includes/RecentChange.php

   1 <?php
   2 /**
   3  *
   4  */
   5
   6 /**
   7  * Utility class for creating new RC entries
   8  * mAttribs:
   9  *      rc_id           id of the row in the recentchanges table
  10  *      rc_timestamp    time the entry was made
  11  *      rc_cur_time     timestamp on the cur row
  12  *      rc_namespace    namespace #
  13  *      rc_title        non-prefixed db key
  14  *      rc_type         is new entry, used to determine whether updating is necessary
  15  *      rc_minor        is minor
  16  *      rc_cur_id       page_id of associated page entry
  17  *      rc_user         user id who made the entry
  18  *      rc_user_text    user name who made the entry
  19  *      rc_comment      edit summary
  20  *      rc_this_oldid   rev_id associated with this entry (or zero)
  21  *      rc_last_oldid   rev_id associated with the entry before this one (or zero)
  22  *      rc_bot          is bot, hidden
  23  *      rc_ip           IP address of the user in dotted quad notation
  24  *      rc_new          obsolete, use rc_type==RC_NEW
  25  *      rc_patrolled    boolean whether or not someone has marked this edit as patrolled
  26  *      rc_old_len      integer byte length of the text before the edit
  27  *      rc_new_len      the same after the edit
  28  *
  29  * mExtra:
  30  *      prefixedDBkey   prefixed db key, used by external app via msg queue
  31  *      lastTimestamp   timestamp of previous entry, used in WHERE clause during update
  32  *      lang            the interwiki prefix, automatically set in save()
  33  *  oldSize         text size before the change
  34  *  newSize         text size after the change
  35  *
  36  * temporary:           not stored in the database
  37  *      notificationtimestamp
  38  *      numberofWatchingusers
  39  *
  40  * @todo document functions and variables
  41  */
  42 class RecentChange
  43 {
  44         var $mAttribs = array(), $mExtra = array();
  45         var $mTitle = false, $mMovedToTitle = false;
  46         var $numberofWatchingusers = 0 ; # Dummy to prevent error message in SpecialRecentchangeslinked
  47
  48         # Factory methods
  49
  50         public static function newFromRow( $row )
  51         {
  52                 $rc = new RecentChange;
  53                 $rc->loadFromRow( $row );
  54                 return $rc;
  55         }
  56
  57         public static function newFromCurRow( $row, $rc_this_oldid = 0 )
  58         {
  59                 $rc = new RecentChange;
  60                 $rc->loadFromCurRow( $row, $rc_this_oldid );
  61                 $rc->notificationtimestamp = false;
  62                 $rc->numberofWatchingusers = false;
  63                 return $rc;
  64         }
  65
  66         /**
  67          * Obtain the recent change with a given rc_id value
  68          *
  69          * @param $rcid rc_id value to retrieve
  70          * @return RecentChange
  71          */
  72         public static function newFromId( $rcid ) {
  73                 $dbr = wfGetDB( DB_SLAVE );
  74                 $res = $dbr->select( 'recentchanges', '*', array( 'rc_id' => $rcid ), __METHOD__ );
  75                 if( $res && $dbr->numRows( $res ) > 0 ) {
  76                         $row = $dbr->fetchObject( $res );
  77                         $dbr->freeResult( $res );
  78                         return self::newFromRow( $row );
  79                 } else {
  80                         return NULL;
  81                 }
  82         }
  83
  84         # Accessors
  85
  86         function setAttribs( $attribs )
  87         {
  88                 $this->mAttribs = $attribs;
  89         }
  90
  91         function setExtra( $extra )
  92         {
  93                 $this->mExtra = $extra;
  94         }
  95
  96         function &getTitle()
  97         {
  98                 if ( $this->mTitle === false ) {
  99                         $this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
 100                 }
 101                 return $this->mTitle;
 102         }
 103
 104         function getMovedToTitle()
 105         {
 106                 if ( $this->mMovedToTitle === false ) {
 107                         $this->mMovedToTitle = Title::makeTitle( $this->mAttribs['rc_moved_to_ns'],
 108                                 $this->mAttribs['rc_moved_to_title'] );
 109                 }
 110                 return $this->mMovedToTitle;
 111         }
 112
 113         # Writes the data in this object to the database
 114         function save()
 115         {
 116                 global $wgLocalInterwiki, $wgPutIPinRC, $wgRC2UDPAddress, $wgRC2UDPPort, $wgRC2UDPPrefix;
 117                 $fname = 'RecentChange::save';
 118
 119                 $dbw = wfGetDB( DB_MASTER );
 120                 if ( !is_array($this->mExtra) ) {
 121                         $this->mExtra = array();
 122                 }
 123                 $this->mExtra['lang'] = $wgLocalInterwiki;
 124
 125                 if ( !$wgPutIPinRC ) {
 126                         $this->mAttribs['rc_ip'] = '';
 127                 }
 128
 129                 ## If our database is strict about IP addresses, use NULL instead of an empty string
 130                 if ( $dbw->strictIPs() and $this->mAttribs['rc_ip'] == '' ) {
 131                         unset( $this->mAttribs['rc_ip'] );
 132                 }
 133
 134                 # Fixup database timestamps
 135                 $this->mAttribs['rc_timestamp'] = $dbw->timestamp($this->mAttribs['rc_timestamp']);
 136                 $this->mAttribs['rc_cur_time'] = $dbw->timestamp($this->mAttribs['rc_cur_time']);
 137                 $this->mAttribs['rc_id'] = $dbw->nextSequenceValue( 'rc_rc_id_seq' );
 138
 139                 ## If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
 140                 if ( $dbw->cascadingDeletes() and $this->mAttribs['rc_cur_id']==0 ) {
 141                         unset ( $this->mAttribs['rc_cur_id'] );
 142                 }
 143
 144                 # Insert new row
 145                 $dbw->insert( 'recentchanges', $this->mAttribs, $fname );
 146
 147                 # Set the ID
 148                 $this->mAttribs['rc_id'] = $dbw->insertId();
 149
 150                 # Update old rows, if necessary
 151                 if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
 152                         $lastTime = $this->mExtra['lastTimestamp'];
 153                         #$now = $this->mAttribs['rc_timestamp'];
 154                         #$curId = $this->mAttribs['rc_cur_id'];
 155
 156                         # Don't bother looking for entries that have probably
 157                         # been purged, it just locks up the indexes needlessly.
 158                         global $wgRCMaxAge;
 159                         $age = time() - wfTimestamp( TS_UNIX, $lastTime );
 160                         if( $age < $wgRCMaxAge ) {
 161                                 # live hack, will commit once tested - kate
 162                                 # Update rc_this_oldid for the entries which were current
 163                                 #
 164                                 #$oldid = $this->mAttribs['rc_last_oldid'];
 165                                 #$ns = $this->mAttribs['rc_namespace'];
 166                                 #$title = $this->mAttribs['rc_title'];
 167                                 #
 168                                 #$dbw->update( 'recentchanges',
 169                                 #       array( /* SET */
 170                                 #               'rc_this_oldid' => $oldid
 171                                 #       ), array( /* WHERE */
 172                                 #               'rc_namespace' => $ns,
 173                                 #               'rc_title' => $title,
 174                                 #               'rc_timestamp' => $dbw->timestamp( $lastTime )
 175                                 #       ), $fname
 176                                 #);
 177                         }
 178
 179                         # Update rc_cur_time
 180                         #$dbw->update( 'recentchanges', array( 'rc_cur_time' => $now ),
 181                         #       array( 'rc_cur_id' => $curId ), $fname );
 182                 }
 183
 184                 # Notify external application via UDP
 185                 if ( $wgRC2UDPAddress ) {
 186                         $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
 187                         if ( $conn ) {
 188                                 $line = $wgRC2UDPPrefix . $this->getIRCLine();
 189                                 socket_sendto( $conn, $line, strlen($line), 0, $wgRC2UDPAddress, $wgRC2UDPPort );
 190                                 socket_close( $conn );
 191                         }
 192                 }
 193
 194                 # E-mail notifications
 195                 global $wgUseEnotif;
 196                 if( $wgUseEnotif ) {
 197                         # this would be better as an extension hook
 198                         include_once( "UserMailer.php" );
 199                         $enotif = new EmailNotification();
 200                         $title = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
 201                         $enotif->notifyOnPageChange( $title,
 202                                 $this->mAttribs['rc_timestamp'],
 203                                 $this->mAttribs['rc_comment'],
 204                                 $this->mAttribs['rc_minor'],
 205                                 $this->mAttribs['rc_last_oldid'] );
 206                 }
 207
 208                 # Notify extensions
 209                 wfRunHooks( 'RecentChange_save', array( &$this ) );
 210         }
 211
 212         # Marks a certain row as patrolled
 213         function markPatrolled( $rcid )
 214         {
 215                 $fname = 'RecentChange::markPatrolled';
 216
 217                 $dbw = wfGetDB( DB_MASTER );
 218
 219                 $dbw->update( 'recentchanges',
 220                         array( /* SET */
 221                                 'rc_patrolled' => 1
 222                         ), array( /* WHERE */
 223                                 'rc_id' => $rcid
 224                         ), $fname
 225                 );
 226         }
 227
 228         # Makes an entry in the database corresponding to an edit
 229         /*static*/ function notifyEdit( $timestamp, &$title, $minor, &$user, $comment,
 230                 $oldId, $lastTimestamp, $bot = "default", $ip = '', $oldSize = 0, $newSize = 0,
 231                 $newId = 0)
 232         {
 233
 234                 if ( $bot === 'default' ) {
 235                         $bot = $user->isAllowed( 'bot' );
 236                 }
 237
 238                 if ( !$ip ) {
 239                         $ip = wfGetIP();
 240                         if ( !$ip ) {
 241                                 $ip = '';
 242                         }
 243                 }
 244
 245                 $rc = new RecentChange;
 246                 $rc->mAttribs = array(
 247                         'rc_timestamp'  => $timestamp,
 248                         'rc_cur_time'   => $timestamp,
 249                         'rc_namespace'  => $title->getNamespace(),
 250                         'rc_title'      => $title->getDBkey(),
 251                         'rc_type'       => RC_EDIT,
 252                         'rc_minor'      => $minor ? 1 : 0,
 253                         'rc_cur_id'     => $title->getArticleID(),
 254                         'rc_user'       => $user->getID(),
 255                         'rc_user_text'  => $user->getName(),
 256                         'rc_comment'    => $comment,
 257                         'rc_this_oldid' => $newId,
 258                         'rc_last_oldid' => $oldId,
 259                         'rc_bot'        => $bot ? 1 : 0,
 260                         'rc_moved_to_ns'        => 0,
 261                         'rc_moved_to_title'     => '',
 262                         'rc_ip'         => $ip,
 263                         'rc_patrolled'  => 0,
 264                         'rc_new'        => 0,  # obsolete
 265                         'rc_old_len'    => $oldSize,
 266                         'rc_new_len'    => $newSize
 267                 );
 268
 269                 $rc->mExtra =  array(
 270                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 271                         'lastTimestamp' => $lastTimestamp,
 272                         'oldSize'       => $oldSize,
 273                         'newSize'       => $newSize,
 274                 );
 275                 $rc->save();
 276                 return( $rc->mAttribs['rc_id'] );
 277         }
 278
 279         /**
 280          * Makes an entry in the database corresponding to page creation
 281          * Note: the title object must be loaded with the new id using resetArticleID()
 282          * @todo Document parameters and return
 283          * @public
 284          * @static
 285          */
 286         public static function notifyNew( $timestamp, &$title, $minor, &$user, $comment, $bot = "default",
 287           $ip='', $size = 0, $newId = 0 )
 288         {
 289                 if ( !$ip ) {
 290                         $ip = wfGetIP();
 291                         if ( !$ip ) {
 292                                 $ip = '';
 293                         }
 294                 }
 295                 if ( $bot == 'default' ) {
 296                         $bot = $user->isAllowed( 'bot' );
 297                 }
 298
 299                 $rc = new RecentChange;
 300                 $rc->mAttribs = array(
 301                         'rc_timestamp'      => $timestamp,
 302                         'rc_cur_time'       => $timestamp,
 303                         'rc_namespace'      => $title->getNamespace(),
 304                         'rc_title'          => $title->getDBkey(),
 305                         'rc_type'           => RC_NEW,
 306                         'rc_minor'          => $minor ? 1 : 0,
 307                         'rc_cur_id'         => $title->getArticleID(),
 308                         'rc_user'           => $user->getID(),
 309                         'rc_user_text'      => $user->getName(),
 310                         'rc_comment'        => $comment,
 311                         'rc_this_oldid'     => $newId,
 312                         'rc_last_oldid'     => 0,
 313                         'rc_bot'            => $bot ? 1 : 0,
 314                         'rc_moved_to_ns'    => 0,
 315                         'rc_moved_to_title' => '',
 316                         'rc_ip'             => $ip,
 317                         'rc_patrolled'      => 0,
 318                         'rc_new'            => 1, # obsolete
 319                         'rc_old_len'        => 0,
 320                         'rc_new_len'        => $size
 321                 );
 322
 323                 $rc->mExtra =  array(
 324                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 325                         'lastTimestamp' => 0,
 326                         'oldSize' => 0,
 327                         'newSize' => $size
 328                 );
 329                 $rc->save();
 330                 return( $rc->mAttribs['rc_id'] );
 331         }
 332
 333         # Makes an entry in the database corresponding to a rename
 334         /*static*/ function notifyMove( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='', $overRedir = false )
 335         {
 336                 if ( !$ip ) {
 337                         $ip = wfGetIP();
 338                         if ( !$ip ) {
 339                                 $ip = '';
 340                         }
 341                 }
 342
 343                 $rc = new RecentChange;
 344                 $rc->mAttribs = array(
 345                         'rc_timestamp'  => $timestamp,
 346                         'rc_cur_time'   => $timestamp,
 347                         'rc_namespace'  => $oldTitle->getNamespace(),
 348                         'rc_title'      => $oldTitle->getDBkey(),
 349                         'rc_type'       => $overRedir ? RC_MOVE_OVER_REDIRECT : RC_MOVE,
 350                         'rc_minor'      => 0,
 351                         'rc_cur_id'     => $oldTitle->getArticleID(),
 352                         'rc_user'       => $user->getID(),
 353                         'rc_user_text'  => $user->getName(),
 354                         'rc_comment'    => $comment,
 355                         'rc_this_oldid' => 0,
 356                         'rc_last_oldid' => 0,
 357                         'rc_bot'        => $user->isAllowed( 'bot' ) ? 1 : 0,
 358                         'rc_moved_to_ns'        => $newTitle->getNamespace(),
 359                         'rc_moved_to_title'     => $newTitle->getDBkey(),
 360                         'rc_ip'         => $ip,
 361                         'rc_new'        => 0, # obsolete
 362                         'rc_patrolled'  => 1,
 363                         'rc_old_len'    => NULL,
 364                         'rc_new_len'    => NULL,
 365                 );
 366
 367                 $rc->mExtra = array(
 368                         'prefixedDBkey' => $oldTitle->getPrefixedDBkey(),
 369                         'lastTimestamp' => 0,
 370                         'prefixedMoveTo'        => $newTitle->getPrefixedDBkey()
 371                 );
 372                 $rc->save();
 373         }
 374
 375         /* static */ function notifyMoveToNew( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
 376                 RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, false );
 377         }
 378
 379         /* static */ function notifyMoveOverRedirect( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
 380                 RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, true );
 381         }
 382
 383         # A log entry is different to an edit in that previous revisions are
 384         # not kept
 385         /*static*/ function notifyLog( $timestamp, &$title, &$user, $comment, $ip='',
 386            $type, $action, $target, $logComment, $params )
 387         {
 388                 if ( !$ip ) {
 389                         $ip = wfGetIP();
 390                         if ( !$ip ) {
 391                                 $ip = '';
 392                         }
 393                 }
 394
 395                 $rc = new RecentChange;
 396                 $rc->mAttribs = array(
 397                         'rc_timestamp'  => $timestamp,
 398                         'rc_cur_time'   => $timestamp,
 399                         'rc_namespace'  => $title->getNamespace(),
 400                         'rc_title'      => $title->getDBkey(),
 401                         'rc_type'       => RC_LOG,
 402                         'rc_minor'      => 0,
 403                         'rc_cur_id'     => $title->getArticleID(),
 404                         'rc_user'       => $user->getID(),
 405                         'rc_user_text'  => $user->getName(),
 406                         'rc_comment'    => $comment,
 407                         'rc_this_oldid' => 0,
 408                         'rc_last_oldid' => 0,
 409                         'rc_bot'        => $user->isAllowed( 'bot' ) ? 1 : 0,
 410                         'rc_moved_to_ns'        => 0,
 411                         'rc_moved_to_title'     => '',
 412                         'rc_ip' => $ip,
 413                         'rc_patrolled' => 1,
 414                         'rc_new'        => 0, # obsolete
 415                         'rc_old_len'    => NULL,
 416                         'rc_new_len'    => NULL,
 417                 );
 418                 $rc->mExtra =  array(
 419                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 420                         'lastTimestamp' => 0,
 421                         'logType' => $type,
 422                         'logAction' => $action,
 423                         'logComment' => $logComment,
 424                         'logTarget' => $target,
 425                         'logParams' => $params
 426                 );
 427                 $rc->save();
 428         }
 429
 430         # Initialises the members of this object from a mysql row object
 431         function loadFromRow( $row )
 432         {
 433                 $this->mAttribs = get_object_vars( $row );
 434                 $this->mAttribs["rc_timestamp"] = wfTimestamp(TS_MW, $this->mAttribs["rc_timestamp"]);
 435                 $this->mExtra = array();
 436         }
 437
 438         # Makes a pseudo-RC entry from a cur row
 439         function loadFromCurRow( $row )
 440         {
 441                 $this->mAttribs = array(
 442                         'rc_timestamp' => wfTimestamp(TS_MW, $row->rev_timestamp),
 443                         'rc_cur_time' => $row->rev_timestamp,
 444                         'rc_user' => $row->rev_user,
 445                         'rc_user_text' => $row->rev_user_text,
 446                         'rc_namespace' => $row->page_namespace,
 447                         'rc_title' => $row->page_title,
 448                         'rc_comment' => $row->rev_comment,
 449                         'rc_minor' => $row->rev_minor_edit ? 1 : 0,
 450                         'rc_type' => $row->page_is_new ? RC_NEW : RC_EDIT,
 451                         'rc_cur_id' => $row->page_id,
 452                         'rc_this_oldid' => $row->rev_id,
 453                         'rc_last_oldid' => isset($row->rc_last_oldid) ? $row->rc_last_oldid : 0,
 454                         'rc_bot'        => 0,
 455                         'rc_moved_to_ns'        => 0,
 456                         'rc_moved_to_title'     => '',
 457                         'rc_ip' => '',
 458                         'rc_id' => $row->rc_id,
 459                         'rc_patrolled' => $row->rc_patrolled,
 460                         'rc_new' => $row->page_is_new, # obsolete
 461                         'rc_old_len' => $row->rc_old_len,
 462                         'rc_new_len' => $row->rc_new_len,
 463                 );
 464
 465                 $this->mExtra = array();
 466         }
 467
 468         /**
 469          * Get an attribute value
 470          *
 471          * @param $name Attribute name
 472          * @return mixed
 473          */
 474         public function getAttribute( $name ) {
 475                 return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : NULL;
 476         }
 477
 478         /**
 479          * Gets the end part of the diff URL associated with this object
 480          * Blank if no diff link should be displayed
 481          */
 482         function diffLinkTrail( $forceCur )
 483         {
 484                 if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
 485                         $trail = "curid=" . (int)($this->mAttribs['rc_cur_id']) .
 486                                 "&oldid=" . (int)($this->mAttribs['rc_last_oldid']);
 487                         if ( $forceCur ) {
 488                                 $trail .= '&diff=0' ;
 489                         } else {
 490                                 $trail .= '&diff=' . (int)($this->mAttribs['rc_this_oldid']);
 491                         }
 492                 } else {
 493                         $trail = '';
 494                 }
 495                 return $trail;
 496         }
 497
 498         function cleanupForIRC( $text ) {
 499                 return str_replace(array("\n", "\r"), array("", ""), $text);
 500         }
 501
 502         function getIRCLine() {
 503                 global $wgUseRCPatrol;
 504
 505                 // FIXME: Would be good to replace these 2 extract() calls with something more explicit
 506                 // e.g. list ($rc_type, $rc_id) = array_values ($this->mAttribs); [or something like that]
 507                 extract($this->mAttribs);
 508                 extract($this->mExtra);
 509
 510                 $titleObj =& $this->getTitle();
 511                 if ( $rc_type == RC_LOG ) {
 512                         $title = Namespace::getCanonicalName( $titleObj->getNamespace() ) . $titleObj->getText();
 513                 } else {
 514                         $title = $titleObj->getPrefixedText();
 515                 }
 516                 $title = $this->cleanupForIRC( $title );
 517
 518                 $bad = array("\n", "\r");
 519                 $empty = array("", "");
 520                 $title = $titleObj->getPrefixedText();
 521                 $title = str_replace($bad, $empty, $title);
 522
 523                 // FIXME: *HACK* these should be getFullURL(), hacked for SSL madness --brion 2005-12-26
 524                 if ( $rc_type == RC_LOG ) {
 525                         $url = '';
 526                 } elseif ( $rc_new && $wgUseRCPatrol ) {
 527                         $url = $titleObj->getInternalURL("rcid=$rc_id");
 528                 } else if ( $rc_new ) {
 529                         $url = $titleObj->getInternalURL();
 530                 } else if ( $wgUseRCPatrol ) {
 531                         $url = $titleObj->getInternalURL("diff=$rc_this_oldid&oldid=$rc_last_oldid&rcid=$rc_id");
 532                 } else {
 533                         $url = $titleObj->getInternalURL("diff=$rc_this_oldid&oldid=$rc_last_oldid");
 534                 }
 535
 536                 if ( isset( $oldSize ) && isset( $newSize ) ) {
 537                         $szdiff = $newSize - $oldSize;
 538                         if ($szdiff < -500) {
 539                                 $szdiff = "\002$szdiff\002";
 540                         } elseif ($szdiff >= 0) {
 541                                 $szdiff = '+' . $szdiff ;
 542                         }
 543                         $szdiff = '(' . $szdiff . ')' ;
 544                 } else {
 545                         $szdiff = '';
 546                 }
 547
 548                 $user = $this->cleanupForIRC( $rc_user_text );
 549
 550                 if ( $rc_type == RC_LOG ) {
 551                         $logTargetText = $logTarget->getPrefixedText();
 552                         $comment = $this->cleanupForIRC( str_replace( $logTargetText, "\00302$logTargetText\00310", $rc_comment ) );
 553                         $flag = $logAction;
 554                 } else {
 555                         $comment = $this->cleanupForIRC( $rc_comment );
 556                         $flag = ($rc_minor ? "M" : "") . ($rc_new ? "N" : "");
 557                 }
 558                 # see http://www.irssi.org/documentation/formats for some colour codes. prefix is \003,
 559                 # no colour (\003) switches back to the term default
 560                 $fullString = "\00314[[\00307$title\00314]]\0034 $flag\00310 " .
 561                               "\00302$url\003 \0035*\003 \00303$user\003 \0035*\003 $szdiff \00310$comment\003\n";
 562                 return $fullString;
 563         }
 564
 565         /**
 566          * Returns the change size (HTML).
 567          * The lengths can be given optionally.
 568          */
 569         function getCharacterDifference( $old = 0, $new = 0 ) {
 570                 global $wgRCChangedSizeThreshold, $wgLang;
 571
 572                 if( $old === 0 ) {
 573                         $old = $this->mAttribs['rc_old_len'];
 574                 }
 575                 if( $new === 0 ) {
 576                         $new = $this->mAttribs['rc_new_len'];
 577                 }
 578
 579                 if( $old === NULL || $new === NULL ) {
 580                         return '';
 581                 }
 582
 583                 $szdiff = $new - $old;
 584                 $formatedSize = wfMsgExt( 'rc-change-size', array( 'parsemag', 'escape'),
 585                         $wgLang->formatNum($szdiff) );
 586
 587                 if( $szdiff < $wgRCChangedSizeThreshold ) {
 588                         return '<strong class=\'mw-plusminus-neg\'>(' . $formatedSize . ')</strong>';
 589                 } elseif( $szdiff === 0 ) {
 590                         return '<span class=\'mw-plusminus-null\'>(' . $formatedSize . ')</span>';
 591                 } elseif( $szdiff > 0 ) {
 592                         return '<span class=\'mw-plusminus-pos\'>(+' . $formatedSize . ')</span>';
 593                 } else {
 594                         return '<span class=\'mw-plusminus-neg\'>(' . $formatedSize . ')</span>';
 595                 }
 596         }
 597 }
 598 ?>