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 $mNotificationTimestamp;
  26         var $mLatestId = null;
  27
  28         /**
  29          * Construct a new PageHistory.
  30          *
  31          * @param Article $article
  32          * @returns nothing
  33          */
  34         function __construct($article) {
  35                 global $wgUser;
  36
  37                 $this->mArticle =& $article;
  38                 $this->mTitle =& $article->mTitle;
  39                 $this->mNotificationTimestamp = NULL;
  40                 $this->mSkin = $wgUser->getSkin();
  41                 $this->preCacheMessages();
  42         }
  43
  44         function getArticle() {
  45                 return $this->mArticle;
  46         }
  47
  48         function getTitle() {
  49                 return $this->mTitle;
  50         }
  51
  52         /**
  53          * As we use the same small set of messages in various methods and that
  54          * they are called often, we call them once and save them in $this->message
  55          */
  56         function preCacheMessages() {
  57                 // Precache various messages
  58                 if( !isset( $this->message ) ) {
  59                         foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
  60                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
  61                         }
  62                 }
  63         }
  64
  65         /**
  66          * Print the history page for an article.
  67          *
  68          * @returns nothing
  69          */
  70         function history() {
  71                 global $wgOut, $wgRequest, $wgTitle, $wgScript;
  72
  73                 /*
  74                  * Allow client caching.
  75                  */
  76                 if( $wgOut->checkLastModified( $this->mArticle->getTouched() ) )
  77                         /* Client cache fresh and headers sent, nothing more to do. */
  78                         return;
  79
  80                 wfProfileIn( __METHOD__ );
  81
  82                 /*
  83                  * Setup page variables.
  84                  */
  85                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->mTitle->getPrefixedText() ) );
  86                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  87                 $wgOut->setArticleFlag( false );
  88                 $wgOut->setArticleRelated( true );
  89                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  90                 $wgOut->setSyndicated( true );
  91                 $wgOut->setFeedAppendQuery( 'action=history' );
  92                 $wgOut->addScriptFile( 'history.js' );
  93
  94                 $logPage = SpecialPage::getTitleFor( 'Log' );
  95                 $logLink = $this->mSkin->makeKnownLinkObj( $logPage, wfMsgHtml( 'viewpagelogs' ), 'page=' . $this->mTitle->getPrefixedUrl() );
  96                 $wgOut->setSubtitle( $logLink );
  97
  98                 $feedType = $wgRequest->getVal( 'feed' );
  99                 if( $feedType ) {
 100                         wfProfileOut( __METHOD__ );
 101                         return $this->feed( $feedType );
 102                 }
 103
 104                 /*
 105                  * Fail if article doesn't exist.
 106                  */
 107                 if( !$this->mTitle->exists() ) {
 108                         $wgOut->addWikiMsg( 'nohistory' );
 109                         wfProfileOut( __METHOD__ );
 110                         return;
 111                 }
 112
 113                 /*
 114                  * "go=first" means to jump to the last (earliest) history page.
 115                  * This is deprecated, it no longer appears in the user interface
 116                  */
 117                 if ( $wgRequest->getText("go") == 'first' ) {
 118                         $limit = $wgRequest->getInt( 'limit', 50 );
 119                         global $wgFeedLimit;
 120                         if( $limit > $wgFeedLimit ) {
 121                                 $limit = $wgFeedLimit;
 122                         }
 123                         $wgOut->redirect( $wgTitle->getLocalURL( "action=history&limit={$limit}&dir=prev" ) );
 124                         return;
 125                 }
 126
 127                 /**
 128                  * Add date selector to quickly get to a certain time
 129                  */
 130                 $year = $wgRequest->getInt( 'year' );
 131                 $month = $wgRequest->getInt( 'month' );
 132
 133                 $action = htmlspecialchars( $wgScript );
 134                 $wgOut->addHTML(
 135                         "<form action=\"$action\" method=\"get\"><div>" .
 136                         Xml::hidden( 'title', $this->mTitle->getPrefixedDBKey() ) . "\n" .
 137                         Xml::hidden( 'action', 'history' ) . "\n" .
 138                         $this->getDateMenu( $year, $month ) . '&nbsp;' .
 139                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 140                         '</div><hr/></form>'
 141                 );
 142
 143                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->mArticle ) );
 144
 145                 /**
 146                  * Do the list
 147                  */
 148                 $pager = new PageHistoryPager( $this, $year, $month );
 149                 $this->linesonpage = $pager->getNumRows();
 150                 $wgOut->addHTML(
 151                         $pager->getNavigationBar() .
 152                         $this->beginHistoryList() .
 153                         $pager->getBody() .
 154                         $this->endHistoryList() .
 155                         $pager->getNavigationBar()
 156                 );
 157                 wfProfileOut( __METHOD__ );
 158         }
 159
 160         /**
 161          * @return string Formatted HTML
 162          * @param int $year
 163          * @param int $month
 164          */
 165         private function getDateMenu( $year, $month ) {
 166                 # Offset overrides year/month selection
 167                 if( $month && $month !== -1 ) {
 168                         $encMonth = intval( $month );
 169                 } else {
 170                         $encMonth = '';
 171                 }
 172                 if ( $year ) {
 173                         $encYear = intval( $year );
 174                 } else if( $encMonth ) {
 175                         $thisMonth = intval( gmdate( 'n' ) );
 176                         $thisYear = intval( gmdate( 'Y' ) );
 177                         if( intval($encMonth) > $thisMonth ) {
 178                                 $thisYear--;
 179                         }
 180                         $encYear = $thisYear;
 181                 } else {
 182                         $encYear = '';
 183                 }
 184                 return Xml::label( wfMsg( 'year' ), 'year' ) . ' '.
 185                         Xml::input( 'year', 4, $encYear, array('id' => 'year', 'maxlength' => 4) ) .
 186                         ' '.
 187                         Xml::label( wfMsg( 'month' ), 'month' ) . ' '.
 188                         Xml::monthSelector( $encMonth, -1 );
 189         }
 190
 191         /**
 192          * Creates begin of history list with a submit button
 193          *
 194          * @return string HTML output
 195          */
 196         function beginHistoryList() {
 197                 global $wgTitle, $wgScript;
 198                 $this->lastdate = '';
 199                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 200                 $s .= Xml::openElement( 'form', array( 'action' => $wgScript ) );
 201                 $s .= Xml::hidden( 'title', $wgTitle->getPrefixedDbKey() );
 202                 $s .= $this->submitButton();
 203                 $s .= '<ul id="pagehistory">' . "\n";
 204                 return $s;
 205         }
 206
 207         /**
 208          * Creates end of history list with a submit button
 209          *
 210          * @return string HTML output
 211          */
 212         function endHistoryList() {
 213                 $s = '</ul>';
 214                 $s .= $this->submitButton( array( 'id' => 'historysubmit' ) );
 215                 $s .= '</form>';
 216                 return $s;
 217         }
 218
 219         /**
 220          * Creates a submit button
 221          *
 222          * @param array $bits optional CSS ID
 223          * @return string HTML output for the submit button
 224          */
 225         function submitButton( $bits = array() ) {
 226                 # Disable submit button if history has 1 revision only
 227                 if ( $this->linesonpage > 1 ) {
 228                         return Xml::submitButton( wfMsg( 'compareselectedversions' ),
 229                                 $bits + array(
 230                                         'class'     => 'historysubmit',
 231                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 232                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 233                                         )
 234                                 );
 235                 } else {
 236                         return '';
 237                 }
 238         }
 239
 240         /**
 241          * Returns a row from the history printout.
 242          *
 243          * @todo document some more, and maybe clean up the code (some params redundant?)
 244          *
 245          * @param Row $row The database row corresponding to the previous line.
 246          * @param mixed $next The database row corresponding to the next line.
 247          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 248          * @param $notificationtimestamp
 249          * @param bool $latest Whether this row corresponds to the page's latest revision.
 250          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 251          * @return string HTML output for the row
 252          */
 253         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false, $latest = false, $firstInList = false ) {
 254                 global $wgUser, $wgLang;
 255                 $rev = new Revision( $row );
 256                 $rev->setTitle( $this->mTitle );
 257
 258                 $s = '';
 259                 $curlink = $this->curLink( $rev, $latest );
 260                 $lastlink = $this->lastLink( $rev, $next, $counter );
 261                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 262                 $link = $this->revLink( $rev );
 263
 264                 $s .= "($curlink) ($lastlink) $arbitrary";
 265
 266                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 267                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 268                         if( $firstInList ) {
 269                         // We don't currently handle well changing the top revision's settings
 270                                 $del = $this->message['rev-delundel'];
 271                         } else if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 272                         // If revision was hidden from sysops
 273                                 $del = $this->message['rev-delundel'];
 274                         } else {
 275                                 $del = $this->mSkin->makeKnownLinkObj( $revdel,
 276                                         $this->message['rev-delundel'],
 277                                         'target=' . urlencode( $this->mTitle->getPrefixedDbkey() ) .
 278                                         '&oldid=' . urlencode( $rev->getId() ) );
 279                                 // Bolden oversighted content
 280                                 if( $rev->isDeleted( Revision::DELETED_RESTRICTED ) )
 281                                         $del = "<strong>$del</strong>";
 282                         }
 283                         $s .= " <tt>(<small>$del</small>)</tt> ";
 284                 }
 285
 286                 $s .= " $link";
 287                 $s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
 288
 289                 if( $row->rev_minor_edit ) {
 290                         $s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 291                 }
 292
 293                 if ( !is_null( $size = $rev->getSize() ) && $rev->userCan( Revision::DELETED_TEXT ) ) {
 294                         $s .= ' ' . $this->mSkin->formatRevisionSize( $size );
 295                 }
 296
 297                 $s .= $this->mSkin->revComment( $rev, false, true );
 298
 299                 if ($notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp)) {
 300                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 301                 }
 302                 #add blurb about text having been deleted
 303                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 304                         $s .= ' <tt>' . wfMsgHtml( 'deletedrev' ) . '</tt>';
 305                 }
 306
 307                 $tools = array();
 308
 309                 if ( !is_null( $next ) && is_object( $next ) ) {
 310                         if( !$this->mTitle->getUserPermissionsErrors( 'rollback', $wgUser )
 311                         && !$this->mTitle->getUserPermissionsErrors( 'edit', $wgUser )
 312                         && $latest ) {
 313                                 $tools[] = '<span class="mw-rollback-link">'
 314                                         . $this->mSkin->buildRollbackLink( $rev )
 315                                         . '</span>';
 316                         }
 317
 318                         if( $this->mTitle->quickUserCan( 'edit' ) &&
 319                                 !$rev->isDeleted( Revision::DELETED_TEXT ) &&
 320                                 !$next->rev_deleted & Revision::DELETED_TEXT ) {
 321                                 $undolink = $this->mSkin->makeKnownLinkObj(
 322                                         $this->mTitle,
 323                                         wfMsgHtml( 'editundo' ),
 324                                         'action=edit&undoafter=' . $next->rev_id . '&undo=' . $rev->getId()
 325                                 );
 326                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 327                         }
 328                 }
 329
 330                 if( $tools ) {
 331                         $s .= ' (' . implode( ' | ', $tools ) . ')';
 332                 }
 333
 334                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 335
 336                 return "<li>$s</li>\n";
 337         }
 338
 339         /**
 340         * Create a link to view this revision of the page
 341         * @param Revision $rev
 342         * @returns string
 343         */
 344         function revLink( $rev ) {
 345                 global $wgLang;
 346                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 347                 if( $rev->userCan( Revision::DELETED_TEXT ) ) {
 348                         $link = $this->mSkin->makeKnownLinkObj(
 349                                 $this->mTitle, $date, "oldid=" . $rev->getId() );
 350                 } else {
 351                         $link = $date;
 352                 }
 353                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 354                         return '<span class="history-deleted">' . $link . '</span>';
 355                 }
 356                 return $link;
 357         }
 358
 359         /**
 360         * Create a diff-to-current link for this revision for this page
 361         * @param Revision $rev
 362         * @param Bool $latest, this is the latest revision of the page?
 363         * @returns string
 364         */
 365         function curLink( $rev, $latest ) {
 366                 $cur = $this->message['cur'];
 367                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 368                         return $cur;
 369                 } else {
 370                         return $this->mSkin->makeKnownLinkObj(
 371                                 $this->mTitle, $cur,
 372                                 'diff=' . $this->getLatestID() .
 373                                 "&oldid=" . $rev->getId() );
 374                 }
 375         }
 376
 377         /**
 378         * Create a diff-to-previous link for this revision for this page.
 379         * @param Revision $prevRev, the previous revision
 380         * @param mixed $next, the newer revision
 381         * @param int $counter, what row on the history list this is
 382         * @returns string
 383         */
 384         function lastLink( $prevRev, $next, $counter ) {
 385                 $last = $this->message['last'];
 386                 # $next may either be a Row, null, or "unkown"
 387                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 388                 if( is_null($next) ) {
 389                         # Probably no next row
 390                         return $last;
 391                 } elseif( $next === 'unknown' ) {
 392                         # Next row probably exists but is unknown, use an oldid=prev link
 393                         return $this->mSkin->makeKnownLinkObj(
 394                                 $this->mTitle,
 395                                 $last,
 396                                 "diff=" . $prevRev->getId() . "&oldid=prev" );
 397                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 398                         return $last;
 399                 } else {
 400                         return $this->mSkin->makeKnownLinkObj(
 401                                 $this->mTitle,
 402                                 $last,
 403                                 "diff=" . $prevRev->getId() . "&oldid={$next->rev_id}"
 404                                 /*,
 405                                 '',
 406                                 '',
 407                                 "tabindex={$counter}"*/ );
 408                 }
 409         }
 410
 411         /**
 412          * Create radio buttons for page history
 413          *
 414          * @param object $rev Revision
 415          * @param bool $firstInList Is this version the first one?
 416          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 417          * @return string HTML output for the radio buttons
 418          */
 419         function diffButtons( $rev, $firstInList, $counter ) {
 420                 if( $this->linesonpage > 1) {
 421                         $radio = array(
 422                                 'type'  => 'radio',
 423                                 'value' => $rev->getId(),
 424                         );
 425
 426                         if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 427                                 $radio['disabled'] = 'disabled';
 428                         }
 429
 430                         /** @todo: move title texts to javascript */
 431                         if ( $firstInList ) {
 432                                 $first = Xml::element( 'input', array_merge(
 433                                         $radio,
 434                                         array(
 435                                                 'style' => 'visibility:hidden',
 436                                                 'name'  => 'oldid' ) ) );
 437                                 $checkmark = array( 'checked' => 'checked' );
 438                         } else {
 439                                 if( $counter == 2 ) {
 440                                         $checkmark = array( 'checked' => 'checked' );
 441                                 } else {
 442                                         $checkmark = array();
 443                                 }
 444                                 $first = Xml::element( 'input', array_merge(
 445                                         $radio,
 446                                         $checkmark,
 447                                         array( 'name'  => 'oldid' ) ) );
 448                                 $checkmark = array();
 449                         }
 450                         $second = Xml::element( 'input', array_merge(
 451                                 $radio,
 452                                 $checkmark,
 453                                 array( 'name'  => 'diff' ) ) );
 454                         return $first . $second;
 455                 } else {
 456                         return '';
 457                 }
 458         }
 459
 460         /** @todo document */
 461         function getLatestId() {
 462                 if( is_null( $this->mLatestId ) ) {
 463                         $id = $this->mTitle->getArticleID();
 464                         $db = wfGetDB( DB_SLAVE );
 465                         $this->mLatestId = $db->selectField( 'page',
 466                                 "page_latest",
 467                                 array( 'page_id' => $id ),
 468                                 __METHOD__ );
 469                 }
 470                 return $this->mLatestId;
 471         }
 472
 473         /**
 474          * Fetch an array of revisions, specified by a given limit, offset and
 475          * direction. This is now only used by the feeds. It was previously
 476          * used by the main UI but that's now handled by the pager.
 477          */
 478         function fetchRevisions($limit, $offset, $direction) {
 479                 $dbr = wfGetDB( DB_SLAVE );
 480
 481                 if ($direction == PageHistory::DIR_PREV)
 482                         list($dirs, $oper) = array("ASC", ">=");
 483                 else /* $direction == PageHistory::DIR_NEXT */
 484                         list($dirs, $oper) = array("DESC", "<=");
 485
 486                 if ($offset)
 487                         $offsets = array("rev_timestamp $oper '$offset'");
 488                 else
 489                         $offsets = array();
 490
 491                 $page_id = $this->mTitle->getArticleID();
 492
 493                 return $dbr->select(
 494                         'revision',
 495                         Revision::selectFields(),
 496                         array_merge(array("rev_page=$page_id"), $offsets),
 497                         __METHOD__,
 498                         array('ORDER BY' => "rev_timestamp $dirs",
 499                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 500                 );
 501         }
 502
 503         /** @todo document */
 504         function getNotificationTimestamp() {
 505                 global $wgUser, $wgShowUpdatedMarker;
 506
 507                 if ($this->mNotificationTimestamp !== NULL)
 508                         return $this->mNotificationTimestamp;
 509
 510                 if ($wgUser->isAnon() || !$wgShowUpdatedMarker)
 511                         return $this->mNotificationTimestamp = false;
 512
 513                 $dbr = wfGetDB(DB_SLAVE);
 514
 515                 $this->mNotificationTimestamp = $dbr->selectField(
 516                         'watchlist',
 517                         'wl_notificationtimestamp',
 518                         array(  'wl_namespace' => $this->mTitle->getNamespace(),
 519                                 'wl_title' => $this->mTitle->getDBkey(),
 520                                 'wl_user' => $wgUser->getId()
 521                         ),
 522                         __METHOD__ );
 523
 524                 // Don't use the special value reserved for telling whether the field is filled
 525                 if ( is_null( $this->mNotificationTimestamp ) ) {
 526                         $this->mNotificationTimestamp = false;
 527                 }
 528
 529                 return $this->mNotificationTimestamp;
 530         }
 531
 532         /**
 533          * Output a subscription feed listing recent edits to this page.
 534          * @param string $type
 535          */
 536         function feed( $type ) {
 537                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 538                 if ( !FeedUtils::checkFeedOutput($type) ) {
 539                         return;
 540                 }
 541
 542                 $feed = new $wgFeedClasses[$type](
 543                         $this->mTitle->getPrefixedText() . ' - ' .
 544                                 wfMsgForContent( 'history-feed-title' ),
 545                         wfMsgForContent( 'history-feed-description' ),
 546                         $this->mTitle->getFullUrl( 'action=history' ) );
 547
 548                 // Get a limit on number of feed entries. Provide a sane default
 549                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 550                 $limit = $wgRequest->getInt( 'limit', 10 );
 551                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 552                         $limit = 10;
 553                 }
 554                 $items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
 555
 556                 $feed->outHeader();
 557                 if( $items ) {
 558                         foreach( $items as $row ) {
 559                                 $feed->outItem( $this->feedItem( $row ) );
 560                         }
 561                 } else {
 562                         $feed->outItem( $this->feedEmpty() );
 563                 }
 564                 $feed->outFooter();
 565         }
 566
 567         function feedEmpty() {
 568                 global $wgOut;
 569                 return new FeedItem(
 570                         wfMsgForContent( 'nohistory' ),
 571                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 572                         $this->mTitle->getFullUrl(),
 573                         wfTimestamp( TS_MW ),
 574                         '',
 575                         $this->mTitle->getTalkPage()->getFullUrl() );
 576         }
 577
 578         /**
 579          * Generate a FeedItem object from a given revision table row
 580          * Borrows Recent Changes' feed generation functions for formatting;
 581          * includes a diff to the previous revision (if any).
 582          *
 583          * @param $row
 584          * @return FeedItem
 585          */
 586         function feedItem( $row ) {
 587                 $rev = new Revision( $row );
 588                 $rev->setTitle( $this->mTitle );
 589                 $text = FeedUtils::formatDiffRow( $this->mTitle,
 590                         $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 591                         $rev->getId(),
 592                         $rev->getTimestamp(),
 593                         $rev->getComment() );
 594
 595                 if( $rev->getComment() == '' ) {
 596                         global $wgContLang;
 597                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 598                                 $rev->getUserText(),
 599                                 $wgContLang->timeanddate( $rev->getTimestamp() ) );
 600                 } else {
 601                         $title = $rev->getUserText() . ": " . $this->stripComment( $rev->getComment() );
 602                 }
 603
 604                 return new FeedItem(
 605                         $title,
 606                         $text,
 607                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 608                         $rev->getTimestamp(),
 609                         $rev->getUserText(),
 610                         $this->mTitle->getTalkPage()->getFullUrl() );
 611         }
 612
 613         /**
 614          * Quickie hack... strip out wikilinks to more legible form from the comment.
 615          */
 616         function stripComment( $text ) {
 617                 return preg_replace( '/\[\[([^]]*\|)?([^]]+)\]\]/', '\2', $text );
 618         }
 619 }
 620
 621
 622 /**
 623  * @ingroup Pager
 624  */
 625 class PageHistoryPager extends ReverseChronologicalPager {
 626         public $mLastRow = false, $mPageHistory;
 627
 628         function __construct( $pageHistory, $year='', $month='' ) {
 629                 parent::__construct();
 630                 $this->mPageHistory = $pageHistory;
 631                 $this->getDateCond( $year, $month );
 632         }
 633
 634         function getQueryInfo() {
 635                 $queryInfo = array(
 636                         'tables'  => array('revision'),
 637                         'fields'  => Revision::selectFields(),
 638                         'conds'   => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 639                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') )
 640                 );
 641                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 642                 return $queryInfo;
 643         }
 644
 645         function getIndexField() {
 646                 return 'rev_timestamp';
 647         }
 648
 649         function formatRow( $row ) {
 650                 if ( $this->mLastRow ) {
 651                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 652                         $firstInList = $this->mCounter == 1;
 653                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 654                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 655                 } else {
 656                         $s = '';
 657                 }
 658                 $this->mLastRow = $row;
 659                 return $s;
 660         }
 661
 662         function getStartBody() {
 663                 $this->mLastRow = false;
 664                 $this->mCounter = 1;
 665                 return '';
 666         }
 667
 668         function getEndBody() {
 669                 if ( $this->mLastRow ) {
 670                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 671                         $firstInList = $this->mCounter == 1;
 672                         if ( $this->mIsBackwards ) {
 673                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 674                                 if ( $this->mOffset == '' ) {
 675                                         $next = null;
 676                                 } else {
 677                                         $next = 'unknown';
 678                                 }
 679                         } else {
 680                                 # The next row is the past-the-end row
 681                                 $next = $this->mPastTheEndRow;
 682                         }
 683                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 684                                 $this->mPageHistory->getNotificationTimestamp(), $latest, $firstInList );
 685                 } else {
 686                         $s = '';
 687                 }
 688                 return $s;
 689         }
 690 }