]> scripts.mit.edu Git - autoinstallsdev/mediawiki.git/blobdiff - includes/HistoryPage.php
MediaWiki 1.30.2
[autoinstallsdev/mediawiki.git] / includes / HistoryPage.php
diff --git a/includes/HistoryPage.php b/includes/HistoryPage.php
deleted file mode 100644 (file)
index b2cf044..0000000
+++ /dev/null
@@ -1,765 +0,0 @@
-<?php
-/**
- * Page history
- *
- * Split off from Article.php and Skin.php, 2003-12-22
- * @file
- */
-
-/**
- * This class handles printing the history page for an article.  In order to
- * be efficient, it uses timestamps rather than offsets for paging, to avoid
- * costly LIMIT,offset queries.
- *
- * Construct it by passing in an Article, and call $h->history() to print the
- * history.
- *
- */
-class HistoryPage {
-       const DIR_PREV = 0;
-       const DIR_NEXT = 1;
-
-       /** Contains the Article object. Passed on construction. */
-       private $article;
-       /** The $article title object. Found on construction. */
-       private $title;
-       /** Shortcut to the user Skin object. */
-       private $skin;
-
-       /**
-        * Construct a new HistoryPage.
-        *
-        * @param $article Article
-        */
-       function __construct( $article ) {
-               global $wgUser;
-               $this->article = $article;
-               $this->title = $article->getTitle();
-               $this->skin = $wgUser->getSkin();
-               $this->preCacheMessages();
-       }
-
-       /** Get the Article object we are working on. */
-       public function getArticle() {
-               return $this->article;
-       }
-
-       /** Get the Title object. */
-       public function getTitle() {
-               return $this->title;
-       }
-
-       /**
-        * As we use the same small set of messages in various methods and that
-        * they are called often, we call them once and save them in $this->message
-        */
-       private function preCacheMessages() {
-               // Precache various messages
-               if ( !isset( $this->message ) ) {
-                       $msgs = array( 'cur', 'last', 'pipe-separator' );
-                       foreach ( $msgs as $msg ) {
-                               $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
-                       }
-               }
-       }
-
-       /**
-        * Print the history page for an article.
-        * @return nothing
-        */
-       function history() {
-               global $wgOut, $wgRequest, $wgScript;
-
-               /**
-                * Allow client caching.
-                */
-               if ( $wgOut->checkLastModified( $this->article->getTouched() ) )
-                       return; // Client cache fresh and headers sent, nothing more to do.
-
-               wfProfileIn( __METHOD__ );
-
-               // Setup page variables.
-               $wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
-               $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
-               $wgOut->setArticleFlag( false );
-               $wgOut->setArticleRelated( true );
-               $wgOut->setRobotPolicy( 'noindex,nofollow' );
-               $wgOut->setSyndicated( true );
-               $wgOut->setFeedAppendQuery( 'action=history' );
-               $wgOut->addModules( array( 'mediawiki.legacy.history', 'mediawiki.action.history' ) );
-
-               // Creation of a subtitle link pointing to [[Special:Log]]
-               $logPage = SpecialPage::getTitleFor( 'Log' );
-               $logLink = $this->skin->link(
-                       $logPage,
-                       wfMsgHtml( 'viewpagelogs' ),
-                       array(),
-                       array( 'page' => $this->title->getPrefixedText() ),
-                       array( 'known', 'noclasses' )
-               );
-               $wgOut->setSubtitle( $logLink );
-
-               // Handle atom/RSS feeds.
-               $feedType = $wgRequest->getVal( 'feed' );
-               if ( $feedType ) {
-                       wfProfileOut( __METHOD__ );
-                       return $this->feed( $feedType );
-               }
-
-               // Fail nicely if article doesn't exist.
-               if ( !$this->title->exists() ) {
-                       $wgOut->addWikiMsg( 'nohistory' );
-                       # show deletion/move log if there is an entry
-                       LogEventsList::showLogExtract(
-                               $wgOut,
-                               array( 'delete', 'move' ),
-                               $this->title->getPrefixedText(),
-                               '',
-                               array(  'lim' => 10,
-                                       'conds' => array( "log_action != 'revision'" ),
-                                       'showIfEmpty' => false,
-                                       'msgKey' => array( 'moveddeleted-notice' )
-                               )
-                       );
-                       wfProfileOut( __METHOD__ );
-                       return;
-               }
-
-               /**
-                * Add date selector to quickly get to a certain time
-                */
-               $year        = $wgRequest->getInt( 'year' );
-               $month       = $wgRequest->getInt( 'month' );
-               $tagFilter   = $wgRequest->getVal( 'tagfilter' );
-               $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
-
-               /**
-                * Option to show only revisions that have been (partially) hidden via RevisionDelete
-                */
-               if ( $wgRequest->getBool( 'deleted' ) ) {
-                       $conds = array( "rev_deleted != '0'" );
-               } else {
-                       $conds = array();
-               }
-               $checkDeleted = Xml::checkLabel( wfMsg( 'history-show-deleted' ),
-                       'deleted', 'mw-show-deleted-only', $wgRequest->getBool( 'deleted' ) ) . "\n";
-
-               // Add the general form
-               $action = htmlspecialchars( $wgScript );
-               $wgOut->addHTML(
-                       "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
-                       Xml::fieldset(
-                               wfMsg( 'history-fieldset-title' ),
-                               false,
-                               array( 'id' => 'mw-history-search' )
-                       ) .
-                       Html::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
-                       Html::hidden( 'action', 'history' ) . "\n" .
-                       Xml::dateMenu( $year, $month ) . '&#160;' .
-                       ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
-                       $checkDeleted .
-                       Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
-                       '</fieldset></form>'
-               );
-
-               wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
-
-               // Create and output the list.
-               $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
-               $wgOut->addHTML(
-                       $pager->getNavigationBar() .
-                       $pager->getBody() .
-                       $pager->getNavigationBar()
-               );
-               $wgOut->preventClickjacking( $pager->getPreventClickjacking() );
-
-               wfProfileOut( __METHOD__ );
-       }
-
-       /**
-        * Fetch an array of revisions, specified by a given limit, offset and
-        * direction. This is now only used by the feeds. It was previously
-        * used by the main UI but that's now handled by the pager.
-        *
-        * @param $limit Integer: the limit number of revisions to get
-        * @param $offset Integer
-        * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
-        * @return ResultWrapper
-        */
-       function fetchRevisions( $limit, $offset, $direction ) {
-               $dbr = wfGetDB( DB_SLAVE );
-
-               if ( $direction == HistoryPage::DIR_PREV ) {
-                       list( $dirs, $oper ) = array( "ASC", ">=" );
-               } else { /* $direction == HistoryPage::DIR_NEXT */
-                       list( $dirs, $oper ) = array( "DESC", "<=" );
-               }
-
-               if ( $offset ) {
-                       $offsets = array( "rev_timestamp $oper '$offset'" );
-               } else {
-                       $offsets = array();
-               }
-
-               $page_id = $this->title->getArticleID();
-
-               return $dbr->select( 'revision',
-                       Revision::selectFields(),
-                       array_merge( array( "rev_page=$page_id" ), $offsets ),
-                       __METHOD__,
-                       array( 'ORDER BY' => "rev_timestamp $dirs",
-                               'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
-               );
-       }
-
-       /**
-        * Output a subscription feed listing recent edits to this page.
-        *
-        * @param $type String: feed type
-        */
-       function feed( $type ) {
-               global $wgFeedClasses, $wgRequest, $wgFeedLimit;
-               if ( !FeedUtils::checkFeedOutput( $type ) ) {
-                       return;
-               }
-
-               $feed = new $wgFeedClasses[$type](
-                       $this->title->getPrefixedText() . ' - ' .
-                       wfMsgForContent( 'history-feed-title' ),
-                       wfMsgForContent( 'history-feed-description' ),
-                       $this->title->getFullUrl( 'action=history' )
-               );
-
-               // Get a limit on number of feed entries. Provide a sane default
-               // of 10 if none is defined (but limit to $wgFeedLimit max)
-               $limit = $wgRequest->getInt( 'limit', 10 );
-               if ( $limit > $wgFeedLimit || $limit < 1 ) {
-                       $limit = 10;
-               }
-               $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
-
-               // Generate feed elements enclosed between header and footer.
-               $feed->outHeader();
-               if ( $items ) {
-                       foreach ( $items as $row ) {
-                               $feed->outItem( $this->feedItem( $row ) );
-                       }
-               } else {
-                       $feed->outItem( $this->feedEmpty() );
-               }
-               $feed->outFooter();
-       }
-
-       function feedEmpty() {
-               global $wgOut;
-               return new FeedItem(
-                       wfMsgForContent( 'nohistory' ),
-                       $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
-                       $this->title->getFullUrl(),
-                       wfTimestamp( TS_MW ),
-                       '',
-                       $this->title->getTalkPage()->getFullUrl()
-               );
-       }
-
-       /**
-        * Generate a FeedItem object from a given revision table row
-        * Borrows Recent Changes' feed generation functions for formatting;
-        * includes a diff to the previous revision (if any).
-        *
-        * @param $row Object: database row
-        * @return FeedItem
-        */
-       function feedItem( $row ) {
-               $rev = new Revision( $row );
-               $rev->setTitle( $this->title );
-               $text = FeedUtils::formatDiffRow(
-                       $this->title,
-                       $this->title->getPreviousRevisionID( $rev->getId() ),
-                       $rev->getId(),
-                       $rev->getTimestamp(),
-                       $rev->getComment()
-               );
-               if ( $rev->getComment() == '' ) {
-                       global $wgContLang;
-                       $title = wfMsgForContent( 'history-feed-item-nocomment',
-                               $rev->getUserText(),
-                               $wgContLang->timeanddate( $rev->getTimestamp() ),
-                               $wgContLang->date( $rev->getTimestamp() ),
-                               $wgContLang->time( $rev->getTimestamp() )
-                       );
-               } else {
-                       $title = $rev->getUserText() .
-                       wfMsgForContent( 'colon-separator' ) .
-                       FeedItem::stripComment( $rev->getComment() );
-               }
-               return new FeedItem(
-                       $title,
-                       $text,
-                       $this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
-                       $rev->getTimestamp(),
-                       $rev->getUserText(),
-                       $this->title->getTalkPage()->getFullUrl()
-               );
-       }
-}
-
-/**
- * @ingroup Pager
- */
-class HistoryPager extends ReverseChronologicalPager {
-       public $lastRow = false, $counter, $historyPage, $title, $buttons, $conds;
-       protected $oldIdChecked;
-       protected $preventClickjacking = false;
-
-       function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
-               parent::__construct();
-               $this->historyPage = $historyPage;
-               $this->title = $this->historyPage->getTitle();
-               $this->tagFilter = $tagFilter;
-               $this->getDateCond( $year, $month );
-               $this->conds = $conds;
-       }
-
-       // For hook compatibility...
-       function getArticle() {
-               return $this->historyPage->getArticle();
-       }
-
-       function getSqlComment() {
-               if ( $this->conds ) {
-                       return 'history page filtered'; // potentially slow, see CR r58153
-               } else {
-                       return 'history page unfiltered';
-               }
-       }
-
-       function getQueryInfo() {
-               $queryInfo = array(
-                       'tables'  => array( 'revision' ),
-                       'fields'  => Revision::selectFields(),
-                       'conds'   => array_merge(
-                               array( 'rev_page' => $this->historyPage->getTitle()->getArticleID() ),
-                               $this->conds ),
-                       'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
-                       'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
-               );
-               ChangeTags::modifyDisplayQuery(
-                       $queryInfo['tables'],
-                       $queryInfo['fields'],
-                       $queryInfo['conds'],
-                       $queryInfo['join_conds'],
-                       $queryInfo['options'],
-                       $this->tagFilter
-               );
-               wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
-               return $queryInfo;
-       }
-
-       function getIndexField() {
-               return 'rev_timestamp';
-       }
-
-       function formatRow( $row ) {
-               if ( $this->lastRow ) {
-                       $latest = ( $this->counter == 1 && $this->mIsFirst );
-                       $firstInList = $this->counter == 1;
-                       $this->counter++;
-                       $s = $this->historyLine( $this->lastRow, $row,
-                               $this->title->getNotificationTimestamp(), $latest, $firstInList );
-               } else {
-                       $s = '';
-               }
-               $this->lastRow = $row;
-               return $s;
-       }
-
-       /**
-        * Creates begin of history list with a submit button
-        *
-        * @return string HTML output
-        */
-       function getStartBody() {
-               global $wgScript, $wgUser, $wgOut, $wgContLang;
-               $this->lastRow = false;
-               $this->counter = 1;
-               $this->oldIdChecked = 0;
-
-               $wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
-               $s = Html::openElement( 'form', array( 'action' => $wgScript,
-                       'id' => 'mw-history-compare' ) ) . "\n";
-               $s .= Html::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
-               $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
-
-               $s .= '<div>' . $this->submitButton( wfMsg( 'compareselectedversions' ),
-                       array( 'class' => 'historysubmit' ) ) . "\n";
-
-               $this->buttons = '<div>';
-               $this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions' ),
-                       array( 'class' => 'historysubmit' )
-                               + $wgUser->getSkin()->tooltipAndAccessKeyAttribs( 'compareselectedversions' )
-               ) . "\n";
-
-               if ( $wgUser->isAllowed( 'deleterevision' ) ) {
-                       $this->preventClickjacking();
-                       $float = $wgContLang->alignEnd();
-                       # Note bug #20966, <button> is non-standard in IE<8
-                       $element = Html::element( 'button',
-                               array(
-                                       'type' => 'submit',
-                                       'name' => 'revisiondelete',
-                                       'value' => '1',
-                                       'style' => "float: $float;",
-                                       'class' => 'mw-history-revisiondelete-button',
-                               ),
-                               wfMsg( 'showhideselectedversions' )
-                       ) . "\n";
-                       $s .= $element;
-                       $this->buttons .= $element;
-               }
-               $this->buttons .= '</div>';
-               $s .= '</div><ul id="pagehistory">' . "\n";
-               return $s;
-       }
-
-       function getEndBody() {
-               if ( $this->lastRow ) {
-                       $latest = $this->counter == 1 && $this->mIsFirst;
-                       $firstInList = $this->counter == 1;
-                       if ( $this->mIsBackwards ) {
-                               # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
-                               if ( $this->mOffset == '' ) {
-                                       $next = null;
-                               } else {
-                                       $next = 'unknown';
-                               }
-                       } else {
-                               # The next row is the past-the-end row
-                               $next = $this->mPastTheEndRow;
-                       }
-                       $this->counter++;
-                       $s = $this->historyLine( $this->lastRow, $next,
-                               $this->title->getNotificationTimestamp(), $latest, $firstInList );
-               } else {
-                       $s = '';
-               }
-               $s .= "</ul>\n";
-               # Add second buttons only if there is more than one rev
-               if ( $this->getNumRows() > 2 ) {
-                       $s .= $this->buttons;
-               }
-               $s .= '</form>';
-               return $s;
-       }
-
-       /**
-        * Creates a submit button
-        *
-        * @param $message String: text of the submit button, will be escaped
-        * @param $attributes Array: attributes
-        * @return String: HTML output for the submit button
-        */
-       function submitButton( $message, $attributes = array() ) {
-               # Disable submit button if history has 1 revision only
-               if ( $this->getNumRows() > 1 ) {
-                       return Xml::submitButton( $message , $attributes );
-               } else {
-                       return '';
-               }
-       }
-
-       /**
-        * Returns a row from the history printout.
-        *
-        * @todo document some more, and maybe clean up the code (some params redundant?)
-        *
-        * @param $row Object: the database row corresponding to the previous line.
-        * @param $next Mixed: the database row corresponding to the next line.
-        * @param $notificationtimestamp
-        * @param $latest Boolean: whether this row corresponds to the page's latest revision.
-        * @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
-        * @return String: HTML output for the row
-        */
-       function historyLine( $row, $next, $notificationtimestamp = false,
-               $latest = false, $firstInList = false )
-       {
-               global $wgUser, $wgLang;
-               $rev = new Revision( $row );
-               $rev->setTitle( $this->title );
-
-               $curlink = $this->curLink( $rev, $latest );
-               $lastlink = $this->lastLink( $rev, $next );
-               $diffButtons = $this->diffButtons( $rev, $firstInList );
-               $histLinks = Html::rawElement(
-                               'span',
-                               array( 'class' => 'mw-history-histlinks' ),
-                               '(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
-               );
-               $s = $histLinks . $diffButtons;
-
-               $link = $this->revLink( $rev );
-               $classes = array();
-
-               $del = '';
-               // Show checkboxes for each revision
-               if ( $wgUser->isAllowed( 'deleterevision' ) ) {
-                       $this->preventClickjacking();
-                       // If revision was hidden from sysops, disable the checkbox
-                       if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
-                               $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
-                       // Otherwise, enable the checkbox...
-                       } else {
-                               $del = Xml::check( 'showhiderevisions', false,
-                                       array( 'name' => 'ids[' . $rev->getId() . ']' ) );
-                       }
-               // User can only view deleted revisions...
-               } else if ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) {
-                       // If revision was hidden from sysops, disable the link
-                       if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
-                               $cdel = $this->getSkin()->revDeleteLinkDisabled( false );
-                       // Otherwise, show the link...
-                       } else {
-                               $query = array( 'type' => 'revision',
-                                       'target' => $this->title->getPrefixedDbkey(), 'ids' => $rev->getId() );
-                               $del .= $this->getSkin()->revDeleteLink( $query,
-                                       $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
-                       }
-               }
-               if ( $del ) {
-                       $s .= " $del ";
-               }
-
-               $s .= " $link";
-               $s .= " <span class='history-user'>" .
-                       $this->getSkin()->revUserTools( $rev, true ) . "</span>";
-
-               if ( $rev->isMinor() ) {
-                       $s .= ' ' . ChangesList::flag( 'minor' );
-               }
-
-               if ( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
-                       $s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
-               }
-
-               $s .= $this->getSkin()->revComment( $rev, false, true );
-
-               if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
-                       $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
-               }
-
-               $tools = array();
-
-               # Rollback and undo links
-               if ( !is_null( $next ) && is_object( $next ) ) {
-                       if ( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
-                               $this->preventClickjacking();
-                               $tools[] = '<span class="mw-rollback-link">' .
-                                       $this->getSkin()->buildRollbackLink( $rev ) . '</span>';
-                       }
-
-                       if ( $this->title->quickUserCan( 'edit' )
-                               && !$rev->isDeleted( Revision::DELETED_TEXT )
-                               && !$next->rev_deleted & Revision::DELETED_TEXT )
-                       {
-                               # Create undo tooltip for the first (=latest) line only
-                               $undoTooltip = $latest
-                                       ? array( 'title' => wfMsg( 'tooltip-undo' ) )
-                                       : array();
-                               $undolink = $this->getSkin()->link(
-                                       $this->title,
-                                       wfMsgHtml( 'editundo' ),
-                                       $undoTooltip,
-                                       array(
-                                               'action' => 'edit',
-                                               'undoafter' => $next->rev_id,
-                                               'undo' => $rev->getId()
-                                       ),
-                                       array( 'known', 'noclasses' )
-                               );
-                               $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
-                       }
-               }
-
-               if ( $tools ) {
-                       $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
-               }
-
-               # Tags
-               list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
-               $classes = array_merge( $classes, $newClasses );
-               $s .= " $tagSummary";
-
-               wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
-
-               $attribs = array();
-               if ( $classes ) {
-                       $attribs['class'] = implode( ' ', $classes );
-               }
-
-               return Xml::tags( 'li', $attribs, $s ) . "\n";
-       }
-
-       /**
-        * Create a link to view this revision of the page
-        *
-        * @param $rev Revision
-        * @return String
-        */
-       function revLink( $rev ) {
-               global $wgLang;
-               $date = $wgLang->timeanddate( wfTimestamp( TS_MW, $rev->getTimestamp() ), true );
-               $date = htmlspecialchars( $date );
-               if ( $rev->userCan( Revision::DELETED_TEXT ) ) {
-                       $link = $this->getSkin()->link(
-                               $this->title,
-                               $date,
-                               array(),
-                               array( 'oldid' => $rev->getId() ),
-                               array( 'known', 'noclasses' )
-                       );
-               } else {
-                       $link = $date;
-               }
-               if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
-                       $link = "<span class=\"history-deleted\">$link</span>";
-               }
-               return $link;
-       }
-
-       /**
-        * Create a diff-to-current link for this revision for this page
-        *
-        * @param $rev Revision
-        * @param $latest Boolean: this is the latest revision of the page?
-        * @return String
-        */
-       function curLink( $rev, $latest ) {
-               $cur = $this->historyPage->message['cur'];
-               if ( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
-                       return $cur;
-               } else {
-                       return $this->getSkin()->link(
-                               $this->title,
-                               $cur,
-                               array(),
-                               array(
-                                       'diff' => $this->title->getLatestRevID(),
-                                       'oldid' => $rev->getId()
-                               ),
-                               array( 'known', 'noclasses' )
-                       );
-               }
-       }
-
-       /**
-        * Create a diff-to-previous link for this revision for this page.
-        *
-        * @param $prevRev Revision: the previous revision
-        * @param $next Mixed: the newer revision
-        * @return String
-        */
-       function lastLink( $prevRev, $next ) {
-               $last = $this->historyPage->message['last'];
-               # $next may either be a Row, null, or "unkown"
-               $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
-               if ( is_null( $next ) ) {
-                       # Probably no next row
-                       return $last;
-               } elseif ( $next === 'unknown' ) {
-                       # Next row probably exists but is unknown, use an oldid=prev link
-                       return $this->getSkin()->link(
-                               $this->title,
-                               $last,
-                               array(),
-                               array(
-                                       'diff' => $prevRev->getId(),
-                                       'oldid' => 'prev'
-                               ),
-                               array( 'known', 'noclasses' )
-                       );
-               } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT )
-                       || !$nextRev->userCan( Revision::DELETED_TEXT ) )
-               {
-                       return $last;
-               } else {
-                       return $this->getSkin()->link(
-                               $this->title,
-                               $last,
-                               array(),
-                               array(
-                                       'diff' => $prevRev->getId(),
-                                       'oldid' => $next->rev_id
-                               ),
-                               array( 'known', 'noclasses' )
-                       );
-               }
-       }
-
-       /**
-        * Create radio buttons for page history
-        *
-        * @param $rev Revision object
-        * @param $firstInList Boolean: is this version the first one?
-        *
-        * @return String: HTML output for the radio buttons
-        */
-       function diffButtons( $rev, $firstInList ) {
-               if ( $this->getNumRows() > 1 ) {
-                       $id = $rev->getId();
-                       $radio = array( 'type'  => 'radio', 'value' => $id );
-                       /** @todo: move title texts to javascript */
-                       if ( $firstInList ) {
-                               $first = Xml::element( 'input',
-                                       array_merge( $radio, array(
-                                               'style' => 'visibility:hidden',
-                                               'name'  => 'oldid',
-                                               'id' => 'mw-oldid-null' ) )
-                               );
-                               $checkmark = array( 'checked' => 'checked' );
-                       } else {
-                               # Check visibility of old revisions
-                               if ( !$rev->userCan( Revision::DELETED_TEXT ) ) {
-                                       $radio['disabled'] = 'disabled';
-                                       $checkmark = array(); // We will check the next possible one
-                               } else if ( !$this->oldIdChecked ) {
-                                       $checkmark = array( 'checked' => 'checked' );
-                                       $this->oldIdChecked = $id;
-                               } else {
-                                       $checkmark = array();
-                               }
-                               $first = Xml::element( 'input',
-                                       array_merge( $radio, $checkmark, array(
-                                               'name'  => 'oldid',
-                                               'id' => "mw-oldid-$id" ) ) );
-                               $checkmark = array();
-                       }
-                       $second = Xml::element( 'input',
-                               array_merge( $radio, $checkmark, array(
-                                       'name'  => 'diff',
-                                       'id' => "mw-diff-$id" ) ) );
-                       return $first . $second;
-               } else {
-                       return '';
-               }
-       }
-
-       /**
-        * This is called if a write operation is possible from the generated HTML
-        */
-       function preventClickjacking( $enable = true ) {
-               $this->preventClickjacking = $enable;
-       }
-
-       /**
-        * Get the "prevent clickjacking" flag
-        */
-       function getPreventClickjacking() {
-               return $this->preventClickjacking;
-       }
-}
-
-/**
- * Backwards-compatibility aliases
- */
-class PageHistory extends HistoryPage {}
-class PageHistoryPager extends HistoryPager {}