = 'button';
      OK.value = button_label ('wpOkUploadLbl', HotCat.messages.ok);
      OK.onclick = bind (this.accept, this);
      this.ok = OK;

      var cancel = make ('input'); cancel.type = 'button';
      cancel.value = button_label ('wpCancelUploadLbl', HotCat.messages.cancel);
      cancel.onclick = bind (this.cancel, this);
      this.cancelButton = cancel;

      var span = make ('span');
      span.className = 'hotcatinput';
      span.style.position = 'relative';
      // FF3.6: add the input field first, then the two absolutely positioned elements. Otherwise, FF3.6 may leave the
      // suggestions and the selector at the right edge of the screen if display of the input field causes a re-layout
      // moving the form to the front of the next line.
      span.appendChild (text);

      // IE8/IE9: put some text into this span (a0 is nbsp) and make sure it always stays on the
      // same line as the input field, otherwise, IE8/9 miscalculates the height of the span and
      // then the engine selector may overlap the input field.
      span.appendChild (make ('\xa0', true));
      span.style.whiteSpace = 'nowrap';

      if (list) span.appendChild (list);
      if (this.engineSelector) span.appendChild (this.engineSelector);
      if (!noSuggestions) span.appendChild (this.icon);
      span.appendChild (OK);
      span.appendChild (cancel);
      form.appendChild(span);
      form.style.display = 'none';
      this.span.appendChild (form);
      addEvent (text, 'focus', function () { makeActive(self); });
      // On IE, blur events are asynchronous, and may thus arrive after the element has lost the focus. Since IE
      // can get the selection only while the element is active (has the focus), we may not always get the selection.
      // Therefore, use an IE-specific synchronous event on IE...
      // Don't test for text.selectionStart being defined; FF3.6.4 raises an exception when trying to access that
      // property while the element is not being displayed.
      addEvent (text, (typeof text.onbeforedeactivate != 'undefined' && text.createTextRange) ? 'beforedeactivate' : 'blur', bind (this.saveView, this)); 
    },

    display : function (evt) {
      if (this.isAddCategory && !onUpload) {
        var newAdder = new CategoryEditor (this.line, null, this.span, true); // Create a new one
      }
      if (!commitButton && !onUpload) {
        for (var i = 0; i < editors.length; i++) {
          if (editors[i].state != CategoryEditor.UNCHANGED) {
            setMultiInput();
            break;
          }
        }
      }
      if (!this.form) {
        this.makeForm ();
      }
      if (this.list) this.list.style.display = 'none';
      if (this.engineSelector) this.engineSelector.style.display = 'none';
      this.currentCategory = this.lastSavedCategory;
      this.currentExists   = this.lastSavedExists;
      this.currentHidden   = this.lastSavedHidden;
      this.currentKey      = this.lastSavedKey;
      this.icon.src = armorUri(this.currentExists ? HotCat.existsYes : HotCat.existsNo);
      this.text.value = this.currentCategory + (this.currentKey != null ? '|' + this.currentKey : "");
      this.originalState = this.state;
      this.lastInput     = this.currentCategory;
      this.inputExists   = this.currentExists;
      this.state         = this.state == CategoryEditor.UNCHANGED ? CategoryEditor.OPEN : CategoryEditor.CHANGE_PENDING;
      this.lastSelection = {start: this.currentCategory.length, end: this.currentCategory.length};
      this.showsList = false;
      // Display the form
      if (this.catLink) this.catLink.style.display = 'none';
      this.linkSpan.style.display = 'none';
      this.form.style.display = 'inline';
      this.ok.disabled = false;
      // Kill the event before focussing, otherwise IE will kill the onfocus event!
      var result = evtKill (evt);
      this.text.focus();
      this.text.readOnly = false;
      checkMultiInput ();
      return result;
    },

    show : function (evt, engine, readOnly) {
      var result = this.display (evt);
      var v = this.lastSavedCategory;
      if (v.length === 0) return result;
      this.text.readOnly = !!readOnly;
      this.engine = engine;
      this.textchange (false, true); // do autocompletion, force display of suggestions
      forceRedraw ();
      return result;
    },
 
    open : function (evt) {
      return this.show (evt, (this.engine && suggestionConfigs[this.engine].temp) ? HotCat.suggestions : this.engine);
    },

    down : function (evt) {
      return this.show (evt, 'subcat', true);
    },

    up : function (evt) {
      return this.show (evt, 'parentcat');
    },

    cancel : function () {
      if (this.isAddCategory && !onUpload) {
        this.removeEditor(); // We added a new adder when opening
        return;
      }
      // Close, re-display link
      this.inactivate();
      this.form.style.display = 'none';
      if (this.catLink) this.catLink.style.display = "";
      this.linkSpan.style.display = "";
      this.state = this.originalState;
      this.currentCategory = this.lastSavedCategory;
      this.currentKey      = this.lastSavedKey;
      this.currentExists   = this.lastSavedExists;
      this.currentHidden   = this.lastSavedHidden;
      if (this.catLink) {
        if (this.currentkey && this.currentKey.length > 0) {
          this.catLink.title = this.currentKey;
        } else {
          this.catLink.title = null;
        }
      }
      if (this.state == CategoryEditor.UNCHANGED) {
        if (this.catLink) this.catLink.style.backgroundColor = 'transparent';
      } else {
        if (!onUpload) {
          try {
            this.catLink.style.backgroundColor = HotCat.bg_changed;
          } catch (ex) {}
        }
      }
      checkMultiInput ();
      forceRedraw ();
    },

    removeEditor : function () {
      if (!newDOM) {
        var next = this.span.nextSibling;
        if (next) next.parentNode.removeChild (next);
      }
      this.span.parentNode.removeChild (this.span);
      for (var i = 0; i < editors.length; i++) {
        if (editors[i] == this) {
          editors.splice (i, 1);
          break;
        }
      }
      checkMultiInput ();
      var self = this;
      window.setTimeout (function () {delete self;}, 10);
    },

    rollback : function (evt) {
      this.undoLink.parentNode.removeChild (this.undoLink);
      this.undoLink = null;
      this.currentCategory = this.originalCategory;
      this.currentKey = this.originalKey;
      this.currentExists = this.originalExists;
      this.currentHidden = this.originalHidden;
      this.lastSavedCategory = this.originalCategory;
      this.lastSavedKey = this.originalKey;
      this.lastSavedExists = this.originalExists;
      this.lastSavedHidden = this.originalHidden;
      this.state = CategoryEditor.UNCHANGED;
      if (!this.currentCategory || this.currentCategory.length === 0) {
        // It was a newly added category. Remove the whole editor.
        this.removeEditor();
      } else {
        // Redisplay the link...
        this.catLink.removeChild (this.catLink.firstChild);
        this.catLink.appendChild (make (this.currentCategory, true));
        this.catLink.href = wikiPagePath (HotCat.category_canonical + ':' + this.currentCategory);
        this.catLink.title = this.currentKey;
        this.catLink.className = this.currentExists ? "" : 'new';
        this.catLink.style.backgroundColor = 'transparent';
        if (this.upDownLinks) this.upDownLinks.style.display = this.currentExists ? "" : 'none';
        checkMultiInput ();
      }
      return evtKill (evt);
    },

    inactivate : function () {
      if (this.list) this.list.style.display = 'none';
      if (this.engineSelector) this.engineSelector.style.display = 'none';
      this.is_active = false;
    },

    acceptCheck : function (dontCheck) {
      this.sanitizeInput ();
      var value = this.text.value.split('|');
      var key   = null;
      if (value.length > 1) key = value[1];
      var v = value[0].replace(/_/g, ' ').replace(/^\s+|\s+$/g, "");
      if (HotCat.capitalizePageNames) v = capitalize (v);
      this.lastInput = v;
      if (v.length === 0) {
        this.cancel ();
        return false;
      }
      if (!dontCheck
          && (   wgNamespaceNumber == 14 && v == wgTitle
              || HotCat.blacklist != null && HotCat.blacklist.test(v))
         ) {
        this.cancel ();
        return false;
      }
      this.currentCategory = v;
      this.currentKey = key;
      this.currentExists = this.inputExists;
      return true;
    },

    accept : function (evt) {
      this.noCommit = (evtKeys (evt) & 1) != 0;
      var result = evtKill (evt);
      if (this.acceptCheck ()) {
        var toResolve = [this];
        var original  = this.currentCategory;
        resolveMulti (
            toResolve
          , function (resolved) {
              if (resolved[0].dab) {
                showDab (resolved[0]);
              } else {
                if (resolved[0].acceptCheck(true)) {
                  resolved[0].commit (
                    (resolved[0].currentCategory != original)
                      ? HotCat.messages.cat_resolved.replace (/\$1/g, original)
                      : null
                  );
                }
              }
            }
        );
      }
      return result;
    },

    close : function () {
      if (!this.catLink) {
        // Create a catLink
        this.catLink = make ('a');
        this.catLink.appendChild (make ('foo', true));
        this.catLink.style.display = 'none';
        this.span.insertBefore (this.catLink, this.span.firstChild.nextSibling);
      }
      this.catLink.removeChild (this.catLink.firstChild);
      this.catLink.appendChild (make (this.currentCategory, true));
      this.catLink.href = wikiPagePath (HotCat.category_canonical + ':' + this.currentCategory);
      this.catLink.title = "";
      this.catLink.className = this.currentExists ? "" : 'new';
      this.lastSavedCategory = this.currentCategory;
      this.lastSavedKey      = this.currentKey;
      this.lastSavedExists   = this.currentExists;
      this.lastSavedHidden   = this.currentHidden;
      // Close form and redisplay category
      this.inactivate();
      this.form.style.display = 'none';
      this.catLink.title = this.currentKey;
      this.catLink.style.display = "";
      if (this.isAddCategory) {
        if (onUpload) {
          var newAdder = new CategoryEditor (this.line, null, this.span, true); // Create a new one
        }
        this.isAddCategory = false;
        this.linkSpan.parentNode.removeChild (this.linkSpan);
        this.makeLinkSpan ();
        this.span.appendChild (this.linkSpan);
      }
      if (!this.undoLink) {
        // Append an undo link.
        var span = make ('span');
        var lk = make ('a'); lk.href = '#catlinks'; lk.onclick = bind (this.rollback, this);
        lk.appendChild (make (HotCat.links.undo, true)); lk.title = HotCat.tooltips.undo;
        span.appendChild (make (' ', true));
        span.appendChild (lk);
        this.normalLinks.appendChild (span);
        this.undoLink = span;
        if (!onUpload) {
          try {
            this.catLink.style.backgroundColor = HotCat.bg_changed;
          } catch (ex) {}
        }
      }
      if (this.upDownLinks) this.upDownLinks.style.display = this.lastSavedExists ? "" : 'none';
      this.linkSpan.style.display = "";
      this.state = CategoryEditor.CHANGED;
      checkMultiInput ();
      forceRedraw ();
    },

    commit : function (comment) {
      // Check again to catch problem cases after redirect resolution
      if (   (   this.currentCategory == this.originalCategory
              && (this.currentKey == this.originalKey
                  || this.currentKey === null && this.originalKey.length === 0
                 )
             )
          || wgNamespaceNumber == 14 && this.currentCategory == wgTitle
          || HotCat.blacklist != null && HotCat.blacklist.test (this.currentCategory)
         )
      {
        this.cancel ();
        return;
      }
      if (commitButton || onUpload) {
        this.close ();
      } else {
        this.close ();
        var self = this;
        initiateEdit (function (failure) {performChanges (failure, self);}, function (msg) {alert (msg);});
      }
    },

    remove : function (evt) {
      this.doRemove (evtKeys (evt) & 1);
      return evtKill (evt);
    },

    doRemove : function (noCommit) {
      if (this.isAddCategory) { // Empty input on adding a new category
        this.cancel ();
        return;
      }
      if (!commitButton && !onUpload) {
        for (var i = 0; i < editors.length; i++) {
          if (editors[i].state != CategoryEditor.UNCHANGED) {
            setMultiInput();
            break;
          }
        }
      }
      if (commitButton) {
        this.catLink.title = "";
        this.catLink.style.cssText += '; text-decoration : line-through !important;';
        try {
          this.catLink.style.backgroundColor = HotCat.bg_changed;
        } catch (ex) {}
        this.originalState = this.state;
        this.state = CategoryEditor.DELETED;
        this.normalLinks.style.display = 'none';
        this.undelLink.style.display = "";
        checkMultiInput ();
      } else {
        if (onUpload) {
          // Remove this editor completely
          this.removeEditor ();
        } else {
          this.originalState = this.state;
          this.state = CategoryEditor.DELETED;
          this.noCommit = noCommit;
          var self = this;
          initiateEdit (function (failure) {performChanges (failure, self);}, function (msg) {self.state = self.originalState; alert (msg);});
        }
      }
    },

    restore : function (evt) {
      // Can occur only if we do have a commit button and are not on the upload form
      this.catLink.title = this.currentKey;
      this.catLink.style.textDecoration = "";
      this.state = this.originalState;
      if (this.state == CategoryEditor.UNCHANGED) {
        this.catLink.style.backgroundColor = 'transparent';
      } else {
        try {
          this.catLink.style.backgroundColor = HotCat.bg_changed;
        } catch (ex) {}
      }
      this.normalLinks.style.display = "";
      this.undelLink.style.display = 'none';
      checkMultiInput ();
      return evtKill (evt);
    },

    // Internal operations

    selectEngine : function (engineName) {
      if (!this.engineSelector) return;
      for (var i = 0; i < this.engineSelector.options.length; i++) {
        this.engineSelector.options[i].selected = this.engineSelector.options[i].value == engineName;
      }
    },

    sanitizeInput : function () {
      var v = this.text.value || "";
      v = v.replace(/^(\s|_)+/, ""); // Trim leading blanks and underscores
      var re = new RegExp ('^(' + HotCat.category_regexp + '):');
      if (re.test (v)) v = v.substring (v.indexOf (':') + 1);
      if (HotCat.capitalizePageNames) v = capitalize (v);
      // Only update the input field if there is a difference. IE8 appears to reset the selection
      // and place the cursor at the front upon reset, which makes our autocompletetion become a
      // nuisance. FF and IE6 don't seem to have this problem.
      if (this.text.value != null && this.text.value != v)
        this.text.value = v;
    },

    makeCall : function (url, callbackObj, engine, queryKey, cleanKey) {
      var cb = callbackObj;
      var e  = engine;
      var v  = queryKey;
      var z  = cleanKey;
      var thisObj = this;

      function done () {
        cb.callsMade++;
        if (cb.callsMade === cb.nofCalls) {
          if (!cb.dontCache && !suggestionConfigs[cb.engineName].cache[z]) {
            suggestionConfigs[cb.engineName].cache[z] = cb.allTitles;
          }
          thisObj.text.readOnly = false;
          if (!cb.cancelled) thisObj.showSuggestions (cb.allTitles, cb.noCompletion, v, cb.engineName);
          if (cb === thisObj.callbackObj) thisObj.callbackObj = null;
          delete cb;
        }
      }

      getJSON ({
        uri : url
       ,success : function (json) {
          var titles = e.handler (json, z);
          if (titles && titles.length > 0) {
            if (cb.allTitles === null) {
              cb.allTitles = titles;
            } else {
              cb.allTitles = cb.allTitles.concat (titles);
            }
          }
          done();
        }
       ,error : function (req) {if (!req) noSuggestions = true; cb.dontCache = true; done(); }
      });           
    },

    callbackObj : null,

    textchange : function (dont_autocomplete, force) {
      // Hide all other lists
      makeActive (this);
      // Get input value, omit sort key, if any
      this.sanitizeInput ();
      var v = this.text.value;
      // Disregard anything after a pipe.
      var pipe = v.indexOf ('|');
      if (pipe >= 0) {
        this.currentKey = v.substring (pipe+1);
        v = v.substring (0, pipe);
      } else {
        this.currentKey = null;
      }
      if (this.lastInput == v && !force) return; // No change
      if (this.lastInput != v) checkMultiInput ();
      this.lastInput = v;
      this.lastRealInput = v;

      // Mark blacklisted inputs.
      this.ok.disabled = v.length > 0 && HotCat.blacklist != null && HotCat.blacklist.test (v);

      if (noSuggestions) {
        // No Ajax: just make sure the list is hidden
        if (this.list) this.list.style.display = 'none';
        if (this.engineSelector) this.engineSelector.style.display = 'none';
        if (this.icon) this.icon.style.display = 'none';
        return;
      }

      if (v.length === 0) { this.showSuggestions([]); return; }
      if (this.callbackObj) this.callbackObj.cancelled = true;
      var engineName  = suggestionConfigs[this.engine] ? this.engine : 'combined';

      var cleanKey = v.replace(/[\u200E\u200F\u202A-\u202E]/g, "")
                      .replace(wikiTextBlankRE, ' ');
      dont_autocomplete = dont_autocomplete || suggestionConfigs[engineName].noCompletion;
      if (suggestionConfigs[engineName].cache[cleanKey]) {
        this.showSuggestions (suggestionConfigs[engineName].cache[cleanKey], dont_autocomplete, v, engineName);
        return;
      }

      var engines = suggestionConfigs[engineName].engines;
      this.callbackObj =
        {allTitles: null, callsMade: 0, nofCalls: engines.length, noCompletion: dont_autocomplete, engineName: engineName};
      this.makeCalls (engines, this.callbackObj, v, cleanKey);
    },

    makeCalls : function (engines, cb, v, cleanKey) {
      for (var j = 0; j < engines.length; j++) {
        var engine = suggestionEngines[engines[j]];
        var url = wgServer + wgScriptPath + engine.uri.replace (/\$1/g, encodeURIComponent (cleanKey));
        this.makeCall (url, cb, engine, v, cleanKey);
      }
    },

    showSuggestions : function (titles, dontAutocomplete, queryKey, engineName) {
      this.text.readOnly = false;
      this.dab = null;
      this.showsList = false;
      if (!this.list) return;
      if (noSuggestions) {
        if (this.list) this.list.style.display = 'none';
        if (this.engineSelector) this.engineSelector.style.display = 'none';
        if (this.icon) this.icon.style.display = 'none';
        this.inputExists = true; // Default...
        return;
      }      
      this.engineName = engineName;
      if (engineName) {
        if (!this.engineSelector) this.engineName = null;
      } else {
        if (this.engineSelector) this.engineSelector.style.display = 'none';
      }
      if (queryKey) {
        if (this.lastInput.indexOf (queryKey) != 0) return;
        if (this.lastQuery && this.lastInput.indexOf (this.lastQuery) === 0 && this.lastQuery.length > queryKey.length)
          return;
      }
      this.lastQuery = queryKey;

      // Get current input text
      var v = this.text.value.split('|');
      var key = v.length > 1 ? '|' + v[1] : "";
      v = (HotCat.capitalizePageNames ? capitalize (v[0]) : v[0]);

      if (titles) {
        var vLow = v.toLowerCase ();
        // Strip blacklisted categories
        if (HotCat.blacklist != null) {
          for (var i = 0; i < titles.length; i++) {
            if (HotCat.blacklist.test (titles[i])) {
              titles.splice(i, 1);
              i--;
            }
          }
        }
        titles.sort (
          function (a, b) {
            if (a.indexOf (b) === 0) return 1; // a begins with b: a > b
            if (b.indexOf (a) === 0) return -1; // b begins with a: a < b
            // Opensearch may return stuff not beginning with the search prefix!
            var prefixMatchA = (a.indexOf (v) === 0 ? 1 : 0);
            var prefixMatchB = (b.indexOf (v) === 0 ? 1 : 0);
            if (prefixMatchA != prefixMatchB) return prefixMatchB - prefixMatchA;
            // Case-insensitive prefix match!
            var aLow = a.toLowerCase(), bLow = b.toLowerCase();
            prefixMatchA = (aLow.indexOf (vLow) === 0 ? 1 : 0);
            prefixMatchB = (bLow.indexOf (vLow) === 0 ? 1 : 0);
            if (prefixMatchA != prefixMatchB) return prefixMatchB - prefixMatchA;
            if (a < b) return -1;
            if (b < a) return 1;
            return 0;
          }
        );
        // Remove duplicates and self-references
        for (var i = 0; i < titles.length; i++) {
          if (   i+1 < titles.length && titles[i] == titles[i+1]
              || wgNamespaceNumber == 14 && titles[i] == wgTitle
             )
          {
            titles.splice (i, 1);
            i--;
          }
        }
      }
      if (!titles || titles.length === 0) {
        if (this.list) this.list.style.display = 'none';
        if (this.engineSelector) this.engineSelector.style.display = 'none';
        if (engineName && suggestionConfigs[engineName] && !suggestionConfigs[engineName].temp) {
          if (this.icon) this.icon.src = armorUri(HotCat.existsNo);
          this.inputExists = false;
        }
        return;
      }

      var firstTitle = titles[0];
      var completed = this.autoComplete (firstTitle, v, key, dontAutocomplete);
      if (engineName && suggestionConfigs[engineName] && !suggestionConfigs[engineName].temp) {
        this.icon.src = armorUri(completed ? HotCat.existsYes : HotCat.existsNo);
        this.inputExists = completed;
      }
      if (completed) {
        this.lastInput = firstTitle;
        if (titles.length === 1) {
          this.list.style.display = 'none';
          if (this.engineSelector) this.engineSelector.style.display = 'none';
          return;
        }
      }
      // (Re-)fill the list
      while (this.list.firstChild) this.list.removeChild (this.list.firstChild);
      for (var i = 0 ; i < titles.length ; i++) {
        var opt = make ('option') ;
        opt.appendChild (make (titles[i], true));
        opt.selected = completed && (i === 0);
        this.list.appendChild (opt);
      }
      this.displayList();
    },

    displayList : function () {
      this.showsList = true;
      if (!this.is_active) {
        this.list.style.display = 'none';
        if (this.engineSelector) this.engineSelector.style.display = 'none';
        return;
      }
      var nofItems = (this.list.options.length > HotCat.list_size ? HotCat.list_size : this.list.options.length);
      if (nofItems <= 1) nofItems = 2;
      this.list.size = nofItems;
      this.list.style.align    = is_rtl ? 'right' : 'left';
      this.list.style.zIndex   = 5;
      this.list.style.position = 'absolute';
      // Compute initial list position. First the height.
      var listh = 0;
      if (this.list.style.display == 'none') {
        // Off-screen display to get the height
        this.list.style.top = this.text.offsetTop + 'px';
        this.list.style.left = '-10000px';
        this.list.style.display = "";
        listh = this.list.offsetHeight;
        this.list.style.display = 'none';
      } else {
        listh = this.list.offsetHeight;
      }
      // Approximate calculation of maximum list size
      var maxListHeight = listh;
      if (nofItems < HotCat.list_size) maxListHeight = (listh / nofItems) * HotCat.list_size;

      function scroll_offset (what) {
        var s = 'scroll' + what;
        return (document.documentElement ? document.documentElement[s] : 0)
               || document.body[s] || 0;
      }
      function viewport (what) {
        if (is_webkit && !document.evaluate)
          return window['inner' + what]; // Safari < 3.0
        var s = 'client' + what;
        if (window.opera) return document.body[s];
        return (document.documentElement ? document.documentElement[s] : 0)
               || document.body[s] || 0;
      }
      function position (node) {
        // Stripped-down simplified position function. It's good enough for our purposes.
        if (node.getBoundingClientRect) {
          var box    = node.getBoundingClientRect ();
          return { x : Math.round (box.left + scroll_offset ('Left'))
                  ,y : Math.round (box.top + scroll_offset ('Top'))
                 };
        }
        var t = 0, l = 0;
        do {
          t = t + (node.offsetTop  || 0);
          l = l + (node.offsetLeft || 0);
          node = node.offsetParent;
        } while (node);
        return {x : l, y : t};
      }

      var textPos = position (this.text);
      var nl = 0;
      var nt = 0;
      var offset = 0;
      // Opera 9.5 somehow has offsetWidth = 0 here?? Use the next best value...
      var textBoxWidth = this.text.offsetWidth || this.text.clientWidth;
      if (this.engineName) {
        this.engineSelector.style.zIndex = 5;
        this.engineSelector.style.position = 'absolute';
        this.engineSelector.style.width = textBoxWidth + 'px'; 
        // Figure out the height of this selector: display it off-screen, then hide it again.
        if (this.engineSelector.style.display == 'none') {
          this.engineSelector.style.left  = '-10000px';
          this.engineSelector.style.top   = '0px';
          this.engineSelector.style.display = "";
          offset = this.engineSelector.offsetHeight;
          this.engineSelector.style.display = 'none';
        } else {
          offset = this.engineSelector.offsetHeight;
        }
        this.engineSelector.style.left  = nl + 'px';
      }
      if (textPos.y < maxListHeight + offset + 1) {
        // The list might extend beyond the upper border of the page. Let's avoid that by placing it
        // below the input text field.
        nt = this.text.offsetHeight + offset + 1;
        if (this.engineName) this.engineSelector.style.top = this.text.offsetHeight + 'px';
      } else {
        nt = - listh - offset - 1;
        if (this.engineName) this.engineSelector.style.top = - (offset + 1) + 'px';
      }
      this.list.style.top = nt + 'px';
      this.list.style.width = ""; // No fixed width (yet)
      this.list.style.left = nl + 'px';
      if (this.engineName) {
        this.selectEngine (this.engineName);
        this.engineSelector.style.display = "";
      }
      this.list.style.display = 'block';
      // Set the width of the list
      var scroll = scroll_offset ('Left');
      var view_w = viewport ('Width');
      var l_pos  = position (this.list);
      if (this.list.offsetWidth < textBoxWidth ) {
        this.list.style.width = textBoxWidth + 'px';
        return;
      }
      // Make sure that the list fits horizontally into the browser window
      var w      = this.list.offsetWidth;
      if (l_pos.x + w > scroll + view_w) {
        if (w > view_w) w = view_w;
        this.list.style.width = w + 'px';
        this.list.style.left = nl - (l_pos.x + w - scroll - view_w) + 'px';
      }
    },

    autoComplete : function (newVal, actVal, key, dontModify) {
      if (newVal == actVal) return true;
      if (dontModify || newVal.indexOf (actVal) != 0) return false;
      // Actual input is a prefix of the new text. Fill in new text, selecting the newly added suffix
      // such that it can be easily removed by typing backspace if the suggestion is unwanted.
      if (!this.canSelect()) return false;
      // If we can't select properly, autocompletion would be a major annoyance to the user.
      this.text.focus();
      this.text.value = newVal + key;
      this.setSelection (actVal.length, newVal.length);
      return true;
    },

    canSelect : function () {
      return    this.text.setSelectionRange
               || this.text.createTextRange
               ||    typeof (this.text.selectionStart) != 'undefined'
                  && typeof (this.text.selectionEnd) != 'undefined';
    },

    setSelection : function (from, to) {
      // this.text must be focused (at least on IE)
      if (!this.text.value) return;
      if (this.text.setSelectionRange) {    // e.g. khtml
        this.text.setSelectionRange (from, to);
      } else if (typeof (this.text.selectionStart) != 'undefined') {
        if (from > this.text.selectionStart) {
          this.text.selectionEnd   = to;
          this.text.selectionStart = from;
        } else {
          this.text.selectionStart = from;
          this.text.selectionEnd   = to;
        }
      } else if (this.text.createTextRange) { // IE
        var new_selection = this.text.createTextRange();
        new_selection.move ('character', from);
        new_selection.moveEnd ('character', to - from);
        new_selection.select();
      }
    },

    getSelection : function () {
      var from = 0, to = 0;
      // this.text must be focused (at least on IE)
      if (!this.text.value) {
        // No text.
      } else if (typeof (this.text.selectionStart) != 'undefined') {
        from = this.text.selectionStart;
        to   = this.text.selectionEnd;
      } else if (document.selection && document.selection.createRange) { // IE
        var rng = document.selection.createRange().duplicate();
        if (rng.parentElement() === this.text) {
          try {
            var textRng = this.text.createTextRange();
            textRng.move('character', 0);
            textRng.setEndPoint('EndToEnd', rng);
            // We're in a single-line input box: no need to care about IE's strange
            // handling of line ends
            to = textRng.text.length;
            textRng.setEndPoint('EndToStart', rng);
            from = textRng.text.length;
          } catch (notFocused) {
            from = this.text.value.length; to = from; // At end of text
          }
        }
      }
      return {start: from, end: to};
    },

    saveView : function (evt) {
      this.lastSelection = this.getSelection ();
    },

    processKey : function (evt) {
      var dir = 0;
      switch (this.lastKey) {
        case 38: dir = -1; // Up arrow
        case 40: if (dir === 0) dir = 1; // Down arrow
        case 33: if (dir === 0) dir = -HotCat.list_size; // Page up
        case 34: if (dir === 0) dir = HotCat.list_size; // Page down
          if (this.list.style.display != 'none') {
            // List is visible, so there are suggestions
            this.highlightSuggestion (dir);
            // Kill the event, otherwise some browsers (e.g., Firefox) may additionally treat an up-arrow
            // as "place the text cursor at the front", which we don't want here.
            return evtKill (evt);
          } else if (   this.keyCount <= 1
                     && (!this.callbackObj || this.callbackObj.callsMade == this.callbackObj.nofCalls)
                    )
          {
            // If no suggestions displayed, get them, unless we're already getting them.
            this.textchange ();
          }
          break;
        case 27: // ESC: inhibit default behavior (revert to last real input in FF: we do that ourselves)
          return evtKill (evt);
      }
      return true;
    },

    highlightSuggestion : function (dir) {
      if (noSuggestions || !this.list || this.list.style.display == 'none') return false;
      var curr = this.list.selectedIndex;
      var tgt  = -1;
      if (dir === 0) {
        if (curr < 0 || curr >= this.list.options.length) return false;
        tgt = curr;
      } else {
        tgt = curr < 0 ? 0 : curr + dir;
        tgt = tgt < 0 ? 0 : tgt;
        if (tgt >= this.list.options.length) tgt = this.list.options.length - 1;
      }
      if (tgt != curr || dir === 0) {
        if (curr >= 0 && curr < this.list.options.length && dir != 0) this.list.options[curr].selected = false;
        this.list.options[tgt].selected = true;
        // Get current input text
        var v = this.text.value.split('|');
        var key = v.length > 1 ? '|' + v[1] : "";
        var completed = this.autoComplete (this.list.options[tgt].text, this.lastRealInput, key, false);
        if (!completed) {
          this.text.value = this.list.options[tgt].text + key;
        }
        this.lastInput = this.list.options[tgt].text;
        this.inputExists = true; // Might be wrong if from a dab list...
        if (this.icon) this.icon.src = armorUri(HotCat.existsYes);
        this.state = CategoryEditor.CHANGE_PENDING;
      }
      return true;
    },

    resetKeySelection : function () {
      if (noSuggestions || !this.list || this.list.style.display == 'none') return false;
      var curr = this.list.selectedIndex;
      if (curr >= 0 && curr < this.list.options.length) {
        this.list.options[curr].selected = false;
        // Get current input text
        var v = this.text.value.split('|');
        var key = v.length > 1 ? '|' + v[1] : "";
        // ESC is handled strangely by some browsers (e.g., FF); somehow it resets the input value before
        // our event handlers ever get a chance to run.
        var result = v[0] != this.lastInput;
        if (v[0] != this.lastRealInput) {
          this.text.value = this.lastRealInput + key;
          result = true;
        }
        this.lastInput = this.lastRealInput;
        return result;
      }
      return false;
    }

  }; // end CategoryEditor.prototype

  function initialize () {
    // User configurations. Do this here, called from the onload handler, so that users can
    // override it easily in their own user script files by just declaring variables. JSconfig
    // is some feature used at Wikimedia Commons.
    var config = (typeof (JSconfig) != 'undefined' && JSconfig.keys) ? JSconfig.keys : {};  
    HotCat.dont_add_to_watchlist =
      (typeof (window.hotcat_dont_add_to_watchlist) != 'undefined'
        ? !!window.hotcat_dont_add_to_watchlist
        : (typeof (config['HotCatDontAddToWatchlist']) != 'undefined'
            ? config['HotCatDontAddToWatchlist']
            : HotCat.dont_add_to_watchlist
          )
      );
    HotCat.no_autocommit =
      (typeof (window.hotcat_no_autocommit) != 'undefined'
        ? !!window.hotcat_no_autocommit
        : (typeof (config['HotCatNoAutoCommit']) != 'undefined'
            ? config['HotCatNoAutoCommit']
            : HotCat.no_autocommit
          )
      );
    HotCat.suggest_delay =   window.hotcat_suggestion_delay
                          || config['HotCatSuggestionDelay']
                          || HotCat.suggest_delay;
    HotCat.editbox_width =   window.hotcat_editbox_width
                          || config['HotCatEditBoxWidth']
                          || HotCat.editbox_width;
    HotCat.suggestions   =   window.hotcat_suggestions
                          || config['HotCatSuggestions']
                          || HotCat.suggestions;
    if (typeof (HotCat.suggestions) != 'string' || !suggestionConfigs[HotCat.suggestions])
      HotCat.suggestions = 'combined';
    HotCat.fixed_search  =
      (typeof (window.hotcat_suggestions_fixed) != 'undefined'
        ? !!window.hotcat_suggestions_fixed
        : (typeof (config['HotCatFixedSuggestions']) != 'undefined'
            ? config['HotCatFixedSuggestions']
            : HotCat.fixed_search
          )
      );
    HotCat.single_minor  =
      (typeof (window.hotcat_single_changes_are_minor) != 'undefined'
        ? !!window.hotcat_single_changes_are_minor
        : (typeof (config['HotCatMinorSingleChanges']) != 'undefined'
            ? config['HotCatMinorSingleChanges']
            : HotCat.single_minor
          )
      );
    HotCat.bg_changed    =   window.hotcat_changed_background
                          || config['HotCatChangedBackground']
                          || HotCat.bg_changed;
    HotCat.use_up_down   =
      (typeof (window.hotcat_use_category_links) != 'undefined'
        ? !!window.hotcat_use_category_links
        : (typeof (config['HotCatUseCategoryLinks']) != 'undefined'
            ? config['HotCatUseCategoryLinks']
            : HotCat.use_up_down
          )
      );
    HotCat.list_size =    window.hotcat_list_size
                       || config['HotCatListSize']
                       || HotCat.list_size;
    // Numeric input, make sure we have a numeric value
    HotCat.list_size = parseInt (HotCat.list_size, 10);
    if (isNaN (HotCat.list_size) || HotCat.list_size < 5) HotCat.list_size = 5;
    if (HotCat.list_size > 15) HotCat.list_size = 15;
    // Localize search engine names
    if (HotCat.engine_names) {
      for (var key in HotCat.engine_names) {
        if (suggestionConfigs[key] && HotCat.engine_names[key]) {
          suggestionConfigs[key].name = HotCat.engine_names[key];
        }
      }
    }
    // Catch both native RTL and "faked" RTL through [[MediaWiki:Rtl.js]]
    is_rtl = hasClass (document.body, 'rtl');
    if (!is_rtl) {
      if (document.defaultView && document.defaultView.getComputedStyle) { // Gecko etc.
        is_rtl = document.defaultView.getComputedStyle (document.body, null).getPropertyValue ('direction');
      } else if (document.body.currentStyle) { // IE, has subtle differences to getComputedStyle
        is_rtl = document.body.currentStyle['direction'];
      } else { // Not exactly right, but best effort
        is_rtl = document.body.style['direction'];
      }
      is_rtl = (is_rtl == 'rtl');
    }
  }

  function can_edit () {
    var container = null;
    switch (skin) {
      case 'cologneblue':
        container = document.getElementById ('quickbar');
        // Fall through
      case 'standard':
      case 'nostalgia':
        if (!container) container = document.getElementById ('topbar');
        var lks = container.getElementsByTagName ('a');
        for (var i = 0; i < lks.length; i++) {
          if (   param ('title', lks[i].href) == wgPageName
              && param ('action', lks[i].href) == 'edit')
            return true;
        }
        return false;
      default:
        // all modern skins:
        return document.getElementById ('ca-edit') != null;
    }
    return false;
  }

  function setup_upload () {
    onUpload = true;
    // Add an empty category bar at the end of the table containing the description, and change the onsubmit handler.
    var ip = document.getElementById ('mw-htmlform-description') || document.getElementById ('wpDestFile');
    if (!ip) {
      ip = document.getElementById ('wpDestFile');
      while (ip && ip.nodeName.toLowerCase() != 'table') ip = ip.parentNode;
    }
    if (!ip) return;
    var reupload = document.getElementById ('wpForReUpload');
    var destFile = document.getElementById ('wpDestFile');
    if (   (reupload && !!reupload.value)
        || (destFile && (destFile.disabled || destFile.readOnly)))
      return; // re-upload form...
    // Insert a table row with two fields (label and empty category bar)
    var labelCell = make ('td');
    var lineCell  = make ('td');
    // Create the category line
    catLine = make ('div');
    catLine.className = 'catlinks';
    catLine.id = 'catlinks';
    catLine.style.textAlign = is_rtl ? 'right' : 'left';
    // We'll be inside a table row. Make sure that we don't have margins or strange borders.
    catLine.style.margin = '0';
    catLine.style.border = 'none';
    lineCell.appendChild (catLine);
    // Create the label
    var label = null;
    if (   typeof (UFUI) != 'undefined'
        && typeof (UIElements) != 'undefined'
        && typeof (UFUI.getLabel) == 'function') {
      try {
        label = UFUI.getLabel ('wpCategoriesUploadLbl');
      } catch (ex) {
        label = null;
      }
    }
    if (!label) {
      labelCell.id = 'hotcatLabel';
      labelCell.appendChild (make (HotCat.categories, true));
    } else {
      labelCell.id = 'hotcatLabelTranslated';
      labelCell.appendChild (label);
    }
    labelCell.className           = 'mw-label';
    labelCell.style.textAlign     = 'right';
    labelCell.style.verticalAlign = 'middle';
    // Change the onsubmit handler
    var form = document.getElementById ('upload') || document.getElementById ('mw-upload-form');
    if (form) {
      var newRow = ip.insertRow (-1);
      newRow.appendChild (labelCell);
      newRow.appendChild (lineCell);
      form.onsubmit = (function (oldSubmit) {
        return function () {
          var do_submit = true;
          if (oldSubmit) {
            if (typeof (oldSubmit) == 'string')
              do_submit = eval (oldSubmit);
            else if (typeof (oldSubmit) == 'function')
              do_submit = oldSubmit.apply (form, arguments);
          }
          if (!do_submit) return false;
          closeForm ();
          // Copy the categories
          var eb =    document.getElementById ('wpUploadDescription')
                   || document.getElementById ('wpDesc');
          var addedOne = false;
          for (var i = 0; i < editors.length; i++) {
            var t = editors[i].currentCategory;
            if (!t) continue ;
            var key = editors[i].currentKey;
            var new_cat = '[[' + HotCat.category_canonical + ':' + t + (key ? '|' + key : "") + ']]';
            // Only add if not already present
            var cleanedText = eb.value.replace(/<\!--(\s|\S)*?--\>/g, "")
                                      .replace(/<nowiki\>(\s|\S)*?<\/nowiki>/g, "");
            if (!find_category (cleanedText, t, true)) {
              eb.value += '\n' + new_cat;
              addedOne = true;
            }
          }
          if (addedOne) {
            // Remove "subst:unc" added by Flinfo if it didn't find categories
            eb.value = eb.value.replace(/\{\{subst:unc\}\}/g, "");
          }
          return true;
        };
      }) (form.onsubmit);
    }
  }

  var cleanedText = null;

  function isOnPage (span) {
    var catTitle = title (span.firstChild.getAttribute ('href', 2));
    if (!catTitle) return null;
    catTitle = catTitle.substr (catTitle.indexOf (':') + 1).replace (/_/g, ' ');
    if (HotCat.blacklist != null && HotCat.blacklist.test (catTitle)) return null;
    var result = { title : catTitle, match : ["", "", ""] };
    if (pageText === null) return result;
    if (cleanedText === null) {
      cleanedText = pageText.replace(/<\!--(\s|\S)*?--\>/g, "")
                            .replace(/<nowiki\>(\s|\S)*?<\/nowiki>/g, "");
    }
    result.match = find_category (cleanedText, catTitle, true);
    return result;
  }

  var initialized = false;
  var setupTimeout = null;

  function setup (additionalWork) {
    if (initialized) return;
    initialized = true;
    if (setupTimeout) {
      window.clearTimeout (setupTimeout);
      setupTimeout = null;
    }
    // Find the category bar, or create an empty one if there isn't one. Then add -/+- links after
    // each category, and add the + link.
    catLine =   catLine                                                  // Special:Upload
             || document.getElementById ('mw-normal-catlinks')           // MW >= 1.13alpha
             || getElementsByClassName (document , 'p' , 'catlinks')[0]; // MW < 1.13
    var hiddenCats = document.getElementById ('mw-hidden-catlinks');
    if (!catLine) {
      var footer = null;
      if (!hiddenCats) {
        footer = getElementsByClassName (document , 'div' , 'printfooter')[0];
        if (!footer) return; // Don't know where to insert the category line
      }
      catLine = make ('div');
      catLine.id = 'mw-normal-catlinks';
      catLine.style.textAlign = is_rtl ? 'right' : 'left';
      // Add a label
      var label = make ('a');
      label.href  = wgArticlePath.replace ('$1', 'Special:Categories');
      label.title = HotCat.categories;
      label.appendChild (make (HotCat.categories, true));
      catLine.appendChild (label);
      catLine.appendChild (make (':', true));
      // Insert the new category line
      var container = (hiddenCats ? hiddenCats.parentNode : document.getElementById ('catlinks'));
      if (!container) {
         container = make ('div');
         container.id = 'catlinks';
         footer.parentNode.insertBefore (container, footer.nextSibling);
      }
      container.className = 'catlinks noprint';
      container.style.display = "";
      if (!hiddenCats) {
        container.appendChild (catLine);
      } else {
        container.insertBefore (catLine, hiddenCats);
      }
    } // end if catLine exists
    if (is_rtl) catLine.dir = 'rtl';

    // Create editors for all existing categories

    function createEditors (line, is_hidden) {
      var cats = line.getElementsByTagName ('li');
      if (cats.length > 0) {
        newDOM = true; line = cats[0].parentNode;
      } else {
        cats = line.getElementsByTagName ('span');
      }
      // Copy cats, otherwise it'll also magically contain our added spans as it is a live collection!
      var copyCats = new Array (cats.length);
      for (var i = 0; i < cats.length; i++) copyCats[i] = cats[i];
      var editor = null;
      for (var i = 0; i < copyCats.length; i++) {
        var test = isOnPage (copyCats[i]);
        if (test !== null && test.match !== null) {
          editor = new CategoryEditor (line, copyCats[i], test.title, test.match[2], is_hidden);
        }
      }
      return copyCats.length > 0 ? copyCats[copyCats.length-1] : null;
    }

    var lastSpan = createEditors (catLine, false);
    // Create one to add a new category
    var editor = new CategoryEditor(newDOM ? catLine.getElementsByTagName('ul')[0] : catLine, null, null, lastSpan != null, false);
    if (!onUpload) {
      if (pageText !== null && hiddenCats) {
        if (is_rtl) hiddenCats.dir = 'rtl';
        createEditors (hiddenCats, true);
      }
      // And finally add the "multi-mode" span. (Do this at the end, otherwise it ends up in the list above.)
      var enableMulti = make ('span');
      enableMulti.className = 'noprint';
      if (is_rtl) enableMulti.dir = 'rtl';
      catLine.insertBefore (enableMulti, catLine.firstChild.nextSibling);
      enableMulti.appendChild (make ('\xa0', true)); // nbsp
      multiSpan = make ('span');
      enableMulti.appendChild (multiSpan);
      multiSpan.innerHTML = '(<a>' + HotCat.addmulti + '</a>)';
      var lk = multiSpan.getElementsByTagName ('a')[0];
      lk.onclick = function (evt) {setMultiInput (); checkMultiInput (); return evtKill (evt);};
      lk.title = HotCat.multi_tooltip;
      lk.style.cursor = 'pointer';
    }
    cleanedText = null;
    if (typeof (additionalWork) == 'function') additionalWork();
    setupCompleted.loaded(); // Trigger signal; execute registered functions
    if (window.jQuery) window.jQuery('body').trigger ('hotcatSetupCompleted');
  }

  function setPage (json) {
    var startTime = null;
    if (json && json.query) {
      if (json.query.pages) {
        var page = json.query.pages[wgArticleId == 0 ? "-1" : "" + wgArticleId];
        if (page) {
          if (page.revisions && page.revisions.length > 0) {
            // Revisions are sorted by revision ID, hence [0] is the one we asked for, and possibly there's a [1] if we're
            // not on the latest revision (edit conflicts and such).
            pageText = page.revisions[0]['*'];
            if (page.revisions[0].timestamp) pageTime = page.revisions[0].timestamp.replace (/\D/g, "");
            if (page.revisions[0].revid) pageTextRevId = page.revisions[0].revid;
            if (page.revisions.length > 1) conflictingUser = page.revisions[1].user;
          }
          if (page.lastrevid) lastRevId = page.lastrevid;
          if (page.starttimestamp) startTime = page.starttimestamp.replace (/\D/g, "");
          pageWatched = typeof (page.watched) == 'string';
          editToken = page.edittoken;
          if (page.langlinks && (!json['query-continue'] || !json['query-continue'].langlinks)) {
            // We have interlanguage links, and we got them all.
            var re = "";
            for (var i = 0; i < page.langlinks.length; i++) {
              re += (i > 0 ? '|' : "") + page.langlinks[i].lang.replace(/([\\\^\$\.\?\*\+\(\)])/g, '\\$1');
            }
            if (re.length > 0) {
              interlanguageRE = new RegExp ('((^|\\n\\r?)(\\[\\[\\s*(' + re + ')\\s*:[^\\]]+\\]\\]\\s*))+$');
            }
          }

        }
      }
      // Siteinfo
      if (json.query.general) {
        HotCat.capitalizePageNames = (json.query.general['case'] == 'first-letter');
        if (json.query.general.time && !startTime) startTime = json.query.general.time.replace (/\D/g, "");
      }
      serverTime = startTime;
      // Userinfo
      if (json.query.userinfo && json.query.userinfo.options) {
        watchCreate = !HotCat.dont_add_to_watchlist && json.query.userinfo.options.watchcreations == '1';
        watchEdit   = !HotCat.dont_add_to_watchlist && json.query.userinfo.options.watchdefault == '1';
        minorEdits  = json.query.userinfo.options.minordefault == 1;
        // If the user has the "All edits are minor" preference enabled, we should honor that
        // for single category changes, no matter what the site configuration is.
        if (minorEdits) HotCat.single_minor = true;
      }
    }
  }

  function createCommitForm () {
    if (commitForm) return;
    var formContainer = make ('div');
    formContainer.style.display = 'none';
    document.body.appendChild (formContainer);
    formContainer.innerHTML =
        '<form id="hotcatCommitForm" method="post" enctype="multipart/form-data" action="'
      + wgScript + '?title=' + encodeURIComponent (wgPageName)
      + '&action=edit">'
      + '<input type="hidden" name="wpTextbox1" />'
      + '<input type="hidden" name="wpSummary" value="" />'
      + '<input type="checkbox" name="wpMinoredit" value="1" />'
      + '<input type="checkbox" name="wpWatchthis" value="1" />'
      + '<input type="hidden" name="wpAutoSummary" value="" />'
      + '<input type="hidden" name="wpEdittime" />'
      + '<input type="hidden" name="wpStarttime" />'
      + '<input type="hidden" name="wpEditToken" />'
      + '<input type="hidden" name="wpDiff" value="wpDiff" />'
      + '<input type="hidden" name="oldid" value="0" />'
      + '<input type="submit" name="hcCommit" value="hcCommit" />'
      + '</form>';
    commitForm = document.getElementById ('hotcatCommitForm');
  }

  function getPage () {
    // We know we have an article here.
    if (wgArticleId === 0) {
      // Doesn't exist yet.
      pageText = "";
      pageTime = null;
      setup (createCommitForm);
    } else {
      var url = wgServer + wgScriptPath + '/api.php?format=json&callback=HotCat.start&action=query&titles='
              + encodeURIComponent (wgPageName)
              + '&prop=info%7Crevisions&rvprop=content%7Ctimestamp%7Cids&meta=siteinfo&rvlimit=1&rvstartid='
              + wgCurRevisionId;
      var s = make ('script');
      s.src = armorUri(url);
      s.type = 'text/javascript';
      HotCat.start = function (json) { setPage (json); setup (createCommitForm); };
      document.getElementsByTagName ('head')[0].appendChild (s);
      setupTimeout = window.setTimeout (function () {setup (createCommitForm);}, 4000); // 4 sec, just in case getting the wikitext takes longer.
    }
  }

  function run () {
    if (HotCat.started) return;
    HotCat.started = true;
    loadTrigger.register(really_run);
  }

  function really_run () {
    initialize ();

    if (is_rtl && is_ie6) return; // Disabled! IE6 with RTL is just too broken...
    if (!HotCat.upload_disabled && wgNamespaceNumber === -1 && wgCanonicalSpecialPageName == 'Upload' && wgUserName) {
      setup_upload ();
      setup (function () {
        // Check for state restoration once the setup is done otherwise, but before signalling setup completion
        if (   typeof (UploadForm) != 'undefined'
            && typeof (UploadForm.previous_hotcat_state) != 'undefined'
            && UploadForm.previous_hotcat_state != null) {
          UploadForm.previous_hotcat_state = setState (UploadForm.previous_hotcat_state);
        }
      });
    } else {
      if (!wgIsArticle || wgAction != 'view' || param('diff') != null || param('oldid') != null || !can_edit() || HotCat.disable()) return;
      getPage ();
    }
  }

  // Legacy stuff

  function closeForm () {
    // Close all open editors without redirect resolution and other asynchronous stuff.
    for (var i = 0; i < editors.length; i++) {
      if (editors[i].state == CategoryEditor.OPEN) {
        editors[i].cancel();
      } else if (editors[i].state == CategoryEditor.CHANGE_PENDING) {
        editors[i].sanitizeInput ();
        var value = editors[i].text.value.split('|');
        var key   = null;
        if (value.length > 1) key = value[1];
        var v = value[0].replace(/_/g, ' ').replace(/^\s+|\s+$/g, "");
        if (v.length === 0) {
          editors[i].cancel ();
        } else {
          editors[i].currentCategory = v;
          editors[i].currentKey = key;
          editors[i].currentExists = this.inputExists;
          editors[i].close ();
        }
      }
    }
  }

  function getState () {
    var result = null;
    for (var i = 0; i < editors.length; i++) {
      var text = editors[i].currentCategory;
      var key  = editors[i].currentKey;
      if (text && text.length > 0) {
        if (key != null) text += '|' + key;
        if (result == null)
          result = text;
        else
          result = result + '\n' + text;
      }
    }
    return result;
  }

  function setState (state) {
    var cats = state.split ('\n');
    if (cats.length === 0) return null;
    if (initialized && editors.length == 1 && editors[0].isAddCategory) {
      // Insert new spans and create new editors for them.
      var newSpans = [];
      var before = editors.length == 1 ? editors[0].span : null;
      for (var i = 0; i < cats.length; i++) {
        if (cats[i].length === 0) continue;
        var cat = cats[i].split ('|');
        var key = cat.length > 1 ? cat[1] : null;
        cat = cat[0];
        var lk = make ('a'); lk.href = wikiPagePath (HotCat.category_canonical + ':' + cat);
        lk.appendChild (make (cat, true));
        lk.title = cat;
        var span = make ('span');
        span.appendChild (lk);
        if (i === 0) catLine.insertBefore (make (' ', true), before);
        catLine.insertBefore (span, before);
        if (before && i+1 < cats.length) parent.insertBefore (make (' | ', true), before);
        newSpans.push ({element: span, title: cat, 'key': key});
      }
      // And change the last one...
      if (before) {
        before.parentNode.insertBefore (make (' | ', true), before);
      }
      var editor = null;
      for (var i = 0; i < newSpans.length; i++) {
        editor = new CategoryEditor (catLine, newSpans[i].element, newSpans[i].title, newSpans[i].key);
      }
    }
    return null;
  }

  // Now export these legacy functions
  window.hotcat_get_state  = function () { return getState(); };
  window.hotcat_set_state  = function (state) { return setState (state); };
  window.hotcat_close_form = function () { closeForm (); };

  if (window.mediaWiki && window.mediaWiki.config) {
    // Make sure we don't get conflicts with AjaxCategories (core development that should one day
    // replace HotCat).
    window.mediaWiki.config.set('disableAJAXCategories', true);
  }
  if (window.jQuery) {
    window.jQuery(document).ready(run);
  } else {
    addOnloadHook (run);
  }
})();

} // end if (guard)
//</source>
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