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, $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 $wgUser, $wgScript, $wgEnableHtmlDiff;
 157                 $this->lastdate = '';
 158                 $s = wfMsgExt( 'histlegend', array( 'parse') );
 159                 if( $this->linesonpage > 1 && $wgUser->isAllowed('deleterevision') ) {
 160                         $revdel = SpecialPage::getTitleFor( 'Revisiondelete' );
 161                         $s .= Xml::openElement( 'form',
 162                                 array(
 163                                         'action' => $revdel->getLocalURL( array(
 164                                                 'type' => 'revision',
 165                                                 'target' => $this->mTitle->getPrefixedDbKey()
 166                                         ) ),
 167                                         'method' => 'post',
 168                                         'id' => 'mw-history-revdeleteform',
 169                                         'style'  => 'visibility:hidden;float:right;'
 170                                 )
 171                         );
 172                         $s .= Xml::hidden( 'ids', '', array('id'=>'revdel-oldid') );
 173                         $s .= Xml::submitButton( wfMsg( 'showhideselectedversions' ) );
 174                         $s .= Xml::closeElement( 'form' );
 175                 }
 176                 $s .= Xml::openElement( 'form', array( 'action' => $wgScript,
 177                         'id' => 'mw-history-compare' ) );
 178                 $s .= Xml::hidden( 'title', $this->mTitle->getPrefixedDbKey() );
 179                 if( $wgEnableHtmlDiff ) {
 180                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 181                                 array(
 182                                         'name' => 'htmldiff',
 183                                         'class'     => 'historysubmit',
 184                                         'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 185                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 186                                 )
 187                         );
 188                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 189                                 array(
 190                                         'class'     => 'historysubmit',
 191                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 192                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 193                                 )
 194                         );
 195                 } else {
 196                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 197                                 array(
 198                                         'class'     => 'historysubmit',
 199                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 200                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 201                                 )
 202                         );
 203                 }
 204                 $s .= '<ul id="pagehistory">' . "\n";
 205                 return $s;
 206         }
 207
 208         /**
 209          * Creates end of history list with a submit button
 210          *
 211          * @return string HTML output
 212          */
 213         function endHistoryList() {
 214                 global $wgEnableHtmlDiff;
 215                 $s = '</ul>';
 216                 if( $wgEnableHtmlDiff ) {
 217                         $s .= $this->submitButton( wfMsg( 'visualcomparison'),
 218                                 array(
 219                                         'name' => 'htmldiff',
 220                                         'class'     => 'historysubmit',
 221                                         'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 222                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 223                                 )
 224                         );
 225                         $s .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 226                                 array(
 227                                         'class'     => 'historysubmit',
 228                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 229                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 230                                 )
 231                         );
 232                 } else {
 233                         $s .= $this->submitButton( wfMsg( 'compareselectedversions'),
 234                                 array(
 235                                         'class'     => 'historysubmit',
 236                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 237                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 238                                 )
 239                         );
 240                 }
 241                 $s .= '</form>';
 242                 return $s;
 243         }
 244
 245         /**
 246          * Creates a submit button
 247          *
 248          * @param array $attributes attributes
 249          * @return string HTML output for the submit button
 250          */
 251         function submitButton($message, $attributes = array() ) {
 252                 # Disable submit button if history has 1 revision only
 253                 if( $this->linesonpage > 1 ) {
 254                         return Xml::submitButton( $message , $attributes );
 255                 } else {
 256                         return '';
 257                 }
 258         }
 259
 260         /**
 261          * Returns a row from the history printout.
 262          *
 263          * @todo document some more, and maybe clean up the code (some params redundant?)
 264          *
 265          * @param Row $row The database row corresponding to the previous line.
 266          * @param mixed $next The database row corresponding to the next line.
 267          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 268          * @param $notificationtimestamp
 269          * @param bool $latest Whether this row corresponds to the page's latest revision.
 270          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 271          * @return string HTML output for the row
 272          */
 273         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false,
 274                 $latest = false, $firstInList = false )
 275         {
 276                 global $wgUser, $wgLang;
 277                 $rev = new Revision( $row );
 278                 $rev->setTitle( $this->mTitle );
 279
 280                 $curlink = $this->curLink( $rev, $latest );
 281                 $lastlink = $this->lastLink( $rev, $next, $counter );
 282                 $arbitrary = $this->diffButtons( $rev, $firstInList, $counter );
 283                 $link = $this->revLink( $rev );
 284                 $classes = array();
 285
 286                 $s = "($curlink) ($lastlink) $arbitrary";
 287
 288                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 289                         // Hide JS by default for non-JS browsing
 290                         $hidden = array( 'style' => 'display:none' );
 291                         // If revision was hidden from sysops
 292                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 293                                 $del = Xml::check( 'deleterevisions', false,
 294                                         $hidden + array('disabled' => 'disabled') );
 295                                 $del .= Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ),
 296                                         '(' . $this->message['rev-delundel'] . ')' );
 297                         // Otherwise, show the link...
 298                         } else {
 299                                 $jsCall = 'updateShowHideForm('.$rev->getId().',this.checked)';
 300                                 $del = Xml::check( 'showhiderevisions', false,
 301                                         $hidden + array('onchange' => $jsCall) );
 302                                 $query = array(
 303                                         'type' => 'revision',
 304                                         'target' => $this->mTitle->getPrefixedDbkey(),
 305                                         'ids' => $rev->getId() );
 306                                 $del .= $this->mSkin->revDeleteLink( $query,
 307                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ) );
 308                         }
 309                         $s .= " $del ";
 310                 }
 311
 312                 $s .= " $link";
 313                 $s .= " <span class='history-user'>" . $this->mSkin->revUserTools( $rev, true ) . "</span>";
 314
 315                 if( $rev->isMinor() ) {
 316                         $s .= ' ' . Xml::element( 'span', array( 'class' => 'minor' ), wfMsg( 'minoreditletter') );
 317                 }
 318
 319                 if( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 320                         $s .= ' ' . $this->mSkin->formatRevisionSize( $size );
 321                 }
 322
 323                 $s .= $this->mSkin->revComment( $rev, false, true );
 324
 325                 if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
 326                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 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">'.
 334                                         $this->mSkin->buildRollbackLink( $rev ).'</span>';
 335                         }
 336
 337                         if( $this->mTitle->quickUserCan( 'edit' )
 338                                 && !$rev->isDeleted( Revision::DELETED_TEXT )
 339                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 340                         {
 341                                 # Create undo tooltip for the first (=latest) line only
 342                                 $undoTooltip = $latest
 343                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 344                                         : array();
 345                                 $undolink = $this->mSkin->link(
 346                                         $this->mTitle,
 347                                         wfMsgHtml( 'editundo' ),
 348                                         $undoTooltip,
 349                                         array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
 350                                         array( 'known', 'noclasses' )
 351                                 );
 352                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 353                         }
 354                 }
 355
 356                 if( $tools ) {
 357                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 358                 }
 359
 360                 # Tags
 361                 list($tagSummary, $newClasses) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 362                 $classes = array_merge( $classes, $newClasses );
 363                 $s .= " $tagSummary";
 364
 365                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 366
 367                 $classes = implode( ' ', $classes );
 368
 369                 return "<li class=\"$classes\">$s</li>\n";
 370         }
 371
 372         /**
 373          * Create a link to view this revision of the page
 374          * @param Revision $rev
 375          * @returns string
 376          */
 377         function revLink( $rev ) {
 378                 global $wgLang;
 379                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 380                 $date = htmlspecialchars( $date );
 381                 if( !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 382                         $link = $this->mSkin->makeKnownLinkObj( $this->mTitle, $date, "oldid=" . $rev->getId() );
 383                 } else {
 384                         $link = "<span class=\"history-deleted\">$date</span>";
 385                 }
 386                 return $link;
 387         }
 388
 389         /**
 390          * Create a diff-to-current link for this revision for this page
 391          * @param Revision $rev
 392          * @param Bool $latest, this is the latest revision of the page?
 393          * @returns string
 394          */
 395         function curLink( $rev, $latest ) {
 396                 $cur = $this->message['cur'];
 397                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 398                         return $cur;
 399                 } else {
 400                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $cur,
 401                                 'diff=' . $this->mTitle->getLatestRevID() . "&oldid=" . $rev->getId() );
 402                 }
 403         }
 404
 405         /**
 406          * Create a diff-to-previous link for this revision for this page.
 407          * @param Revision $prevRev, the previous revision
 408          * @param mixed $next, the newer revision
 409          * @param int $counter, what row on the history list this is
 410          * @returns string
 411          */
 412         function lastLink( $prevRev, $next, $counter ) {
 413                 $last = $this->message['last'];
 414                 # $next may either be a Row, null, or "unkown"
 415                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 416                 if( is_null($next) ) {
 417                         # Probably no next row
 418                         return $last;
 419                 } elseif( $next === 'unknown' ) {
 420                         # Next row probably exists but is unknown, use an oldid=prev link
 421                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 422                                 "diff=" . $prevRev->getId() . "&oldid=prev" );
 423                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 424                         return $last;
 425                 } else {
 426                         return $this->mSkin->makeKnownLinkObj( $this->mTitle, $last,
 427                                 "diff=" . $prevRev->getId() . "&oldid={$next->rev_id}" );
 428                 }
 429         }
 430
 431         /**
 432          * Create radio buttons for page history
 433          *
 434          * @param object $rev Revision
 435          * @param bool $firstInList Is this version the first one?
 436          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 437          * @return string HTML output for the radio buttons
 438          */
 439         function diffButtons( $rev, $firstInList, $counter ) {
 440                 if( $this->linesonpage > 1 ) {
 441                         $radio = array( 'type'  => 'radio', 'value' => $rev->getId() );
 442                         /** @todo: move title texts to javascript */
 443                         if( $firstInList ) {
 444                                 $first = Xml::element( 'input',
 445                                         array_merge( $radio, array( 'style' => 'visibility:hidden', 'name'  => 'oldid' ) )
 446                                 );
 447                                 $checkmark = array( 'checked' => 'checked' );
 448                         } else {
 449                                 # Check visibility of old revisions
 450                                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 451                                         $radio['disabled'] = 'disabled';
 452                                         $checkmark = array(); // We will check the next possible one
 453                                 } else if( $counter == 2 || !$this->mOldIdChecked ) {
 454                                         $checkmark = array( 'checked' => 'checked' );
 455                                         $this->mOldIdChecked = $rev->getId();
 456                                 } else {
 457                                         $checkmark = array();
 458                                 }
 459                                 $first = Xml::element( 'input', array_merge( $radio, $checkmark, array( 'name'  => 'oldid' ) ) );
 460                                 $checkmark = array();
 461                         }
 462                         $second = Xml::element( 'input', array_merge( $radio, $checkmark, array( 'name'  => 'diff' ) ) );
 463                         return $first . $second;
 464                 } else {
 465                         return '';
 466                 }
 467         }
 468
 469         /**
 470          * Fetch an array of revisions, specified by a given limit, offset and
 471          * direction. This is now only used by the feeds. It was previously
 472          * used by the main UI but that's now handled by the pager.
 473          */
 474         function fetchRevisions($limit, $offset, $direction) {
 475                 $dbr = wfGetDB( DB_SLAVE );
 476
 477                 if( $direction == PageHistory::DIR_PREV )
 478                         list($dirs, $oper) = array("ASC", ">=");
 479                 else /* $direction == PageHistory::DIR_NEXT */
 480                         list($dirs, $oper) = array("DESC", "<=");
 481
 482                 if( $offset )
 483                         $offsets = array("rev_timestamp $oper '$offset'");
 484                 else
 485                         $offsets = array();
 486
 487                 $page_id = $this->mTitle->getArticleID();
 488
 489                 return $dbr->select( 'revision',
 490                         Revision::selectFields(),
 491                         array_merge(array("rev_page=$page_id"), $offsets),
 492                         __METHOD__,
 493                         array( 'ORDER BY' => "rev_timestamp $dirs",
 494                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 495                 );
 496         }
 497
 498         /**
 499          * Output a subscription feed listing recent edits to this page.
 500          * @param string $type
 501          */
 502         function feed( $type ) {
 503                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 504                 if( !FeedUtils::checkFeedOutput($type) ) {
 505                         return;
 506                 }
 507
 508                 $feed = new $wgFeedClasses[$type](
 509                 $this->mTitle->getPrefixedText() . ' - ' .
 510                 wfMsgForContent( 'history-feed-title' ),
 511                 wfMsgForContent( 'history-feed-description' ),
 512                 $this->mTitle->getFullUrl( 'action=history' ) );
 513
 514                 // Get a limit on number of feed entries. Provide a sane default
 515                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 516                 $limit = $wgRequest->getInt( 'limit', 10 );
 517                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 518                         $limit = 10;
 519                 }
 520                 $items = $this->fetchRevisions($limit, 0, PageHistory::DIR_NEXT);
 521
 522                 $feed->outHeader();
 523                 if( $items ) {
 524                         foreach( $items as $row ) {
 525                                 $feed->outItem( $this->feedItem( $row ) );
 526                         }
 527                 } else {
 528                         $feed->outItem( $this->feedEmpty() );
 529                 }
 530                 $feed->outFooter();
 531         }
 532
 533         function feedEmpty() {
 534                 global $wgOut;
 535                 return new FeedItem(
 536                         wfMsgForContent( 'nohistory' ),
 537                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 538                         $this->mTitle->getFullUrl(),
 539                         wfTimestamp( TS_MW ),
 540                                 '',
 541                         $this->mTitle->getTalkPage()->getFullUrl() );
 542         }
 543
 544         /**
 545          * Generate a FeedItem object from a given revision table row
 546          * Borrows Recent Changes' feed generation functions for formatting;
 547          * includes a diff to the previous revision (if any).
 548          *
 549          * @param $row
 550          * @return FeedItem
 551          */
 552         function feedItem( $row ) {
 553                 $rev = new Revision( $row );
 554                 $rev->setTitle( $this->mTitle );
 555                 $text = FeedUtils::formatDiffRow( $this->mTitle,
 556                 $this->mTitle->getPreviousRevisionID( $rev->getId() ),
 557                 $rev->getId(),
 558                 $rev->getTimestamp(),
 559                 $rev->getComment() );
 560
 561                 if( $rev->getComment() == '' ) {
 562                         global $wgContLang;
 563                         $ts = $rev->getTimestamp();
 564                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 565                                 $rev->getUserText(),
 566                                 $wgContLang->timeanddate( $ts ),
 567                                 $wgContLang->date( $ts ),
 568                                 $wgContLang->time( $ts ) );
 569                 } else {
 570                         $title = $rev->getUserText() . wfMsgForContent( 'colon-separator' ) . FeedItem::stripComment( $rev->getComment() );
 571                 }
 572
 573                 return new FeedItem(
 574                         $title,
 575                         $text,
 576                         $this->mTitle->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 577                         $rev->getTimestamp(),
 578                         $rev->getUserText(),
 579                         $this->mTitle->getTalkPage()->getFullUrl() );
 580         }
 581 }
 582
 583
 584 /**
 585  * @ingroup Pager
 586  */
 587 class PageHistoryPager extends ReverseChronologicalPager {
 588         public $mLastRow = false, $mPageHistory, $mTitle;
 589
 590         function __construct( $pageHistory, $year='', $month='', $tagFilter = '' ) {
 591                 parent::__construct();
 592                 $this->mPageHistory = $pageHistory;
 593                 $this->mTitle =& $this->mPageHistory->mTitle;
 594                 $this->tagFilter = $tagFilter;
 595                 $this->getDateCond( $year, $month );
 596         }
 597
 598         function getQueryInfo() {
 599                 $queryInfo = array(
 600                         'tables'  => array('revision'),
 601                         'fields'  => array_merge( Revision::selectFields(), array('ts_tags') ),
 602                         'conds'   => array('rev_page' => $this->mPageHistory->mTitle->getArticleID() ),
 603                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') ),
 604                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 605                 );
 606                 ChangeTags::modifyDisplayQuery( $queryInfo['tables'],
 607                                                                                 $queryInfo['fields'],
 608                                                                                 $queryInfo['conds'],
 609                                                                                 $queryInfo['join_conds'],
 610                                                                                 $queryInfo['options'],
 611                                                                                 $this->tagFilter );
 612                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 613                 return $queryInfo;
 614         }
 615
 616         function getIndexField() {
 617                 return 'rev_timestamp';
 618         }
 619
 620         function formatRow( $row ) {
 621                 if( $this->mLastRow ) {
 622                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 623                         $firstInList = $this->mCounter == 1;
 624                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $row, $this->mCounter++,
 625                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 626                 } else {
 627                         $s = '';
 628                 }
 629                 $this->mLastRow = $row;
 630                 return $s;
 631         }
 632
 633         function getStartBody() {
 634                 $this->mLastRow = false;
 635                 $this->mCounter = 1;
 636                 return '';
 637         }
 638
 639         function getEndBody() {
 640                 if( $this->mLastRow ) {
 641                         $latest = $this->mCounter == 1 && $this->mIsFirst;
 642                         $firstInList = $this->mCounter == 1;
 643                         if( $this->mIsBackwards ) {
 644                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 645                                 if( $this->mOffset == '' ) {
 646                                         $next = null;
 647                                 } else {
 648                                         $next = 'unknown';
 649                                 }
 650                         } else {
 651                                 # The next row is the past-the-end row
 652                                 $next = $this->mPastTheEndRow;
 653                         }
 654                         $s = $this->mPageHistory->historyLine( $this->mLastRow, $next, $this->mCounter++,
 655                                 $this->mTitle->getNotificationTimestamp(), $latest, $firstInList );
 656                 } else {
 657                         $s = '';
 658                 }
 659                 return $s;
 660         }
 661 }