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         /**
  28          * Construct a new PageHistory.
  29          *
  30          * @param Article $article
  31          * @returns nothing
  32          */
  33         function __construct( $article ) {
  34                 global $wgUser;
  35                 $this->mArticle =& $article;
  36                 $this->mTitle =& $article->mTitle;
  37                 $this->mSkin = $wgUser->getSkin();
  38                 $this->preCacheMessages();
  39         }
  40
  41         function getArticle() {
  42                 return $this->mArticle;
  43         }
  44
  45         function getTitle() {
  46                 return $this->mTitle;
  47         }
  48
  49         /**
  50          * As we use the same small set of messages in various methods and that
  51          * they are called often, we call them once and save them in $this->message
  52          */
  53         function preCacheMessages() {
  54                 // Precache various messages
  55                 if( !isset( $this->message ) ) {
  56                         foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
  57                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
  58                         }
  59                 }
  60         }
  61
  62         /**
  63          * Print the history page for an article.
  64          *
  65          * @returns nothing
  66          */
  67         function history() {
  68                 global $wgOut, $wgRequest, $wgTitle, $wgScript;
  69
  70                 /*
  71                  * Allow client caching.
  72                  */
  73                 if( $wgOut->checkLastModified( $this->mArticle->getTouched() ) )
  74                         return; // Client cache fresh and headers sent, nothing more to do.
  75
  76                 wfProfileIn( __METHOD__ );
  77
  78                 /*
  79                  * Setup page variables.
  80                  */
  81                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->mTitle->getPrefixedText() ) );
  82                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  83                 $wgOut->setArticleFlag( false );
  84                 $wgOut->setArticleRelated( true );
  85                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  86                 $wgOut->setSyndicated( true );
  87                 $wgOut->setFeedAppendQuery( 'action=history' );
  88                 $wgOut->addScriptFile( 'history.js' );
  89
  90                 $logPage = SpecialPage::getTitleFor( 'Log' );
  91                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ),
  92                         'page=' . $this->mTitle->getPrefixedUrl() );
  93                 $wgOut->setSubtitle( $logLink );
  94
  95                 $feedType = $wgRequest->getVal( 'feed' );
  96                 if( $feedType ) {
  97                         wfProfileOut( __METHOD__ );
  98                         return $this->feed( $feedType );
  99                 }
 100
 101                 /*
 102                  * Fail if article doesn't exist.
 103                  */
 104                 if( !$this->mTitle->exists() ) {
 105                         $wgOut->addWikiMsg( 'nohistory' );
 106                         wfProfileOut( __METHOD__ );
 107                         return;
 108                 }
 109
 110                 /**
 111                  * Add date selector to quickly get to a certain time
 112                  */
 113                 $year = $wgRequest->getInt( 'year' );
 114                 $month = $wgRequest->getInt( 'month' );
 115
 116                 $action = htmlspecialchars( $wgScript );
 117                 $wgOut->addHTML(
 118                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 119                         Xml::fieldset( wfMsg( 'history-fieldset-title' ), false, array( 'id' => 'mw-history-search' ) ) .
 120                         Xml::hidden( 'title', $this->mTitle->getPrefixedDBKey() ) . "\n" .
 121                         Xml::hidden( 'action', 'history' ) . "\n" .
 122                         $this->getDateMenu( $year, $month ) . '&nbsp;' .
 123                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 124                         '</fieldset></form>'
 125                 );
 126
 127                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
 128
 129                 /**
 130                  * Do the list
 131                  */
 132                 $pager = new PageHistoryPager( $this, $year, $month );
 133                 $this->linesonpage = $pager->getNumRows();
 134                 $wgOut->addHTML(
 135                         $pager->getNavigationBar() .
 136                         $this->beginHistoryList() .
 137                         $pager->getBody() .
 138                         $this->endHistoryList() .
 139                         $pager->getNavigationBar()
 140                 );
 141
 142                 wfProfileOut( __METHOD__ );
 143         }
 144
 145         /**
 146          * @return string Formatted HTML
 147          * @param int $year
 148          * @param int $month
 149          */
 150         private function getDateMenu( $year, $month ) {
 151                 # Offset overrides year/month selection
 152                 if( $month && $month !== -1 ) {
 153                         $encMonth = intval( $month );
 154                 } else {
 155                         $encMonth = '';
 156                 }
 157                 if( $year ) {
 158                         $encYear = intval( $year );
 159                 } else if( $encMonth ) {
 160                         $thisMonth = intval( gmdate( 'n' ) );
 161                         $thisYear = intval( gmdate( 'Y' ) );
 162                         if( intval($encMonth) > $thisMonth ) {
 163                                 $thisYear--;
 164                         }
 165                         $encYear = $thisYear;
 166                 } else {
 167                         $encYear = '';
 168                 }
 169                 return Xml::label( wfMsg( 'year' ), 'year' ) . ' '.
 170                         Xml::input( 'year', 4, $encYear, array('id' => 'year', 'maxlength' => 4) ) .
 171                                 ' '.
 172                         Xml::label( wfMsg( 'month' ), 'month' ) . ' '.
 173                         Xml::monthSelector( $encMonth, -1 );
 174         }
 175
 176         /**
 177          * Creates begin of history list with a submit button
 178          *
 179          * @return string HTML output
 180          */
 181         function beginHistoryList() {
 182                 global $wgTitle, $wgScript, $wgEnableHtmlDiff;
 183                 $this->lastdate = '';
 184                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 185                 $s .= Xml::openElement( 'form', array( 'action' => $wgScript, 'id' => 'mw-history-compare' ) );
 186                 $s .= Xml::hidden( 'title', $wgTitle->getPrefixedDbKey() );
 187                 if( $wgEnableHtmlDiff ) {
 188                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 189                                 array(
 190                                                 'name' => 'htmldiff',
 191                                                 'class'     => 'historysubmit',
 192                                                 'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 193                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 194                                 )
 195                         );
 196                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 197                                 array(
 198                                                 'class'     => 'historysubmit',
 199                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 200                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 201                                 )
 202                         );
 203                 } else {
 204                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 205                                 array(
 206                                                 'class'     => 'historysubmit',
 207                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 208                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 209                                 )
 210                         );
 211                 }
 212                 $s .= '<ul id="pagehistory">' . "\n";
 213                 return $s;
 214         }
 215
 216         /**
 217          * Creates end of history list with a submit button
 218          *
 219          * @return string HTML output
 220          */
 221         function endHistoryList() {
 222                 global $wgEnableHtmlDiff;
 223                 $s = '</ul>';
 224                 if( $wgEnableHtmlDiff ) {
 225                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 226                                 array(
 227                                                 'name' => 'htmldiff',
 228                                                 'class'     => 'historysubmit',
 229                                                 'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 230                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 231                                 )
 232                         );
 233                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 234                                 array(
 235                                                 'class'     => 'historysubmit',
 236                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 237                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 238                                 )
 239                         );
 240                 } else {
 241                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 242                                 array(
 243                                                 'class'     => 'historysubmit',
 244                                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 245                                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 246                                 )
 247                         );
 248                 }
 249                 $s .= '</form>';
 250                 return $s;
 251         }
 252
 253         /**
 254          * Creates a submit button
 255          *
 256          * @param array $attributes attributes
 257          * @return string HTML output for the submit button
 258          */
 259         function submitButton($message, $attributes = array() ) {
 260                 # Disable submit button if history has 1 revision only
 261                 if( $this->linesonpage > 1 ) {
 262                         return Xml::submitButton( $message , $attributes );
 263                 } else {
 264                         return '';
 265                 }
 266         }
 267
 268         /**
 269          * Returns a row from the history printout.
 270          *
 271          * @todo document some more, and maybe clean up the code (some params redundant?)
 272          *
 273          * @param Row $row The database row corresponding to the previous line.
 274          * @param mixed $next The database row corresponding to the next line.
 275          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 276          * @param $notificationtimestamp
 277          * @param bool $latest Whether this row corresponds to the page's latest revision.
 278          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 279          * @return string HTML output for the row
 280          */
 281         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 282                 global $wgUser, $wgLang;
 283                 $rev = new Revision( $row );
 284                 $rev->setTitle( $this->mTitle );
 285
 286                 $curlink = $this->curLink( $rev, $latest );
 287                 $lastlink = $this->lastLink( $rev, $next, $counter );
 288                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 289                 $link = $this->revLink( $rev );
 290
 291                 $s = "($curlink) ($lastlink) $arbitrary";
 292
 293                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 294                         if( $firstInList ) {
 295                                 // We don't currently handle well changing the top revision's settings
 296                                 $del = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.$this->message['rev-delundel'].')' );
 297                         } else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 298                                 // If revision was hidden from sysops
 299                                 $del = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.$this->message['rev-delundel'].')' );
 300                         } else {
 301                                 $query = array( 'target' => $this->mTitle->getPrefixedDbkey(),
 302                                         'oldid' => $rev->getId()
 303                                 );
 304                                 $del = $this->mSkin->revDeleteLink( $query, $rev->isDeleted( Revision::DELETED_RESTRICTED ) );
 305                         }
 306                         $s .= " $del ";
 307                 }
 308
 309                 $s .= " $link";
 310                 $s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
 311
 312                 if( $row->rev_minor_edit ) {
 313                         $s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 314                 }
 315
 316                 if( !is_null( $size = $rev->getSize() ) && $rev->userCan( Revision::DELETED_TEXT ) ) {
 317                         $s .= ' ' . $this->mSkin->formatRevisionSize( $size );
 318                 }
 319
 320                 $s .= $this->mSkin->revComment( $rev, false, true );
 321
 322                 if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
 323                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 324                 }
 325                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 326                         $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 327                 }
 328
 329                 $tools = array();
 330
 331                 if( !is_null( $next ) && is_object( $next ) ) {
 332                         if( $latest && $this->mTitle->userCan( 'rollback' ) && $this->mTitle->userCan( 'edit' ) ) {
 333                                 $tools[] = '<span class="mw-rollback-link">'.$this->mSkin->buildRollbackLink( $rev ).'</span>';
 334                         }
 335
 336                         if( $this->mTitle->quickUserCan( 'edit' ) && !$rev->isDeleted( Revision::DELETED_TEXT ) &&
 337                                 !$next->rev_deleted & Revision::DELETED_TEXT )
 338                         {
 339                                 # Create undo tooltip for the first (=latest) line only
 340                                 $undoTooltip = $latest
 341                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 342                                         : array();
 343                                 $undolink = $this->mSkin->link(
 344                                         $this->mTitle,
 345                                         wfMsgHtml( 'editundo' ),
 346                                         $undoTooltip,
 347                                         array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
 348                                         array( 'known', 'noclasses' )
 349                                 );
 350                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 351                         }
 352                 }
 353
 354                 if( $tools ) {
 355                         $s .= ' (' . implode( ' | ', $tools ) . ')';
 356                 }
 357
 358                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 359
 360                 return "<li>$s</li>\n";
 361         }
 362
 363         /**
 364          * Create a link to view this revision of the page
 365          * @param Revision $rev
 366          * @returns string
 367          */
 368         function revLink( $rev ) {
 369                 global $wgLang;
 370                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 371                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 372                         $link = $this->mSkin->makeKnownLinkObj(
 373                         $this->mTitle, $date, "oldid=" . $rev->getId() );
 374                 } else {
 375                         $link = $date;
 376                 }
 377                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 378                         return '<span class="history-deleted">' . $link . '</span>';
 379                 }
 380                 return $link;
 381         }
 382
 383         /**
 384          * Create a diff-to-current link for this revision for this page
 385          * @param Revision $rev
 386          * @param Bool $latest, this is the latest revision of the page?
 387          * @returns string
 388          */
 389         function curLink( $rev, $latest ) {
 390                 $cur = $this->message['cur'];
 391                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 392                         return $cur;
 393                 } else {
 394                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $cur,
 395                                 'diff=' . $this->mTitle->getLatestRevID() . "&oldid=" . $rev->getId() );
 396                 }
 397         }
 398
 399         /**
 400          * Create a diff-to-previous link for this revision for this page.
 401          * @param Revision $prevRev, the previous revision
 402          * @param mixed $next, the newer revision
 403          * @param int $counter, what row on the history list this is
 404          * @returns string
 405          */
 406         function lastLink( $prevRev, $next, $counter ) {
 407                 $last = $this->message['last'];
 408                 # $next may either be a Row, null, or "unkown"
 409                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 410                 if( is_null($next) ) {
 411                         # Probably no next row
 412                         return $last;
 413                 } elseif( $next === 'unknown' ) {
 414                         # Next row probably exists but is unknown, use an oldid=prev link
 415                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 416                                 "diff=" . $prevRev->getId() . "&oldid=prev" );
 417                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 418                         return $last;
 419                 } else {
 420                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 421                                 "diff=" . $prevRev->getId() . "&oldid={$next->rev_id}" );
 422                 }
 423         }
 424
 425         /**
 426          * Create radio buttons for page history
 427          *
 428          * @param object $rev Revision
 429          * @param bool $firstInList Is this version the first one?
 430          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 431          * @return string HTML output for the radio buttons
 432          */
 433         function diffButtons( $rev, $firstInList, $counter ) {
 434                 if( $this->linesonpage > 1) {
 435                         $radio = array(
 436                                 'type'  => 'radio',
 437                                 'value' => $rev->getId(),
 438                         );
 439
 440                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 441                                 $radio['disabled'] = 'disabled';
 442                         }
 443
 444                         /** @todo: move title texts to javascript */
 445                         if( $firstInList ) {
 446                                 $first = Xml::element( 'input', array_merge(
 447                                 $radio,
 448                                 array(
 449                                                 'style' => 'visibility:hidden',
 450                                                 'name'  => 'oldid' ) ) );
 451                                 $checkmark = array( 'checked' => 'checked' );
 452                         } else {
 453                                 if( $counter == 2 ) {
 454                                         $checkmark = array( 'checked' => 'checked' );
 455                                 } else {
 456                                         $checkmark = array();
 457                                 }
 458                                 $first = Xml::element( 'input', array_merge(
 459                                 $radio,
 460                                 $checkmark,
 461                                 array( 'name'  => 'oldid' ) ) );
 462                                 $checkmark = array();
 463                         }
 464                         $second = Xml::element( 'input', array_merge(
 465                         $radio,
 466                         $checkmark,
 467                         array( 'name'  => 'diff' ) ) );
 468                         return $first . $second;
 469                 } else {
 470                         return '';
 471                 }
 472         }
 473
 474         /**
 475          * Fetch an array of revisions, specified by a given limit, offset and
 476          * direction. This is now only used by the feeds. It was previously
 477          * used by the main UI but that's now handled by the pager.
 478          */
 479         function fetchRevisions($limit, $offset, $direction) {
 480                 $dbr = wfGetDB( DB_SLAVE );
 481
 482                 if( $direction == PageHistory::DIR_PREV )
 483                         list($dirs, $oper) = array("ASC", ">=");
 484                 else /* $direction == PageHistory::DIR_NEXT */
 485                         list($dirs, $oper) = array("DESC", "<=");
 486
 487                 if( $offset )
 488                         $offsets = array("rev_timestamp $oper '$offset'");
 489                 else
 490                         $offsets = array();
 491
 492                 $page_id = $this->mTitle->getArticleID();
 493
 494                 return $dbr->select( 'revision',
 495                         Revision::selectFields(),
 496                         array_merge(array("rev_page=$page_id"), $offsets),
 497                         __METHOD__,
 498                         array( 'ORDER BY' => "rev_timestamp $dirs",
 499                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 500                 );
 501         }
 502
 503         /**
 504          * Output a subscription feed listing recent edits to this page.
 505          * @param string $type
 506          */
 507         function feed( $type ) {
 508                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 509                 if( !FeedUtils::checkFeedOutput($type) ) {
 510                         return;
 511                 }
 512
 513                 $feed = new $wgFeedClasses[$type](
 514                 $this->mTitle->getPrefixedText() . ' - ' .
 515                 wfMsgForContent( 'history-feed-title' ),
 516                 wfMsgForContent( 'history-feed-description' ),
 517                 $this->mTitle->getFullUrl( 'action=history' ) );
 518
 519                 // Get a limit on number of feed entries. Provide a sane default
 520                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 521                 $limit = $wgRequest->getInt( 'limit', 10 );
 522                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 523                         $limit = 10;
 524                 }
 525                 $items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
 526
 527                 $feed->outHeader();
 528                 if( $items ) {
 529                         foreach( $items as $row ) {
 530                                 $feed->outItem( $this->feedItem( $row ) );
 531                         }
 532                 } else {
 533                         $feed->outItem( $this->feedEmpty() );
 534                 }
 535                 $feed->outFooter();
 536         }
 537
 538         function feedEmpty() {
 539                 global $wgOut;
 540                 return new FeedItem(
 541                         wfMsgForContent( 'nohistory' ),
 542                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 543                         $this->mTitle->getFullUrl(),
 544                         wfTimestamp( TS_MW ),
 545                                 '',
 546                         $this->mTitle->getTalkPage()->getFullUrl() );
 547         }
 548
 549         /**
 550          * Generate a FeedItem object from a given revision table row
 551          * Borrows Recent Changes' feed generation functions for formatting;
 552          * includes a diff to the previous revision (if any).
 553          *
 554          * @param $row
 555          * @return FeedItem
 556          */
 557         function feedItem( $row ) {
 558                 $rev = new Revision( $row );
 559                 $rev->setTitle( $this->mTitle );
 560                 $text = FeedUtils::formatDiffRow( $this->mTitle,
 561                 $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 562                 $rev->getId(),
 563                 $rev->getTimestamp(),
 564                 $rev->getComment() );
 565
 566                 if( $rev->getComment() == '' ) {
 567                         global $wgContLang;
 568                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 569                         $rev->getUserText(),
 570                         $wgContLang->timeanddate( $rev->getTimestamp() ) );
 571                 } else {
 572                         $title = $rev->getUserText() . wfMsgForContent( 'colon-separator' ) . FeedItem::stripComment( $rev->getComment() );
 573                 }
 574
 575                 return new FeedItem(
 576                         $title,
 577                         $text,
 578                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 579                         $rev->getTimestamp(),
 580                         $rev->getUserText(),
 581                         $this->mTitle->getTalkPage()->getFullUrl() );
 582         }
 583 }
 584
 585
 586 /**
 587  * @ingroup Pager
 588  */
 589 class PageHistoryPager extends ReverseChronologicalPager {
 590         public $mLastRow = false, $mPageHistory, $mTitle;
 591
 592         function __construct( $pageHistory, $year='', $month='' ) {
 593                 parent::__construct();
 594                 $this->mPageHistory = $pageHistory;
 595                 $this->mTitle =& $this->mPageHistory->mTitle;
 596                 $this->getDateCond( $year, $month );
 597         }
 598
 599         function getQueryInfo() {
 600                 $queryInfo = array(
 601                         'tables'  => array('revision'),
 602                         'fields'  => Revision::selectFields(),
 603                         'conds'   => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 604                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') )
 605                 );
 606                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 607                 return $queryInfo;
 608         }
 609
 610         function getIndexField() {
 611                 return 'rev_timestamp';
 612         }
 613
 614         function formatRow( $row ) {
 615                 if( $this->mLastRow ) {
 616                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 617                         $firstInList = $this->mCounter == 1;
 618                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 619                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 620                 } else {
 621                         $s = '';
 622                 }
 623                 $this->mLastRow = $row;
 624                 return $s;
 625         }
 626
 627         function getStartBody() {
 628                 $this->mLastRow = false;
 629                 $this->mCounter = 1;
 630                 return '';
 631         }
 632
 633         function getEndBody() {
 634                 if( $this->mLastRow ) {
 635                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 636                         $firstInList = $this->mCounter == 1;
 637                         if( $this->mIsBackwards ) {
 638                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 639                                 if( $this->mOffset == '' ) {
 640                                         $next = null;
 641                                 } else {
 642                                         $next = 'unknown';
 643                                 }
 644                         } else {
 645                                 # The next row is the past-the-end row
 646                                 $next = $this->mPastTheEndRow;
 647                         }
 648                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 649                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 650                 } else {
 651                         $s = '';
 652                 }
 653                 return $s;
 654         }
 655 }