merged master
[lhc/web/wiklou.git] / includes / Article.php
index 9fccdf6..c7d350a 100644 (file)
@@ -1,6 +1,22 @@
 <?php
 /**
- * File for articles
+ * User interface for page actions.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
  * @file
  */
 
@@ -9,7 +25,7 @@
  *
  * This maintains WikiPage functions for backwards compatibility.
  *
- * @TODO: move and rewrite code to an Action class
+ * @todo move and rewrite code to an Action class
  *
  * See design.txt for an overview.
  * Note: edit user interface and cache support functions have been
@@ -23,43 +39,76 @@ class Article extends Page {
         */
 
        /**
-        * @var IContextSource
+        * The context this Article is executed in
+        * @var IContextSource $mContext
         */
        protected $mContext;
 
        /**
-        * @var WikiPage
+        * The WikiPage object of this instance
+        * @var WikiPage $mPage
         */
        protected $mPage;
 
        /**
-        * @var ParserOptions: ParserOptions object for $wgUser articles
+        * ParserOptions object for $wgUser articles
+        * @var ParserOptions $mParserOptions
         */
        public $mParserOptions;
 
+       /**
+        * Text of the revision we are working on
+        * @var string $mContent
+        */
        var $mContent;                    // !< #BC cruft
-    var $mContentObject;              // !<
+
+       /**
+        * Content of the revision we are working on
+        * @var Content
+        * @since 1.WD
+        */
+       var $mContentObject;              // !<
+
+       /**
+        * Is the content ($mContent) already loaded?
+        * @var bool $mContentLoaded
+        */
        var $mContentLoaded = false;      // !<
+
+       /**
+        * The oldid of the article that is to be shown, 0 for the
+        * current revision
+        * @var int|null $mOldId
+        */
        var $mOldId;                      // !<
 
        /**
-        * @var Title
+        * Title from which we were redirected here
+        * @var Title $mRedirectedFrom
         */
        var $mRedirectedFrom = null;
 
        /**
-        * @var mixed: boolean false or URL string
+        * URL to redirect to or false if none
+        * @var string|false $mRedirectUrl
         */
        var $mRedirectUrl = false;        // !<
+
+       /**
+        * Revision ID of revision we are working on
+        * @var int $mRevIdFetched
+        */
        var $mRevIdFetched = 0;           // !<
 
        /**
-        * @var Revision
+        * Revision we are working on
+        * @var Revision $mRevision
         */
        var $mRevision = null;
 
        /**
-        * @var ParserOutput
+        * ParserOutput object
+        * @var ParserOutput $mParserOutput
         */
        var $mParserOutput;
 
@@ -113,14 +162,13 @@ class Article extends Page {
                if ( !$page ) {
                        switch( $title->getNamespace() ) {
                                case NS_FILE:
-                                       $page = new ImagePage( $title ); #FIXME: teach ImagePage to use ContentHandler
+                                       $page = new ImagePage( $title );
                                        break;
                                case NS_CATEGORY:
-                                       $page = new CategoryPage( $title ); #FIXME: teach ImagePage to use ContentHandler
+                                       $page = new CategoryPage( $title );
                                        break;
                                default:
-                    $handler = ContentHandler::getForTitle( $title );
-                                       $page = $handler->createArticle( $title );
+                                       $page = new Article( $title );
                        }
                }
                $page->setContext( $context );
@@ -190,28 +238,33 @@ class Article extends Page {
         * This function has side effects! Do not use this function if you
         * only want the real revision text if any.
         *
-        * @return Return the text of this revision
-     * @deprecated in 1.20; use getContentObject() instead
+        * @deprecated in 1.WD; use getContentObject() instead
+        *
+        * @return string Return the text of this revision
         */
        public function getContent() {
-        wfDeprecated( __METHOD__, '1.20' );
-        $content = $this->getContentObject();
-        return ContentHandler::getContentText( $content );
-    }
+               wfDeprecated( __METHOD__, '1.WD' );
+               $content = $this->getContentObject();
+               return ContentHandler::getContentText( $content );
+       }
 
-    /**
-     * Note that getContent/loadContent do not follow redirects anymore.
-     * If you need to fetch redirectable content easily, try
-     * the shortcut in WikiPage::getRedirectTarget()
-     *
-     * This function has side effects! Do not use this function if you
-     * only want the real revision text if any.
+       /**
+        * Returns a Content object representing the pages effective display content,
+     * not necessarily the revision's content!
      *
-     * @return Return the content of this revision
-     */
-   public function getContentObject() {
+     * Note that getContent/loadContent do not follow redirects anymore.
+        * If you need to fetch redirectable content easily, try
+        * the shortcut in WikiPage::getRedirectTarget()
+        *
+        * This function has side effects! Do not use this function if you
+        * only want the real revision text if any.
+        *
+        * @return Content Return the content of this revision
+        *
+        * @since 1.WD
+        */
+   protected function getContentObject() {
                global $wgUser;
-
                wfProfileIn( __METHOD__ );
 
                if ( $this->mPage->getID() === 0 ) {
@@ -222,12 +275,14 @@ class Article extends Page {
                                if ( $text === false ) {
                                        $text = '';
                                }
+
+                               $content = ContentHandler::makeContent( $text, $this->getTitle() );
                        } else {
-                               $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
+                               $content = new MessageContent( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', null, 'parsemag' );
                        }
                        wfProfileOut( __METHOD__ );
 
-                       return ContentHandler::makeContent( $text, $this->getTitle() );
+                       return $content;
                } else {
                        $this->fetchContentObject();
                        wfProfileOut( __METHOD__ );
@@ -254,11 +309,10 @@ class Article extends Page {
         * @return int The old id for the request
         */
        public function getOldIDFromRequest() {
-               global $wgRequest;
-
                $this->mRedirectUrl = false;
 
-               $oldid = $wgRequest->getIntOrNull( 'oldid' );
+               $request = $this->getContext()->getRequest();
+               $oldid = $request->getIntOrNull( 'oldid' );
 
                if ( $oldid === null ) {
                        return 0;
@@ -267,17 +321,21 @@ class Article extends Page {
                if ( $oldid !== 0 ) {
                        # Load the given revision and check whether the page is another one.
                        # In that case, update this instance to reflect the change.
-                       $this->mRevision = Revision::newFromId( $oldid );
-                       if ( $this->mRevision !== null ) {
-                               // Revision title doesn't match the page title given?
-                               if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
-                                       $function = array( get_class( $this->mPage ), 'newFromID' );
-                                       $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
+                       if ( $oldid === $this->mPage->getLatest() ) {
+                               $this->mRevision = $this->mPage->getRevision();
+                       } else {
+                               $this->mRevision = Revision::newFromId( $oldid );
+                               if ( $this->mRevision !== null ) {
+                                       // Revision title doesn't match the page title given?
+                                       if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
+                                               $function = array( get_class( $this->mPage ), 'newFromID' );
+                                               $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
+                                       }
                                }
                        }
                }
 
-               if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
+               if ( $request->getVal( 'direction' ) == 'next' ) {
                        $nextid = $this->getTitle()->getNextRevisionID( $oldid );
                        if ( $nextid ) {
                                $oldid = $nextid;
@@ -285,7 +343,7 @@ class Article extends Page {
                        } else {
                                $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
                        }
-               } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
+               } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
                        $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
                        if ( $previd ) {
                                $oldid = $previd;
@@ -310,11 +368,16 @@ class Article extends Page {
         * Get text of an article from database
         * Does *NOT* follow redirects.
         *
+        * @protected
+        * @note this is really internal functionality that should really NOT be used by other functions. For accessing
+        *       article content, use the WikiPage class, especially WikiBase::getContent(). However, a lot of legacy code
+        *       uses this method to retrieve page text from the database, so the function has to remain public for now.
+        *
         * @return mixed string containing article contents, or false if null
-     * @deprecated in 1.20, use getContentObject() instead
+        * @deprecated in 1.WD, use WikiPage::getContent() instead
         */
-       protected function fetchContent() { #BC cruft!
-        wfDeprecated( __METHOD__, '1.20' );
+       function fetchContent() { #BC cruft!
+               wfDeprecated( __METHOD__, '1.WD' );
 
                if ( $this->mContentLoaded && $this->mContent ) {
                        return $this->mContent;
@@ -322,10 +385,10 @@ class Article extends Page {
 
                wfProfileIn( __METHOD__ );
 
-        $content = $this->fetchContentObject();
+               $content = $this->fetchContentObject();
 
-        $this->mContent = ContentHandler::getContentText( $content );
-               wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ); #BC cruft!
+               $this->mContent = ContentHandler::getContentText( $content ); #@todo: get rid of mContent everywhere!
+               wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) ); #BC cruft! #XXX: can we deprecate that hook?
 
                wfProfileOut( __METHOD__ );
 
@@ -333,67 +396,72 @@ class Article extends Page {
        }
 
 
-    /**
-     * Get text content object
-     * Does *NOT* follow redirects.
-     *
-     * @return Content object containing article contents, or null
-     */
-    protected function fetchContentObject() {
-        if ( $this->mContentLoaded ) {
-            return $this->mContentObject;
-        }
-
-        wfProfileIn( __METHOD__ );
-
-        $this->mContentLoaded = true;
-        $this->mContent = null;
-
-        $oldid = $this->getOldID();
-
-        # Pre-fill content with error message so that if something
-        # fails we'll have something telling us what we intended.
-        $t = $this->getTitle()->getPrefixedText();
-        $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
-        $this->mContentObject = new MessageContent( 'missing-article', array($t, $d), array() ) ;
-
-        if ( $oldid ) {
-            # $this->mRevision might already be fetched by getOldIDFromRequest()
-            if ( !$this->mRevision ) {
-                $this->mRevision = Revision::newFromId( $oldid );
-                if ( !$this->mRevision ) {
-                    wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
-                    wfProfileOut( __METHOD__ );
-                    return false;
-                }
-            }
-        } else {
-            if ( !$this->mPage->getLatest() ) {
-                wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
-                wfProfileOut( __METHOD__ );
-                return false;
-            }
-
-            $this->mRevision = $this->mPage->getRevision();
-
-            if ( !$this->mRevision ) {
-                wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
-                wfProfileOut( __METHOD__ );
-                return false;
-            }
-        }
-
-        // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
-        // We should instead work with the Revision object when we need it...
-        $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER ); // Loads if user is allowed
-        $this->mRevIdFetched = $this->mRevision->getId();
-
-        wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) ); #FIXME: register new hook
-
-        wfProfileOut( __METHOD__ );
-
-        return $this->mContentObject;
-    }
+       /**
+        * Get text content object
+        * Does *NOT* follow redirects.
+        * TODO: when is this null?
+        *
+        * @note code that wants to retrieve page content from the database should use WikiPage::getContent().
+        *
+        * @return Content|null
+        *
+        * @since 1.WD
+        */
+       protected function fetchContentObject() {
+               if ( $this->mContentLoaded ) {
+                       return $this->mContentObject;
+               }
+
+               wfProfileIn( __METHOD__ );
+
+               $this->mContentLoaded = true;
+               $this->mContent = null;
+
+               $oldid = $this->getOldID();
+
+               # Pre-fill content with error message so that if something
+               # fails we'll have something telling us what we intended.
+               $t = $this->getTitle()->getPrefixedText();
+               $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
+               $this->mContentObject = new MessageContent( 'missing-article', array($t, $d), array() ) ; // @todo: this isn't page content but a UI message. horrible.
+
+               if ( $oldid ) {
+                       # $this->mRevision might already be fetched by getOldIDFromRequest()
+                       if ( !$this->mRevision ) {
+                               $this->mRevision = Revision::newFromId( $oldid );
+                               if ( !$this->mRevision ) {
+                                       wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
+                                       wfProfileOut( __METHOD__ );
+                                       return false;
+                               }
+                       }
+               } else {
+                       if ( !$this->mPage->getLatest() ) {
+                               wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
+                               wfProfileOut( __METHOD__ );
+                               return false;
+                       }
+
+                       $this->mRevision = $this->mPage->getRevision();
+
+                       if ( !$this->mRevision ) {
+                               wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
+                               wfProfileOut( __METHOD__ );
+                               return false;
+                       }
+               }
+
+               // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
+               // We should instead work with the Revision object when we need it...
+               $this->mContentObject = $this->mRevision->getContent( Revision::FOR_THIS_USER ); // Loads if user is allowed
+               $this->mRevIdFetched = $this->mRevision->getId();
+
+               wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
+
+               wfProfileOut( __METHOD__ );
+
+               return $this->mContentObject;
+       }
 
        /**
         * No-op
@@ -448,8 +516,7 @@ class Article extends Page {
         * page of the given title.
         */
        public function view() {
-               global $wgUser, $wgOut, $wgRequest, $wgParser;
-               global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
+               global $wgParser, $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 
                wfProfileIn( __METHOD__ );
 
@@ -459,17 +526,19 @@ class Article extends Page {
                # the first call of this method even if $oldid is used way below.
                $oldid = $this->getOldID();
 
+               $user = $this->getContext()->getUser();
                # Another whitelist check in case getOldID() is altering the title
-               $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
+               $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
                if ( count( $permErrors ) ) {
                        wfDebug( __METHOD__ . ": denied on secondary read check\n" );
                        wfProfileOut( __METHOD__ );
                        throw new PermissionsError( 'read', $permErrors );
                }
 
+               $outputPage = $this->getContext()->getOutput();
                # getOldID() may as well want us to redirect somewhere else
                if ( $this->mRedirectUrl ) {
-                       $wgOut->redirect( $this->mRedirectUrl );
+                       $outputPage->redirect( $this->mRedirectUrl );
                        wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
                        wfProfileOut( __METHOD__ );
 
@@ -477,7 +546,7 @@ class Article extends Page {
                }
 
                # If we got diff in the query, we want to see a diff page instead of the article.
-               if ( $wgRequest->getCheck( 'diff' ) ) {
+               if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
                        wfDebug( __METHOD__ . ": showing diff page\n" );
                        $this->showDiffPage();
                        wfProfileOut( __METHOD__ );
@@ -486,31 +555,31 @@ class Article extends Page {
                }
 
                # Set page title (may be overridden by DISPLAYTITLE)
-               $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
+               $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 
-               $wgOut->setArticleFlag( true );
+               $outputPage->setArticleFlag( true );
                # Allow frames by default
-               $wgOut->allowClickjacking();
+               $outputPage->allowClickjacking();
 
                $parserCache = ParserCache::singleton();
 
                $parserOptions = $this->getParserOptions();
                # Render printable version, use printable version cache
-               if ( $wgOut->isPrintable() ) {
+               if ( $outputPage->isPrintable() ) {
                        $parserOptions->setIsPrintable( true );
                        $parserOptions->setEditSection( false );
-               } elseif ( !$this->getTitle()->quickUserCan( 'edit' ) ) {
+               } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
                        $parserOptions->setEditSection( false );
                }
 
                # Try client and file cache
                if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
                        if ( $wgUseETag ) {
-                               $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
+                               $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
                        }
 
                        # Is it client cached?
-                       if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
+                       if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
                                wfDebug( __METHOD__ . ": done 304\n" );
                                wfProfileOut( __METHOD__ );
 
@@ -519,8 +588,8 @@ class Article extends Page {
                        } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
                                wfDebug( __METHOD__ . ": done file cache\n" );
                                # tell wgOut that output is taken care of
-                               $wgOut->disable();
-                               $this->mPage->doViewUpdates( $wgUser );
+                               $outputPage->disable();
+                               $this->mPage->doViewUpdates( $user );
                                wfProfileOut( __METHOD__ );
 
                                return;
@@ -530,7 +599,7 @@ class Article extends Page {
                # Should the parser cache be used?
                $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
                wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
-               if ( $wgUser->getStubThreshold() ) {
+               if ( $user->getStubThreshold() ) {
                        wfIncrStats( 'pcache_miss_stub' );
                }
 
@@ -568,14 +637,14 @@ class Article extends Page {
                                                        } else {
                                                                wfDebug( __METHOD__ . ": showing parser cache contents\n" );
                                                        }
-                                                       $wgOut->addParserOutput( $this->mParserOutput );
+                                                       $outputPage->addParserOutput( $this->mParserOutput );
                                                        # Ensure that UI elements requiring revision ID have
                                                        # the correct version information.
-                                                       $wgOut->setRevisionId( $this->mPage->getLatest() );
+                                                       $outputPage->setRevisionId( $this->mPage->getLatest() );
                                                        # Preload timestamp to avoid a DB hit
                                                        $cachedTimestamp = $this->mParserOutput->getTimestamp();
                                                        if ( $cachedTimestamp !== null ) {
-                                                               $wgOut->setRevisionTimestamp( $cachedTimestamp );
+                                                               $outputPage->setRevisionTimestamp( $cachedTimestamp );
                                                                $this->mPage->setTimestamp( $cachedTimestamp );
                                                        }
                                                        $outputDone = true;
@@ -599,17 +668,19 @@ class Article extends Page {
 
                                        # Ensure that UI elements requiring revision ID have
                                        # the correct version information.
-                                       $wgOut->setRevisionId( $this->getRevIdFetched() );
+                                       $outputPage->setRevisionId( $this->getRevIdFetched() );
                                        # Preload timestamp to avoid a DB hit
-                                       $wgOut->setRevisionTimestamp( $this->getTimestamp() );
+                                       $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 
                                        # Pages containing custom CSS or JavaScript get special treatment
                                        if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
-                        #FIXME: use ContentHandler for specialized actions insetad.
                                                wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
                                                $this->showCssOrJsPage();
                                                $outputDone = true;
-                                       } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
+                                       } elseif( !wfRunHooks( 'ArticleContentViewCustom', array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
+                                               # Allow extensions do their own custom view for certain pages
+                                               $outputDone = true;
+                                       } elseif( Hooks::isRegistered( 'ArticleViewCustom' ) && !wfRunHooks( 'ArticleViewCustom', array( $this->fetchContent(), $this->getTitle(), $outputPage ) ) ) { #FIXME: fetchContent() is deprecated!
                                                # Allow extensions do their own custom view for certain pages
                                                $outputDone = true;
                                        } else {
@@ -618,10 +689,10 @@ class Article extends Page {
                                                if ( $rt ) {
                                                        wfDebug( __METHOD__ . ": showing redirect=no page\n" );
                                                        # Viewing a redirect page (e.g. with parameter redirect=no)
-                                                       $wgOut->addHTML( $this->viewRedirect( $rt ) );
+                                                       $outputPage->addHTML( $this->viewRedirect( $rt ) );
                                                        # Parse just to get categories, displaytitle, etc.
-                                                       $this->mParserOutput = $content->getParserOutput( $this->getTitle(), $oldid, $parserOptions );
-                                                       $wgOut->addParserOutputNoText( $this->mParserOutput );
+                                                       $this->mParserOutput = $content->getParserOutput( $this->getTitle(), $oldid, $parserOptions, false );
+                                                       $outputPage->addParserOutputNoText( $this->mParserOutput );
                                                        $outputDone = true;
                                                }
                                        }
@@ -630,18 +701,19 @@ class Article extends Page {
                                        # Run the parse, protected by a pool counter
                                        wfDebug( __METHOD__ . ": doing uncached parse\n" );
 
+                                       // @todo: shouldn't we be passing $this->getPage() to PoolWorkArticleView instead of plain $this?
                                        $poolArticleView = new PoolWorkArticleView( $this, $parserOptions,
-                                               $this->getRevIdFetched(), $useParserCache, $this->getContentObject() );
+                                               $this->getRevIdFetched(), $useParserCache, $this->getContentObject(), $this->getContext() );
 
                                        if ( !$poolArticleView->execute() ) {
                                                $error = $poolArticleView->getError();
                                                if ( $error ) {
-                                                       $wgOut->clearHTML(); // for release() errors
-                                                       $wgOut->enableClientCache( false );
-                                                       $wgOut->setRobotPolicy( 'noindex,nofollow' );
+                                                       $outputPage->clearHTML(); // for release() errors
+                                                       $outputPage->enableClientCache( false );
+                                                       $outputPage->setRobotPolicy( 'noindex,nofollow' );
 
                                                        $errortext = $error->getWikiText( false, 'view-pool-error' );
-                                                       $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
+                                                       $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
                                                }
                                                # Connection or timeout error
                                                wfProfileOut( __METHOD__ );
@@ -649,12 +721,12 @@ class Article extends Page {
                                        }
 
                                        $this->mParserOutput = $poolArticleView->getParserOutput();
-                                       $wgOut->addParserOutput( $this->mParserOutput );
+                                       $outputPage->addParserOutput( $this->mParserOutput );
 
                                        # Don't cache a dirty ParserOutput object
                                        if ( $poolArticleView->getIsDirty() ) {
-                                               $wgOut->setSquidMaxage( 0 );
-                                               $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
+                                               $outputPage->setSquidMaxage( 0 );
+                                               $outputPage->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
                                        }
 
                                        $outputDone = true;
@@ -683,17 +755,17 @@ class Article extends Page {
                if ( $this->getTitle()->isMainPage() ) {
                        $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
                        if ( !$msg->isDisabled() ) {
-                               $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
+                               $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
                        }
                }
 
                # Check for any __NOINDEX__ tags on the page using $pOutput
                $policy = $this->getRobotPolicy( 'view', $pOutput );
-               $wgOut->setIndexPolicy( $policy['index'] );
-               $wgOut->setFollowPolicy( $policy['follow'] );
+               $outputPage->setIndexPolicy( $policy['index'] );
+               $outputPage->setFollowPolicy( $policy['follow'] );
 
                $this->showViewFooter();
-               $this->mPage->doViewUpdates( $wgUser );
+               $this->mPage->doViewUpdates( $user );
 
                wfProfileOut( __METHOD__ );
        }
@@ -703,11 +775,10 @@ class Article extends Page {
         * @param $pOutput ParserOutput
         */
        public function adjustDisplayTitle( ParserOutput $pOutput ) {
-               global $wgOut;
                # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
                $titleText = $pOutput->getTitleText();
                if ( strval( $titleText ) !== '' ) {
-                       $wgOut->setPageTitle( $titleText );
+                       $this->getContext()->getOutput()->setPageTitle( $titleText );
                }
        }
 
@@ -716,23 +787,25 @@ class Article extends Page {
         * Article::view() only, other callers should use the DifferenceEngine class.
         */
        public function showDiffPage() {
-               global $wgRequest, $wgUser;
-
-               $diff = $wgRequest->getVal( 'diff' );
-               $rcid = $wgRequest->getVal( 'rcid' );
-               $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
-               $purge = $wgRequest->getVal( 'action' ) == 'purge';
-               $unhide = $wgRequest->getInt( 'unhide' ) == 1;
+               $request = $this->getContext()->getRequest();
+               $user = $this->getContext()->getUser();
+               $diff = $request->getVal( 'diff' );
+               $rcid = $request->getVal( 'rcid' );
+               $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
+               $purge = $request->getVal( 'action' ) == 'purge';
+               $unhide = $request->getInt( 'unhide' ) == 1;
                $oldid = $this->getOldID();
 
-               $de = new DifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
+               $contentHandler = ContentHandler::getForTitle( $this->getTitle() );
+               $de = $contentHandler->createDifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
+
                // DifferenceEngine directly fetched the revision:
                $this->mRevIdFetched = $de->mNewid;
                $de->showDiffPage( $diffOnly );
 
                if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
                        # Run view updates for current revision only
-                       $this->mPage->doViewUpdates( $wgUser );
+                       $this->mPage->doViewUpdates( $user );
                }
        }
 
@@ -743,18 +816,20 @@ class Article extends Page {
         * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
         * page views.
         */
-       protected function showCssOrJsPage() { #FIXME: move this to ContentHandler!
+       protected function showCssOrJsPage( $showCacheHint = true ) {
                global $wgOut;
 
-               $dir = $this->getContext()->getLanguage()->getDir();
-               $lang = $this->getContext()->getLanguage()->getCode();
+               if ( $showCacheHint ) {
+                       $dir = $this->getContext()->getLanguage()->getDir();
+                       $lang = $this->getContext()->getLanguage()->getCode();
 
-               $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
-                       'clearyourcache' ); #FIXME: do this in handler
+                       $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
+                               'clearyourcache' );
+               }
 
                // Give hooks a chance to customise the output
-               if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
-            $po = $this->mContentObject->getParserOutput();
+               if ( !Hooks::isRegistered('ShowRawCssJs') || wfRunHooks( 'ShowRawCssJs', array( $this->fetchContent(), $this->getTitle(), $wgOut ) ) ) { #FIXME: fetchContent() is deprecated
+                       $po = $this->mContentObject->getParserOutput( $this->getTitle() );
                        $wgOut->addHTML( $po->getText() );
                }
        }
@@ -767,8 +842,7 @@ class Article extends Page {
         * TODO: actions other than 'view'
         */
        public function getRobotPolicy( $action, $pOutput ) {
-               global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
-               global $wgDefaultRobotPolicy, $wgRequest;
+               global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 
                $ns = $this->getTitle()->getNamespace();
 
@@ -790,13 +864,13 @@ class Article extends Page {
                                'index'  => 'noindex',
                                'follow' => 'nofollow'
                        );
-               } elseif ( $wgOut->isPrintable() ) {
+               } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
                        # Discourage indexing of printable versions, but encourage following
                        return array(
                                'index'  => 'noindex',
                                'follow' => 'follow'
                        );
-               } elseif ( $wgRequest->getInt( 'curid' ) ) {
+               } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
                        # For ?curid=x urls, disallow indexing
                        return array(
                                'index'  => 'noindex',
@@ -839,7 +913,7 @@ class Article extends Page {
         * merging of several policies using array_merge().
         * @param $policy Mixed, returns empty array on null/false/'', transparent
         *            to already-converted arrays, converts String.
-        * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
+        * @return Array: 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
         */
        public static function formatRobotPolicy( $policy ) {
                if ( is_array( $policy ) ) {
@@ -865,15 +939,16 @@ class Article extends Page {
 
        /**
         * If this request is a redirect view, send "redirected from" subtitle to
-        * $wgOut. Returns true if the header was needed, false if this is not a
-        * redirect view. Handles both local and remote redirects.
+        * the output. Returns true if the header was needed, false if this is not
+        * redirect view. Handles both local and remote redirects.
         *
         * @return boolean
         */
        public function showRedirectedFromHeader() {
-               global $wgOut, $wgRequest, $wgRedirectSources;
+               global $wgRedirectSources;
+               $outputPage = $this->getContext()->getOutput();
 
-               $rdfrom = $wgRequest->getVal( 'rdfrom' );
+               $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 
                if ( isset( $this->mRedirectedFrom ) ) {
                        // This is an internally redirected page view.
@@ -886,21 +961,21 @@ class Article extends Page {
                                        array( 'redirect' => 'no' )
                                );
 
-                               $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
+                               $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 
                                // Set the fragment if one was specified in the redirect
                                if ( strval( $this->getTitle()->getFragment() ) != '' ) {
                                        $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
-                                       $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
+                                       $outputPage->addInlineScript( "redirectToFragment(\"$fragment\");" );
                                }
 
                                // Add a <link rel="canonical"> tag
-                               $wgOut->addLink( array( 'rel' => 'canonical',
+                               $outputPage->addLink( array( 'rel' => 'canonical',
                                        'href' => $this->getTitle()->getLocalURL() )
                                );
 
-                               // Tell $wgOut the user arrived at this article through a redirect
-                               $wgOut->setRedirectedFrom( $this->mRedirectedFrom );
+                               // Tell the output object that the user arrived at this article through a redirect
+                               $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
 
                                return true;
                        }
@@ -909,7 +984,7 @@ class Article extends Page {
                        // If it was reported from a trusted site, supply a backlink.
                        if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
                                $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
-                               $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
+                               $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 
                                return true;
                        }
@@ -923,11 +998,9 @@ class Article extends Page {
         * [[MediaWiki:Talkpagetext]]. For Article::view().
         */
        public function showNamespaceHeader() {
-               global $wgOut;
-
                if ( $this->getTitle()->isTalkPage() ) {
                        if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
-                               $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
+                               $this->getContext()->getOutput()->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
                        }
                }
        }
@@ -936,11 +1009,9 @@ class Article extends Page {
         * Show the footer section of an ordinary page view
         */
        public function showViewFooter() {
-               global $wgOut;
-
                # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
                if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
-                       $wgOut->addWikiMsg( 'anontalkpagetext' );
+                       $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
                }
 
                # If we have been passed an &rcid= parameter, we want to give the user a
@@ -957,18 +1028,19 @@ class Article extends Page {
         * desired, does nothing.
         */
        public function showPatrolFooter() {
-               global $wgOut, $wgRequest, $wgUser;
-
-               $rcid = $wgRequest->getVal( 'rcid' );
+               $request = $this->getContext()->getRequest();
+               $outputPage = $this->getContext()->getOutput();
+               $user = $this->getContext()->getUser();
+               $rcid = $request->getVal( 'rcid' );
 
                if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
                        return;
                }
 
-               $token = $wgUser->getEditToken( $rcid );
-               $wgOut->preventClickjacking();
+               $token = $user->getEditToken( $rcid );
+               $outputPage->preventClickjacking();
 
-               $wgOut->addHTML(
+               $outputPage->addHTML(
                        "<div class='patrollink'>" .
                                wfMsgHtml(
                                        'markaspatrolledlink',
@@ -993,7 +1065,8 @@ class Article extends Page {
         * namespace, show the default message text. To be called from Article::view().
         */
        public function showMissingArticle() {
-               global $wgOut, $wgRequest, $wgUser, $wgSend404Code;
+               global $wgSend404Code;
+               $outputPage = $this->getContext()->getOutput();
 
                # Show info in user (talk) namespace. Does the user exist? Is he blocked?
                if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
@@ -1003,11 +1076,11 @@ class Article extends Page {
                        $ip = User::isIP( $rootPart );
 
                        if ( !($user && $user->isLoggedIn()) && !$ip ) { # User does not exist
-                               $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
+                               $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
                                        array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
                        } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
                                LogEventsList::showLogExtract(
-                                       $wgOut,
+                                       $outputPage,
                                        'block',
                                        $user->getUserPage()->getPrefixedText(),
                                        '',
@@ -1026,13 +1099,25 @@ class Article extends Page {
                wfRunHooks( 'ShowMissingArticle', array( $this ) );
 
                # Show delete and move logs
-               LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
+               LogEventsList::showLogExtract( $outputPage, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
                        array(  'lim' => 10,
                                'conds' => array( "log_action != 'revision'" ),
                                'showIfEmpty' => false,
                                'msgKey' => array( 'moveddeleted-notice' ) )
                );
 
+               if ( !$this->mPage->hasViewableContent() && $wgSend404Code ) {
+                       // If there's no backing content, send a 404 Not Found
+                       // for better machine handling of broken links.
+                       $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
+               }
+
+               $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
+
+               if ( ! $hookResult ) {
+                       return;
+               }
+
                # Show error message
                $oldid = $this->getOldID();
                if ( $oldid ) {
@@ -1043,8 +1128,8 @@ class Article extends Page {
                        // Use the default message text
                        $text = $this->getTitle()->getDefaultMessageText();
                } else {
-                       $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
-                       $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
+                       $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $this->getContext()->getUser() );
+                       $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getContext()->getUser() );
                        $errors = array_merge( $createErrors, $editErrors );
 
                        if ( !count( $errors ) ) {
@@ -1055,43 +1140,36 @@ class Article extends Page {
                }
                $text = "<div class='noarticletext'>\n$text\n</div>";
 
-               if ( !$this->mPage->hasViewableContent() && $wgSend404Code ) {
-                       // If there's no backing content, send a 404 Not Found
-                       // for better machine handling of broken links.
-                       $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
-               }
-
-               $wgOut->addWikiText( $text );
+               $outputPage->addWikiText( $text );
        }
 
        /**
         * If the revision requested for view is deleted, check permissions.
-        * Send either an error message or a warning header to $wgOut.
+        * Send either an error message or a warning header to the output.
         *
         * @return boolean true if the view is allowed, false if not.
         */
        public function showDeletedRevisionHeader() {
-               global $wgOut, $wgRequest;
-
                if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
                        // Not deleted
                        return true;
                }
 
+               $outputPage = $this->getContext()->getOutput();
                // If the user is not allowed to see it...
                if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
-                       $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
+                       $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
                                'rev-deleted-text-permission' );
 
                        return false;
                // If the user needs to confirm that they want to see it...
-               } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
+               } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
                        # Give explanation and add a link to view the revision...
                        $oldid = intval( $this->getOldID() );
                        $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
                        $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
                                'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
-                       $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
+                       $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
                                array( $msg, $link ) );
 
                        return false;
@@ -1099,7 +1177,7 @@ class Article extends Page {
                } else {
                        $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
                                'rev-suppressed-text-view' : 'rev-deleted-text-view';
-                       $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
+                       $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 
                        return true;
                }
@@ -1111,30 +1189,34 @@ class Article extends Page {
         *   Revision as of \<date\>; view current revision
         *   \<- Previous version | Next Version -\>
         *
-        * @param $oldid String: revision ID of this article revision
+        * @param $oldid int: revision ID of this article revision
         */
        public function setOldSubtitle( $oldid = 0 ) {
-               global $wgLang, $wgOut, $wgUser, $wgRequest;
-
                if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
                        return;
                }
 
-               $unhide = $wgRequest->getInt( 'unhide' ) == 1;
+               $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
 
                # Cascade unhide param in links for easy deletion browsing
                $extraParams = array();
-               if ( $wgRequest->getVal( 'unhide' ) ) {
+               if ( $unhide ) {
                        $extraParams['unhide'] = 1;
                }
 
-               $revision = Revision::newFromId( $oldid );
+               if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
+                       $revision = $this->mRevision;
+               } else {
+                       $revision = Revision::newFromId( $oldid );
+               }
+
                $timestamp = $revision->getTimestamp();
 
                $current = ( $oldid == $this->mPage->getLatest() );
-               $td = $wgLang->timeanddate( $timestamp, true );
-               $tddate = $wgLang->date( $timestamp, true );
-               $tdtime = $wgLang->time( $timestamp, true );
+               $language = $this->getContext()->getLanguage();
+               $td = $language->timeanddate( $timestamp, true );
+               $tddate = $language->date( $timestamp, true );
+               $tdtime = $language->time( $timestamp, true );
 
                # Show user links if allowed to see them. If hidden, then show them only if requested...
                $userlinks = Linker::revUserTools( $revision, !$unhide );
@@ -1143,7 +1225,8 @@ class Article extends Page {
                        ? 'revision-info-current'
                        : 'revision-info';
 
-               $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
+               $outputPage = $this->getContext()->getOutput();
+               $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
                        $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
                        $tdtime, $revision->getUser() )->parse() . "</div>" );
 
@@ -1218,12 +1301,12 @@ class Article extends Page {
                                array( 'known', 'noclasses' )
                        );
 
-               $cdel = Linker::getRevDeleteLink( $wgUser, $revision, $this->getTitle() );
+               $cdel = Linker::getRevDeleteLink( $this->getContext()->getUser(), $revision, $this->getTitle() );
                if ( $cdel !== '' ) {
                        $cdel .= ' ';
                }
 
-               $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
+               $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
                        wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
                        $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
        }
@@ -1237,7 +1320,7 @@ class Article extends Page {
         * @return string containing HMTL with redirect link
         */
        public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
-               global $wgOut, $wgStylePath;
+               global $wgStylePath;
 
                if ( !is_array( $target ) ) {
                        $target = array( $target );
@@ -1247,7 +1330,7 @@ class Article extends Page {
                $imageDir = $lang->getDir();
 
                if ( $appendSubtitle ) {
-                       $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
+                       $this->getContext()->getOutput()->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
                }
 
                // the loop prepends the arrow image before the link, so the first case needs to be outside
@@ -1285,9 +1368,7 @@ class Article extends Page {
         * Handle action=render
         */
        public function render() {
-               global $wgOut;
-
-               $wgOut->setArticleBodyOnly( true );
+               $this->getContext()->getOutput()->setArticleBodyOnly( true );
                $this->view();
        }
 
@@ -1310,8 +1391,6 @@ class Article extends Page {
         * UI entry point for page deletion
         */
        public function delete() {
-               global $wgOut, $wgRequest, $wgLang;
-
                # This code desperately needs to be totally rewritten
 
                $title = $this->getTitle();
@@ -1333,13 +1412,14 @@ class Article extends Page {
                $conds = $title->pageCond();
                $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
                if ( $latest === false ) {
-                       $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
-                       $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
+                       $outputPage = $this->getContext()->getOutput();
+                       $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
+                       $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
                                        array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
                                );
-                       $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
+                       $outputPage->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
                        LogEventsList::showLogExtract(
-                               $wgOut,
+                               $outputPage,
                                'delete',
                                $title->getPrefixedText()
                        );
@@ -1347,8 +1427,9 @@ class Article extends Page {
                        return;
                }
 
-               $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
-               $deleteReason = $wgRequest->getText( 'wpReason' );
+               $request = $this->getContext()->getRequest();
+               $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
+               $deleteReason = $request->getText( 'wpReason' );
 
                if ( $deleteReasonList == 'other' ) {
                        $reason = $deleteReason;
@@ -1359,15 +1440,15 @@ class Article extends Page {
                        $reason = $deleteReasonList;
                }
 
-               if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
+               if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
                        array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
                {
                        # Flag to hide all contents of the archived revisions
-                       $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
+                       $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
 
                        $this->doDelete( $reason, $suppress );
 
-                       if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
+                       if ( $request->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
                                $this->doWatch();
                        } elseif ( $title->userIsWatching() ) {
                                $this->doUnwatch();
@@ -1379,15 +1460,21 @@ class Article extends Page {
                // Generate deletion reason
                $hasHistory = false;
                if ( !$reason ) {
-                       $reason = $this->generateReason( $hasHistory );
+                       try {
+                               $reason = $this->generateReason( $hasHistory );
+                       } catch (MWException $e) {
+                               # if a page is horribly broken, we still want to be able to delete it. so be lenient about errors here.
+                               wfDebug("Error while building auto delete summary: $e");
+                               $reason = '';
+                       }
                }
 
                // If the page has a history, insert a warning
                if ( $hasHistory ) {
                        $revisions = $this->mTitle->estimateRevisionCount();
                        // @todo FIXME: i18n issue/patchwork message
-                       $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
-                               wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
+                       $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
+                               wfMsgExt( 'historywarning', array( 'parseinline' ), $this->getContext()->getLanguage()->formatNum( $revisions ) ) .
                                wfMsgHtml( 'word-separator' ) . Linker::link( $title,
                                        wfMsgHtml( 'history' ),
                                        array( 'rel' => 'archives' ),
@@ -1397,8 +1484,8 @@ class Article extends Page {
 
                        if ( $this->mTitle->isBigDeletion() ) {
                                global $wgDeleteRevisionsLimit;
-                               $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
-                                       array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
+                               $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
+                                       array( 'delete-warning-toobig', $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit ) ) );
                        }
                }
 
@@ -1411,16 +1498,15 @@ class Article extends Page {
         * @param $reason String: prefilled reason
         */
        public function confirmDelete( $reason ) {
-               global $wgOut;
-
                wfDebug( "Article::confirmDelete\n" );
 
-               $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
-               $wgOut->addBacklinkSubtitle( $this->getTitle() );
-               $wgOut->setRobotPolicy( 'noindex,nofollow' );
-               $wgOut->addWikiMsg( 'confirmdeletetext' );
+               $outputPage = $this->getContext()->getOutput();
+               $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
+               $outputPage->addBacklinkSubtitle( $this->getTitle() );
+               $outputPage->setRobotPolicy( 'noindex,nofollow' );
+               $outputPage->addWikiMsg( 'confirmdeletetext' );
 
-               wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
+               wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
 
                $user = $this->getContext()->getUser();
 
@@ -1504,9 +1590,9 @@ class Article extends Page {
                                $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
                        }
 
-               $wgOut->addHTML( $form );
-               $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
-               LogEventsList::showLogExtract( $wgOut, 'delete',
+               $outputPage->addHTML( $form );
+               $outputPage->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
+               LogEventsList::showLogExtract( $outputPage, 'delete',
                        $this->getTitle()->getPrefixedText()
                );
        }
@@ -1517,34 +1603,33 @@ class Article extends Page {
         * @param $suppress bool
         */
        public function doDelete( $reason, $suppress = false ) {
-               global $wgOut;
-
                $error = '';
+               $outputPage = $this->getContext()->getOutput();
                if ( $this->mPage->doDeleteArticle( $reason, $suppress, 0, true, $error ) ) {
                        $deleted = $this->getTitle()->getPrefixedText();
 
-                       $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
-                       $wgOut->setRobotPolicy( 'noindex,nofollow' );
+                       $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
+                       $outputPage->setRobotPolicy( 'noindex,nofollow' );
 
                        $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
 
-                       $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
-                       $wgOut->returnToMain( false );
+                       $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
+                       $outputPage->returnToMain( false );
                } else {
-                       $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
+                       $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
                        if ( $error == '' ) {
-                               $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
+                               $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
                                        array( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
                                );
-                               $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
+                               $outputPage->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
 
                                LogEventsList::showLogExtract(
-                                       $wgOut,
+                                       $outputPage,
                                        'delete',
                                        $this->getTitle()->getPrefixedText()
                                );
                        } else {
-                               $wgOut->addHTML( $error );
+                               $outputPage->addHTML( $error );
                        }
                }
        }
@@ -1617,9 +1702,7 @@ class Article extends Page {
         * @return ParserOutput or false if the given revsion ID is not found
         */
        public function getParserOutput( $oldid = null, User $user = null ) {
-               global $wgUser;
-
-               $user = is_null( $user ) ? $wgUser : $user;
+               $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
                $parserOptions = $this->mPage->makeParserOptions( $user );
 
                return $this->mPage->getParserOutput( $parserOptions, $oldid );
@@ -1627,12 +1710,11 @@ class Article extends Page {
 
        /**
         * Get parser options suitable for rendering the primary article wikitext
-        * @return ParserOptions|false
+        * @return ParserOptions
         */
        public function getParserOptions() {
-               global $wgUser;
                if ( !$this->mParserOptions ) {
-                       $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
+                       $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext()->getUser() );
                }
                // Clone to allow modifications of the return value without affecting cache
                return clone $this->mParserOptions;
@@ -1684,6 +1766,7 @@ class Article extends Page {
        /**
         * Handle action=purge
         * @deprecated since 1.19
+        * @return Action|bool|null false if the action is disabled, null if it is not recognised
         */
        public function purge() {
                return Action::factory( 'purge', $this )->show();
@@ -1718,7 +1801,7 @@ class Article extends Page {
        }
 
        /**
-        * Add this page to $wgUser's watchlist
+        * Add this page to the current user's watchlist
         *
         * This is safe to be called multiple times
         *
@@ -1726,9 +1809,8 @@ class Article extends Page {
         * @deprecated since 1.18
         */
        public function doWatch() {
-               global $wgUser;
                wfDeprecated( __METHOD__, '1.18' );
-               return WatchAction::doWatch( $this->getTitle(), $wgUser );
+               return WatchAction::doWatch( $this->getTitle(), $this->getContext()->getUser() );
        }
 
        /**
@@ -1747,24 +1829,21 @@ class Article extends Page {
         * @deprecated since 1.18
         */
        public function doUnwatch() {
-               global $wgUser;
                wfDeprecated( __METHOD__, '1.18' );
-               return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
+               return WatchAction::doUnwatch( $this->getTitle(), $this->getContext()->getUser() );
        }
 
        /**
         * Output a redirect back to the article.
         * This is typically used after an edit.
         *
-        * @deprecated in 1.18; call $wgOut->redirect() directly
+        * @deprecated in 1.18; call OutputPage::redirect() directly
         * @param $noRedir Boolean: add redirect=no
         * @param $sectionAnchor String: section to redirect to, including "#"
         * @param $extraQuery String: extra query params
         */
        public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
                wfDeprecated( __METHOD__, '1.18' );
-               global $wgOut;
-
                if ( $noRedir ) {
                        $query = 'redirect=no';
                        if ( $extraQuery )
@@ -1773,7 +1852,7 @@ class Article extends Page {
                        $query = $extraQuery;
                }
 
-               $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
+               $this->getContext()->getOutput()->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
        }
 
        /**
@@ -1815,6 +1894,7 @@ class Article extends Page {
         *
         * @param $fname String Name of called method
         * @param $args Array Arguments to the method
+        * @return mixed
         */
        public function __call( $fname, $args ) {
                if ( is_callable( array( $this->mPage, $fname ) ) ) {
@@ -1871,8 +1951,7 @@ class Article extends Page {
         * @return array
         */
        public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
-               global $wgUser;
-               $user = is_null( $user ) ? $wgUser : $user;
+               $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
                return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
        }
 
@@ -1885,8 +1964,7 @@ class Article extends Page {
         * @return array
         */
        public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
-               global $wgUser;
-               $guser = is_null( $guser ) ? $wgUser : $guser;
+               $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
                return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
        }
 
@@ -1895,8 +1973,8 @@ class Article extends Page {
         * @return mixed
         */
        public function generateReason( &$hasHistory ) {
-        $title = $this->mPage->getTitle();
-        $handler = ContentHandler::getForTitle( $title );
+               $title = $this->mPage->getTitle();
+               $handler = ContentHandler::getForTitle( $title );
                return $handler->getAutoDeleteReason( $title, $hasHistory );
        }
 
@@ -1935,7 +2013,7 @@ class Article extends Page {
         * @param $newtext
         * @param $flags
         * @return string
-     * @deprecated since 1.20, use ContentHandler::getAutosummary() instead
+        * @deprecated since 1.WD, use ContentHandler::getAutosummary() instead
         */
        public static function getAutosummary( $oldtext, $newtext, $flags ) {
                return WikiPage::getAutosummary( $oldtext, $newtext, $flags );