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          * Show formatted char difference
 105          * @param int $old bytes
 106          * @param int $new bytes
 107          * @returns string
 108          */
 109         public static function showCharacterDifference( $old, $new ) {
 110                 global $wgRCChangedSizeThreshold, $wgLang;
 111                 $szdiff = $new - $old;
 112                 $formatedSize = wfMsgExt( 'rc-change-size', array( 'parsemag', 'escape'), $wgLang->formatNum($szdiff) );
 113                 if( abs( $szdiff ) > abs( $wgRCChangedSizeThreshold ) ) {
 114                         $tag = 'strong';
 115                 } else {
 116                     $tag = 'span';
 117                 }
 118                 if( $szdiff === 0 ) {
 119                         return "<$tag class='mw-plusminus-null'>($formatedSize)</$tag>";
 120                 } elseif( $szdiff > 0 ) {
 121                         return "<$tag class='mw-plusminus-pos'>(+$formatedSize)</$tag>";
 122             } else {
 123                         return "<$tag class='mw-plusminus-neg'>($formatedSize)</$tag>";
 124                 }
 125         }
 126
 127         /**
 128          * Returns text for the end of RC
 129          * @return string
 130          */
 131         public function endRecentChangesList() {
 132                 if( $this->rclistOpen ) {
 133                         return "</ul>\n";
 134                 } else {
 135                         return '';
 136                 }
 137         }
 138
 139         protected function insertMove( &$s, $rc ) {
 140                 # Diff
 141                 $s .= '(' . $this->message['diff'] . ') (';
 142                 # Hist
 143                 $s .= $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), $this->message['hist'], 'action=history' ) .
 144                         ') . . ';
 145
 146                 # "[[x]] moved to [[y]]"
 147                 $msg = ( $rc->mAttribs['rc_type'] == RC_MOVE ) ? '1movedto2' : '1movedto2_redir';
 148                 $s .= wfMsg( $msg, $this->skin->makeKnownLinkObj( $rc->getTitle(), '', 'redirect=no' ),
 149                         $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), '' ) );
 150         }
 151
 152         protected function insertDateHeader(&$s, $rc_timestamp) {
 153                 global $wgLang;
 154
 155                 # Make date header if necessary
 156                 $date = $wgLang->date( $rc_timestamp, true, true );
 157                 if( $date != $this->lastdate ) {
 158                         if( '' != $this->lastdate ) {
 159                                 $s .= "</ul>\n";
 160                         }
 161                         $s .= '<h4>'.$date."</h4>\n<ul class=\"special\">";
 162                         $this->lastdate = $date;
 163                         $this->rclistOpen = true;
 164                 }
 165         }
 166
 167         protected function insertLog(&$s, $title, $logtype) {
 168                 $logname = LogPage::logName( $logtype );
 169                 $s .= '(' . $this->skin->makeKnownLinkObj($title, $logname ) . ')';
 170         }
 171
 172         protected function insertDiffHist(&$s, &$rc, $unpatrolled) {
 173                 # Diff link
 174                 if( !$this->userCan($rc,Revision::DELETED_TEXT) ) {
 175                         $diffLink = $this->message['diff'];
 176                 } else if( $rc->mAttribs['rc_type'] == RC_NEW || $rc->mAttribs['rc_type'] == RC_LOG ) {
 177                         $diffLink = $this->message['diff'];
 178                 } else {
 179                         $rcidparam = $unpatrolled
 180                                 ? array( 'rcid' => $rc->mAttribs['rc_id'] )
 181                                 : array();
 182                         $diffLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['diff'],
 183                                 wfArrayToCGI( array(
 184                                         'curid' => $rc->mAttribs['rc_cur_id'],
 185                                         'diff'  => $rc->mAttribs['rc_this_oldid'],
 186                                         'oldid' => $rc->mAttribs['rc_last_oldid'] ),
 187                                         $rcidparam ),
 188                                 '', '', ' tabindex="'.$rc->counter.'"');
 189                 }
 190                 $s .= '('.$diffLink.') (';
 191
 192                 # History link
 193                 $s .= $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['hist'],
 194                         wfArrayToCGI( array(
 195                                 'curid' => $rc->mAttribs['rc_cur_id'],
 196                                 'action' => 'history' ) ) );
 197                 $s .= ') . . ';
 198         }
 199
 200         protected function insertArticleLink(&$s, &$rc, $unpatrolled, $watched) {
 201                 # Article link
 202                 # If it's a new article, there is no diff link, but if it hasn't been
 203                 # patrolled yet, we need to give users a way to do so
 204                 $params = ( $unpatrolled && $rc->mAttribs['rc_type'] == RC_NEW )
 205                         ? 'rcid='.$rc->mAttribs['rc_id']
 206                         : '';
 207                 if( $this->isDeleted($rc,Revision::DELETED_TEXT) ) {
 208                         $articlelink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '', $params );
 209                         $articlelink = '<span class="history-deleted">'.$articlelink.'</span>';
 210                 } else {
 211                     $articlelink = ' '. $this->skin->makeKnownLinkObj( $rc->getTitle(), '', $params );
 212                 }
 213                 if( $watched )
 214                         $articlelink = "<strong class=\"mw-watched\">{$articlelink}</strong>";
 215                 global $wgContLang;
 216                 $articlelink .= $wgContLang->getDirMark();
 217
 218                 wfRunHooks('ChangesListInsertArticleLink',
 219                         array(&$this, &$articlelink, &$s, &$rc, $unpatrolled, $watched));
 220
 221                 $s .= ' '.$articlelink;
 222         }
 223
 224         protected function insertTimestamp(&$s, $rc) {
 225                 global $wgLang;
 226                 # Timestamp
 227                 $s .= $this->message['semicolon-separator'] . $wgLang->time( $rc->mAttribs['rc_timestamp'], true, true ) . ' . . ';
 228         }
 229
 230         /** Insert links to user page, user talk page and eventually a blocking link */
 231         public function insertUserRelatedLinks(&$s, &$rc) {
 232                 if ( $this->isDeleted($rc,Revision::DELETED_USER) ) {
 233                    $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-user') . '</span>';
 234                 } else {
 235                   $s .= $this->skin->userLink( $rc->mAttribs['rc_user'], $rc->mAttribs['rc_user_text'] );
 236                   $s .= $this->skin->userToolLinks( $rc->mAttribs['rc_user'], $rc->mAttribs['rc_user_text'] );
 237                 }
 238         }
 239
 240         /** insert a formatted action */
 241         protected function insertAction(&$s, &$rc) {
 242                 # Add action
 243                 if( $rc->mAttribs['rc_type'] == RC_LOG ) {
 244                         // log action
 245                         if ( $this->isDeleted($rc,LogPage::DELETED_ACTION) ) {
 246                                 $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 247                         } else {
 248                                 $s .= ' ' . LogPage::actionText( $rc->mAttribs['rc_log_type'], $rc->mAttribs['rc_log_action'],
 249                                         $rc->getTitle(), $this->skin, LogPage::extractParams($rc->mAttribs['rc_params']), true, true );
 250                         }
 251                 }
 252         }
 253
 254         /** insert a formatted comment */
 255         protected function insertComment(&$s, &$rc) {
 256                 # Add comment
 257                 if( $rc->mAttribs['rc_type'] != RC_MOVE && $rc->mAttribs['rc_type'] != RC_MOVE_OVER_REDIRECT ) {
 258                         // log comment
 259                         if ( $this->isDeleted($rc,Revision::DELETED_COMMENT) ) {
 260                                 $s .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-comment') . '</span>';
 261                         } else {
 262                                 $s .= $this->skin->commentBlock( $rc->mAttribs['rc_comment'], $rc->getTitle() );
 263                         }
 264                 }
 265         }
 266
 267         /**
 268          * Check whether to enable recent changes patrol features
 269          * @return bool
 270          */
 271         public static function usePatrol() {
 272                 global $wgUser;
 273                 return $wgUser->useRCPatrol();
 274         }
 275
 276         /**
 277          * Returns the string which indicates the number of watching users
 278          */
 279         protected function numberofWatchingusers( $count ) {
 280                 global $wgLang;
 281                 static $cache = array();
 282                 if ( $count > 0 ) {
 283                         if ( !isset( $cache[$count] ) ) {
 284                                 $cache[$count] = wfMsgExt('number_of_watching_users_RCview',
 285                                         array('parsemag', 'escape'), $wgLang->formatNum($count));
 286                         }
 287                         return $cache[$count];
 288                 } else {
 289                         return '';
 290                 }
 291         }
 292
 293         /**
 294          * Determine if said field of a revision is hidden
 295          * @param RCCacheEntry $rc
 296          * @param int $field one of DELETED_* bitfield constants
 297          * @return bool
 298          */
 299         public static function isDeleted( $rc, $field ) {
 300                 return ($rc->mAttribs['rc_deleted'] & $field) == $field;
 301         }
 302
 303         /**
 304          * Determine if the current user is allowed to view a particular
 305          * field of this revision, if it's marked as deleted.
 306          * @param RCCacheEntry $rc
 307          * @param int $field
 308          * @return bool
 309          */
 310         public static function userCan( $rc, $field ) {
 311                 if( ( $rc->mAttribs['rc_deleted'] & $field ) == $field ) {
 312                         global $wgUser;
 313                         $permission = ( $rc->mAttribs['rc_deleted'] & Revision::DELETED_RESTRICTED ) == Revision::DELETED_RESTRICTED
 314                                 ? 'suppressrevision'
 315                                 : 'deleterevision';
 316                         wfDebug( "Checking for $permission due to $field match on $rc->mAttribs['rc_deleted']\n" );
 317                         return $wgUser->isAllowed( $permission );
 318                 } else {
 319                         return true;
 320                 }
 321         }
 322
 323         protected function maybeWatchedLink( $link, $watched=false ) {
 324                 if( $watched ) {
 325                         // FIXME: css style might be more appropriate
 326                         return '<strong class="mw-watched">' . $link . '</strong>';
 327                 } else {
 328                         return '<span class="mw-rc-unwatched">' . $link . '</span>';
 329                 }
 330         }
 331 }
 332
 333
 334 /**
 335  * Generate a list of changes using the good old system (no javascript)
 336  */
 337 class OldChangesList extends ChangesList {
 338         /**
 339          * Format a line using the old system (aka without any javascript).
 340          */
 341         public function recentChangesLine( &$rc, $watched = false ) {
 342                 global $wgContLang, $wgRCShowChangedSize, $wgUser;
 343
 344                 $fname = 'ChangesList::recentChangesLineOld';
 345                 wfProfileIn( $fname );
 346
 347                 # Extract DB fields into local scope
 348                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 349                 extract( $rc->mAttribs );
 350
 351                 # Should patrol-related stuff be shown?
 352                 $unpatrolled = $wgUser->useRCPatrol() && $rc_patrolled == 0;
 353
 354                 $dateheader = ""; // $s now contains only <li>...</li>, for hooks' convenience.
 355                 $this->insertDateHeader($dateheader,$rc_timestamp);
 356
 357                 $s = '';
 358
 359                 // Moved pages
 360                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 361                         $this->insertMove( $s, $rc );
 362                 // Log entries
 363                 } elseif( $rc_log_type ) {
 364                         $logtitle = Title::newFromText( "Log/$rc_log_type", NS_SPECIAL );
 365                         $this->insertLog( $s, $logtitle, $rc_log_type );
 366                 // Log entries (old format) or log targets, and special pages
 367                 } elseif( $rc_namespace == NS_SPECIAL ) {
 368                         list( $specialName, $specialSubpage ) = SpecialPage::resolveAliasWithSubpage( $rc_title );
 369                         if ( $specialName == 'Log' ) {
 370                                 $this->insertLog( $s, $rc->getTitle(), $specialSubpage );
 371                         } else {
 372                                 wfDebug( "Unexpected special page in recentchanges\n" );
 373                         }
 374                 // Regular entries
 375                 } else {
 376                         wfProfileIn($fname.'-page');
 377
 378                         $this->insertDiffHist($s, $rc, $unpatrolled);
 379
 380                         # M, N, b and ! (minor, new, bot and unpatrolled)
 381                         $s .= $this->recentChangesFlags( $rc_type == RC_NEW, $rc_minor, $unpatrolled, '', $rc_bot );
 382                         $this->insertArticleLink($s, $rc, $unpatrolled, $watched);
 383
 384                         wfProfileOut($fname.'-page');
 385                 }
 386
 387                 wfProfileIn( $fname.'-rest' );
 388
 389                 $this->insertTimestamp($s,$rc);
 390
 391                 if( $wgRCShowChangedSize ) {
 392                         $s .= ( $rc->getCharacterDifference() == '' ? '' : $rc->getCharacterDifference() . ' . . ' );
 393                 }
 394                 # User tool links
 395                 $this->insertUserRelatedLinks($s,$rc);
 396                 # Log action text (if any)
 397                 $this->insertAction($s, $rc);
 398                 # Edit or log comment
 399                 $this->insertComment($s, $rc);
 400
 401                 # Mark revision as deleted if so
 402                 if ( !$rc_log_type && $this->isDeleted($rc,Revision::DELETED_TEXT) )
 403                    $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 404                 if($rc->numberofWatchingusers > 0) {
 405                         $s .= ' ' . wfMsg('number_of_watching_users_RCview',  $wgContLang->formatNum($rc->numberofWatchingusers));
 406                 }
 407
 408                 wfRunHooks( 'OldChangesListRecentChangesLine', array(&$this, &$s, $rc) );
 409
 410                 $s = "<li>$s</li>\n";
 411
 412                 wfProfileOut( $fname.'-rest' );
 413
 414                 wfProfileOut( $fname );
 415                 return $dateheader . $s;
 416         }
 417 }
 418
 419
 420 /**
 421  * Generate a list of changes using an Enhanced system (use javascript).
 422  */
 423 class EnhancedChangesList extends ChangesList {
 424
 425         /**
 426         *  Add the JavaScript file for enhanced changeslist
 427         *  @ return string
 428         */
 429         public function beginRecentChangesList() {
 430                 global $wgStylePath, $wgJsMimeType, $wgStyleVersion;
 431                 $this->rc_cache = array();
 432                 $this->rcMoveIndex = 0;
 433                 $this->rcCacheIndex = 0;
 434                 $this->lastdate = '';
 435                 $this->rclistOpen = false;
 436                 $script = Xml::tags( 'script', array(
 437                         'type' => $wgJsMimeType,
 438                         'src' => $wgStylePath . "/common/enhancedchanges.js?$wgStyleVersion" ), '' );
 439                 return $script;
 440         }
 441         /**
 442          * Format a line for enhanced recentchange (aka with javascript and block of lines).
 443          */
 444         public function recentChangesLine( &$baseRC, $watched = false ) {
 445                 global $wgLang, $wgContLang, $wgUser;
 446
 447                 # Create a specialised object
 448                 $rc = RCCacheEntry::newFromParent( $baseRC );
 449
 450                 # Extract fields from DB into the function scope (rc_xxxx variables)
 451                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 452                 extract( $rc->mAttribs );
 453                 $curIdEq = 'curid=' . $rc_cur_id;
 454
 455                 # If it's a new day, add the headline and flush the cache
 456                 $date = $wgLang->date( $rc_timestamp, true);
 457                 $ret = '';
 458                 if( $date != $this->lastdate ) {
 459                         # Process current cache
 460                         $ret = $this->recentChangesBlock();
 461                         $this->rc_cache = array();
 462                         $ret .= "<h4>{$date}</h4>\n";
 463                         $this->lastdate = $date;
 464                 }
 465
 466                 # Should patrol-related stuff be shown?
 467                 if( $wgUser->useRCPatrol() ) {
 468                         $rc->unpatrolled = !$rc_patrolled;
 469                 } else {
 470                         $rc->unpatrolled = false;
 471                 }
 472
 473                 $showdifflinks = true;
 474                 # Make article link
 475                 // Page moves
 476                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 477                         $msg = ( $rc_type == RC_MOVE ) ? "1movedto2" : "1movedto2_redir";
 478                         $clink = wfMsg( $msg, $this->skin->makeKnownLinkObj( $rc->getTitle(), '', 'redirect=no' ),
 479                           $this->skin->makeKnownLinkObj( $rc->getMovedToTitle(), '' ) );
 480                 // Log entries (old format) and special pages
 481                 } elseif( $rc_namespace == NS_SPECIAL ) {
 482                         list( $specialName, $logtype ) = SpecialPage::resolveAliasWithSubpage( $rc_title );
 483                         if ( $specialName == 'Log' ) {
 484                                 # Log updates, etc
 485                                 $logname = LogPage::logName( $logtype );
 486                                 $clink = '(' . $this->skin->makeKnownLinkObj( $rc->getTitle(), $logname ) . ')';
 487                         } else {
 488                                 wfDebug( "Unexpected special page in recentchanges\n" );
 489                                 $clink = '';
 490                         }
 491                 // New unpatrolled pages
 492                 } else if( $rc->unpatrolled && $rc_type == RC_NEW ) {
 493                         $clink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '', "rcid={$rc_id}" );
 494                 // Log entries
 495                 } else if( $rc_type == RC_LOG ) {
 496                         if( $rc_log_type ) {
 497                                 $logtitle = SpecialPage::getTitleFor( 'Log', $rc_log_type );
 498                                 $clink = '(' . $this->skin->makeKnownLinkObj( $logtitle, LogPage::logName($rc_log_type) ) . ')';
 499                         } else {
 500                                 $clink = $this->skin->makeLinkObj( $rc->getTitle(), '' );
 501                         }
 502                         $watched = false;
 503                 // Edits
 504                 } else {
 505                         $clink = $this->skin->makeKnownLinkObj( $rc->getTitle(), '' );
 506                 }
 507
 508                 # Don't show unusable diff links
 509                 if ( !ChangesList::userCan($rc,Revision::DELETED_TEXT) ) {
 510                         $showdifflinks = false;
 511                 }
 512
 513                 $time = $wgContLang->time( $rc_timestamp, true, true );
 514                 $rc->watched = $watched;
 515                 $rc->link = $clink;
 516                 $rc->timestamp = $time;
 517                 $rc->numberofWatchingusers = $baseRC->numberofWatchingusers;
 518
 519                 # Make "cur" and "diff" links
 520                 if( $rc->unpatrolled ) {
 521                         $rcIdQuery = "&rcid={$rc_id}";
 522                 } else {
 523                         $rcIdQuery = '';
 524                 }
 525                 $querycur = $curIdEq."&diff=0&oldid=$rc_this_oldid";
 526                 $querydiff = $curIdEq."&diff=$rc_this_oldid&oldid=$rc_last_oldid$rcIdQuery";
 527                 $aprops = ' tabindex="'.$baseRC->counter.'"';
 528                 $curLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['cur'], $querycur, '' ,'', $aprops );
 529
 530                 # Make "diff" an "cur" links
 531                 if( !$showdifflinks ) {
 532                    $curLink = $this->message['cur'];
 533                    $diffLink = $this->message['diff'];
 534                 } else if( $rc_type == RC_NEW || $rc_type == RC_LOG || $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 535                         if( $rc_type != RC_NEW ) {
 536                                 $curLink = $this->message['cur'];
 537                         }
 538                         $diffLink = $this->message['diff'];
 539                 } else {
 540                         $diffLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['diff'], $querydiff, '' ,'', $aprops );
 541                 }
 542
 543                 # Make "last" link
 544                 if( !$showdifflinks ) {
 545                     $lastLink = $this->message['last'];
 546                 } else if( $rc_last_oldid == 0 || $rc_type == RC_LOG || $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 547                         $lastLink = $this->message['last'];
 548                 } else {
 549                         $lastLink = $this->skin->makeKnownLinkObj( $rc->getTitle(), $this->message['last'],
 550                         $curIdEq.'&diff='.$rc_this_oldid.'&oldid='.$rc_last_oldid . $rcIdQuery );
 551                 }
 552
 553                 # Make user links
 554                 if( $this->isDeleted($rc,Revision::DELETED_USER) ) {
 555                         $rc->userlink = ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-user') . '</span>';
 556                 } else {
 557                         $rc->userlink = $this->skin->userLink( $rc_user, $rc_user_text );
 558                         $rc->usertalklink = $this->skin->userToolLinks( $rc_user, $rc_user_text );
 559                 }
 560
 561                 $rc->lastlink = $lastLink;
 562                 $rc->curlink  = $curLink;
 563                 $rc->difflink = $diffLink;
 564
 565                 # Put accumulated information into the cache, for later display
 566                 # Page moves go on their own line
 567                 $title = $rc->getTitle();
 568                 $secureName = $title->getPrefixedDBkey();
 569                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 570                         # Use an @ character to prevent collision with page names
 571                         $this->rc_cache['@@' . ($this->rcMoveIndex++)] = array($rc);
 572                 } else {
 573                         # Logs are grouped by type
 574                         if( $rc_type == RC_LOG ){
 575                                 $secureName = SpecialPage::getTitleFor( 'Log', $rc_log_type )->getPrefixedDBkey();
 576                         }
 577                         if( !isset( $this->rc_cache[$secureName] ) ) {
 578                                 $this->rc_cache[$secureName] = array();
 579                         }
 580                         array_push( $this->rc_cache[$secureName], $rc );
 581                 }
 582                 return $ret;
 583         }
 584
 585         /**
 586          * Enhanced RC group
 587          */
 588         protected function recentChangesBlockGroup( $block ) {
 589                 global $wgLang, $wgContLang, $wgRCShowChangedSize;
 590                 $r = '<table cellpadding="0" cellspacing="0" border="0" style="background: none"><tr>';
 591
 592                 # Collate list of users
 593                 $userlinks = array();
 594                 # Other properties
 595                 $unpatrolled = false;
 596                 $isnew = false;
 597                 $curId = $currentRevision = 0;
 598                 # Some catalyst variables...
 599                 $namehidden = true;
 600                 $alllogs = true;
 601                 foreach( $block as $rcObj ) {
 602                         $oldid = $rcObj->mAttribs['rc_last_oldid'];
 603                         if( $rcObj->mAttribs['rc_new'] ) {
 604                                 $isnew = true;
 605                         }
 606                         // If all log actions to this page were hidden, then don't
 607                         // give the name of the affected page for this block!
 608                         if( !$this->isDeleted( $rcObj, LogPage::DELETED_ACTION ) ) {
 609                                 $namehidden = false;
 610                         }
 611                         $u = $rcObj->userlink;
 612                         if( !isset( $userlinks[$u] ) ) {
 613                                 $userlinks[$u] = 0;
 614                         }
 615                         if( $rcObj->unpatrolled ) {
 616                                 $unpatrolled = true;
 617                         }
 618                         if( $rcObj->mAttribs['rc_type'] != RC_LOG ) {
 619                                 $alllogs = false;
 620                         }
 621                         # Get the latest entry with a page_id and oldid
 622                         # since logs may not have these.
 623                         if( !$curId && $rcObj->mAttribs['rc_cur_id'] ) {
 624                                 $curId = $rcObj->mAttribs['rc_cur_id'];
 625                         }
 626                         if( !$currentRevision && $rcObj->mAttribs['rc_this_oldid'] ) {
 627                                 $currentRevision = $rcObj->mAttribs['rc_this_oldid'];
 628                         }
 629
 630                         $bot = $rcObj->mAttribs['rc_bot'];
 631                         $userlinks[$u]++;
 632                 }
 633
 634                 # Sort the list and convert to text
 635                 krsort( $userlinks );
 636                 asort( $userlinks );
 637                 $users = array();
 638                 foreach( $userlinks as $userlink => $count) {
 639                         $text = $userlink;
 640                         $text .= $wgContLang->getDirMark();
 641                         if( $count > 1 ) {
 642                                 $text .= ' (' . $wgLang->formatNum( $count ) . '×)';
 643                         }
 644                         array_push( $users, $text );
 645                 }
 646
 647                 $users = ' <span class="changedby">[' . implode( $this->message['semicolon-separator'], $users ) . ']</span>';
 648
 649                 # ID for JS visibility toggle
 650                 $jsid = $this->rcCacheIndex;
 651                 # onclick handler to toggle hidden/expanded
 652                 $toggleLink = "onclick='toggleVisibility($jsid); return false'";
 653                 # Title for <a> tags
 654                 $expandTitle = htmlspecialchars( wfMsg('rc-enhanced-expand') );
 655                 $closeTitle = htmlspecialchars( wfMsg('rc-enhanced-hide') );
 656
 657                 $tl  = "<span id='mw-rc-openarrow-$jsid' class='mw-changeslist-expanded' style='visibility:hidden'><a href='#' $toggleLink title='$expandTitle'>" . $this->sideArrow() . "</a></span>";
 658                 $tl .= "<span id='mw-rc-closearrow-$jsid' class='mw-changeslist-hidden' style='display:none'><a href='#' $toggleLink title='$closeTitle'>" . $this->downArrow() . "</a></span>";
 659                 $r .= '<td valign="top" style="white-space: nowrap"><tt>'.$tl.'&nbsp;';
 660
 661                 # Main line
 662                 $r .= $this->recentChangesFlags( $isnew, false, $unpatrolled, '&nbsp;', $bot );
 663
 664                 # Timestamp
 665                 $r .= '&nbsp;'.$block[0]->timestamp.'&nbsp;</tt></td><td>';
 666
 667                 # Article link
 668                 if( $namehidden ) {
 669                         $r .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 670                 } else {
 671                         $r .= $this->maybeWatchedLink( $block[0]->link, $block[0]->watched );
 672                 }
 673
 674                 $r .= $wgContLang->getDirMark();
 675
 676                 $curIdEq = 'curid=' . $curId;
 677                 # Changes message
 678                 $n = count($block);
 679                 static $nchanges = array();
 680                 if ( !isset( $nchanges[$n] ) ) {
 681                         $nchanges[$n] = wfMsgExt( 'nchanges', array( 'parsemag', 'escape' ), $wgLang->formatNum( $n ) );
 682                 }
 683                 # Total change link
 684                 $r .= ' ';
 685                 if( !$alllogs ) {
 686                         $r .= '(';
 687                         if( !ChangesList::userCan($rcObj,Revision::DELETED_TEXT) ) {
 688                                 $r .= $nchanges[$n];
 689                         } else if( $isnew ) {
 690                                 $r .= $nchanges[$n];
 691                         } else {
 692                                 $r .= $this->skin->makeKnownLinkObj( $block[0]->getTitle(),
 693                                         $nchanges[$n], $curIdEq."&diff=$currentRevision&oldid=$oldid" );
 694                         }
 695                 }
 696
 697                 # History
 698                 if( $alllogs ) {
 699                         // don't show history link for logs
 700                 } else if( $namehidden || !$block[0]->getTitle()->exists() ) {
 701                         $r .= $this->message['semicolon-separator'] . $this->message['hist'] . ')';
 702                 } else {
 703                         $r .= $this->message['semicolon-separator'] . $this->skin->makeKnownLinkObj( $block[0]->getTitle(),
 704                                 $this->message['hist'], $curIdEq . '&action=history' ) . ')';
 705                 }
 706                 $r .= ' . . ';
 707
 708                 # Character difference (does not apply if only log items)
 709                 if( $wgRCShowChangedSize && !$alllogs ) {
 710                         $last = 0;
 711                         $first = count($block) - 1;
 712                         # Some events (like logs) have an "empty" size, so we need to skip those...
 713                         while( $last < $first && $block[$last]->mAttribs['rc_new_len'] === NULL ) {
 714                                 $last++;
 715                         }
 716                         while( $first > $last && $block[$first]->mAttribs['rc_old_len'] === NULL ) {
 717                                 $first--;
 718                         }
 719                         # Get net change
 720                         $chardiff = $rcObj->getCharacterDifference( $block[$first]->mAttribs['rc_old_len'],
 721                                 $block[$last]->mAttribs['rc_new_len'] );
 722
 723                         if( $chardiff == '' ) {
 724                                 $r .= ' ';
 725                         } else {
 726                                 $r .= ' ' . $chardiff. ' . . ';
 727                         }
 728                 }
 729
 730                 $r .= $users;
 731                 $r .= $this->numberofWatchingusers($block[0]->numberofWatchingusers);
 732
 733                 $r .= "</td></tr></table>\n";
 734
 735                 # Sub-entries
 736                 $r .= '<div id="mw-rc-subentries-'.$jsid.'" class="mw-changeslist-hidden"><table cellpadding="0" cellspacing="0"  border="0" style="background: none">';
 737                 foreach( $block as $rcObj ) {
 738                         # Get rc_xxxx variables
 739                         // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 740                         extract( $rcObj->mAttribs );
 741
 742                         #$r .= '<tr><td valign="top">'.$this->spacerArrow();
 743                         $r .= '<tr><td valign="top">';
 744                         $r .= '<tt>'.$this->spacerIndent() . $this->spacerIndent();
 745                         $r .= $this->recentChangesFlags( $rc_new, $rc_minor, $rcObj->unpatrolled, '&nbsp;', $rc_bot );
 746                         $r .= '&nbsp;</tt></td><td valign="top">';
 747
 748                         $o = '';
 749                         if( $rc_this_oldid != 0 ) {
 750                                 $o = 'oldid='.$rc_this_oldid;
 751                         }
 752                         # Log timestamp
 753                         if( $rc_type == RC_LOG ) {
 754                                 $link = '<tt>'.$rcObj->timestamp.'</tt> ';
 755                         # Revision link
 756                         } else if( !ChangesList::userCan($rcObj,Revision::DELETED_TEXT) ) {
 757                                 $link = '<span class="history-deleted"><tt>'.$rcObj->timestamp.'</tt></span> ';
 758                         } else {
 759                                 $rcIdEq = ($rcObj->unpatrolled && $rc_type == RC_NEW) ? '&rcid='.$rcObj->mAttribs['rc_id'] : '';
 760
 761                                 $link = '<tt>'.$this->skin->makeKnownLinkObj( $rcObj->getTitle(), $rcObj->timestamp, $curIdEq.'&'.$o.$rcIdEq ).'</tt>';
 762                                 if( $this->isDeleted($rcObj,Revision::DELETED_TEXT) )
 763                                         $link = '<span class="history-deleted">'.$link.'</span> ';
 764                         }
 765                         $r .= $link;
 766
 767                         if ( !$rc_type == RC_LOG || $rc_type == RC_NEW ) {
 768                                 $r .= ' (';
 769                                 $r .= $rcObj->curlink;
 770                                 $r .= $this->message['semicolon-separator'];
 771                                 $r .= $rcObj->lastlink;
 772                                 $r .= ')';
 773                         }
 774                         $r .= ' . . ';
 775
 776                         # Character diff
 777                         if( $wgRCShowChangedSize ) {
 778                                 $r .= ( $rcObj->getCharacterDifference() == '' ? '' : $rcObj->getCharacterDifference() . ' . . ' ) ;
 779                         }
 780                         # User links
 781                         $r .= $rcObj->userlink;
 782                         $r .= $rcObj->usertalklink;
 783                         // log action
 784                         parent::insertAction( $r, $rcObj );
 785                         // log comment
 786                         parent::insertComment( $r, $rcObj );
 787                         # Mark revision as deleted
 788                         if( !$rc_log_type && $this->isDeleted($rcObj,Revision::DELETED_TEXT) ) {
 789                                 $r .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 790                         }
 791
 792                         $r .= "</td></tr>\n";
 793                 }
 794                 $r .= "</table></div>\n";
 795
 796                 $this->rcCacheIndex++;
 797                 return $r;
 798         }
 799
 800         /**
 801          * Generate HTML for an arrow or placeholder graphic
 802          * @param string $dir one of '', 'd', 'l', 'r'
 803          * @param string $alt text
 804          * @param string $title text
 805          * @return string HTML <img> tag
 806          */
 807         protected function arrow( $dir, $alt='', $title='' ) {
 808                 global $wgStylePath;
 809                 $encUrl = htmlspecialchars( $wgStylePath . '/common/images/Arr_' . $dir . '.png' );
 810                 $encAlt = htmlspecialchars( $alt );
 811                 $encTitle = htmlspecialchars( $title );
 812                 return "<img src=\"$encUrl\" width=\"12\" height=\"12\" alt=\"$encAlt\" title=\"$encTitle\" />";
 813         }
 814
 815         /**
 816          * Generate HTML for a right- or left-facing arrow,
 817          * depending on language direction.
 818          * @return string HTML <img> tag
 819          */
 820         protected function sideArrow() {
 821                 global $wgContLang;
 822                 $dir = $wgContLang->isRTL() ? 'l' : 'r';
 823                 return $this->arrow( $dir, '+', wfMsg('rc-enhanced-expand') );
 824         }
 825
 826         /**
 827          * Generate HTML for a down-facing arrow
 828          * depending on language direction.
 829          * @return string HTML <img> tag
 830          */
 831         protected function downArrow() {
 832                 return $this->arrow( 'd', '-', wfMsg('rc-enhanced-hide') );
 833         }
 834
 835         /**
 836          * Generate HTML for a spacer image
 837          * @return string HTML <img> tag
 838          */
 839         protected function spacerArrow() {
 840                 return $this->arrow( '', codepointToUtf8( 0xa0 ) ); // non-breaking space
 841         }
 842
 843         /**
 844          * Add a set of spaces
 845          * @return string HTML <td> tag
 846          */
 847         protected function spacerIndent() {
 848                 return '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
 849         }
 850
 851         /**
 852          * Enhanced RC ungrouped line.
 853          * @return string a HTML formated line (generated using $r)
 854          */
 855         protected function recentChangesBlockLine( $rcObj ) {
 856                 global $wgContLang, $wgRCShowChangedSize;
 857
 858                 # Get rc_xxxx variables
 859                 // FIXME: Would be good to replace this extract() call with something that explicitly initializes local variables.
 860                 extract( $rcObj->mAttribs );
 861                 $curIdEq = 'curid='.$rc_cur_id;
 862
 863                 $r = '<table cellspacing="0" cellpadding="0" border="0" style="background: none"><tr>';
 864
 865                 $r .= '<td valign="top" style="white-space: nowrap"><tt>' . $this->spacerArrow() . '&nbsp;';
 866
 867                 # Flag and Timestamp
 868                 if( $rc_type == RC_MOVE || $rc_type == RC_MOVE_OVER_REDIRECT ) {
 869                         $r .= '&nbsp;&nbsp;&nbsp;&nbsp;'; // 4 flags -> 4 spaces
 870                 } else {
 871                         $r .= $this->recentChangesFlags( $rc_type == RC_NEW, $rc_minor, $rcObj->unpatrolled, '&nbsp;', $rc_bot );
 872                 }
 873                 $r .= '&nbsp;'.$rcObj->timestamp.'&nbsp;</tt></td><td>';
 874
 875                 # Article or log link
 876                 if( $rc_log_type ) {
 877                         $logtitle = Title::newFromText( "Log/$rc_log_type", NS_SPECIAL );
 878                         $logname = LogPage::logName( $rc_log_type );
 879                         $r .= '(' . $this->skin->makeKnownLinkObj($logtitle, $logname ) . ')';
 880                 } else if( !$this->userCan($rcObj,Revision::DELETED_TEXT) ) {
 881                         $r .= '<span class="history-deleted">' . $rcObj->link . '</span>';
 882                 } else {
 883                         $r .= $this->maybeWatchedLink( $rcObj->link, $rcObj->watched );
 884                 }
 885
 886                 # Diff and hist links
 887                 if ( $rc_type != RC_LOG ) {
 888                    $r .= ' ('. $rcObj->difflink . $this->message['semicolon-separator'];
 889                    $r .= $this->skin->makeKnownLinkObj( $rcObj->getTitle(), wfMsg( 'hist' ), $curIdEq.'&action=history' ) . ')';
 890                 }
 891                 $r .= ' . . ';
 892
 893                 # Character diff
 894                 if( $wgRCShowChangedSize ) {
 895                         $r .= ( $rcObj->getCharacterDifference() == '' ? '' : $rcObj->getCharacterDifference() . ' . . ' ) ;
 896                 }
 897
 898                 # User/talk
 899                 $r .= ' '.$rcObj->userlink . $rcObj->usertalklink;
 900
 901                 # Log action (if any)
 902                 if( $rc_log_type ) {
 903                         if( $this->isDeleted($rcObj,LogPage::DELETED_ACTION) ) {
 904                                 $r .= ' <span class="history-deleted">' . wfMsgHtml('rev-deleted-event') . '</span>';
 905                         } else {
 906                                 $r .= ' ' . LogPage::actionText( $rc_log_type, $rc_log_action, $rcObj->getTitle(),
 907                                         $this->skin, LogPage::extractParams($rc_params), true, true );
 908                         }
 909                 }
 910
 911                 # Edit or log comment
 912                 if( $rc_type != RC_MOVE && $rc_type != RC_MOVE_OVER_REDIRECT ) {
 913                         // log comment
 914                         if ( $this->isDeleted($rcObj,LogPage::DELETED_COMMENT) ) {
 915                            $r .= ' <span class="history-deleted">' . wfMsg('rev-deleted-comment') . '</span>';
 916                         } else {
 917                           $r .= $this->skin->commentBlock( $rc_comment, $rcObj->getTitle() );
 918                         }
 919                 }
 920
 921                 # Show how many people are watching this if enabled
 922                 $r .= $this->numberofWatchingusers($rcObj->numberofWatchingusers);
 923
 924                 $r .= "</td></tr></table>\n";
 925                 return $r;
 926         }
 927
 928         /**
 929          * If enhanced RC is in use, this function takes the previously cached
 930          * RC lines, arranges them, and outputs the HTML
 931          */
 932         protected function recentChangesBlock() {
 933                 if( count ( $this->rc_cache ) == 0 ) {
 934                         return '';
 935                 }
 936                 $blockOut = '';
 937                 foreach( $this->rc_cache as $block ) {
 938                         if( count( $block ) < 2 ) {
 939                                 $blockOut .= $this->recentChangesBlockLine( array_shift( $block ) );
 940                         } else {
 941                                 $blockOut .= $this->recentChangesBlockGroup( $block );
 942                         }
 943                 }
 944
 945                 return '<div>'.$blockOut.'</div>';
 946         }
 947
 948         /**
 949          * Returns text for the end of RC
 950          * If enhanced RC is in use, returns pretty much all the text
 951          */
 952         public function endRecentChangesList() {
 953                 return $this->recentChangesBlock() . parent::endRecentChangesList();
 954         }
 955
 956 }