Fix fixme on r107328, attempting to use $this in a static method
[lhc/web/wiklou.git] / includes / WikiPage.php
index aca2b0c..c61efe5 100644 (file)
@@ -15,29 +15,30 @@ abstract class Page {}
 class WikiPage extends Page {
        /**
         * @var Title
-        * @protected
         */
        public $mTitle = null;
 
        /**@{{
         * @protected
         */
-       public $mCounter = -1;               // !< Integer (-1 means "not loaded")
        public $mDataLoaded = false;         // !< Boolean
        public $mIsRedirect = false;         // !< Boolean
-       public $mLatest = false;             // !< Boolean
+       public $mLatest = false;             // !< Integer (false means "not loaded")
        public $mPreparedEdit = false;           // !< Array
-       public $mRedirectTarget = null;          // !< Title object
-       public $mLastRevision = null;            // !< Revision object
-       public $mTimestamp = '';             // !< String
-       public $mTouched = '19700101000000'; // !< String
-       /**@}}*/
 
        /**
-        * @protected
-        * @var ParserOptions: ParserOptions object for $wgUser articles
+        * @var Title
+        */
+       protected $mRedirectTarget = null;
+
+       /**
+        * @var Revision
         */
-       public $mParserOptions;
+       protected $mLastRevision = null;
+
+       protected $mTimestamp = '';             // !< String
+       protected $mTouched = '19700101000000'; // !< String
+       /**@}}*/
 
        /**
         * Constructor and clear the article
@@ -79,17 +80,16 @@ class WikiPage extends Page {
        /**
         * Constructor from a page id
         *
-        * Always override this for all subclasses (until we use PHP with LSB)
-        *
         * @param $id Int article ID to load
         *
         * @return WikiPage
         */
        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
+               if ( $t ) {
+                       return self::factory( $t );
+               }
+               return null;
        }
 
        /**
@@ -98,6 +98,8 @@ class WikiPage extends Page {
         * (and only when) $wgActions[$action] === true. This allows subclasses
         * to override the default behavior.
         *
+        * @todo: move this UI stuff somewhere else
+        *
         * @return Array
         */
        public function getActionOverrides() {
@@ -202,7 +204,7 @@ class WikiPage extends Page {
                                        return $rt->getFullURL( 'rdfrom=' . urlencode( $source ) );
                                }
                        } else {
-                               if ( $rt->getNamespace() == NS_SPECIAL ) {
+                               if ( $rt->isSpecialPage() ) {
                                        // Gotta handle redirects to special pages differently:
                                        // Fill the HTTP response "Location" header and ignore
                                        // the rest of the page we're on.
@@ -237,7 +239,6 @@ class WikiPage extends Page {
        public function clear() {
                $this->mDataLoaded = false;
 
-               $this->mCounter = -1; # Not loaded
                $this->mRedirectTarget = null; # Title object if set
                $this->mLastRevision = null; # Latest revision
                $this->mTimestamp = '';
@@ -370,15 +371,13 @@ class WikiPage extends Page {
                $lc = LinkCache::singleton();
 
                if ( $data ) {
-                       $lc->addGoodLinkObj( $data->page_id, $this->mTitle,
-                               $data->page_len, $data->page_is_redirect, $data->page_latest );
+                       $lc->addGoodLinkObjFromRow( $this->mTitle, $data );
 
                        $this->mTitle->loadFromRow( $data );
 
                        # Old-fashioned restrictions
                        $this->mTitle->loadRestrictions( $data->page_restrictions );
 
-                       $this->mCounter     = intval( $data->page_counter );
                        $this->mTouched     = wfTimestamp( TS_MW, $data->page_touched );
                        $this->mIsRedirect  = intval( $data->page_is_redirect );
                        $this->mLatest      = intval( $data->page_latest );
@@ -402,7 +401,7 @@ class WikiPage extends Page {
         * @return bool Whether or not the page exists in the database
         */
        public function exists() {
-               return $this->getId() > 0;
+               return $this->mTitle->exists();
        }
 
        /**
@@ -414,29 +413,16 @@ class WikiPage extends Page {
         * @return bool
         */
        public function hasViewableContent() {
-               return $this->exists() || $this->mTitle->isAlwaysKnown();
+               return $this->mTitle->exists() || $this->mTitle->isAlwaysKnown();
        }
 
        /**
+        * Get the number of views of this page
+        *
         * @return int The view count for the page
         */
        public function getCount() {
-               if ( -1 == $this->mCounter ) {
-                       $id = $this->getId();
-
-                       if ( $id == 0 ) {
-                               $this->mCounter = 0;
-                       } else {
-                               $dbr = wfGetDB( DB_SLAVE );
-                               $this->mCounter = $dbr->selectField( 'page',
-                                       'page_counter',
-                                       array( 'page_id' => $id ),
-                                       __METHOD__
-                               );
-                       }
-               }
-
-               return $this->mCounter;
+               return $this->mTitle->getCount();
        }
 
        /**
@@ -665,7 +651,7 @@ class WikiPage extends Page {
                if ( $dbr->implicitGroupby() ) {
                        $realNameField = 'user_real_name';
                } else {
-                       $realNameField = 'FIRST(user_real_name) AS user_real_name';
+                       $realNameField = 'MIN(user_real_name) AS user_real_name';
                }
 
                $tables = array( 'revision', 'user' );
@@ -706,19 +692,59 @@ class WikiPage extends Page {
        /**
         * Should the parser cache be used?
         *
-        * @param $user User The relevant user
+        * @param $parserOptions ParserOptions to check
+        * @param $oldid int
         * @return boolean
         */
-       public function isParserCacheUsed( User $user, $oldid ) {
+       public function isParserCacheUsed( ParserOptions $parserOptions, $oldid ) {
                global $wgEnableParserCache;
 
                return $wgEnableParserCache
-                       && $user->getStubThreshold() == 0
-                       && $this->exists()
-                       && empty( $oldid )
+                       && $parserOptions->getStubThreshold() == 0
+                       && $this->mTitle->exists()
+                       && ( $oldid === null || $oldid === 0 || $oldid === $this->getLatest() )
                        && $this->mTitle->isWikitextPage();
        }
 
+       /**
+        * Get a ParserOutput for the given ParserOptions and revision ID.
+        * The parser cache will be used if possible.
+        *
+        * @since 1.19
+        * @param $parserOptions ParserOptions to use for the parse operation
+        * @param $oldid Revision ID to get the text from, passing null or 0 will
+        *               get the current revision (default value)
+        * @return ParserOutput or false if the revision was not found
+        */
+       public function getParserOutput( ParserOptions $parserOptions, $oldid = null ) {
+               wfProfileIn( __METHOD__ );
+
+               $useParserCache = $this->isParserCacheUsed( $parserOptions, $oldid );
+               wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
+               if ( $parserOptions->getStubThreshold() ) {
+                       wfIncrStats( 'pcache_miss_stub' );
+               }
+
+               if ( $useParserCache ) {
+                       $parserOutput = ParserCache::singleton()->get( $this, $parserOptions );
+                       if ( $parserOutput !== false ) {
+                               wfProfileOut( __METHOD__ );
+                               return $parserOutput;
+                       }
+               }
+
+               if ( $oldid === null || $oldid === 0 ) {
+                       $oldid = $this->getLatest();
+               }
+
+               $pool = new PoolWorkArticleView( $this, $parserOptions, $oldid, $useParserCache );
+               $pool->execute();
+
+               wfProfileOut( __METHOD__ );
+
+               return $pool->getParserOutput();
+       }
+
        /**
         * Perform the actions of a page purging
         */
@@ -744,14 +770,15 @@ class WikiPage extends Page {
                }
 
                if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
-                       if ( $this->getId() == 0 ) {
-                               $text = false;
-                       } else {
+                       if ( $this->mTitle->exists() ) {
                                $text = $this->getRawText();
+                       } else {
+                               $text = false;
                        }
 
                        MessageCache::singleton()->replace( $this->mTitle->getDBkey(), $text );
                }
+               return true;
        }
 
        /**
@@ -763,7 +790,6 @@ class WikiPage extends Page {
         *
         * @param $dbw DatabaseBase
         * @return int The newly created page_id key, or false if the title already existed
-        * @private
         */
        public function insertOn( $dbw ) {
                wfProfileIn( __METHOD__ );
@@ -813,6 +839,7 @@ class WikiPage extends Page {
                wfProfileIn( __METHOD__ );
 
                $text = $revision->getText();
+               $len = strlen( $text );
                $rt = Title::newFromRedirectRecurse( $text );
 
                $conditions = array( 'page_id' => $this->getId() );
@@ -829,7 +856,7 @@ class WikiPage extends Page {
                                'page_touched'     => $dbw->timestamp( $now ),
                                'page_is_new'      => ( $lastRevision === 0 ) ? 1 : 0,
                                'page_is_redirect' => $rt !== null ? 1 : 0,
-                               'page_len'         => strlen( $text ),
+                               'page_len'         => $len,
                        ),
                        $conditions,
                        __METHOD__ );
@@ -837,7 +864,12 @@ class WikiPage extends Page {
                $result = $dbw->affectedRows() != 0;
                if ( $result ) {
                        $this->updateRedirectOn( $dbw, $rt, $lastRevIsRedirect );
+                       $this->setLastEdit( $revision );
                        $this->setCachedLastEditTime( $now );
+                       $this->mLatest = $revision->getId();
+                       $this->mIsRedirect = (bool)$rt;
+                       # Update the LinkCache.
+                       LinkCache::singleton()->addGoodLinkObj( $this->getId(), $this->mTitle, $len, $this->mIsRedirect, $this->mLatest );
                }
 
                wfProfileOut( __METHOD__ );
@@ -946,38 +978,45 @@ class WikiPage extends Page {
        /**
         * @param $section empty/null/false or a section number (0, 1, 2, T1, T2...)
         * @param $text String: new text of the section
-        * @param $summary String: new section's subject, only if $section is 'new'
+        * @param $sectionTitle String: new section's subject, only if $section is 'new'
         * @param $edittime String: revision timestamp or null to use the current revision
         * @return string Complete article text, or null if error
         */
-       public function replaceSection( $section, $text, $summary = '', $edittime = null ) {
+       public function replaceSection( $section, $text, $sectionTitle = '', $edittime = null ) {
                wfProfileIn( __METHOD__ );
 
                if ( strval( $section ) == '' ) {
                        // Whole-page edit; let the whole text through
                } else {
-                       if ( is_null( $edittime ) ) {
-                               $rev = Revision::newFromTitle( $this->mTitle );
+                       // Bug 30711: always use current version when adding a new section
+                       if ( is_null( $edittime ) || $section == 'new' ) {
+                               $oldtext = $this->getRawText();
+                               if ( $oldtext === false ) {
+                                       wfDebug( __METHOD__ . ": no page text\n" );
+                                       return null;
+                               }
                        } else {
                                $dbw = wfGetDB( DB_MASTER );
                                $rev = Revision::loadFromTimestamp( $dbw, $this->mTitle, $edittime );
-                       }
 
-                       if ( !$rev ) {
-                               wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
-                                       $this->getId() . "; section: $section; edittime: $edittime)\n" );
-                               wfProfileOut( __METHOD__ );
-                               return null;
-                       }
+                               if ( !$rev ) {
+                                       wfDebug( "WikiPage::replaceSection asked for bogus section (page: " .
+                                               $this->getId() . "; section: $section; edittime: $edittime)\n" );
+                                       wfProfileOut( __METHOD__ );
+                                       return null;
+                               }
 
-                       $oldtext = $rev->getText();
+                               $oldtext = $rev->getText();
+                       }
 
                        if ( $section == 'new' ) {
                                # Inserting a new section
-                               $subject = $summary ? wfMsgForContent( 'newsectionheaderdefaultlevel', $summary ) . "\n\n" : '';
-                               $text = strlen( trim( $oldtext ) ) > 0
+                               $subject = $sectionTitle ? wfMsgForContent( 'newsectionheaderdefaultlevel', $sectionTitle ) . "\n\n" : '';
+                               if ( wfRunHooks( 'PlaceNewSection', array( $this, $oldtext, $subject, &$text ) ) ) {
+                                       $text = strlen( trim( $oldtext ) ) > 0
                                                ? "{$oldtext}\n\n{$subject}{$text}"
                                                : "{$subject}{$text}";
+                               }
                        } else {
                                # Replacing an existing section; roll out the big guns
                                global $wgParser;
@@ -1067,7 +1106,7 @@ class WikiPage extends Page {
                $status = Status::newGood( array() );
 
                # Load $this->mTitle->getArticleID() and $this->mLatest if it's not already
-               $this->loadPageData();
+               $this->loadPageData( 'fromdbmaster' );
 
                $flags = $this->checkFlags( $flags );
 
@@ -1090,6 +1129,8 @@ class WikiPage extends Page {
 
                $oldtext = $this->getRawText(); // current revision
                $oldsize = strlen( $oldtext );
+               $oldid = $this->getLatest();
+               $oldIsRedirect = $this->isRedirect();
                $oldcountable = $this->isCountable();
 
                # Provide autosummaries if one is not provided and autosummaries are enabled.
@@ -1119,7 +1160,7 @@ class WikiPage extends Page {
                                'comment'    => $summary,
                                'minor_edit' => $isminor,
                                'text'       => $text,
-                               'parent_id'  => $this->mLatest,
+                               'parent_id'  => $oldid,
                                'user'       => $user->getId(),
                                'user_text'  => $user->getName(),
                                'timestamp'  => $now
@@ -1147,7 +1188,7 @@ class WikiPage extends Page {
                                # edit conflicts reliably, either by $ok here, or by $article->getTimestamp()
                                # before this function is called. A previous function used a separate query, this
                                # creates a window where concurrent edits can cause an ignored edit conflict.
-                               $ok = $this->updateRevisionOn( $dbw, $revision, $this->mLatest );
+                               $ok = $this->updateRevisionOn( $dbw, $revision, $oldid, $oldIsRedirect );
 
                                if ( !$ok ) {
                                        /* Belated edit conflict! Run away!! */
@@ -1170,7 +1211,7 @@ class WikiPage extends Page {
                                                        $this->mTitle->getUserPermissionsErrors( 'autopatrol', $user ) );
                                                # Add RC row to the DB
                                                $rc = RecentChange::notifyEdit( $now, $this->mTitle, $isminor, $user, $summary,
-                                                       $this->mLatest, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
+                                                       $oldid, $this->getTimestamp(), $bot, '', $oldsize, $newsize,
                                                        $revisionId, $patrolled
                                                );
 
@@ -1237,11 +1278,6 @@ class WikiPage extends Page {
                        ) );
                        $revisionId = $revision->insertOn( $dbw );
 
-                       $this->mTitle->resetArticleID( $newid );
-                       # Update the LinkCache. Resetting the Title ArticleID means it will rely on having that already cached
-                       # @todo FIXME?
-                       LinkCache::singleton()->addGoodLinkObj( $newid, $this->mTitle, strlen( $text ), (bool)Title::newFromRedirect( $text ), $revisionId );
-
                        # Update the page record with revision data
                        $this->updateRevisionOn( $dbw, $revision, 0 );
 
@@ -1275,7 +1311,7 @@ class WikiPage extends Page {
 
                # Do updates right now unless deferral was requested
                if ( !( $flags & EDIT_DEFER_UPDATES ) ) {
-                       wfDoUpdates();
+                       DeferredUpdates::doUpdates();
                }
 
                // Return the new revision (or null) to the caller
@@ -1293,6 +1329,7 @@ class WikiPage extends Page {
 
        /**
         * Update the article's restriction field, and leave a log entry.
+        * This works for protection both existing and non-existing pages.
         *
         * @param $limit Array: set of restriction keys
         * @param $reason String
@@ -1301,30 +1338,16 @@ class WikiPage extends Page {
         * @param $user User The user updating the restrictions
         * @return bool true on success
         */
-       public function updateRestrictions(
-               $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
-       ) {
-               global $wgUser, $wgContLang;
-               $user = is_null( $user ) ? $wgUser : $user;
-
-               $restrictionTypes = $this->mTitle->getRestrictionTypes();
-
-               $id = $this->mTitle->getArticleID();
-
-               if ( $id <= 0 ) {
-                       wfDebug( "updateRestrictions failed: article id $id <= 0\n" );
-                       return false;
-               }
+       public function doUpdateRestrictions( array $limit, array $expiry, &$cascade, $reason, User $user ) {
+               global $wgContLang;
 
                if ( wfReadOnly() ) {
-                       wfDebug( "updateRestrictions failed: read-only\n" );
-                       return false;
+                       return Status::newFatal( 'readonlytext', wfReadOnlyReason() );
                }
 
-               if ( count( $this->mTitle->getUserPermissionsErrors( 'protect', $user ) ) ) {
-                       wfDebug( "updateRestrictions failed: insufficient permissions\n" );
-                       return false;
-               }
+               $restrictionTypes = $this->mTitle->getRestrictionTypes();
+
+               $id = $this->mTitle->getArticleID();
 
                if ( !$cascade ) {
                        $cascade = false;
@@ -1335,151 +1358,182 @@ class WikiPage extends Page {
 
                # @todo FIXME: Same limitations as described in ProtectionForm.php (line 37);
                # we expect a single selection, but the schema allows otherwise.
-               $current = array();
-               $updated = self::flattenRestrictions( $limit );
+               $isProtected = false;
+               $protect = false;
                $changed = false;
 
+               $dbw = wfGetDB( DB_MASTER );
+
                foreach ( $restrictionTypes as $action ) {
-                       if ( isset( $expiry[$action] ) ) {
-                               # Get current restrictions on $action
-                               $aLimits = $this->mTitle->getRestrictions( $action );
-                               $current[$action] = implode( '', $aLimits );
-                               # Are any actual restrictions being dealt with here?
-                               $aRChanged = count( $aLimits ) || !empty( $limit[$action] );
-
-                               # If something changed, we need to log it. Checking $aRChanged
-                               # assures that "unprotecting" a page that is not protected does
-                               # not log just because the expiry was "changed".
-                               if ( $aRChanged &&
-                                       $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] )
-                               {
+                       if ( !isset( $expiry[$action] ) ) {
+                               $expiry[$action] = $dbw->getInfinity();
+                       }
+                       if ( !isset( $limit[$action] ) ) {
+                               $limit[$action] = '';
+                       } elseif ( $limit[$action] != '' ) {
+                               $protect = true;
+                       }
+
+                       # Get current restrictions on $action
+                       $current = implode( '', $this->mTitle->getRestrictions( $action ) );
+                       if ( $current != '' ) {
+                               $isProtected = true;
+                       }
+
+                       if ( $limit[$action] != $current ) {
+                               $changed = true;
+                       } elseif ( $limit[$action] != '' ) {
+                               # Only check expiry change if the action is actually being
+                               # protected, since expiry does nothing on an not-protected
+                               # action.
+                               if ( $this->mTitle->getRestrictionExpiry( $action ) != $expiry[$action] ) {
                                        $changed = true;
                                }
                        }
                }
 
-               $current = self::flattenRestrictions( $current );
-
-               $changed = ( $changed || $current != $updated );
-               $changed = $changed || ( $updated && $this->mTitle->areRestrictionsCascading() != $cascade );
-               $protect = ( $updated != '' );
+               if ( !$changed && $protect && $this->mTitle->areRestrictionsCascading() != $cascade ) {
+                       $changed = true;
+               }
 
                # If nothing's changed, do nothing
-               if ( $changed ) {
-                       if ( wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
-                               $dbw = wfGetDB( DB_MASTER );
+               if ( !$changed ) {
+                       return Status::newGood();
+               }
 
-                               # Prepare a null revision to be added to the history
-                               $modified = $current != '' && $protect;
+               if ( !$protect ) { # No protection at all means unprotection
+                       $revCommentMsg = 'unprotectedarticle';
+                       $logAction = 'unprotect';
+               } elseif ( $isProtected ) {
+                       $revCommentMsg = 'modifiedarticleprotection';
+                       $logAction = 'modify';
+               } else {
+                       $revCommentMsg = 'protectedarticle';
+                       $logAction = 'protect';
+               }
 
-                               if ( $protect ) {
-                                       $comment_type = $modified ? 'modifiedarticleprotection' : 'protectedarticle';
+               $encodedExpiry = array();
+               $protectDescription = '';
+               foreach ( $limit as $action => $restrictions ) {
+                       $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
+                       if ( $restrictions != '' ) {
+                               $protectDescription .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
+                               if ( $encodedExpiry[$action] != 'infinity' ) {
+                                       $protectDescription .= wfMsgForContent( 'protect-expiring',
+                                               $wgContLang->timeanddate( $expiry[$action], false, false ) ,
+                                               $wgContLang->date( $expiry[$action], false, false ) ,
+                                               $wgContLang->time( $expiry[$action], false, false ) );
                                } else {
-                                       $comment_type = 'unprotectedarticle';
-                               }
-
-                               $comment = $wgContLang->ucfirst( wfMsgForContent( $comment_type, $this->mTitle->getPrefixedText() ) );
-
-                               # Only restrictions with the 'protect' right can cascade...
-                               # Otherwise, people who cannot normally protect can "protect" pages via transclusion
-                               $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
-
-                               # The schema allows multiple restrictions
-                               if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
-                                       $cascade = false;
+                                       $protectDescription .= wfMsgForContent( 'protect-expiry-indefinite' );
                                }
 
-                               $cascade_description = '';
+                               $protectDescription .= ') ';
+                       }
+               }
+               $protectDescription = trim( $protectDescription );
 
-                               if ( $cascade ) {
-                                       $cascade_description = ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
-                               }
+               if ( $id ) { # Protection of existing page
+                       if ( !wfRunHooks( 'ArticleProtect', array( &$this, &$user, $limit, $reason ) ) ) {
+                               return Status::newGood();
+                       }
 
-                               if ( $reason ) {
-                                       $comment .= ": $reason";
-                               }
+                       # Only restrictions with the 'protect' right can cascade...
+                       # Otherwise, people who cannot normally protect can "protect" pages via transclusion
+                       $editrestriction = isset( $limit['edit'] ) ? array( $limit['edit'] ) : $this->mTitle->getRestrictions( 'edit' );
 
-                               $editComment = $comment;
-                               $encodedExpiry = array();
-                               $protect_description = '';
-                               foreach ( $limit as $action => $restrictions ) {
-                                       if ( !isset( $expiry[$action] ) )
-                                               $expiry[$action] = $dbw->getInfinity();
-
-                                       $encodedExpiry[$action] = $dbw->encodeExpiry( $expiry[$action] );
-                                       if ( $restrictions != '' ) {
-                                               $protect_description .= $wgContLang->getDirMark() . "[$action=$restrictions] (";
-                                               if ( $encodedExpiry[$action] != 'infinity' ) {
-                                                       $protect_description .= wfMsgForContent( 'protect-expiring',
-                                                               $wgContLang->timeanddate( $expiry[$action], false, false ) ,
-                                                               $wgContLang->date( $expiry[$action], false, false ) ,
-                                                               $wgContLang->time( $expiry[$action], false, false ) );
-                                               } else {
-                                                       $protect_description .= wfMsgForContent( 'protect-expiry-indefinite' );
-                                               }
+                       # The schema allows multiple restrictions
+                       if ( !in_array( 'protect', $editrestriction ) && !in_array( 'sysop', $editrestriction ) ) {
+                               $cascade = false;
+                       }
 
-                                               $protect_description .= ') ';
-                                       }
+                       # Update restrictions table
+                       foreach ( $limit as $action => $restrictions ) {
+                               if ( $restrictions != '' ) {
+                                       $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
+                                               array( 'pr_page' => $id,
+                                                       'pr_type' => $action,
+                                                       'pr_level' => $restrictions,
+                                                       'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
+                                                       'pr_expiry' => $encodedExpiry[$action]
+                                               ),
+                                               __METHOD__
+                                       );
+                               } else {
+                                       $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
+                                               'pr_type' => $action ), __METHOD__ );
                                }
-                               $protect_description = trim( $protect_description );
+                       }
 
-                               if ( $protect_description && $protect ) {
-                                       $editComment .= " ($protect_description)";
-                               }
+                       # Prepare a null revision to be added to the history
+                       $editComment = $wgContLang->ucfirst( wfMsgForContent( $revCommentMsg, $this->mTitle->getPrefixedText() ) );
+                       if ( $reason ) {
+                               $editComment .= ": $reason";
+                       }
+                       if ( $protectDescription ) {
+                               $editComment .= " ($protectDescription)";
+                       }
+                       if ( $cascade ) {
+                               $editComment .= ' [' . wfMsgForContent( 'protect-summary-cascade' ) . ']';
+                       }
 
-                               if ( $cascade ) {
-                                       $editComment .= "$cascade_description";
-                               }
+                       # Insert a null revision
+                       $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
+                       $nullRevId = $nullRevision->insertOn( $dbw );
+
+                       $latest = $this->getLatest();
+                       # Update page record
+                       $dbw->update( 'page',
+                               array( /* SET */
+                                       'page_touched' => $dbw->timestamp(),
+                                       'page_restrictions' => '',
+                                       'page_latest' => $nullRevId
+                               ), array( /* WHERE */
+                                       'page_id' => $id
+                               ), __METHOD__
+                       );
 
-                               # Update restrictions table
-                               foreach ( $limit as $action => $restrictions ) {
-                                       if ( $restrictions != '' ) {
-                                               $dbw->replace( 'page_restrictions', array( array( 'pr_page', 'pr_type' ) ),
-                                                       array( 'pr_page' => $id,
-                                                               'pr_type' => $action,
-                                                               'pr_level' => $restrictions,
-                                                               'pr_cascade' => ( $cascade && $action == 'edit' ) ? 1 : 0,
-                                                               'pr_expiry' => $encodedExpiry[$action]
-                                                       ),
-                                                       __METHOD__
-                                               );
-                                       } else {
-                                               $dbw->delete( 'page_restrictions', array( 'pr_page' => $id,
-                                                       'pr_type' => $action ), __METHOD__ );
-                                       }
-                               }
+                       wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
+                       wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
+               } else { # Protection of non-existing page (also known as "title protection")
+                       # Cascade protection is meaningless in this case
+                       $cascade = false;
 
-                               # Insert a null revision
-                               $nullRevision = Revision::newNullRevision( $dbw, $id, $editComment, true );
-                               $nullRevId = $nullRevision->insertOn( $dbw );
-
-                               $latest = $this->getLatest();
-                               # Update page record
-                               $dbw->update( 'page',
-                                       array( /* SET */
-                                               'page_touched' => $dbw->timestamp(),
-                                               'page_restrictions' => '',
-                                               'page_latest' => $nullRevId
-                                       ), array( /* WHERE */
-                                               'page_id' => $id
+                       if ( $limit['create'] != '' ) {
+                               $dbw->replace( 'protected_titles',
+                                       array( array( 'pt_namespace', 'pt_title' ) ),
+                                       array(
+                                               'pt_namespace' => $this->mTitle->getNamespace(),
+                                               'pt_title' => $this->mTitle->getDBkey(),
+                                               'pt_create_perm' => $limit['create'],
+                                               'pt_timestamp' => $dbw->encodeExpiry( wfTimestampNow() ),
+                                               'pt_expiry' => $encodedExpiry['create'],
+                                               'pt_user' => $user->getId(),
+                                               'pt_reason' => $reason,
                                        ), __METHOD__
                                );
+                       } else {
+                               $dbw->delete( 'protected_titles',
+                                       array(
+                                               'pt_namespace' => $this->mTitle->getNamespace(),
+                                               'pt_title' => $this->mTitle->getDBkey()
+                                       ), __METHOD__
+                               );
+                       }
+               }
 
-                               wfRunHooks( 'NewRevisionFromEditComplete', array( $this, $nullRevision, $latest, $user ) );
-                               wfRunHooks( 'ArticleProtectComplete', array( &$this, &$user, $limit, $reason ) );
+               $this->mTitle->flushRestrictions();
 
-                               # Update the protection log
-                               $log = new LogPage( 'protect' );
-                               if ( $protect ) {
-                                       $params = array( $protect_description, $cascade ? 'cascade' : '' );
-                                       $log->addEntry( $modified ? 'modify' : 'protect', $this->mTitle, trim( $reason ), $params );
-                               } else {
-                                       $log->addEntry( 'unprotect', $this->mTitle, $reason );
-                               }
-                       } # End hook
-               } # End "changed" check
+               if ( $logAction == 'unprotect' ) {
+                       $logParams = array();
+               } else {
+                       $logParams = array( $protectDescription, $cascade ? 'cascade' : '' );
+               }
 
-               return true;
+               # Update the protection log
+               $log = new LogPage( 'protect' );
+               $log->addEntry( $logAction, $this->mTitle, trim( $reason ), $logParams, $user );
+
+               return Status::newGood();
        }
 
        /**
@@ -1525,10 +1579,6 @@ class WikiPage extends Page {
         */
        public function estimateRevisionCount() {
                $dbr = wfGetDB( DB_SLAVE );
-
-               // For an exact count...
-               // return $dbr->selectField( 'revision', 'COUNT(*)',
-               //      array( 'rev_page' => $this->getId() ), __METHOD__ );
                return $dbr->estimateRowCount( 'revision', '*',
                        array( 'rev_page' => $this->getId() ), __METHOD__ );
        }
@@ -1590,7 +1640,7 @@ class WikiPage extends Page {
         * Deletes the article with database consistency, writes logs, purges caches
         *
         * @param $reason string delete reason for deletion log
-        * @param suppress bitfield
+        * @param $suppress bitfield
         *      Revision::DELETED_TEXT
         *      Revision::DELETED_COMMENT
         *      Revision::DELETED_USER
@@ -1604,7 +1654,7 @@ class WikiPage extends Page {
        public function doDeleteArticle(
                $reason, $suppress = false, $id = 0, $commit = true, &$error = '', User $user = null
        ) {
-               global $wgDeferredUpdateList, $wgUseTrackbacks, $wgEnableInterwikiTemplatesTracking, $wgGlobalDatabase, $wgUser;
+               global $wgUser;
                $user = is_null( $user ) ? $wgUser : $user;
 
                wfDebug( __METHOD__ . "\n" );
@@ -1620,8 +1670,9 @@ class WikiPage extends Page {
                        return false;
                }
 
-               $u = new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 );
-               array_push( $wgDeferredUpdateList, $u );
+               DeferredUpdates::addUpdate(
+                       new SiteStatsUpdate( 0, 1, - (int)$this->isCountable(), -1 )
+               );
 
                // Bitfields to further suppress the content
                if ( $suppress ) {
@@ -1662,7 +1713,8 @@ class WikiPage extends Page {
                                'ar_flags'      => '\'\'', // MySQL's "strict mode"...
                                'ar_len'        => 'rev_len',
                                'ar_page_id'    => 'page_id',
-                               'ar_deleted'    => $bitfield
+                               'ar_deleted'    => $bitfield,
+                               'ar_sha1'       => 'rev_sha1'
                        ), array(
                                'page_id' => $id,
                                'page_id = rev_page'
@@ -1695,10 +1747,6 @@ class WikiPage extends Page {
                if ( !$dbw->cascadingDeletes() ) {
                        $dbw->delete( 'revision', array( 'rev_page' => $id ), __METHOD__ );
 
-                       if ( $wgUseTrackbacks ) {
-                               $dbw->delete( 'trackbacks', array( 'tb_page' => $id ), __METHOD__ );
-                       }
-
                        # Delete outgoing links
                        $dbw->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
                        $dbw->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
@@ -1709,14 +1757,6 @@ class WikiPage extends Page {
                        $dbw->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
                        $dbw->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
                        $dbw->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
-
-                       if ( $wgEnableInterwikiTemplatesTracking && $wgGlobalDatabase ) {
-                               $dbw2 = wfGetDB( DB_MASTER, array(), $wgGlobalDatabase );
-                               $dbw2->delete( 'globaltemplatelinks',
-                                                       array(  'gtl_from_wiki' => wfGetID(),
-                                                                       'gtl_from_page' => $id )
-                                                       );
-               }
                }
 
                # If using cleanup triggers, we can skip some manual deletes
@@ -1740,10 +1780,13 @@ class WikiPage extends Page {
 
                # Log the deletion, if the page was suppressed, log it at Oversight instead
                $logtype = $suppress ? 'suppress' : 'delete';
-               $log = new LogPage( $logtype );
 
-               # Make sure logging got through
-               $log->addEntry( 'delete', $this->mTitle, $reason, array() );
+               $logEntry = new ManualLogEntry( $logtype, 'delete' );
+               $logEntry->setPerformer( $user );
+               $logEntry->setTarget( $this->mTitle );
+               $logEntry->setComment( $reason );
+               $logid = $logEntry->insert();
+               $logEntry->publish( $logid );
 
                if ( $commit ) {
                        $dbw->commit();
@@ -1759,6 +1802,8 @@ class WikiPage extends Page {
         * roll back to, e.g. user is the sole contributor. This function
         * performs permissions checks on $user, then calls commitRollback()
         * to do the dirty work
+        * 
+        * @todo: seperate the business/permission stuff out from backend code
         *
         * @param $fromP String: Name of the user whose edits to rollback.
         * @param $summary String: Custom summary. Set to default summary if empty.
@@ -1939,15 +1984,15 @@ class WikiPage extends Page {
         * @param $user User The relevant user
         */
        public function doViewUpdates( User $user ) {
-               global $wgDeferredUpdateList, $wgDisableCounters;
+               global $wgDisableCounters;
                if ( wfReadOnly() ) {
                        return;
                }
 
                # Don't update page view counters on views from bot users (bug 14044)
-               if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->getId() ) {
-                       $wgDeferredUpdateList[] = new ViewCountUpdate( $this->getId() );
-                       $wgDeferredUpdateList[] = new SiteStatsUpdate( 1, 0, 0 );
+               if ( !$wgDisableCounters && !$user->isAllowed( 'bot' ) && $this->mTitle->exists() ) {
+                       DeferredUpdates::addUpdate( new ViewCountUpdate( $this->getId() ) );
+                       DeferredUpdates::addUpdate( new SiteStatsUpdate( 1, 0, 0 ) );
                }
 
                # Update newtalk / watchlist notification status
@@ -1959,7 +2004,7 @@ class WikiPage extends Page {
         * Returns a stdclass with source, pst and output members
         */
        public function prepareTextForEdit( $text, $revid = null, User $user = null ) {
-               global $wgParser, $wgUser;
+               global $wgParser, $wgContLang, $wgUser;
                $user = is_null( $user ) ? $wgUser : $user;
                // @TODO fixme: check $user->getId() here???
                if ( $this->mPreparedEdit
@@ -1970,15 +2015,26 @@ class WikiPage extends Page {
                        return $this->mPreparedEdit;
                }
 
-               $popts = ParserOptions::newFromUser( $user );
+               $popts = ParserOptions::newFromUserAndLang( $user, $wgContLang );
                wfRunHooks( 'ArticlePrepareTextForEdit', array( $this, $popts ) );
 
                $edit = (object)array();
                $edit->revid = $revid;
                $edit->newText = $text;
-               $edit->pst = $this->preSaveTransform( $text, $user, $popts );
-               $edit->popts = $this->getParserOptions( true );
-               $edit->output = $wgParser->parse( $edit->pst, $this->mTitle, $edit->popts, true, true, $revid );
+               $edit->pst = $wgParser->preSaveTransform( $text, $this->mTitle, $user, $popts );
+               $edit->popts = $this->makeParserOptions( 'canonical' );
+
+               // Bug 32858: For a CSS/JS page, put a blank parser output into the 
+               // prepared edit, so that links etc. won't be registered in the 
+               // database. We could have set $edit->output to false or something if 
+               // we thought of this bug earlier, but now that would break the 
+               // interface with AbuseFilter etc.
+               if ( $this->mTitle->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
+                       $input = '';
+               } else {
+                       $input = $edit->pst;
+               }
+               $edit->output = $wgParser->parse( $input, $this->mTitle, $edit->popts, true, true, $revid );
                $edit->oldText = $this->getRawText();
 
                $this->mPreparedEdit = $edit;
@@ -2004,7 +2060,7 @@ class WikiPage extends Page {
         *   - null: don't change the article count
         */
        public function doEditUpdates( Revision $revision, User $user, array $options = array() ) {
-               global $wgDeferredUpdateList, $wgEnableParserCache;
+               global $wgEnableParserCache;
 
                wfProfileIn( __METHOD__ );
 
@@ -2049,15 +2105,15 @@ class WikiPage extends Page {
                        }
                }
 
-               $id = $this->getId();
-               $title = $this->mTitle->getPrefixedDBkey();
-               $shortTitle = $this->mTitle->getDBkey();
-
-               if ( 0 == $id ) {
+               if ( !$this->mTitle->exists() ) {
                        wfProfileOut( __METHOD__ );
                        return;
                }
 
+               $id = $this->getId();
+               $title = $this->mTitle->getPrefixedDBkey();
+               $shortTitle = $this->mTitle->getDBkey();
+
                if ( !$options['changed'] ) {
                        $good = 0;
                        $total = 0;
@@ -2072,8 +2128,8 @@ class WikiPage extends Page {
                        $total = 0;
                }
 
-               $wgDeferredUpdateList[] = new SiteStatsUpdate( 0, 1, $good, $total );
-               $wgDeferredUpdateList[] = new SearchUpdate( $id, $title, $text );
+               DeferredUpdates::addUpdate( new SiteStatsUpdate( 0, 1, $good, $total ) );
+               DeferredUpdates::addUpdate( new SearchUpdate( $id, $title, $text ) );
 
                # If this is another user's talk page, update newtalk.
                # Don't do this if $options['changed'] = false (null-edits) nor if
@@ -2122,6 +2178,7 @@ class WikiPage extends Page {
         * @deprecated since 1.18, use doEditUpdates()
         */
        public function createUpdates( $rev ) {
+               wfDeprecated( __METHOD__, '1.18' );
                global $wgUser;
                $this->doEditUpdates( $rev, $wgUser, array( 'created' => true ) );
        }
@@ -2130,6 +2187,7 @@ class WikiPage extends Page {
         * This function is called right before saving the wikitext,
         * so we can do things like signatures and links-in-context.
         *
+        * @deprecated in 1.19; use Parser::preSaveTransform() instead
         * @param $text String article contents
         * @param $user User object: user doing the edit
         * @param $popts ParserOptions object: parser options, default options for
@@ -2139,6 +2197,9 @@ class WikiPage extends Page {
         */
        public function preSaveTransform( $text, User $user = null, ParserOptions $popts = null ) {
                global $wgParser, $wgUser;
+
+               wfDeprecated( __METHOD__, '1.19' );
+
                $user = is_null( $user ) ? $wgUser : $user;
 
                if ( $popts === null ) {
@@ -2221,8 +2282,6 @@ class WikiPage extends Page {
         * @param $title Title object
         */
        public static function onArticleCreate( $title ) {
-               global $wgDeferredUpdateList;
-
                # Update existence markers on article/talk tabs...
                if ( $title->isTalkPage() ) {
                        $other = $title->getSubjectPage();
@@ -2236,9 +2295,6 @@ class WikiPage extends Page {
                $title->touchLinks();
                $title->purgeSquid();
                $title->deleteTitleProtection();
-
-               # Invalidate caches of distant articles which transclude this page
-               $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'globaltemplatelinks' );
        }
 
        /**
@@ -2247,8 +2303,6 @@ class WikiPage extends Page {
         * @param $title Title
         */
        public static function onArticleDelete( $title ) {
-               global $wgDeferredUpdateList;
-
                # Update existence markers on article/talk tabs...
                if ( $title->isTalkPage() ) {
                        $other = $title->getSubjectPage();
@@ -2279,14 +2333,13 @@ class WikiPage extends Page {
                # User talk pages
                if ( $title->getNamespace() == NS_USER_TALK ) {
                        $user = User::newFromName( $title->getText(), false );
-                       $user->setNewtalk( false );
+                       if ( $user ) {
+                               $user->setNewtalk( false );
+                       }
                }
 
                # Image redirects
                RepoGroup::singleton()->getLocalRepo()->invalidateImageRedirect( $title );
-
-               # Invalidate caches of distant articles which transclude this page
-               $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'globaltemplatelinks' );
        }
 
        /**
@@ -2296,16 +2349,12 @@ class WikiPage extends Page {
         * @todo:  verify that $title is always a Title object (and never false or null), add Title hint to parameter $title
         */
        public static function onArticleEdit( $title ) {
-               global $wgDeferredUpdateList;
-
                // Invalidate caches of articles which include this page
-               $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'templatelinks' );
+               DeferredUpdates::addHTMLCacheUpdate( $title, 'templatelinks' );
 
-               // Invalidate caches of distant articles which transclude this page
-               $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'globaltemplatelinks' );
 
                // Invalidate the caches of all pages which redirect here
-               $wgDeferredUpdateList[] = new HTMLCacheUpdate( $title, 'redirect' );
+               DeferredUpdates::addHTMLCacheUpdate( $title, 'redirect' );
 
                # Purge squid for this page only
                $title->purgeSquid();
@@ -2345,40 +2394,6 @@ class WikiPage extends Page {
                return $result;
        }
 
-       /**
-        * Return a list of distant templates used by this article.
-        * Uses the globaltemplatelinks table
-        *
-        * @return Array of Title objects
-        */
-       public function getUsedDistantTemplates() {
-               global $wgGlobalDatabase;
-
-               $result = array();
-
-               if ( $wgGlobalDatabase ) {
-                       $id = $this->mTitle->getArticleID();
-
-                       if ( $id == 0 ) {
-                               return array();
-                       }
-
-                       $dbr = wfGetDB( DB_SLAVE, array(), $wgGlobalDatabase );
-                       $res = $dbr->select( 'globaltemplatelinks',
-                               array( 'gtl_to_prefix', 'gtl_to_namespace', 'gtl_to_title' ),
-                               array( 'gtl_from_wiki' => wfWikiID( ), 'gtl_from_page' => $id ),
-                               __METHOD__ );
-
-                       if ( $res !== false ) {
-                               foreach ( $res as $row ) {
-                                       $result[] = Title::makeTitle( $row->gtl_to_namespace, $row->gtl_to_title, null, $row->gtl_to_prefix );
-                               }
-                       }
-               }
-
-               return $result;
-       }
-
        /**
         * Returns a list of hidden categories this page is a member of.
         * Uses the page_props and categorylinks tables.
@@ -2558,37 +2573,18 @@ class WikiPage extends Page {
                return $reason;
        }
 
-       /**
-        * Get parser options suitable for rendering the primary article wikitext
-        * @param $canonical boolean Determines that the generated options must not depend on user preferences (see bug 14404)
-        * @return mixed ParserOptions object or boolean false
-        */
-       public function getParserOptions( $canonical = false ) {
-               global $wgUser, $wgLanguageCode;
-
-               if ( !$this->mParserOptions || $canonical ) {
-                       $user = !$canonical ? $wgUser : new User;
-                       $parserOptions = new ParserOptions( $user );
-                       $parserOptions->setTidy( true );
-                       $parserOptions->enableLimitReport();
-
-                       if ( $canonical ) {
-                               $parserOptions->setUserLang( $wgLanguageCode ); # Must be set explicitely
-                               return $parserOptions;
-                       }
-                       $this->mParserOptions = $parserOptions;
-               }
-               // Clone to allow modifications of the return value without affecting cache
-               return clone $this->mParserOptions;
-       }
-
        /**
        * Get parser options suitable for rendering the primary article wikitext
-       * @param User $user
+       * @param User|string $user User object or 'canonical'
        * @return ParserOptions
        */
-       public function makeParserOptions( User $user ) {
-               $options = ParserOptions::newFromUser( $user );
+       public function makeParserOptions( $user ) {
+               global $wgContLang;
+               if ( $user instanceof User ) { // settings per user (even anons)
+                       $options = ParserOptions::newFromUser( $user );
+               } else { // canonical settings
+                       $options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
+               }
                $options->enableLimitReport(); // show inclusion/loop reports
                $options->setTidy( true ); // fix bad HTML
                return $options;
@@ -2661,7 +2657,7 @@ class WikiPage extends Page {
         * Updates cascading protections
         *
         * @param $parserOutput ParserOutput object for the current version
-        **/
+        */
        public function doCascadeProtectionUpdates( ParserOutput $parserOutput ) {
                if ( wfReadOnly() || !$this->mTitle->areRestrictionsCascading() ) {
                        return;
@@ -2708,27 +2704,230 @@ class WikiPage extends Page {
                }
        }
 
-       /*
-       * @deprecated since 1.18
-       */
+       /**
+        * Update the article's restriction field, and leave a log entry.
+        *
+        * @deprecated since 1.19
+        * @param $limit Array: set of restriction keys
+        * @param $reason String
+        * @param &$cascade Integer. Set to false if cascading protection isn't allowed.
+        * @param $expiry Array: per restriction type expiration
+        * @param $user User The user updating the restrictions
+        * @return bool true on success
+        */
+       public function updateRestrictions(
+               $limit = array(), $reason = '', &$cascade = 0, $expiry = array(), User $user = null
+       ) {
+               global $wgUser;
+
+               $user = is_null( $user ) ? $wgUser : $user;
+
+               return $this->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user )->isOK();
+       }
+
+       /**
+        * @deprecated since 1.18
+        */
        public function quickEdit( $text, $comment = '', $minor = 0 ) {
+               wfDeprecated( __METHOD__, '1.18' );
                global $wgUser;
                return $this->doQuickEdit( $text, $wgUser, $comment, $minor );
        }
 
-       /*
-       * @deprecated since 1.18
-       */
+       /**
+        * @deprecated since 1.18
+        */
        public function viewUpdates() {
+               wfDeprecated( __METHOD__, '1.18' );
                global $wgUser;
                return $this->doViewUpdates( $wgUser );
        }
 
-       /*
-       * @deprecated since 1.18
-       */
+       /**
+        * @deprecated since 1.18
+        */
        public function useParserCache( $oldid ) {
+               wfDeprecated( __METHOD__, '1.18' );
                global $wgUser;
-               return $this->isParserCacheUsed( $wgUser, $oldid );
+               return $this->isParserCacheUsed( ParserOptions::newFromUser( $wgUser ), $oldid );
+       }
+}
+
+class PoolWorkArticleView extends PoolCounterWork {
+
+       /**
+        * @var Page
+        */
+       private $page;
+
+       /**
+        * @var string
+        */
+       private $cacheKey;
+
+       /**
+        * @var integer
+        */
+       private $revid;
+
+       /**
+        * @var ParserOptions
+        */
+       private $parserOptions;
+
+       /**
+        * @var string|null
+        */
+       private $text;
+
+       /**
+        * @var ParserOutput|false
+        */
+       private $parserOutput = false;
+
+       /**
+        * @var bool
+        */
+       private $isDirty = false;
+
+       /**
+        * @var Status|false
+        */
+       private $error = false;
+
+       /**
+        * Constructor
+        *
+        * @param $page Page
+        * @param $revid Integer: ID of the revision being parsed
+        * @param $useParserCache Boolean: whether to use the parser cache
+        * @param $parserOptions parserOptions to use for the parse operation
+        * @param $text String: text to parse or null to load it
+        */
+       function __construct( Page $page, ParserOptions $parserOptions, $revid, $useParserCache, $text = null ) {
+               $this->page = $page;
+               $this->revid = $revid;
+               $this->cacheable = $useParserCache;
+               $this->parserOptions = $parserOptions;
+               $this->text = $text;
+               $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
+               parent::__construct( 'ArticleView', $this->cacheKey . ':revid:' . $revid );
+       }
+
+       /**
+        * Get the ParserOutput from this object, or false in case of failure
+        *
+        * @return ParserOutput
+        */
+       public function getParserOutput() {
+               return $this->parserOutput;
+       }
+
+       /**
+        * Get whether the ParserOutput is a dirty one (i.e. expired)
+        *
+        * @return bool
+        */
+       public function getIsDirty() {
+               return $this->isDirty;
+       }
+
+       /**
+        * Get a Status object in case of error or false otherwise
+        *
+        * @return Status|false
+        */
+       public function getError() {
+               return $this->error;
+       }
+
+       /**
+        * @return bool
+        */
+       function doWork() {
+               global $wgParser, $wgUseFileCache;
+
+               $isCurrent = $this->revid === $this->page->getLatest();
+
+               if ( $this->text !== null ) {
+                       $text = $this->text;
+               } elseif ( $isCurrent ) {
+                       $text = $this->page->getRawText();
+               } else {
+                       $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );
+                       if ( $rev === null ) {
+                               return false;
+                       }
+                       $text = $rev->getText();
+               }
+
+               $time = - wfTime();
+               $this->parserOutput = $wgParser->parse( $text, $this->page->getTitle(),
+                       $this->parserOptions, true, true, $this->revid );
+               $time += wfTime();
+
+               # Timing hack
+               if ( $time > 3 ) {
+                       wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
+                               $this->page->getTitle()->getPrefixedDBkey() ) );
+               }
+
+               if ( $this->cacheable && $this->parserOutput->isCacheable() ) {
+                       ParserCache::singleton()->save( $this->parserOutput, $this->page, $this->parserOptions );
+               }
+
+               // Make sure file cache is not used on uncacheable content.
+               // Output that has magic words in it can still use the parser cache
+               // (if enabled), though it will generally expire sooner.
+               if ( !$this->parserOutput->isCacheable() || $this->parserOutput->containsOldMagic() ) {
+                       $wgUseFileCache = false;
+               }
+
+               if ( $isCurrent ) {
+                       $this->page->doCascadeProtectionUpdates( $this->parserOutput );
+               }
+
+               return true;
+       }
+
+       /**
+        * @return bool
+        */
+       function getCachedWork() {
+               $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );
+
+               if ( $this->parserOutput === false ) {
+                       wfDebug( __METHOD__ . ": parser cache miss\n" );
+                       return false;
+               } else {
+                       wfDebug( __METHOD__ . ": parser cache hit\n" );
+                       return true;
+               }
+       }
+
+       /**
+        * @return bool
+        */
+       function fallback() {
+               $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );
+
+               if ( $this->parserOutput === false ) {
+                       wfDebugLog( 'dirty', "dirty missing\n" );
+                       wfDebug( __METHOD__ . ": no dirty cache\n" );
+                       return false;
+               } else {
+                       wfDebug( __METHOD__ . ": sending dirty output\n" );
+                       wfDebugLog( 'dirty', "dirty output {$this->cacheKey}\n" );
+                       $this->isDirty = true;
+                       return true;
+               }
+       }
+
+       /**
+        * @param $status Status
+        */
+       function error( $status ) {
+               $this->error = $status;
+               return false;
        }
 }