includes/PageHistory.php

   1 <?php
   2 /**
   3  * Page history
   4  *
   5  * Split off from Article.php and Skin.php, 2003-12-22
   6  * @file
   7  */
   8
   9 /**
  10  * This class handles printing the history page for an article.  In order to
  11  * be efficient, it uses timestamps rather than offsets for paging, to avoid
  12  * costly LIMIT,offset queries.
  13  *
  14  * Construct it by passing in an Article, and call $h->history() to print the
  15  * history.
  16  *
  17  */
  18 class PageHistory {
  19         const DIR_PREV = 0;
  20         const DIR_NEXT = 1;
  21
  22         var $mArticle, $mTitle, $mSkin;
  23         var $lastdate;
  24         var $linesonpage;
  25         var $mLatestId = null;
  26
  27         private $mOldIdChecked = 0;
  28
  29         /**
  30          * Construct a new PageHistory.
  31          *
  32          * @param Article $article
  33          * @returns nothing
  34          */
  35         function __construct( $article ) {
  36                 global $wgUser;
  37                 $this->mArticle =& $article;
  38                 $this->mTitle =& $article->mTitle;
  39                 $this->mSkin = $wgUser->getSkin();
  40                 $this->preCacheMessages();
  41         }
  42
  43         function getArticle() {
  44                 return $this->mArticle;
  45         }
  46
  47         function getTitle() {
  48                 return $this->mTitle;
  49         }
  50
  51         /**
  52          * As we use the same small set of messages in various methods and that
  53          * they are called often, we call them once and save them in $this->message
  54          */
  55         function preCacheMessages() {
  56                 // Precache various messages
  57                 if( !isset( $this->message ) ) {
  58                         foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
  59                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
  60                         }
  61                 }
  62         }
  63
  64         /**
  65          * Print the history page for an article.
  66          *
  67          * @returns nothing
  68          */
  69         function history() {
  70                 global $wgOut, $wgRequest, $wgTitle, $wgScript;
  71
  72                 /*
  73                  * Allow client caching.
  74                  */
  75                 if( $wgOut->checkLastModified( $this->mArticle->getTouched() ) )
  76                         return; // Client cache fresh and headers sent, nothing more to do.
  77
  78                 wfProfileIn( __METHOD__ );
  79
  80                 /*
  81                  * Setup page variables.
  82                  */
  83                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->mTitle->getPrefixedText() ) );
  84                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  85                 $wgOut->setArticleFlag( false );
  86                 $wgOut->setArticleRelated( true );
  87                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  88                 $wgOut->setSyndicated( true );
  89                 $wgOut->setFeedAppendQuery( 'action=history' );
  90                 $wgOut->addScriptFile( 'history.js' );
  91
  92                 $logPage = SpecialPage::getTitleFor( 'Log' );
  93                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ),
  94                         'page=' . $this->mTitle->getPrefixedUrl() );
  95                 $wgOut->setSubtitle( $logLink );
  96
  97                 $feedType = $wgRequest->getVal( 'feed' );
  98                 if( $feedType ) {
  99                         wfProfileOut( __METHOD__ );
 100                         return $this->feed( $feedType );
 101                 }
 102
 103                 /*
 104                  * Fail if article doesn't exist.
 105                  */
 106                 if( !$this->mTitle->exists() ) {
 107                         $wgOut->addWikiMsg( 'nohistory' );
 108                         wfProfileOut( __METHOD__ );
 109                         return;
 110                 }
 111
 112                 /**
 113                  * Add date selector to quickly get to a certain time
 114                  */
 115                 $year = $wgRequest->getInt( 'year' );
 116                 $month = $wgRequest->getInt( 'month' );
 117                 $tagFilter = $wgRequest->getVal( 'tagfilter' );
 118                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 119
 120                 $action = htmlspecialchars( $wgScript );
 121                 $wgOut->addHTML(
 122                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 123                         Xml::fieldset( wfMsg( 'history-fieldset-title' ), false, array( 'id' => 'mw-history-search' ) ) .
 124                         Xml::hidden( 'title', $this->mTitle->getPrefixedDBKey() ) . "\n" .
 125                         Xml::hidden( 'action', 'history' ) . "\n" .
 126                         xml::dateMenu( $year, $month ) . '&nbsp;' .
 127                         ( $tagSelector ? ( implode( '&nbsp;', $tagSelector ) . '&nbsp;' ) : '' ) .
 128                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 129                         '</fieldset></form>'
 130                 );
 131
 132                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
 133
 134                 /**
 135                  * Do the list
 136                  */
 137                 $pager = new PageHistoryPager( $this, $year, $month, $tagFilter );
 138                 $this->linesonpage = $pager->getNumRows();
 139                 $wgOut->addHTML(
 140                         $pager->getNavigationBar() .
 141                         $this->beginHistoryList() .
 142                         $pager->getBody() .
 143                         $this->endHistoryList() .
 144                         $pager->getNavigationBar()
 145                 );
 146
 147                 wfProfileOut( __METHOD__ );
 148         }
 149
 150         /**
 151          * Creates begin of history list with a submit button
 152          *
 153          * @return string HTML output
 154          */
 155         function beginHistoryList() {
 156                 global $wgTitle, $wgScript, $wgEnableHtmlDiff;
 157                 $this->lastdate = '';
 158                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 159                 $s .= Xml::openElement( 'form', array( 'action' => $wgScript, 'id' => 'mw-history-compare' ) );
 160                 $s .= Xml::hidden( 'title', $wgTitle->getPrefixedDbKey() );
 161                 if( $wgEnableHtmlDiff ) {
 162                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 163                                 array(
 164                                                 'name' => 'htmldiff',
 165                                                 'class'     => 'historysubmit',
 166                                                 'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 167                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 168                                 )
 169                         );
 170                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 171                                 array(
 172                                                 'class'     => 'historysubmit',
 173                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 174                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 175                                 )
 176                         );
 177                 } else {
 178                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 179                                 array(
 180                                                 'class'     => 'historysubmit',
 181                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 182                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 183                                 )
 184                         );
 185                 }
 186                 $s .= '<ul id="pagehistory">' . "\n";
 187                 return $s;
 188         }
 189
 190         /**
 191          * Creates end of history list with a submit button
 192          *
 193          * @return string HTML output
 194          */
 195         function endHistoryList() {
 196                 global $wgEnableHtmlDiff;
 197                 $s = '</ul>';
 198                 if( $wgEnableHtmlDiff ) {
 199                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 200                                 array(
 201                                                 'name' => 'htmldiff',
 202                                                 'class'     => 'historysubmit',
 203                                                 'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 204                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 205                                 )
 206                         );
 207                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 208                                 array(
 209                                                 'class'     => 'historysubmit',
 210                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 211                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 212                                 )
 213                         );
 214                 } else {
 215                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 216                                 array(
 217                                                 'class'     => 'historysubmit',
 218                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 219                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 220                                 )
 221                         );
 222                 }
 223                 $s .= '</form>';
 224                 return $s;
 225         }
 226
 227         /**
 228          * Creates a submit button
 229          *
 230          * @param array $attributes attributes
 231          * @return string HTML output for the submit button
 232          */
 233         function submitButton($message, $attributes = array() ) {
 234                 # Disable submit button if history has 1 revision only
 235                 if( $this->linesonpage > 1 ) {
 236                         return Xml::submitButton( $message , $attributes );
 237                 } else {
 238                         return '';
 239                 }
 240         }
 241
 242         /**
 243          * Returns a row from the history printout.
 244          *
 245          * @todo document some more, and maybe clean up the code (some params redundant?)
 246          *
 247          * @param Row $row The database row corresponding to the previous line.
 248          * @param mixed $next The database row corresponding to the next line.
 249          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 250          * @param $notificationtimestamp
 251          * @param bool $latest Whether this row corresponds to the page's latest revision.
 252          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 253          * @return string HTML output for the row
 254          */
 255         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false,
 256                 $latest = false, $firstInList = false )
 257         {
 258                 global $wgUser, $wgLang;
 259                 $rev = new Revision( $row );
 260                 $rev->setTitle( $this->mTitle );
 261
 262                 $curlink = $this->curLink( $rev, $latest );
 263                 $lastlink = $this->lastLink( $rev, $next, $counter );
 264                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 265                 $link = $this->revLink( $rev );
 266                 $classes = array();
 267
 268                 $s = "($curlink) ($lastlink) $arbitrary";
 269
 270                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 271                         if( $latest ) {
 272                                 // We don't currently handle well changing the top revision's settings
 273                                 $del = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.
 274                                         $this->message['rev-delundel'].')' );
 275                         } else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 276                                 // If revision was hidden from sysops
 277                                 $del = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.
 278                                         $this->message['rev-delundel'].')' );
 279                         } else {
 280                                 $query = array( 'target' => $this->mTitle->getPrefixedDbkey(),
 281                                         'oldid' => $rev->getId()
 282                                 );
 283                                 $del = $this->mSkin->revDeleteLink( $query, $rev->isDeleted( Revision::DELETED_RESTRICTED ) );
 284                         }
 285                         $s .= " $del ";
 286                 }
 287
 288                 $s .= " $link";
 289                 $s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
 290
 291                 if( $rev->isMinor() ) {
 292                         $s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 293                 }
 294
 295                 if( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 296                         $s .= ' ' . $this->mSkin->formatRevisionSize( $size );
 297                 }
 298
 299                 $s .= $this->mSkin->revComment( $rev, false, true );
 300
 301                 if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
 302                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 303                 }
 304                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 305                         $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 306                 }
 307
 308                 $tools = array();
 309
 310                 if( !is_null( $next ) && is_object( $next ) ) {
 311                         if( $latest && $this->mTitle->userCan( 'rollback' ) && $this->mTitle->userCan( 'edit' ) ) {
 312                                 $tools[] = '<span class="mw-rollback-link">'.$this->mSkin->buildRollbackLink( $rev ).'</span>';
 313                         }
 314
 315                         if( $this->mTitle->quickUserCan( 'edit' ) && !$rev->isDeleted( Revision::DELETED_TEXT ) &&
 316                                 !$next->rev_deleted & Revision::DELETED_TEXT )
 317                         {
 318                                 # Create undo tooltip for the first (=latest) line only
 319                                 $undoTooltip = $latest
 320                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 321                                         : array();
 322                                 $undolink = $this->mSkin->link(
 323                                         $this->mTitle,
 324                                         wfMsgHtml( 'editundo' ),
 325                                         $undoTooltip,
 326                                         array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
 327                                         array( 'known', 'noclasses' )
 328                                 );
 329                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 330                         }
 331                 }
 332
 333                 if( $tools ) {
 334                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 335                 }
 336
 337                 # Tags
 338                 list($tagSummary, $newClasses) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 339                 $classes = array_merge( $classes, $newClasses );
 340                 $s .= " $tagSummary";
 341
 342                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 343
 344                 $classes = implode( ' ', $classes );
 345
 346                 return "<li class=\"$classes\">$s</li>\n";
 347         }
 348
 349         /**
 350          * Create a link to view this revision of the page
 351          * @param Revision $rev
 352          * @returns string
 353          */
 354         function revLink( $rev ) {
 355                 global $wgLang;
 356                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 357                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 358                         $link = $this->mSkin->makeKnownLinkObj( $this->mTitle, $date, "oldid=" . $rev->getId() );
 359                 } else {
 360                         $link = $date;
 361                 }
 362                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 363                         $link = "<span class=\"history-deleted\">$link</span>";
 364                 }
 365                 return $link;
 366         }
 367
 368         /**
 369          * Create a diff-to-current link for this revision for this page
 370          * @param Revision $rev
 371          * @param Bool $latest, this is the latest revision of the page?
 372          * @returns string
 373          */
 374         function curLink( $rev, $latest ) {
 375                 $cur = $this->message['cur'];
 376                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 377                         return $cur;
 378                 } else {
 379                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $cur,
 380                                 'diff=' . $this->mTitle->getLatestRevID() . "&oldid=" . $rev->getId() );
 381                 }
 382         }
 383
 384         /**
 385          * Create a diff-to-previous link for this revision for this page.
 386          * @param Revision $prevRev, the previous revision
 387          * @param mixed $next, the newer revision
 388          * @param int $counter, what row on the history list this is
 389          * @returns string
 390          */
 391         function lastLink( $prevRev, $next, $counter ) {
 392                 $last = $this->message['last'];
 393                 # $next may either be a Row, null, or "unkown"
 394                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 395                 if( is_null($next) ) {
 396                         # Probably no next row
 397                         return $last;
 398                 } elseif( $next === 'unknown' ) {
 399                         # Next row probably exists but is unknown, use an oldid=prev link
 400                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 401                                 "diff=" . $prevRev->getId() . "&oldid=prev" );
 402                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 403                         return $last;
 404                 } else {
 405                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 406                                 "diff=" . $prevRev->getId() . "&oldid={$next->rev_id}" );
 407                 }
 408         }
 409
 410         /**
 411          * Create radio buttons for page history
 412          *
 413          * @param object $rev Revision
 414          * @param bool $firstInList Is this version the first one?
 415          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 416          * @return string HTML output for the radio buttons
 417          */
 418         function diffButtons( $rev, $firstInList, $counter ) {
 419                 if( $this->linesonpage > 1 ) {
 420                         $radio = array( 'type'  => 'radio', 'value' => $rev->getId() );
 421                         /** @todo: move title texts to javascript */
 422                         if( $firstInList ) {
 423                                 $first = Xml::element( 'input',
 424                                         array_merge( $radio, array( 'style' => 'visibility:hidden', 'name'  => 'oldid' ) )
 425                                 );
 426                                 $checkmark = array( 'checked' => 'checked' );
 427                         } else {
 428                                 # Check visibility of old revisions
 429                                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 430                                         $radio['disabled'] = 'disabled';
 431                                         $checkmark = array(); // We will check the next possible one
 432                                 } else if( $counter == 2 || !$this->mOldIdChecked ) {
 433                                         $checkmark = array( 'checked' => 'checked' );
 434                                         $this->mOldIdChecked = $rev->getId();
 435                                 } else {
 436                                         $checkmark = array();
 437                                 }
 438                                 $first = Xml::element( 'input', array_merge( $radio, $checkmark, array( 'name'  => 'oldid' ) ) );
 439                                 $checkmark = array();
 440                         }
 441                         $second = Xml::element( 'input', array_merge( $radio, $checkmark, array( 'name'  => 'diff' ) ) );
 442                         return $first . $second;
 443                 } else {
 444                         return '';
 445                 }
 446         }
 447
 448         /**
 449          * Fetch an array of revisions, specified by a given limit, offset and
 450          * direction. This is now only used by the feeds. It was previously
 451          * used by the main UI but that's now handled by the pager.
 452          */
 453         function fetchRevisions($limit, $offset, $direction) {
 454                 $dbr = wfGetDB( DB_SLAVE );
 455
 456                 if( $direction == PageHistory::DIR_PREV )
 457                         list($dirs, $oper) = array("ASC", ">=");
 458                 else /* $direction == PageHistory::DIR_NEXT */
 459                         list($dirs, $oper) = array("DESC", "<=");
 460
 461                 if( $offset )
 462                         $offsets = array("rev_timestamp $oper '$offset'");
 463                 else
 464                         $offsets = array();
 465
 466                 $page_id = $this->mTitle->getArticleID();
 467
 468                 return $dbr->select( 'revision',
 469                         Revision::selectFields(),
 470                         array_merge(array("rev_page=$page_id"), $offsets),
 471                         __METHOD__,
 472                         array( 'ORDER BY' => "rev_timestamp $dirs",
 473                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 474                 );
 475         }
 476
 477         /**
 478          * Output a subscription feed listing recent edits to this page.
 479          * @param string $type
 480          */
 481         function feed( $type ) {
 482                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 483                 if( !FeedUtils::checkFeedOutput($type) ) {
 484                         return;
 485                 }
 486
 487                 $feed = new $wgFeedClasses[$type](
 488                 $this->mTitle->getPrefixedText() . ' - ' .
 489                 wfMsgForContent( 'history-feed-title' ),
 490                 wfMsgForContent( 'history-feed-description' ),
 491                 $this->mTitle->getFullUrl( 'action=history' ) );
 492
 493                 // Get a limit on number of feed entries. Provide a sane default
 494                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 495                 $limit = $wgRequest->getInt( 'limit', 10 );
 496                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 497                         $limit = 10;
 498                 }
 499                 $items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
 500
 501                 $feed->outHeader();
 502                 if( $items ) {
 503                         foreach( $items as $row ) {
 504                                 $feed->outItem( $this->feedItem( $row ) );
 505                         }
 506                 } else {
 507                         $feed->outItem( $this->feedEmpty() );
 508                 }
 509                 $feed->outFooter();
 510         }
 511
 512         function feedEmpty() {
 513                 global $wgOut;
 514                 return new FeedItem(
 515                         wfMsgForContent( 'nohistory' ),
 516                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 517                         $this->mTitle->getFullUrl(),
 518                         wfTimestamp( TS_MW ),
 519                                 '',
 520                         $this->mTitle->getTalkPage()->getFullUrl() );
 521         }
 522
 523         /**
 524          * Generate a FeedItem object from a given revision table row
 525          * Borrows Recent Changes' feed generation functions for formatting;
 526          * includes a diff to the previous revision (if any).
 527          *
 528          * @param $row
 529          * @return FeedItem
 530          */
 531         function feedItem( $row ) {
 532                 $rev = new Revision( $row );
 533                 $rev->setTitle( $this->mTitle );
 534                 $text = FeedUtils::formatDiffRow( $this->mTitle,
 535                 $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 536                 $rev->getId(),
 537                 $rev->getTimestamp(),
 538                 $rev->getComment() );
 539
 540                 if( $rev->getComment() == '' ) {
 541                         global $wgContLang;
 542                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 543                         $rev->getUserText(),
 544                         $wgContLang->timeanddate( $rev->getTimestamp() ) );
 545                 } else {
 546                         $title = $rev->getUserText() . wfMsgForContent( 'colon-separator' ) . FeedItem::stripComment( $rev->getComment() );
 547                 }
 548
 549                 return new FeedItem(
 550                         $title,
 551                         $text,
 552                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 553                         $rev->getTimestamp(),
 554                         $rev->getUserText(),
 555                         $this->mTitle->getTalkPage()->getFullUrl() );
 556         }
 557 }
 558
 559
 560 /**
 561  * @ingroup Pager
 562  */
 563 class PageHistoryPager extends ReverseChronologicalPager {
 564         public $mLastRow = false, $mPageHistory, $mTitle;
 565
 566         function __construct( $pageHistory, $year='', $month='', $tagFilter = '' ) {
 567                 parent::__construct();
 568                 $this->mPageHistory = $pageHistory;
 569                 $this->mTitle =& $this->mPageHistory->mTitle;
 570                 $this->tagFilter = $tagFilter;
 571                 $this->getDateCond( $year, $month );
 572         }
 573
 574         function getQueryInfo() {
 575                 $queryInfo = array(
 576                         'tables'  => array('revision'),
 577                         'fields'  => array_merge( Revision::selectFields(), array('ts_tags') ),
 578                         'conds'   => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 579                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') ),
 580                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 581                 );
 582                 ChangeTags::modifyDisplayQuery( $queryInfo['tables'],
 583                                                                                 $queryInfo['fields'],
 584                                                                                 $queryInfo['conds'],
 585                                                                                 $queryInfo['join_conds'],
 586                                                                                 $queryInfo['options'],
 587                                                                                 $this->tagFilter );
 588                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 589                 return $queryInfo;
 590         }
 591
 592         function getIndexField() {
 593                 return 'rev_timestamp';
 594         }
 595
 596         function formatRow( $row ) {
 597                 if( $this->mLastRow ) {
 598                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 599                         $firstInList = $this->mCounter == 1;
 600                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 601                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 602                 } else {
 603                         $s = '';
 604                 }
 605                 $this->mLastRow = $row;
 606                 return $s;
 607         }
 608
 609         function getStartBody() {
 610                 $this->mLastRow = false;
 611                 $this->mCounter = 1;
 612                 return '';
 613         }
 614
 615         function getEndBody() {
 616                 if( $this->mLastRow ) {
 617                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 618                         $firstInList = $this->mCounter == 1;
 619                         if( $this->mIsBackwards ) {
 620                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 621                                 if( $this->mOffset == '' ) {
 622                                         $next = null;
 623                                 } else {
 624                                         $next = 'unknown';
 625                                 }
 626                         } else {
 627                                 # The next row is the past-the-end row
 628                                 $next = $this->mPastTheEndRow;
 629                         }
 630                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 631                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 632                 } else {
 633                         $s = '';
 634                 }
 635                 return $s;
 636         }
 637 }