includes/SpecialRecentchanges.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  * @subpackage SpecialPage
   6  */
   7
   8 /**
   9  *
  10  */
  11 require_once( 'Feed.php' );
  12 require_once( 'ChangesList.php' );
  13 require_once( 'Revision.php' );
  14
  15 /**
  16  * Constructor
  17  */
  18 function wfSpecialRecentchanges( $par, $specialPage ) {
  19         global $wgUser, $wgOut, $wgRequest, $wgUseRCPatrol;
  20         global $wgRCShowWatchingUsers, $wgShowUpdatedMarker;
  21         global $wgLinkCache;
  22         $fname = 'wfSpecialRecentchanges';
  23
  24         # Get query parameters
  25         $feedFormat = $wgRequest->getVal( 'feed' );
  26
  27         $defaults = array(
  28         /* int  */ 'days' => $wgUser->getDefaultOption('rcdays'),
  29         /* int  */ 'limit' => $wgUser->getDefaultOption('rclimit'),
  30         /* bool */ 'hideminor' => false,
  31         /* bool */ 'hidebots' => true,
  32         /* bool */ 'hideliu' => false,
  33         /* bool */ 'hidepatrolled' => false,
  34         /* text */ 'from' => '',
  35         /* text */ 'namespace' => null,
  36         /* bool */ 'invert' => false,
  37         );
  38
  39         extract($defaults);
  40
  41
  42         $days = $wgUser->getOption( 'rcdays' );
  43         if ( !$days ) { $days = $defaults['days']; }
  44         $days = $wgRequest->getInt( 'days', $days );
  45
  46         $limit = $wgUser->getOption( 'rclimit' );
  47         if ( !$limit ) { $limit = $defaults['limit']; }
  48
  49         #       list( $limit, $offset ) = wfCheckLimits( 100, 'rclimit' );
  50         $limit = $wgRequest->getInt( 'limit', $limit );
  51
  52         /* order of selection: url > preferences > default */
  53         $hideminor = $wgRequest->getBool( 'hideminor', $wgUser->getOption( 'hideminor') ? true : $defaults['hideminor'] );
  54
  55
  56         # As a feed, use limited settings only
  57         if( $feedFormat ) {
  58                 global $wgFeedLimit;
  59                 if( $limit > $wgFeedLimit ) {
  60                         $options['limit'] = $wgFeedLimit;
  61                 }
  62
  63         } else {
  64
  65                 $namespace = $wgRequest->getIntOrNull( 'namespace' );
  66                 $invert = $wgRequest->getBool( 'invert', $defaults['invert'] );
  67                 $hidebots = $wgRequest->getBool( 'hidebots', $defaults['hidebots'] );
  68                 $hideliu = $wgRequest->getBool( 'hideliu', $defaults['hideliu'] );
  69                 $hidepatrolled = $wgRequest->getBool( 'hidepatrolled', $defaults['hidepatrolled'] );
  70                 $from = $wgRequest->getVal( 'from', $defaults['from'] );
  71
  72                 # Get query parameters from path
  73                 if( $par ) {
  74                         $bits = preg_split( '/\s*,\s*/', trim( $par ) );
  75                         foreach ( $bits as $bit ) {
  76                                 if ( 'hidebots' == $bit ) $hidebots = 1;
  77                                 if ( 'bots' == $bit ) $hidebots = 0;
  78                                 if ( 'hideminor' == $bit ) $hideminor = 1;
  79                                 if ( 'minor' == $bit ) $hideminor = 0;
  80                                 if ( 'hideliu' == $bit ) $hideliu = 1;
  81                                 if ( 'hidepatrolled' == $bit ) $hidepatrolled = 1;
  82
  83                                 if ( is_numeric( $bit ) ) {
  84                                         $limit = $bit;
  85                                 }
  86
  87                                 if ( preg_match( '/^limit=(\d+)$/', $bit, $m ) ) {
  88                                         $limit = $m[1];
  89                                 }
  90
  91                                 if ( preg_match( '/^days=(\d+)$/', $bit, $m ) ) {
  92                                         $days = $m[1];
  93                                 }
  94                         }
  95                 }
  96         }
  97
  98         if ( $limit < 0 || $limit > 5000 ) $limit = $defaults['limit'];
  99
 100
 101         # Database connection and caching
 102         $dbr =& wfGetDB( DB_SLAVE );
 103         extract( $dbr->tableNames( 'recentchanges', 'watchlist' ) );
 104
 105
 106         $cutoff_unixtime = time() - ( $days * 86400 );
 107         $cutoff_unixtime = $cutoff_unixtime - ($cutoff_unixtime % 86400);
 108         $cutoff = $dbr->timestamp( $cutoff_unixtime );
 109         if(preg_match('/^[0-9]{14}$/', $from) and $from > wfTimestamp(TS_MW,$cutoff)) {
 110                 $cutoff = $dbr->timestamp($from);
 111         } else {
 112                 $from = $defaults['from'];
 113         }
 114
 115         # 10 seconds server-side caching max
 116         $wgOut->setSquidMaxage( 10 );
 117
 118         # Get last modified date, for client caching
 119         # Don't use this if we are using the patrol feature, patrol changes don't update the timestamp
 120         $lastmod = $dbr->selectField( 'recentchanges', 'MAX(rc_timestamp)', false, $fname );
 121         if ( $feedFormat || !$wgUseRCPatrol ) {
 122                 if( $lastmod && $wgOut->checkLastModified( $lastmod ) ){
 123                         # Client cache fresh and headers sent, nothing more to do.
 124                         return;
 125                 }
 126         }
 127
 128         $hidem  = $hideminor ? 'AND rc_minor=0' : '';
 129         $hidem .= $hidebots ? ' AND rc_bot=0' : '';
 130         $hidem .= $hideliu ? ' AND rc_user=0' : '';
 131         $hidem .= $hidepatrolled ? ' AND rc_patrolled=0' : '';
 132         $hidem .= is_null( $namespace ) ?  '' : ' AND rc_namespace' . ($invert ? '!=' : '=') . $namespace;
 133
 134         // This is the big thing!
 135
 136         $uid = $wgUser->getID();
 137
 138         // Perform query
 139         $sql2 = "SELECT * FROM $recentchanges FORCE INDEX (rc_timestamp) " .
 140           ($uid ? "LEFT OUTER JOIN $watchlist ON wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace " : "") .
 141           "WHERE rc_timestamp > '{$cutoff}' {$hidem} " .
 142           "ORDER BY rc_timestamp DESC";
 143         $sql2 = $dbr->limitResult($sql2, $limit, 0);
 144         $res = $dbr->query( $sql2, $fname );
 145
 146         // Fetch results, prepare a batch link existence check query
 147         $rows = array();
 148         $batch = new LinkBatch;
 149         while( $row = $dbr->fetchObject( $res ) ){
 150                 $rows[] = $row;
 151                 if ( !$feedFormat ) {
 152                         // User page link
 153                         $title = Title::makeTitleSafe( NS_USER, $row->rc_user_text );
 154                         $batch->addObj( $title );
 155
 156                         // User talk
 157                         $title = Title::makeTitleSafe( NS_USER_TALK, $row->rc_user_text );
 158                         $batch->addObj( $title );
 159                 }
 160
 161         }
 162         $dbr->freeResult( $res );
 163
 164         if( $feedFormat ) {
 165                 rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod );
 166         } else {
 167
 168                 # Web output...
 169
 170                 // Run existence checks
 171                 $batch->execute( $wgLinkCache );
 172
 173                 // Output header
 174                 if ( !$specialPage->including() ) {
 175                         $wgOut->addWikiText( wfMsgForContent( "recentchangestext" ) );
 176
 177                         // Dump everything here
 178                         $nondefaults = array();
 179
 180                         wfAppendToArrayIfNotDefault( 'days', $days, $defaults, $nondefaults);
 181                         wfAppendToArrayIfNotDefault( 'limit', $limit , $defaults, $nondefaults);
 182                         wfAppendToArrayIfNotDefault( 'hideminor', $hideminor, $defaults, $nondefaults);
 183                         wfAppendToArrayIfNotDefault( 'hidebots', $hidebots, $defaults, $nondefaults);
 184                         wfAppendToArrayIfNotDefault( 'hideliu', $hideliu, $defaults, $nondefaults);
 185                         wfAppendToArrayIfNotDefault( 'hidepatrolled', $hidepatrolled, $defaults, $nondefaults);
 186                         wfAppendToArrayIfNotDefault( 'from', $from, $defaults, $nondefaults);
 187                         wfAppendToArrayIfNotDefault( 'namespace', $namespace, $defaults, $nondefaults);
 188                         wfAppendToArrayIfNotDefault( 'invert', $invert, $defaults, $nondefaults);
 189
 190                         // Add end of the texts
 191                         $wgOut->addHTML( '<div class="rcoptions">' . rcOptionsPanel( $defaults, $nondefaults ) . "\n" );
 192                         $wgOut->addHTML( rcNamespaceForm( $namespace, $invert, $nondefaults) . '</div>'."\n");
 193                 }
 194
 195                 // And now for the content
 196                 $sk = $wgUser->getSkin();
 197                 $wgOut->setSyndicated( true );
 198
 199                 $list = ChangesList::newFromUser( $wgUser );
 200
 201                 $s = $list->beginRecentChangesList();
 202                 $counter = 1;
 203                 foreach( $rows as $obj ){
 204                         if( $limit == 0) {
 205                                 break;
 206                         }
 207
 208                         if ( ! ( $hideminor     && $obj->rc_minor     ) &&
 209                              ! ( $hidepatrolled && $obj->rc_patrolled ) ) {
 210                                 $rc = RecentChange::newFromRow( $obj );
 211                                 $rc->counter = $counter++;
 212
 213                                 if ($wgShowUpdatedMarker
 214                                         && !empty( $obj->wl_notificationtimestamp )
 215                                         && ($obj->rc_timestamp >= $obj->wl_notificationtimestamp)) {
 216                                                 $rc->notificationtimestamp = true;
 217                                 } else {
 218                                         $rc->notificationtimestamp = false;
 219                                 }
 220
 221                                 if ($wgRCShowWatchingUsers && $wgUser->getOption( 'shownumberswatching' )) {
 222                                         $sql3 = "SELECT COUNT(*) AS n FROM $watchlist WHERE wl_title='" . $dbr->strencode($obj->rc_title) ."' AND wl_namespace=$obj->rc_namespace" ;
 223                                         $res3 = $dbr->query( $sql3, 'wfSpecialRecentChanges');
 224                                         $x = $dbr->fetchObject( $res3 );
 225                                         $rc->numberofWatchingusers = $x->n;
 226                                 } else {
 227                                         $rc->numberofWatchingusers = 0;
 228                                 }
 229                                 $s .= $list->recentChangesLine( $rc, !empty( $obj->wl_user ) );
 230                                 --$limit;
 231                         }
 232                 }
 233                 $s .= $list->endRecentChangesList();
 234                 $wgOut->addHTML( $s );
 235         }
 236 }
 237
 238 function rcOutputFeed( $rows, $feedFormat, $limit, $hideminor, $lastmod ) {
 239         global $messageMemc, $wgDBname, $wgFeedCacheTimeout;
 240         global $wgFeedClasses, $wgTitle, $wgSitename, $wgContLanguageCode;
 241
 242         if( !isset( $wgFeedClasses[$feedFormat] ) ) {
 243                 wfHttpError( 500, "Internal Server Error", "Unsupported feed type." );
 244                 return false;
 245         }
 246
 247         $timekey = "$wgDBname:rcfeed:$feedFormat:timestamp";
 248         $key = "$wgDBname:rcfeed:$feedFormat:limit:$limit:minor:$hideminor";
 249
 250         $feedTitle = $wgSitename . ' - ' . wfMsgForContent( 'recentchanges' ) .
 251                 ' [' . $wgContLanguageCode . ']';
 252         $feed = new $wgFeedClasses[$feedFormat](
 253                 $feedTitle,
 254                 htmlspecialchars( wfMsgForContent( 'recentchangestext' ) ),
 255                 $wgTitle->getFullUrl() );
 256
 257         /**
 258          * Bumping around loading up diffs can be pretty slow, so where
 259          * possible we want to cache the feed output so the next visitor
 260          * gets it quick too.
 261          */
 262         $cachedFeed = false;
 263         if( ( $wgFeedCacheTimeout > 0 ) && ( $feedLastmod = $messageMemc->get( $timekey ) ) ) {
 264                 /**
 265                  * If the cached feed was rendered very recently, we may
 266                  * go ahead and use it even if there have been edits made
 267                  * since it was rendered. This keeps a swarm of requests
 268                  * from being too bad on a super-frequently edited wiki.
 269                  */
 270                 if( time() - wfTimestamp( TS_UNIX, $feedLastmod )
 271                                 < $wgFeedCacheTimeout
 272                         || wfTimestamp( TS_UNIX, $feedLastmod )
 273                                 > wfTimestamp( TS_UNIX, $lastmod ) ) {
 274                         wfDebug( "RC: loading feed from cache ($key; $feedLastmod; $lastmod)...\n" );
 275                         $cachedFeed = $messageMemc->get( $key );
 276                 } else {
 277                         wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
 278                 }
 279         }
 280         if( is_string( $cachedFeed ) ) {
 281                 wfDebug( "RC: Outputting cached feed\n" );
 282                 $feed->httpHeaders();
 283                 echo $cachedFeed;
 284         } else {
 285                 wfDebug( "RC: rendering new feed and caching it\n" );
 286                 ob_start();
 287                 rcDoOutputFeed( $rows, $feed );
 288                 $cachedFeed = ob_get_contents();
 289                 ob_end_flush();
 290
 291                 $expire = 3600 * 24; # One day
 292                 $messageMemc->set( $key, $cachedFeed );
 293                 $messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
 294         }
 295         return true;
 296 }
 297
 298 function rcDoOutputFeed( $rows, &$feed ) {
 299         global $wgSitename, $wgFeedClasses, $wgContLanguageCode;
 300         $fname = 'rcDoOutputFeed';
 301         wfProfileIn( $fname );
 302
 303         $feed->outHeader();
 304
 305         # Merge adjacent edits by one user
 306         $sorted = array();
 307         $n = 0;
 308         foreach( $rows as $obj ) {
 309                 if( $n > 0 &&
 310                         $obj->rc_namespace >= 0 &&
 311                         $obj->rc_cur_id == $sorted[$n-1]->rc_cur_id &&
 312                         $obj->rc_user_text == $sorted[$n-1]->rc_user_text ) {
 313                         $sorted[$n-1]->rc_last_oldid = $obj->rc_last_oldid;
 314                 } else {
 315                         $sorted[$n] = $obj;
 316                         $n++;
 317                 }
 318                 $first = false;
 319         }
 320
 321         foreach( $sorted as $obj ) {
 322                 $title = Title::makeTitle( $obj->rc_namespace, $obj->rc_title );
 323                 $talkpage = $title->getTalkPage();
 324                 $item = new FeedItem(
 325                         $title->getPrefixedText(),
 326                         rcFormatDiff( $obj ),
 327                         $title->getFullURL(),
 328                         $obj->rc_timestamp,
 329                         $obj->rc_user_text,
 330                         $talkpage->getFullURL()
 331                         );
 332                 $feed->outItem( $item );
 333         }
 334         $feed->outFooter();
 335         wfProfileOut( $fname );
 336 }
 337
 338 /**
 339  *
 340  */
 341 function rcCountLink( $lim, $d, $page='Recentchanges', $more='' ) {
 342         global $wgUser, $wgLang, $wgContLang;
 343         $sk = $wgUser->getSkin();
 344         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 345           ($lim ? $wgLang->formatNum( "{$lim}" ) : wfMsg( 'recentchangesall' ) ), "{$more}" .
 346           ($d ? "days={$d}&" : '') . 'limit='.$lim );
 347         return $s;
 348 }
 349
 350 /**
 351  *
 352  */
 353 function rcDaysLink( $lim, $d, $page='Recentchanges', $more='' ) {
 354         global $wgUser, $wgLang, $wgContLang;
 355         $sk = $wgUser->getSkin();
 356         $s = $sk->makeKnownLink( $wgContLang->specialPage( $page ),
 357           ($d ? $wgLang->formatNum( "{$d}" ) : wfMsg( 'recentchangesall' ) ), $more.'days='.$d .
 358           ($lim ? '&limit='.$lim : '') );
 359         return $s;
 360 }
 361
 362 /**
 363  * Used by Recentchangeslinked
 364  */
 365 function rcDayLimitLinks( $days, $limit, $page='Recentchanges', $more='', $doall = false, $minorLink = '',
 366         $botLink = '', $liuLink = '', $patrLink = '' ) {
 367         if ($more != '') $more .= '&';
 368         $cl = rcCountLink( 50, $days, $page, $more ) . ' | ' .
 369           rcCountLink( 100, $days, $page, $more  ) . ' | ' .
 370           rcCountLink( 250, $days, $page, $more  ) . ' | ' .
 371           rcCountLink( 500, $days, $page, $more  ) .
 372           ( $doall ? ( ' | ' . rcCountLink( 0, $days, $page, $more ) ) : '' );
 373         $dl = rcDaysLink( $limit, 1, $page, $more  ) . ' | ' .
 374           rcDaysLink( $limit, 3, $page, $more  ) . ' | ' .
 375           rcDaysLink( $limit, 7, $page, $more  ) . ' | ' .
 376           rcDaysLink( $limit, 14, $page, $more  ) . ' | ' .
 377           rcDaysLink( $limit, 30, $page, $more  ) .
 378           ( $doall ? ( ' | ' . rcDaysLink( $limit, 0, $page, $more ) ) : '' );
 379         $shm = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 380         $note = wfMsg( 'rclinks', $cl, $dl, $shm );
 381         return $note;
 382 }
 383
 384
 385 /**
 386  * Makes change an option link which carries all the other options
 387  */
 388 function makeOptionsLink( $title, $override, $options ) {
 389         global $wgUser, $wgLang, $wgContLang;
 390         $sk = $wgUser->getSkin();
 391         return $sk->makeKnownLink( $wgContLang->specialPage( 'Recentchanges' ),
 392                 $title, wfArrayToCGI( $override, $options ) );
 393 }
 394
 395 /**
 396  * Creates the options panel
 397  */
 398 function rcOptionsPanel( $defaults, $nondefaults ) {
 399         global $wgLang;
 400
 401         $options = $nondefaults + $defaults;
 402
 403         if( $options['from'] )
 404                 $note = wfMsg( 'rcnotefrom', $wgLang->formatNum( $options['limit'] ), $wgLang->timeanddate( $options['from'], true ) );
 405         else
 406                 $note = wfMsg( 'rcnote', $wgLang->formatNum( $options['limit'] ), $wgLang->formatNum( $options['days'] ) );
 407
 408         // limit links
 409         $cl = '';
 410         $options_limit = array(50, 100, 250, 500);
 411         $i = 0;
 412         while ( $i+1 < count($options_limit) ) {
 413                 $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) . ' | ' ;
 414                 $i++;
 415         }
 416         $cl .=  makeOptionsLink( $options_limit[$i], array( 'limit' => $options_limit[$i] ), $nondefaults) ;
 417
 418         // day links, reset 'from' to none
 419         $dl = '';
 420         $options_days = array(1, 3, 7, 14, 30);
 421         $i = 0;
 422         while ( $i+1 < count($options_days) ) {
 423                 $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) . ' | ' ;
 424                 $i++;
 425         }
 426         $dl .=  makeOptionsLink( $options_days[$i], array( 'days' => $options_days[$i], 'from' => '' ), $nondefaults) ;
 427
 428         // show/hide links
 429         $showhide = array( wfMsg( 'show' ), wfMsg( 'hide' ));
 430         $minorLink = makeOptionsLink( $showhide[1-$options['hideminor']],
 431                 array( 'hideminor' => 1-$options['hideminor'] ), $nondefaults);
 432         $botLink = makeOptionsLink( $showhide[1-$options['hidebots']],
 433                 array( 'hidebots' => 1-$options['hidebots'] ), $nondefaults);
 434         $liuLink   = makeOptionsLink( $showhide[1-$options['hideliu']],
 435                 array( 'hideliu' => 1-$options['hideliu'] ), $nondefaults);
 436         $patrLink  = makeOptionsLink( $showhide[1-$options['hidepatrolled']],
 437                 array( 'hidepatrolled' => 1-$options['hidepatrolled'] ), $nondefaults);
 438
 439         $hl = wfMsg( 'showhideminor', $minorLink, $botLink, $liuLink, $patrLink );
 440
 441         // show from this onward link
 442         $now = $wgLang->timeanddate( wfTimestampNow(), true );
 443         $tl =  makeOptionsLink( $now, array( 'from' => wfTimestampNow()), $nondefaults );
 444
 445         $rclinks = wfMsg( 'rclinks', $cl, $dl, $hl );
 446         $rclistfrom = wfMsg( 'rclistfrom', $tl );
 447         return "$note<br />$rclinks<br />$rclistfrom";
 448
 449 }
 450
 451 /**<F2>
 452  * Creates the choose namespace selection
 453  *
 454  * @access private
 455  *
 456  * @param mixed $namespace The key of the currently selected namespace, empty string
 457  *              if there is none
 458  * @param bool $invert Whether to invert the namespace selection
 459  * @param array $nondefaults An array of non default options to be remembered
 460  *
 461  * @return string
 462  */
 463 function rcNamespaceForm ( $namespace, $invert, $nondefaults ) {
 464         global $wgContLang, $wgScript;
 465         $t = Title::makeTitle( NS_SPECIAL, 'Recentchanges' );
 466
 467         $namespaceselect = HTMLnamespaceselector($namespace, '');
 468         $submitbutton = '<input type="submit" value="' . wfMsgHtml( 'allpagessubmit' ) . "\" />\n";
 469         $invertbox = "<input type='checkbox' name='invert' value='1' id='nsinvert'" . ( $invert ? ' checked="checked"' : '' ) . ' />';
 470
 471         $out = "<div class='namespacesettings'><form method='get' action='{$wgScript}'>\n";
 472
 473         foreach ( $nondefaults as $key => $value ) {
 474                 if ($key != 'namespace' && $key != 'invert')
 475                         $out .= wfElement('input', array( 'type' => 'hidden', 'name' => $key, 'value' => $value));
 476         }
 477
 478         $out .= '<input type="hidden" name="title" value="'.$t->getPrefixedText().'" />';
 479         $out .= "
 480 <div id='nsselect' class='recentchanges'>
 481         <label for='namespace'>" . wfMsgHtml('namespace') . "</label>
 482         {$namespaceselect}{$submitbutton}{$invertbox} <label for='nsinvert'>" . wfMsgHtml('invert') . "</label>\n</div>";
 483         $out .= '</form></div>';
 484         return $out;
 485 }
 486
 487
 488 /**
 489  * Format a diff for the newsfeed
 490  */
 491 function rcFormatDiff( $row ) {
 492         global $wgFeedDiffCutoff, $wgContLang;
 493         $fname = 'rcFormatDiff';
 494         wfProfileIn( $fname );
 495
 496         require_once( 'DifferenceEngine.php' );
 497         $completeText = '<p>' . htmlspecialchars( $row->rc_comment ) . "</p>\n";
 498
 499         if( $row->rc_namespace >= 0 ) {
 500                 if( $row->rc_last_oldid ) {
 501                         wfProfileIn( "$fname-dodiff" );
 502
 503                         $titleObj = Title::makeTitle( $row->rc_namespace, $row->rc_title );
 504                         $de = new DifferenceEngine( $titleObj, $row->rc_last_oldid, $row->rc_this_oldid );
 505                         $diffText = $de->getDiff( wfMsg( 'revisionasof', $wgContLang->timeanddate( $row->rc_timestamp ) ),
 506                                 wfMsg( 'currentrev' ) );
 507
 508                         if ( strlen( $diffText ) > $wgFeedDiffCutoff ) {
 509                                 // Omit large diffs
 510                                 $diffLink = $titleObj->escapeFullUrl(
 511                                         'diff=' . $row->rc_this_oldid .
 512                                         '&oldid=' . $row->rc_last_oldid );
 513                                 $diffText = '<a href="' .
 514                                         $diffLink .
 515                                         '">' .
 516                                         htmlspecialchars( wfMsgForContent( 'difference' ) ) .
 517                                         '</a>';
 518                         } elseif ( $diffText === false ) {
 519                                 // Error in diff engine, probably a missing revision
 520                                 $diffText = "<p>Can't load revision $row->rc_this_oldid</p>";
 521                         } else {
 522                                 // Diff output fine, clean up any illegal UTF-8
 523                                 $diffText = UtfNormal::cleanUp( $diffText );
 524                         }
 525                         wfProfileOut( "$fname-dodiff" );
 526                 } else {
 527                         $rev = Revision::newFromId( $row->rc_this_oldid );
 528                         if( is_null( $rev ) ) {
 529                                 $newtext = '';
 530                         } else {
 531                                 $newtext = $rev->getText();
 532                         }
 533                         $diffText = '<p><b>' . wfMsg( 'newpage' ) . '</b></p>' .
 534                                 '<div>' . nl2br( htmlspecialchars( $newtext ) ) . '</div>';
 535                 }
 536                 $completeText .= $diffText;
 537         }
 538
 539         wfProfileOut( $fname );
 540         return $completeText;
 541 }
 542
 543 ?>