includes/HistoryPage.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 HistoryPage {
  19         const DIR_PREV = 0;
  20         const DIR_NEXT = 1;
  21
  22         var $article, $title, $skin;
  23
  24         /**
  25          * Construct a new HistoryPage.
  26          *
  27          * @param Article $article
  28          * @returns nothing
  29          */
  30         function __construct( $article ) {
  31                 global $wgUser;
  32                 $this->article = $article;
  33                 $this->title = $article->getTitle();
  34                 $this->skin = $wgUser->getSkin();
  35                 $this->preCacheMessages();
  36         }
  37
  38         function getArticle() {
  39                 return $this->article;
  40         }
  41
  42         function getTitle() {
  43                 return $this->title;
  44         }
  45
  46         /**
  47          * As we use the same small set of messages in various methods and that
  48          * they are called often, we call them once and save them in $this->message
  49          */
  50         function preCacheMessages() {
  51                 // Precache various messages
  52                 if( !isset( $this->message ) ) {
  53                         foreach( explode(' ', 'cur last rev-delundel' ) as $msg ) {
  54                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escape') );
  55                         }
  56                 }
  57         }
  58
  59         /**
  60          * Print the history page for an article.
  61          *
  62          * @returns nothing
  63          */
  64         function history() {
  65                 global $wgOut, $wgRequest, $wgScript;
  66
  67                 /*
  68                  * Allow client caching.
  69                  */
  70                 if( $wgOut->checkLastModified( $this->article->getTouched() ) )
  71                         return; // Client cache fresh and headers sent, nothing more to do.
  72
  73                 wfProfileIn( __METHOD__ );
  74
  75                 /*
  76                  * Setup page variables.
  77                  */
  78                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
  79                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  80                 $wgOut->setArticleFlag( false );
  81                 $wgOut->setArticleRelated( true );
  82                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  83                 $wgOut->setSyndicated( true );
  84                 $wgOut->setFeedAppendQuery( 'action=history' );
  85                 $wgOut->addScriptFile( 'history.js' );
  86
  87                 $logPage = SpecialPage::getTitleFor( 'Log' );
  88                 $logLink = $this->skin->link(
  89                         $logPage,
  90                         wfMsgHtml( 'viewpagelogs' ),
  91                         array(),
  92                         array( 'page' => $this->title->getPrefixedText() ),
  93                         array( 'known', 'noclasses' )
  94                 );
  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->title->exists() ) {
 107                         $wgOut->addWikiMsg( 'nohistory' );
 108                         $this->article->showLogs(); // show deletion/move log if there is an entry
 109                         wfProfileOut( __METHOD__ );
 110                         return;
 111                 }
 112
 113                 /**
 114                  * Add date selector to quickly get to a certain time
 115                  */
 116                 $year = $wgRequest->getInt( 'year' );
 117                 $month = $wgRequest->getInt( 'month' );
 118                 $tagFilter = $wgRequest->getVal( 'tagfilter' );
 119                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 120
 121                 $action = htmlspecialchars( $wgScript );
 122                 $wgOut->addHTML(
 123                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 124                         Xml::fieldset( wfMsg( 'history-fieldset-title' ), false, array( 'id' => 'mw-history-search' ) ) .
 125                         Xml::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
 126                         Xml::hidden( 'action', 'history' ) . "\n" .
 127                         xml::dateMenu( $year, $month ) . '&nbsp;' .
 128                         ( $tagSelector ? ( implode( '&nbsp;', $tagSelector ) . '&nbsp;' ) : '' ) .
 129                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 130                         '</fieldset></form>'
 131                 );
 132
 133                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
 134
 135                 /**
 136                  * Do the list
 137                  */
 138                 $pager = new HistoryPager( $this, $year, $month, $tagFilter );
 139                 $wgOut->addHTML(
 140                         $pager->getNavigationBar() .
 141                         $pager->getBody() .
 142                         $pager->getNavigationBar()
 143                 );
 144
 145                 wfProfileOut( __METHOD__ );
 146         }
 147
 148         /**
 149          * Fetch an array of revisions, specified by a given limit, offset and
 150          * direction. This is now only used by the feeds. It was previously
 151          * used by the main UI but that's now handled by the pager.
 152          */
 153         function fetchRevisions($limit, $offset, $direction) {
 154                 $dbr = wfGetDB( DB_SLAVE );
 155
 156                 if( $direction == HistoryPage::DIR_PREV )
 157                         list($dirs, $oper) = array("ASC", ">=");
 158                 else /* $direction == HistoryPage::DIR_NEXT */
 159                         list($dirs, $oper) = array("DESC", "<=");
 160
 161                 if( $offset )
 162                         $offsets = array("rev_timestamp $oper '$offset'");
 163                 else
 164                         $offsets = array();
 165
 166                 $page_id = $this->title->getArticleID();
 167
 168                 return $dbr->select( 'revision',
 169                         Revision::selectFields(),
 170                         array_merge(array("rev_page=$page_id"), $offsets),
 171                         __METHOD__,
 172                         array( 'ORDER BY' => "rev_timestamp $dirs",
 173                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 174                 );
 175         }
 176
 177         /**
 178          * Output a subscription feed listing recent edits to this page.
 179          * @param string $type
 180          */
 181         function feed( $type ) {
 182                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 183                 if( !FeedUtils::checkFeedOutput($type) ) {
 184                         return;
 185                 }
 186
 187                 $feed = new $wgFeedClasses[$type](
 188                 $this->title->getPrefixedText() . ' - ' .
 189                 wfMsgForContent( 'history-feed-title' ),
 190                 wfMsgForContent( 'history-feed-description' ),
 191                 $this->title->getFullUrl( 'action=history' ) );
 192
 193                 // Get a limit on number of feed entries. Provide a sane default
 194                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 195                 $limit = $wgRequest->getInt( 'limit', 10 );
 196                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 197                         $limit = 10;
 198                 }
 199                 $items = $this->fetchRevisions($limit, 0, HistoryPage::DIR_NEXT);
 200
 201                 $feed->outHeader();
 202                 if( $items ) {
 203                         foreach( $items as $row ) {
 204                                 $feed->outItem( $this->feedItem( $row ) );
 205                         }
 206                 } else {
 207                         $feed->outItem( $this->feedEmpty() );
 208                 }
 209                 $feed->outFooter();
 210         }
 211
 212         function feedEmpty() {
 213                 global $wgOut;
 214                 return new FeedItem(
 215                         wfMsgForContent( 'nohistory' ),
 216                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 217                         $this->title->getFullUrl(),
 218                         wfTimestamp( TS_MW ),
 219                                 '',
 220                         $this->title->getTalkPage()->getFullUrl() );
 221         }
 222
 223         /**
 224          * Generate a FeedItem object from a given revision table row
 225          * Borrows Recent Changes' feed generation functions for formatting;
 226          * includes a diff to the previous revision (if any).
 227          *
 228          * @param $row
 229          * @return FeedItem
 230          */
 231         function feedItem( $row ) {
 232                 $rev = new Revision( $row );
 233                 $rev->setTitle( $this->title );
 234                 $text = FeedUtils::formatDiffRow( $this->title,
 235                 $this->title->getPreviousRevisionID( $rev->getId() ),
 236                 $rev->getId(),
 237                 $rev->getTimestamp(),
 238                 $rev->getComment() );
 239
 240                 if( $rev->getComment() == '' ) {
 241                         global $wgContLang;
 242                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 243                         $rev->getUserText(),
 244                         $wgContLang->timeanddate( $rev->getTimestamp() ) );
 245                 } else {
 246                         $title = $rev->getUserText() . wfMsgForContent( 'colon-separator' ) . FeedItem::stripComment( $rev->getComment() );
 247                 }
 248
 249                 return new FeedItem(
 250                         $title,
 251                         $text,
 252                         $this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 253                         $rev->getTimestamp(),
 254                         $rev->getUserText(),
 255                         $this->title->getTalkPage()->getFullUrl() );
 256         }
 257 }
 258
 259
 260 /**
 261  * @ingroup Pager
 262  */
 263 class HistoryPager extends ReverseChronologicalPager {
 264         public $lastRow = false, $counter, $historyPage, $title, $buttons;
 265         protected $oldIdChecked;
 266
 267         function __construct( $historyPage, $year='', $month='', $tagFilter = '' ) {
 268                 parent::__construct();
 269                 $this->historyPage = $historyPage;
 270                 $this->title = $this->historyPage->title;
 271                 $this->tagFilter = $tagFilter;
 272                 $this->getDateCond( $year, $month );
 273         }
 274
 275         // For hook compatibility...
 276         function getArticle() {
 277                 return $this->historyPage->getArticle();
 278         }
 279
 280         function getQueryInfo() {
 281                 $queryInfo = array(
 282                         'tables'  => array('revision'),
 283                         'fields'  => array_merge( Revision::selectFields(), array('ts_tags') ),
 284                         'conds'   => array('rev_page' => $this->historyPage->title->getArticleID() ),
 285                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') ),
 286                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 287                 );
 288                 ChangeTags::modifyDisplayQuery( $queryInfo['tables'],
 289                                                                                 $queryInfo['fields'],
 290                                                                                 $queryInfo['conds'],
 291                                                                                 $queryInfo['join_conds'],
 292                                                                                 $queryInfo['options'],
 293                                                                                 $this->tagFilter );
 294                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 295                 return $queryInfo;
 296         }
 297
 298         function getIndexField() {
 299                 return 'rev_timestamp';
 300         }
 301
 302         function formatRow( $row ) {
 303                 if( $this->lastRow ) {
 304                         $latest = $this->counter == 1 && $this->mIsFirst;
 305                         $firstInList = $this->counter == 1;
 306                         $s = $this->historyLine( $this->lastRow, $row, $this->counter++,
 307                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 308                 } else {
 309                         $s = '';
 310                 }
 311                 $this->lastRow = $row;
 312                 return $s;
 313         }
 314
 315         /**
 316          * Creates begin of history list with a submit button
 317          *
 318          * @return string HTML output
 319          */
 320         function getStartBody() {
 321                 global $wgScript, $wgEnableHtmlDiff, $wgUser, $wgOut;
 322                 $this->lastRow = false;
 323                 $this->counter = 1;
 324                 $this->oldIdChecked = 0;
 325
 326                 $wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1</div>", 'histlegend' );
 327                 $s = Xml::openElement( 'form', array( 'action' => $wgScript,
 328                         'id' => 'mw-history-compare' ) ) . "\n";
 329                 $s .= Xml::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
 330
 331                 $this->buttons = '<div>';
 332                 if( $wgUser->isAllowed('deleterevision') ) {
 333                         $this->buttons .= Xml::element( 'button',
 334                                 array(
 335                                         'type' => 'submit',
 336                                         'name' => 'action',
 337                                         'value' => 'revisiondelete',
 338                                         'style' => 'float: right',
 339                                 ),
 340                                 wfMsg( 'showhideselectedversions' )
 341                         ) . "\n";
 342                 }
 343                 if( $wgEnableHtmlDiff ) {
 344                         $this->buttons .= Xml::element( 'button',
 345                                 array(
 346                                         'type'      => 'submit',
 347                                         'name'      => 'htmldiff',
 348                                         'value'     => '1',
 349                                         'class'     => 'historysubmit',
 350                                         'accesskey' => wfMsg( 'accesskey-visualcomparison' ),
 351                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 352                                 ),
 353                                 wfMsg( 'visualcomparison')
 354                         ) . "\n";
 355                         $this->buttons .= $this->submitButton( wfMsg( 'wikicodecomparison'),
 356                                 array(
 357                                         'class'     => 'historysubmit',
 358                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 359                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 360                                 )
 361                         ) . "\n";
 362                 } else {
 363                         $this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions'),
 364                                 array(
 365                                         'class'     => 'historysubmit',
 366                                         'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 367                                         'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 368                                 )
 369                         ) . "\n";
 370                 }
 371                 $this->buttons .= '</div>';
 372                 $s .= $this->buttons . '<ul id="pagehistory">' . "\n";
 373                 return $s;
 374         }
 375
 376         function getEndBody() {
 377                 if( $this->lastRow ) {
 378                         $latest = $this->counter == 1 && $this->mIsFirst;
 379                         $firstInList = $this->counter == 1;
 380                         if( $this->mIsBackwards ) {
 381                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 382                                 if( $this->mOffset == '' ) {
 383                                         $next = null;
 384                                 } else {
 385                                         $next = 'unknown';
 386                                 }
 387                         } else {
 388                                 # The next row is the past-the-end row
 389                                 $next = $this->mPastTheEndRow;
 390                         }
 391                         $s = $this->historyLine( $this->lastRow, $next, $this->counter++,
 392                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 393                 } else {
 394                         $s = '';
 395                 }
 396                 $s .= "</ul>\n";
 397                 $s .= $this->buttons;
 398                 $s .= '</form>';
 399                 return $s;
 400         }
 401
 402         /**
 403          * Creates a submit button
 404          *
 405          * @param array $attributes attributes
 406          * @return string HTML output for the submit button
 407          */
 408         function submitButton($message, $attributes = array() ) {
 409                 # Disable submit button if history has 1 revision only
 410                 if( $this->getNumRows() > 1 ) {
 411                         return Xml::submitButton( $message , $attributes );
 412                 } else {
 413                         return '';
 414                 }
 415         }
 416
 417         /**
 418          * Returns a row from the history printout.
 419          *
 420          * @todo document some more, and maybe clean up the code (some params redundant?)
 421          *
 422          * @param Row $row The database row corresponding to the previous line.
 423          * @param mixed $next The database row corresponding to the next line.
 424          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 425          * @param $notificationtimestamp
 426          * @param bool $latest Whether this row corresponds to the page's latest revision.
 427          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 428          * @return string HTML output for the row
 429          */
 430         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false,
 431                 $latest = false, $firstInList = false )
 432         {
 433                 global $wgUser, $wgLang;
 434                 $rev = new Revision( $row );
 435                 $rev->setTitle( $this->title );
 436
 437                 $curlink = $this->curLink( $rev, $latest );
 438                 $lastlink = $this->lastLink( $rev, $next, $counter );
 439                 $diffButtons = $this->diffButtons( $rev, $firstInList, $counter );
 440                 $link = $this->revLink( $rev );
 441                 $classes = array();
 442
 443                 $s = "($curlink) ($lastlink) $diffButtons";
 444
 445                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 446                         // If revision was hidden from sysops
 447                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 448                                 $del = Xml::check( 'deleterevisions', false, array('disabled' => 'disabled') );
 449                         // Otherwise, show the link...
 450                         } else {
 451                                 $id = $rev->getId();
 452                                 $del = Xml::check( 'showhiderevisions', false, array( 'name' => "ids[$id]" ) );
 453                         }
 454                         $s .= " $del ";
 455                 }
 456
 457                 $s .= " $link";
 458                 $s .= " <span class='history-user'>" . $this->getSkin()->revUserTools( $rev, true ) . "</span>";
 459
 460                 if( $rev->isMinor() ) {
 461                         $s .= ' ' . ChangesList::flag( 'minor' );
 462                 }
 463
 464                 if( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 465                         $s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
 466                 }
 467
 468                 $s .= $this->getSkin()->revComment( $rev, false, true );
 469
 470                 if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
 471                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 472                 }
 473
 474                 $tools = array();
 475
 476                 if( !is_null( $next ) && is_object( $next ) ) {
 477                         if( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
 478                                 $tools[] = '<span class="mw-rollback-link">'.
 479                                         $this->getSkin()->buildRollbackLink( $rev ).'</span>';
 480                         }
 481
 482                         if( $this->title->quickUserCan( 'edit' )
 483                                 && !$rev->isDeleted( Revision::DELETED_TEXT )
 484                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 485                         {
 486                                 # Create undo tooltip for the first (=latest) line only
 487                                 $undoTooltip = $latest
 488                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 489                                         : array();
 490                                 $undolink = $this->getSkin()->link(
 491                                         $this->title,
 492                                         wfMsgHtml( 'editundo' ),
 493                                         $undoTooltip,
 494                                         array( 'action' => 'edit', 'undoafter' => $next->rev_id, 'undo' => $rev->getId() ),
 495                                         array( 'known', 'noclasses' )
 496                                 );
 497                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 498                         }
 499                 }
 500
 501                 if( $tools ) {
 502                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 503                 }
 504
 505                 # Tags
 506                 list($tagSummary, $newClasses) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 507                 $classes = array_merge( $classes, $newClasses );
 508                 $s .= " $tagSummary";
 509
 510                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 511
 512                 $attribs = array();
 513                 if ( $classes ) {
 514                         $attribs['class'] = implode( ' ', $classes );
 515                 }
 516
 517                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 518         }
 519
 520         /**
 521          * Create a link to view this revision of the page
 522          * @param Revision $rev
 523          * @returns string
 524          */
 525         function revLink( $rev ) {
 526                 global $wgLang;
 527                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 528                 $date = htmlspecialchars( $date );
 529                 if( !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 530                         $link = $this->getSkin()->link(
 531                                 $this->title,
 532                                 $date,
 533                                 array(),
 534                                 array( 'oldid' => $rev->getId() ),
 535                                 array( 'known', 'noclasses' )
 536                         );
 537                 } else {
 538                         $link = "<span class=\"history-deleted\">$date</span>";
 539                 }
 540                 return $link;
 541         }
 542
 543         /**
 544          * Create a diff-to-current link for this revision for this page
 545          * @param Revision $rev
 546          * @param Bool $latest, this is the latest revision of the page?
 547          * @returns string
 548          */
 549         function curLink( $rev, $latest ) {
 550                 $cur = $this->historyPage->message['cur'];
 551                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 552                         return $cur;
 553                 } else {
 554                         return $this->getSkin()->link(
 555                                 $this->title,
 556                                 $cur,
 557                                 array(),
 558                                 array(
 559                                         'diff' => $this->title->getLatestRevID(),
 560                                         'oldid' => $rev->getId()
 561                                 ),
 562                                 array( 'known', 'noclasses' )
 563                         );
 564                 }
 565         }
 566
 567         /**
 568          * Create a diff-to-previous link for this revision for this page.
 569          * @param Revision $prevRev, the previous revision
 570          * @param mixed $next, the newer revision
 571          * @param int $counter, what row on the history list this is
 572          * @returns string
 573          */
 574         function lastLink( $prevRev, $next, $counter ) {
 575                 $last = $this->historyPage->message['last'];
 576                 # $next may either be a Row, null, or "unkown"
 577                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 578                 if( is_null($next) ) {
 579                         # Probably no next row
 580                         return $last;
 581                 } elseif( $next === 'unknown' ) {
 582                         # Next row probably exists but is unknown, use an oldid=prev link
 583                         return $this->getSkin()->link(
 584                                 $this->title,
 585                                 $last,
 586                                 array(),
 587                                 array(
 588                                         'diff' => $prevRev->getId(),
 589                                         'oldid' => 'prev'
 590                                 ),
 591                                 array( 'known', 'noclasses' )
 592                         );
 593                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 594                         return $last;
 595                 } else {
 596                         return $this->getSkin()->link(
 597                                 $this->title,
 598                                 $last,
 599                                 array(),
 600                                 array(
 601                                         'diff' => $prevRev->getId(),
 602                                         'oldid' => $next->rev_id
 603                                 ),
 604                                 array( 'known', 'noclasses' )
 605                         );
 606                 }
 607         }
 608
 609         /**
 610          * Create radio buttons for page history
 611          *
 612          * @param object $rev Revision
 613          * @param bool $firstInList Is this version the first one?
 614          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 615          * @return string HTML output for the radio buttons
 616          */
 617         function diffButtons( $rev, $firstInList, $counter ) {
 618                 if( $this->getNumRows() > 1 ) {
 619                         $id = $rev->getId();
 620                         $radio = array( 'type'  => 'radio', 'value' => $id );
 621                         /** @todo: move title texts to javascript */
 622                         if( $firstInList ) {
 623                                 $first = Xml::element( 'input',
 624                                         array_merge( $radio, array(
 625                                                 'style' => 'visibility:hidden',
 626                                                 'name'  => 'oldid',
 627                                                 'id' => 'mw-oldid-null' ) )
 628                                 );
 629                                 $checkmark = array( 'checked' => 'checked' );
 630                         } else {
 631                                 # Check visibility of old revisions
 632                                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 633                                         $radio['disabled'] = 'disabled';
 634                                         $checkmark = array(); // We will check the next possible one
 635                                 } else if( $counter == 2 || !$this->oldIdChecked ) {
 636                                         $checkmark = array( 'checked' => 'checked' );
 637                                         $this->oldIdChecked = $id;
 638                                 } else {
 639                                         $checkmark = array();
 640                                 }
 641                                 $first = Xml::element( 'input',
 642                                         array_merge( $radio, $checkmark, array(
 643                                                 'name'  => 'oldid',
 644                                                 'id' => "mw-oldid-$id" ) ) );
 645                                 $checkmark = array();
 646                         }
 647                         $second = Xml::element( 'input',
 648                                 array_merge( $radio, $checkmark, array(
 649                                         'name'  => 'diff',
 650                                         'id' => "mw-diff-$id" ) ) );
 651                         return $first . $second;
 652                 } else {
 653                         return '';
 654                 }
 655         }
 656 }
 657
 658 /**
 659  * Backwards-compatibility aliases
 660  */
 661 class PageHistory extends HistoryPage {}
 662 class PageHistoryPager extends HistoryPager {}
 663