Fixed a bunch of silly instances of [^!=]==\s*(true|false)
[lhc/web/wiklou.git] / includes / OutputPage.php
index 204163a..3812ce1 100644 (file)
@@ -1,6 +1,7 @@
 <?php
-if ( ! defined( 'MEDIAWIKI' ) )
+if ( !defined( 'MEDIAWIKI' ) ) {
        die( 1 );
+}
 
 /**
  * @todo document
@@ -12,9 +13,7 @@ class OutputPage {
        var $mHTMLtitle = '', $mIsarticle = true, $mPrintable = false;
        var $mSubtitle = '', $mRedirect = '', $mStatusCode;
        var $mLastModified = '', $mETag = false;
-       var $mCategoryLinks = array(), $mLanguageLinks = array();
-
-       var $mScriptLoaderClassList = array();
+       var $mCategoryLinks = array(), $mCategories = array(), $mLanguageLinks = array();
 
        var $mScripts = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();
        var $mInlineMsg = array();
@@ -23,13 +22,13 @@ class OutputPage {
 
        var $mAllowUserJs;
        var $mSuppressQuickbar = false;
-       var $mOnloadHandler = '';
        var $mDoNothing = false;
        var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
        var $mIsArticleRelated = true;
        protected $mParserOptions = null; // lazy initialised, use parserOptions()
-       var $mShowFeedLinks = false;
-       var $mFeedLinksAppendQuery = false;
+
+       var $mFeedLinks = array();
+
        var $mEnableClientCache = true;
        var $mArticleBodyOnly = false;
 
@@ -40,6 +39,7 @@ class OutputPage {
        var $mParseWarnings = array();
        var $mSquidMaxage = 0;
        var $mRevisionId = null;
+       var $mPageIcons = array();
        protected $mTitle = null;
 
        /**
@@ -49,8 +49,17 @@ class OutputPage {
         */
        var $styles = array();
 
+       /**
+        * Whether to load jQuery core.
+        */
+       protected $mJQueryDone = false;
+
        private $mIndexPolicy = 'index';
        private $mFollowPolicy = 'follow';
+       private $mVaryHeader = array(
+               'Accept-Encoding' => array( 'list-contains=gzip' ),
+               'Cookie' => null
+       );
 
        /**
         * Constructor
@@ -61,12 +70,23 @@ class OutputPage {
                $this->mAllowUserJs = $wgAllowUserJs;
        }
 
+       /**
+        * Redirect to $url rather than displaying the normal page
+        *
+        * @param $url String: URL
+        * @param $responsecode String: HTTP status code
+        */
        public function redirect( $url, $responsecode = '302' ) {
                # Strip newlines as a paranoia check for header injection in PHP<5.1.2
                $this->mRedirect = str_replace( "\n", '', $url );
                $this->mRedirectCode = $responsecode;
        }
 
+       /**
+        * Get the URL to redirect to, or an empty string if not redirect URL set
+        *
+        * @return String
+        */
        public function getRedirect() {
                return $this->mRedirect;
        }
@@ -74,10 +94,12 @@ class OutputPage {
        /**
         * Set the HTTP status code to send with the output.
         *
-        * @param int $statusCode
+        * @param $statusCode Integer
         * @return nothing
         */
-       function setStatusCode( $statusCode ) { $this->mStatusCode = $statusCode; }
+       public function setStatusCode( $statusCode ) {
+               $this->mStatusCode = $statusCode;
+       }
 
        /**
         * Add a new <meta> tag
@@ -90,265 +112,115 @@ class OutputPage {
                array_push( $this->mMetatags, array( $name, $val ) );
        }
 
+       /**
+        * Add a keyword or a list of keywords in the page header
+        *
+        * @param $text String or array of strings
+        */
        function addKeyword( $text ) {
-               if( is_array( $text )) {
+               if( is_array( $text ) ) {
                        $this->mKeywords = array_merge( $this->mKeywords, $text );
                } else {
                        array_push( $this->mKeywords, $text );
                }
        }
-       function addScript( $script ) {
-               $this->mScripts .= $script . "\n";
-       }
 
        /**
-        * Register and add a stylesheet from an extension directory.
-        * @param $url String path to sheet.  Provide either a full url (beginning
-        *             with 'http', etc) or a relative path from the document root
-        *             (beginning with '/').  Otherwise it behaves identically to
-        *             addStyle() and draws from the /skins folder.
+        * Add a new \<link\> tag to the page header
+        *
+        * @param $linkarr Array: associative array of attributes.
         */
-       public function addExtensionStyle( $url ) {
-               array_push( $this->mExtStyles, $url );
+       function addLink( $linkarr ) {
+               array_push( $this->mLinktags, $linkarr );
        }
 
        /**
-        * Add a JavaScript file out of skins/common, or a given relative path.
-        * @param string $file filename in skins/common or complete on-server path (/foo/bar.js)
+        * Add a new \<link\> with "rel" attribute set to "meta"
+        *
+        * @param $linkarr Array: associative array mapping attribute names to their
+        *                 values, both keys and values will be escaped, and the
+        *                 "rel" attribute will be automatically added
         */
-       function addScriptFile( $file ) {
-               global $wgStylePath, $wgScript, $wgUser;
-               global $wgEnableScriptLoader, $wgScriptPath;
-
-               if( substr( $file, 0, 1 ) == '/' ) {
-                       $path = $file;
-               } else {
-                       $path = "{$wgStylePath}/common/{$file}";
-               }
-
-               // If the class can be determined, use the addScriptClass method
-               $js_class = $this->getJsClassFromPath( $path );
-               if( $js_class ) {
-                       $this->addScriptClass( $js_class );
-                       return true;
-               }
-
-               //do checks for wiki-titles
-               if( strpos( $path, $wgScript ) !== false ) {
-                       $reqPath = str_replace( $wgScript . '?', '', $path );
-                       $reqArgs = explode( '&', $reqPath );
-                       $reqSet = array();
-
-                       foreach( $reqArgs as $arg ) {
-                               list( $key, $var ) = explode( '=', $arg );
-                               $reqSet[$key] = $var;
-                       }
-
-                       if( isset( $reqSet['title'] ) && $reqSet != '' ) {
-                               $jsTitleClass = 'WT:' . $reqSet['title'];
-                               if( $wgEnableScriptLoader ) {
-                                       // Extract any extra parameters (for now just skin)
-                                       $ext_param = ( isset( $reqSet['useskin'] ) && $reqSet['useskin'] != '' )
-                                               ? '|useskin=' . ucfirst( $reqSet['useskin'] ) : '';
-                                       $this->mScriptLoaderClassList[] = $jsTitleClass . $ext_param ;
-                                       return true;
-                               }else{
-                                       $this->addScript( Html::linkedScript(
-                                                               wfAppendQuery( $path, $this->getURIDparam( $jsTitleClass ) )
-                                                       )
-                                               );
-                                       return true;
-                               }
-                       }
-               }
-               // If the script loader could not be used, just add the script to the header
-               $this->addScript( Html::linkedScript( wfAppendQuery( $path, $this->getURIDparam() ) ) );
+       function addMetadataLink( $linkarr ) {
+               # note: buggy CC software only reads first "meta" link
+               static $haveMeta = false;
+               $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
+               $this->addLink( $linkarr );
+               $haveMeta = true;
        }
 
        /**
-        * Add the core scripts that are included on every page, for later output into the header
+        * Add raw HTML to the list of scripts (including \<script\> tag, etc.)
         *
-        * this includes the conditional sitejs
+        * @param $script String: raw HTML
         */
-       function addCoreScripts2Top(){
-               global $wgEnableScriptLoader, $wgJSAutoloadLocalClasses, $wgScriptPath, $wgEnableJS2system;
-               global $wgUseSiteJs, $wgUser, $wgJsMimeType;
-               // @todo We should deprecate wikibits in favor of mv_embed and jQuery
-
-               if( $wgEnableJS2system ){
-                       $core_classes = array( 'window.jQuery', 'mv_embed', 'wikibits' );
-               } else {
-                       $core_classes = array( 'wikibits' );
-               }
-
-               //make sure scripts are on top:
-               $postScripts = $this->mScripts;
-               $this->mScripts = '';
-
-               if( $wgEnableScriptLoader ){
-                       //directly add script_loader call
-                       //(separate from other scriptloader calls that may include extensions with conditional js)
-                       $this->mScripts = $this->getScriptLoaderJs( $core_classes );
-               } else {
-                       $so = '';
-                       foreach( $core_classes as $js_class ){
-                               $this->addScriptClass( $js_class );
-                       }
-               }
-
-               $sk = $wgUser->getSkin();
-               //add site js:
-               if( $wgUseSiteJs ) {
-                       $jsCache = $wgUser->isLoggedIn() ? '&smaxage=0' : '';
-                       $this->addScriptFile(  Skin::makeUrl( '-',
-                                       "action=raw$jsCache&gen=js&useskin=" .
-                                       urlencode( $sk->getSkinName() )
-                                       )
-                               );
-               }
-               //now re-append any scripts that got added prior to the addCoreScripts2Top call
-               $this->mScripts = $this->mScripts . $postScripts;
+       function addScript( $script ) {
+               $this->mScripts .= $script . "\n";
        }
 
        /**
-        * @param string $js_class Name of the JavaScript class
-        * @return boolean False if the class wasn't found, true on success
+        * Register and add a stylesheet from an extension directory.
+        *
+        * @param $url String path to sheet.  Provide either a full url (beginning
+        *             with 'http', etc) or a relative path from the document root
+        *             (beginning with '/').  Otherwise it behaves identically to
+        *             addStyle() and draws from the /skins folder.
         */
-       function addScriptClass( $js_class ){
-               global $wgDebugJavaScript, $wgJSAutoloadLocalClasses, $wgJSAutoloadClasses,
-                               $wgEnableScriptLoader, $wgStyleVersion, $wgScriptPath, $wgEnableJS2system;
-
-               $path = jsScriptLoader::getJsPathFromClass( $js_class );
-               if( $path !== false ){
-                       if( $wgEnableScriptLoader ) {
-                               // Register it with the script loader
-                               if( !in_array( $js_class, $this->mScriptLoaderClassList ) ) {
-                                       $this->mScriptLoaderClassList[] = $js_class;
-                               }
-                       } else {
-                               // Source the script directly
-                               $path = $wgScriptPath . '/' . $path;
-                               $urlAppend = ( $wgDebugJavaScript ) ? time() : $this->getURIDparam( $js_class );
-                               $this->addScript( Html::linkedScript( "$path?$urlAppend" ) );
-
-                               //merge in language text (if js2 is on and we have loadGM function)
-                               if( $wgEnableJS2system ){
-                                       $inlineMsg = jsScriptLoader::getLocalizedMsgsFromClass( $js_class );
-                                       if( $inlineMsg != '' )
-                                               $this->addScript( Html::inlineScript( $inlineMsg ));
-                               }
-                       }
-                       return true;
-               }
-               print "could not find: $js_class\n";
-               wfDebug( __METHOD__ . ' could not find js_class: ' . $js_class );
-               return false; // could not find the class
+       public function addExtensionStyle( $url ) {
+               array_push( $this->mExtStyles, $url );
        }
 
        /**
-        * Get the <script> tag which will invoke the script loader
-        * @param $classAry A class array which, if given, overrides $this->mScriptLoaderClassList
+        * Get all links added by extensions
+        *
+        * @return Array
         */
-       function getScriptLoaderJs( $classAry = array() ) {
-               global $wgRequest, $wgDebugJavaScript;
-               // If no class array was provided, use mScriptLoaderClassList
-               if( !count( $classAry ) ) {
-                       $classAry = $this->mScriptLoaderClassList;
-               }
-               $class_list = implode( ',', $classAry );
-
-               $debug_param = ( $wgDebugJavaScript ||
-                                                $wgRequest->getVal( 'debug' ) == 'true' ||
-                                                $wgRequest->getVal( 'debug' ) == '1' )
-                                        ? '&debug=true' : '';
-
-               return Html::linkedScript( wfScript( 'mwScriptLoader' ) .
-                       "?class={$class_list}{$debug_param}&" . $this->getURIDparam( $classAry) );
+       function getExtStyle() {
+               return $this->mExtStyles;
        }
 
        /**
-        * Get the unique request ID parameter for the script-loader request
+        * Add a JavaScript file out of skins/common, or a given relative path.
+        *
+        * @param $file String: filename in skins/common or complete on-server path
+        *              (/foo/bar.js)
+        * @param $version String: style version of the file. Defaults to $wgStyleVersion
         */
-       function getURIDparam( $classAry = array() ) {
-               global $wgDebugJavaScript, $wgStyleVersion, $IP, $wgScriptModifiedCheck;
-               if( $wgDebugJavaScript ) {
-                       return 'urid=' . time();
+       public function addScriptFile( $file, $version = null ) {
+               global $wgStylePath, $wgStyleVersion;
+               if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {
+                       $path = $file;
                } else {
-                       //support single class_name attr
-                       if( gettype( $classAry) == 'string'  ){
-                               $classAry = array( $classAry );
-                       }
-                       $ftime =  $frev = 0;
-                       foreach( $classAry as $class ) {
-                               if( $wgScriptModifiedCheck ) {
-                                       $js_path =  jsScriptLoader::getJsPathFromClass( $class );
-                                       if( $js_path ) {
-                                               $cur_ftime = filemtime ( $IP ."/". $js_path );
-                                               if( $cur_ftime > $ftime )
-                                                       $ftime = $cur_ftime;
-                                       }
-                               }
-                               // Add the latest revision ID if the class set includes a WT (wiki title)
-                               if( substr($class, 0, 3) == 'WT:'){
-                                       $title_str = substr($class, 3);
-                                       $t = Title::newFromText( $title_str );
-                                       if( $t && $t->exists() ) {
-                                               if( $t->getLatestRevID() > $frev  )
-                                                       $frev = $t->getLatestRevID();
-                                       }
-                               }
-                       }
-                       //build the actual unique request id:
-                       $urid = "urid={$wgStyleVersion}";
-
-                       // Add the file modification time if set
-                       if( $ftime != 0 )
-                               $urid .= "_" . $ftime;
-
-                       //add the wiki rev id if set
-                       if( $frev != 0 )
-                               $urid.= "_" . $frev;
-
-                       return $urid;
+                       $path = "{$wgStylePath}/common/{$file}";
                }
-       }
-
-       /**
-        * Given a script path, get the JS class name, or false if no such path is registered.
-        * @param $path string
-        */
-       function getJsClassFromPath( $path ) {
-               global $wgJSAutoloadClasses, $wgJSAutoloadLocalClasses, $wgScriptPath;
-
-               $scriptLoaderPaths = array_merge( $wgJSAutoloadClasses,  $wgJSAutoloadLocalClasses );
-               foreach( $scriptLoaderPaths as $js_class => $js_path ) {
-                       $js_path = "{$wgScriptPath}/{$js_path}";
-                       if( $path == $js_path )
-                               return $js_class;
-               }
-               return false;
+               if ( is_null( $version ) )
+                       $version = $wgStyleVersion;
+               $this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );
        }
 
        /**
         * Add a self-contained script tag with the given contents
-        * @param string $script JavaScript text, no <script> tags
+        *
+        * @param $script String: JavaScript text, no <script> tags
         */
-       function addInlineScript( $script ) {
+       public function addInlineScript( $script ) {
                $this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";
        }
 
        /**
         * Get all registered JS and CSS tags for the header.
+        *
+        * @return String
         */
        function getScript() {
-               global $wgEnableScriptLoader;
-               if( $wgEnableScriptLoader ){
-                       return $this->mScripts . "\n" . $this->getScriptLoaderJs() . $this->getHeadItems();
-               } else {
-                       return $this->mScripts . $this->getHeadItems();
-               }
+               return $this->mScripts . $this->getHeadItems();
        }
 
+       /**
+        * Get all header items in a string
+        *
+        * @return String
+        */
        function getHeadItems() {
                $s = '';
                foreach ( $this->mHeadItems as $item ) {
@@ -357,34 +229,53 @@ class OutputPage {
                return $s;
        }
 
-       function addHeadItem( $name, $value ) {
+       /**
+        * Add or replace an header item to the output
+        *
+        * @param $name String: item name
+        * @param $value String: raw HTML
+        */
+       public function addHeadItem( $name, $value ) {
                $this->mHeadItems[$name] = $value;
        }
 
-       function hasHeadItem( $name ) {
+       /**
+        * Check if the header item $name is already set
+        *
+        * @param $name String: item name
+        * @return Boolean
+        */
+       public function hasHeadItem( $name ) {
                return isset( $this->mHeadItems[$name] );
        }
 
-       function setETag($tag) { $this->mETag = $tag; }
-       function setArticleBodyOnly($only) { $this->mArticleBodyOnly = $only; }
-       function getArticleBodyOnly() { return $this->mArticleBodyOnly; }
-
-       function addLink( $linkarr ) {
-               # $linkarr should be an associative array of attributes. We'll escape on output.
-               array_push( $this->mLinktags, $linkarr );
+       /**
+        * Set the value of the ETag HTTP header, only used if $wgUseETag is true
+        *
+        * @param $tag String: value of "ETag" header
+        */
+       function setETag( $tag ) {
+               $this->mETag = $tag;
        }
 
-       # Get all links added by extensions
-       function getExtStyle() {
-               return $this->mExtStyles;
+       /**
+        * Set whether the output should only contain the body of the article,
+        * without any skin, sidebar, etc.
+        * Used e.g. when calling with "action=render".
+        *
+        * @param $only Boolean: whether to output only the body of the article
+        */
+       public function setArticleBodyOnly( $only ) {
+               $this->mArticleBodyOnly = $only;
        }
 
-       function addMetadataLink( $linkarr ) {
-               # note: buggy CC software only reads first "meta" link
-               static $haveMeta = false;
-               $linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
-               $this->addLink( $linkarr );
-               $haveMeta = true;
+       /**
+        * Return whether the output will contain only the body of the article
+        *
+        * @return Boolean
+        */
+       public function getArticleBodyOnly() {
+               return $this->mArticleBodyOnly;
        }
 
        /**
@@ -394,9 +285,9 @@ class OutputPage {
         *
         * Side effect: sets mLastModified for Last-Modified header
         *
-        * @return bool True iff cache-ok headers was sent.
+        * @return Boolean: true iff cache-ok headers was sent.
         */
-       function checkLastModified( $timestamp ) {
+       public function checkLastModified( $timestamp ) {
                global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
 
                if ( !$timestamp || $timestamp == '19700101000000' ) {
@@ -463,7 +354,7 @@ class OutputPage {
                # Not modified
                # Give a 304 response code and disable body output
                wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
-               ini_set('zlib.output_compression', 0);
+               ini_set( 'zlib.output_compression', 0 );
                $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
                $this->sendCacheControl();
                $this->disable();
@@ -476,20 +367,20 @@ class OutputPage {
                return true;
        }
 
-       function setPageTitleActionText( $text ) {
-               $this->mPageTitleActionText = $text;
-       }
-
-       function getPageTitleActionText () {
-               if ( isset( $this->mPageTitleActionText ) ) {
-                       return $this->mPageTitleActionText;
-               }
+       /**
+        * Override the last modified timestamp
+        *
+        * @param $timestamp String: new timestamp, in a format readable by
+        *        wfTimestamp()
+        */
+       public function setLastModified( $timestamp ) {
+               $this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );
        }
 
        /**
         * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>
         *
-        * @param $policy string The literal string to output as the contents of
+        * @param $policy String: the literal string to output as the contents of
         *   the meta tag.  Will be parsed according to the spec and output in
         *   standardized form.
         * @return null
@@ -497,12 +388,12 @@ class OutputPage {
        public function setRobotPolicy( $policy ) {
                $policy = Article::formatRobotPolicy( $policy );
 
-               if( isset( $policy['index'] ) ){
+               if( isset( $policy['index'] ) ) {
                        $this->setIndexPolicy( $policy['index'] );
-               }
-               if( isset( $policy['follow'] ) ){
+               }
+               if( isset( $policy['follow'] ) ) {
                        $this->setFollowPolicy( $policy['follow'] );
-               }
+               }
        }
 
        /**
@@ -523,7 +414,7 @@ class OutputPage {
         * Set the follow policy for the page, but leave the index policy un-
         * touched.
         *
-        * @param $policy string Either 'follow' or 'nofollow'.
+        * @param $policy String: either 'follow' or 'nofollow'.
         * @return null
         */
        public function setFollowPolicy( $policy ) {
@@ -534,27 +425,56 @@ class OutputPage {
        }
 
        /**
-        * "HTML title" means the contents of <title>. It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
+        * Set the new value of the "action text", this will be added to the
+        * "HTML title", separated from it with " - ".
+        *
+        * @param $text String: new value of the "action text"
+        */
+       public function setPageTitleActionText( $text ) {
+               $this->mPageTitleActionText = $text;
+       }
+
+       /**
+        * Get the value of the "action text"
+        *
+        * @return String
+        */
+       public function getPageTitleActionText() {
+               if ( isset( $this->mPageTitleActionText ) ) {
+                       return $this->mPageTitleActionText;
+               }
+       }
+
+       /**
+        * "HTML title" means the contents of <title>.
+        * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.
         */
        public function setHTMLTitle( $name ) {
                $this->mHTMLtitle = $name;
        }
 
        /**
-        * "Page title" means the contents of <h1>. It is stored as a valid HTML fragment.
-        * This function allows good tags like <sup> in the <h1> tag, but not bad tags like <script>.
-        * This function automatically sets <title> to the same content as <h1> but with all tags removed.
-        * Bad tags that were escaped in <h1> will still be escaped in <title>, and good tags like <i> will be dropped entirely.
-         */
+        * Return the "HTML title", i.e. the content of the <title> tag.
+        *
+        * @return String
+        */
+       public function getHTMLTitle() {
+               return $this->mHTMLtitle;
+       }
+
+       /**
+        * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.
+        * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.
+        * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.
+        * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.
+        */
        public function setPageTitle( $name ) {
-               global $wgContLang;
-               $name = $wgContLang->convert( $name, true );
                # change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"
                # but leave "<i>foobar</i>" alone
                $nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );
                $this->mPagetitle = $nameWithTags;
 
-               $taction =  $this->getPageTitleActionText();
+               $taction = $this->getPageTitleActionText();
                if( !empty( $taction ) ) {
                        $name .= ' - '.$taction;
                }
@@ -563,44 +483,202 @@ class OutputPage {
                $this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );
        }
 
+       /**
+        * Return the "page title", i.e. the content of the \<h1\> tag.
+        *
+        * @return String
+        */
+       public function getPageTitle() {
+               return $this->mPagetitle;
+       }
+
+       /**
+        * Set the Title object to use
+        *
+        * @param $t Title object
+        */
        public function setTitle( $t ) {
                $this->mTitle = $t;
        }
 
+       /**
+        * Get the Title object used in this instance
+        *
+        * @return Title
+        */
        public function getTitle() {
                if ( $this->mTitle instanceof Title ) {
                        return $this->mTitle;
-               }
-               else {
+               } else {
                        wfDebug( __METHOD__ . ' called and $mTitle is null. Return $wgTitle for sanity' );
                        global $wgTitle;
                        return $wgTitle;
                }
        }
 
-       public function getHTMLTitle() { return $this->mHTMLtitle; }
-       public function getPageTitle() { return $this->mPagetitle; }
-       public function setSubtitle( $str ) { $this->mSubtitle = /*$this->parse(*/$str/*)*/; } // @bug 2514
-       public function appendSubtitle( $str ) { $this->mSubtitle .= /*$this->parse(*/$str/*)*/; } // @bug 2514
-       public function getSubtitle() { return $this->mSubtitle; }
-       public function isArticle() { return $this->mIsarticle; }
-       public function setPrintable() { $this->mPrintable = true; }
-       public function isPrintable() { return $this->mPrintable; }
-       public function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
-       public function isSyndicated() { return $this->mShowFeedLinks; }
-       public function setFeedAppendQuery( $val ) { $this->mFeedLinksAppendQuery = $val; }
-       public function getFeedAppendQuery() { return $this->mFeedLinksAppendQuery; }
-       public function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
-       public function getOnloadHandler() { return $this->mOnloadHandler; }
-       public function disable() { $this->mDoNothing = true; }
-       public function isDisabled() { return $this->mDoNothing; }
+       /**
+        * Replace the subtile with $str
+        *
+        * @param $str String: new value of the subtitle
+        */
+       public function setSubtitle( $str ) {
+               $this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514
+       }
 
-       public function setArticleRelated( $v ) {
-               $this->mIsArticleRelated = $v;
-               if ( !$v ) {
-                       $this->mIsarticle = false;
+       /**
+        * Add $str to the subtitle
+        *
+        * @param $str String to add to the subtitle
+        */
+       public function appendSubtitle( $str ) {
+               $this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514
+       }
+
+       /**
+        * Get the subtitle
+        *
+        * @return String
+        */
+       public function getSubtitle() {
+               return $this->mSubtitle;
+       }
+
+       /**
+        * Set the page as printable, i.e. it'll be displayed with with all
+        * print styles included
+        */
+       public function setPrintable() {
+               $this->mPrintable = true;
+       }
+
+       /**
+        * Return whether the page is "printable"
+        *
+        * @return Boolean
+        */
+       public function isPrintable() {
+               return $this->mPrintable;
+       }
+
+       /**
+        * Disable output completely, i.e. calling output() will have no effect
+        */
+       public function disable() {
+               $this->mDoNothing = true;
+       }
+
+       /**
+        * Return whether the output will be completely disabled
+        *
+        * @return Boolean
+        */
+       public function isDisabled() {
+               return $this->mDoNothing;
+       }
+
+       /**
+        * Show an "add new section" link?
+        *
+        * @return Boolean
+        */
+       public function showNewSectionLink() {
+               return $this->mNewSectionLink;
+       }
+
+       /**
+        * Forcibly hide the new section link?
+        *
+        * @return Boolean
+        */
+       public function forceHideNewSectionLink() {
+               return $this->mHideNewSectionLink;
+       }
+
+       /**
+        * Add or remove feed links in the page header
+        * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
+        * for the new version
+        * @see addFeedLink()
+        *
+        * @param $show Boolean: true: add default feeds, false: remove all feeds
+        */
+       public function setSyndicated( $show = true ) {
+               if ( $show ) {
+                       $this->setFeedAppendQuery( false );
+               } else {
+                       $this->mFeedLinks = array();
+               }
+       }
+
+       /**
+        * Add default feeds to the page header
+        * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()
+        * for the new version
+        * @see addFeedLink()
+        *
+        * @param $val String: query to append to feed links or false to output
+        *        default links
+        */
+       public function setFeedAppendQuery( $val ) {
+               global $wgAdvertisedFeedTypes;
+
+               $this->mFeedLinks = array();
+
+               foreach ( $wgAdvertisedFeedTypes as $type ) {
+                       $query = "feed=$type";
+                       if ( is_string( $val ) ) {
+                               $query .= '&' . $val;
+                       }
+                       $this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );
+               }
+       }
+
+       /**
+        * Add a feed link to the page header
+        *
+        * @param $format String: feed type, should be a key of $wgFeedClasses
+        * @param $href String: URL
+        */
+       public function addFeedLink( $format, $href ) {
+               global $wgAdvertisedFeedTypes;
+
+               if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {
+                       $this->mFeedLinks[$format] = $href;
                }
        }
+
+       /**
+        * Should we output feed links for this page?
+        * @return Boolean
+        */
+       public function isSyndicated() {
+               return count( $this->mFeedLinks ) > 0;
+       }
+
+       /**
+        * Return URLs for each supported syndication format for this page.
+        * @return array associating format keys with URLs
+        */
+       public function getSyndicationLinks() {
+               return $this->mFeedLinks;
+       }
+
+       /**
+        * Will currently always return null
+        *
+        * @return null
+        */
+       public function getFeedAppendQuery() {
+               return $this->mFeedLinksAppendQuery;
+       }
+
+       /**
+        * Set whether the displayed content is related to the source of the
+        * corresponding article on the wiki
+        * Setting true will cause the change "article related" toggle to true
+        *
+        * @param $v Boolean
+        */
        public function setArticleFlag( $v ) {
                $this->mIsarticle = $v;
                if ( $v ) {
@@ -608,22 +686,71 @@ class OutputPage {
                }
        }
 
-       public function isArticleRelated() { return $this->mIsArticleRelated; }
+       /**
+        * Return whether the content displayed page is related to the source of
+        * the corresponding article on the wiki
+        *
+        * @return Boolean
+        */
+       public function isArticle() {
+               return $this->mIsarticle;
+       }
 
-       public function getLanguageLinks() { return $this->mLanguageLinks; }
-       public function addLanguageLinks($newLinkArray) {
+       /**
+        * Set whether this page is related an article on the wiki
+        * Setting false will cause the change of "article flag" toggle to false
+        *
+        * @param $v Boolean
+        */
+       public function setArticleRelated( $v ) {
+               $this->mIsArticleRelated = $v;
+               if ( !$v ) {
+                       $this->mIsarticle = false;
+               }
+       }
+
+       /**
+        * Return whether this page is related an article on the wiki
+        *
+        * @return Boolean
+        */
+       public function isArticleRelated() {
+               return $this->mIsArticleRelated;
+       }
+
+       /**
+        * Add new language links
+        *
+        * @param $newLinkArray Associative array mapping language code to the page
+        *                      name
+        */
+       public function addLanguageLinks( $newLinkArray ) {
                $this->mLanguageLinks += $newLinkArray;
        }
-       public function setLanguageLinks($newLinkArray) {
+
+       /**
+        * Reset the language links and add new language links
+        *
+        * @param $newLinkArray Associative array mapping language code to the page
+        *                      name
+        */
+       public function setLanguageLinks( $newLinkArray ) {
                $this->mLanguageLinks = $newLinkArray;
        }
 
-       public function getCategoryLinks() {
-               return $this->mCategoryLinks;
+       /**
+        * Get the list of language links
+        *
+        * @return Associative array mapping language code to the page name
+        */
+       public function getLanguageLinks() {
+               return $this->mLanguageLinks;
        }
 
        /**
         * Add an array of categories, with names in the keys
+        *
+        * @param $categories Associative array mapping category name to its sort key
         */
        public function addCategoryLinks( $categories ) {
                global $wgUser, $wgContLang;
@@ -650,8 +777,10 @@ class OutputPage {
                $lb->addResultToCache( LinkCache::singleton(), $res );
 
                # Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+
-               $categories = array_combine( array_keys( $categories ),
-                       array_fill( 0, count( $categories ), 'normal' ) );
+               $categories = array_combine(
+                       array_keys( $categories ),
+                       array_fill( 0, count( $categories ), 'normal' )
+               );
 
                # Mark hidden categories
                foreach ( $res as $row ) {
@@ -667,38 +796,140 @@ class OutputPage {
                                $origcategory = $category;
                                $title = Title::makeTitleSafe( NS_CATEGORY, $category );
                                $wgContLang->findVariantLink( $category, $title, true );
-                               if ( $category != $origcategory )
-                                       if ( array_key_exists( $category, $categories ) )
+                               if ( $category != $origcategory ) {
+                                       if ( array_key_exists( $category, $categories ) ) {
                                                continue;
+                                       }
+                               }
                                $text = $wgContLang->convertHtml( $title->getText() );
+                               $this->mCategories[] = $title->getText();
                                $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
                        }
                }
        }
 
-       public function setCategoryLinks($categories) {
+       /**
+        * Reset the category links (but not the category list) and add $categories
+        *
+        * @param $categories Associative array mapping category name to its sort key
+        */
+       public function setCategoryLinks( $categories ) {
                $this->mCategoryLinks = array();
-               $this->addCategoryLinks($categories);
+               $this->addCategoryLinks( $categories );
+       }
+
+       /**
+        * Get the list of category links, in a 2-D array with the following format:
+        * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for
+        * hidden categories) and $link a HTML fragment with a link to the category
+        * page
+        *
+        * @return Array
+        */
+       public function getCategoryLinks() {
+               return $this->mCategoryLinks;
+       }
+
+       /**
+        * Get the list of category names this page belongs to
+        *
+        * @return Array of strings
+        */
+       public function getCategories() {
+               return $this->mCategories;
+       }
+
+       /**
+        * Suppress the quickbar from the output, only for skin supporting
+        * the quickbar
+        */
+       public function suppressQuickbar() {
+               $this->mSuppressQuickbar = true;
+       }
+
+       /**
+        * Return whether the quickbar should be suppressed from the output
+        *
+        * @return Boolean
+        */
+       public function isQuickbarSuppressed() {
+               return $this->mSuppressQuickbar;
+       }
+
+       /**
+        * Remove user JavaScript from scripts to load
+        */
+       public function disallowUserJs() {
+               $this->mAllowUserJs = false;
        }
 
-       public function suppressQuickbar() { $this->mSuppressQuickbar = true; }
-       public function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }
+       /**
+        * Return whether user JavaScript is allowed for this page
+        *
+        * @return Boolean
+        */
+       public function isUserJsAllowed() {
+               return $this->mAllowUserJs;
+       }
+
+       /**
+        * Prepend $text to the body HTML
+        *
+        * @param $text String: HTML
+        */
+       public function prependHTML( $text ) {
+               $this->mBodytext = $text . $this->mBodytext;
+       }
 
-       public function disallowUserJs() { $this->mAllowUserJs = false; }
-       public function isUserJsAllowed() { return $this->mAllowUserJs; }
+       /**
+        * Append $text to the body HTML
+        *
+        * @param $text String: HTML
+        */
+       public function addHTML( $text ) {
+               $this->mBodytext .= $text;
+       }
 
-       public function prependHTML( $text ) { $this->mBodytext = $text . $this->mBodytext; }
-       public function addHTML( $text ) { $this->mBodytext .= $text; }
-       public function clearHTML() { $this->mBodytext = ''; }
-       public function getHTML() { return $this->mBodytext; }
-       public function debug( $text ) { $this->mDebugtext .= $text; }
+       /**
+        * Clear the body HTML
+        */
+       public function clearHTML() {
+               $this->mBodytext = '';
+       }
 
-       /* @deprecated */
+       /**
+        * Get the body HTML
+        *
+        * @return String: HTML
+        */
+       public function getHTML() {
+               return $this->mBodytext;
+       }
+
+       /**
+        * Add $text to the debug output
+        *
+        * @param $text String: debug text
+        */
+       public function debug( $text ) {
+               $this->mDebugtext .= $text;
+       }
+
+       /**
+        * @deprecated use parserOptions() instead
+        */
        public function setParserOptions( $options ) {
                wfDeprecated( __METHOD__ );
                return $this->parserOptions( $options );
        }
 
+       /**
+        * Get/set the ParserOptions object to use for wikitext parsing
+        *
+        * @param $options either the ParserOption to use or null to only get the
+        *                 current ParserOption object
+        * @return current ParserOption object
+        */
        public function parserOptions( $options = null ) {
                if ( !$this->mParserOptions ) {
                        $this->mParserOptions = new ParserOptions;
@@ -709,40 +940,78 @@ class OutputPage {
        /**
         * Set the revision ID which will be seen by the wiki text parser
         * for things such as embedded {{REVISIONID}} variable use.
-        * @param mixed $revid an integer, or NULL
-        * @return mixed previous value
+        *
+        * @param $revid Mixed: an positive integer, or null
+        * @return Mixed: previous value
         */
        public function setRevisionId( $revid ) {
                $val = is_null( $revid ) ? null : intval( $revid );
                return wfSetVar( $this->mRevisionId, $val );
        }
 
+       /**
+        * Get the current revision ID
+        *
+        * @return Integer
+        */
        public function getRevisionId() {
                return $this->mRevisionId;
        }
 
        /**
         * Convert wikitext to HTML and add it to the buffer
-        * Default assumes that the current page title will
-        * be used.
+        * Default assumes that the current page title will be used.
         *
-        * @param string $text
-        * @param bool   $linestart
+        * @param $text String
+        * @param $linestart Boolean: is this the start of a line?
         */
        public function addWikiText( $text, $linestart = true ) {
                $title = $this->getTitle(); // Work arround E_STRICT
                $this->addWikiTextTitle( $text, $title, $linestart );
        }
 
-       public function addWikiTextWithTitle($text, &$title, $linestart = true) {
-               $this->addWikiTextTitle($text, $title, $linestart);
+       /**
+        * Add wikitext with a custom Title object
+        *
+        * @param $text String: wikitext
+        * @param $title Title object
+        * @param $linestart Boolean: is this the start of a line?
+        */
+       public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {
+               $this->addWikiTextTitle( $text, $title, $linestart );
        }
 
-       function addWikiTextTitleTidy($text, &$title, $linestart = true) {
+       /**
+        * Add wikitext with a custom Title object and
+        *
+        * @param $text String: wikitext
+        * @param $title Title object
+        * @param $linestart Boolean: is this the start of a line?
+        */
+       function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {
                $this->addWikiTextTitle( $text, $title, $linestart, true );
        }
 
-       public function addWikiTextTitle($text, &$title, $linestart, $tidy = false) {
+       /**
+        * Add wikitext with tidy enabled
+        *
+        * @param $text String: wikitext
+        * @param $linestart Boolean: is this the start of a line?
+        */
+       public function addWikiTextTidy( $text, $linestart = true ) {
+               $title = $this->getTitle();
+               $this->addWikiTextTitleTidy( $text, $title, $linestart );
+       }
+
+       /**
+        * Add wikitext with a custom Title object
+        *
+        * @param $text String: wikitext
+        * @param $title Title object
+        * @param $linestart Boolean: is this the start of a line?
+        * @param $tidy Boolean: whether to use tidy
+        */
+       public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {
                global $wgParser;
 
                wfProfileIn( __METHOD__ );
@@ -752,34 +1021,73 @@ class OutputPage {
                $popts = $this->parserOptions();
                $oldTidy = $popts->setTidy( $tidy );
 
-               $parserOutput = $wgParser->parse( $text, $title, $popts,
-                       $linestart, true, $this->mRevisionId );
+               $parserOutput = $wgParser->parse(
+                       $text, $title, $popts,
+                       $linestart, true, $this->mRevisionId
+               );
+
+               $popts->setTidy( $oldTidy );
+
+               $this->addParserOutput( $parserOutput );
+
+               wfProfileOut( __METHOD__ );
+       }
+
+       /**
+        * Add wikitext to the buffer, assuming that this is the primary text for a page view
+        * Saves the text into the parser cache if possible.
+        *
+        * @param $text String: wikitext
+        * @param $article Article object
+        * @param $cache Boolean
+        * @deprecated Use Article::outputWikitext
+        */
+       public function addPrimaryWikiText( $text, $article, $cache = true ) {
+               global $wgParser;
+
+               wfDeprecated( __METHOD__ );
 
-               $popts->setTidy( $oldTidy );
+               $popts = $this->parserOptions();
+               $popts->setTidy( true );
+               $parserOutput = $wgParser->parse(
+                       $text, $article->mTitle,
+                       $popts, true, true, $this->mRevisionId
+               );
+               $popts->setTidy( false );
+               if ( $cache && $article && !$parserOutput->isCacheable() ) {
+                       $parserCache = ParserCache::singleton();
+                       $parserCache->save( $parserOutput, $article, $popts );
+               }
 
                $this->addParserOutput( $parserOutput );
+       }
 
-               wfProfileOut( __METHOD__ );
+       /**
+        * @deprecated use addWikiTextTidy()
+        */
+       public function addSecondaryWikiText( $text, $linestart = true ) {
+               wfDeprecated( __METHOD__ );
+               $this->addWikiTextTitleTidy( $text, $this->getTitle(), $linestart );
        }
 
        /**
-        * @todo document
-        * @param ParserOutput object &$parserOutput
+        * Add a ParserOutput object, but without Html
+        *
+        * @param $parserOutput ParserOutput object
         */
        public function addParserOutputNoText( &$parserOutput ) {
-               global $wgExemptFromUserRobotsControl, $wgContentNamespaces;
-
                $this->mLanguageLinks += $parserOutput->getLanguageLinks();
                $this->addCategoryLinks( $parserOutput->getCategories() );
                $this->mNewSectionLink = $parserOutput->getNewSection();
                $this->mHideNewSectionLink = $parserOutput->getHideNewSection();
+               $this->mPageIcons = $parserOutput->getPageIcons();
 
                $this->mParseWarnings = $parserOutput->getWarnings();
-               if ( $parserOutput->getCacheTime() == -1 ) {
+               if ( !$parserOutput->isCacheable() ) {
                        $this->enableClientCache( false );
                }
                $this->mNoGallery = $parserOutput->getNoGallery();
-               $this->mHeadItems = array_merge( $this->mHeadItems, (array)$parserOutput->mHeadItems );
+               $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
                // Versioning...
                foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
                        if ( isset( $this->mTemplateIds[$ns] ) ) {
@@ -788,11 +1096,6 @@ class OutputPage {
                                $this->mTemplateIds[$ns] = $dbks;
                        }
                }
-               // Page title
-               if( ( $dt = $parserOutput->getDisplayTitle() ) !== false )
-                       $this->setPageTitle( $dt );
-               else if ( ( $title = $parserOutput->getTitleText() ) != '' )
-                       $this->setPageTitle( $title );
 
                // Hooks registered in the object
                global $wgParserOutputHooks;
@@ -807,64 +1110,22 @@ class OutputPage {
        }
 
        /**
-        * @todo document
-        * @param ParserOutput &$parserOutput
+        * Add a ParserOutput object
+        *
+        * @param $parserOutput ParserOutput
         */
        function addParserOutput( &$parserOutput ) {
                $this->addParserOutputNoText( $parserOutput );
                $text = $parserOutput->getText();
-               wfRunHooks( 'OutputPageBeforeHTML',array( &$this, &$text ) );
+               wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );
                $this->addHTML( $text );
        }
 
-       /**
-        * Add wikitext to the buffer, assuming that this is the primary text for a page view
-        * Saves the text into the parser cache if possible.
-        *
-        * @param string  $text
-        * @param Article $article
-        * @param bool    $cache
-        * @deprecated Use Article::outputWikitext
-        */
-       public function addPrimaryWikiText( $text, $article, $cache = true ) {
-               global $wgParser;
-
-               wfDeprecated( __METHOD__ );
-
-               $popts = $this->parserOptions();
-               $popts->setTidy(true);
-               $parserOutput = $wgParser->parse( $text, $article->mTitle,
-                       $popts, true, true, $this->mRevisionId );
-               $popts->setTidy(false);
-               if ( $cache && $article && $parserOutput->getCacheTime() != -1 ) {
-                       $parserCache = ParserCache::singleton();
-                       $parserCache->save( $parserOutput, $article, $popts);
-               }
-
-               $this->addParserOutput( $parserOutput );
-       }
-
-       /**
-        * @deprecated use addWikiTextTidy()
-        */
-       public function addSecondaryWikiText( $text, $linestart = true ) {
-               wfDeprecated( __METHOD__ );
-               $this->addWikiTextTitleTidy($text, $this->getTitle(), $linestart);
-       }
-
-       /**
-        * Add wikitext with tidy enabled
-        */
-       public function addWikiTextTidy(  $text, $linestart = true ) {
-               $title = $this->getTitle();
-               $this->addWikiTextTitleTidy($text, $title, $linestart);
-       }
-
 
        /**
         * Add the output of a QuickTemplate to the output buffer
         *
-        * @param QuickTemplate $template
+        * @param $template QuickTemplate
         */
        public function addTemplate( &$template ) {
                ob_start();
@@ -876,9 +1137,12 @@ class OutputPage {
        /**
         * Parse wikitext and return the HTML.
         *
-        * @param string $text
-        * @param bool   $linestart Is this the start of a line?
-        * @param bool   $interface ??
+        * @param $text String
+        * @param $linestart Boolean: is this the start of a line?
+        * @param $interface Boolean: use interface language ($wgLang instead of
+        *                   $wgContLang) while parsing language sensitive magic
+        *                   words like GRAMMAR and PLURAL
+        * @return String: HTML
         */
        public function parse( $text, $linestart = true, $interface = false ) {
                global $wgParser;
@@ -886,14 +1150,29 @@ class OutputPage {
                        throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
                }
                $popts = $this->parserOptions();
-               if ( $interface) { $popts->setInterfaceMessage(true); }
-               $parserOutput = $wgParser->parse( $text, $this->getTitle(), $popts,
-                       $linestart, true, $this->mRevisionId );
-               if ( $interface) { $popts->setInterfaceMessage(false); }
+               if ( $interface ) {
+                       $popts->setInterfaceMessage( true );
+               }
+               $parserOutput = $wgParser->parse(
+                       $text, $this->getTitle(), $popts,
+                       $linestart, true, $this->mRevisionId
+               );
+               if ( $interface ) {
+                       $popts->setInterfaceMessage( false );
+               }
                return $parserOutput->getText();
        }
 
-       /** Parse wikitext, strip paragraphs, and return the HTML. */
+       /**
+        * Parse wikitext, strip paragraphs, and return the HTML.
+        *
+        * @param $text String
+        * @param $linestart Boolean: is this the start of a line?
+        * @param $interface Boolean: use interface language ($wgLang instead of
+        *                   $wgContLang) while parsing language sensitive magic
+        *                   words like GRAMMAR and PLURAL
+        * @return String: HTML
+        */
        public function parseInline( $text, $linestart = true, $interface = false ) {
                $parsed = $this->parse( $text, $linestart, $interface );
 
@@ -906,18 +1185,16 @@ class OutputPage {
        }
 
        /**
-        * @param Article $article
-        * @param User    $user
-        *
         * @deprecated
         *
-        * @return bool True if successful, else false.
+        * @param $article Article
+        * @return Boolean: true if successful, else false.
         */
        public function tryParserCache( &$article ) {
                wfDeprecated( __METHOD__ );
                $parserOutput = ParserCache::singleton()->get( $article, $article->getParserOptions() );
 
-               if ($parserOutput !== false) {
+               if ( $parserOutput !== false ) {
                        $this->addParserOutput( $parserOutput );
                        return true;
                } else {
@@ -926,7 +1203,9 @@ class OutputPage {
        }
 
        /**
-        * @param int $maxage Maximum cache time on the Squid, in seconds.
+        * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
+        *
+        * @param $maxage Integer: maximum cache time on the Squid, in seconds.
         */
        public function setSquidMaxage( $maxage ) {
                $this->mSquidMaxage = $maxage;
@@ -934,12 +1213,18 @@ class OutputPage {
 
        /**
         * Use enableClientCache(false) to force it to send nocache headers
+        *
         * @param $state ??
         */
        public function enableClientCache( $state ) {
                return wfSetVar( $this->mEnableClientCache, $state );
        }
 
+       /**
+        * Get the list of cookies that will influence on the cache
+        *
+        * @return Array
+        */
        function getCacheVaryCookies() {
                global $wgCookiePrefix, $wgCacheVaryCookies;
                static $cookies;
@@ -952,20 +1237,28 @@ class OutputPage {
                                ),
                                $wgCacheVaryCookies
                        );
-                       wfRunHooks('GetCacheVaryCookies', array( $this, &$cookies ) );
+                       wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );
                }
                return $cookies;
        }
 
+       /**
+        * Return whether this page is not cacheable because "useskin" or "uselang"
+        * URL parameters were passed.
+        *
+        * @return Boolean
+        */
        function uncacheableBecauseRequestVars() {
                global $wgRequest;
-               return  $wgRequest->getText('useskin', false) === false
-                       && $wgRequest->getText('uselang', false) === false;
+               return $wgRequest->getText( 'useskin', false ) === false
+                       && $wgRequest->getText( 'uselang', false ) === false;
        }
 
        /**
         * Check if the request has a cache-varying cookie header
         * If it does, it's very important that we don't allow public caching
+        *
+        * @return Boolean
         */
        function haveCacheVaryCookies() {
                global $wgRequest;
@@ -977,40 +1270,100 @@ class OutputPage {
                foreach ( $cvCookies as $cookieName ) {
                        # Check for a simple string match, like the way squid does it
                        if ( strpos( $cookieHeader, $cookieName ) ) {
-                               wfDebug( __METHOD__.": found $cookieName\n" );
+                               wfDebug( __METHOD__ . ": found $cookieName\n" );
                                return true;
                        }
                }
-               wfDebug( __METHOD__.": no cache-varying cookies found\n" );
+               wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );
                return false;
        }
 
-       /** Get a complete X-Vary-Options header */
+       /**
+        * Add an HTTP header that will influence on the cache
+        *
+        * @param $header String: header name
+        * @param $option either an Array or null
+        */
+       public function addVaryHeader( $header, $option = null ) {
+               if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
+                       $this->mVaryHeader[$header] = $option;
+               } elseif( is_array( $option ) ) {
+                       if( is_array( $this->mVaryHeader[$header] ) ) {
+                               $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
+                       } else {
+                               $this->mVaryHeader[$header] = $option;
+                       }
+               }
+               $this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );
+       }
+
+       /**
+        * Get a complete X-Vary-Options header
+        *
+        * @return String
+        */
        public function getXVO() {
                $cvCookies = $this->getCacheVaryCookies();
-               $xvo = 'X-Vary-Options: Accept-Encoding;list-contains=gzip,Cookie;';
-               $first = true;
+
+               $cookiesOption = array();
                foreach ( $cvCookies as $cookieName ) {
-                       if ( $first ) {
-                               $first = false;
-                       } else {
-                               $xvo .= ';';
+                       $cookiesOption[] = 'string-contains=' . $cookieName;
+               }
+               $this->addVaryHeader( 'Cookie', $cookiesOption );
+
+               $headers = array();
+               foreach( $this->mVaryHeader as $header => $option ) {
+                       $newheader = $header;
+                       if( is_array( $option ) ) {
+                               $newheader .= ';' . implode( ';', $option );
                        }
-                       $xvo .= 'string-contains=' . $cookieName;
+                       $headers[] = $newheader;
                }
+               $xvo = 'X-Vary-Options: ' . implode( ',', $headers );
+
                return $xvo;
        }
 
+       /**
+        * bug 21672: Add Accept-Language to Vary and XVO headers
+        * if there's no 'variant' parameter existed in GET.
+        *
+        * For example:
+        *   /w/index.php?title=Main_page should always be served; but
+        *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
+        */
+       function addAcceptLanguage() {
+               global $wgRequest, $wgContLang;
+               if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
+                       $variants = $wgContLang->getVariants();
+                       $aloption = array();
+                       foreach ( $variants as $variant ) {
+                               if( $variant === $wgContLang->getCode() ) {
+                                       continue;
+                               } else {
+                                       $aloption[] = "string-contains=$variant";
+                               }
+                       }
+                       $this->addVaryHeader( 'Accept-Language', $aloption );
+               }
+       }
+
+       /**
+        * Send cache control HTTP headers
+        */
        public function sendCacheControl() {
                global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
 
                $response = $wgRequest->response();
-               if ($wgUseETag && $this->mETag)
-                       $response->header("ETag: $this->mETag");
+               if ( $wgUseETag && $this->mETag ) {
+                       $response->header( "ETag: $this->mETag" );
+               }
+
+               $this->addAcceptLanguage();
 
                # don't serve compressed data to clients who can't handle it
                # maintain different caches for logged-in users and non-logged in ones
-               $response->header( 'Vary: Accept-Encoding, Cookie' );
+               $response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );
 
                if ( $wgUseXVO ) {
                        # Add an X-Vary-Options header for Squid with Wikimedia patches
@@ -1018,8 +1371,10 @@ class OutputPage {
                }
 
                if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {
-                       if( $wgUseSquid && session_id() == '' &&
-                         ! $this->isPrintable() && $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies() )
+                       if(
+                               $wgUseSquid && session_id() == '' && !$this->isPrintable() &&
+                               $this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()
+                       )
                        {
                                if ( $wgUseESI ) {
                                        # We'll purge the proxy cache explicitly, but require end user agents
@@ -1061,6 +1416,65 @@ class OutputPage {
                }
        }
 
+       /**
+        * Get the message associed with the HTTP response code $code
+        *
+        * @param $code Integer: status code
+        * @return String or null: message or null if $code is not in the list of
+        *         messages
+        */
+       public static function getStatusMessage( $code ) {
+               static $statusMessage = array(
+                       100 => 'Continue',
+                       101 => 'Switching Protocols',
+                       102 => 'Processing',
+                       200 => 'OK',
+                       201 => 'Created',
+                       202 => 'Accepted',
+                       203 => 'Non-Authoritative Information',
+                       204 => 'No Content',
+                       205 => 'Reset Content',
+                       206 => 'Partial Content',
+                       207 => 'Multi-Status',
+                       300 => 'Multiple Choices',
+                       301 => 'Moved Permanently',
+                       302 => 'Found',
+                       303 => 'See Other',
+                       304 => 'Not Modified',
+                       305 => 'Use Proxy',
+                       307 => 'Temporary Redirect',
+                       400 => 'Bad Request',
+                       401 => 'Unauthorized',
+                       402 => 'Payment Required',
+                       403 => 'Forbidden',
+                       404 => 'Not Found',
+                       405 => 'Method Not Allowed',
+                       406 => 'Not Acceptable',
+                       407 => 'Proxy Authentication Required',
+                       408 => 'Request Timeout',
+                       409 => 'Conflict',
+                       410 => 'Gone',
+                       411 => 'Length Required',
+                       412 => 'Precondition Failed',
+                       413 => 'Request Entity Too Large',
+                       414 => 'Request-URI Too Large',
+                       415 => 'Unsupported Media Type',
+                       416 => 'Request Range Not Satisfiable',
+                       417 => 'Expectation Failed',
+                       422 => 'Unprocessable Entity',
+                       423 => 'Locked',
+                       424 => 'Failed Dependency',
+                       500 => 'Internal Server Error',
+                       501 => 'Not Implemented',
+                       502 => 'Bad Gateway',
+                       503 => 'Service Unavailable',
+                       504 => 'Gateway Timeout',
+                       505 => 'HTTP Version Not Supported',
+                       507 => 'Insufficient Storage'
+               );
+               return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
+       }
+
        /**
         * Finally, all the text has been munged and accumulated into
         * the object, let's actually output it:
@@ -1070,105 +1484,55 @@ class OutputPage {
                global $wgContLanguageCode, $wgDebugRedirects, $wgMimeType;
                global $wgUseAjax, $wgAjaxWatch;
                global $wgEnableMWSuggest, $wgUniversalEditButton;
-               global $wgArticle;
+               global $wgArticle, $wgJQueryOnEveryPage;
 
-               if( $this->mDoNothing ){
+               if( $this->mDoNothing ) {
                        return;
                }
                wfProfileIn( __METHOD__ );
-               if ( '' != $this->mRedirect ) {
+               if ( $this->mRedirect != '' ) {
                        # Standards require redirect URLs to be absolute
                        $this->mRedirect = wfExpandUrl( $this->mRedirect );
-                       if( $this->mRedirectCode == '301') {
+                       if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
                                if( !$wgDebugRedirects ) {
-                                       $wgRequest->response()->header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
+                                       $message = self::getStatusMessage( $this->mRedirectCode );
+                                       $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
                                }
                                $this->mLastModified = wfTimestamp( TS_RFC2822 );
                        }
                        $this->sendCacheControl();
 
-                       $wgRequest->response()->header("Content-Type: text/html; charset=utf-8");
+                       $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
                        if( $wgDebugRedirects ) {
                                $url = htmlspecialchars( $this->mRedirect );
                                print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
                                print "<p>Location: <a href=\"$url\">$url</a></p>\n";
                                print "</body>\n</html>\n";
                        } else {
-                               $wgRequest->response()->header( 'Location: '.$this->mRedirect );
+                               $wgRequest->response()->header( 'Location: ' . $this->mRedirect );
                        }
                        wfProfileOut( __METHOD__ );
                        return;
-               }
-               elseif ( $this->mStatusCode )
-               {
-                       $statusMessage = array(
-                               100 => 'Continue',
-                               101 => 'Switching Protocols',
-                               102 => 'Processing',
-                               200 => 'OK',
-                               201 => 'Created',
-                               202 => 'Accepted',
-                               203 => 'Non-Authoritative Information',
-                               204 => 'No Content',
-                               205 => 'Reset Content',
-                               206 => 'Partial Content',
-                               207 => 'Multi-Status',
-                               300 => 'Multiple Choices',
-                               301 => 'Moved Permanently',
-                               302 => 'Found',
-                               303 => 'See Other',
-                               304 => 'Not Modified',
-                               305 => 'Use Proxy',
-                               307 => 'Temporary Redirect',
-                               400 => 'Bad Request',
-                               401 => 'Unauthorized',
-                               402 => 'Payment Required',
-                               403 => 'Forbidden',
-                               404 => 'Not Found',
-                               405 => 'Method Not Allowed',
-                               406 => 'Not Acceptable',
-                               407 => 'Proxy Authentication Required',
-                               408 => 'Request Timeout',
-                               409 => 'Conflict',
-                               410 => 'Gone',
-                               411 => 'Length Required',
-                               412 => 'Precondition Failed',
-                               413 => 'Request Entity Too Large',
-                               414 => 'Request-URI Too Large',
-                               415 => 'Unsupported Media Type',
-                               416 => 'Request Range Not Satisfiable',
-                               417 => 'Expectation Failed',
-                               422 => 'Unprocessable Entity',
-                               423 => 'Locked',
-                               424 => 'Failed Dependency',
-                               500 => 'Internal Server Error',
-                               501 => 'Not Implemented',
-                               502 => 'Bad Gateway',
-                               503 => 'Service Unavailable',
-                               504 => 'Gateway Timeout',
-                               505 => 'HTTP Version Not Supported',
-                               507 => 'Insufficient Storage'
-                       );
-
-                       if ( $statusMessage[$this->mStatusCode] )
-                               $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $statusMessage[$this->mStatusCode] );
+               } elseif ( $this->mStatusCode ) {
+                       $message = self::getStatusMessage( $this->mStatusCode );
+                       if ( $message ) {
+                               $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
+                       }
                }
 
                $sk = $wgUser->getSkin();
 
-               // Add our core scripts to output
-               $this->addCoreScripts2Top();
-
                if ( $wgUseAjax ) {
                        $this->addScriptFile( 'ajax.js' );
 
                        wfRunHooks( 'AjaxAddScript', array( &$this ) );
 
                        if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
+                               $this->includeJQuery();
                                $this->addScriptFile( 'ajaxwatch.js' );
                        }
 
-                       if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ){
+                       if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
                                $this->addScriptFile( 'mwsuggest.js' );
                        }
                }
@@ -1177,22 +1541,11 @@ class OutputPage {
                        $this->addScriptFile( 'rightclickedit.js' );
                }
 
-               global $wgUseAJAXCategories, $wgEnableJS2system;
-               if ($wgUseAJAXCategories && $wgEnableJS2system) {
-                       global $wgAJAXCategoriesNamespaces;
-
-                       $title = $this->getTitle();
-
-                       if( empty( $wgAJAXCategoriesNamespaces ) || in_array( $title->getNamespace(), $wgAJAXCategoriesNamespaces ) ) {
-                               $this->addScriptClass( 'ajaxCategories' );
-                       }
-               }
-
                if( $wgUniversalEditButton ) {
                        if( isset( $wgArticle ) && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
                                && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
                                // Original UniversalEditButton
-                               $msg = wfMsg('edit');
+                               $msg = wfMsg( 'edit' );
                                $this->addLink( array(
                                        'rel' => 'alternate',
                                        'type' => 'application/x-wiki',
@@ -1208,14 +1561,18 @@ class OutputPage {
                        }
                }
 
+               if ( $wgJQueryOnEveryPage ) {
+                       $this->includeJQuery();
+               }
+
                # Buffer output; final headers may depend on later processing
                ob_start();
 
                $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
-               $wgRequest->response()->header( 'Content-language: '.$wgContLanguageCode );
+               $wgRequest->response()->header( 'Content-language: ' . $wgContLanguageCode );
 
-               if ($this->mArticleBodyOnly) {
-                       $this->out($this->mBodytext);
+               if ( $this->mArticleBodyOnly ) {
+                       $this->out( $this->mBodytext );
                } else {
                        // Hook that allows last minute changes to the output page, e.g.
                        // adding of CSS or Javascript by extensions.
@@ -1234,7 +1591,8 @@ class OutputPage {
        /**
         * Actually output something with print(). Performs an iconv to the
         * output encoding, if needed.
-        * @param string $ins The string to output
+        *
+        * @param $ins String: the string to output
         */
        public function out( $ins ) {
                global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
@@ -1242,7 +1600,9 @@ class OutputPage {
                        $outs = $ins;
                } else {
                        $outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
-                       if ( false === $outs ) { $outs = $ins; }
+                       if ( false === $outs ) {
+                               $outs = $ins;
+                       }
                }
                print $outs;
        }
@@ -1252,7 +1612,6 @@ class OutputPage {
         */
        public static function setEncodings() {
                global $wgInputEncoding, $wgOutputEncoding;
-               global $wgContLang;
 
                $wgInputEncoding = strtolower( $wgInputEncoding );
 
@@ -1264,9 +1623,9 @@ class OutputPage {
        }
 
        /**
-        * Deprecated, use wfReportTime() instead.
-        * @return string
-        * @deprecated
+        * @deprecated use wfReportTime() instead.
+        *
+        * @return String
         */
        public function reportTime() {
                wfDeprecated( __METHOD__ );
@@ -1277,7 +1636,7 @@ class OutputPage {
        /**
         * Produce a "user is blocked" page.
         *
-        * @param bool $return Whether to have a "return to $wgTitle" message or not.
+        * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
         * @return nothing
         */
        function blockedPage( $return = true ) {
@@ -1292,7 +1651,9 @@ class OutputPage {
                if( $reason == '' ) {
                        $reason = wfMsg( 'blockednoreason' );
                }
-               $blockTimestamp = $wgLang->timeanddate( wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true );
+               $blockTimestamp = $wgLang->timeanddate(
+                       wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true
+               );
                $ip = wfGetIP();
 
                $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
@@ -1305,16 +1666,20 @@ class OutputPage {
                        // Search for localization in 'ipboptions'
                        $scBlockExpiryOptions = wfMsg( 'ipboptions' );
                        foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
-                               if ( strpos( $option, ":" ) === false )
+                               if ( strpos( $option, ':' ) === false ) {
                                        continue;
-                               list( $show, $value ) = explode( ":", $option );
+                               }
+                               list( $show, $value ) = explode( ':', $option );
                                if ( $value == 'infinite' || $value == 'indefinite' ) {
                                        $blockExpiry = $show;
                                        break;
                                }
                        }
                } else {
-                       $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
+                       $blockExpiry = $wgLang->timeanddate(
+                               wfTimestamp( TS_MW, $blockExpiry ),
+                               true
+                       );
                }
 
                if ( $wgUser->mBlock->mAuto ) {
@@ -1324,10 +1689,13 @@ class OutputPage {
                }
 
                /* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.
-                * This could be a username, an ip range, or a single ip. */
+                * This could be a username, an IP range, or a single IP. */
                $intended = $wgUser->mBlock->mAddress;
 
-               $this->addWikiMsg( $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended, $blockTimestamp );
+               $this->addWikiMsg(
+                       $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,
+                       $intended, $blockTimestamp
+               );
 
                # Don't auto-return to special pages
                if( $return ) {
@@ -1339,9 +1707,9 @@ class OutputPage {
        /**
         * Output a standard error page
         *
-        * @param string $title Message key for page title
-        * @param string $msg Message key for page text
-        * @param array $params Message parameters
+        * @param $title String: message key for page title
+        * @param $msg String: message key for page text
+        * @param $params Array: message parameters
         */
        public function showErrorPage( $title, $msg, $params = array() ) {
                if ( $this->getTitle() ) {
@@ -1365,10 +1733,10 @@ class OutputPage {
        /**
         * Output a standard permission error page
         *
-        * @param array $errors Error message keys
+        * @param $errors Array: error message keys
+        * @param $action String: action that was denied or null if unknown
         */
-       public function showPermissionsErrorPage( $errors, $action = null )
-       {
+       public function showPermissionsErrorPage( $errors, $action = null ) {
                $this->mDebugtext .= 'Original title: ' .
                $this->getTitle()->getPrefixedText() . "\n";
                $this->setPageTitle( wfMsg( 'permissionserrors' ) );
@@ -1381,17 +1749,11 @@ class OutputPage {
                $this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );
        }
 
-       /** @deprecated */
-       public function errorpage( $title, $msg ) {
-               wfDeprecated( __METHOD__ );
-               throw new ErrorPageError( $title, $msg );
-       }
-
        /**
         * Display an error page indicating that a given version of MediaWiki is
         * required to use it
         *
-        * @param mixed $version The version of MediaWiki needed to use the page
+        * @param $version Mixed: the version of MediaWiki needed to use the page
         */
        public function versionRequired( $version ) {
                $this->setPageTitle( wfMsg( 'versionrequired', $version ) );
@@ -1407,7 +1769,7 @@ class OutputPage {
        /**
         * Display an error page noting that a given permission bit is required.
         *
-        * @param string $permission key required
+        * @param $permission String: key required
         */
        public function permissionRequired( $permission ) {
                global $wgLang;
@@ -1421,9 +1783,11 @@ class OutputPage {
                $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
                        User::getGroupsWithPermission( $permission ) );
                if( $groups ) {
-                       $this->addWikiMsg( 'badaccess-groups',
+                       $this->addWikiMsg(
+                               'badaccess-groups',
                                $wgLang->commaList( $groups ),
-                               count( $groups) );
+                               count( $groups )
+                       );
                } else {
                        $this->addWikiMsg( 'badaccess-group0' );
                }
@@ -1431,16 +1795,14 @@ class OutputPage {
        }
 
        /**
-        * Use permissionRequired.
-        * @deprecated
+        * @deprecated use permissionRequired()
         */
        public function sysopRequired() {
                throw new MWException( "Call to deprecated OutputPage::sysopRequired() method\n" );
        }
 
        /**
-        * Use permissionRequired.
-        * @deprecated
+        * @deprecated use permissionRequired()
         */
        public function developerRequired() {
                throw new MWException( "Call to deprecated OutputPage::developerRequired() method\n" );
@@ -1450,7 +1812,7 @@ class OutputPage {
         * Produce the stock "please login to use the wiki" page
         */
        public function loginToUse() {
-               global $wgUser, $wgContLang;
+               global $wgUser;
 
                if( $wgUser->isLoggedIn() ) {
                        $this->permissionRequired( 'read' );
@@ -1473,45 +1835,49 @@ class OutputPage {
                        array( 'known', 'noclasses' )
                );
                $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
-               $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . "-->" );
+               $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
 
                # Don't return to the main page if the user can't read it
                # otherwise we'll end up in a pointless loop
                $mainPage = Title::newMainPage();
-               if( $mainPage->userCanRead() )
+               if( $mainPage->userCanRead() ) {
                        $this->returnToMain( null, $mainPage );
-       }
-
-       /** @deprecated */
-       public function databaseError( $fname, $sql, $error, $errno ) {
-               throw new MWException( "OutputPage::databaseError is obsolete\n" );
+               }
        }
 
        /**
-        * @param array $errors An array of arrays returned by Title::getUserPermissionsErrors
-        * @return string The wikitext error-messages, formatted into a list.
+        * Format a list of error messages
+        *
+        * @param $errors An array of arrays returned by Title::getUserPermissionsErrors
+        * @param $action String: action that was denied or null if unknown
+        * @return String: the wikitext error-messages, formatted into a list.
         */
        public function formatPermissionsErrorMessage( $errors, $action = null ) {
-               if ($action == null) {
-                       $text = wfMsgNoTrans( 'permissionserrorstext', count($errors)). "\n\n";
+               if ( $action == null ) {
+                       $text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";
                } else {
                        global $wgLang;
                        $action_desc = wfMsgNoTrans( "action-$action" );
-                       $text = wfMsgNoTrans( 'permissionserrorstext-withaction', count($errors), $action_desc ) . "\n\n";
+                       $text = wfMsgNoTrans(
+                               'permissionserrorstext-withaction',
+                               count( $errors ),
+                               $action_desc
+                       ) . "\n\n";
                }
 
-               if (count( $errors ) > 1) {
+               if ( count( $errors ) > 1 ) {
                        $text .= '<ul class="permissions-errors">' . "\n";
 
-                       foreach( $errors as $error )
-                       {
+                       foreach( $errors as $error ) {
                                $text .= '<li>';
                                $text .= call_user_func_array( 'wfMsgNoTrans', $error );
                                $text .= "</li>\n";
                        }
                        $text .= '</ul>';
                } else {
-                       $text .= "<div class=\"permissions-errors\">\n" . call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) . "\n</div>";
+                       $text .= "<div class=\"permissions-errors\">\n" .
+                                       call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .
+                                       "\n</div>";
                }
 
                return $text;
@@ -1532,9 +1898,10 @@ class OutputPage {
         *
         * @todo Needs to be split into multiple functions.
         *
-        * @param string $source    Source code to show (or null).
-        * @param bool   $protected Is this a permissions error?
-        * @param array  $reasons   List of reasons for this error, as returned by Title::getUserPermissionsErrors().
+        * @param $source    String: source code to show (or null).
+        * @param $protected Boolean: is this a permissions error?
+        * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().
+        * @param $action    String: action that was denied or null if unknown
         */
        public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
                global $wgUser;
@@ -1545,11 +1912,11 @@ class OutputPage {
 
                // If no reason is given, just supply a default "I can't let you do
                // that, Dave" message.  Should only occur if called by legacy code.
-               if ( $protected && empty($reasons) ) {
+               if ( $protected && empty( $reasons ) ) {
                        $reasons[] = array( 'badaccess-group0' );
                }
 
-               if ( !empty($reasons) ) {
+               if ( !empty( $reasons ) ) {
                        // Permissions error
                        if( $source ) {
                                $this->setPageTitle( wfMsg( 'viewsource' ) );
@@ -1573,7 +1940,7 @@ class OutputPage {
                        // Wiki is read only
                        $this->setPageTitle( wfMsg( 'readonly' ) );
                        $reason = wfReadOnlyReason();
-                       $this->wrapWikiMsg( '<div class="mw-readonly-error">$1</div>', array( 'readonlytext', $reason ) );
+                       $this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );
                }
 
                // Show source, if supplied
@@ -1606,6 +1973,17 @@ class OutputPage {
                }
        }
 
+       /** @deprecated */
+       public function errorpage( $title, $msg ) {
+               wfDeprecated( __METHOD__ );
+               throw new ErrorPageError( $title, $msg );
+       }
+
+       /** @deprecated */
+       public function databaseError( $fname, $sql, $error, $errno ) {
+               throw new MWException( "OutputPage::databaseError is obsolete\n" );
+       }
+
        /** @deprecated */
        public function fatalError( $message ) {
                wfDeprecated( __METHOD__ );
@@ -1643,8 +2021,8 @@ class OutputPage {
        }
 
        public function showFatalError( $message ) {
-               $this->setPageTitle( wfMsg( "internalerror" ) );
-               $this->setRobotPolicy( "noindex,nofollow" );
+               $this->setPageTitle( wfMsg( 'internalerror' ) );
+               $this->setRobotPolicy( 'noindex,nofollow' );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );
                $this->mRedirect = '';
@@ -1674,14 +2052,17 @@ class OutputPage {
        /**
         * Add a "return to" link pointing to a specified title
         *
-        * @param Title $title Title to link
-        * @param string $query Query string
+        * @param $title Title to link
+        * @param $query String: query string
+        * @param $text String text of the link (input is not escaped)
         */
-       public function addReturnTo( $title, $query = array() ) {
+       public function addReturnTo( $title, $query = array(), $text = null ) {
                global $wgUser;
-               $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullUrl() ) );
-               $link = wfMsgHtml( 'returnto', $wgUser->getSkin()->link(
-                       $title, null, array(), $query ) );
+               $this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );
+               $link = wfMsgHtml(
+                       'returnto',
+                       $wgUser->getSkin()->link( $title, $text, array(), $query )
+               );
                $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
        }
 
@@ -1689,8 +2070,9 @@ class OutputPage {
         * Add a "return to" link pointing to a specified title,
         * or the title indicated in the request, or else the main page
         *
-        * @param null $unused No longer used
-        * @param Title $returnto Title to return to
+        * @param $unused No longer used
+        * @param $returnto Title or String to return to
+        * @param $returntoquery String: query string for the return to link
         */
        public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
                global $wgRequest;
@@ -1703,7 +2085,7 @@ class OutputPage {
                        $returntoquery = $wgRequest->getText( 'returntoquery' );
                }
 
-               if ( '' === $returnto ) {
+               if ( $returnto === '' ) {
                        $returnto = Title::newMainPage();
                }
 
@@ -1720,90 +2102,154 @@ class OutputPage {
        }
 
        /**
-        * @return string The doctype, opening <html>, and head element.
-        *
         * @param $sk Skin The given Skin
+        * @param $includeStyle Boolean: unused
+        * @return String: The doctype, opening <html>, and head element.
         */
-       public function headElement( Skin $sk , $includeStyle = true ) {
-               global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
-               global $wgXhtmlDefaultNamespace, $wgXhtmlNamespaces;
-               global $wgContLang, $wgUseTrackbacks, $wgStyleVersion, $wgEnableScriptLoader, $wgHtml5;
+       public function headElement( Skin $sk, $includeStyle = true ) {
+               global $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
+               global $wgContLang, $wgUseTrackbacks, $wgStyleVersion, $wgHtml5;
+               global $wgUser, $wgRequest, $wgLang;
 
-               $this->addMeta( "http:Content-Type", "$wgMimeType; charset={$wgOutputEncoding}" );
                if ( $sk->commonPrintStylesheet() ) {
                        $this->addStyle( 'common/wikiprintable.css', 'print' );
                }
                $sk->setupUserCss( $this );
 
-               $ret = '';
+               $dir = $wgContLang->getDir();
+               $htmlAttribs = array( 'lang' => $wgContLanguageCode, 'dir' => $dir );
+               $ret = Html::htmlHeader( $htmlAttribs );
 
-               if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
-                       $ret .= "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
+               if ( $this->getHTMLTitle() == '' ) {
+                       $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
                }
 
-               if ( '' == $this->getHTMLTitle() ) {
-                       $this->setHTMLTitle(  wfMsg( 'pagetitle', $this->getPageTitle() ));
+               $openHead = Html::openElement( 'head' );
+               if ( $openHead ) {
+                       # Don't bother with the newline if $head == ''
+                       $ret .= "$openHead\n";
                }
 
-               $dir = $wgContLang->getDir();
-
                if ( $wgHtml5 ) {
-                       $ret .= "<!doctype html>\n";
-                       $ret .= "<html lang=\"$wgContLanguageCode\" dir=\"$dir\">\n";
+                       # More succinct than <meta http-equiv=Content-Type>, has the
+                       # same effect
+                       $ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";
                } else {
-                       $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\" \"$wgDTD\">\n";
-                       $ret .= "<html xmlns=\"{$wgXhtmlDefaultNamespace}\" ";
-                       foreach($wgXhtmlNamespaces as $tag => $ns) {
-                               $ret .= "xmlns:{$tag}=\"{$ns}\" ";
-                       }
-                       $ret .= "xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" dir=\"$dir\">\n";
+                       $this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );
                }
 
-               $ret .= "<head>\n";
-               $ret .= "<title>" . htmlspecialchars( $this->getHTMLTitle() ) . "</title>\n";
+               $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
+
                $ret .= implode( "\n", array(
                        $this->getHeadLinks(),
                        $this->buildCssLinks(),
-                       $this->getHeadScripts(),
-                       $this->getHeadItems(),
-               ));
-               if( $sk->usercss ){
+                       $this->getHeadScripts( $sk ) . $this->getHeadItems(),
+               ) );
+               if ( $sk->usercss ) {
                        $ret .= Html::inlineStyle( $sk->usercss );
                }
 
-               if( $wgEnableScriptLoader )
-                       $ret .= $this->getScriptLoaderJs();
-
-               if ($wgUseTrackbacks && $this->isArticleRelated())
+               if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
                        $ret .= $this->getTitle()->trackbackRDF();
+               }
+
+               $closeHead = Html::closeElement( 'head' );
+               if ( $closeHead ) {
+                       $ret .= "$closeHead\n";
+               }
+
+               $bodyAttrs = array();
+
+               # Crazy edit-on-double-click stuff
+               $action = $wgRequest->getVal( 'action', 'view' );
+
+               if (
+                       $this->getTitle()->getNamespace() != NS_SPECIAL &&
+                       !in_array( $action, array( 'edit', 'submit' ) ) &&
+                       $wgUser->getOption( 'editondblclick' )
+               )
+               {
+                       $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
+               }
+
+               # Class bloat
+               $bodyAttrs['class'] = "mediawiki $dir";
+
+               if ( $wgLang->capitalizeAllNouns() ) {
+                       # A <body> class is probably not the best way to do this . . .
+                       $bodyAttrs['class'] .= ' capitalize-all-nouns';
+               }
+               $bodyAttrs['class'] .= ' ns-' . $this->getTitle()->getNamespace();
+               if ( $this->getTitle()->getNamespace() == NS_SPECIAL ) {
+                       $bodyAttrs['class'] .= ' ns-special';
+               } elseif ( $this->getTitle()->isTalkPage() ) {
+                       $bodyAttrs['class'] .= ' ns-talk';
+               } else {
+                       $bodyAttrs['class'] .= ' ns-subject';
+               }
+               $bodyAttrs['class'] .= ' ' . Sanitizer::escapeClass( 'page-' . $this->getTitle()->getPrefixedText() );
+               $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $wgUser->getSkin()->getSkinName() );
+
+               $ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";
 
-               $ret .= "</head>\n";
                return $ret;
        }
 
-       /*
-        * gets the global variables and mScripts
+       /**
+        * Gets the global variables and mScripts; also adds userjs to the end if
+        * enabled
         *
-        * also adds userjs to the end if enabled:
-       */
-       function getHeadScripts() {
-               global $wgUser, $wgJsMimeType;
-               $sk = $wgUser->getSkin();
+        * @param $sk Skin object to use
+        * @return String: HTML fragment
+        */
+       function getHeadScripts( Skin $sk ) {
+               global $wgUser, $wgRequest, $wgJsMimeType, $wgUseSiteJs;
+               global $wgStylePath, $wgStyleVersion;
 
-               $vars = Skin::makeGlobalVariablesScript( $sk->getSkinName() );
+               $scripts = Skin::makeGlobalVariablesScript( $sk->getSkinName() ) . "\n";
+               $scripts .= Html::linkedScript( "{$wgStylePath}/common/wikibits.js?$wgStyleVersion" );
+
+               // add site JS if enabled
+               if( $wgUseSiteJs ) {
+                       $jsCache = $wgUser->isLoggedIn() ? '&smaxage=0' : '';
+                       $this->addScriptFile(
+                               Skin::makeUrl(
+                                       '-',
+                                       "action=raw$jsCache&gen=js&useskin=" .
+                                       urlencode( $sk->getSkinName() )
+                               )
+                       );
+               }
 
-               //add user js if enabled:
+               // add user JS if enabled
                if( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {
-                       $userpage = $wgUser->getUserPage();
-                       $userjs = Skin::makeUrl(
-                               $userpage->getPrefixedText() . '/' . $sk->getSkinName() . '.js',
-                               'action=raw&ctype=' . $wgJsMimeType );
-                       $this->addScriptFile( $userjs );
+                       $action = $wgRequest->getVal( 'action', 'view' );
+                       if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {
+                               # XXX: additional security check/prompt?
+                               $this->addInlineScript( $wgRequest->getText( 'wpTextbox1' ) );
+                       } else {
+                               $userpage = $wgUser->getUserPage();
+                               $names = array( 'common', $sk->getSkinName() );
+                               foreach( $names as $name ) {
+                                       $scriptpage = Title::makeTitleSafe(
+                                               NS_USER,
+                                               $userpage->getDBkey() . '/' . $name . '.js'
+                                       );
+                                       if ( $scriptpage && $scriptpage->exists() ) {
+                                               $userjs = $scriptpage->getLocalURL( 'action=raw&ctype=' . $wgJsMimeType );
+                                               $this->addScriptFile( $userjs );
+                                       }
+                               }
+                       }
                }
 
-               return $vars . "\n" . $this->mScripts;
+               $scripts .= "\n" . $this->mScripts;
+               return $scripts;
        }
 
+       /**
+        * Add default \<meta\> tags
+        */
        protected function addDefaultMeta() {
                global $wgVersion, $wgHtml5;
 
@@ -1815,7 +2261,7 @@ class OutputPage {
                $called = true;
 
                if ( !$wgHtml5 ) {
-                       $this->addMeta( 'http:Content-Style-Type', 'text/css' ); //bug 15835
+                       $this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835
                }
                $this->addMeta( 'generator', "MediaWiki $wgVersion" );
 
@@ -1831,7 +2277,14 @@ class OutputPage {
                                "/<.*?" . ">/" => '',
                                "/_/" => ' '
                        );
-                       $this->addMeta( 'keywords', preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ) ) );
+                       $this->addMeta(
+                               'keywords',
+                               preg_replace(
+                                       array_keys( $strip ),
+                                       array_values( $strip ),
+                                       implode( ',', $this->mKeywords )
+                               )
+                       );
                }
        }
 
@@ -1839,7 +2292,7 @@ class OutputPage {
         * @return string HTML tag links to be put in the header.
         */
        public function getHeadLinks() {
-               global $wgRequest, $wgFeed;
+               global $wgFeed;
 
                // Ideally this should happen earlier, somewhere. :P
                $this->addDefaultMeta();
@@ -1856,7 +2309,9 @@ class OutputPage {
                        $tags[] = Html::element( 'meta',
                                array(
                                        $a => $tag[0],
-                                       'content' => $tag[1] ) );
+                                       'content' => $tag[1]
+                               )
+                       );
                }
                foreach ( $this->mLinktags as $tag ) {
                        $tags[] = Html::element( 'link', $tag );
@@ -1872,7 +2327,9 @@ class OutputPage {
                                $tags[] = $this->feedLink(
                                        $format,
                                        $link,
-                                       wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() ) ); # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
+                                       # Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)
+                                       wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )
+                               );
                        }
 
                        # Recent changes feed should appear on every page (except recentchanges,
@@ -1883,23 +2340,24 @@ class OutputPage {
                        # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
                        # If so, use it instead.
 
-                       global $wgOverrideSiteFeed, $wgSitename, $wgFeedClasses;
+                       global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
                        $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
 
                        if ( $wgOverrideSiteFeed ) {
                                foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {
-                                       $tags[] = $this->feedLink (
+                                       $tags[] = $this->feedLink(
                                                $type,
                                                htmlspecialchars( $feedUrl ),
-                                               wfMsg( "site-{$type}-feed", $wgSitename ) );
+                                               wfMsg( "site-{$type}-feed", $wgSitename )
+                                       );
                                }
-                       }
-                       else if ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
-                               foreach( $wgFeedClasses as $format => $class ) {
+                       } elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {
+                               foreach ( $wgAdvertisedFeedTypes as $format ) {
                                        $tags[] = $this->feedLink(
                                                $format,
                                                $rctitle->getLocalURL( "feed={$format}" ),
-                                               wfMsg( "site-{$format}-feed", $wgSitename ) ); # For grep: 'site-rss-feed', 'site-atom-feed'.
+                                               wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.
+                                       );
                                }
                        }
                }
@@ -1908,56 +2366,44 @@ class OutputPage {
        }
 
        /**
-        * Return URLs for each supported syndication format for this page.
-        * @return array associating format keys with URLs
-        */
-       public function getSyndicationLinks() {
-               global $wgFeedClasses;
-               $links = array();
-
-               if( $this->isSyndicated() ) {
-                       if( is_string( $this->getFeedAppendQuery() ) ) {
-                               $appendQuery = "&" . $this->getFeedAppendQuery();
-                       } else {
-                               $appendQuery = "";
-                       }
-
-                       foreach( $wgFeedClasses as $format => $class ) {
-                               $links[$format] = $this->getTitle()->getLocalUrl( "feed=$format{$appendQuery}" );
-                       }
-               }
-               return $links;
-       }
-
-       /**
-        * Generate a <link rel/> for an RSS feed.
+        * Generate a <link rel/> for a feed.
+        *
+        * @param $type String: feed type
+        * @param $url String: URL to the feed
+        * @param $text String: value of the "title" attribute
+        * @return String: HTML fragment
         */
        private function feedLink( $type, $url, $text ) {
                return Html::element( 'link', array(
                        'rel' => 'alternate',
                        'type' => "application/$type+xml",
                        'title' => $text,
-                       'href' => $url ) );
+                       'href' => $url )
+               );
        }
 
        /**
         * Add a local or specified stylesheet, with the given media options.
         * Meant primarily for internal use...
         *
-        * @param $media -- to specify a media type, 'screen', 'printable', 'handheld' or any.
-        * @param $conditional -- for IE conditional comments, specifying an IE version
-        * @param $dir -- set to 'rtl' or 'ltr' for direction-specific sheets
+        * @param $style String: URL to the file
+        * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.
+        * @param $condition String: for IE conditional comments, specifying an IE version
+        * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets
         */
-       public function addStyle( $style, $media='', $condition='', $dir='' ) {
+       public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {
                $options = array();
                // Even though we expect the media type to be lowercase, but here we
                // force it to lowercase to be safe.
-               if( $media )
+               if( $media ) {
                        $options['media'] = $media;
-               if( $condition )
+               }
+               if( $condition ) {
                        $options['condition'] = $condition;
-               if( $dir )
+               }
+               if( $dir ) {
                        $options['dir'] = $dir;
+               }
                $this->styles[$style] = $options;
        }
 
@@ -1974,24 +2420,35 @@ class OutputPage {
         * These will be applied to various media & IE conditionals.
         */
        public function buildCssLinks() {
+               return implode( "\n", $this->buildCssLinksArray() );
+       }
+
+       public function buildCssLinksArray() {
                $links = array();
                foreach( $this->styles as $file => $options ) {
                        $link = $this->styleLink( $file, $options );
-                       if( $link )
-                               $links[] = $link;
+                       if( $link ) {
+                               $links[$file] = $link;
+                       }
                }
-
-               return implode( "\n", $links );
+               return $links;
        }
 
+       /**
+        * Generate \<link\> tags for stylesheets
+        *
+        * @param $style String: URL to the file
+        * @param $options Array: option, can contain 'condition', 'dir', 'media'
+        *                 keys
+        * @return String: HTML fragment
+        */
        protected function styleLink( $style, $options ) {
-               global $wgRequest;
-
                if( isset( $options['dir'] ) ) {
                        global $wgContLang;
                        $siteDir = $wgContLang->getDir();
-                       if( $siteDir != $options['dir'] )
+                       if( $siteDir != $options['dir'] ) {
                                return '';
+                       }
                }
 
                if( isset( $options['media'] ) ) {
@@ -2021,6 +2478,12 @@ class OutputPage {
                return $link;
        }
 
+       /**
+        * Transform "media" attribute based on request parameters
+        *
+        * @param $media String: current value of the "media" attribute
+        * @return String: modified value of the "media" attribute
+        */
        function transformCssMedia( $media ) {
                global $wgRequest, $wgHandheldForIPhone;
 
@@ -2059,37 +2522,18 @@ class OutputPage {
         * for when rate limiting has triggered.
         */
        public function rateLimited() {
-
-               $this->setPageTitle(wfMsg('actionthrottled'));
+               $this->setPageTitle( wfMsg( 'actionthrottled' ) );
                $this->setRobotPolicy( 'noindex,follow' );
                $this->setArticleRelated( false );
                $this->enableClientCache( false );
                $this->mRedirect = '';
                $this->clearHTML();
-               $this->setStatusCode(503);
+               $this->setStatusCode( 503 );
                $this->addWikiMsg( 'actionthrottledtext' );
 
                $this->returnToMain( null, $this->getTitle() );
        }
 
-       /**
-        * Show an "add new section" link?
-        *
-        * @return bool
-        */
-       public function showNewSectionLink() {
-               return $this->mNewSectionLink;
-       }
-
-       /**
-       * Forcibly hide the new section link?
-       *
-       * @return bool
-       */
-       public function forceHideNewSectionLink() {
-               return $this->mHideNewSectionLink;
-       }
-
        /**
         * Show a warning about slave lag
         *
@@ -2097,7 +2541,7 @@ class OutputPage {
         * then the warning is a bit more obvious. If the lag is
         * lower than $wgSlaveLagWarning, then no warning is shown.
         *
-        * @param int $lag Slave lag
+        * @param $lag Integer: slave lag
         */
        public function showLagWarning( $lag ) {
                global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
@@ -2151,11 +2595,13 @@ class OutputPage {
         *
         * For example:
         *
-        *    $wgOut->wrapWikiMsg( '<div class="error">$1</div>', 'some-error' );
+        *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );
         *
         * Is equivalent to:
         *
-        *    $wgOut->addWikiText( '<div class="error">' . wfMsgNoTrans( 'some-error' ) . '</div>' );
+        *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );
+        *
+        * The newline after opening div is needed in some wikitext. See bug 19226.
         */
        public function wrapWikiMsg( $wrap /*, ...*/ ) {
                $msgSpecs = func_get_args();
@@ -2179,4 +2625,28 @@ class OutputPage {
                }
                $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
        }
+
+       /**
+        * Include jQuery core. Use this to avoid loading it multiple times
+        * before we get a usable script loader.
+        *
+        * @param $modules Array: list of jQuery modules which should be loaded
+        * @return Array: the list of modules which were not loaded.
+        * @since 1.16
+        */
+       public function includeJQuery( $modules = array() ) {
+               global $wgStylePath, $wgStyleVersion, $wgJQueryVersion, $wgJQueryMinified;
+
+               $supportedModules = array( /** TODO: add things here */ );
+               $unsupported = array_diff( $modules, $supportedModules );
+
+               $min = $wgJQueryMinified ? '.min' : '';
+               $url = "$wgStylePath/common/jquery-$wgJQueryVersion$min.js?$wgStyleVersion";
+               if ( !$this->mJQueryDone ) {
+                       $this->mJQueryDone = true;
+                       $this->mScripts = Html::linkedScript( $url ) . "\n" . $this->mScripts;
+               }
+               return $unsupported;
+       }
+
 }