Added wgIsMainPage (Title->isMainPage) to mw.config
[lhc/web/wiklou.git] / includes / OutputPage.php
index b9653b1..9385c1f 100644 (file)
@@ -4,62 +4,206 @@ if ( !defined( 'MEDIAWIKI' ) ) {
 }
 
 /**
+ * This class should be covered by a general architecture document which does
+ * not exist as of January 2011.  This is one of the Core classes and should
+ * be read at least once by any new developers.
+ *
+ * This class is used to prepare the final rendering. A skin is then
+ * applied to the output parameters (links, javascript, html, categories ...).
+ *
+ * Another class (fixme) handles sending the whole page to the client.
+ *
+ * Some comments comes from a pairing session between Zak Greant and Ashar Voultoiz
+ * in November 2010.
+ *
  * @todo document
  */
 class OutputPage {
-       var $mMetatags = array(), $mKeywords = array(), $mLinktags = array();
+       /// Should be private. Used with addMeta() which adds <meta>
+       var $mMetatags = array();
+
+       /// <meta keyworkds="stuff"> most of the time the first 10 links to an article
+       var $mKeywords = array();
+
+       var $mLinktags = array();
+
+       /// Additional stylesheets. Looks like this is for extensions. Might be replaced by resource loader.
        var $mExtStyles = array();
-       var $mPagetitle = '', $mBodytext = '';
+
+       /// Should be private - has getter and setter. Contains the HTML title
+       var $mPagetitle = '';
+
+       /// Contains all of the <body> content. Should be private we got set/get accessors and the append() method.
+       var $mBodytext = '';
 
        /**
-        * Holds the debug lines that will be outputted as comments in page source if
+        * Holds the debug lines that will be output as comments in page source if
         * $wgDebugComments is enabled. See also $wgShowDebug.
         * TODO: make a getter method for this
         */
-       public $mDebugtext = '';
+       public $mDebugtext = ''; // TODO: we might want to replace it by wfDebug() wfDebugLog()
+
+       /// Should be private. Stores contents of <title> tag
+       var $mHTMLtitle = '';
+
+       /// Should be private. Is the displayed content related to the source of the corresponding wiki article.
+       var $mIsarticle = true;
+
+       /**
+        * Should be private. We have to set isPrintable(). Some pages should
+        * never be printed (ex: redirections).
+        */
+       var $mPrintable = false;
+
+       /**
+        * Should be private. We have set/get/append methods.
+        *
+        * Contains the page subtitle. Special pages usually have some links here.
+        * Don't confuse with site subtitle added by skins.
+        */
+       var $mSubtitle = '';
+
+       var $mRedirect = '';
+       var $mStatusCode;
+
+       /**
+        * mLastModified and mEtag are used for sending cache control.
+        * The whole caching system should probably be moved into its own class.
+        */
+       var $mLastModified = '';
+
+       /**
+        * Should be private. No getter but used in sendCacheControl();
+        * Contains an HTTP Entity Tags (see RFC 2616 section 3.13) which is used
+        * as a unique identifier for the content. It is later used by the client
+        * to compare its cached version with the server version. Client sends
+        * headers If-Match and If-None-Match containing its locally cached ETAG value.
+        *
+        * To get more information, you will have to look at HTTP1/1 protocols which
+        * is properly described in RFC 2616 : http://tools.ietf.org/html/rfc2616
+        */
+       var $mETag = false;
+
+       var $mCategoryLinks = array();
+       var $mCategories = array();
+
+       /// Should be private. Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
+       var $mLanguageLinks = array();
+
+       /**
+        * Should be private. Used for JavaScript (pre resource loader)
+        * We should split js / css.
+        * mScripts content is inserted as is in <head> by Skin. This might contains
+        * either a link to a stylesheet or inline css.
+        */
+       var $mScripts = '';
+
+       /**
+        * Inline CSS styles. Use addInlineStyle() sparsingly
+        */
+       var $mInlineStyles = '';
+
+       //
+       var $mLinkColours;
+
+       /**
+        * Used by skin template.
+        * Example: $tpl->set( 'displaytitle', $out->mPageLinkTitle );
+        */
+       var $mPageLinkTitle = '';
 
-       var $mHTMLtitle = '', $mIsarticle = true, $mPrintable = false;
-       var $mSubtitle = '', $mRedirect = '', $mStatusCode;
-       var $mLastModified = '', $mETag = false;
-       var $mCategoryLinks = array(), $mCategories = array(), $mLanguageLinks = array();
+       /// Array of elements in <head>. Parser might add its own headers!
+       var $mHeadItems = array();
 
-       var $mScripts = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();
+       // Next variables probably comes from the resource loader @todo FIXME
        var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();
        var $mResourceLoader;
+
+       /** @fixme is this still used ?*/
        var $mInlineMsg = array();
 
        var $mTemplateIds = array();
+       var $mImageTimeKeys = array();
+
+       # What level of 'untrustworthiness' is allowed in CSS/JS modules loaded on this page?
+       # @see ResourceLoaderModule::$origin
+       # ResourceLoaderModule::ORIGIN_ALL is assumed unless overridden;
+       protected $mAllowedModules = array(
+               ResourceLoaderModule::TYPE_COMBINED => ResourceLoaderModule::ORIGIN_ALL,
+       );
 
-       var $mAllowUserJs;
-       var $mSuppressQuickbar = false;
+       /**
+        * @EasterEgg I just love the name for this self documenting variable.
+        * @todo document
+        */
        var $mDoNothing = false;
+
+       // Parser related.
        var $mContainsOldMagic = 0, $mContainsNewMagic = 0;
+
+       /**
+        * Should be private. Has get/set methods properly documented.
+        * Stores "article flag" toggle.
+        */
        var $mIsArticleRelated = true;
-       protected $mParserOptions = null; // lazy initialised, use parserOptions()
 
+       /// lazy initialised, use parserOptions()
+       protected $mParserOptions = null;
+
+       /**
+        * Handles the atom / rss links.
+        * We probably only support atom in 2011.
+        * Looks like a private variable.
+        * @see $wgAdvertisedFeedTypes
+        */
        var $mFeedLinks = array();
 
+       // Gwicke work on squid caching? Roughly from 2003.
        var $mEnableClientCache = true;
+
+       /**
+        * Flag if output should only contain the body of the article.
+        * Should be private.
+        */
        var $mArticleBodyOnly = false;
 
        var $mNewSectionLink = false;
        var $mHideNewSectionLink = false;
+
+       /**
+        * Comes from the parser. This was probably made to load CSS/JS only
+        * if we had <gallery>. Used directly in CategoryPage.php
+        * Looks like resource loader can replace this.
+        */
        var $mNoGallery = false;
+
+       // should be private.
        var $mPageTitleActionText = '';
        var $mParseWarnings = array();
+
+       // Cache stuff. Looks like mEnableClientCache
        var $mSquidMaxage = 0;
+
+       // @todo document
+       var $mPreventClickjacking = true;
+
+       /// should be private. To include the variable {{REVISIONID}}
        var $mRevisionId = null;
-       protected $mTitle = null;
+
+       private $mContext;
 
        /**
         * An array of stylesheet filenames (relative from skins path), with options
         * for CSS media, IE conditions, and RTL/LTR direction.
         * For internal use; add settings in the skin via $this->addStyle()
+        *
+        * Style again! This seems like a code duplication since we already have
+        * mStyles. This is what makes OpenSource amazing.
         */
        var $styles = array();
 
        /**
-        * Whether to load jQuery core.
+        * Whether jQuery is already handled.
         */
        protected $mJQueryDone = false;
 
@@ -71,12 +215,16 @@ class OutputPage {
        );
 
        /**
-        * Constructor
-        * Initialise private variables
+        * Constructor for OutputPage. This should not be called directly.
+        * Instead a new RequestContext should be created and it will implicitly create
+        * a OutputPage tied to that context.
         */
-       function __construct() {
-               global $wgAllowUserJs;
-               $this->mAllowUserJs = $wgAllowUserJs;
+       function __construct( RequestContext $context = null ) {
+               if ( !isset($context) ) {
+                       # Extensions should use `new RequestContext` instead of `new OutputPage` now.
+                       wfDeprecated( __METHOD__ );
+               }
+               $this->mContext = $context;
        }
 
        /**
@@ -104,7 +252,6 @@ class OutputPage {
         * Set the HTTP status code to send with the output.
         *
         * @param $statusCode Integer
-        * @return nothing
         */
        public function setStatusCode( $statusCode ) {
                $this->mStatusCode = $statusCode;
@@ -114,8 +261,8 @@ class OutputPage {
         * Add a new <meta> tag
         * To add an http-equiv meta tag, precede the name with "http:"
         *
-        * @param $name tag name
-        * @param $val tag value
+        * @param $name String tag name
+        * @param $val String tag value
         */
        function addMeta( $name, $val ) {
                array_push( $this->mMetatags, array( $name, $val ) );
@@ -151,11 +298,24 @@ class OutputPage {
         *                 "rel" attribute will be automatically added
         */
        function addMetadataLink( $linkarr ) {
+               $linkarr['rel'] = $this->getMetadataAttribute();
+               $this->addLink( $linkarr );
+       }
+
+       /**
+        * Get the value of the "rel" attribute for metadata links
+        *
+        * @return String
+        */
+       private function getMetadataAttribute() {
                # note: buggy CC software only reads first "meta" link
                static $haveMeta = false;
-               $linkarr['rel'] = $haveMeta ? 'alternate meta' : 'meta';
-               $this->addLink( $linkarr );
-               $haveMeta = true;
+               if ( $haveMeta ) {
+                       return 'alternate meta';
+               } else {
+                       $haveMeta = true;
+                       return 'meta';
+               }
        }
 
        /**
@@ -180,7 +340,7 @@ class OutputPage {
        }
 
        /**
-        * Get all links added by extensions
+        * Get all styles added by extensions
         *
         * @return Array
         */
@@ -226,13 +386,40 @@ class OutputPage {
                return $this->mScripts . $this->getHeadItems();
        }
 
+       /**
+        * Filter an array of modules to remove insufficiently trustworthy members, and modules
+        * which are no longer registered (eg a page is cached before an extension is disabled)
+        * @param $modules Array
+        * @param $position String if not null, only return modules with this position
+        * @return Array
+        */
+       protected function filterModules( $modules, $position = null, $type = ResourceLoaderModule::TYPE_COMBINED ){
+               $resourceLoader = $this->getResourceLoader();
+               $filteredModules = array();
+               foreach( $modules as $val ){
+                       $module = $resourceLoader->getModule( $val );
+                       if( $module instanceof ResourceLoaderModule
+                               && $module->getOrigin() <= $this->getAllowedModules( $type )
+                               && ( is_null( $position ) || $module->getPosition() == $position ) )
+                       {
+                               $filteredModules[] = $val;
+                       }
+               }
+               return $filteredModules;
+       }
+
        /**
         * Get the list of modules to include on this page
         *
+        * @param $filter Bool whether to filter out insufficiently trustworthy modules
+        * @param $position String if not null, only return modules with this position
         * @return Array of module names
         */
-       public function getModules() {
-               return $this->mModules;
+       public function getModules( $filter = false, $position = null, $param = 'mModules' ) {
+               $modules = array_values( array_unique( $this->$param ) );
+               return $filter
+                       ? $this->filterModules( $modules, $position )
+                       : $modules;
        }
 
        /**
@@ -250,8 +437,8 @@ class OutputPage {
         * Get the list of module JS to include on this page
         * @return array of module names
         */
-       public function getModuleScripts() {
-               return $this->mModuleScripts;
+       public function getModuleScripts( $filter = false, $position = null ) {
+               return $this->getModules( $filter, $position, 'mModuleScripts' );
        }
 
        /**
@@ -270,8 +457,8 @@ class OutputPage {
         *
         * @return Array of module names
         */
-       public function getModuleStyles() {
-               return $this->mModuleStyles;
+       public function getModuleStyles( $filter = false, $position = null ) {
+               return $this->getModules( $filter,  $position, 'mModuleStyles' );
        }
 
        /**
@@ -290,8 +477,8 @@ class OutputPage {
         *
         * @return Array of module names
         */
-       public function getModuleMessages() {
-               return $this->mModuleMessages;
+       public function getModuleMessages( $filter = false, $position = null ) {
+               return $this->getModules( $filter, $position, 'mModuleMessages' );
        }
 
        /**
@@ -377,7 +564,7 @@ class OutputPage {
         * @return Boolean: true iff cache-ok headers was sent.
         */
        public function checkLastModified( $timestamp ) {
-               global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;
+               global $wgCachePages, $wgCacheEpoch;
 
                if ( !$timestamp || $timestamp == '19700101000000' ) {
                        wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );
@@ -387,7 +574,7 @@ class OutputPage {
                        wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );
                        return false;
                }
-               if( $wgUser->getOption( 'nocache' ) ) {
+               if( $this->getUser()->getOption( 'nocache' ) ) {
                        wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );
                        return false;
                }
@@ -395,7 +582,7 @@ class OutputPage {
                $timestamp = wfTimestamp( TS_MW, $timestamp );
                $modifiedTimes = array(
                        'page' => $timestamp,
-                       'user' => $wgUser->getTouched(),
+                       'user' => $this->getUser()->getTouched(),
                        'epoch' => $wgCacheEpoch
                );
                wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );
@@ -444,7 +631,7 @@ class OutputPage {
                # Give a 304 response code and disable body output
                wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );
                ini_set( 'zlib.output_compression', 0 );
-               $wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );
+               $this->getRequest()->response()->header( "HTTP/1.1 304 Not Modified" );
                $this->sendCacheControl();
                $this->disable();
 
@@ -576,13 +763,36 @@ class OutputPage {
                return $this->mPagetitle;
        }
 
+       /**
+        * Get the RequestContext used in this instance
+        *
+        * @return RequestContext
+        */
+       private function getContext() {
+               if ( !isset($this->mContext) ) {
+                       wfDebug( __METHOD__ . " called and \$mContext is null. Using RequestContext::getMain(); for sanity\n" );
+                       $this->mContext = RequestContext::getMain();
+               }
+               return $this->mContext;
+       }
+
+       /**
+        * Get the WebRequest being used for this instance
+        *
+        * @return WebRequest
+        * @since 1.18
+        */
+       public function getRequest() {
+               return $this->getContext()->getRequest();
+       }
+
        /**
         * Set the Title object to use
         *
         * @param $t Title object
         */
        public function setTitle( $t ) {
-               $this->mTitle = $t;
+               $this->getContext()->setTitle( $t );
        }
 
        /**
@@ -591,13 +801,27 @@ class OutputPage {
         * @return Title
         */
        public function getTitle() {
-               if ( $this->mTitle instanceof Title ) {
-                       return $this->mTitle;
-               } else {
-                       wfDebug( __METHOD__ . " called and \$mTitle is null. Return \$wgTitle for sanity\n" );
-                       global $wgTitle;
-                       return $wgTitle;
-               }
+               return $this->getContext()->getTitle();
+       }
+
+       /**
+        * Get the User object used in this instance
+        *
+        * @return User
+        * @since 1.18
+        */
+       public function getUser() {
+               return $this->getContext()->getUser();
+       }
+
+       /**
+        * Get the Skin object used to render this instance
+        *
+        * @return Skin
+        * @since 1.18
+        */
+       public function getSkin() {
+               return $this->getContext()->getSkin();
        }
 
        /**
@@ -825,7 +1049,7 @@ class OutputPage {
        /**
         * Get the list of language links
         *
-        * @return Associative array mapping language code to the page name
+        * @return Array of Interwiki Prefixed (non DB key) Titles (e.g. 'fr:Test page')
         */
        public function getLanguageLinks() {
                return $this->mLanguageLinks;
@@ -834,10 +1058,10 @@ class OutputPage {
        /**
         * Add an array of categories, with names in the keys
         *
-        * @param $categories Associative array mapping category name to its sort key
+        * @param $categories Array mapping category name => sort key
         */
        public function addCategoryLinks( $categories ) {
-               global $wgUser, $wgContLang;
+               global $wgContLang;
 
                if ( !is_array( $categories ) || count( $categories ) == 0 ) {
                        return;
@@ -850,12 +1074,13 @@ class OutputPage {
 
                # Fetch existence plus the hiddencat property
                $dbr = wfGetDB( DB_SLAVE );
-               $pageTable = $dbr->tableName( 'page' );
-               $where = $lb->constructSet( 'page', $dbr );
-               $propsTable = $dbr->tableName( 'page_props' );
-               $sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, page_latest, pp_value
-                       FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";
-               $res = $dbr->query( $sql, __METHOD__ );
+               $res = $dbr->select( array( 'page', 'page_props' ),
+                       array( 'page_id', 'page_namespace', 'page_title', 'page_len', 'page_is_redirect', 'page_latest', 'pp_value' ),
+                       $lb->constructSet( 'page', $dbr ),
+                       __METHOD__,
+                       array(),
+                       array( 'page_props' => array( 'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' ) ) )
+               );
 
                # Add the results to the link cache
                $lb->addResultToCache( LinkCache::singleton(), $res );
@@ -875,7 +1100,6 @@ class OutputPage {
 
                # Add the remaining categories to the skin
                if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {
-                       $sk = $wgUser->getSkin();
                        foreach ( $categories as $category => $type ) {
                                $origcategory = $category;
                                $title = Title::makeTitleSafe( NS_CATEGORY, $category );
@@ -887,7 +1111,7 @@ class OutputPage {
                                }
                                $text = $wgContLang->convertHtml( $title->getText() );
                                $this->mCategories[] = $title->getText();
-                               $this->mCategoryLinks[$type][] = $sk->link( $title, $text );
+                               $this->mCategoryLinks[$type][] = $this->getSkin()->link( $title, $text );
                        }
                }
        }
@@ -895,7 +1119,7 @@ class OutputPage {
        /**
         * Reset the category links (but not the category list) and add $categories
         *
-        * @param $categories Associative array mapping category name to its sort key
+        * @param $categories Array mapping category name => sort key
         */
        public function setCategoryLinks( $categories ) {
                $this->mCategoryLinks = array();
@@ -924,36 +1148,58 @@ class OutputPage {
        }
 
        /**
-        * Suppress the quickbar from the output, only for skin supporting
-        * the quickbar
+        * Do not allow scripts which can be modified by wiki users to load on this page;
+        * only allow scripts bundled with, or generated by, the software.
         */
-       public function suppressQuickbar() {
-               $this->mSuppressQuickbar = true;
+       public function disallowUserJs() {
+               $this->reduceAllowedModules(
+                       ResourceLoaderModule::TYPE_SCRIPTS,
+                       ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL
+               );
        }
 
        /**
-        * Return whether the quickbar should be suppressed from the output
-        *
+        * Return whether user JavaScript is allowed for this page
+        * @deprecated since 1.18 Load modules with ResourceLoader, and origin and
+        *     trustworthiness is identified and enforced automagically.
         * @return Boolean
         */
-       public function isQuickbarSuppressed() {
-               return $this->mSuppressQuickbar;
+       public function isUserJsAllowed() {
+               return $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS ) >= ResourceLoaderModule::ORIGIN_USER_INDIVIDUAL;
        }
 
        /**
-        * Remove user JavaScript from scripts to load
+        * Show what level of JavaScript / CSS untrustworthiness is allowed on this page
+        * @see ResourceLoaderModule::$origin
+        * @param $type String ResourceLoaderModule TYPE_ constant
+        * @return Int ResourceLoaderModule ORIGIN_ class constant
         */
-       public function disallowUserJs() {
-               $this->mAllowUserJs = false;
+       public function getAllowedModules( $type ){
+               if( $type == ResourceLoaderModule::TYPE_COMBINED ){
+                       return min( array_values( $this->mAllowedModules ) );
+               } else {
+                       return isset( $this->mAllowedModules[$type] )
+                               ? $this->mAllowedModules[$type]
+                               : ResourceLoaderModule::ORIGIN_ALL;
+               }
        }
 
        /**
-        * Return whether user JavaScript is allowed for this page
-        *
-        * @return Boolean
+        * Set the highest level of CSS/JS untrustworthiness allowed
+        * @param  $type String ResourceLoaderModule TYPE_ constant
+        * @param  $level Int ResourceLoaderModule class constant
         */
-       public function isUserJsAllowed() {
-               return $this->mAllowUserJs;
+       public function setAllowedModules( $type, $level ){
+               $this->mAllowedModules[$type] = $level;
+       }
+
+       /**
+        * As for setAllowedModules(), but don't inadvertantly make the page more accessible
+        * @param  $type String
+        * @param  $level Int ResourceLoaderModule class constant
+        */
+       public function reduceAllowedModules( $type, $level ){
+               $this->mAllowedModules[$type] = min( $this->getAllowedModules($type), $level );
        }
 
        /**
@@ -999,20 +1245,12 @@ class OutputPage {
                $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
+        * @return ParserOptions object
         */
        public function parserOptions( $options = null ) {
                if ( !$this->mParserOptions ) {
@@ -1042,6 +1280,26 @@ class OutputPage {
                return $this->mRevisionId;
        }
 
+       /**
+        * Get the templates used on this page
+        *
+        * @return Array (namespace => dbKey => revId)
+        * @since 1.18
+        */
+       public function getTemplateIds() {
+               return $this->mTemplateIds;
+       }
+
+       /**
+        * Get the files used on this page
+        *
+        * @return Array (dbKey => array('time' => MW timestamp or null, 'sha1' => sha1 or ''))
+        * @since 1.18
+        */
+       public function getImageTimeKeys() {
+               return $this->mImageTimeKeys;
+       }
+
        /**
         * Convert wikitext to HTML and add it to the buffer
         * Default assumes that the current page title will be used.
@@ -1117,43 +1375,6 @@ class OutputPage {
                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 = $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 );
-       }
-
-       /**
-        * @deprecated use addWikiTextTidy()
-        */
-       public function addSecondaryWikiText( $text, $linestart = true ) {
-               wfDeprecated( __METHOD__ );
-               $this->addWikiTextTitleTidy( $text, $this->getTitle(), $linestart );
-       }
-
        /**
         * Add a ParserOutput object, but without Html
         *
@@ -1172,14 +1393,19 @@ class OutputPage {
                $this->mNoGallery = $parserOutput->getNoGallery();
                $this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );
                $this->addModules( $parserOutput->getModules() );
-               // Versioning...
-               foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {
+
+               // Template versioning...
+               foreach ( (array)$parserOutput->getTemplateIds() as $ns => $dbks ) {
                        if ( isset( $this->mTemplateIds[$ns] ) ) {
                                $this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];
                        } else {
                                $this->mTemplateIds[$ns] = $dbks;
                        }
                }
+               // File versioning...
+               foreach ( (array)$parserOutput->getImageTimeKeys() as $dbk => $data ) {
+                       $this->mImageTimeKeys[$dbk] = $data;
+               }
 
                // Hooks registered in the object
                global $wgParserOutputHooks;
@@ -1226,24 +1452,44 @@ class OutputPage {
         * @param $interface Boolean: use interface language ($wgLang instead of
         *                   $wgContLang) while parsing language sensitive magic
         *                   words like GRAMMAR and PLURAL
+        * @param $language  Language object: target language object, will override
+        *                   $interface
         * @return String: HTML
         */
-       public function parse( $text, $linestart = true, $interface = false ) {
+       public function parse( $text, $linestart = true, $interface = false, $language = null ) {
+               // Check one for one common cause for parser state resetting
+               $callers = wfGetAllCallers( 10 );
+               if ( strpos( $callers, 'Parser::extensionSubstitution' ) !== false ) {
+                       throw new MWException( "wfMsg* function with parsing cannot be used " .
+                               "inside a tag hook. Should use parser->recursiveTagParse() instead" );
+               }
+
                global $wgParser;
+
                if( is_null( $this->getTitle() ) ) {
                        throw new MWException( 'Empty $mTitle in ' . __METHOD__ );
                }
+
                $popts = $this->parserOptions();
                if ( $interface ) {
                        $popts->setInterfaceMessage( true );
                }
+               if ( $language !== null ) {
+                       $oldLang = $popts->setTargetLanguage( $language );
+               }
+
                $parserOutput = $wgParser->parse(
                        $text, $this->getTitle(), $popts,
                        $linestart, true, $this->mRevisionId
                );
+
                if ( $interface ) {
                        $popts->setInterfaceMessage( false );
                }
+               if ( $language !== null ) {
+                       $popts->setTargetLanguage( $oldLang );
+               }
+
                return $parserOutput->getText();
        }
 
@@ -1268,24 +1514,6 @@ class OutputPage {
                return $parsed;
        }
 
-       /**
-        * @deprecated
-        *
-        * @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 ) {
-                       $this->addParserOutput( $parserOutput );
-                       return true;
-               } else {
-                       return false;
-               }
-       }
-
        /**
         * Set the value of the "s-maxage" part of the "Cache-control" HTTP header
         *
@@ -1333,9 +1561,9 @@ class OutputPage {
         * @return Boolean
         */
        function uncacheableBecauseRequestVars() {
-               global $wgRequest;
-               return $wgRequest->getText( 'useskin', false ) === false
-                       && $wgRequest->getText( 'uselang', false ) === false;
+               $request = $this->getRequest();
+               return $request->getText( 'useskin', false ) === false
+                       && $request->getText( 'uselang', false ) === false;
        }
 
        /**
@@ -1345,8 +1573,7 @@ class OutputPage {
         * @return Boolean
         */
        function haveCacheVaryCookies() {
-               global $wgRequest;
-               $cookieHeader = $wgRequest->getHeader( 'cookie' );
+               $cookieHeader = $this->getRequest()->getHeader( 'cookie' );
                if ( $cookieHeader === false ) {
                        return false;
                }
@@ -1366,11 +1593,13 @@ class OutputPage {
         * Add an HTTP header that will influence on the cache
         *
         * @param $header String: header name
-        * @param $option either an Array or null
+        * @param $option Array|null
+        * @fixme Document the $option parameter; it appears to be for
+        *        X-Vary-Options but what format is acceptable?
         */
        public function addVaryHeader( $header, $option = null ) {
                if ( !array_key_exists( $header, $this->mVaryHeader ) ) {
-                       $this->mVaryHeader[$header] = $option;
+                       $this->mVaryHeader[$header] = (array)$option;
                } elseif( is_array( $option ) ) {
                        if( is_array( $this->mVaryHeader[$header] ) ) {
                                $this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );
@@ -1417,8 +1646,8 @@ class OutputPage {
         *   /w/index.php?title=Main_page&variant=zh-cn should never be served.
         */
        function addAcceptLanguage() {
-               global $wgRequest, $wgContLang;
-               if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
+               global $wgContLang;
+               if( !$this->getRequest()->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {
                        $variants = $wgContLang->getVariants();
                        $aloption = array();
                        foreach ( $variants as $variant ) {
@@ -1426,7 +1655,7 @@ class OutputPage {
                                        continue;
                                } else {
                                        $aloption[] = 'string-contains=' . $variant;
-                                       
+
                                        // IE and some other browsers use another form of language code
                                        // in their Accept-Language header, like "zh-CN" or "zh-TW".
                                        // We should handle these too.
@@ -1442,13 +1671,48 @@ class OutputPage {
                }
        }
 
+       /**
+        * Set a flag which will cause an X-Frame-Options header appropriate for
+        * edit pages to be sent. The header value is controlled by
+        * $wgEditPageFrameOptions.
+        *
+        * This is the default for special pages. If you display a CSRF-protected
+        * form on an ordinary view page, then you need to call this function.
+        */
+       public function preventClickjacking( $enable = true ) {
+               $this->mPreventClickjacking = $enable;
+       }
+
+       /**
+        * Turn off frame-breaking. Alias for $this->preventClickjacking(false).
+        * This can be called from pages which do not contain any CSRF-protected
+        * HTML form.
+        */
+       public function allowClickjacking() {
+               $this->mPreventClickjacking = false;
+       }
+
+       /**
+        * Get the X-Frame-Options header value (without the name part), or false
+        * if there isn't one. This is used by Skin to determine whether to enable
+        * JavaScript frame-breaking, for clients that don't support X-Frame-Options.
+        */
+       public function getFrameOptions() {
+               global $wgBreakFrames, $wgEditPageFrameOptions;
+               if ( $wgBreakFrames ) {
+                       return 'DENY';
+               } elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {
+                       return $wgEditPageFrameOptions;
+               }
+       }
+
        /**
         * Send cache control HTTP headers
         */
        public function sendCacheControl() {
-               global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;
+               global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgUseXVO;
 
-               $response = $wgRequest->response();
+               $response = $this->getRequest()->response();
                if ( $wgUseETag && $this->mETag ) {
                        $response->header( "ETag: $this->mETag" );
                }
@@ -1574,100 +1838,66 @@ class OutputPage {
         * the object, let's actually output it:
         */
        public function output() {
-               global $wgUser, $wgOutputEncoding, $wgRequest;
+               global $wgOutputEncoding;
                global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;
-               global $wgUseAjax, $wgAjaxWatch;
-               global $wgEnableMWSuggest, $wgUniversalEditButton;
-               global $wgArticle;
 
                if( $this->mDoNothing ) {
                        return;
                }
+
                wfProfileIn( __METHOD__ );
+
+               $response = $this->getRequest()->response();
+
                if ( $this->mRedirect != '' ) {
                        # Standards require redirect URLs to be absolute
                        $this->mRedirect = wfExpandUrl( $this->mRedirect );
                        if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {
                                if( !$wgDebugRedirects ) {
                                        $message = self::getStatusMessage( $this->mRedirectCode );
-                                       $wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
+                                       $response->header( "HTTP/1.1 {$this->mRedirectCode} $message" );
                                }
                                $this->mLastModified = wfTimestamp( TS_RFC2822 );
                        }
                        $this->sendCacheControl();
 
-                       $wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );
+                       $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 );
+                               $response->header( 'Location: ' . $this->mRedirect );
                        }
                        wfProfileOut( __METHOD__ );
                        return;
                } elseif ( $this->mStatusCode ) {
                        $message = self::getStatusMessage( $this->mStatusCode );
                        if ( $message ) {
-                               $wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
+                               $response->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );
                        }
                }
 
-               $sk = $wgUser->getSkin();
-
-               // Add base resources
-               $this->addModules( array( 'mediawiki.legacy.wikibits', 'mediawiki.util', 'skins.common' ) );
-
-               // Add various resources if required
-               if ( $wgUseAjax ) {
-                       $this->addModules( 'mediawiki.legacy.ajax' );
-
-                       wfRunHooks( 'AjaxAddScript', array( &$this ) );
-
-                       if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {
-                               $this->addModules( 'mediawiki.action.watch.ajax' );
-                       }
-
-                       if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {
-                               $this->addModules( 'mediawiki.legacy.mwsuggest' );
-                       }
-               }
-
-               if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {
-                       $this->addModules( 'mediawiki.action.view.rightClickEdit' );
-               }
-
-               if( $wgUniversalEditButton ) {
-                       if( isset( $wgArticle ) && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
-                               && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
-                               // Original UniversalEditButton
-                               $msg = wfMsg( 'edit' );
-                               $this->addLink( array(
-                                       'rel' => 'alternate',
-                                       'type' => 'application/x-wiki',
-                                       'title' => $msg,
-                                       'href' => $this->getTitle()->getLocalURL( 'action=edit' )
-                               ) );
-                               // Alternate edit link
-                               $this->addLink( array(
-                                       'rel' => 'edit',
-                                       'title' => $msg,
-                                       'href' => $this->getTitle()->getLocalURL( 'action=edit' )
-                               ) );
-                       }
-               }
-
-
                # Buffer output; final headers may depend on later processing
                ob_start();
 
-               $wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
-               $wgRequest->response()->header( 'Content-language: ' . $wgLanguageCode );
+               $response->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
+               $response->header( 'Content-language: ' . $wgLanguageCode );
+
+               // Prevent framing, if requested
+               $frameOptions = $this->getFrameOptions();
+               if ( $frameOptions ) {
+                       $response->header( "X-Frame-Options: $frameOptions" );
+               }
 
                if ( $this->mArticleBodyOnly ) {
                        $this->out( $this->mBodytext );
                } else {
+                       $this->addDefaultModules();
+
+                       $sk = $this->getSkin( $this->getTitle() );
+
                        // Hook that allows last minute changes to the output page, e.g.
                        // adding of CSS or Javascript by extensions.
                        wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );
@@ -1701,86 +1931,12 @@ class OutputPage {
                print $outs;
        }
 
-       /**
-        * @deprecated use wfReportTime() instead.
-        *
-        * @return String
-        */
-       public function reportTime() {
-               wfDeprecated( __METHOD__ );
-               $time = wfReportTime();
-               return $time;
-       }
-
        /**
         * Produce a "user is blocked" page.
-        *
-        * @param $return Boolean: whether to have a "return to $wgTitle" message or not.
-        * @return nothing
+        * @deprecated since 1.18
         */
-       function blockedPage( $return = true ) {
-               global $wgUser, $wgContLang, $wgLang;
-
-               $this->setPageTitle( wfMsg( 'blockedtitle' ) );
-               $this->setRobotPolicy( 'noindex,nofollow' );
-               $this->setArticleRelated( false );
-
-               $name = User::whoIs( $wgUser->blockedBy() );
-               $reason = $wgUser->blockedFor();
-               if( $reason == '' ) {
-                       $reason = wfMsg( 'blockednoreason' );
-               }
-               $blockTimestamp = $wgLang->timeanddate(
-                       wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true
-               );
-               $ip = wfGetIP();
-
-               $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
-
-               $blockid = $wgUser->mBlock->mId;
-
-               $blockExpiry = $wgUser->mBlock->mExpiry;
-               if ( $blockExpiry == 'infinity' ) {
-                       // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
-                       // Search for localization in 'ipboptions'
-                       $scBlockExpiryOptions = wfMsg( 'ipboptions' );
-                       foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
-                               if ( strpos( $option, ':' ) === false ) {
-                                       continue;
-                               }
-                               list( $show, $value ) = explode( ':', $option );
-                               if ( $value == 'infinite' || $value == 'indefinite' ) {
-                                       $blockExpiry = $show;
-                                       break;
-                               }
-                       }
-               } else {
-                       $blockExpiry = $wgLang->timeanddate(
-                               wfTimestamp( TS_MW, $blockExpiry ),
-                               true
-                       );
-               }
-
-               if ( $wgUser->mBlock->mAuto ) {
-                       $msg = 'autoblockedtext';
-               } else {
-                       $msg = 'blockedtext';
-               }
-
-               /* $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. */
-               $intended = $wgUser->mBlock->mAddress;
-
-               $this->addWikiMsg(
-                       $msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,
-                       $intended, $blockTimestamp
-               );
-
-               # Don't auto-return to special pages
-               if( $return ) {
-                       $return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;
-                       $this->returnToMain( null, $return );
-               }
+       function blockedPage() {
+               throw new UserBlockedError( $this->getUser()->mBlock );
        }
 
        /**
@@ -1845,59 +2001,35 @@ class OutputPage {
 
        /**
         * Display an error page noting that a given permission bit is required.
-        *
+        * @deprecated since 1.18, just throw the exception directly
         * @param $permission String: key required
         */
        public function permissionRequired( $permission ) {
-               global $wgLang;
-
-               $this->setPageTitle( wfMsg( 'badaccess' ) );
-               $this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
-               $this->setRobotPolicy( 'noindex,nofollow' );
-               $this->setArticleRelated( false );
-               $this->mBodytext = '';
-
-               $groups = array_map( array( 'User', 'makeGroupLinkWiki' ),
-                       User::getGroupsWithPermission( $permission ) );
-               if( $groups ) {
-                       $this->addWikiMsg(
-                               'badaccess-groups',
-                               $wgLang->commaList( $groups ),
-                               count( $groups )
-                       );
-               } else {
-                       $this->addWikiMsg( 'badaccess-group0' );
-               }
-               $this->returnToMain();
+               throw new PermissionsError( $permission );
        }
 
        /**
         * Produce the stock "please login to use the wiki" page
         */
        public function loginToUse() {
-               global $wgUser;
-
-               if( $wgUser->isLoggedIn() ) {
-                       $this->permissionRequired( 'read' );
-                       return;
+               if( $this->getUser()->isLoggedIn() ) {
+                       throw new PermissionsError( 'read' );
                }
 
-               $skin = $wgUser->getSkin();
-
                $this->setPageTitle( wfMsg( 'loginreqtitle' ) );
                $this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );
                $this->setRobotPolicy( 'noindex,nofollow' );
                $this->setArticleRelated( false );
 
                $loginTitle = SpecialPage::getTitleFor( 'Userlogin' );
-               $loginLink = $skin->link(
+               $loginLink = $this->getSkin()->link(
                        $loginTitle,
                        wfMsgHtml( 'loginreqlink' ),
                        array(),
                        array( 'returnto' => $this->getTitle()->getPrefixedText() ),
                        array( 'known', 'noclasses' )
                );
-               $this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );
+               $this->addWikiMsgArray( 'loginreqpagetext', array( $loginLink ), array( 'replaceafter' ) );
                $this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );
 
                # Don't return to the main page if the user can't read it
@@ -1911,7 +2043,7 @@ class OutputPage {
        /**
         * Format a list of error messages
         *
-        * @param $errors An array of arrays returned by Title::getUserPermissionsErrors
+        * @param $errors 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.
         */
@@ -1966,9 +2098,6 @@ class OutputPage {
         * @param $action    String: action that was denied or null if unknown
         */
        public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
-               global $wgUser;
-               $skin = $wgUser->getSkin();
-
                $this->setRobotPolicy( 'noindex,nofollow' );
                $this->setArticleRelated( false );
 
@@ -1983,7 +2112,7 @@ class OutputPage {
                        if( $source ) {
                                $this->setPageTitle( wfMsg( 'viewsource' ) );
                                $this->setSubtitle(
-                                       wfMsg( 'viewsourcefor', $skin->linkKnown( $this->getTitle() ) )
+                                       wfMsg( 'viewsourcefor', $this->getSkin()->linkKnown( $this->getTitle() ) )
                                );
                        } else {
                                $this->setPageTitle( wfMsg( 'badaccess' ) );
@@ -1991,9 +2120,7 @@ class OutputPage {
                        $this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );
                } else {
                        // Wiki is read only
-                       $this->setPageTitle( wfMsg( 'readonly' ) );
-                       $reason = wfReadOnlyReason();
-                       $this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );
+                       throw new ReadOnlyError;
                }
 
                // Show source, if supplied
@@ -2003,14 +2130,14 @@ class OutputPage {
                        $params = array(
                                'id'   => 'wpTextbox1',
                                'name' => 'wpTextbox1',
-                               'cols' => $wgUser->getOption( 'cols' ),
-                               'rows' => $wgUser->getOption( 'rows' ),
+                               'cols' => $this->getUser()->getOption( 'cols' ),
+                               'rows' => $this->getUser()->getOption( 'rows' ),
                                'readonly' => 'readonly'
                        );
                        $this->addHTML( Html::element( 'textarea', $params, $source ) );
 
                        // Show templates used by this article
-                       $skin = $wgUser->getSkin();
+                       $skin = $this->getSkin();
                        $article = new Article( $this->getTitle() );
                        $this->addHTML( "<div class='templatesUsed'>
 {$skin->formatTemplates( $article->getUsedTemplates() )}
@@ -2027,71 +2154,31 @@ class OutputPage {
        }
 
        /**
-        * Adds JS-based password security checker
-        * @param $passwordId String ID of input box containing password
-        * @param $retypeId String ID of input box containing retyped password
-        * @return none
+        * Turn off regular page output and return an error reponse
+        * for when rate limiting has triggered.
         */
-       public function addPasswordSecurity( $passwordId, $retypeId ) {
-               $data = array(
-                       'password' => '#' . $passwordId,
-                       'retype' => '#' . $retypeId,
-                       'messages' => array(),
-               );
-               foreach ( array( 'password-strength', 'password-strength-bad', 'password-strength-mediocre',
-                               'password-strength-acceptable', 'password-strength-good', 'password-retype', 'password-retype-mismatch'
-                       ) as $message ) {
-                       $data['messages'][$message] = wfMsg( $message );
-               }
-               $this->addScript( Html::inlineScript( 'var passwordSecurity=' . FormatJson::encode( $data ) ) );
-               $this->addModules( 'mediawiki.legacy.password' );
-       }
-
-       /** @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__ );
-               throw new FatalError( $message );
-       }
-
-       /** @deprecated */
-       public function unexpectedValueError( $name, $val ) {
-               wfDeprecated( __METHOD__ );
-               throw new FatalError( wfMsg( 'unexpected', $name, $val ) );
-       }
-
-       /** @deprecated */
-       public function fileCopyError( $old, $new ) {
-               wfDeprecated( __METHOD__ );
-               throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );
-       }
-
-       /** @deprecated */
-       public function fileRenameError( $old, $new ) {
-               wfDeprecated( __METHOD__ );
-               throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );
-       }
-
-       /** @deprecated */
-       public function fileDeleteError( $name ) {
-               wfDeprecated( __METHOD__ );
-               throw new FatalError( wfMsg( 'filedeleteerror', $name ) );
+       public function rateLimited() {
+               throw new ThrottledError;
        }
 
-       /** @deprecated */
-       public function fileNotFoundError( $name ) {
-               wfDeprecated( __METHOD__ );
-               throw new FatalError( wfMsg( 'filenotfound', $name ) );
+       /**
+        * Show a warning about slave lag
+        *
+        * If the lag is higher than $wgSlaveLagCritical seconds,
+        * then the warning is a bit more obvious. If the lag is
+        * lower than $wgSlaveLagWarning, then no warning is shown.
+        *
+        * @param $lag Integer: slave lag
+        */
+       public function showLagWarning( $lag ) {
+               global $wgSlaveLagWarning, $wgSlaveLagCritical;
+               if( $lag >= $wgSlaveLagWarning ) {
+                       $message = $lag < $wgSlaveLagCritical
+                               ? 'lag-warn-normal'
+                               : 'lag-warn-high';
+                       $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
+                       $this->wrapWikiMsg( "$wrap\n", array( $message, $this->getContext()->getLang()->formatNum( $lag ) ) );
+               }
        }
 
        public function showFatalError( $message ) {
@@ -2131,11 +2218,10 @@ class OutputPage {
         * @param $text String text of the link (input is not escaped)
         */
        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, $text, array(), $query )
+                       $this->getSkin()->link( $title, $text, array(), $query )
                );
                $this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );
        }
@@ -2149,14 +2235,12 @@ class OutputPage {
         * @param $returntoquery String: query string for the return to link
         */
        public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {
-               global $wgRequest;
-
                if ( $returnto == null ) {
-                       $returnto = $wgRequest->getText( 'returnto' );
+                       $returnto = $this->getRequest()->getText( 'returnto' );
                }
 
                if ( $returntoquery == null ) {
-                       $returntoquery = $wgRequest->getText( 'returntoquery' );
+                       $returntoquery = $this->getRequest()->getText( 'returntoquery' );
                }
 
                if ( $returnto === '' ) {
@@ -2181,16 +2265,15 @@ class OutputPage {
         * @return String: The doctype, opening <html>, and head element.
         */
        public function headElement( Skin $sk, $includeStyle = true ) {
-               global $wgOutputEncoding, $wgMimeType;
-               global $wgUseTrackbacks, $wgHtml5;
-               global $wgUser, $wgRequest, $wgLang;
+               global $wgUseTrackbacks;
 
                if ( $sk->commonPrintStylesheet() ) {
                        $this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );
                }
                $sk->setupUserCss( $this );
 
-               $ret = Html::htmlHeader( array( 'lang' => wfUILang()->getCode() ) );
+               $lang = wfUILang();
+               $ret = Html::htmlHeader( array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() ) );
 
                if ( $this->getHTMLTitle() == '' ) {
                        $this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );
@@ -2202,24 +2285,14 @@ class OutputPage {
                        $ret .= "$openHead\n";
                }
 
-               if ( $wgHtml5 ) {
-                       # More succinct than <meta http-equiv=Content-Type>, has the
-                       # same effect
-                       $ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";
-               } else {
-                       $this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );
-               }
-
                $ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";
 
                $ret .= implode( "\n", array(
-                       $this->getHeadLinks(),
+                       $this->getHeadLinks( $sk, true ),
                        $this->buildCssLinks( $sk ),
-                       $this->getHeadItems(),
+                       $this->getHeadScripts( $sk ),
+                       $this->getHeadItems()
                ) );
-               if ( $sk->usercss ) {
-                       $ret .= Html::inlineStyle( $sk->usercss );
-               }
 
                if ( $wgUseTrackbacks && $this->isArticleRelated() ) {
                        $ret .= $this->getTitle()->trackbackRDF();
@@ -2233,35 +2306,29 @@ class OutputPage {
                $bodyAttrs = array();
 
                # Crazy edit-on-double-click stuff
-               $action = $wgRequest->getVal( 'action', 'view' );
+               $action = $this->getRequest()->getVal( 'action', 'view' );
 
                if (
                        $this->getTitle()->getNamespace() != NS_SPECIAL &&
-                       !in_array( $action, array( 'edit', 'submit' ) ) &&
-                       $wgUser->getOption( 'editondblclick' )
+                       in_array( $action, array( 'view', 'purge' ) ) &&
+                       $this->getUser()->getOption( 'editondblclick' )
                )
                {
-                       $bodyAttrs['ondblclick'] = "document.location = '" . Xml::escapeJsString( $this->getTitle()->getEditURL() ) . "'";
+                       $editUrl = $this->getTitle()->getLocalUrl( $sk->editUrlOptions() );
+                       $bodyAttrs['ondblclick'] = "document.location = '" .
+                               Xml::escapeJsString( $editUrl ) . "'";
                }
 
                # Class bloat
                $dir = wfUILang()->getDir();
                $bodyAttrs['class'] = "mediawiki $dir";
 
-               if ( $wgLang->capitalizeAllNouns() ) {
+               if ( $this->getContext()->getLang()->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() );
+               $bodyAttrs['class'] .= ' ' . $sk->getPageClasses( $this->getTitle() );
+               $bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $sk->getSkinName() );
 
                $sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need
                wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );
@@ -2271,47 +2338,89 @@ class OutputPage {
                return $ret;
        }
 
+       /**
+        * Add the default ResourceLoader modules to this object
+        */
+       private function addDefaultModules() {
+               global $wgIncludeLegacyJavaScript,
+                       $wgUseAjax, $wgAjaxWatch, $wgEnableMWSuggest;
+
+               // Add base resources
+               $this->addModules( 'mediawiki.util' );
+               if( $wgIncludeLegacyJavaScript ){
+                       $this->addModules( 'mediawiki.legacy.wikibits' );
+               }
+
+               // Add various resources if required
+               if ( $wgUseAjax ) {
+                       $this->addModules( 'mediawiki.legacy.ajax' );
+
+                       wfRunHooks( 'AjaxAddScript', array( &$this ) );
+
+                       if( $wgAjaxWatch && $this->getUser()->isLoggedIn() ) {
+                               $this->addModules( 'mediawiki.action.watch.ajax' );
+                       }
+
+                       if ( $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
+                               $this->addModules( 'mediawiki.legacy.mwsuggest' );
+                       }
+               }
+
+               if( $this->getUser()->getBoolOption( 'editsectiononrightclick' ) ) {
+                       $this->addModules( 'mediawiki.action.view.rightClickEdit' );
+               }
+       }
+
        /**
         * Get a ResourceLoader object associated with this OutputPage
+        *
+        * @return ResourceLoader
         */
        public function getResourceLoader() {
                if ( is_null( $this->mResourceLoader ) ) {
                        $this->mResourceLoader = new ResourceLoader();
                }
                return $this->mResourceLoader;
-       }               
+       }
 
        /**
         * TODO: Document
         * @param $skin Skin
         * @param $modules Array/string with the module name
-        * @param $only string May be styles, messages or scripts
+        * @param $only String ResourceLoaderModule TYPE_ class constant
         * @param $useESI boolean
         * @return string html <script> and <style> tags
         */
        protected function makeResourceLoaderLink( Skin $skin, $modules, $only, $useESI = false ) {
-               global $wgUser, $wgLang, $wgLoadScript, $wgResourceLoaderUseESI,
+               global $wgLoadScript, $wgResourceLoaderUseESI,
                        $wgResourceLoaderInlinePrivateModules;
                // Lazy-load ResourceLoader
                // TODO: Should this be a static function of ResourceLoader instead?
                // TODO: Divide off modules starting with "user", and add the user parameter to them
-               $query = array(
-                       'lang' => $wgLang->getCode(),
+               $baseQuery = array(
+                       'lang' => $this->getContext()->getLang()->getCode(),
                        'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',
                        'skin' => $skin->getSkinName(),
                        'only' => $only,
                );
-               
+               // Propagate printable and handheld parameters if present
+               if ( $this->isPrintable() ) {
+                       $baseQuery['printable'] = 1;
+               }
+               if ( $this->getRequest()->getBool( 'handheld' ) ) {
+                       $baseQuery['handheld'] = 1;
+               }
+
                if ( !count( $modules ) ) {
                        return '';
                }
-               
+
                if ( count( $modules ) > 1 ) {
                        // Remove duplicate module requests
                        $modules = array_unique( (array) $modules );
                        // Sort module names so requests are more uniform
                        sort( $modules );
-               
+
                        if ( ResourceLoader::inDebugMode() ) {
                                // Recursively call us for every item
                                $links = '';
@@ -2321,29 +2430,56 @@ class OutputPage {
                                return $links;
                        }
                }
-               
+
                // Create keyed-by-group list of module objects from modules list
                $groups = array();
                $resourceLoader = $this->getResourceLoader();
                foreach ( (array) $modules as $name ) {
                        $module = $resourceLoader->getModule( $name );
+                       # Check that we're allowed to include this module on this page
+                       if ( ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_SCRIPTS )
+                                       && $only == ResourceLoaderModule::TYPE_SCRIPTS )
+                               || ( $module->getOrigin() > $this->getAllowedModules( ResourceLoaderModule::TYPE_STYLES )
+                                       && $only == ResourceLoaderModule::TYPE_STYLES )
+                               )
+                       {
+                               continue;
+                       }
+
                        $group = $module->getGroup();
                        if ( !isset( $groups[$group] ) ) {
                                $groups[$group] = array();
                        }
                        $groups[$group][$name] = $module;
                }
+
                $links = '';
                foreach ( $groups as $group => $modules ) {
-                       $query['modules'] = implode( '|', array_keys( $modules ) );
+                       $query = $baseQuery;
                        // Special handling for user-specific groups
-                       if ( ( $group === 'user' || $group === 'private' ) && $wgUser->isLoggedIn() ) {
-                               $query['user'] = $wgUser->getName();
+                       if ( ( $group === 'user' || $group === 'private' ) && $this->getUser()->isLoggedIn() ) {
+                               $query['user'] = $this->getUser()->getName();
                        }
+
+                       // Create a fake request based on the one we are about to make so modules return
+                       // correct timestamp and emptiness data
+                       $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
+                       // Drop modules that know they're empty
+                       foreach ( $modules as $key => $module ) {
+                               if ( $module->isKnownEmpty( $context ) ) {
+                                       unset( $modules[$key] );
+                               }
+                       }
+                       // If there are no modules left, skip this group
+                       if ( $modules === array() ) {
+                               continue;
+                       }
+
+                       $query['modules'] = implode( '|', array_keys( $modules ) );
+
                        // Support inlining of private modules if configured as such
                        if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {
-                               $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
-                               if ( $only == 'styles' ) {
+                               if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
                                        $links .= Html::inlineStyle(
                                                $resourceLoader->makeModuleResponse( $context, $modules )
                                        );
@@ -2356,20 +2492,19 @@ class OutputPage {
                                }
                                continue;
                        }
-                       // Special handling for user and site groups; because users might change their stuff
-                       // on-wiki like site or user pages, or user preferences; we need to find the highest
+                       // Special handling for the user group; because users might change their stuff
+                       // on-wiki like user pages, or user preferences; we need to find the highest
                        // timestamp of these user-changable modules so we can ensure cache misses on change
-                       if ( $group === 'user' || $group === 'site' ) {
-                               // Create a fake request based on the one we are about to make so modules return
-                               // correct times
-                               $context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );
+                       // This should NOT be done for the site group (bug 27564) because anons get that too
+                       // and we shouldn't be putting timestamps in Squid-cached HTML
+                       if ( $group === 'user' ) {
                                // Get the maximum timestamp
                                $timestamp = 1;
                                foreach ( $modules as $module ) {
                                        $timestamp = max( $timestamp, $module->getModifiedTime( $context ) );
                                }
                                // Add a version parameter so cache will break when things change
-                               $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, round( $timestamp, -2 ) );
+                               $query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );
                        }
                        // Make queries uniform in order
                        ksort( $query );
@@ -2377,107 +2512,217 @@ class OutputPage {
                        $url = wfAppendQuery( $wgLoadScript, $query );
                        if ( $useESI && $wgResourceLoaderUseESI ) {
                                $esi = Xml::element( 'esi:include', array( 'src' => $url ) );
-                               if ( $only == 'styles' ) {
-                                       $links .= Html::inlineStyle( $esi );
+                               if ( $only == ResourceLoaderModule::TYPE_STYLES ) {
+                                       $link = Html::inlineStyle( $esi );
                                } else {
-                                       $links .= Html::inlineScript( $esi );
+                                       $link = Html::inlineScript( $esi );
                                }
                        } else {
                                // Automatically select style/script elements
-                               if ( $only === 'styles' ) {
-                                       $links .= Html::linkedStyle( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
+                               if ( $only === ResourceLoaderModule::TYPE_STYLES ) {
+                                       $link = Html::linkedStyle( wfAppendQuery( $wgLoadScript, $query ) );
                                } else {
-                                       $links .= Html::linkedScript( wfAppendQuery( $wgLoadScript, $query ) ) . "\n";
+                                       $link = Html::linkedScript( wfAppendQuery( $wgLoadScript, $query ) );
                                }
                        }
+
+                       if( $group == 'noscript' ){
+                               $links .= Html::rawElement( 'noscript', array(), $link ) . "\n";
+                       } else {
+                               $links .= $link . "\n";
+                       }
                }
                return $links;
        }
 
        /**
-        * Gets the global variables and mScripts; also adds userjs to the end if
-        * enabled. Despite the name, these scripts are no longer put in the
-        * <head> but at the bottom of the <body>
+        * JS stuff to put in the <head>. This is the startup module, config
+        * vars and modules marked with position 'top'
         *
         * @param $sk Skin object to use
         * @return String: HTML fragment
         */
        function getHeadScripts( Skin $sk ) {
-               global $wgUser, $wgRequest, $wgUseSiteJs;
-
                // Startup - this will immediately load jquery and mediawiki modules
-               $scripts = $this->makeResourceLoaderLink( $sk, 'startup', 'scripts', true );
+               $scripts = $this->makeResourceLoaderLink( $sk, 'startup', ResourceLoaderModule::TYPE_SCRIPTS, true );
+
+               // Load config before anything else
+               $scripts .= Html::inlineScript(
+                       ResourceLoader::makeLoaderConditionalScript(
+                               ResourceLoader::makeConfigSetScript( $this->getJSVars() )
+                       )
+               );
+
+               // Script and Messages "only" requests marked for top inclusion
+               // Messages should go first
+               $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages( true, 'top' ), ResourceLoaderModule::TYPE_MESSAGES );
+               $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts( true, 'top' ), ResourceLoaderModule::TYPE_SCRIPTS );
+
+               // Modules requests - let the client calculate dependencies and batch requests as it likes
+               // Only load modules that have marked themselves for loading at the top
+               $modules = $this->getModules( true, 'top' );
+               if ( $modules ) {
+                       $scripts .= Html::inlineScript(
+                               ResourceLoader::makeLoaderConditionalScript(
+                                       Xml::encodeJsCall( 'mw.loader.load', array( $modules ) ) .
+                                       Xml::encodeJsCall( 'mw.loader.go', array() )
+                               )
+                       );
+               }
 
-               // Configuration -- This could be merged together with the load and go, but
-               // makeGlobalVariablesScript returns a whole script tag -- grumble grumble...
-               $scripts .= Skin::makeGlobalVariablesScript( $sk->getSkinName() ) . "\n";
+               return $scripts;
+       }
+
+       /**
+        * JS stuff to put at the bottom of the <body>: modules marked with position 'bottom',
+        * legacy scripts ($this->mScripts), user preferences, site JS and user JS
+        */
+       function getBottomScripts( Skin $sk ) {
+               global $wgUseSiteJs, $wgAllowUserJs;
 
-               // Script and Messages "only" requests
-               $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts(), 'scripts' );
-               $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages(), 'messages' );
+               // Script and Messages "only" requests marked for bottom inclusion
+               // Messages should go first
+               $scripts = $this->makeResourceLoaderLink( $sk, $this->getModuleMessages( true, 'bottom' ), ResourceLoaderModule::TYPE_MESSAGES );
+               $scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts( true, 'bottom' ), ResourceLoaderModule::TYPE_SCRIPTS );
 
                // Modules requests - let the client calculate dependencies and batch requests as it likes
-               if ( $this->getModules() ) {
+               // Only load modules that have marked themselves for loading at the bottom
+               $modules = $this->getModules( true, 'bottom' );
+               if ( $modules ) {
                        $scripts .= Html::inlineScript(
                                ResourceLoader::makeLoaderConditionalScript(
-                                       Xml::encodeJsCall( 'mediaWiki.loader.load', array( $this->getModules() ) ) .
-                                       Xml::encodeJsCall( 'mediaWiki.loader.go', array() )
+                                       Xml::encodeJsCall( 'mw.loader.load', array( $modules ) ) .
+                                       // the go() call is unnecessary if we inserted top modules, but we don't know for sure that we did
+                                       Xml::encodeJsCall( 'mw.loader.go', array() )
                                )
-                       ) . "\n";
+                       );
                }
 
                // Legacy Scripts
                $scripts .= "\n" . $this->mScripts;
 
+               $userScripts = array( 'user.options' );
+
                // Add site JS if enabled
                if ( $wgUseSiteJs ) {
-                       $scripts .= $this->makeResourceLoaderLink( $sk, 'site', 'scripts' );
+                       $scripts .= $this->makeResourceLoaderLink( $sk, 'site', ResourceLoaderModule::TYPE_SCRIPTS );
+                       if( $this->getUser()->isLoggedIn() ){
+                               $userScripts[] = 'user.groups';
+                       }
                }
 
-               // Add user JS if enabled - trying to load user.options as a bundle if possible
-               $userOptionsAdded = false;
-               if ( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {
-                       $action = $wgRequest->getVal( 'action', 'view' );
-                       if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {
+               // Add user JS if enabled
+               if ( $wgAllowUserJs && $this->getUser()->isLoggedIn() ) {
+                       $action = $this->getRequest()->getVal( 'action', 'view' );
+                       if( $this->getTitle() && $this->getTitle()->isJsSubpage() && $sk->userCanPreview( $action ) ) {
                                # XXX: additional security check/prompt?
-                               $scripts .= Html::inlineScript( "\n" . $wgRequest->getText( 'wpTextbox1' ) . "\n" ) . "\n";
+                               $scripts .= Html::inlineScript( "\n" . $this->getRequest()->getText( 'wpTextbox1' ) . "\n" ) . "\n";
                        } else {
-                               $scripts .= $this->makeResourceLoaderLink(
-                                       $sk, array( 'user', 'user.options' ), 'scripts'
-                               );
-                               $userOptionsAdded = true;
+                               # FIXME: this means that User:Me/Common.js doesn't load when previewing
+                               # User:Me/Vector.js, and vice versa (bug26283)
+                               $userScripts[] = 'user';
                        }
                }
-               if ( !$userOptionsAdded ) {
-                       $scripts .= $this->makeResourceLoaderLink( $sk, 'user.options', 'scripts' );
-               }
-               
+               $scripts .= $this->makeResourceLoaderLink( $sk, $userScripts, ResourceLoaderModule::TYPE_SCRIPTS );
+
                return $scripts;
        }
 
        /**
-        * Add default \<meta\> tags
+        * Get an array containing global JS variables
+        *
+        * Do not add things here which can be evaluated in
+        * ResourceLoaderStartupScript - in other words, without state.
+        * You will only be adding bloat to the page and causing page caches to
+        * have to be purged on configuration changes.
         */
-       protected function addDefaultMeta() {
-               global $wgVersion, $wgHtml5;
+       protected function getJSVars() {
+               global $wgUseAjax, $wgEnableMWSuggest, $wgContLang;
 
-               static $called = false;
-               if ( $called ) {
-                       # Don't run this twice
-                       return;
+               $title = $this->getTitle();
+               $ns = $title->getNamespace();
+               $nsname = MWNamespace::exists( $ns ) ? MWNamespace::getCanonicalName( $ns ) : $title->getNsText();
+               if ( $ns == NS_SPECIAL ) {
+                       list( $canonicalName, /*...*/ ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
+               } else {
+                       $canonicalName = false; # bug 21115
+               }
+
+               $vars = array(
+                       'wgCanonicalNamespace' => $nsname,
+                       'wgCanonicalSpecialPageName' => $canonicalName,
+                       'wgNamespaceNumber' => $title->getNamespace(),
+                       'wgPageName' => $title->getPrefixedDBKey(),
+                       'wgTitle' => $title->getText(),
+                       'wgCurRevisionId' => $title->getLatestRevID(),
+                       'wgArticleId' => $title->getArticleId(),
+                       'wgIsArticle' => $this->isArticle(),
+                       'wgAction' => $this->getRequest()->getText( 'action', 'view' ),
+                       'wgUserName' => $this->getUser()->isAnon() ? null : $this->getUser()->getName(),
+                       'wgUserGroups' => $this->getUser()->getEffectiveGroups(),
+                       'wgCategories' => $this->getCategories(),
+                       'wgBreakFrames' => $this->getFrameOptions() == 'DENY',
+                       'wgIsMainPage' => $title->isMainPage(),
+               );
+               if ( $wgContLang->hasVariants() ) {
+                       $vars['wgUserVariant'] = $wgContLang->getPreferredVariant();
                }
-               $called = true;
+               foreach ( $title->getRestrictionTypes() as $type ) {
+                       $vars['wgRestriction' . ucfirst( $type )] = $title->getRestrictions( $type );
+               }
+               if ( $wgUseAjax && $wgEnableMWSuggest && !$this->getUser()->getOption( 'disablesuggest', false ) ) {
+                       $vars['wgSearchNamespaces'] = SearchEngine::userNamespaces( $this->getUser() );
+               }
+
+               // Allow extensions to add their custom variables to the global JS variables
+               wfRunHooks( 'MakeGlobalVariablesScript', array( &$vars ) );
+
+               return $vars;
+       }
+
+       /**
+        * @return string HTML tag links to be put in the header.
+        */
+       public function getHeadLinks( Skin $sk, $addContentType = false ) {
+               global $wgUniversalEditButton, $wgFavicon, $wgAppleTouchIcon, $wgEnableAPI,
+                       $wgSitename, $wgVersion, $wgHtml5, $wgMimeType, $wgOutputEncoding,
+                       $wgFeed, $wgOverrideSiteFeed, $wgAdvertisedFeedTypes,
+                       $wgEnableDublinCoreRdf, $wgEnableCreativeCommonsRdf,
+                       $wgDisableLangConversion, $wgCanonicalLanguageLinks, $wgContLang,
+                       $wgRightsPage, $wgRightsUrl;
+
+               $tags = array();
 
-               if ( !$wgHtml5 ) {
-                       $this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835
+               if ( $addContentType ) {
+                       if ( $wgHtml5 ) {
+                               # More succinct than <meta http-equiv=Content-Type>, has the
+                               # same effect
+                               $tags[] = Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) );
+                       } else {
+                               $tags[] = Html::element( 'meta', array(
+                                       'http-equiv' => 'Content-Type',
+                                       'content' => "$wgMimeType; charset=$wgOutputEncoding"
+                               ) );
+                               $tags[] = Html::element( 'meta', array(  // bug 15835
+                                       'http-equiv' => 'Content-Style-Type',
+                                       'content' => 'text/css'
+                               ) );
+                       }
                }
-               $this->addMeta( 'generator', "MediaWiki $wgVersion" );
+
+               $tags[] = Html::element( 'meta', array(
+                       'name' => 'generator',
+                       'content' => "MediaWiki $wgVersion",
+               ) );
 
                $p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
                if( $p !== 'index,follow' ) {
                        // http://www.robotstxt.org/wc/meta-user.html
                        // Only show if it's different from the default robots policy
-                       $this->addMeta( 'robots', $p );
+                       $tags[] = Html::element( 'meta', array(
+                               'name' => 'robots',
+                               'content' => $p,
+                       ) );
                }
 
                if ( count( $this->mKeywords ) > 0 ) {
@@ -2485,27 +2730,15 @@ class OutputPage {
                                "/<.*?" . ">/" => '',
                                "/_/" => ' '
                        );
-                       $this->addMeta(
-                               'keywords',
-                               preg_replace(
+                       $tags[] = Html::element( 'meta', array(
+                               'name' => 'keywords',
+                               'content' =>  preg_replace(
                                        array_keys( $strip ),
                                        array_values( $strip ),
                                        implode( ',', $this->mKeywords )
                                )
-                       );
+                       ) );
                }
-       }
-
-       /**
-        * @return string HTML tag links to be put in the header.
-        */
-       public function getHeadLinks() {
-               global $wgFeed;
-
-               // Ideally this should happen earlier, somewhere. :P
-               $this->addDefaultMeta();
-
-               $tags = array();
 
                foreach ( $this->mMetatags as $tag ) {
                        if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
@@ -2521,11 +2754,137 @@ class OutputPage {
                                )
                        );
                }
+
                foreach ( $this->mLinktags as $tag ) {
                        $tags[] = Html::element( 'link', $tag );
                }
 
-               if( $wgFeed ) {
+               # Universal edit button
+               if ( $wgUniversalEditButton ) {
+                       if ( $this->isArticleRelated() && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )
+                               && ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {
+                               // Original UniversalEditButton
+                               $msg = wfMsg( 'edit' );
+                               $tags[] = Html::element( 'link', array(
+                                       'rel' => 'alternate',
+                                       'type' => 'application/x-wiki',
+                                       'title' => $msg,
+                                       'href' => $this->getTitle()->getLocalURL( 'action=edit' )
+                               ) );
+                               // Alternate edit link
+                               $tags[] = Html::element( 'link', array(
+                                       'rel' => 'edit',
+                                       'title' => $msg,
+                                       'href' => $this->getTitle()->getLocalURL( 'action=edit' )
+                               ) );
+                       }
+               }
+
+               # Generally the order of the favicon and apple-touch-icon links
+               # should not matter, but Konqueror (3.5.9 at least) incorrectly
+               # uses whichever one appears later in the HTML source. Make sure
+               # apple-touch-icon is specified first to avoid this.
+               if ( $wgAppleTouchIcon !== false ) {
+                       $tags[] = Html::element( 'link', array( 'rel' => 'apple-touch-icon', 'href' => $wgAppleTouchIcon ) );
+               }
+
+               if ( $wgFavicon !== false ) {
+                       $tags[] = Html::element( 'link', array( 'rel' => 'shortcut icon', 'href' => $wgFavicon ) );
+               }
+
+               # OpenSearch description link
+               $tags[] = Html::element( 'link', array(
+                       'rel' => 'search',
+                       'type' => 'application/opensearchdescription+xml',
+                       'href' => wfScript( 'opensearch_desc' ),
+                       'title' => wfMsgForContent( 'opensearch-desc' ),
+               ) );
+
+               if ( $wgEnableAPI ) {
+                       # Real Simple Discovery link, provides auto-discovery information
+                       # for the MediaWiki API (and potentially additional custom API
+                       # support such as WordPress or Twitter-compatible APIs for a
+                       # blogging extension, etc)
+                       $tags[] = Html::element( 'link', array(
+                               'rel' => 'EditURI',
+                               'type' => 'application/rsd+xml',
+                               'href' => wfExpandUrl( wfAppendQuery( wfScript( 'api' ), array( 'action' => 'rsd' ) ) ),
+                       ) );
+               }
+
+               # Metadata links
+               # - Creative Commons
+               #   See http://wiki.creativecommons.org/Extend_Metadata.
+               # - Dublin Core
+               #   Use hreflang to specify canonical and alternate links
+               #   See http://www.google.com/support/webmasters/bin/answer.py?answer=189077
+               if ( $this->isArticleRelated() ) {
+                       # note: buggy CC software only reads first "meta" link
+                       if ( $wgEnableCreativeCommonsRdf ) {
+                               $tags[] = Html::element( 'link', array(
+                                       'rel' => $this->getMetadataAttribute(),
+                                       'title' => 'Creative Commons',
+                                       'type' => 'application/rdf+xml',
+                                       'href' => $this->getTitle()->getLocalURL( 'action=creativecommons' ) )
+                               );
+                       }
+
+                       if ( $wgEnableDublinCoreRdf ) {
+                               $tags[] = Html::element( 'link', array(
+                                       'rel' => $this->getMetadataAttribute(),
+                                       'title' => 'Dublin Core',
+                                       'type' => 'application/rdf+xml',
+                                       'href' => $this->getTitle()->getLocalURL( 'action=dublincore' ) )
+                               );
+                       }
+               }
+
+               # Language variants
+               if ( !$wgDisableLangConversion && $wgCanonicalLanguageLinks
+                       && $wgContLang->hasVariants() ) {
+
+                       $urlvar = $wgContLang->getURLVariant();
+
+                       if ( !$urlvar ) {
+                               $variants = $wgContLang->getVariants();
+                               foreach ( $variants as $_v ) {
+                                       $tags[] = Html::element( 'link', array(
+                                               'rel' => 'alternate',
+                                               'hreflang' => $_v,
+                                               'href' => $this->getTitle()->getLocalURL( '', $_v ) )
+                                       );
+                               }
+                       } else {
+                               $tags[] = Html::element( 'link', array(
+                                       'rel' => 'canonical',
+                                       'href' => $this->getTitle()->getFullURL() )
+                               );
+                       }
+               }
+
+               # Copyright
+               $copyright = '';
+               if ( $wgRightsPage ) {
+                       $copy = Title::newFromText( $wgRightsPage );
+
+                       if ( $copy ) {
+                               $copyright = $copy->getLocalURL();
+                       }
+               }
+
+               if ( !$copyright && $wgRightsUrl ) {
+                       $copyright = $wgRightsUrl;
+               }
+
+               if ( $copyright ) {
+                       $tags[] = Html::element( 'link', array(
+                               'rel' => 'copyright',
+                               'href' => $copyright )
+                       );
+               }
+
+               # Feeds
+               if ( $wgFeed ) {
                        foreach( $this->getSyndicationLinks() as $format => $link ) {
                                # Use the page name for the title (accessed through $wgTitle since
                                # there's no other way).  In principle, this could lead to issues
@@ -2548,7 +2907,6 @@ class OutputPage {
                        # or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.
                        # If so, use it instead.
 
-                       global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;
                        $rctitle = SpecialPage::getTitleFor( 'Recentchanges' );
 
                        if ( $wgOverrideSiteFeed ) {
@@ -2569,7 +2927,6 @@ class OutputPage {
                                }
                        }
                }
-
                return implode( "\n", $tags );
        }
 
@@ -2620,30 +2977,47 @@ class OutputPage {
         * @param $style_css Mixed: inline CSS
         */
        public function addInlineStyle( $style_css ){
-               $this->mScripts .= Html::inlineStyle( $style_css );
+               $this->mInlineStyles .= Html::inlineStyle( $style_css );
        }
 
        /**
         * Build a set of <link>s for the stylesheets specified in the $this->styles array.
         * These will be applied to various media & IE conditionals.
+        * @param $sk Skin object
         */
        public function buildCssLinks( $sk ) {
-               // Split the styles into three groups
-               $styles = array( 'other' => array(), 'user' => array(), 'site' => array() );
+               $ret = '';
+               // Add ResourceLoader styles
+               // Split the styles into four groups
+               $styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array(), 'noscript' => array() );
                $resourceLoader = $this->getResourceLoader();
                foreach ( $this->getModuleStyles() as $name ) {
                        $group = $resourceLoader->getModule( $name )->getGroup();
-                       // Modules in groups named "other" or anything different than "user" or "site" will
-                       // be placed in the "other" group
+                       // Modules in groups named "other" or anything different than "user", "site" or "private"
+                       // will be placed in the "other" group
                        $styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;
                }
-               // Add tags created using legacy methods
-               $tags = $this->buildCssLinksArray();
-               // Add ResourceLoader module style tags
-               $tags[] = $this->makeResourceLoaderLink(
-                       $sk, array_merge( $styles['other'], $styles['site'], $styles['user'] ), 'styles'
-               );
-               return implode( "\n", $tags );
+
+               // We want site, private and user styles to override dynamically added styles from modules, but we want
+               // dynamically added styles to override statically added styles from other modules. So the order
+               // has to be other, dynamic, site, private, user
+               // Add statically added styles for other modules
+               $ret .= $this->makeResourceLoaderLink( $sk, $styles['other'], ResourceLoaderModule::TYPE_STYLES );
+               // Add normal styles added through addStyle()/addInlineStyle() here
+               $ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;
+               // Add marker tag to mark the place where the client-side loader should inject dynamic styles
+               // We use a <meta> tag with a made-up name for this because that's valid HTML
+               $ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) ) . "\n";
+
+               // Add site, private and user styles
+               // 'private' at present only contains user.options, so put that before 'user'
+               // Any future private modules will likely have a similar user-specific character
+               foreach ( array( 'site', 'noscript', 'private', 'user' ) as $group ) {
+                       $ret .= $this->makeResourceLoaderLink( $sk, $styles[$group],
+                                       ResourceLoaderModule::TYPE_STYLES
+                       );
+               }
+               return $ret;
        }
 
        public function buildCssLinksArray() {
@@ -2674,7 +3048,7 @@ class OutputPage {
                }
 
                if( isset( $options['media'] ) ) {
-                       $media = $this->transformCssMedia( $options['media'] );
+                       $media = self::transformCssMedia( $options['media'] );
                        if( is_null( $media ) ) {
                                return '';
                        }
@@ -2706,7 +3080,7 @@ class OutputPage {
         * @param $media String: current value of the "media" attribute
         * @return String: modified value of the "media" attribute
         */
-       function transformCssMedia( $media ) {
+       public static function transformCssMedia( $media ) {
                global $wgRequest, $wgHandheldForIPhone;
 
                // Switch in on-screen display for media testing
@@ -2739,43 +3113,6 @@ class OutputPage {
                return $media;
        }
 
-       /**
-        * Turn off regular page output and return an error reponse
-        * for when rate limiting has triggered.
-        */
-       public function rateLimited() {
-               $this->setPageTitle( wfMsg( 'actionthrottled' ) );
-               $this->setRobotPolicy( 'noindex,follow' );
-               $this->setArticleRelated( false );
-               $this->enableClientCache( false );
-               $this->mRedirect = '';
-               $this->clearHTML();
-               $this->setStatusCode( 503 );
-               $this->addWikiMsg( 'actionthrottledtext' );
-
-               $this->returnToMain( null, $this->getTitle() );
-       }
-
-       /**
-        * Show a warning about slave lag
-        *
-        * If the lag is higher than $wgSlaveLagCritical seconds,
-        * then the warning is a bit more obvious. If the lag is
-        * lower than $wgSlaveLagWarning, then no warning is shown.
-        *
-        * @param $lag Integer: slave lag
-        */
-       public function showLagWarning( $lag ) {
-               global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;
-               if( $lag >= $wgSlaveLagWarning ) {
-                       $message = $lag < $wgSlaveLagCritical
-                               ? 'lag-warn-normal'
-                               : 'lag-warn-high';
-                       $wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );
-                       $this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );
-               }
-       }
-
        /**
         * Add a wikitext-formatted message to the output.
         * This is equivalent to:
@@ -2845,7 +3182,7 @@ class OutputPage {
                        }
                        $s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );
                }
-               $this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );
+               $this->addWikiText( $s );
        }
 
        /**
@@ -2855,7 +3192,7 @@ class OutputPage {
         * @param $modules Array: list of jQuery modules which should be loaded
         * @return Array: the list of modules which were not loaded.
         * @since 1.16
-        * @deprecated No longer needed as of 1.17
+        * @deprecated since 1.17
         */
        public function includeJQuery( $modules = array() ) {
                return array();