Fix for r102997: forgot to change that variable

[lhc/web/wiklou.git] / includes / Article.php

<?php
/**
 * File for articles
 * @file
 */

/**
 * Class for viewing MediaWiki article and history.
 *
 * This maintains WikiPage functions for backwards compatibility.
 *
 * @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
 * moved to separate EditPage and HTMLFileCache classes.
 *
 * @internal documentation reviewed 15 Mar 2010
 */
class Article extends Page {
        /**@{{
         * @private
         */

        /**
         * @var IContextSource
         */
        protected $mContext;

        /**
         * @var WikiPage
         */
        protected $mPage;

        /**
         * @var ParserOptions: ParserOptions object for $wgUser articles
         */
        public $mParserOptions;

        var $mContent;                    // !<
        var $mContentLoaded = false;      // !<
        var $mOldId;                      // !<

        /**
         * @var Title
         */
        var $mRedirectedFrom = null;

        /**
         * @var mixed: boolean false or URL string
         */
        var $mRedirectUrl = false;        // !<
        var $mRevIdFetched = 0;           // !<

        /**
         * @var Revision
         */
        var $mRevision = null;

        /**
         * @var ParserOutput
         */
        var $mParserOutput;

        /**@}}*/

        /**
         * Constructor and clear the article
         * @param $title Title Reference to a Title object.
         * @param $oldId Integer revision ID, null to fetch from request, zero for current
         */
        public function __construct( Title $title, $oldId = null ) {
                $this->mOldId = $oldId;
                $this->mPage = $this->newPage( $title );
        }

        /**
         * @param $title Title
         * @return WikiPage
         */
        protected function newPage( Title $title ) {
                return new WikiPage( $title );
        }

        /**
         * Constructor from a page id
         * @param $id Int article ID to load
         * @return Article|null
         */
        public static function newFromID( $id ) {
                $t = Title::newFromID( $id );
                # @todo FIXME: Doesn't inherit right
                return $t == null ? null : new self( $t );
                # return $t == null ? null : new static( $t ); // PHP 5.3
        }

        /**
         * Create an Article object of the appropriate class for the given page.
         *
         * @param $title Title
         * @param $context IContextSource
         * @return Article object
         */
        public static function newFromTitle( $title, IContextSource $context ) {
                if ( NS_MEDIA == $title->getNamespace() ) {
                        // FIXME: where should this go?
                        $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
                }

                $page = null;
                wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
                if ( !$page ) {
                        switch( $title->getNamespace() ) {
                                case NS_FILE:
                                        $page = new ImagePage( $title );
                                        break;
                                case NS_CATEGORY:
                                        $page = new CategoryPage( $title );
                                        break;
                                default:
                                        $page = new Article( $title );
                        }
                }
                $page->setContext( $context );

                return $page;
        }

        /**
         * Tell the page view functions that this view was redirected
         * from another page on the wiki.
         * @param $from Title object.
         */
        public function setRedirectedFrom( Title $from ) {
                $this->mRedirectedFrom = $from;
        }

        /**
         * Get the title object of the article
         * @return Title object of this page
         */
        public function getTitle() {
                return $this->mPage->getTitle();
        }

        /**
         * Clear the object
         */
        public function clear() {
                $this->mContentLoaded = false;

                $this->mRedirectedFrom = null; # Title object if set
                $this->mRevIdFetched = 0;
                $this->mRedirectUrl = false;

                $this->mPage->clear();
        }

        /**
         * Note that getContent/loadContent do not follow redirects anymore.
         * If you need to fetch redirectable content easily, try
         * the shortcut in Article::followRedirect()
         *
         * 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
         */
        public function getContent() {
                global $wgUser;

                wfProfileIn( __METHOD__ );

                if ( $this->mPage->getID() === 0 ) {
                        # If this is a MediaWiki:x message, then load the messages
                        # and return the message value for x.
                        if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
                                $text = $this->getTitle()->getDefaultMessageText();
                                if ( $text === false ) {
                                        $text = '';
                                }
                        } else {
                                $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
                        }
                        wfProfileOut( __METHOD__ );

                        return $text;
                } else {
                        $this->fetchContent();
                        wfProfileOut( __METHOD__ );

                        return $this->mContent;
                }
        }

        /**
         * @return int The oldid of the article that is to be shown, 0 for the
         *             current revision
         */
        public function getOldID() {
                if ( is_null( $this->mOldId ) ) {
                        $this->mOldId = $this->getOldIDFromRequest();
                }

                return $this->mOldId;
        }

        /**
         * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
         *
         * @return int The old id for the request
         */
        public function getOldIDFromRequest() {
                global $wgRequest;

                $this->mRedirectUrl = false;

                $oldid = $wgRequest->getIntOrNull( 'oldid' );

                if ( $oldid === null ) {
                        return 0;
                }

                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 ( $wgRequest->getVal( 'direction' ) == 'next' ) {
                        $nextid = $this->getTitle()->getNextRevisionID( $oldid );
                        if ( $nextid ) {
                                $oldid = $nextid;
                        } else {
                                $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
                        }
                } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
                        $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
                        if ( $previd ) {
                                $oldid = $previd;
                        }
                }

                return $oldid;
        }

        /**
         * Load the revision (including text) into this object
         *
         * @deprecated in 1.19; use fetchContent()
         */
        function loadContent() {
                $this->fetchContent();
        }

        /**
         * Get text of an article from database
         * Does *NOT* follow redirects.
         *
         * @return mixed string containing article contents, or false if null
         */
        function fetchContent() {
                if ( $this->mContentLoaded ) {
                        return $this->mContent;
                }

                wfProfileIn( __METHOD__ );

                $this->mContentLoaded = true;

                $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->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;

                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 $oldid\n" );
                                        return false;
                                }
                        }
                } else {
                        if ( !$this->mPage->getLatest() ) {
                                wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
                                return false;
                        }

                        $this->mRevision = $this->mPage->getRevision();
                        if ( !$this->mRevision ) {
                                wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
                                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->mContent = $this->mRevision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
                $this->mRevIdFetched = $this->mRevision->getId();

                wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );

                wfProfileOut( __METHOD__ );

                return $this->mContent;
        }

        /**
         * No-op
         * @deprecated since 1.18
         */
        public function forUpdate() {
                wfDeprecated( __METHOD__ );
        }

        /**
         * Returns true if the currently-referenced revision is the current edit
         * to this page (and it exists).
         * @return bool
         */
        public function isCurrent() {
                # If no oldid, this is the current version.
                if ( $this->getOldID() == 0 ) {
                        return true;
                }

                return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
        }

        /**
         * Use this to fetch the rev ID used on page views
         *
         * @return int revision ID of last article revision
         */
        public function getRevIdFetched() {
                if ( $this->mRevIdFetched ) {
                        return $this->mRevIdFetched;
                } else {
                        return $this->mPage->getLatest();
                }
        }

        /**
         * This is the default action of the index.php entry point: just view the
         * page of the given title.
         */
        public function view() {
                global $wgUser, $wgOut, $wgRequest, $wgParser;
                global $wgUseFileCache, $wgUseETag;

                wfProfileIn( __METHOD__ );

                # Get variables from query string
                # As side effect this will load the revision and update the title
                # in a revision ID is passed in the request, so this should remain
                # the first call of this method even if $oldid is used way below.
                $oldid = $this->getOldID();

                # Another whitelist check in case getOldID() is altering the title
                $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
                if ( count( $permErrors ) ) {
                        wfDebug( __METHOD__ . ": denied on secondary read check\n" );
                        wfProfileOut( __METHOD__ );
                        throw new PermissionsError( 'read', $permErrors );
                }

                # getOldID() may as well want us to redirect somewhere else
                if ( $this->mRedirectUrl ) {
                        $wgOut->redirect( $this->mRedirectUrl );
                        wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
                        wfProfileOut( __METHOD__ );

                        return;
                }

                # If we got diff in the query, we want to see a diff page instead of the article.
                if ( $wgRequest->getCheck( 'diff' ) ) {
                        wfDebug( __METHOD__ . ": showing diff page\n" );
                        $this->showDiffPage();
                        wfProfileOut( __METHOD__ );

                        return;
                }

                # Set page title (may be overridden by DISPLAYTITLE)
                $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );

                $wgOut->setArticleFlag( true );
                # Allow frames by default
                $wgOut->allowClickjacking();

                $parserCache = ParserCache::singleton();

                $parserOptions = $this->getParserOptions();
                # Render printable version, use printable version cache
                if ( $wgOut->isPrintable() ) {
                        $parserOptions->setIsPrintable( true );
                        $parserOptions->setEditSection( false );
                } elseif ( !$this->getTitle()->quickUserCan( 'edit' ) ) {
                        $parserOptions->setEditSection( false );
                }

                # Try client and file cache
                if ( $oldid === 0 && $this->mPage->checkTouched() ) {
                        if ( $wgUseETag ) {
                                $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
                        }

                        # Is it client cached?
                        if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
                                wfDebug( __METHOD__ . ": done 304\n" );
                                wfProfileOut( __METHOD__ );

                                return;
                        # Try file cache
                        } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
                                wfDebug( __METHOD__ . ": done file cache\n" );
                                # tell wgOut that output is taken care of
                                $wgOut->disable();
                                $this->mPage->viewUpdates();
                                wfProfileOut( __METHOD__ );

                                return;
                        }
                }

                # Should the parser cache be used?
                $useParserCache = $this->mPage->isParserCacheUsed( $wgUser, $oldid );
                wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
                if ( $wgUser->getStubThreshold() ) {
                        wfIncrStats( 'pcache_miss_stub' );
                }

                $this->showRedirectedFromHeader();
                $this->showNamespaceHeader();

                # Iterate through the possible ways of constructing the output text.
                # Keep going until $outputDone is set, or we run out of things to do.
                $pass = 0;
                $outputDone = false;
                $this->mParserOutput = false;

                while ( !$outputDone && ++$pass ) {
                        switch( $pass ) {
                                case 1:
                                        wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
                                        break;
                                case 2:
                                        # Early abort if the page doesn't exist
                                        if ( !$this->mPage->exists() ) {
                                                wfDebug( __METHOD__ . ": showing missing article\n" );
                                                $this->showMissingArticle();
                                                wfProfileOut( __METHOD__ );
                                                return;
                                        }

                                        # Try the parser cache
                                        if ( $useParserCache ) {
                                                $this->mParserOutput = $parserCache->get( $this, $parserOptions );

                                                if ( $this->mParserOutput !== false ) {
                                                        if ( $oldid ) {
                                                                wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
                                                                $this->setOldSubtitle( $oldid );
                                                        } else {
                                                                wfDebug( __METHOD__ . ": showing parser cache contents\n" );
                                                        }
                                                        $wgOut->addParserOutput( $this->mParserOutput );
                                                        # Ensure that UI elements requiring revision ID have
                                                        # the correct version information.
                                                        $wgOut->setRevisionId( $this->mPage->getLatest() );
                                                        $outputDone = true;
                                                        # Preload timestamp to avoid a DB hit
                                                        if ( isset( $this->mParserOutput->mTimestamp ) ) {
                                                                $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
                                                        }
                                                }
                                        }
                                        break;
                                case 3:
                                        # This will set $this->mRevision if needed
                                        $this->fetchContent();

                                        # Are we looking at an old revision
                                        if ( $oldid && $this->mRevision ) {
                                                $this->setOldSubtitle( $oldid );

                                                if ( !$this->showDeletedRevisionHeader() ) {
                                                        wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
                                                        wfProfileOut( __METHOD__ );
                                                        return;
                                                }
                                        }

                                        # Ensure that UI elements requiring revision ID have
                                        # the correct version information.
                                        $wgOut->setRevisionId( $this->getRevIdFetched() );

                                        # Pages containing custom CSS or JavaScript get special treatment
                                        if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
                                                wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
                                                $this->showCssOrJsPage();
                                                $outputDone = true;
                                        } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
                                                # Allow extensions do their own custom view for certain pages
                                                $outputDone = true;
                                        } else {
                                                $text = $this->getContent();
                                                $rt = Title::newFromRedirectArray( $text );
                                                if ( $rt ) {
                                                        wfDebug( __METHOD__ . ": showing redirect=no page\n" );
                                                        # Viewing a redirect page (e.g. with parameter redirect=no)
                                                        $wgOut->addHTML( $this->viewRedirect( $rt ) );
                                                        # Parse just to get categories, displaytitle, etc.
                                                        $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
                                                        $wgOut->addParserOutputNoText( $this->mParserOutput );
                                                        $outputDone = true;
                                                }
                                        }
                                        break;
                                case 4:
                                        # Run the parse, protected by a pool counter
                                        wfDebug( __METHOD__ . ": doing uncached parse\n" );

                                        $key = $parserCache->getKey( $this, $parserOptions );
                                        $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );

                                        if ( !$poolArticleView->execute() ) {
                                                # Connection or timeout error
                                                wfProfileOut( __METHOD__ );
                                                return;
                                        } else {
                                                $outputDone = true;
                                        }
                                        break;
                                # Should be unreachable, but just in case...
                                default:
                                        break 2;
                        }
                }

                # Get the ParserOutput actually *displayed* here.
                # Note that $this->mParserOutput is the *current* version output.
                $pOutput = ( $outputDone instanceof ParserOutput )
                        ? $outputDone // object fetched by hook
                        : $this->mParserOutput;

                # Adjust title for main page & pages with displaytitle
                if ( $pOutput ) {
                        $this->adjustDisplayTitle( $pOutput );
                }

                # For the main page, overwrite the <title> element with the con-
                # tents of 'pagetitle-view-mainpage' instead of the default (if
                # that's not empty).
                # This message always exists because it is in the i18n files
                if ( $this->getTitle()->isMainPage() ) {
                        $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
                        if ( !$msg->isDisabled() ) {
                                $wgOut->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'] );

                $this->showViewFooter();
                $this->mPage->viewUpdates();

                wfProfileOut( __METHOD__ );
        }

        /**
         * Adjust title for pages with displaytitle, -{T|}- or language conversion
         * @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 );
                }
        }

        /**
         * Show a diff page according to current request variables. For use within
         * 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;
                $oldid = $this->getOldID();

                $de = new DifferenceEngine( $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->viewUpdates();
                }
        }

        /**
         * Show a page view for a page formatted as CSS or JavaScript. To be called by
         * Article::view() only.
         *
         * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
         * page views.
         */
        protected function showCssOrJsPage() {
                global $wgOut;

                $dir = $this->getContext()->getLang()->getDir();
                $lang = $this->getContext()->getLang()->getCode();

                $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$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 ) ) ) {
                        // Wrap the whole lot in a <pre> and don't parse
                        $m = array();
                        preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
                        $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
                        $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
                        $wgOut->addHTML( "\n</pre>\n" );
                }
        }

        /**
         * Get the robot policy to be used for the current view
         * @param $action String the action= GET parameter
         * @param $pOutput ParserOutput
         * @return Array the policy that should be set
         * TODO: actions other than 'view'
         */
        public function getRobotPolicy( $action, $pOutput ) {
                global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
                global $wgDefaultRobotPolicy, $wgRequest;

                $ns = $this->getTitle()->getNamespace();

                if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
                        # Don't index user and user talk pages for blocked users (bug 11443)
                        if ( !$this->getTitle()->isSubpage() ) {
                                if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
                                        return array(
                                                'index'  => 'noindex',
                                                'follow' => 'nofollow'
                                        );
                                }
                        }
                }

                if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
                        # Non-articles (special pages etc), and old revisions
                        return array(
                                'index'  => 'noindex',
                                'follow' => 'nofollow'
                        );
                } elseif ( $wgOut->isPrintable() ) {
                        # Discourage indexing of printable versions, but encourage following
                        return array(
                                'index'  => 'noindex',
                                'follow' => 'follow'
                        );
                } elseif ( $wgRequest->getInt( 'curid' ) ) {
                        # For ?curid=x urls, disallow indexing
                        return array(
                                'index'  => 'noindex',
                                'follow' => 'follow'
                        );
                }

                # Otherwise, construct the policy based on the various config variables.
                $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );

                if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
                        # Honour customised robot policies for this namespace
                        $policy = array_merge(
                                $policy,
                                self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
                        );
                }
                if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
                        # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
                        # a final sanity check that we have really got the parser output.
                        $policy = array_merge(
                                $policy,
                                array( 'index' => $pOutput->getIndexPolicy() )
                        );
                }

                if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
                        # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
                        $policy = array_merge(
                                $policy,
                                self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
                        );
                }

                return $policy;
        }

        /**
         * Converts a String robot policy into an associative array, to allow
         * 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>
         */
        public static function formatRobotPolicy( $policy ) {
                if ( is_array( $policy ) ) {
                        return $policy;
                } elseif ( !$policy ) {
                        return array();
                }

                $policy = explode( ',', $policy );
                $policy = array_map( 'trim', $policy );

                $arr = array();
                foreach ( $policy as $var ) {
                        if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
                                $arr['index'] = $var;
                        } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
                                $arr['follow'] = $var;
                        }
                }

                return $arr;
        }

        /**
         * 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.
         *
         * @return boolean
         */
        public function showRedirectedFromHeader() {
                global $wgOut, $wgRequest, $wgRedirectSources;

                $rdfrom = $wgRequest->getVal( 'rdfrom' );

                if ( isset( $this->mRedirectedFrom ) ) {
                        // This is an internally redirected page view.
                        // We'll need a backlink to the source page for navigation.
                        if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
                                $redir = Linker::linkKnown(
                                        $this->mRedirectedFrom,
                                        null,
                                        array(),
                                        array( 'redirect' => 'no' )
                                );

                                $wgOut->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\");" );
                                }

                                // Add a <link rel="canonical"> tag
                                $wgOut->addLink( array( 'rel' => 'canonical',
                                        'href' => $this->getTitle()->getLocalURL() )
                                );

                                return true;
                        }
                } elseif ( $rdfrom ) {
                        // This is an externally redirected view, from some other wiki.
                        // 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 ) );

                                return true;
                        }
                }

                return false;
        }

        /**
         * Show a header specific to the namespace currently being viewed, like
         * [[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' ) );
                        }
                }
        }

        /**
         * Show the footer section of an ordinary page view
         */
        public function showViewFooter() {
                global $wgOut, $wgUseTrackbacks;

                # 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' );
                }

                # If we have been passed an &rcid= parameter, we want to give the user a
                # chance to mark this new article as patrolled.
                $this->showPatrolFooter();

                # Trackbacks
                if ( $wgUseTrackbacks ) {
                        $this->addTrackbacks();
                }

                wfRunHooks( 'ArticleViewFooter', array( $this ) );

        }

        /**
         * If patrol is possible, output a patrol UI box. This is called from the
         * footer section of ordinary page views. If patrol is not possible or not
         * desired, does nothing.
         */
        public function showPatrolFooter() {
                global $wgOut, $wgRequest, $wgUser;

                $rcid = $wgRequest->getVal( 'rcid' );

                if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
                        return;
                }

                $token = $wgUser->editToken( $rcid );
                $wgOut->preventClickjacking();

                $wgOut->addHTML(
                        "<div class='patrollink'>" .
                                wfMsgHtml(
                                        'markaspatrolledlink',
                                        Linker::link(
                                                $this->getTitle(),
                                                wfMsgHtml( 'markaspatrolledtext' ),
                                                array(),
                                                array(
                                                        'action' => 'markpatrolled',
                                                        'rcid' => $rcid,
                                                        'token' => $token,
                                                ),
                                                array( 'known', 'noclasses' )
                                        )
                                ) .
                        '</div>'
                );
        }

        /**
         * Show the error text for a missing article. For articles in the MediaWiki
         * namespace, show the default message text. To be called from Article::view().
         */
        public function showMissingArticle() {
                global $wgOut, $wgRequest, $wgUser;

                # 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 ) {
                        $parts = explode( '/', $this->getTitle()->getText() );
                        $rootPart = $parts[0];
                        $user = User::newFromName( $rootPart, false /* allow IP users*/ );
                        $ip = User::isIP( $rootPart );

                        if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
                                $wgOut->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,
                                        'block',
                                        $user->getUserPage()->getPrefixedText(),
                                        '',
                                        array(
                                                'lim' => 1,
                                                'showIfEmpty' => false,
                                                'msgKey' => array(
                                                        'blocked-notice-logextract',
                                                        $user->getName() # Support GENDER in notice
                                                )
                                        )
                                );
                        }
                }

                wfRunHooks( 'ShowMissingArticle', array( $this ) );

                # Show delete and move logs
                LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
                        array(  'lim' => 10,
                                'conds' => array( "log_action != 'revision'" ),
                                'showIfEmpty' => false,
                                'msgKey' => array( 'moveddeleted-notice' ) )
                );

                # Show error message
                $oldid = $this->getOldID();
                if ( $oldid ) {
                        $text = wfMsgNoTrans( 'missing-article',
                                $this->getTitle()->getPrefixedText(),
                                wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
                } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
                        // Use the default message text
                        $text = $this->getTitle()->getDefaultMessageText();
                } else {
                        $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
                        $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
                        $errors = array_merge( $createErrors, $editErrors );

                        if ( !count( $errors ) ) {
                                $text = wfMsgNoTrans( 'noarticletext' );
                        } else {
                                $text = wfMsgNoTrans( 'noarticletext-nopermission' );
                        }
                }
                $text = "<div class='noarticletext'>\n$text\n</div>";

                if ( !$this->mPage->hasViewableContent() ) {
                        // 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 );
        }

        /**
         * If the revision requested for view is deleted, check permissions.
         * Send either an error message or a warning header to $wgOut.
         *
         * @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;
                }

                // 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",
                                'rev-deleted-text-permission' );

                        return false;
                // If the user needs to confirm that they want to see it...
                } elseif ( $wgRequest->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",
                                array( $msg, $link ) );

                        return false;
                // We are allowed to see...
                } 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 );

                        return true;
                }
        }

        /**
         * Generate the navigation links when browsing through an article revisions
         * It shows the information as:
         *   Revision as of \<date\>; view current revision
         *   \<- Previous version | Next Version -\>
         *
         * @param $oldid String: 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;

                # Cascade unhide param in links for easy deletion browsing
                $extraParams = array();
                if ( $wgRequest->getVal( 'unhide' ) ) {
                        $extraParams['unhide'] = 1;
                }

                $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 );

                # Show user links if allowed to see them. If hidden, then show them only if requested...
                $userlinks = Linker::revUserTools( $revision, !$unhide );

                $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
                        ? 'revision-info-current'
                        : 'revision-info';

                $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
                        $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
                        $tdtime, $revision->getUser() )->parse() . "</div>" );

                $lnk = $current
                        ? wfMsgHtml( 'currentrevisionlink' )
                        : Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'currentrevisionlink' ),
                                array(),
                                $extraParams,
                                array( 'known', 'noclasses' )
                        );
                $curdiff = $current
                        ? wfMsgHtml( 'diff' )
                        : Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'diff' ),
                                array(),
                                array(
                                        'diff' => 'cur',
                                        'oldid' => $oldid
                                ) + $extraParams,
                                array( 'known', 'noclasses' )
                        );
                $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
                $prevlink = $prev
                        ? Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'previousrevision' ),
                                array(),
                                array(
                                        'direction' => 'prev',
                                        'oldid' => $oldid
                                ) + $extraParams,
                                array( 'known', 'noclasses' )
                        )
                        : wfMsgHtml( 'previousrevision' );
                $prevdiff = $prev
                        ? Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'diff' ),
                                array(),
                                array(
                                        'diff' => 'prev',
                                        'oldid' => $oldid
                                ) + $extraParams,
                                array( 'known', 'noclasses' )
                        )
                        : wfMsgHtml( 'diff' );
                $nextlink = $current
                        ? wfMsgHtml( 'nextrevision' )
                        : Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'nextrevision' ),
                                array(),
                                array(
                                        'direction' => 'next',
                                        'oldid' => $oldid
                                ) + $extraParams,
                                array( 'known', 'noclasses' )
                        );
                $nextdiff = $current
                        ? wfMsgHtml( 'diff' )
                        : Linker::link(
                                $this->getTitle(),
                                wfMsgHtml( 'diff' ),
                                array(),
                                array(
                                        'diff' => 'next',
                                        'oldid' => $oldid
                                ) + $extraParams,
                                array( 'known', 'noclasses' )
                        );

                $cdel = '';

                // User can delete revisions or view deleted revisions...
                $canHide = $wgUser->isAllowed( 'deleterevision' );
                if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
                        if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
                                $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
                        } else {
                                $query = array(
                                        'type'   => 'revision',
                                        'target' => $this->getTitle()->getPrefixedDbkey(),
                                        'ids'    => $oldid
                                );
                                $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
                        }
                        $cdel .= ' ';
                }

                $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
                        wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
                        $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
        }

        /**
         * Execute the uncached parse for action=view
         * @return bool
         */
        public function doViewParse() {
                global $wgOut;

                $oldid = $this->getOldID();
                $parserOptions = $this->getParserOptions();

                # Render printable version, use printable version cache
                $parserOptions->setIsPrintable( $wgOut->isPrintable() );

                # Don't show section-edit links on old revisions... this way lies madness.
                if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
                        $parserOptions->setEditSection( false );
                }

                $useParserCache = $this->useParserCache( $oldid );
                $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );

                return true;
        }

        /**
         * Try to fetch an expired entry from the parser cache. If it is present,
         * output it and return true. If it is not present, output nothing and
         * return false. This is used as a callback function for
         * PoolCounter::executeProtected().
         *
         * @return boolean
         */
        public function tryDirtyCache() {
                global $wgOut;
                $parserCache = ParserCache::singleton();
                $options = $this->getParserOptions();

                if ( $wgOut->isPrintable() ) {
                        $options->setIsPrintable( true );
                        $options->setEditSection( false );
                }

                $output = $parserCache->getDirty( $this, $options );

                if ( $output ) {
                        wfDebug( __METHOD__ . ": sending dirty output\n" );
                        wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
                        $wgOut->setSquidMaxage( 0 );
                        $this->mParserOutput = $output;
                        $wgOut->addParserOutput( $output );
                        $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );

                        return true;
                } else {
                        wfDebugLog( 'dirty', "dirty missing\n" );
                        wfDebug( __METHOD__ . ": no dirty cache\n" );

                        return false;
                }
        }

        /**
         * View redirect
         *
         * @param $target Title|Array of destination(s) to redirect
         * @param $appendSubtitle Boolean [optional]
         * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
         * @return string containing HMTL with redirect link
         */
        public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
                global $wgOut, $wgStylePath;

                if ( !is_array( $target ) ) {
                        $target = array( $target );
                }

                $lang = $this->getTitle()->getPageLanguage();
                $imageDir = $lang->getDir();

                if ( $appendSubtitle ) {
                        $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
                }

                // the loop prepends the arrow image before the link, so the first case needs to be outside

                /**
                 * @var $title Title
                 */
                $title = array_shift( $target );

                if ( $forceKnown ) {
                        $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
                } else {
                        $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
                }

                $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
                $alt = $lang->isRTL() ? '←' : '→';
                // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
                foreach ( $target as $rt ) {
                        $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
                        if ( $forceKnown ) {
                                $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
                        } else {
                                $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
                        }
                }

                $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
                return '<div class="redirectMsg">' .
                        Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
                        '<span class="redirectText">' . $link . '</span></div>';
        }

        /**
         * Builds trackback links for article display if $wgUseTrackbacks is set to true
         */
        public function addTrackbacks() {
                global $wgOut;

                $dbr = wfGetDB( DB_SLAVE );
                $tbs = $dbr->select( 'trackbacks',
                        array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
                        array( 'tb_page' => $this->mPage->getID() )
                );

                if ( !$dbr->numRows( $tbs ) ) {
                        return;
                }

                $wgOut->preventClickjacking();

                $tbtext = "";
                foreach ( $tbs as $o ) {
                        $rmvtxt = "";

                        if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
                                $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
                                        $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
                                $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
                        }

                        $tbtext .= "\n";
                        $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
                                        $o->tb_title,
                                        $o->tb_url,
                                        $o->tb_ex,
                                        $o->tb_name,
                                        $rmvtxt );
                }

                $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
        }

        /**
         * Handle action=render
         */
        public function render() {
                global $wgOut;

                $wgOut->setArticleBodyOnly( true );
                $this->view();
        }

        /**
         * action=protect handler
         */
        public function protect() {
                $form = new ProtectionForm( $this );
                $form->execute();
        }

        /**
         * action=unprotect handler (alias)
         */
        public function unprotect() {
                $this->protect();
        }

        /**
         * UI entry point for page deletion
         */
        public function delete() {
                global $wgOut, $wgRequest, $wgLang;

                # This code desperately needs to be totally rewritten

                $title = $this->getTitle();
                $user = $this->getContext()->getUser();

                # Check permissions
                $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
                if ( count( $permission_errors ) ) {
                        throw new PermissionsError( 'delete', $permission_errors );
                }

                # Read-only check...
                if ( wfReadOnly() ) {
                        throw new ReadOnlyError;
                }

                # Better double-check that it hasn't been deleted yet!
                $dbw = wfGetDB( DB_MASTER );
                $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>",
                                        array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
                                );
                        $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
                        LogEventsList::showLogExtract(
                                $wgOut,
                                'delete',
                                $title->getPrefixedText()
                        );

                        return;
                }

                # Hack for big sites
                $bigHistory = $this->mPage->isBigDeletion();
                if ( $bigHistory && !$title->userCan( 'bigdelete' ) ) {
                        global $wgDeleteRevisionsLimit;

                        $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
                        $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
                                array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );

                        return;
                }

                $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
                $deleteReason = $wgRequest->getText( 'wpReason' );

                if ( $deleteReasonList == 'other' ) {
                        $reason = $deleteReason;
                } elseif ( $deleteReason != '' ) {
                        // Entry from drop down menu + additional comment
                        $reason = $deleteReasonList . wfMsgForContent( 'colon-separator' ) . $deleteReason;
                } else {
                        $reason = $deleteReasonList;
                }

                if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
                        array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
                {
                        # Flag to hide all contents of the archived revisions
                        $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );

                        $this->doDelete( $reason, $suppress );

                        if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
                                $this->doWatch();
                        } elseif ( $title->userIsWatching() ) {
                                $this->doUnwatch();
                        }

                        return;
                }

                // Generate deletion reason
                $hasHistory = false;
                if ( !$reason ) {
                        $reason = $this->generateReason( $hasHistory );
                }

                // If the page has a history, insert a warning
                if ( $hasHistory ) {
                        $revisions = $this->mPage->estimateRevisionCount();
                        // @todo FIXME: i18n issue/patchwork message
                        $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
                                wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
                                wfMsgHtml( 'word-separator' ) . Linker::link( $title,
                                        wfMsgHtml( 'history' ),
                                        array( 'rel' => 'archives' ),
                                        array( 'action' => 'history' ) ) .
                                '</strong>'
                        );

                        if ( $bigHistory ) {
                                global $wgDeleteRevisionsLimit;
                                $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
                                        array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
                        }
                }

                return $this->confirmDelete( $reason );
        }

        /**
         * Output deletion confirmation dialog
         * @todo FIXME: Move to another file?
         * @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' );

                wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );

                $user = $this->getContext()->getUser();

                if ( $user->isAllowed( 'suppressrevision' ) ) {
                        $suppress = "<tr id=\"wpDeleteSuppressRow\">
                                        <td></td>
                                        <td class='mw-input'><strong>" .
                                                Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
                                                        'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
                                        "</strong></td>
                                </tr>";
                } else {
                        $suppress = '';
                }
                $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();

                $form = Xml::openElement( 'form', array( 'method' => 'post',
                        'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
                        Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
                        Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
                        Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
                        "<tr id=\"wpDeleteReasonListRow\">
                                <td class='mw-label'>" .
                                        Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
                                "</td>
                                <td class='mw-input'>" .
                                        Xml::listDropDown( 'wpDeleteReasonList',
                                                wfMsgForContent( 'deletereason-dropdown' ),
                                                wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
                                "</td>
                        </tr>
                        <tr id=\"wpDeleteReasonRow\">
                                <td class='mw-label'>" .
                                        Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
                                "</td>
                                <td class='mw-input'>" .
                                Html::input( 'wpReason', $reason, 'text', array(
                                        'size' => '60',
                                        'maxlength' => '255',
                                        'tabindex' => '2',
                                        'id' => 'wpReason',
                                        'autofocus'
                                ) ) .
                                "</td>
                        </tr>";

                # Disallow watching if user is not logged in
                if ( $user->isLoggedIn() ) {
                        $form .= "
                        <tr>
                                <td></td>
                                <td class='mw-input'>" .
                                        Xml::checkLabel( wfMsg( 'watchthis' ),
                                                'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
                                "</td>
                        </tr>";
                }

                $form .= "
                        $suppress
                        <tr>
                                <td></td>
                                <td class='mw-submit'>" .
                                        Xml::submitButton( wfMsg( 'deletepage' ),
                                                array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
                                "</td>
                        </tr>" .
                        Xml::closeElement( 'table' ) .
                        Xml::closeElement( 'fieldset' ) .
                        Html::hidden( 'wpEditToken', $user->editToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
                        Xml::closeElement( 'form' );

                        if ( $user->isAllowed( 'editinterface' ) ) {
                                $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
                                $link = Linker::link(
                                        $title,
                                        wfMsgHtml( 'delete-edit-reasonlist' ),
                                        array(),
                                        array( 'action' => 'edit' )
                                );
                                $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
                        }

                $wgOut->addHTML( $form );
                $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
                LogEventsList::showLogExtract( $wgOut, 'delete',
                        $this->getTitle()->getPrefixedText()
                );
        }

        /**
         * Perform a deletion and output success or failure messages
         * @param $reason
         * @param $suppress bool
         */
        public function doDelete( $reason, $suppress = false ) {
                global $wgOut;

                $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );

                $error = '';
                if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, true, $error ) ) {
                        $deleted = $this->getTitle()->getPrefixedText();

                        $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
                        $wgOut->setRobotPolicy( 'noindex,nofollow' );

                        $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';

                        $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
                        $wgOut->returnToMain( false );
                } else {
                        $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
                        if ( $error == '' ) {
                                $wgOut->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' ) ) );

                                LogEventsList::showLogExtract(
                                        $wgOut,
                                        'delete',
                                        $this->getTitle()->getPrefixedText()
                                );
                        } else {
                                $wgOut->addHTML( $error );
                        }
                }
        }

        /* Caching functions */

        /**
         * checkLastModified returns true if it has taken care of all
         * output to the client that is necessary for this request.
         * (that is, it has sent a cached version of the page)
         *
         * @return boolean true if cached version send, false otherwise
         */
        protected function tryFileCache() {
                static $called = false;

                if ( $called ) {
                        wfDebug( "Article::tryFileCache(): called twice!?\n" );
                        return false;
                }

                $called = true;
                if ( $this->isFileCacheable() ) {
                        $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
                        if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
                                wfDebug( "Article::tryFileCache(): about to load file\n" );
                                $cache->loadFromFileCache( $this->getContext() );
                                return true;
                        } else {
                                wfDebug( "Article::tryFileCache(): starting buffer\n" );
                                ob_start( array( &$cache, 'saveToFileCache' ) );
                        }
                } else {
                        wfDebug( "Article::tryFileCache(): not cacheable\n" );
                }

                return false;
        }

        /**
         * Check if the page can be cached
         * @return bool
         */
        public function isFileCacheable() {
                $cacheable = false;

                if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
                        $cacheable = $this->mPage->getID()
                                && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
                        // Extension may have reason to disable file caching on some pages.
                        if ( $cacheable ) {
                                $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
                        }
                }

                return $cacheable;
        }

        /**#@-*/

        /**
         * Add the primary page-view wikitext to the output buffer
         * Saves the text into the parser cache if possible.
         * Updates templatelinks if it is out of date.
         *
         * @param $text String
         * @param $cache Boolean
         * @param $parserOptions mixed ParserOptions object, or boolean false
         */
        public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
                global $wgOut;

                $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );

                $this->doCascadeProtectionUpdates( $this->mParserOutput );

                $wgOut->addParserOutput( $this->mParserOutput );
        }

        /**
         * Lightweight method to get the parser output for a page, checking the parser cache
         * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
         * consider, so it's not appropriate to use there.
         *
         * @since 1.16 (r52326) for LiquidThreads
         *
         * @param $oldid mixed integer Revision ID or null
         * @param $user User The relevant user
         * @return ParserOutput or false if the given revsion ID is not found
         */
        public function getParserOutput( $oldid = null, User $user = null ) {
                global $wgEnableParserCache, $wgUser;
                $user = is_null( $user ) ? $wgUser : $user;

                wfProfileIn( __METHOD__ );
                // Should the parser cache be used?
                $useParserCache = $wgEnableParserCache &&
                        $user->getStubThreshold() == 0 &&
                        $this->mPage->exists() &&
                        $oldid === null;

                wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );

                if ( $user->getStubThreshold() ) {
                        wfIncrStats( 'pcache_miss_stub' );
                }

                if ( $useParserCache ) {
                        $options = $this->mPage->makeParserOptions( $user );
                        $parserOutput = ParserCache::singleton()->get( $this, $options );
                        if ( $parserOutput !== false ) {
                                wfProfileOut( __METHOD__ );
                                return $parserOutput;
                        }
                }

                // Cache miss; parse and output it.
                if ( $oldid === null ) {
                        $text = $this->mPage->getRawText();
                } else {
                        $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
                        if ( $rev === null ) {
                                wfProfileOut( __METHOD__ );
                                return false;
                        }
                        $text = $rev->getText();
                }

                $output = $this->getOutputFromWikitext( $text, $useParserCache );
                wfProfileOut( __METHOD__ );
                return $output;
        }

        /**
         * This does all the heavy lifting for outputWikitext, except it returns the parser
         * output instead of sending it straight to $wgOut. Makes things nice and simple for,
         * say, embedding thread pages within a discussion system (LiquidThreads)
         *
         * @param $text string
         * @param $cache boolean
         * @param $parserOptions parsing options, defaults to false
         * @return ParserOutput
         */
        public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
                global $wgParser, $wgEnableParserCache, $wgUseFileCache;

                if ( !$parserOptions ) {
                        $parserOptions = $this->getParserOptions();
                }

                $time = - wfTime();
                $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
                        $parserOptions, true, true, $this->getRevIdFetched() );
                $time += wfTime();

                # Timing hack
                if ( $time > 3 ) {
                        wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
                                $this->getTitle()->getPrefixedDBkey() ) );
                }

                if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
                        $parserCache = ParserCache::singleton();
                        $parserCache->save( $this->mParserOutput, $this, $parserOptions );
                }

                // Make sure file cache is not used on uncacheable content.
                // Output that has magic words in it can still use the parser cache
                // (if enabled), though it will generally expire sooner.
                if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
                        $wgUseFileCache = false;
                }

                if ( $this->isCurrent() ) {
                        $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
                }

                return $this->mParserOutput;
        }

        /**
         * Get parser options suitable for rendering the primary article wikitext
         * @return ParserOptions|false
         */
        public function getParserOptions() {
                global $wgUser;
                if ( !$this->mParserOptions ) {
                        $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
                }
                // Clone to allow modifications of the return value without affecting cache
                return clone $this->mParserOptions;
        }

        /**
         * Sets the context this Article is executed in
         *
         * @param $context IContextSource
         * @since 1.18
         */
        public function setContext( $context ) {
                $this->mContext = $context;
        }

        /**
         * Gets the context this Article is executed in
         *
         * @return IContextSource
         * @since 1.18
         */
        public function getContext() {
                if ( $this->mContext instanceof IContextSource ) {
                        return $this->mContext;
                } else {
                        wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
                        return RequestContext::getMain();
                }
        }

        /**
         * Removes trackback record for current article from trackbacks table
         * @deprecated since 1.18
         */
        public function deletetrackback() {
                return Action::factory( 'deletetrackback', $this )->show();
        }

        /**
         * Info about this page
         * @deprecated since 1.19
         */
        public function info() {
                Action::factory( 'info', $this )->show();
        }

        /**
         * Mark this particular edit/page as patrolled
         * @deprecated since 1.18
         */
        public function markpatrolled() {
                Action::factory( 'markpatrolled', $this )->show();
        }

        /**
         * Handle action=purge
         * @deprecated since 1.19
         */
        public function purge() {
                return Action::factory( 'purge', $this )->show();
        }

        /**
         * Handle action=revert
         * @deprecated since 1.19
         */
        public function revert() {
                Action::factory( 'revert', $this )->show();
        }

        /**
         * Handle action=rollback
         * @deprecated since 1.19
         */
        public function rollback() {
                Action::factory( 'rollback', $this )->show();
        }

        /**
         * User-interface handler for the "watch" action.
         * Requires Request to pass a token as of 1.18.
         * @deprecated since 1.18
         */
        public function watch() {
                Action::factory( 'watch', $this )->show();
        }

        /**
         * Add this page to $wgUser's watchlist
         *
         * This is safe to be called multiple times
         *
         * @return bool true on successful watch operation
         * @deprecated since 1.18
         */
        public function doWatch() {
                global $wgUser;
                return WatchAction::doWatch( $this->getTitle(), $wgUser );
        }

        /**
         * User interface handler for the "unwatch" action.
         * Requires Request to pass a token as of 1.18.
         * @deprecated since 1.18
         */
        public function unwatch() {
                Action::factory( 'unwatch', $this )->show();
        }

        /**
         * Stop watching a page
         * @return bool true on successful unwatch
         * @deprecated since 1.18
         */
        public function doUnwatch() {
                global $wgUser;
                return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
        }

        /**
         * Output a redirect back to the article.
         * This is typically used after an edit.
         *
         * @deprecated in 1.18; call $wgOut->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__ );
                global $wgOut;

                if ( $noRedir ) {
                        $query = 'redirect=no';
                        if ( $extraQuery )
                                $query .= "&$extraQuery";
                } else {
                        $query = $extraQuery;
                }

                $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
        }

        /**
         * Use PHP's magic __get handler to handle accessing of
         * raw WikiPage fields for backwards compatibility.
         *
         * @param $fname String Field name
         */
        public function __get( $fname ) {
                if ( property_exists( $this->mPage, $fname ) ) {
                        #wfWarn( "Access to raw $fname field " . __CLASS__ );
                        return $this->mPage->$fname;
                }
                trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
        }

        /**
         * Use PHP's magic __set handler to handle setting of
         * raw WikiPage fields for backwards compatibility.
         *
         * @param $fname String Field name
         * @param $fvalue mixed New value
         */
        public function __set( $fname, $fvalue ) {
                if ( property_exists( $this->mPage, $fname ) ) {
                        #wfWarn( "Access to raw $fname field of " . __CLASS__ );
                        $this->mPage->$fname = $fvalue;
                // Note: extensions may want to toss on new fields
                } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
                        $this->mPage->$fname = $fvalue;
                } else {
                        trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
                }
        }

        /**
         * Use PHP's magic __call handler to transform instance calls to
         * WikiPage functions for backwards compatibility.
         *
         * @param $fname String Name of called method
         * @param $args Array Arguments to the method
         */
        public function __call( $fname, $args ) {
                if ( is_callable( array( $this->mPage, $fname ) ) ) {
                        #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
                        return call_user_func_array( array( $this->mPage, $fname ), $args );
                }
                trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
        }

        // ****** B/C functions to work-around PHP silliness with __call and references ****** //

        /**
         * @param $limit array
         * @param $reason string
         * @param $cascade int
         * @param $expiry array
         * @return bool
         */
        public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
                return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
        }

        /**
         * @param $reason string
         * @param $suppress bool
         * @param $id int
         * @param $commit bool
         * @param $error string
         * @return bool
         */
        public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
                return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
        }

        /**
         * @param $fromP
         * @param $summary
         * @param $token
         * @param $bot
         * @param $resultDetails
         * @param $user User
         * @return array
         */
        public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
                global $wgUser;
                $user = is_null( $user ) ? $wgUser : $user;
                return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
        }

        /**
         * @param $fromP
         * @param $summary
         * @param $bot
         * @param $resultDetails
         * @param $guser User
         * @return array
         */
        public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
                global $wgUser;
                $guser = is_null( $guser ) ? $wgUser : $guser;
                return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
        }

        /**
         * @param $hasHistory bool
         * @return mixed
         */
        public function generateReason( &$hasHistory ) {
                return $this->mPage->getAutoDeleteReason( $hasHistory );
        }

        // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //

        /**
         * @return array
         */
        public static function selectFields() {
                return WikiPage::selectFields();
        }

        /**
         * @param $title Title
         */
        public static function onArticleCreate( $title ) {
                WikiPage::onArticleCreate( $title );
        }

        /**
         * @param $title Title
         */
        public static function onArticleDelete( $title ) {
                WikiPage::onArticleDelete( $title );
        }

        /**
         * @param $title Title
         */
        public static function onArticleEdit( $title ) {
                WikiPage::onArticleEdit( $title );
        }

        /**
         * @param $oldtext
         * @param $newtext
         * @param $flags
         * @return string
         */
        public static function getAutosummary( $oldtext, $newtext, $flags ) {
                return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
        }
        // ******
}

class PoolWorkArticleView extends PoolCounterWork {

        /**
         * @var Article
         */
        private $mArticle;

        function __construct( $article, $key, $useParserCache, $parserOptions ) {
                parent::__construct( 'ArticleView', $key );
                $this->mArticle = $article;
                $this->cacheable = $useParserCache;
                $this->parserOptions = $parserOptions;
        }

        /**
         * @return bool
         */
        function doWork() {
                return $this->mArticle->doViewParse();
        }

        /**
         * @return bool
         */
        function getCachedWork() {
                global $wgOut;

                $parserCache = ParserCache::singleton();
                $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );

                if ( $this->mArticle->mParserOutput !== false ) {
                        wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
                        $wgOut->addParserOutput( $this->mArticle->mParserOutput );
                        # Ensure that UI elements requiring revision ID have
                        # the correct version information.
                        $wgOut->setRevisionId( $this->mArticle->getLatest() );
                        return true;
                }
                return false;
        }

        /**
         * @return bool
         */
        function fallback() {
                return $this->mArticle->tryDirtyCache();
        }

        /**
         * @param $status Status
         */
        function error( $status ) {
                global $wgOut;

                $wgOut->clearHTML(); // for release() errors
                $wgOut->enableClientCache( false );
                $wgOut->setRobotPolicy( 'noindex,nofollow' );

                $errortext = $status->getWikiText( false, 'view-pool-error' );
                $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );

                return false;
        }
}