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