wiki.techinc.nl/includes/RecentChange.php

702 lines
22 KiB
PHP

<?php
/**
* Utility class for creating new RC entries
* mAttribs:
* rc_id id of the row in the recentchanges table
* rc_timestamp time the entry was made
* rc_cur_time timestamp on the cur row
* rc_namespace namespace #
* rc_title non-prefixed db key
* rc_type is new entry, used to determine whether updating is necessary
* rc_minor is minor
* rc_cur_id page_id of associated page entry
* rc_user user id who made the entry
* rc_user_text user name who made the entry
* rc_comment edit summary
* rc_this_oldid rev_id associated with this entry (or zero)
* rc_last_oldid rev_id associated with the entry before this one (or zero)
* rc_bot is bot, hidden
* rc_ip IP address of the user in dotted quad notation
* rc_new obsolete, use rc_type==RC_NEW
* rc_patrolled boolean whether or not someone has marked this edit as patrolled
* rc_old_len integer byte length of the text before the edit
* rc_new_len the same after the edit
* rc_deleted partial deletion
* rc_logid the log_id value for this log entry (or zero)
* rc_log_type the log type (or null)
* rc_log_action the log action (or null)
* rc_params log params
*
* mExtra:
* prefixedDBkey prefixed db key, used by external app via msg queue
* lastTimestamp timestamp of previous entry, used in WHERE clause during update
* lang the interwiki prefix, automatically set in save()
* oldSize text size before the change
* newSize text size after the change
*
* temporary: not stored in the database
* notificationtimestamp
* numberofWatchingusers
*
* @todo document functions and variables
*/
class RecentChange
{
var $mAttribs = array(), $mExtra = array();
var $mTitle = false, $mMovedToTitle = false;
var $numberofWatchingusers = 0 ; # Dummy to prevent error message in SpecialRecentchangeslinked
# Factory methods
public static function newFromRow( $row ) {
$rc = new RecentChange;
$rc->loadFromRow( $row );
return $rc;
}
public static function newFromCurRow( $row ) {
$rc = new RecentChange;
$rc->loadFromCurRow( $row );
$rc->notificationtimestamp = false;
$rc->numberofWatchingusers = false;
return $rc;
}
/**
* Obtain the recent change with a given rc_id value
*
* @param $rcid rc_id value to retrieve
* @return RecentChange
*/
public static function newFromId( $rcid ) {
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->select( 'recentchanges', '*', array( 'rc_id' => $rcid ), __METHOD__ );
if( $res && $dbr->numRows( $res ) > 0 ) {
$row = $dbr->fetchObject( $res );
$dbr->freeResult( $res );
return self::newFromRow( $row );
} else {
return NULL;
}
}
/**
* Find the first recent change matching some specific conditions
*
* @param array $conds Array of conditions
* @param mixed $fname Override the method name in profiling/logs
* @return RecentChange
*/
public static function newFromConds( $conds, $fname = false ) {
if( $fname === false )
$fname = __METHOD__;
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->select(
'recentchanges',
'*',
$conds,
$fname
);
if( $res instanceof ResultWrapper && $res->numRows() > 0 ) {
$row = $res->fetchObject();
$res->free();
return self::newFromRow( $row );
}
return null;
}
# Accessors
public function setAttribs( $attribs ) {
$this->mAttribs = $attribs;
}
public function setExtra( $extra ) {
$this->mExtra = $extra;
}
public function &getTitle() {
if( $this->mTitle === false ) {
$this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
}
return $this->mTitle;
}
public function getMovedToTitle() {
if( $this->mMovedToTitle === false ) {
$this->mMovedToTitle = Title::makeTitle( $this->mAttribs['rc_moved_to_ns'],
$this->mAttribs['rc_moved_to_title'] );
}
return $this->mMovedToTitle;
}
# Writes the data in this object to the database
public function save() {
global $wgLocalInterwiki, $wgPutIPinRC, $wgRC2UDPAddress, $wgRC2UDPOmitBots;
$fname = 'RecentChange::save';
$dbw = wfGetDB( DB_MASTER );
if( !is_array($this->mExtra) ) {
$this->mExtra = array();
}
$this->mExtra['lang'] = $wgLocalInterwiki;
if( !$wgPutIPinRC ) {
$this->mAttribs['rc_ip'] = '';
}
# If our database is strict about IP addresses, use NULL instead of an empty string
if( $dbw->strictIPs() and $this->mAttribs['rc_ip'] == '' ) {
unset( $this->mAttribs['rc_ip'] );
}
# Fixup database timestamps
$this->mAttribs['rc_timestamp'] = $dbw->timestamp($this->mAttribs['rc_timestamp']);
$this->mAttribs['rc_cur_time'] = $dbw->timestamp($this->mAttribs['rc_cur_time']);
$this->mAttribs['rc_id'] = $dbw->nextSequenceValue( 'rc_rc_id_seq' );
## If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
if( $dbw->cascadingDeletes() and $this->mAttribs['rc_cur_id']==0 ) {
unset ( $this->mAttribs['rc_cur_id'] );
}
# Insert new row
$dbw->insert( 'recentchanges', $this->mAttribs, $fname );
# Set the ID
$this->mAttribs['rc_id'] = $dbw->insertId();
# Notify extensions
wfRunHooks( 'RecentChange_save', array( &$this ) );
# Notify external application via UDP
if( $wgRC2UDPAddress && ( !$this->mAttribs['rc_bot'] || !$wgRC2UDPOmitBots ) ) {
self::sendToUDP( $this->getIRCLine() );
}
# E-mail notifications
global $wgUseEnotif, $wgShowUpdatedMarker, $wgUser;
if( $wgUseEnotif || $wgShowUpdatedMarker ) {
// Users
if( $this->mAttribs['rc_user'] ) {
$editor = ($wgUser->getId() == $this->mAttribs['rc_user']) ?
$wgUser : User::newFromID( $this->mAttribs['rc_user'] );
// Anons
} else {
$editor = ($wgUser->getName() == $this->mAttribs['rc_user_text']) ?
$wgUser : User::newFromName( $this->mAttribs['rc_user_text'], false );
}
# FIXME: this would be better as an extension hook
$enotif = new EmailNotification();
$title = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
$enotif->notifyOnPageChange( $editor, $title,
$this->mAttribs['rc_timestamp'],
$this->mAttribs['rc_comment'],
$this->mAttribs['rc_minor'],
$this->mAttribs['rc_last_oldid'] );
}
}
public function notifyRC2UDP() {
global $wgRC2UDPAddress, $wgRC2UDPOmitBots;
# Notify external application via UDP
if( $wgRC2UDPAddress && ( !$this->mAttribs['rc_bot'] || !$wgRC2UDPOmitBots ) ) {
self::sendToUDP( $this->getIRCLine() );
}
}
/**
* Send some text to UDP
* @param string $line
* @param string $prefix
* @param string $address
* @return bool success
*/
public static function sendToUDP( $line, $address = '', $prefix = '' ) {
global $wgRC2UDPAddress, $wgRC2UDPPrefix, $wgRC2UDPPort;
# Assume default for standard RC case
$address = $address ? $address : $wgRC2UDPAddress;
$prefix = $prefix ? $prefix : $wgRC2UDPPrefix;
# Notify external application via UDP
if( $address ) {
$conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
if( $conn ) {
$line = $prefix . $line;
wfDebug( __METHOD__ . ": sending UDP line: $line\n" );
socket_sendto( $conn, $line, strlen($line), 0, $address, $wgRC2UDPPort );
socket_close( $conn );
return true;
} else {
wfDebug( __METHOD__ . ": failed to create UDP socket\n" );
}
}
return false;
}
/**
* Remove newlines, carriage returns and decode html entites
* @param string $line
* @return string
*/
public static function cleanupForIRC( $text ) {
return Sanitizer::decodeCharReferences( str_replace( array( "\n", "\r" ), array( "", "" ), $text ) );
}
/**
* Mark a given change as patrolled
*
* @param mixed $change RecentChange or corresponding rc_id
* @param bool $auto for automatic patrol
* @return See doMarkPatrolled(), or null if $change is not an existing rc_id
*/
public static function markPatrolled( $change, $auto = false ) {
$change = $change instanceof RecentChange
? $change
: RecentChange::newFromId($change);
if( !$change instanceof RecentChange ) {
return null;
}
return $change->doMarkPatrolled( $auto );
}
/**
* Mark this RecentChange as patrolled
*
* NOTE: Can also return 'rcpatroldisabled', 'hookaborted' and 'markedaspatrollederror-noautopatrol' as errors
* @param bool $auto for automatic patrol
* @return array of permissions errors, see Title::getUserPermissionsErrors()
*/
public function doMarkPatrolled( $auto = false ) {
global $wgUser, $wgUseRCPatrol, $wgUseNPPatrol;
$errors = array();
// If recentchanges patrol is disabled, only new pages
// can be patrolled
if( !$wgUseRCPatrol && ( !$wgUseNPPatrol || $this->getAttribute('rc_type') != RC_NEW ) ) {
$errors[] = array('rcpatroldisabled');
}
// Automatic patrol needs "autopatrol", ordinary patrol needs "patrol"
$right = $auto ? 'autopatrol' : 'patrol';
$errors = array_merge( $errors, $this->getTitle()->getUserPermissionsErrors( $right, $wgUser ) );
if( !wfRunHooks('MarkPatrolled', array($this->getAttribute('rc_id'), &$wgUser, false)) ) {
$errors[] = array('hookaborted');
}
// Users without the 'autopatrol' right can't patrol their
// own revisions
if( $wgUser->getName() == $this->getAttribute('rc_user_text') && !$wgUser->isAllowed('autopatrol') ) {
$errors[] = array('markedaspatrollederror-noautopatrol');
}
if( $errors ) {
return $errors;
}
// If the change was patrolled already, do nothing
if( $this->getAttribute('rc_patrolled') ) {
return array();
}
// Actually set the 'patrolled' flag in RC
$this->reallyMarkPatrolled();
// Log this patrol event
PatrolLog::record( $this, $auto );
wfRunHooks( 'MarkPatrolledComplete', array($this->getAttribute('rc_id'), &$wgUser, false) );
return array();
}
/**
* Mark this RecentChange patrolled, without error checking
* @return int Number of affected rows
*/
public function reallyMarkPatrolled() {
$dbw = wfGetDB( DB_MASTER );
$dbw->update(
'recentchanges',
array(
'rc_patrolled' => 1
),
array(
'rc_id' => $this->getAttribute('rc_id')
),
__METHOD__
);
return $dbw->affectedRows();
}
# Makes an entry in the database corresponding to an edit
public static function notifyEdit( $timestamp, &$title, $minor, &$user, $comment, $oldId,
$lastTimestamp, $bot, $ip='', $oldSize=0, $newSize=0, $newId=0, $patrol=0 )
{
if( !$ip ) {
$ip = wfGetIP();
if( !$ip ) $ip = '';
}
$rc = new RecentChange;
$rc->mAttribs = array(
'rc_timestamp' => $timestamp,
'rc_cur_time' => $timestamp,
'rc_namespace' => $title->getNamespace(),
'rc_title' => $title->getDBkey(),
'rc_type' => RC_EDIT,
'rc_minor' => $minor ? 1 : 0,
'rc_cur_id' => $title->getArticleID(),
'rc_user' => $user->getId(),
'rc_user_text' => $user->getName(),
'rc_comment' => $comment,
'rc_this_oldid' => $newId,
'rc_last_oldid' => $oldId,
'rc_bot' => $bot ? 1 : 0,
'rc_moved_to_ns' => 0,
'rc_moved_to_title' => '',
'rc_ip' => $ip,
'rc_patrolled' => intval($patrol),
'rc_new' => 0, # obsolete
'rc_old_len' => $oldSize,
'rc_new_len' => $newSize,
'rc_deleted' => 0,
'rc_logid' => 0,
'rc_log_type' => null,
'rc_log_action' => '',
'rc_params' => ''
);
$rc->mExtra = array(
'prefixedDBkey' => $title->getPrefixedDBkey(),
'lastTimestamp' => $lastTimestamp,
'oldSize' => $oldSize,
'newSize' => $newSize,
);
$rc->save();
return $rc;
}
/**
* Makes an entry in the database corresponding to page creation
* Note: the title object must be loaded with the new id using resetArticleID()
* @todo Document parameters and return
*/
public static function notifyNew( $timestamp, &$title, $minor, &$user, $comment, $bot,
$ip='', $size=0, $newId=0, $patrol=0 )
{
if( !$ip ) {
$ip = wfGetIP();
if( !$ip ) $ip = '';
}
$rc = new RecentChange;
$rc->mAttribs = array(
'rc_timestamp' => $timestamp,
'rc_cur_time' => $timestamp,
'rc_namespace' => $title->getNamespace(),
'rc_title' => $title->getDBkey(),
'rc_type' => RC_NEW,
'rc_minor' => $minor ? 1 : 0,
'rc_cur_id' => $title->getArticleID(),
'rc_user' => $user->getId(),
'rc_user_text' => $user->getName(),
'rc_comment' => $comment,
'rc_this_oldid' => $newId,
'rc_last_oldid' => 0,
'rc_bot' => $bot ? 1 : 0,
'rc_moved_to_ns' => 0,
'rc_moved_to_title' => '',
'rc_ip' => $ip,
'rc_patrolled' => intval($patrol),
'rc_new' => 1, # obsolete
'rc_old_len' => 0,
'rc_new_len' => $size,
'rc_deleted' => 0,
'rc_logid' => 0,
'rc_log_type' => null,
'rc_log_action' => '',
'rc_params' => ''
);
$rc->mExtra = array(
'prefixedDBkey' => $title->getPrefixedDBkey(),
'lastTimestamp' => 0,
'oldSize' => 0,
'newSize' => $size
);
$rc->save();
return $rc;
}
# Makes an entry in the database corresponding to a rename
public static function notifyMove( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='', $overRedir = false )
{
global $wgRequest;
if( !$ip ) {
$ip = wfGetIP();
if( !$ip ) $ip = '';
}
$rc = new RecentChange;
$rc->mAttribs = array(
'rc_timestamp' => $timestamp,
'rc_cur_time' => $timestamp,
'rc_namespace' => $oldTitle->getNamespace(),
'rc_title' => $oldTitle->getDBkey(),
'rc_type' => $overRedir ? RC_MOVE_OVER_REDIRECT : RC_MOVE,
'rc_minor' => 0,
'rc_cur_id' => $oldTitle->getArticleID(),
'rc_user' => $user->getId(),
'rc_user_text' => $user->getName(),
'rc_comment' => $comment,
'rc_this_oldid' => 0,
'rc_last_oldid' => 0,
'rc_bot' => $user->isAllowed( 'bot' ) ? $wgRequest->getBool( 'bot' , true ) : 0,
'rc_moved_to_ns' => $newTitle->getNamespace(),
'rc_moved_to_title' => $newTitle->getDBkey(),
'rc_ip' => $ip,
'rc_new' => 0, # obsolete
'rc_patrolled' => 1,
'rc_old_len' => NULL,
'rc_new_len' => NULL,
'rc_deleted' => 0,
'rc_logid' => 0, # notifyMove not used anymore
'rc_log_type' => null,
'rc_log_action' => '',
'rc_params' => ''
);
$rc->mExtra = array(
'prefixedDBkey' => $oldTitle->getPrefixedDBkey(),
'lastTimestamp' => 0,
'prefixedMoveTo' => $newTitle->getPrefixedDBkey()
);
$rc->save();
}
public static function notifyMoveToNew( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, false );
}
public static function notifyMoveOverRedirect( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, true );
}
public static function notifyLog( $timestamp, &$title, &$user, $actionComment, $ip='', $type,
$action, $target, $logComment, $params, $newId=0 )
{
global $wgLogRestrictions;
# Don't add private logs to RC!
if( isset($wgLogRestrictions[$type]) && $wgLogRestrictions[$type] != '*' ) {
return false;
}
$rc = self::newLogEntry( $timestamp, $title, $user, $actionComment, $ip, $type, $action,
$target, $logComment, $params, $newId );
$rc->save();
return true;
}
public static function newLogEntry( $timestamp, &$title, &$user, $actionComment, $ip='',
$type, $action, $target, $logComment, $params, $newId=0 )
{
global $wgRequest;
if( !$ip ) {
$ip = wfGetIP();
if( !$ip ) $ip = '';
}
$rc = new RecentChange;
$rc->mAttribs = array(
'rc_timestamp' => $timestamp,
'rc_cur_time' => $timestamp,
'rc_namespace' => $target->getNamespace(),
'rc_title' => $target->getDBkey(),
'rc_type' => RC_LOG,
'rc_minor' => 0,
'rc_cur_id' => $target->getArticleID(),
'rc_user' => $user->getId(),
'rc_user_text' => $user->getName(),
'rc_comment' => $logComment,
'rc_this_oldid' => 0,
'rc_last_oldid' => 0,
'rc_bot' => $user->isAllowed( 'bot' ) ? $wgRequest->getBool( 'bot', true ) : 0,
'rc_moved_to_ns' => 0,
'rc_moved_to_title' => '',
'rc_ip' => $ip,
'rc_patrolled' => 1,
'rc_new' => 0, # obsolete
'rc_old_len' => NULL,
'rc_new_len' => NULL,
'rc_deleted' => 0,
'rc_logid' => $newId,
'rc_log_type' => $type,
'rc_log_action' => $action,
'rc_params' => $params
);
$rc->mExtra = array(
'prefixedDBkey' => $title->getPrefixedDBkey(),
'lastTimestamp' => 0,
'actionComment' => $actionComment, // the comment appended to the action, passed from LogPage
);
return $rc;
}
# Initialises the members of this object from a mysql row object
public function loadFromRow( $row ) {
$this->mAttribs = get_object_vars( $row );
$this->mAttribs['rc_timestamp'] = wfTimestamp(TS_MW, $this->mAttribs['rc_timestamp']);
$this->mAttribs['rc_deleted'] = $row->rc_deleted; // MUST be set
}
# Makes a pseudo-RC entry from a cur row
public function loadFromCurRow( $row ) {
$this->mAttribs = array(
'rc_timestamp' => wfTimestamp(TS_MW, $row->rev_timestamp),
'rc_cur_time' => $row->rev_timestamp,
'rc_user' => $row->rev_user,
'rc_user_text' => $row->rev_user_text,
'rc_namespace' => $row->page_namespace,
'rc_title' => $row->page_title,
'rc_comment' => $row->rev_comment,
'rc_minor' => $row->rev_minor_edit ? 1 : 0,
'rc_type' => $row->page_is_new ? RC_NEW : RC_EDIT,
'rc_cur_id' => $row->page_id,
'rc_this_oldid' => $row->rev_id,
'rc_last_oldid' => isset($row->rc_last_oldid) ? $row->rc_last_oldid : 0,
'rc_bot' => 0,
'rc_moved_to_ns' => 0,
'rc_moved_to_title' => '',
'rc_ip' => '',
'rc_id' => $row->rc_id,
'rc_patrolled' => $row->rc_patrolled,
'rc_new' => $row->page_is_new, # obsolete
'rc_old_len' => $row->rc_old_len,
'rc_new_len' => $row->rc_new_len,
'rc_params' => isset($row->rc_params) ? $row->rc_params : '',
'rc_log_type' => isset($row->rc_log_type) ? $row->rc_log_type : null,
'rc_log_action' => isset($row->rc_log_action) ? $row->rc_log_action : null,
'rc_log_id' => isset($row->rc_log_id) ? $row->rc_log_id: 0,
'rc_deleted' => $row->rc_deleted // MUST be set
);
}
/**
* Get an attribute value
*
* @param $name Attribute name
* @return mixed
*/
public function getAttribute( $name ) {
return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : NULL;
}
/**
* Gets the end part of the diff URL associated with this object
* Blank if no diff link should be displayed
*/
public function diffLinkTrail( $forceCur ) {
if( $this->mAttribs['rc_type'] == RC_EDIT ) {
$trail = "curid=" . (int)($this->mAttribs['rc_cur_id']) .
"&oldid=" . (int)($this->mAttribs['rc_last_oldid']);
if( $forceCur ) {
$trail .= '&diff=0' ;
} else {
$trail .= '&diff=' . (int)($this->mAttribs['rc_this_oldid']);
}
} else {
$trail = '';
}
return $trail;
}
public function getIRCLine() {
global $wgUseRCPatrol, $wgUseNPPatrol, $wgRC2UDPInterwikiPrefix, $wgLocalInterwiki;
// FIXME: Would be good to replace these 2 extract() calls with something more explicit
// e.g. list ($rc_type, $rc_id) = array_values ($this->mAttribs); [or something like that]
extract($this->mAttribs);
extract($this->mExtra);
if( $rc_type == RC_LOG ) {
$titleObj = Title::newFromText( "Log/$rc_log_type", NS_SPECIAL );
} else {
$titleObj =& $this->getTitle();
}
$title = $titleObj->getPrefixedText();
$title = self::cleanupForIRC( $title );
if( $rc_type == RC_LOG ) {
$url = '';
} else {
if( $rc_type == RC_NEW ) {
$url = "oldid=$rc_this_oldid";
} else {
$url = "diff=$rc_this_oldid&oldid=$rc_last_oldid";
}
if( $wgUseRCPatrol || ($rc_type == RC_NEW && $wgUseNPPatrol) ) {
$url .= "&rcid=$rc_id";
}
// XXX: *HACK* this should use getFullURL(), hacked for SSL madness --brion 2005-12-26
// XXX: *HACK^2* the preg_replace() undoes much of what getInternalURL() does, but we
// XXX: need to call it so that URL paths on the Wikimedia secure server can be fixed
// XXX: by a custom GetInternalURL hook --vyznev 2008-12-10
$url = preg_replace( '/title=[^&]*&/', '', $titleObj->getInternalURL( $url ) );
}
if( isset( $oldSize ) && isset( $newSize ) ) {
$szdiff = $newSize - $oldSize;
if($szdiff < -500) {
$szdiff = "\002$szdiff\002";
} elseif($szdiff >= 0) {
$szdiff = '+' . $szdiff ;
}
$szdiff = '(' . $szdiff . ')' ;
} else {
$szdiff = '';
}
$user = self::cleanupForIRC( $rc_user_text );
if( $rc_type == RC_LOG ) {
$targetText = $this->getTitle()->getPrefixedText();
$comment = self::cleanupForIRC( str_replace("[[$targetText]]","[[\00302$targetText\00310]]",$actionComment) );
$flag = $rc_log_action;
} else {
$comment = self::cleanupForIRC( $rc_comment );
$flag = '';
if( !$rc_patrolled && ($wgUseRCPatrol || $rc_new && $wgUseNPPatrol) ) {
$flag .= '!';
}
$flag .= ($rc_new ? "N" : "") . ($rc_minor ? "M" : "") . ($rc_bot ? "B" : "");
}
if ( $wgRC2UDPInterwikiPrefix === true ) {
$prefix = $wgLocalInterwiki;
} elseif ( $wgRC2UDPInterwikiPrefix ) {
$prefix = $wgRC2UDPInterwikiPrefix;
} else {
$prefix = false;
}
if ( $prefix !== false ) {
$titleString = "\00314[[\00303$prefix:\00307$title\00314]]";
} else {
$titleString = "\00314[[\00307$title\00314]]";
}
# see http://www.irssi.org/documentation/formats for some colour codes. prefix is \003,
# no colour (\003) switches back to the term default
$fullString = "$titleString\0034 $flag\00310 " .
"\00302$url\003 \0035*\003 \00303$user\003 \0035*\003 $szdiff \00310$comment\003\n";
return $fullString;
}
/**
* Returns the change size (HTML).
* The lengths can be given optionally.
*/
public function getCharacterDifference( $old = 0, $new = 0 ) {
if( $old === 0 ) {
$old = $this->mAttribs['rc_old_len'];
}
if( $new === 0 ) {
$new = $this->mAttribs['rc_new_len'];
}
if( $old === NULL || $new === NULL ) {
return '';
}
return ChangesList::showCharacterDifference( $old, $new );
}
}