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                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  54                         foreach( $msgs as $msg ) {
  55                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities') );
  56                         }
  57                 }
  58         }
  59
  60         /**
  61          * Print the history page for an article.
  62          *
  63          * @returns nothing
  64          */
  65         function history() {
  66                 global $wgOut, $wgRequest, $wgScript;
  67
  68                 /*
  69                  * Allow client caching.
  70                  */
  71                 if( $wgOut->checkLastModified( $this->article->getTouched() ) )
  72                         return; // Client cache fresh and headers sent, nothing more to do.
  73
  74                 wfProfileIn( __METHOD__ );
  75
  76                 /*
  77                  * Setup page variables.
  78                  */
  79                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
  80                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  81                 $wgOut->setArticleFlag( false );
  82                 $wgOut->setArticleRelated( true );
  83                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  84                 $wgOut->setSyndicated( true );
  85                 $wgOut->setFeedAppendQuery( 'action=history' );
  86                 $wgOut->addScriptFile( 'history.js' );
  87
  88                 $logPage = SpecialPage::getTitleFor( 'Log' );
  89                 $logLink = $this->skin->link(
  90                         $logPage,
  91                         wfMsgHtml( 'viewpagelogs' ),
  92                         array(),
  93                         array( 'page' => $this->title->getPrefixedText() ),
  94                         array( 'known', 'noclasses' )
  95                 );
  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->title->exists() ) {
 108                         $wgOut->addWikiMsg( 'nohistory' );
 109                         # show deletion/move log if there is an entry
 110                         LogEventsList::showLogExtract(
 111                                 $wgOut,
 112                                 array( 'delete', 'move' ),
 113                                 $this->title->getPrefixedText(),
 114                                 '',
 115                                 array(  'lim' => 10,
 116                                         'conds' => array( "log_action != 'revision'" ),
 117                                         'showIfEmpty' => false,
 118                                         'msgKey' => array( 'moveddeleted-notice' )
 119                                 )
 120                         );
 121                         wfProfileOut( __METHOD__ );
 122                         return;
 123                 }
 124
 125                 /**
 126                  * Add date selector to quickly get to a certain time
 127                  */
 128                 $year = $wgRequest->getInt( 'year' );
 129                 $month = $wgRequest->getInt( 'month' );
 130                 $tagFilter = $wgRequest->getVal( 'tagfilter' );
 131                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 132                 /**
 133                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 134                  * Note that this can run a *long* time if there are many revisions to look at.
 135                  * We use "isBigDeletion" to determine if the history is too big to go through.
 136                  * Additionally, only users with 'deleterevision' right can filter for deleted edits.
 137                  */
 138                 if ( $this->title->userCan( 'deleterevision' ) && ( !$this->article->isBigDeletion() || $this->title->userCan( 'bigdelete' ) ) ) {
 139                         $conds = ( $wgRequest->getBool( 'deleted' ) ) ? array("rev_deleted != '0'") : array();
 140                         $checkDeleted = Xml::checkLabel( wfMsg( 'history-show-deleted' ), 'deleted', '', $wgRequest->getBool( 'deleted' ) ) . "\n";
 141                 }
 142                 else { # Don't filter and don't add the checkbox for filtering
 143                         $conds = array();
 144                         $checkDeleted = '';
 145                 }
 146
 147                 $action = htmlspecialchars( $wgScript );
 148                 $wgOut->addHTML(
 149                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 150                         Xml::fieldset(
 151                                 wfMsg( 'history-fieldset-title' ),
 152                                 false,
 153                                 array( 'id' => 'mw-history-search' )
 154                         ) .
 155                         Xml::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
 156                         Xml::hidden( 'action', 'history' ) . "\n" .
 157                         Xml::dateMenu( $year, $month ) . '&nbsp;' .
 158                         ( $tagSelector ? ( implode( '&nbsp;', $tagSelector ) . '&nbsp;' ) : '' ) .
 159                         $checkDeleted .
 160                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 161                         '</fieldset></form>'
 162                 );
 163
 164                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
 165
 166                 /**
 167                  * Do the list
 168                  */
 169                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 170                 $wgOut->addHTML(
 171                         $pager->getNavigationBar() .
 172                         $pager->getBody() .
 173                         $pager->getNavigationBar()
 174                 );
 175
 176                 wfProfileOut( __METHOD__ );
 177         }
 178
 179         /**
 180          * Fetch an array of revisions, specified by a given limit, offset and
 181          * direction. This is now only used by the feeds. It was previously
 182          * used by the main UI but that's now handled by the pager.
 183          */
 184         function fetchRevisions($limit, $offset, $direction) {
 185
 186                 // Fail if article doesn't exist.
 187                 if( !$this->mTitle || !$this->mTitle->exists() ) {
 188                         return array();
 189                 }
 190
 191                 $dbr = wfGetDB( DB_SLAVE );
 192
 193                 if( $direction == HistoryPage::DIR_PREV )
 194                         list($dirs, $oper) = array("ASC", ">=");
 195                 else /* $direction == HistoryPage::DIR_NEXT */
 196                         list($dirs, $oper) = array("DESC", "<=");
 197
 198                 if( $offset )
 199                         $offsets = array("rev_timestamp $oper '$offset'");
 200                 else
 201                         $offsets = array();
 202
 203                 $page_id = $this->title->getArticleID();
 204
 205                 return $dbr->select( 'revision',
 206                         Revision::selectFields(),
 207                         array_merge(array("rev_page=$page_id"), $offsets),
 208                         __METHOD__,
 209                         array( 'ORDER BY' => "rev_timestamp $dirs",
 210                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit)
 211                 );
 212         }
 213
 214         /**
 215          * Output a subscription feed listing recent edits to this page.
 216          * @param string $type
 217          */
 218         function feed( $type ) {
 219                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 220                 if( !FeedUtils::checkFeedOutput($type) ) {
 221                         return;
 222                 }
 223
 224                 $feed = new $wgFeedClasses[$type](
 225                         $this->title->getPrefixedText() . ' - ' .
 226                         wfMsgForContent( 'history-feed-title' ),
 227                         wfMsgForContent( 'history-feed-description' ),
 228                         $this->title->getFullUrl( 'action=history' )
 229                 );
 230
 231                 // Get a limit on number of feed entries. Provide a sane default
 232                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 233                 $limit = $wgRequest->getInt( 'limit', 10 );
 234                 if( $limit > $wgFeedLimit || $limit < 1 ) {
 235                         $limit = 10;
 236                 }
 237                 $items = $this->fetchRevisions($limit, 0, HistoryPage::DIR_NEXT);
 238
 239                 $feed->outHeader();
 240                 if( $items ) {
 241                         foreach( $items as $row ) {
 242                                 $feed->outItem( $this->feedItem( $row ) );
 243                         }
 244                 } else {
 245                         $feed->outItem( $this->feedEmpty() );
 246                 }
 247                 $feed->outFooter();
 248         }
 249
 250         function feedEmpty() {
 251                 global $wgOut;
 252                 return new FeedItem(
 253                         wfMsgForContent( 'nohistory' ),
 254                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 255                         $this->title->getFullUrl(),
 256                         wfTimestamp( TS_MW ),
 257                         '',
 258                         $this->title->getTalkPage()->getFullUrl()
 259                 );
 260         }
 261
 262         /**
 263          * Generate a FeedItem object from a given revision table row
 264          * Borrows Recent Changes' feed generation functions for formatting;
 265          * includes a diff to the previous revision (if any).
 266          *
 267          * @param $row
 268          * @return FeedItem
 269          */
 270         function feedItem( $row ) {
 271                 $rev = new Revision( $row );
 272                 $rev->setTitle( $this->title );
 273                 $text = FeedUtils::formatDiffRow(
 274                         $this->title,
 275                         $this->title->getPreviousRevisionID( $rev->getId() ),
 276                         $rev->getId(),
 277                         $rev->getTimestamp(),
 278                         $rev->getComment()
 279                 );
 280                 if( $rev->getComment() == '' ) {
 281                         global $wgContLang;
 282                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 283                                 $rev->getUserText(),
 284                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 285                                 $wgContLang->date( $rev->getTimestamp() ),
 286                                 $wgContLang->time( $rev->getTimestamp() )
 287                         );
 288                 } else {
 289                         $title = $rev->getUserText() .
 290                         wfMsgForContent( 'colon-separator' ) .
 291                         FeedItem::stripComment( $rev->getComment() );
 292                 }
 293                 return new FeedItem(
 294                         $title,
 295                         $text,
 296                         $this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 297                         $rev->getTimestamp(),
 298                         $rev->getUserText(),
 299                         $this->title->getTalkPage()->getFullUrl()
 300                 );
 301         }
 302 }
 303
 304 /**
 305  * @ingroup Pager
 306  */
 307 class HistoryPager extends ReverseChronologicalPager {
 308         public $lastRow = false, $counter, $historyPage, $title, $buttons, $conds;
 309         protected $oldIdChecked;
 310
 311         function __construct( $historyPage, $year='', $month='', $tagFilter = '', $conds = array() ) {
 312                 parent::__construct();
 313                 $this->historyPage = $historyPage;
 314                 $this->title = $this->historyPage->title;
 315                 $this->tagFilter = $tagFilter;
 316                 $this->getDateCond( $year, $month );
 317                 $this->conds = $conds;
 318         }
 319
 320         // For hook compatibility...
 321         function getArticle() {
 322                 return $this->historyPage->getArticle();
 323         }
 324
 325         function getQueryInfo() {
 326                 $queryInfo = array(
 327                         'tables'  => array('revision'),
 328                         'fields'  => array_merge( Revision::selectFields()),
 329                         'conds'   => array_merge( array('rev_page' => $this->historyPage->title->getArticleID() ), $this->conds ),
 330                         'options' => array( 'USE INDEX' => array('revision' => 'page_timestamp') ),
 331                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 332                 );
 333                 ChangeTags::modifyDisplayQuery(
 334                         $queryInfo['tables'],
 335                         $queryInfo['fields'],
 336                         $queryInfo['conds'],
 337                         $queryInfo['join_conds'],
 338                         $queryInfo['options'],
 339                         $this->tagFilter
 340                 );
 341                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 342                 return $queryInfo;
 343         }
 344
 345         function getIndexField() {
 346                 return 'rev_timestamp';
 347         }
 348
 349         function formatRow( $row ) {
 350                 if( $this->lastRow ) {
 351                         $latest = ($this->counter == 1 && $this->mIsFirst);
 352                         $firstInList = $this->counter == 1;
 353                         $s = $this->historyLine( $this->lastRow, $row, $this->counter++,
 354                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 355                 } else {
 356                         $s = '';
 357                 }
 358                 $this->lastRow = $row;
 359                 return $s;
 360         }
 361
 362         /**
 363          * Creates begin of history list with a submit button
 364          *
 365          * @return string HTML output
 366          */
 367         function getStartBody() {
 368                 global $wgScript, $wgUser, $wgOut, $wgContLang;
 369                 $this->lastRow = false;
 370                 $this->counter = 1;
 371                 $this->oldIdChecked = 0;
 372
 373                 $wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1</div>", 'histlegend' );
 374                 $s = Xml::openElement( 'form', array( 'action' => $wgScript,
 375                         'id' => 'mw-history-compare' ) ) . "\n";
 376                 $s .= Xml::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
 377                 $s .= Xml::hidden( 'action', 'historysubmit' ) . "\n";
 378
 379                 $this->buttons = '<div>';
 380                 if( $wgUser->isAllowed('deleterevision') ) {
 381                         $float = $wgContLang->alignEnd();
 382                         # Note bug #20966, <button> is non-standard in IE<8
 383                         $this->buttons .= Xml::element( 'button',
 384                                 array(
 385                                         'type' => 'submit',
 386                                         'name' => 'revisiondelete',
 387                                         'value' => '1',
 388                                         'style' => "float: $float;",
 389                                         'class' => 'mw-history-revisiondelete-button',
 390                                 ),
 391                                 wfMsg( 'showhideselectedversions' )
 392                         ) . "\n";
 393                 }
 394                 $this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions'),
 395                         array(
 396                                 'class'     => 'historysubmit',
 397                                 'accesskey' => wfMsg( 'accesskey-compareselectedversions' ),
 398                                 'title'     => wfMsg( 'tooltip-compareselectedversions' ),
 399                         )
 400                 ) . "\n";
 401                 $this->buttons .= '</div>';
 402                 $s .= $this->buttons . '<ul id="pagehistory">' . "\n";
 403                 return $s;
 404         }
 405
 406         function getEndBody() {
 407                 if( $this->lastRow ) {
 408                         $latest = $this->counter == 1 && $this->mIsFirst;
 409                         $firstInList = $this->counter == 1;
 410                         if( $this->mIsBackwards ) {
 411                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 412                                 if( $this->mOffset == '' ) {
 413                                         $next = null;
 414                                 } else {
 415                                         $next = 'unknown';
 416                                 }
 417                         } else {
 418                                 # The next row is the past-the-end row
 419                                 $next = $this->mPastTheEndRow;
 420                         }
 421                         $s = $this->historyLine( $this->lastRow, $next, $this->counter++,
 422                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 423                 } else {
 424                         $s = '';
 425                 }
 426                 $s .= "</ul>\n";
 427                 # Add second buttons only if there is more than one rev
 428                 if( $this->getNumRows() > 2 ) {
 429                         $s .= $this->buttons;
 430                 }
 431                 $s .= '</form>';
 432                 return $s;
 433         }
 434
 435         /**
 436          * Creates a submit button
 437          *
 438          * @param array $attributes attributes
 439          * @return string HTML output for the submit button
 440          */
 441         function submitButton($message, $attributes = array() ) {
 442                 # Disable submit button if history has 1 revision only
 443                 if( $this->getNumRows() > 1 ) {
 444                         return Xml::submitButton( $message , $attributes );
 445                 } else {
 446                         return '';
 447                 }
 448         }
 449
 450         /**
 451          * Returns a row from the history printout.
 452          *
 453          * @todo document some more, and maybe clean up the code (some params redundant?)
 454          *
 455          * @param Row $row The database row corresponding to the previous line.
 456          * @param mixed $next The database row corresponding to the next line.
 457          * @param int $counter Apparently a counter of what row number we're at, counted from the top row = 1.
 458          * @param $notificationtimestamp
 459          * @param bool $latest Whether this row corresponds to the page's latest revision.
 460          * @param bool $firstInList Whether this row corresponds to the first displayed on this history page.
 461          * @return string HTML output for the row
 462          */
 463         function historyLine( $row, $next, $counter = '', $notificationtimestamp = false,
 464                 $latest = false, $firstInList = false )
 465         {
 466                 global $wgUser, $wgLang;
 467                 $rev = new Revision( $row );
 468                 $rev->setTitle( $this->title );
 469
 470                 $curlink = $this->curLink( $rev, $latest );
 471                 $lastlink = $this->lastLink( $rev, $next, $counter );
 472                 $diffButtons = $this->diffButtons( $rev, $firstInList, $counter );
 473                 $histLinks = Html::rawElement(
 474                                 'span',
 475                                 array( 'class' => 'mw-history-histlinks' ),
 476                                 '(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
 477                 );
 478                 $s = $histLinks . $diffButtons;
 479
 480                 $link = $this->revLink( $rev );
 481                 $classes = array();
 482
 483                 $del = '';
 484                 // User can delete revisions...
 485                 if( $wgUser->isAllowed( 'deleterevision' ) ) {
 486                         // If revision was hidden from sysops, disable the checkbox
 487                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 488                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 489                         // Otherwise, enable the checkbox...
 490                         } else {
 491                                 $del = Xml::check( 'showhiderevisions', false, array( 'name' => 'ids['.$rev->getId().']' ) );
 492                         }
 493                 // User can only view deleted revisions...
 494                 } else if( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) {
 495                         // If revision was hidden from sysops, disable the link
 496                         if( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 497                                 $cdel = $this->getSkin()->revDeleteLinkDisabled( false );
 498                         // Otherwise, show the link...
 499                         } else {
 500                                 $query = array( 'type' => 'revision',
 501                                         'target' => $this->title->getPrefixedDbkey(), 'ids' => $rev->getId() );
 502                                 $del .= $this->getSkin()->revDeleteLink( $query,
 503                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 504                         }
 505                 }
 506                 if( $del ) $s .= " $del ";
 507
 508                 $s .= " $link";
 509                 $s .= " <span class='history-user'>" . $this->getSkin()->revUserTools( $rev, true ) . "</span>";
 510
 511                 if( $rev->isMinor() ) {
 512                         $s .= ' ' . ChangesList::flag( 'minor' );
 513                 }
 514
 515                 if( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 516                         $s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
 517                 }
 518
 519                 $s .= $this->getSkin()->revComment( $rev, false, true );
 520
 521                 if( $notificationtimestamp && ($row->rev_timestamp >= $notificationtimestamp) ) {
 522                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 523                 }
 524
 525                 $tools = array();
 526
 527                 # Rollback and undo links
 528                 if( !is_null( $next ) && is_object( $next ) ) {
 529                         if( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
 530                                 $tools[] = '<span class="mw-rollback-link">'.
 531                                         $this->getSkin()->buildRollbackLink( $rev ).'</span>';
 532                         }
 533
 534                         if( $this->title->quickUserCan( 'edit' )
 535                                 && !$rev->isDeleted( Revision::DELETED_TEXT )
 536                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 537                         {
 538                                 # Create undo tooltip for the first (=latest) line only
 539                                 $undoTooltip = $latest
 540                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 541                                         : array();
 542                                 $undolink = $this->getSkin()->link(
 543                                         $this->title,
 544                                         wfMsgHtml( 'editundo' ),
 545                                         $undoTooltip,
 546                                         array(
 547                                                 'action' => 'edit',
 548                                                 'undoafter' => $next->rev_id,
 549                                                 'undo' => $rev->getId()
 550                                         ),
 551                                         array( 'known', 'noclasses' )
 552                                 );
 553                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 554                         }
 555                 }
 556
 557                 if( $tools ) {
 558                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 559                 }
 560
 561                 # Tags
 562                 list($tagSummary, $newClasses) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 563                 $classes = array_merge( $classes, $newClasses );
 564                 $s .= " $tagSummary";
 565
 566                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s ) );
 567
 568                 $attribs = array();
 569                 if ( $classes ) {
 570                         $attribs['class'] = implode( ' ', $classes );
 571                 }
 572
 573                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 574         }
 575
 576         /**
 577          * Create a link to view this revision of the page
 578          * @param Revision $rev
 579          * @returns string
 580          */
 581         function revLink( $rev ) {
 582                 global $wgLang;
 583                 $date = $wgLang->timeanddate( wfTimestamp(TS_MW, $rev->getTimestamp()), true );
 584                 $date = htmlspecialchars( $date );
 585                 if( !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 586                         $link = $this->getSkin()->link(
 587                                 $this->title,
 588                                 $date,
 589                                 array(),
 590                                 array( 'oldid' => $rev->getId() ),
 591                                 array( 'known', 'noclasses' )
 592                         );
 593                 } else {
 594                         $link = "<span class=\"history-deleted\">$date</span>";
 595                 }
 596                 return $link;
 597         }
 598
 599         /**
 600          * Create a diff-to-current link for this revision for this page
 601          * @param Revision $rev
 602          * @param Bool $latest, this is the latest revision of the page?
 603          * @returns string
 604          */
 605         function curLink( $rev, $latest ) {
 606                 $cur = $this->historyPage->message['cur'];
 607                 if( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 608                         return $cur;
 609                 } else {
 610                         return $this->getSkin()->link(
 611                                 $this->title,
 612                                 $cur,
 613                                 array(),
 614                                 array(
 615                                         'diff' => $this->title->getLatestRevID(),
 616                                         'oldid' => $rev->getId()
 617                                 ),
 618                                 array( 'known', 'noclasses' )
 619                         );
 620                 }
 621         }
 622
 623         /**
 624          * Create a diff-to-previous link for this revision for this page.
 625          * @param Revision $prevRev, the previous revision
 626          * @param mixed $next, the newer revision
 627          * @param int $counter, what row on the history list this is
 628          * @returns string
 629          */
 630         function lastLink( $prevRev, $next, $counter ) {
 631                 $last = $this->historyPage->message['last'];
 632                 # $next may either be a Row, null, or "unkown"
 633                 $nextRev = is_object($next) ? new Revision( $next ) : $next;
 634                 if( is_null($next) ) {
 635                         # Probably no next row
 636                         return $last;
 637                 } elseif( $next === 'unknown' ) {
 638                         # Next row probably exists but is unknown, use an oldid=prev link
 639                         return $this->getSkin()->link(
 640                                 $this->title,
 641                                 $last,
 642                                 array(),
 643                                 array(
 644                                         'diff' => $prevRev->getId(),
 645                                         'oldid' => 'prev'
 646                                 ),
 647                                 array( 'known', 'noclasses' )
 648                         );
 649                 } elseif( !$prevRev->userCan(Revision::DELETED_TEXT) || !$nextRev->userCan(Revision::DELETED_TEXT) ) {
 650                         return $last;
 651                 } else {
 652                         return $this->getSkin()->link(
 653                                 $this->title,
 654                                 $last,
 655                                 array(),
 656                                 array(
 657                                         'diff' => $prevRev->getId(),
 658                                         'oldid' => $next->rev_id
 659                                 ),
 660                                 array( 'known', 'noclasses' )
 661                         );
 662                 }
 663         }
 664
 665         /**
 666          * Create radio buttons for page history
 667          *
 668          * @param object $rev Revision
 669          * @param bool $firstInList Is this version the first one?
 670          * @param int $counter A counter of what row number we're at, counted from the top row = 1.
 671          * @return string HTML output for the radio buttons
 672          */
 673         function diffButtons( $rev, $firstInList, $counter ) {
 674                 if( $this->getNumRows() > 1 ) {
 675                         $id = $rev->getId();
 676                         $radio = array( 'type'  => 'radio', 'value' => $id );
 677                         /** @todo: move title texts to javascript */
 678                         if( $firstInList ) {
 679                                 $first = Xml::element( 'input',
 680                                         array_merge( $radio, array(
 681                                                 'style' => 'visibility:hidden',
 682                                                 'name'  => 'oldid',
 683                                                 'id' => 'mw-oldid-null' ) )
 684                                 );
 685                                 $checkmark = array( 'checked' => 'checked' );
 686                         } else {
 687                                 # Check visibility of old revisions
 688                                 if( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 689                                         $radio['disabled'] = 'disabled';
 690                                         $checkmark = array(); // We will check the next possible one
 691                                 } else if( $counter == 2 || !$this->oldIdChecked ) {
 692                                         $checkmark = array( 'checked' => 'checked' );
 693                                         $this->oldIdChecked = $id;
 694                                 } else {
 695                                         $checkmark = array();
 696                                 }
 697                                 $first = Xml::element( 'input',
 698                                         array_merge( $radio, $checkmark, array(
 699                                                 'name'  => 'oldid',
 700                                                 'id' => "mw-oldid-$id" ) ) );
 701                                 $checkmark = array();
 702                         }
 703                         $second = Xml::element( 'input',
 704                                 array_merge( $radio, $checkmark, array(
 705                                         'name'  => 'diff',
 706                                         'id' => "mw-diff-$id" ) ) );
 707                         return $first . $second;
 708                 } else {
 709                         return '';
 710                 }
 711         }
 712 }
 713
 714 /**
 715  * Backwards-compatibility aliases
 716  */
 717 class PageHistory extends HistoryPage {}
 718 class PageHistoryPager extends HistoryPager {}