Additional release note for I495683

[mediawiki.git] / includes / changes / EnhancedChangesList.php

<?php
/**
 * Generates a list of changes using an Enhanced system (uses javascript).
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

class EnhancedChangesList extends ChangesList {

        /**
         * @var RCCacheEntryFactory
         */
        protected $cacheEntryFactory;

        /**
         * @var array Array of array of RCCacheEntry
         */
        protected $rc_cache;

        /**
         * @param IContextSource|Skin $obj
         * @throws MWException
         */
        public function __construct( $obj ) {
                if ( $obj instanceof Skin ) {
                        // @todo: deprecate constructing with Skin
                        $context = $obj->getContext();
                } else {
                        if ( !$obj instanceof IContextSource ) {
                                throw new MWException( 'EnhancedChangesList must be constructed with a '
                                        . 'context source or skin.' );
                        }

                        $context = $obj;
                }

                parent::__construct( $context );

                // message is set by the parent ChangesList class
                $this->cacheEntryFactory = new RCCacheEntryFactory(
                        $context,
                        $this->message
                );
        }

        /**
         * Add the JavaScript file for enhanced changeslist
         * @return string
         */
        public function beginRecentChangesList() {
                $this->rc_cache = array();
                $this->rcMoveIndex = 0;
                $this->rcCacheIndex = 0;
                $this->lastdate = '';
                $this->rclistOpen = false;
                $this->getOutput()->addModuleStyles( array(
                        'mediawiki.special.changeslist',
                        'mediawiki.special.changeslist.enhanced',
                ) );
                $this->getOutput()->addModules( array(
                        'jquery.makeCollapsible',
                        'mediawiki.icon',
                ) );

                return '<div class="mw-changeslist">';
        }

        /**
         * Format a line for enhanced recentchange (aka with javascript and block of lines).
         *
         * @param RecentChange $rc
         * @param bool $watched
         * @param int $linenumber (default null)
         *
         * @return string
         */
        public function recentChangesLine( &$rc, $watched = false, $linenumber = null ) {

                $date = $this->getLanguage()->userDate(
                        $rc->mAttribs['rc_timestamp'],
                        $this->getUser()
                );

                $ret = '';

                # If it's a new day, add the headline and flush the cache
                if ( $date != $this->lastdate ) {
                        # Process current cache
                        $ret = $this->recentChangesBlock();
                        $this->rc_cache = array();
                        $ret .= Xml::element( 'h4', null, $date ) . "\n";
                        $this->lastdate = $date;
                }

                $cacheEntry = $this->cacheEntryFactory->newFromRecentChange( $rc, $watched );
                $this->addCacheEntry( $cacheEntry );

                return $ret;
        }

        /**
         * Put accumulated information into the cache, for later display.
         * Page moves go on their own line.
         *
         * @param RCCacheEntry $cacheEntry
         */
        protected function addCacheEntry( RCCacheEntry $cacheEntry ) {
                $cacheGroupingKey = $this->makeCacheGroupingKey( $cacheEntry );

                if ( !isset( $this->rc_cache[$cacheGroupingKey] ) ) {
                        $this->rc_cache[$cacheGroupingKey] = array();
                }

                array_push( $this->rc_cache[$cacheGroupingKey], $cacheEntry );
        }

        /**
         * @todo use rc_source to group, if set; fallback to rc_type
         *
         * @param RCCacheEntry $cacheEntry
         *
         * @return string
         */
        protected function makeCacheGroupingKey( RCCacheEntry $cacheEntry ) {
                $title = $cacheEntry->getTitle();
                $cacheGroupingKey = $title->getPrefixedDBkey();

                $type = $cacheEntry->mAttribs['rc_type'];

                if ( $type == RC_LOG ) {
                        // Group by log type
                        $cacheGroupingKey = SpecialPage::getTitleFor(
                                'Log',
                                $cacheEntry->mAttribs['rc_log_type']
                        )->getPrefixedDBkey();
                }

                return $cacheGroupingKey;
        }

        /**
         * Enhanced RC group
         * @param RCCacheEntry[] $block
         * @return string
         */
        protected function recentChangesBlockGroup( $block ) {

                # Add the namespace and title of the block as part of the class
                $classes = array( 'mw-collapsible', 'mw-collapsed', 'mw-enhanced-rc' );
                if ( $block[0]->mAttribs['rc_log_type'] ) {
                        # Log entry
                        $classes[] = Sanitizer::escapeClass( 'mw-changeslist-log-'
                                . $block[0]->mAttribs['rc_log_type'] );
                } else {
                        $classes[] = Sanitizer::escapeClass( 'mw-changeslist-ns'
                                . $block[0]->mAttribs['rc_namespace'] . '-' . $block[0]->mAttribs['rc_title'] );
                }
                $classes[] = $block[0]->watched && $block[0]->mAttribs['rc_timestamp'] >= $block[0]->watched
                        ? 'mw-changeslist-line-watched' : 'mw-changeslist-line-not-watched';
                $r = Html::openElement( 'table', array( 'class' => $classes ) ) .
                        Html::openElement( 'tr' );

                # Collate list of users
                $userlinks = array();
                # Other properties
                $unpatrolled = false;
                $isnew = false;
                $allBots = true;
                $allMinors = true;
                $curId = 0;
                # Some catalyst variables...
                $namehidden = true;
                $allLogs = true;
                $RCShowChangedSize = $this->getConfig()->get( 'RCShowChangedSize' );
                foreach ( $block as $rcObj ) {
                        if ( $rcObj->mAttribs['rc_type'] == RC_NEW ) {
                                $isnew = true;
                        }
                        // If all log actions to this page were hidden, then don't
                        // give the name of the affected page for this block!
                        if ( !$this->isDeleted( $rcObj, LogPage::DELETED_ACTION ) ) {
                                $namehidden = false;
                        }
                        $u = $rcObj->userlink;
                        if ( !isset( $userlinks[$u] ) ) {
                                $userlinks[$u] = 0;
                        }
                        if ( $rcObj->unpatrolled ) {
                                $unpatrolled = true;
                        }
                        if ( $rcObj->mAttribs['rc_type'] != RC_LOG ) {
                                $allLogs = false;
                        }
                        # Get the latest entry with a page_id and oldid
                        # since logs may not have these.
                        if ( !$curId && $rcObj->mAttribs['rc_cur_id'] ) {
                                $curId = $rcObj->mAttribs['rc_cur_id'];
                        }

                        if ( !$rcObj->mAttribs['rc_bot'] ) {
                                $allBots = false;
                        }
                        if ( !$rcObj->mAttribs['rc_minor'] ) {
                                $allMinors = false;
                        }

                        $userlinks[$u]++;
                }

                # Sort the list and convert to text
                krsort( $userlinks );
                asort( $userlinks );
                $users = array();
                foreach ( $userlinks as $userlink => $count ) {
                        $text = $userlink;
                        $text .= $this->getLanguage()->getDirMark();
                        if ( $count > 1 ) {
                                // @todo FIXME: Hardcoded '×'. Should be a message.
                                $formattedCount = $this->getLanguage()->formatNum( $count ) . '×';
                                $text .= ' ' . $this->msg( 'parentheses' )->rawParams( $formattedCount )->escaped();
                        }
                        array_push( $users, $text );
                }

                $users = ' <span class="changedby">'
                        . $this->msg( 'brackets' )->rawParams(
                                implode( $this->message['semicolon-separator'], $users )
                        )->escaped() . '</span>';

                $tl = '<span class="mw-collapsible-toggle mw-collapsible-arrow ' .
                        'mw-enhancedchanges-arrow mw-enhancedchanges-arrow-space"></span>';
                $r .= "<td>$tl</td>";

                # Main line
                $r .= '<td class="mw-enhanced-rc">' . $this->recentChangesFlags( array(
                        'newpage' => $isnew, # show, when one have this flag
                        'minor' => $allMinors, # show only, when all have this flag
                        'unpatrolled' => $unpatrolled, # show, when one have this flag
                        'bot' => $allBots, # show only, when all have this flag
                ) );

                # Timestamp
                $r .= '&#160;' . $block[0]->timestamp . '&#160;</td><td>';

                # Article link
                if ( $namehidden ) {
                        $r .= ' <span class="history-deleted">' .
                                $this->msg( 'rev-deleted-event' )->escaped() . '</span>';
                } elseif ( $allLogs ) {
                        $r .= $this->maybeWatchedLink( $block[0]->link, $block[0]->watched );
                } else {
                        $this->insertArticleLink( $r, $block[0], $block[0]->unpatrolled, $block[0]->watched );
                }

                $r .= $this->getLanguage()->getDirMark();

                $queryParams['curid'] = $curId;

                # Sub-entries
                $lines = '';
                foreach ( $block as $i => $rcObj ) {
                        $line = $this->getLineData( $block, $rcObj, $queryParams );
                        $lines .= $line;
                        if ( !$line ) {
                                // completely ignore this RC entry if we don't want to render it
                                unset( $block[$i] );
                        }
                }
                // Further down are some assumptions that $block is a 0-indexed array
                // with (count-1) as last key. Let's make sure it is.
                $block = array_values( $block );
                if ( empty( $block ) ) {
                        // if we can't show anything, don't display this block altogether
                        return '';
                }

                $r .= $this->getLogText( $block, $queryParams, $allLogs, $isnew, $namehidden );

                $r .= ' <span class="mw-changeslist-separator">. .</span> ';

                # Character difference (does not apply if only log items)
                if ( $RCShowChangedSize && !$allLogs ) {
                        $last = 0;
                        $first = count( $block ) - 1;
                        # Some events (like logs) have an "empty" size, so we need to skip those...
                        while ( $last < $first && $block[$last]->mAttribs['rc_new_len'] === null ) {
                                $last++;
                        }
                        while ( $first > $last && $block[$first]->mAttribs['rc_old_len'] === null ) {
                                $first--;
                        }
                        # Get net change
                        $chardiff = $this->formatCharacterDifference( $block[$first], $block[$last] );

                        if ( $chardiff == '' ) {
                                $r .= ' ';
                        } else {
                                $r .= ' ' . $chardiff . ' <span class="mw-changeslist-separator">. .</span> ';
                        }
                }

                $r .= $users;
                $r .= $this->numberofWatchingusers( $block[0]->numberofWatchingusers );
                $r .= '</td></tr>';

                if ( !$lines ) {
                        // if there are no lines to be rendered (all aborted by hook), don't render the block
                        return '';
                }

                $r .= $lines;
                $r .= "</table>\n";

                $this->rcCacheIndex++;

                return $r;
        }

        /**
         * @param RCCacheEntry[] $block
         * @param RCCacheEntry $rcObj
         * @param array $queryParams
         * @return string
         * @throws Exception
         * @throws FatalError
         * @throws MWException
         */
        protected function getLineData( array $block, RCCacheEntry $rcObj, array $queryParams = array() ) {
                $RCShowChangedSize = $this->getConfig()->get( 'RCShowChangedSize' );

                # Classes to apply -- TODO implement
                $classes = array();
                $type = $rcObj->mAttribs['rc_type'];
                $data = array();

                $trClass = $rcObj->watched && $rcObj->mAttribs['rc_timestamp'] >= $rcObj->watched
                        ? ' class="mw-enhanced-watched"' : '';
                $separator = ' <span class="mw-changeslist-separator">. .</span> ';

                $data['recentChangesFlags'] = array(
                        'newpage' => $type == RC_NEW,
                        'minor' => $rcObj->mAttribs['rc_minor'],
                        'unpatrolled' => $rcObj->unpatrolled,
                        'bot' => $rcObj->mAttribs['rc_bot'],
                );

                $params = $queryParams;

                if ( $rcObj->mAttribs['rc_this_oldid'] != 0 ) {
                        $params['oldid'] = $rcObj->mAttribs['rc_this_oldid'];
                }

                # Log timestamp
                if ( $type == RC_LOG ) {
                        $link = $rcObj->timestamp;
                        # Revision link
                } elseif ( !ChangesList::userCan( $rcObj, Revision::DELETED_TEXT, $this->getUser() ) ) {
                        $link = '<span class="history-deleted">' . $rcObj->timestamp . '</span> ';
                } else {
                        $link = Linker::linkKnown(
                                $rcObj->getTitle(),
                                $rcObj->timestamp,
                                array(),
                                $params
                        );
                        if ( $this->isDeleted( $rcObj, Revision::DELETED_TEXT ) ) {
                                $link = '<span class="history-deleted">' . $link . '</span> ';
                        }
                }
                $data['timestampLink'] = $link;

                $currentAndLastLinks = '';
                if ( !$type == RC_LOG || $type == RC_NEW ) {
                        $currentAndLastLinks .= ' ' . $this->msg( 'parentheses' )->rawParams(
                                        $rcObj->curlink .
                                        $this->message['pipe-separator'] .
                                        $rcObj->lastlink
                                )->escaped();
                }
                $data['currentAndLastLinks'] = $currentAndLastLinks;
                $data['separatorAfterCurrentAndLastLinks'] = $separator;

                # Character diff
                if ( $RCShowChangedSize ) {
                        $cd = $this->formatCharacterDifference( $rcObj );
                        if ( $cd !== '' ) {
                                $data['characterDiff'] = $cd;
                                $data['separatorAfterCharacterDiff'] = $separator;
                        }
                }

                if ( $rcObj->mAttribs['rc_type'] == RC_LOG ) {
                        $data['logEntry'] = $this->insertLogEntry( $rcObj );
                } elseif ( $this->isCategorizationWithoutRevision( $rcObj ) ) {
                        $data['comment'] = $this->insertComment( $rcObj );
                } else {
                        # User links
                        $data['userLink'] = $rcObj->userlink;
                        $data['userTalkLink'] = $rcObj->usertalklink;
                        $data['comment'] = $this->insertComment( $rcObj );
                }

                # Rollback
                $data['rollback'] = $this->getRollback( $rcObj );

                # Tags
                $data['tags'] = $this->getTags( $rcObj, $classes );

                // give the hook a chance to modify the data
                $success = Hooks::run( 'EnhancedChangesListModifyLineData',
                        array( $this, &$data, $block, $rcObj ) );
                if ( !$success ) {
                        // skip entry if hook aborted it
                        return '';
                }

                $line = '<tr' . $trClass . '><td></td><td class="mw-enhanced-rc">';
                if ( isset( $data['recentChangesFlags'] ) ) {
                        $line .= $this->recentChangesFlags( $data['recentChangesFlags'] );
                        unset( $data['recentChangesFlags'] );
                }
                $line .= '&#160;</td><td class="mw-enhanced-rc-nested">';

                if ( isset( $data['timestampLink'] ) ) {
                        $line .= '<span class="mw-enhanced-rc-time">' . $data['timestampLink'] . '</span>';
                        unset( $data['timestampLink'] );
                }

                // everything else: makes it easier for extensions to add or remove data
                $line .= implode( '', $data );

                $line .= "</td></tr>\n";

                return $line;
        }

        /**
         * Generates amount of changes (linking to diff ) & link to history.
         *
         * @param array $block
         * @param array $queryParams
         * @param bool $allLogs
         * @param bool $isnew
         * @param bool $namehidden
         * @return string
         */
        protected function getLogText( $block, $queryParams, $allLogs, $isnew, $namehidden ) {
                if ( empty( $block ) ) {
                        return '';
                }

                # Changes message
                static $nchanges = array();
                static $sinceLastVisitMsg = array();

                $n = count( $block );
                if ( !isset( $nchanges[$n] ) ) {
                        $nchanges[$n] = $this->msg( 'nchanges' )->numParams( $n )->escaped();
                }

                $sinceLast = 0;
                $unvisitedOldid = null;
                /** @var $rcObj RCCacheEntry */
                foreach ( $block as $rcObj ) {
                        // Same logic as below inside main foreach
                        if ( $rcObj->watched && $rcObj->mAttribs['rc_timestamp'] >= $rcObj->watched ) {
                                $sinceLast++;
                                $unvisitedOldid = $rcObj->mAttribs['rc_last_oldid'];
                        }
                }
                if ( !isset( $sinceLastVisitMsg[$sinceLast] ) ) {
                        $sinceLastVisitMsg[$sinceLast] =
                                $this->msg( 'enhancedrc-since-last-visit' )->numParams( $sinceLast )->escaped();
                }

                $currentRevision = 0;
                foreach ( $block as $rcObj ) {
                        if ( !$currentRevision ) {
                                $currentRevision = $rcObj->mAttribs['rc_this_oldid'];
                        }
                }

                # Total change link
                $links = array();
                /** @var $block0 RecentChange */
                $block0 = $block[0];
                $last = $block[count( $block ) - 1];
                if ( !$allLogs && $rcObj->mAttribs['rc_type'] != RC_CATEGORIZE ) {
                        if ( !ChangesList::userCan( $rcObj, Revision::DELETED_TEXT, $this->getUser() ) ) {
                                $links['total-changes'] = $nchanges[$n];
                        } elseif ( $isnew ) {
                                $links['total-changes'] = $nchanges[$n];
                        } else {
                                $links['total-changes'] = Linker::link(
                                        $block0->getTitle(),
                                        $nchanges[$n],
                                        array(),
                                        $queryParams + array(
                                                'diff' => $currentRevision,
                                                'oldid' => $last->mAttribs['rc_last_oldid'],
                                        ),
                                        array( 'known', 'noclasses' )
                                );
                                if ( $sinceLast > 0 && $sinceLast < $n ) {
                                        $links['total-changes-since-last'] = Linker::link(
                                                        $block0->getTitle(),
                                                        $sinceLastVisitMsg[$sinceLast],
                                                        array(),
                                                        $queryParams + array(
                                                                'diff' => $currentRevision,
                                                                'oldid' => $unvisitedOldid,
                                                        ),
                                                        array( 'known', 'noclasses' )
                                                );
                                }
                        }
                }

                # History
                if ( $allLogs || $rcObj->mAttribs['rc_type'] == RC_CATEGORIZE ) {
                        // don't show history link for logs
                } elseif ( $namehidden || !$block0->getTitle()->exists() ) {
                        $links['history'] = $this->message['enhancedrc-history'];
                } else {
                        $params = $queryParams;
                        $params['action'] = 'history';

                        $links['history'] = Linker::linkKnown(
                                        $block0->getTitle(),
                                        $this->message['enhancedrc-history'],
                                        array(),
                                        $params
                                );
                }

                # Allow others to alter, remove or add to these links
                Hooks::run( 'EnhancedChangesList::getLogText',
                        array( $this, &$links, $block ) );

                if ( !$links ) {
                        return '';
                }

                $logtext = implode( $this->message['pipe-separator'], $links );
                $logtext = $this->msg( 'parentheses' )->rawParams( $logtext )->escaped();
                return ' ' . $logtext;
        }

        /**
         * Enhanced RC ungrouped line.
         *
         * @param RecentChange|RCCacheEntry $rcObj
         * @return string A HTML formatted line (generated using $r)
         */
        protected function recentChangesBlockLine( $rcObj ) {
                $data = array();

                $query['curid'] = $rcObj->mAttribs['rc_cur_id'];

                $type = $rcObj->mAttribs['rc_type'];
                $logType = $rcObj->mAttribs['rc_log_type'];
                $classes = array( 'mw-enhanced-rc' );
                if ( $logType ) {
                        # Log entry
                        $classes[] = Sanitizer::escapeClass( 'mw-changeslist-log-' . $logType );
                } else {
                        $classes[] = Sanitizer::escapeClass( 'mw-changeslist-ns' .
                                $rcObj->mAttribs['rc_namespace'] . '-' . $rcObj->mAttribs['rc_title'] );
                }
                $classes[] = $rcObj->watched && $rcObj->mAttribs['rc_timestamp'] >= $rcObj->watched
                        ? 'mw-changeslist-line-watched' : 'mw-changeslist-line-not-watched';

                # Flag and Timestamp
                $data['recentChangesFlags'] = array(
                        'newpage' => $type == RC_NEW,
                        'minor' => $rcObj->mAttribs['rc_minor'],
                        'unpatrolled' => $rcObj->unpatrolled,
                        'bot' => $rcObj->mAttribs['rc_bot'],
                );
                // timestamp is not really a link here, but is called timestampLink
                // for consistency with EnhancedChangesListModifyLineData
                $data['timestampLink'] = $rcObj->timestamp;

                # Article or log link
                if ( $logType ) {
                        $logPage = new LogPage( $logType );
                        $logTitle = SpecialPage::getTitleFor( 'Log', $logType );
                        $logName = $logPage->getName()->escaped();
                        $data['logLink'] = $this->msg( 'parentheses' )
                                ->rawParams( Linker::linkKnown( $logTitle, $logName ) )->escaped();
                } else {
                        $data['articleLink'] = $this->getArticleLink( $rcObj, $rcObj->unpatrolled, $rcObj->watched );
                }

                # Diff and hist links
                if ( $type != RC_LOG && $type != RC_CATEGORIZE ) {
                        $query['action'] = 'history';
                        $data['historyLink'] = $this->getDiffHistLinks( $rcObj, $query );
                }
                $data['separatorAfterLinks'] = ' <span class="mw-changeslist-separator">. .</span> ';

                # Character diff
                if ( $this->getConfig()->get( 'RCShowChangedSize' ) ) {
                        $cd = $this->formatCharacterDifference( $rcObj );
                        if ( $cd !== '' ) {
                                $data['characterDiff'] = $cd;
                                $data['separatorAftercharacterDiff'] = ' <span class="mw-changeslist-separator">. .</span> ';
                        }
                }

                if ( $type == RC_LOG ) {
                        $data['logEntry'] = $this->insertLogEntry( $rcObj );
                } elseif ( $this->isCategorizationWithoutRevision( $rcObj ) ) {
                        $data['comment'] = $this->insertComment( $rcObj );
                } else {
                        $data['userLink'] = $rcObj->userlink;
                        $data['userTalkLink'] = $rcObj->usertalklink;
                        $data['comment'] = $this->insertComment( $rcObj );
                        if ( $type == RC_CATEGORIZE ) {
                                $data['historyLink'] = $this->getDiffHistLinks( $rcObj, $query );
                        }
                        $data['rollback'] = $this->getRollback( $rcObj );
                }

                # Tags
                $data['tags'] = $this->getTags( $rcObj, $classes );

                # Show how many people are watching this if enabled
                $data['watchingUsers'] = $this->numberofWatchingusers( $rcObj->numberofWatchingusers );

                // give the hook a chance to modify the data
                $success = Hooks::run( 'EnhancedChangesListModifyBlockLineData',
                        array( $this, &$data, $rcObj ) );
                if ( !$success ) {
                        // skip entry if hook aborted it
                        return '';
                }

                $line = Html::openElement( 'table', array( 'class' => $classes ) ) .
                        Html::openElement( 'tr' );
                $line .= '<td class="mw-enhanced-rc"><span class="mw-enhancedchanges-arrow-space"></span>';

                if ( isset( $data['recentChangesFlags'] ) ) {
                        $line .= $this->recentChangesFlags( $data['recentChangesFlags'] );
                        unset( $data['recentChangesFlags'] );
                }

                if ( isset( $data['timestampLink'] ) ) {
                        $line .= '&#160;' . $data['timestampLink'];
                        unset( $data['timestampLink'] );
                }
                $line .= '&#160;</td><td>';

                // everything else: makes it easier for extensions to add or remove data
                $line .= implode( '', $data );

                $line .= "</td></tr></table>\n";

                return $line;
        }

        /**
         * Returns value to be used in 'historyLink' element of $data param in
         * EnhancedChangesListModifyBlockLineData hook.
         *
         * @since 1.27
         *
         * @param RCCacheEntry $rc
         * @param array $query array of key/value pairs to append as a query string
         * @return string HTML
         */
        public function getDiffHistLinks( RCCacheEntry $rc, array $query ) {
                $pageTitle = $rc->getTitle();
                if ( $rc->getAttribute( 'rc_type' ) == RC_CATEGORIZE ) {
                        // For categorizations we must swap the category title with the page title!
                        $pageTitle = Title::newFromID( $rc->getAttribute( 'rc_cur_id' ) );
                }

                $retVal = ' ' . $this->msg( 'parentheses' )
                                ->rawParams( $rc->difflink . $this->message['pipe-separator'] . Linker::linkKnown(
                                                $pageTitle,
                                                $this->message['hist'],
                                                array(),
                                                $query
                                        ) )->escaped();
                return $retVal;
        }

        /**
         * If enhanced RC is in use, this function takes the previously cached
         * RC lines, arranges them, and outputs the HTML
         *
         * @return string
         */
        protected function recentChangesBlock() {
                if ( count( $this->rc_cache ) == 0 ) {
                        return '';
                }

                $blockOut = '';
                foreach ( $this->rc_cache as $block ) {
                        if ( count( $block ) < 2 ) {
                                $blockOut .= $this->recentChangesBlockLine( array_shift( $block ) );
                        } else {
                                $blockOut .= $this->recentChangesBlockGroup( $block );
                        }
                }

                return '<div>' . $blockOut . '</div>';
        }

        /**
         * Returns text for the end of RC
         * If enhanced RC is in use, returns pretty much all the text
         * @return string
         */
        public function endRecentChangesList() {
                return $this->recentChangesBlock() . '</div>';
        }
}