includes/ChangesList.php

   1 <?php
   2
   3 /**
   4  * @todo document
   5  */
   6 class RCCacheEntry extends RecentChange {
   7         var $secureName, $link;
   8         var $curlink , $difflink, $lastlink, $usertalklink, $versionlink;
   9         var $userlink, $timestamp, $watched;
  10
  11         static function newFromParent( $rc ) {
  12                 $rc2 = new RCCacheEntry;
  13                 $rc2->mAttribs = $rc->mAttribs;
  14                 $rc2->mExtra = $rc->mExtra;
  15                 return $rc2;
  16         }
  17 }
  18
  19 /**
  20  * Class to show various lists of changes:
  21  * - what links here
  22  * - related changes
  23  * - recent changes
  24  */
  25 class ChangesList {
  26         # Called by history lists and recent changes
  27
  28         /**
  29         * Changeslist contructor
  30         * @param Skin $skin
  31         */
  32         public function __construct( &$skin ) {
  33                 $this->skin =& $skin;
  34                 $this->preCacheMessages();
  35         }
  36
  37         /**
  38          * Fetch an appropriate changes list class for the specified user
  39          * Some users might want to use an enhanced list format, for instance
  40          *
  41          * @param $user User to fetch the list class for
  42          * @return ChangesList derivative
  43          */
  44         public static function newFromUser( &$user ) {
  45                 $sk = $user->getSkin();
  46                 $list = NULL;
  47                 if( wfRunHooks( 'FetchChangesList', array( &$user, &$sk, &$list ) ) ) {
  48                         return $user->getOption( 'usenewrc' ) ? new EnhancedChangesList( $sk ) : new OldChangesList( $sk );
  49                 } else {
  50                         return $list;
  51                 }
  52         }
  53
  54         /**
  55          * As we use the same small set of messages in various methods and that
  56          * they are called often, we call them once and save them in $this->message
  57          */
  58         private function preCacheMessages() {
  59                 if( !isset( $this->message ) ) {
  60                         foreach( explode(' ', 'cur diff hist minoreditletter newpageletter last '.
  61                                 'blocklink history boteditletter semicolon-separator' ) as $msg ) {
  62                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
  63                         }
  64                 }
  65         }
  66
  67
  68         /**
  69          * Returns the appropriate flags for new page, minor change and patrolling
  70          * @param bool $new
  71          * @param bool $minor
  72          * @param bool $patrolled
  73          * @param string $nothing, string to use for empty space
  74          * @param bool $bot
  75          * @return string
  76          */
  77         protected function recentChangesFlags( $new, $minor, $patrolled, $nothing = '&nbsp;', $bot = false ) {
  78                 $f = $new ?
  79                         '<span class="newpage">' . $this->message['newpageletter'] . '</span>' : $nothing;
  80                 $f .= $minor ?
  81                         '<span class="minor">' . $this->message['minoreditletter'] . '</span>' : $nothing;
  82                 $f .= $bot ? '<span class="bot">' . $this->message['boteditletter'] . '</span>' : $nothing;
  83                 $f .= $patrolled ? '<span class="unpatrolled">!</span>' : $nothing;
  84                 return $f;
  85         }
  86
  87         /**
  88          * Returns text for the start of the tabular part of RC
  89          * @return string
  90          */
  91         public function beginRecentChangesList() {
  92                 $this->rc_cache = array();
  93                 $this->rcMoveIndex = 0;
  94                 $this->rcCacheIndex = 0;
  95                 $this->lastdate = '';
  96                 $this->rclistOpen = false;
  97                 return '';
  98         }
  99
 100         /**
 101          * Show formatted char difference
 102          * @param int $old bytes
 103          * @param int $new bytes
 104          * @returns string
 105          */
 106         public static function showCharacterDifference( $old, $new ) {
 107                 global $wgRCChangedSizeThreshold, $wgLang;
 108                 $szdiff = $new - $old;
 109                 $formatedSize = wfMsgExt( 'rc-change-size', array( 'parsemag', 'escape'), $wgLang->formatNum($szdiff) );
 110                 if( abs( $szdiff ) > abs( $wgRCChangedSizeThreshold ) ) {
 111                         $tag = 'strong';
 112                 } else {
 113                     $tag = 'span';
 114                 }
 115                 if( $szdiff === 0 ) {
 116                         return "<$tag class='mw-plusminus-null'>($formatedSize)</$tag>";
 117                 } elseif( $szdiff > 0 ) {
 118                         return "<$tag class='mw-plusminus-pos'>(+$formatedSize)</$tag>";
 119             } else {
 120                         return "<$tag class='mw-plusminus-neg'>($formatedSize)</$tag>";
 121                 }
 122         }
 123
 124         /**
 125          * Returns text for the end of RC
 126          * @return string
 127          */
 128         public function endRecentChangesList() {
 129                 if( $this->rclistOpen ) {
 130                         return "</ul>\n";
 131                 } else {
 132                         return '';
 133                 }
 134         }
 135
 136         protected function insertMove( &$s, $rc ) {
 137                 # Diff
 138                 $s .= '(' . $this->message['diff'] . ') (';
 139                 # Hist
 140                 $s .= $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), $this->message['hist'], 'action=history' ) .
 141                         ') . . ';
 142                 # "[[x]] moved to [[y]]"
 143                 $msg = ( $rc->mAttribs['rc_type'] == RC_MOVE ) ? '1movedto2' : '1movedto2_redir';
 144                 $s .= wfMsg( $msg, $this->skin->makeKnownLinkObj( $rc->getTitle(), '', 'redirect=no' ),
 145                         $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), '' ) );
 146         }
 147
 148         protected function insertDateHeader( &$s, $rc_timestamp ) {
 149                 global $wgLang;
 150
 151                 # Make date header if necessary
 152                 $date = $wgLang->date( $rc_timestamp, true, true );
 153                 if( $date != $this->lastdate ) {
 154                         if( '' != $this->lastdate ) {
 155                                 $s .= "</ul>\n";
 156                         }
 157                         $s .= '<h4>'.$date."</h4>\n<ul class=\"special\">";
 158                         $this->lastdate = $date;
 159                         $this->rclistOpen = true;
 160                 }
 161         }
 162
 163         protected function insertLog( &$s, $title, $logtype ) {
 164                 $logname = LogPage::logName( $logtype );
 165                 $s .= '(' . $this->skin->makeKnownLinkObj($title, $logname ) . ')';
 166         }
 167
 168         protected function insertDiffHist( &$s, &$rc, $unpatrolled ) {
 169                 # Diff link
 170                 if( !$this->userCan($rc,Revision::DELETED_TEXT) ) {
 171                         $diffLink = $this->message['diff'];
 172                 } else if( $rc->mAttribs['rc_type'] == RC_NEW || $rc->mAttribs['rc_type'] == RC_LOG ) {
 173                         $diffLink = $this->message['diff'];
 174                 } else {
 175                         $rcidparam = $unpatrolled ?
 176                                 array( 'rcid' => $rc->mAttribs['rc_id'] ) : array();
 177                         $diffLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['diff'],
 178                                 wfArrayToCGI( array(
 179                                         'curid' => $rc->mAttribs['rc_cur_id'],
 180                                         'diff'  => $rc->mAttribs['rc_this_oldid'],
 181                                         'oldid' => $rc->mAttribs['rc_last_oldid'] ),
 182                                         $rcidparam ),
 183                                 '', '', ' tabindex="'.$rc->counter.'"');
 184                 }
 185                 $s .= '('.$diffLink.') (';
 186                 # History link
 187                 $s .= $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['hist'],
 188                         wfArrayToCGI( array(
 189                                 'curid' => $rc->mAttribs['rc_cur_id'],
 190                                 'action' => 'history' ) ) );
 191                 $s .= ') . . ';
 192         }
 193
 194         protected function insertArticleLink( &$s, &$rc, $unpatrolled, $watched ) {
 195                 global $wgContLang;
 196                 # If it's a new article, there is no diff link, but if it hasn't been
 197                 # patrolled yet, we need to give users a way to do so
 198                 $params = ( $unpatrolled && $rc->mAttribs['rc_type'] == RC_NEW ) ?
 199                         'rcid='.$rc->mAttribs['rc_id'] : '';
 200                 if( $this->isDeleted($rc,Revision::DELETED_TEXT) ) {
 201                         $articlelink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '', $params );
 202                         $articlelink = '<span class="history-deleted">'.$articlelink.'</span>';
 203                 } else {
 204                     $articlelink = ' '. $this->skin->makeKnownLinkObj( $rc->getTitle(), '', $params );
 205                 }
 206                 # Bolden pages watched by this user
 207                 if( $watched ) {
 208                         $articlelink = "<strong class=\"mw-watched\">{$articlelink}</strong>";
 209                 }
 210                 # RTL/LTR marker
 211                 $articlelink .= $wgContLang->getDirMark();
 212
 213                 wfRunHooks('ChangesListInsertArticleLink',
 214                         array(&$this, &$articlelink, &$s, &$rc, $unpatrolled, $watched));
 215
 216                 $s .= " $articlelink";
 217         }
 218
 219         protected function insertTimestamp( &$s, $rc ) {
 220                 global $wgLang;
 221                 # Timestamp
 222                 $s .= $this->message['semicolon-separator'] . $wgLang->time( $rc->mAttribs['rc_timestamp'], true, true ) . ' . . ';
 223         }
 224
 225         /** Insert links to user page, user talk page and eventually a blocking link */
 226         public function insertUserRelatedLinks(&$s, &$rc) {
 227                 if ( $this->isDeleted($rc,Revision::DELETED_USER) ) {
 228                    $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-user') . '</span>';
 229                 } else {
 230                   $s .= $this->skin->userLink( $rc->mAttribs['rc_user'], $rc->mAttribs['rc_user_text'] );
 231                   $s .= $this->skin->userToolLinks( $rc->mAttribs['rc_user'], $rc->mAttribs['rc_user_text'] );
 232                 }
 233         }
 234
 235         /** insert a formatted action */
 236         protected function insertAction(&$s, &$rc) {
 237                 # Add action
 238                 if( $rc->mAttribs['rc_type'] == RC_LOG ) {
 239                         // log action
 240                         if ( $this->isDeleted($rc,LogPage::DELETED_ACTION) ) {
 241                                 $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 242                         } else {
 243                                 $s .= ' ' . LogPage::actionText( $rc->mAttribs['rc_log_type'], $rc->mAttribs['rc_log_action'],
 244                                         $rc->getTitle(), $this->skin, LogPage::extractParams($rc->mAttribs['rc_params']), true, true );
 245                         }
 246                 }
 247         }
 248
 249         /** insert a formatted comment */
 250         protected function insertComment(&$s, &$rc) {
 251                 # Add comment
 252                 if( $rc->mAttribs['rc_type'] != RC_MOVE && $rc->mAttribs['rc_type'] != RC_MOVE_OVER_REDIRECT ) {
 253                         // log comment
 254                         if ( $this->isDeleted($rc,Revision::DELETED_COMMENT) ) {
 255                                 $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-comment') . '</span>';
 256                         } else {
 257                                 $s .= $this->skin->commentBlock( $rc->mAttribs['rc_comment'], $rc->getTitle() );
 258                         }
 259                 }
 260         }
 261
 262         /**
 263          * Check whether to enable recent changes patrol features
 264          * @return bool
 265          */
 266         public static function usePatrol() {
 267                 global $wgUser;
 268                 return $wgUser->useRCPatrol();
 269         }
 270
 271         /**
 272          * Returns the string which indicates the number of watching users
 273          */
 274         protected function numberofWatchingusers( $count ) {
 275                 global $wgLang;
 276                 static $cache = array();
 277                 if ( $count > 0 ) {
 278                         if ( !isset( $cache[$count] ) ) {
 279                                 $cache[$count] = wfMsgExt('number_of_watching_users_RCview',
 280                                         array('parsemag', 'escape'), $wgLang->formatNum($count));
 281                         }
 282                         return $cache[$count];
 283                 } else {
 284                         return '';
 285                 }
 286         }
 287
 288         /**
 289          * Determine if said field of a revision is hidden
 290          * @param RCCacheEntry $rc
 291          * @param int $field one of DELETED_* bitfield constants
 292          * @return bool
 293          */
 294         public static function isDeleted( $rc, $field ) {
 295                 return ($rc->mAttribs['rc_deleted'] & $field) == $field;
 296         }
 297
 298         /**
 299          * Determine if the current user is allowed to view a particular
 300          * field of this revision, if it's marked as deleted.
 301          * @param RCCacheEntry $rc
 302          * @param int $field
 303          * @return bool
 304          */
 305         public static function userCan( $rc, $field ) {
 306                 if( ( $rc->mAttribs['rc_deleted'] & $field ) == $field ) {
 307                         global $wgUser;
 308                         $permission = ( $rc->mAttribs['rc_deleted'] & Revision::DELETED_RESTRICTED ) == Revision::DELETED_RESTRICTED
 309                                 ? 'suppressrevision'
 310                                 : 'deleterevision';
 311                         wfDebug( "Checking for $permission due to $field match on $rc->mAttribs['rc_deleted']\n" );
 312                         return $wgUser->isAllowed( $permission );
 313                 } else {
 314                         return true;
 315                 }
 316         }
 317
 318         protected function maybeWatchedLink( $link, $watched=false ) {
 319                 if( $watched ) {
 320                         // FIXME: css style might be more appropriate
 321                         return '<strong class="mw-watched">' . $link . '</strong>';
 322                 } else {
 323                         return '<span class="mw-rc-unwatched">' . $link . '</span>';
 324                 }
 325         }
 326 }
 327
 328
 329 /**
 330  * Generate a list of changes using the good old system (no javascript)
 331  */
 332 class OldChangesList extends ChangesList {
 333         /**
 334          * Format a line using the old system (aka without any javascript).
 335          */
 336         public function recentChangesLine( &$rc, $watched = false ) {
 337                 global $wgContLang, $wgRCShowChangedSize, $wgUser;
 338
 339                 $fname = 'ChangesList::recentChangesLineOld';
 340                 wfProfileIn( $fname );
 341
 342                 # Extract DB fields into local scope
 343                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 344                 extract( $rc->mAttribs );
 345
 346                 # Should patrol-related stuff be shown?
 347                 $unpatrolled = $wgUser->useRCPatrol() && $rc_patrolled == 0;
 348
 349                 $dateheader = ""; // $s now contains only <li>...</li>, for hooks' convenience.
 350                 $this->insertDateHeader($dateheader,$rc_timestamp);
 351
 352                 $s = '';
 353
 354                 // Moved pages
 355                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 356                         $this->insertMove( $s, $rc );
 357                 // Log entries
 358                 } elseif( $rc_log_type ) {
 359                         $logtitle = Title::newFromText( "Log/$rc_log_type", NS_SPECIAL );
 360                         $this->insertLog( $s, $logtitle, $rc_log_type );
 361                 // Log entries (old format) or log targets, and special pages
 362                 } elseif( $rc_namespace == NS_SPECIAL ) {
 363                         list( $specialName, $specialSubpage ) = SpecialPage::resolveAliasWithSubpage( $rc_title );
 364                         if ( $specialName == 'Log' ) {
 365                                 $this->insertLog( $s, $rc->getTitle(), $specialSubpage );
 366                         } else {
 367                                 wfDebug( "Unexpected special page in recentchanges\n" );
 368                         }
 369                 // Regular entries
 370                 } else {
 371                         wfProfileIn($fname.'-page');
 372
 373                         $this->insertDiffHist($s, $rc, $unpatrolled);
 374
 375                         # M, N, b and ! (minor, new, bot and unpatrolled)
 376                         $s .= $this->recentChangesFlags( $rc_type == RC_NEW, $rc_minor, $unpatrolled, '', $rc_bot );
 377                         $this->insertArticleLink($s, $rc, $unpatrolled, $watched);
 378
 379                         wfProfileOut($fname.'-page');
 380                 }
 381
 382                 wfProfileIn( $fname.'-rest' );
 383
 384                 $this->insertTimestamp($s,$rc);
 385
 386                 if( $wgRCShowChangedSize ) {
 387                         $s .= ( $rc->getCharacterDifference() == '' ? '' : $rc->getCharacterDifference() . ' . . ' );
 388                 }
 389                 # User tool links
 390                 $this->insertUserRelatedLinks($s,$rc);
 391                 # Log action text (if any)
 392                 $this->insertAction($s, $rc);
 393                 # Edit or log comment
 394                 $this->insertComment($s, $rc);
 395
 396                 # Mark revision as deleted if so
 397                 if ( !$rc_log_type && $this->isDeleted($rc,Revision::DELETED_TEXT) )
 398                    $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 399                 if($rc->numberofWatchingusers > 0) {
 400                         $s .= ' ' . wfMsg('number_of_watching_users_RCview',  $wgContLang->formatNum($rc->numberofWatchingusers));
 401                 }
 402
 403                 wfRunHooks( 'OldChangesListRecentChangesLine', array(&$this, &$s, $rc) );
 404
 405                 $s = "<li>$s</li>\n";
 406
 407                 wfProfileOut( $fname.'-rest' );
 408
 409                 wfProfileOut( $fname );
 410                 return $dateheader . $s;
 411         }
 412 }
 413
 414
 415 /**
 416  * Generate a list of changes using an Enhanced system (use javascript).
 417  */
 418 class EnhancedChangesList extends ChangesList {
 419
 420         /**
 421         *  Add the JavaScript file for enhanced changeslist
 422         *  @ return string
 423         */
 424         public function beginRecentChangesList() {
 425                 global $wgStylePath, $wgJsMimeType, $wgStyleVersion;
 426                 $this->rc_cache = array();
 427                 $this->rcMoveIndex = 0;
 428                 $this->rcCacheIndex = 0;
 429                 $this->lastdate = '';
 430                 $this->rclistOpen = false;
 431                 $script = Xml::tags( 'script', array(
 432                         'type' => $wgJsMimeType,
 433                         'src' => $wgStylePath . "/common/enhancedchanges.js?$wgStyleVersion" ), '' );
 434                 return $script;
 435         }
 436         /**
 437          * Format a line for enhanced recentchange (aka with javascript and block of lines).
 438          */
 439         public function recentChangesLine( &$baseRC, $watched = false ) {
 440                 global $wgLang, $wgContLang, $wgUser;
 441
 442                 # Create a specialised object
 443                 $rc = RCCacheEntry::newFromParent( $baseRC );
 444
 445                 # Extract fields from DB into the function scope (rc_xxxx variables)
 446                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 447                 extract( $rc->mAttribs );
 448                 $curIdEq = 'curid=' . $rc_cur_id;
 449
 450                 # If it's a new day, add the headline and flush the cache
 451                 $date = $wgLang->date( $rc_timestamp, true);
 452                 $ret = '';
 453                 if( $date != $this->lastdate ) {
 454                         # Process current cache
 455                         $ret = $this->recentChangesBlock();
 456                         $this->rc_cache = array();
 457                         $ret .= "<h4>{$date}</h4>\n";
 458                         $this->lastdate = $date;
 459                 }
 460
 461                 # Should patrol-related stuff be shown?
 462                 if( $wgUser->useRCPatrol() ) {
 463                         $rc->unpatrolled = !$rc_patrolled;
 464                 } else {
 465                         $rc->unpatrolled = false;
 466                 }
 467
 468                 $showdifflinks = true;
 469                 # Make article link
 470                 // Page moves
 471                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 472                         $msg = ( $rc_type == RC_MOVE ) ? "1movedto2" : "1movedto2_redir";
 473                         $clink = wfMsg( $msg, $this->skin->makeKnownLinkObj( $rc->getTitle(), '', 'redirect=no' ),
 474                           $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), '' ) );
 475                 // Log entries (old format) and special pages
 476                 } elseif( $rc_namespace == NS_SPECIAL ) {
 477                         list( $specialName, $logtype ) = SpecialPage::resolveAliasWithSubpage( $rc_title );
 478                         if ( $specialName == 'Log' ) {
 479                                 # Log updates, etc
 480                                 $logname = LogPage::logName( $logtype );
 481                                 $clink = '(' . $this->skin->makeKnownLinkObj( $rc->getTitle(), $logname ) . ')';
 482                         } else {
 483                                 wfDebug( "Unexpected special page in recentchanges\n" );
 484                                 $clink = '';
 485                         }
 486                 // New unpatrolled pages
 487                 } else if( $rc->unpatrolled && $rc_type == RC_NEW ) {
 488                         $clink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '', "rcid={$rc_id}" );
 489                 // Log entries
 490                 } else if( $rc_type == RC_LOG ) {
 491                         if( $rc_log_type ) {
 492                                 $logtitle = SpecialPage::getTitleFor( 'Log', $rc_log_type );
 493                                 $clink = '(' . $this->skin->makeKnownLinkObj( $logtitle, LogPage::logName($rc_log_type) ) . ')';
 494                         } else {
 495                                 $clink = $this->skin->makeLinkObj( $rc->getTitle(), '' );
 496                         }
 497                         $watched = false;
 498                 // Edits
 499                 } else {
 500                         $clink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '' );
 501                 }
 502
 503                 # Don't show unusable diff links
 504                 if ( !ChangesList::userCan($rc,Revision::DELETED_TEXT) ) {
 505                         $showdifflinks = false;
 506                 }
 507
 508                 $time = $wgContLang->time( $rc_timestamp, true, true );
 509                 $rc->watched = $watched;
 510                 $rc->link = $clink;
 511                 $rc->timestamp = $time;
 512                 $rc->numberofWatchingusers = $baseRC->numberofWatchingusers;
 513
 514                 # Make "cur" and "diff" links
 515                 if( $rc->unpatrolled ) {
 516                         $rcIdQuery = "&rcid={$rc_id}";
 517                 } else {
 518                         $rcIdQuery = '';
 519                 }
 520                 $querycur = $curIdEq."&diff=0&oldid=$rc_this_oldid";
 521                 $querydiff = $curIdEq."&diff=$rc_this_oldid&oldid=$rc_last_oldid$rcIdQuery";
 522                 $aprops = ' tabindex="'.$baseRC->counter.'"';
 523                 $curLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['cur'], $querycur, '' ,'', $aprops );
 524
 525                 # Make "diff" an "cur" links
 526                 if( !$showdifflinks ) {
 527                    $curLink = $this->message['cur'];
 528                    $diffLink = $this->message['diff'];
 529                 } else if( $rc_type == RC_NEW || $rc_type == RC_LOG || $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 530                         if( $rc_type != RC_NEW ) {
 531                                 $curLink = $this->message['cur'];
 532                         }
 533                         $diffLink = $this->message['diff'];
 534                 } else {
 535                         $diffLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['diff'], $querydiff, '' ,'', $aprops );
 536                 }
 537
 538                 # Make "last" link
 539                 if( !$showdifflinks ) {
 540                     $lastLink = $this->message['last'];
 541                 } else if( $rc_last_oldid == 0 || $rc_type == RC_LOG || $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 542                         $lastLink = $this->message['last'];
 543                 } else {
 544                         $lastLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['last'],
 545                         $curIdEq.'&diff='.$rc_this_oldid.'&oldid='.$rc_last_oldid . $rcIdQuery );
 546                 }
 547
 548                 # Make user links
 549                 if( $this->isDeleted($rc,Revision::DELETED_USER) ) {
 550                         $rc->userlink = ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-user') . '</span>';
 551                 } else {
 552                         $rc->userlink = $this->skin->userLink( $rc_user, $rc_user_text );
 553                         $rc->usertalklink = $this->skin->userToolLinks( $rc_user, $rc_user_text );
 554                 }
 555
 556                 $rc->lastlink = $lastLink;
 557                 $rc->curlink  = $curLink;
 558                 $rc->difflink = $diffLink;
 559
 560                 # Put accumulated information into the cache, for later display
 561                 # Page moves go on their own line
 562                 $title = $rc->getTitle();
 563                 $secureName = $title->getPrefixedDBkey();
 564                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 565                         # Use an @ character to prevent collision with page names
 566                         $this->rc_cache['@@' . ($this->rcMoveIndex++)] = array($rc);
 567                 } else {
 568                         # Logs are grouped by type
 569                         if( $rc_type == RC_LOG ){
 570                                 $secureName = SpecialPage::getTitleFor( 'Log', $rc_log_type )->getPrefixedDBkey();
 571                         }
 572                         if( !isset( $this->rc_cache[$secureName] ) ) {
 573                                 $this->rc_cache[$secureName] = array();
 574                         }
 575                         array_push( $this->rc_cache[$secureName], $rc );
 576                 }
 577                 return $ret;
 578         }
 579
 580         /**
 581          * Enhanced RC group
 582          */
 583         protected function recentChangesBlockGroup( $block ) {
 584                 global $wgLang, $wgContLang, $wgRCShowChangedSize;
 585                 $r = '<table cellpadding="0" cellspacing="0" border="0" style="background: none"><tr>';
 586
 587                 # Collate list of users
 588                 $userlinks = array();
 589                 # Other properties
 590                 $unpatrolled = false;
 591                 $isnew = false;
 592                 $curId = $currentRevision = 0;
 593                 # Some catalyst variables...
 594                 $namehidden = true;
 595                 $alllogs = true;
 596                 foreach( $block as $rcObj ) {
 597                         $oldid = $rcObj->mAttribs['rc_last_oldid'];
 598                         if( $rcObj->mAttribs['rc_new'] ) {
 599                                 $isnew = true;
 600                         }
 601                         // If all log actions to this page were hidden, then don't
 602                         // give the name of the affected page for this block!
 603                         if( !$this->isDeleted( $rcObj, LogPage::DELETED_ACTION ) ) {
 604                                 $namehidden = false;
 605                         }
 606                         $u = $rcObj->userlink;
 607                         if( !isset( $userlinks[$u] ) ) {
 608                                 $userlinks[$u] = 0;
 609                         }
 610                         if( $rcObj->unpatrolled ) {
 611                                 $unpatrolled = true;
 612                         }
 613                         if( $rcObj->mAttribs['rc_type'] != RC_LOG ) {
 614                                 $alllogs = false;
 615                         }
 616                         # Get the latest entry with a page_id and oldid
 617                         # since logs may not have these.
 618                         if( !$curId && $rcObj->mAttribs['rc_cur_id'] ) {
 619                                 $curId = $rcObj->mAttribs['rc_cur_id'];
 620                         }
 621                         if( !$currentRevision && $rcObj->mAttribs['rc_this_oldid'] ) {
 622                                 $currentRevision = $rcObj->mAttribs['rc_this_oldid'];
 623                         }
 624
 625                         $bot = $rcObj->mAttribs['rc_bot'];
 626                         $userlinks[$u]++;
 627                 }
 628
 629                 # Sort the list and convert to text
 630                 krsort( $userlinks );
 631                 asort( $userlinks );
 632                 $users = array();
 633                 foreach( $userlinks as $userlink => $count) {
 634                         $text = $userlink;
 635                         $text .= $wgContLang->getDirMark();
 636                         if( $count > 1 ) {
 637                                 $text .= ' (' . $wgLang->formatNum( $count ) . '×)';
 638                         }
 639                         array_push( $users, $text );
 640                 }
 641
 642                 $users = ' <span class="changedby">[' . implode( $this->message['semicolon-separator'], $users ) . ']</span>';
 643
 644                 # ID for JS visibility toggle
 645                 $jsid = $this->rcCacheIndex;
 646                 # onclick handler to toggle hidden/expanded
 647                 $toggleLink = "onclick='toggleVisibility($jsid); return false'";
 648                 # Title for <a> tags
 649                 $expandTitle = htmlspecialchars( wfMsg('rc-enhanced-expand') );
 650                 $closeTitle = htmlspecialchars( wfMsg('rc-enhanced-hide') );
 651
 652                 $tl  = "<span id='mw-rc-openarrow-$jsid' class='mw-changeslist-expanded' style='visibility:hidden'><a href='#' $toggleLink title='$expandTitle'>" . $this->sideArrow() . "</a></span>";
 653                 $tl .= "<span id='mw-rc-closearrow-$jsid' class='mw-changeslist-hidden' style='display:none'><a href='#' $toggleLink title='$closeTitle'>" . $this->downArrow() . "</a></span>";
 654                 $r .= '<td valign="top" style="white-space: nowrap"><tt>'.$tl.'&nbsp;';
 655
 656                 # Main line
 657                 $r .= $this->recentChangesFlags( $isnew, false, $unpatrolled, '&nbsp;', $bot );
 658
 659                 # Timestamp
 660                 $r .= '&nbsp;'.$block[0]->timestamp.'&nbsp;</tt></td><td>';
 661
 662                 # Article link
 663                 if( $namehidden ) {
 664                         $r .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 665                 } else {
 666                         $r .= $this->maybeWatchedLink( $block[0]->link, $block[0]->watched );
 667                 }
 668
 669                 $r .= $wgContLang->getDirMark();
 670
 671                 $curIdEq = 'curid=' . $curId;
 672                 # Changes message
 673                 $n = count($block);
 674                 static $nchanges = array();
 675                 if ( !isset( $nchanges[$n] ) ) {
 676                         $nchanges[$n] = wfMsgExt( 'nchanges', array( 'parsemag', 'escape' ), $wgLang->formatNum( $n ) );
 677                 }
 678                 # Total change link
 679                 $r .= ' ';
 680                 if( !$alllogs ) {
 681                         $r .= '(';
 682                         if( !ChangesList::userCan($rcObj,Revision::DELETED_TEXT) ) {
 683                                 $r .= $nchanges[$n];
 684                         } else if( $isnew ) {
 685                                 $r .= $nchanges[$n];
 686                         } else {
 687                                 $r .= $this->skin->makeKnownLinkObj( $block[0]->getTitle(),
 688                                         $nchanges[$n], $curIdEq."&diff=$currentRevision&oldid=$oldid" );
 689                         }
 690                 }
 691
 692                 # History
 693                 if( $alllogs ) {
 694                         // don't show history link for logs
 695                 } else if( $namehidden || !$block[0]->getTitle()->exists() ) {
 696                         $r .= $this->message['semicolon-separator'] . $this->message['hist'] . ')';
 697                 } else {
 698                         $r .= $this->message['semicolon-separator'] . $this->skin->makeKnownLinkObj( $block[0]->getTitle(),
 699                                 $this->message['hist'], $curIdEq . '&action=history' ) . ')';
 700                 }
 701                 $r .= ' . . ';
 702
 703                 # Character difference (does not apply if only log items)
 704                 if( $wgRCShowChangedSize && !$alllogs ) {
 705                         $last = 0;
 706                         $first = count($block) - 1;
 707                         # Some events (like logs) have an "empty" size, so we need to skip those...
 708                         while( $last < $first && $block[$last]->mAttribs['rc_new_len'] === NULL ) {
 709                                 $last++;
 710                         }
 711                         while( $first > $last && $block[$first]->mAttribs['rc_old_len'] === NULL ) {
 712                                 $first--;
 713                         }
 714                         # Get net change
 715                         $chardiff = $rcObj->getCharacterDifference( $block[$first]->mAttribs['rc_old_len'],
 716                                 $block[$last]->mAttribs['rc_new_len'] );
 717
 718                         if( $chardiff == '' ) {
 719                                 $r .= ' ';
 720                         } else {
 721                                 $r .= ' ' . $chardiff. ' . . ';
 722                         }
 723                 }
 724
 725                 $r .= $users;
 726                 $r .= $this->numberofWatchingusers($block[0]->numberofWatchingusers);
 727
 728                 $r .= "</td></tr></table>\n";
 729
 730                 # Sub-entries
 731                 $r .= '<div id="mw-rc-subentries-'.$jsid.'" class="mw-changeslist-hidden"><table cellpadding="0" cellspacing="0"  border="0" style="background: none">';
 732                 foreach( $block as $rcObj ) {
 733                         # Get rc_xxxx variables
 734                         // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 735                         extract( $rcObj->mAttribs );
 736
 737                         #$r .= '<tr><td valign="top">'.$this->spacerArrow();
 738                         $r .= '<tr><td valign="top">';
 739                         $r .= '<tt>'.$this->spacerIndent() . $this->spacerIndent();
 740                         $r .= $this->recentChangesFlags( $rc_new, $rc_minor, $rcObj->unpatrolled, '&nbsp;', $rc_bot );
 741                         $r .= '&nbsp;</tt></td><td valign="top">';
 742
 743                         $o = '';
 744                         if( $rc_this_oldid != 0 ) {
 745                                 $o = 'oldid='.$rc_this_oldid;
 746                         }
 747                         # Log timestamp
 748                         if( $rc_type == RC_LOG ) {
 749                                 $link = '<tt>'.$rcObj->timestamp.'</tt> ';
 750                         # Revision link
 751                         } else if( !ChangesList::userCan($rcObj,Revision::DELETED_TEXT) ) {
 752                                 $link = '<span class="history-deleted"><tt>'.$rcObj->timestamp.'</tt></span> ';
 753                         } else {
 754                                 $rcIdEq = ($rcObj->unpatrolled && $rc_type == RC_NEW) ? '&rcid='.$rcObj->mAttribs['rc_id'] : '';
 755
 756                                 $link = '<tt>'.$this->skin->makeKnownLinkObj( $rcObj->getTitle(), $rcObj->timestamp, $curIdEq.'&'.$o.$rcIdEq ).'</tt>';
 757                                 if( $this->isDeleted($rcObj,Revision::DELETED_TEXT) )
 758                                         $link = '<span class="history-deleted">'.$link.'</span> ';
 759                         }
 760                         $r .= $link;
 761
 762                         if ( !$rc_type == RC_LOG || $rc_type == RC_NEW ) {
 763                                 $r .= ' (';
 764                                 $r .= $rcObj->curlink;
 765                                 $r .= $this->message['semicolon-separator'];
 766                                 $r .= $rcObj->lastlink;
 767                                 $r .= ')';
 768                         }
 769                         $r .= ' . . ';
 770
 771                         # Character diff
 772                         if( $wgRCShowChangedSize ) {
 773                                 $r .= ( $rcObj->getCharacterDifference() == '' ? '' : $rcObj->getCharacterDifference() . ' . . ' ) ;
 774                         }
 775                         # User links
 776                         $r .= $rcObj->userlink;
 777                         $r .= $rcObj->usertalklink;
 778                         // log action
 779                         parent::insertAction( $r, $rcObj );
 780                         // log comment
 781                         parent::insertComment( $r, $rcObj );
 782                         # Mark revision as deleted
 783                         if( !$rc_log_type && $this->isDeleted($rcObj,Revision::DELETED_TEXT) ) {
 784                                 $r .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 785                         }
 786
 787                         $r .= "</td></tr>\n";
 788                 }
 789                 $r .= "</table></div>\n";
 790
 791                 $this->rcCacheIndex++;
 792                 return $r;
 793         }
 794
 795         /**
 796          * Generate HTML for an arrow or placeholder graphic
 797          * @param string $dir one of '', 'd', 'l', 'r'
 798          * @param string $alt text
 799          * @param string $title text
 800          * @return string HTML <img> tag
 801          */
 802         protected function arrow( $dir, $alt='', $title='' ) {
 803                 global $wgStylePath;
 804                 $encUrl = htmlspecialchars( $wgStylePath . '/common/images/Arr_' . $dir . '.png' );
 805                 $encAlt = htmlspecialchars( $alt );
 806                 $encTitle = htmlspecialchars( $title );
 807                 return "<img src=\"$encUrl\" width=\"12\" height=\"12\" alt=\"$encAlt\" title=\"$encTitle\" />";
 808         }
 809
 810         /**
 811          * Generate HTML for a right- or left-facing arrow,
 812          * depending on language direction.
 813          * @return string HTML <img> tag
 814          */
 815         protected function sideArrow() {
 816                 global $wgContLang;
 817                 $dir = $wgContLang->isRTL() ? 'l' : 'r';
 818                 return $this->arrow( $dir, '+', wfMsg('rc-enhanced-expand') );
 819         }
 820
 821         /**
 822          * Generate HTML for a down-facing arrow
 823          * depending on language direction.
 824          * @return string HTML <img> tag
 825          */
 826         protected function downArrow() {
 827                 return $this->arrow( 'd', '-', wfMsg('rc-enhanced-hide') );
 828         }
 829
 830         /**
 831          * Generate HTML for a spacer image
 832          * @return string HTML <img> tag
 833          */
 834         protected function spacerArrow() {
 835                 return $this->arrow( '', codepointToUtf8( 0xa0 ) ); // non-breaking space
 836         }
 837
 838         /**
 839          * Add a set of spaces
 840          * @return string HTML <td> tag
 841          */
 842         protected function spacerIndent() {
 843                 return '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
 844         }
 845
 846         /**
 847          * Enhanced RC ungrouped line.
 848          * @return string a HTML formated line (generated using $r)
 849          */
 850         protected function recentChangesBlockLine( $rcObj ) {
 851                 global $wgContLang, $wgRCShowChangedSize;
 852
 853                 # Get rc_xxxx variables
 854                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 855                 extract( $rcObj->mAttribs );
 856                 $curIdEq = 'curid='.$rc_cur_id;
 857
 858                 $r = '<table cellspacing="0" cellpadding="0" border="0" style="background: none"><tr>';
 859
 860                 $r .= '<td valign="top" style="white-space: nowrap"><tt>' . $this->spacerArrow() . '&nbsp;';
 861
 862                 # Flag and Timestamp
 863                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 864                         $r .= '&nbsp;&nbsp;&nbsp;&nbsp;'; // 4 flags -> 4 spaces
 865                 } else {
 866                         $r .= $this->recentChangesFlags( $rc_type == RC_NEW, $rc_minor, $rcObj->unpatrolled, '&nbsp;', $rc_bot );
 867                 }
 868                 $r .= '&nbsp;'.$rcObj->timestamp.'&nbsp;</tt></td><td>';
 869
 870                 # Article or log link
 871                 if( $rc_log_type ) {
 872                         $logtitle = Title::newFromText( "Log/$rc_log_type", NS_SPECIAL );
 873                         $logname = LogPage::logName( $rc_log_type );
 874                         $r .= '(' . $this->skin->makeKnownLinkObj($logtitle, $logname ) . ')';
 875                 } else if( !$this->userCan($rcObj,Revision::DELETED_TEXT) ) {
 876                         $r .= '<span class="history-deleted">' . $rcObj->link . '</span>';
 877                 } else {
 878                         $r .= $this->maybeWatchedLink( $rcObj->link, $rcObj->watched );
 879                 }
 880
 881                 # Diff and hist links
 882                 if ( $rc_type != RC_LOG ) {
 883                    $r .= ' ('. $rcObj->difflink . $this->message['semicolon-separator'];
 884                    $r .= $this->skin->makeKnownLinkObj( $rcObj->getTitle(), wfMsg( 'hist' ), $curIdEq.'&action=history' ) . ')';
 885                 }
 886                 $r .= ' . . ';
 887
 888                 # Character diff
 889                 if( $wgRCShowChangedSize ) {
 890                         $r .= ( $rcObj->getCharacterDifference() == '' ? '' : $rcObj->getCharacterDifference() . ' . . ' ) ;
 891                 }
 892
 893                 # User/talk
 894                 $r .= ' '.$rcObj->userlink . $rcObj->usertalklink;
 895
 896                 # Log action (if any)
 897                 if( $rc_log_type ) {
 898                         if( $this->isDeleted($rcObj,LogPage::DELETED_ACTION) ) {
 899                                 $r .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 900                         } else {
 901                                 $r .= ' ' . LogPage::actionText( $rc_log_type, $rc_log_action, $rcObj->getTitle(),
 902                                         $this->skin, LogPage::extractParams($rc_params), true, true );
 903                         }
 904                 }
 905
 906                 # Edit or log comment
 907                 if( $rc_type != RC_MOVE && $rc_type != RC_MOVE_OVER_REDIRECT ) {
 908                         // log comment
 909                         if ( $this->isDeleted($rcObj,LogPage::DELETED_COMMENT) ) {
 910                            $r .= ' <span class="history-deleted">' . wfMsg('rev-deleted-comment') . '</span>';
 911                         } else {
 912                           $r .= $this->skin->commentBlock( $rc_comment, $rcObj->getTitle() );
 913                         }
 914                 }
 915
 916                 # Show how many people are watching this if enabled
 917                 $r .= $this->numberofWatchingusers($rcObj->numberofWatchingusers);
 918
 919                 $r .= "</td></tr></table>\n";
 920                 return $r;
 921         }
 922
 923         /**
 924          * If enhanced RC is in use, this function takes the previously cached
 925          * RC lines, arranges them, and outputs the HTML
 926          */
 927         protected function recentChangesBlock() {
 928                 if( count ( $this->rc_cache ) == 0 ) {
 929                         return '';
 930                 }
 931                 $blockOut = '';
 932                 foreach( $this->rc_cache as $block ) {
 933                         if( count( $block ) < 2 ) {
 934                                 $blockOut .= $this->recentChangesBlockLine( array_shift( $block ) );
 935                         } else {
 936                                 $blockOut .= $this->recentChangesBlockGroup( $block );
 937                         }
 938                 }
 939
 940                 return '<div>'.$blockOut.'</div>';
 941         }
 942
 943         /**
 944          * Returns text for the end of RC
 945          * If enhanced RC is in use, returns pretty much all the text
 946          */
 947         public function endRecentChangesList() {
 948                 return $this->recentChangesBlock() . parent::endRecentChangesList();
 949         }
 950
 951 }