includes/ChangesList.php

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