EnhancedChangesList.php
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EnhancedChangesList.php
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	<?php
	/**
	* 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
	*/

	use MediaWiki\Context\IContextSource;
	use MediaWiki\Html\Html;
	use MediaWiki\Html\TemplateParser;
	use MediaWiki\MainConfigNames;
	use MediaWiki\Parser\Sanitizer;
	use MediaWiki\Revision\RevisionRecord;
	use MediaWiki\SpecialPage\SpecialPage;
	use MediaWiki\Title\Title;

	/**
	* Generate a list of changes using an Enhanced system (uses javascript).
	*
	* @ingroup RecentChanges
	*/
	class EnhancedChangesList extends ChangesList {

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

	/**
	* @var RCCacheEntry[][]
	*/
	protected $rc_cache;

	/**
	* @var TemplateParser
	*/
	protected $templateParser;

	/**
	* @param IContextSource $context
	* @param ChangesListFilterGroup[] $filterGroups Array of ChangesListFilterGroup objects (currently optional)
	*/
	public function __construct( $context, array $filterGroups = [] ) {
	parent::__construct( $context, $filterGroups );

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

	/**
	* Add the JavaScript file for enhanced changeslist
	* @return string
	*/
	public function beginRecentChangesList() {
	$this->getOutput()->addModuleStyles( [
	'mediawiki.special.changeslist.enhanced',
	] );

	parent::beginRecentChangesList();
	return '<div class="mw-changeslist" aria-live="polite">';
	}

	/**
	* Format a line for enhanced recentchange (aka with javascript and block of lines).
	*
	* @param RecentChange &$rc
	* @param bool $watched
	* @param int\|null $linenumber (default null)
	*
	* @return string
	*/
	public function recentChangesLine( &$rc, $watched = false, $linenumber = null ) {
	$date = $this->getLanguage()->userDate(
	$rc->mAttribs['rc_timestamp'],
	$this->getUser()
	);
	if ( $this->lastdate === '' ) {
	$this->lastdate = $date;
	}

	$ret = '';

	# If it's a new day, flush the cache and update $this->lastdate
	if ( $date !== $this->lastdate ) {
	# Process current cache (uses $this->lastdate to generate a heading)
	$ret = $this->recentChangesBlock();
	$this->rc_cache = [];
	$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 );
	$this->rc_cache[$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 ) {
	$recentChangesFlags = $this->getConfig()->get( MainConfigNames::RecentChangesFlags );

	# Add the namespace and title of the block as part of the class
	$tableClasses = [ 'mw-enhanced-rc', 'mw-changeslist-line' ];
	if ( $block[0]->mAttribs['rc_log_type'] ) {
	# Log entry
	$tableClasses[] = 'mw-changeslist-log';
	$tableClasses[] = Sanitizer::escapeClass( 'mw-changeslist-log-'
	. $block[0]->mAttribs['rc_log_type'] );
	} else {
	$tableClasses[] = 'mw-changeslist-edit';
	$tableClasses[] = Sanitizer::escapeClass( 'mw-changeslist-ns'
	. $block[0]->mAttribs['rc_namespace'] . '-' . $block[0]->mAttribs['rc_title'] );
	}
	if ( $block[0]->watched ) {
	$tableClasses[] = 'mw-changeslist-line-watched';
	} else {
	$tableClasses[] = 'mw-changeslist-line-not-watched';
	}

	# Collate list of users
	$usercounts = [];
	$userlinks = [];
	# Some catalyst variables...
	$namehidden = true;
	$allLogs = true;
	$RCShowChangedSize = $this->getConfig()->get( MainConfigNames::RCShowChangedSize );

	# Default values for RC flags
	$collectedRcFlags = [];
	foreach ( $recentChangesFlags as $key => $value ) {
	$flagGrouping = $value['grouping'] ?? 'any';
	switch ( $flagGrouping ) {
	case 'all':
	$collectedRcFlags[$key] = true;
	break;
	case 'any':
	$collectedRcFlags[$key] = false;
	break;
	default:
	throw new DomainException( "Unknown grouping type \"{$flagGrouping}\"" );
	}
	}
	foreach ( $block as $rcObj ) {
	// If all log actions to this page were hidden, then don't
	// give the name of the affected page for this block!
	if ( !static::isDeleted( $rcObj, LogPage::DELETED_ACTION ) ) {
	$namehidden = false;
	}
	$username = $rcObj->getPerformerIdentity()->getName();
	$userlink = $rcObj->userlink;
	if ( !isset( $usercounts[$username] ) ) {
	$usercounts[$username] = 0;
	$userlinks[$username] = $userlink;
	}
	if ( $rcObj->mAttribs['rc_type'] != RC_LOG ) {
	$allLogs = false;
	}

	$usercounts[$username]++;
	}

	# Sort the list and convert to text
	krsort( $usercounts );
	asort( $usercounts );
	$users = [];
	foreach ( $usercounts as $username => $count ) {
	$text = (string)$userlinks[$username];
	if ( $count > 1 ) {
	$formattedCount = $this->msg( 'ntimes' )->numParams( $count )->escaped();
	$text .= ' ' . $this->msg( 'parentheses' )->rawParams( $formattedCount )->escaped();
	}
	$users[] = $text;
	}

	# Article link
	$articleLink = '';
	$revDeletedMsg = false;
	if ( $namehidden ) {
	$revDeletedMsg = $this->msg( 'rev-deleted-event' )->escaped();
	} elseif ( $allLogs ) {
	$articleLink = $this->maybeWatchedLink( $block[0]->link, $block[0]->watched );
	} else {
	$articleLink = $this->getArticleLink(
	$block[0], $block[0]->unpatrolled, $block[0]->watched );
	}

	# Sub-entries
	$lines = [];
	$filterClasses = [];
	foreach ( $block as $i => $rcObj ) {
	$line = $this->getLineData( $block, $rcObj );
	if ( !$line ) {
	// completely ignore this RC entry if we don't want to render it
	unset( $block[$i] );
	continue;
	}

	// Roll up flags
	foreach ( $line['recentChangesFlagsRaw'] as $key => $value ) {
	$flagGrouping = ( $recentChangesFlags[$key]['grouping'] ?? 'any' );
	switch ( $flagGrouping ) {
	case 'all':
	if ( !$value ) {
	$collectedRcFlags[$key] = false;
	}
	break;
	case 'any':
	if ( $value ) {
	$collectedRcFlags[$key] = true;
	}
	break;
	default:
	throw new DomainException( "Unknown grouping type \"{$flagGrouping}\"" );
	}
	}

	// Roll up filter-based CSS classes
	$filterClasses = array_merge( $filterClasses, $this->getHTMLClassesForFilters( $rcObj ) );
	// Add classes for change tags separately, getHTMLClassesForFilters() doesn't add them
	$this->getTags( $rcObj, $filterClasses );
	$filterClasses = array_unique( $filterClasses );

	$lines[] = $line;
	}

	// 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 );
	$filterClasses = array_values( $filterClasses );

	if ( !$block \|\| !$lines ) {
	// if we can't show anything, don't display this block altogether
	return '';
	}

	$logText = $this->getLogText( $block, [], $allLogs,
	$collectedRcFlags['newpage'], $namehidden
	);

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

	$numberofWatchingusers = $this->numberofWatchingusers( $block[0]->numberofWatchingusers );
	$usersList = $this->msg( 'brackets' )->rawParams(
	implode( $this->message['semicolon-separator'], $users )
	)->escaped();

	$prefix = '';
	if ( is_callable( $this->changeLinePrefixer ) ) {
	$prefix = call_user_func( $this->changeLinePrefixer, $block[0], $this, true );
	}

	$templateParams = [
	'checkboxId' => 'mw-checkbox-' . base64_encode( random_bytes( 3 ) ),
	'articleLink' => $articleLink,
	'charDifference' => $charDifference,
	'collectedRcFlags' => $this->recentChangesFlags( $collectedRcFlags ),
	'filterClasses' => $filterClasses,
	'lines' => $lines,
	'logText' => $logText,
	'numberofWatchingusers' => $numberofWatchingusers,
	'prefix' => $prefix,
	'rev-deleted-event' => $revDeletedMsg,
	'tableClasses' => $tableClasses,
	'timestamp' => $block[0]->timestamp,
	'fullTimestamp' => $block[0]->getAttribute( 'rc_timestamp' ),
	'users' => $usersList,
	];

	$this->rcCacheIndex++;

	return $this->templateParser->processTemplate(
	'EnhancedChangesListGroup',
	$templateParams
	);
	}

	/**
	* @param RCCacheEntry[] $block
	* @param RCCacheEntry $rcObj
	* @param array $queryParams
	* @return array
	*/
	protected function getLineData( array $block, RCCacheEntry $rcObj, array $queryParams = [] ) {
	$RCShowChangedSize = $this->getConfig()->get( MainConfigNames::RCShowChangedSize );

	$type = $rcObj->mAttribs['rc_type'];
	$data = [];
	$lineParams = [ 'targetTitle' => $rcObj->getTitle() ];

	$classes = [ 'mw-enhanced-rc' ];
	if ( $rcObj->watched ) {
	$classes[] = 'mw-enhanced-watched';
	}
	$classes = array_merge( $classes, $this->getHTMLClasses( $rcObj, $rcObj->watched ) );

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

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

	# Log timestamp
	if ( $type == RC_LOG ) {
	$link = htmlspecialchars( $rcObj->timestamp );
	# Revision link
	} elseif ( !ChangesList::userCan( $rcObj, RevisionRecord::DELETED_TEXT, $this->getAuthority() ) ) {
	$link = Html::element( 'span', [ 'class' => 'history-deleted' ], $rcObj->timestamp );
	} else {
	$params = [];
	$params['curid'] = $rcObj->mAttribs['rc_cur_id'];
	if ( $rcObj->mAttribs['rc_this_oldid'] != 0 ) {
	$params['oldid'] = $rcObj->mAttribs['rc_this_oldid'];
	}
	// FIXME: The link has incorrect "title=" when rc_type = RC_CATEGORIZE.
	// rc_cur_id refers to the page that was categorized
	// whereas RecentChange::getTitle refers to the category.
	$link = $this->linkRenderer->makeKnownLink(
	$rcObj->getTitle(),
	$rcObj->timestamp,
	[],
	$params + $queryParams
	);
	if ( static::isDeleted( $rcObj, RevisionRecord::DELETED_TEXT ) ) {
	$link = '<span class="history-deleted">' . $link . '</span> ';
	}
	}
	$data['timestampLink'] = $link;

	$currentAndLastLinks = '';
	if ( $type == RC_EDIT \|\| $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 ( $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 );
	if ( $type == RC_CATEGORIZE ) {
	$data['historyLink'] = $this->getDiffHistLinks( $rcObj, false );
	}
	# Rollback, thanks etc...
	$data['rollback'] = $this->getRollback( $rcObj );
	}

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

	$attribs = $this->getDataAttributes( $rcObj );

	// give the hook a chance to modify the data
	$success = $this->getHookRunner()->onEnhancedChangesListModifyLineData(
	$this, $data, $block, $rcObj, $classes, $attribs );
	if ( !$success ) {
	// skip entry if hook aborted it
	return [];
	}
	$attribs = array_filter( $attribs,
	[ Sanitizer::class, 'isReservedDataAttribute' ],
	ARRAY_FILTER_USE_KEY
	);

	$lineParams['recentChangesFlagsRaw'] = [];
	if ( isset( $data['recentChangesFlags'] ) ) {
	$lineParams['recentChangesFlags'] = $this->recentChangesFlags( $data['recentChangesFlags'] );
	# FIXME: This is used by logic, don't return it in the template params.
	$lineParams['recentChangesFlagsRaw'] = $data['recentChangesFlags'];
	unset( $data['recentChangesFlags'] );
	}

	if ( isset( $data['timestampLink'] ) ) {
	$lineParams['timestampLink'] = $data['timestampLink'];
	unset( $data['timestampLink'] );
	}

	$lineParams['classes'] = array_values( $classes );
	$lineParams['attribs'] = Html::expandAttributes( $attribs );

	// everything else: makes it easier for extensions to add or remove data
	$lineParams['data'] = array_values( $data );

	return $lineParams;
	}

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

	// Changes message
	static $nchanges = [];
	static $sinceLastVisitMsg = [];

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

	$sinceLast = 0;
	$unvisitedOldid = null;
	$currentRevision = 0;
	$previousRevision = 0;
	$curId = 0;
	$allCategorization = true;
	/** @var RCCacheEntry $rcObj */
	foreach ( $block as $rcObj ) {
	// Fields of categorization entries refer to the changed page
	// rather than the category for which we are building the log text.
	if ( $rcObj->mAttribs['rc_type'] == RC_CATEGORIZE ) {
	continue;
	}

	$allCategorization = false;
	$previousRevision = $rcObj->mAttribs['rc_last_oldid'];
	// Same logic as below inside main foreach
	if ( $rcObj->watched ) {
	$sinceLast++;
	$unvisitedOldid = $previousRevision;
	}
	if ( !$currentRevision ) {
	$currentRevision = $rcObj->mAttribs['rc_this_oldid'];
	}
	if ( !$curId ) {
	$curId = $rcObj->mAttribs['rc_cur_id'];
	}
	}

	// Total change link
	$links = [];
	$title = $block[0]->getTitle();
	if ( !$allLogs ) {
	// TODO: Disable the link if the user cannot see it (rc_deleted).
	// Beware of possibly interspersed categorization entries.
	if ( $isnew \|\| $allCategorization ) {
	$links['total-changes'] = Html::rawElement( 'span', [], $nchanges[$n] );
	} else {
	$links['total-changes'] = Html::rawElement( 'span', [],
	$this->linkRenderer->makeKnownLink(
	$title,
	new HtmlArmor( $nchanges[$n] ),
	[ 'class' => 'mw-changeslist-groupdiff' ],
	$queryParams + [
	'curid' => $curId,
	'diff' => $currentRevision,
	'oldid' => $previousRevision,
	]
	)
	);
	}

	if (
	!$allCategorization &&
	$sinceLast > 0 &&
	$sinceLast < $n
	) {
	if ( !isset( $sinceLastVisitMsg[$sinceLast] ) ) {
	$sinceLastVisitMsg[$sinceLast] =
	$this->msg( 'enhancedrc-since-last-visit' )->numParams( $sinceLast )->escaped();
	}
	$links['total-changes-since-last'] = Html::rawElement( 'span', [],
	$this->linkRenderer->makeKnownLink(
	$title,
	new HtmlArmor( $sinceLastVisitMsg[$sinceLast] ),
	[ 'class' => 'mw-changeslist-groupdiff' ],
	$queryParams + [
	'curid' => $curId,
	'diff' => $currentRevision,
	'oldid' => $unvisitedOldid,
	]
	)
	);
	}
	}

	// History
	if ( $allLogs \|\| $allCategorization ) {
	// don't show history link for logs
	} elseif ( $namehidden \|\| !$title->exists() ) {
	$links['history'] = Html::rawElement( 'span', [], $this->message['enhancedrc-history'] );
	} else {
	$links['history'] = Html::rawElement( 'span', [],
	$this->linkRenderer->makeKnownLink(
	$title,
	new HtmlArmor( $this->message['enhancedrc-history'] ),
	[ 'class' => 'mw-changeslist-history' ],
	[
	'curid' => $curId,
	'action' => 'history',
	] + $queryParams
	)
	);
	}

	// Allow others to alter, remove or add to these links
	$this->getHookRunner()->onEnhancedChangesList__getLogText( $this, $links, $block );

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

	$logtext = Html::rawElement( 'span', [ 'class' => 'mw-changeslist-links' ],
	implode( ' ', $links ) );
	return ' ' . $logtext;
	}

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

	$type = $rcObj->mAttribs['rc_type'];
	$logType = $rcObj->mAttribs['rc_log_type'];
	$classes = $this->getHTMLClasses( $rcObj, $rcObj->watched );
	$classes[] = 'mw-enhanced-rc';

	if ( $logType ) {
	# Log entry
	$classes[] = 'mw-changeslist-log';
	$classes[] = Sanitizer::escapeClass( 'mw-changeslist-log-' . $logType );
	} else {
	$classes[] = 'mw-changeslist-edit';
	$classes[] = Sanitizer::escapeClass( 'mw-changeslist-ns' .
	$rcObj->mAttribs['rc_namespace'] . '-' . $rcObj->mAttribs['rc_title'] );
	}

	# Flag and Timestamp
	$data['recentChangesFlags'] = [
	'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'] = htmlspecialchars( $rcObj->timestamp );

	# Article or log link
	if ( $logType ) {
	$logPage = new LogPage( $logType );
	$logTitle = SpecialPage::getTitleFor( 'Log', $logType );
	$logName = $logPage->getName()->text();
	$data['logLink'] = Html::rawElement( 'span', [ 'class' => 'mw-changeslist-links' ],
	$this->linkRenderer->makeKnownLink( $logTitle, $logName )
	);
	} else {
	$data['articleLink'] = $this->getArticleLink( $rcObj, $rcObj->unpatrolled, $rcObj->watched );
	}

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

	# Character diff
	if ( $this->getConfig()->get( MainConfigNames::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, false );
	}
	$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 );

	$data['attribs'] = array_merge( $this->getDataAttributes( $rcObj ), [ 'class' => $classes ] );

	// give the hook a chance to modify the data
	$success = $this->getHookRunner()->onEnhancedChangesListModifyBlockLineData(
	$this, $data, $rcObj );
	if ( !$success ) {
	// skip entry if hook aborted it
	return '';
	}
	$attribs = $data['attribs'];
	unset( $data['attribs'] );
	$attribs = array_filter( $attribs, static function ( $key ) {
	return $key === 'class' \|\| Sanitizer::isReservedDataAttribute( $key );
	}, ARRAY_FILTER_USE_KEY );

	$prefix = '';
	if ( is_callable( $this->changeLinePrefixer ) ) {
	$prefix = call_user_func( $this->changeLinePrefixer, $rcObj, $this, false );
	}

	$line = Html::openElement( 'table', $attribs ) . Html::openElement( 'tr' );
	// Highlight block
	$line .= Html::rawElement( 'td', [],
	$this->getHighlightsContainerDiv()
	);

	$line .= Html::rawElement( 'td', [], '<span class="mw-enhancedchanges-arrow-space"></span>' );
	$line .= Html::rawElement( 'td', [ 'class' => 'mw-changeslist-line-prefix' ], $prefix );
	$line .= '<td class="mw-enhanced-rc" colspan="2">';

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

	if ( isset( $data['timestampLink'] ) ) {
	$line .= "\u{00A0}" . $data['timestampLink'];
	unset( $data['timestampLink'] );
	}
	$line .= "\u{00A0}</td>";
	$line .= Html::openElement( 'td', [
	'class' => 'mw-changeslist-line-inner',
	// Used for reliable determination of the affiliated page
	'data-target-page' => $rcObj->getTitle(),
	] );

	// everything else: makes it easier for extensions to add or remove data
	foreach ( $data as $key => $dataItem ) {
	$line .= Html::rawElement( 'span', [
	'class' => 'mw-changeslist-line-inner-' . $key,
	], $dataItem );
	}

	$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 bool\|array\|null $query deprecated
	* @param bool\|null $useParentheses (optional) Wrap comments in parentheses where needed
	* @return string HTML
	*/
	public function getDiffHistLinks( RCCacheEntry $rc, $query = null, $useParentheses = null ) {
	if ( is_bool( $query ) ) {
	$useParentheses = $query;
	} elseif ( $query !== null ) {
	wfDeprecated( __METHOD__ . ' with $query parameter', '1.36' );
	}
	$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( $rc->getAttribute( 'rc_cur_id' ) );
	if ( !$pageTitle ) {
	// The page has been deleted, but the RC entry
	// deletion job has not run yet. Just skip.
	return '';
	}
	}

	$histLink = $this->linkRenderer->makeKnownLink(
	$pageTitle,
	new HtmlArmor( $this->message['hist'] ),
	[ 'class' => 'mw-changeslist-history' ],
	[
	'curid' => $rc->getAttribute( 'rc_cur_id' ),
	'action' => 'history'
	]
	);
	if ( $useParentheses !== false ) {
	$retVal = $this->msg( 'parentheses' )
	->rawParams( $rc->difflink . $this->message['pipe-separator']
	. $histLink )->escaped();
	} else {
	$retVal = Html::rawElement( 'span', [ 'class' => 'mw-changeslist-links' ],
	Html::rawElement( 'span', [], $rc->difflink ) .
	Html::rawElement( 'span', [], $histLink )
	);
	}
	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 );
	}
	}

	if ( $blockOut === '' ) {
	return '';
	}
	// $this->lastdate is kept up to date by recentChangesLine()
	return Html::element( 'h4', [], $this->lastdate ) . "\n<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>';
	}
	}

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