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         /** Contains the Article object. Passed on construction. */
  23         private $article;
  24         /** The $article title object. Found on construction. */
  25         private $title;
  26         /** Shortcut to the user Skin object. */
  27         private $skin;
  28
  29         /**
  30          * Construct a new HistoryPage.
  31          *
  32          * @param $article Article
  33          */
  34         function __construct( $article ) {
  35                 global $wgUser;
  36                 $this->article = $article;
  37                 $this->title = $article->getTitle();
  38                 $this->skin = $wgUser->getSkin();
  39                 $this->preCacheMessages();
  40         }
  41
  42         /** Get the Article object we are working on. */
  43         public function getArticle() {
  44                 return $this->article;
  45         }
  46
  47         /** Get the Title object. */
  48         public function getTitle() {
  49                 return $this->title;
  50         }
  51
  52         /**
  53          * As we use the same small set of messages in various methods and that
  54          * they are called often, we call them once and save them in $this->message
  55          */
  56         private function preCacheMessages() {
  57                 // Precache various messages
  58                 if ( !isset( $this->message ) ) {
  59                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  60                         foreach ( $msgs as $msg ) {
  61                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
  62                         }
  63                 }
  64         }
  65
  66         /**
  67          * Print the history page for an article.
  68          * @return nothing
  69          */
  70         function history() {
  71                 global $wgOut, $wgRequest, $wgScript;
  72
  73                 /**
  74                  * Allow client caching.
  75                  */
  76                 if ( $wgOut->checkLastModified( $this->article->getTouched() ) )
  77                         return; // Client cache fresh and headers sent, nothing more to do.
  78
  79                 wfProfileIn( __METHOD__ );
  80
  81                 // Setup page variables.
  82                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
  83                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  84                 $wgOut->setArticleFlag( false );
  85                 $wgOut->setArticleRelated( true );
  86                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  87                 $wgOut->setSyndicated( true );
  88                 $wgOut->setFeedAppendQuery( 'action=history' );
  89                 $wgOut->addModules( array( 'mediawiki.legacy.history', 'mediawiki.action.history' ) );
  90
  91                 // Creation of a subtitle link pointing to [[Special:Log]]
  92                 $logPage = SpecialPage::getTitleFor( 'Log' );
  93                 $logLink = $this->skin->link(
  94                         $logPage,
  95                         wfMsgHtml( 'viewpagelogs' ),
  96                         array(),
  97                         array( 'page' => $this->title->getPrefixedText() ),
  98                         array( 'known', 'noclasses' )
  99                 );
 100                 $wgOut->setSubtitle( $logLink );
 101
 102                 // Handle atom/RSS feeds.
 103                 $feedType = $wgRequest->getVal( 'feed' );
 104                 if ( $feedType ) {
 105                         wfProfileOut( __METHOD__ );
 106                         return $this->feed( $feedType );
 107                 }
 108
 109                 // Fail nicely if article doesn't exist.
 110                 if ( !$this->title->exists() ) {
 111                         $wgOut->addWikiMsg( 'nohistory' );
 112                         # show deletion/move log if there is an entry
 113                         LogEventsList::showLogExtract(
 114                                 $wgOut,
 115                                 array( 'delete', 'move' ),
 116                                 $this->title->getPrefixedText(),
 117                                 '',
 118                                 array(  'lim' => 10,
 119                                         'conds' => array( "log_action != 'revision'" ),
 120                                         'showIfEmpty' => false,
 121                                         'msgKey' => array( 'moveddeleted-notice' )
 122                                 )
 123                         );
 124                         wfProfileOut( __METHOD__ );
 125                         return;
 126                 }
 127
 128                 /**
 129                  * Add date selector to quickly get to a certain time
 130                  */
 131                 $year        = $wgRequest->getInt( 'year' );
 132                 $month       = $wgRequest->getInt( 'month' );
 133                 $tagFilter   = $wgRequest->getVal( 'tagfilter' );
 134                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 135
 136                 /**
 137                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 138                  */
 139                 if ( $wgRequest->getBool( 'deleted' ) ) {
 140                         $conds = array( "rev_deleted != '0'" );
 141                 } else {
 142                         $conds = array();
 143                 }
 144                 $checkDeleted = Xml::checkLabel( wfMsg( 'history-show-deleted' ),
 145                         'deleted', 'mw-show-deleted-only', $wgRequest->getBool( 'deleted' ) ) . "\n";
 146
 147                 // Add the general form
 148                 $action = htmlspecialchars( $wgScript );
 149                 $wgOut->addHTML(
 150                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 151                         Xml::fieldset(
 152                                 wfMsg( 'history-fieldset-title' ),
 153                                 false,
 154                                 array( 'id' => 'mw-history-search' )
 155                         ) .
 156                         Html::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
 157                         Html::hidden( 'action', 'history' ) . "\n" .
 158                         Xml::dateMenu( $year, $month ) . '&#160;' .
 159                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 160                         $checkDeleted .
 161                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 162                         '</fieldset></form>'
 163                 );
 164
 165                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
 166
 167                 // Create and output the list.
 168                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 169                 $wgOut->addHTML(
 170                         $pager->getNavigationBar() .
 171                         $pager->getBody() .
 172                         $pager->getNavigationBar()
 173                 );
 174
 175                 wfProfileOut( __METHOD__ );
 176         }
 177
 178         /**
 179          * Fetch an array of revisions, specified by a given limit, offset and
 180          * direction. This is now only used by the feeds. It was previously
 181          * used by the main UI but that's now handled by the pager.
 182          *
 183          * @param $limit Integer: the limit number of revisions to get
 184          * @param $offset Integer
 185          * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
 186          * @return ResultWrapper
 187          */
 188         function fetchRevisions( $limit, $offset, $direction ) {
 189                 $dbr = wfGetDB( DB_SLAVE );
 190
 191                 if ( $direction == HistoryPage::DIR_PREV ) {
 192                         list( $dirs, $oper ) = array( "ASC", ">=" );
 193                 } else { /* $direction == HistoryPage::DIR_NEXT */
 194                         list( $dirs, $oper ) = array( "DESC", "<=" );
 195                 }
 196
 197                 if ( $offset ) {
 198                         $offsets = array( "rev_timestamp $oper '$offset'" );
 199                 } else {
 200                         $offsets = array();
 201                 }
 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          *
 217          * @param $type String: feed type
 218          */
 219         function feed( $type ) {
 220                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 221                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 222                         return;
 223                 }
 224
 225                 $feed = new $wgFeedClasses[$type](
 226                         $this->title->getPrefixedText() . ' - ' .
 227                         wfMsgForContent( 'history-feed-title' ),
 228                         wfMsgForContent( 'history-feed-description' ),
 229                         $this->title->getFullUrl( 'action=history' )
 230                 );
 231
 232                 // Get a limit on number of feed entries. Provide a sane default
 233                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 234                 $limit = $wgRequest->getInt( 'limit', 10 );
 235                 if ( $limit > $wgFeedLimit || $limit < 1 ) {
 236                         $limit = 10;
 237                 }
 238                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 239
 240                 // Generate feed elements enclosed between header and footer.
 241                 $feed->outHeader();
 242                 if ( $items ) {
 243                         foreach ( $items as $row ) {
 244                                 $feed->outItem( $this->feedItem( $row ) );
 245                         }
 246                 } else {
 247                         $feed->outItem( $this->feedEmpty() );
 248                 }
 249                 $feed->outFooter();
 250         }
 251
 252         function feedEmpty() {
 253                 global $wgOut;
 254                 return new FeedItem(
 255                         wfMsgForContent( 'nohistory' ),
 256                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 257                         $this->title->getFullUrl(),
 258                         wfTimestamp( TS_MW ),
 259                         '',
 260                         $this->title->getTalkPage()->getFullUrl()
 261                 );
 262         }
 263
 264         /**
 265          * Generate a FeedItem object from a given revision table row
 266          * Borrows Recent Changes' feed generation functions for formatting;
 267          * includes a diff to the previous revision (if any).
 268          *
 269          * @param $row Object: database row
 270          * @return FeedItem
 271          */
 272         function feedItem( $row ) {
 273                 $rev = new Revision( $row );
 274                 $rev->setTitle( $this->title );
 275                 $text = FeedUtils::formatDiffRow(
 276                         $this->title,
 277                         $this->title->getPreviousRevisionID( $rev->getId() ),
 278                         $rev->getId(),
 279                         $rev->getTimestamp(),
 280                         $rev->getComment()
 281                 );
 282                 if ( $rev->getComment() == '' ) {
 283                         global $wgContLang;
 284                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 285                                 $rev->getUserText(),
 286                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 287                                 $wgContLang->date( $rev->getTimestamp() ),
 288                                 $wgContLang->time( $rev->getTimestamp() )
 289                         );
 290                 } else {
 291                         $title = $rev->getUserText() .
 292                         wfMsgForContent( 'colon-separator' ) .
 293                         FeedItem::stripComment( $rev->getComment() );
 294                 }
 295                 return new FeedItem(
 296                         $title,
 297                         $text,
 298                         $this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 299                         $rev->getTimestamp(),
 300                         $rev->getUserText(),
 301                         $this->title->getTalkPage()->getFullUrl()
 302                 );
 303         }
 304 }
 305
 306 /**
 307  * @ingroup Pager
 308  */
 309 class HistoryPager extends ReverseChronologicalPager {
 310         public $lastRow = false, $counter, $historyPage, $title, $buttons, $conds;
 311         protected $oldIdChecked;
 312
 313         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 314                 parent::__construct();
 315                 $this->historyPage = $historyPage;
 316                 $this->title = $this->historyPage->getTitle();
 317                 $this->tagFilter = $tagFilter;
 318                 $this->getDateCond( $year, $month );
 319                 $this->conds = $conds;
 320         }
 321
 322         // For hook compatibility...
 323         function getArticle() {
 324                 return $this->historyPage->getArticle();
 325         }
 326
 327         function getSqlComment() {
 328                 if ( $this->conds ) {
 329                         return 'history page filtered'; // potentially slow, see CR r58153
 330                 } else {
 331                         return 'history page unfiltered';
 332                 }
 333         }
 334
 335         function getQueryInfo() {
 336                 $queryInfo = array(
 337                         'tables'  => array( 'revision' ),
 338                         'fields'  => Revision::selectFields(),
 339                         'conds'   => array_merge(
 340                                 array( 'rev_page' => $this->historyPage->getTitle()->getArticleID() ),
 341                                 $this->conds ),
 342                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 343                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 344                 );
 345                 ChangeTags::modifyDisplayQuery(
 346                         $queryInfo['tables'],
 347                         $queryInfo['fields'],
 348                         $queryInfo['conds'],
 349                         $queryInfo['join_conds'],
 350                         $queryInfo['options'],
 351                         $this->tagFilter
 352                 );
 353                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 354                 return $queryInfo;
 355         }
 356
 357         function getIndexField() {
 358                 return 'rev_timestamp';
 359         }
 360
 361         function formatRow( $row ) {
 362                 if ( $this->lastRow ) {
 363                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 364                         $firstInList = $this->counter == 1;
 365                         $this->counter++;
 366                         $s = $this->historyLine( $this->lastRow, $row,
 367                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 368                 } else {
 369                         $s = '';
 370                 }
 371                 $this->lastRow = $row;
 372                 return $s;
 373         }
 374
 375         /**
 376          * Creates begin of history list with a submit button
 377          *
 378          * @return string HTML output
 379          */
 380         function getStartBody() {
 381                 global $wgScript, $wgUser, $wgOut, $wgContLang;
 382                 $this->lastRow = false;
 383                 $this->counter = 1;
 384                 $this->oldIdChecked = 0;
 385
 386                 $wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 387                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 388                         'id' => 'mw-history-compare' ) ) . "\n";
 389                 $s .= Html::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
 390                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 391
 392                 $s .= '<div>' . $this->submitButton( wfMsg( 'compareselectedversions' ),
 393                         array( 'class' => 'historysubmit' ) ) . "\n";
 394
 395                 $this->buttons = '<div>';
 396                 $this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions' ),
 397                         array( 'class' => 'historysubmit' )
 398                                 + $wgUser->getSkin()->tooltipAndAccessKeyAttribs( 'compareselectedversions' )
 399                 ) . "\n";
 400
 401                 if ( $wgUser->isAllowed( 'deleterevision' ) ) {
 402                         $float = $wgContLang->alignEnd();
 403                         # Note bug #20966, <button> is non-standard in IE<8
 404                         $element = Html::element( 'button',
 405                                 array(
 406                                         'type' => 'submit',
 407                                         'name' => 'revisiondelete',
 408                                         'value' => '1',
 409                                         'style' => "float: $float;",
 410                                         'class' => 'mw-history-revisiondelete-button',
 411                                 ),
 412                                 wfMsg( 'showhideselectedversions' )
 413                         ) . "\n";
 414                         $s .= $element;
 415                         $this->buttons .= $element;
 416                 }
 417                 if ( $wgUser->isAllowed( 'revisionmove' ) ) {
 418                         $float = $wgContLang->alignEnd();
 419                         # Note bug #20966, <button> is non-standard in IE<8
 420                         $element = Html::element( 'button',
 421                                 array(
 422                                         'type' => 'submit',
 423                                         'name' => 'revisionmove',
 424                                         'value' => '1',
 425                                         'style' => "float: $float;",
 426                                         'class' => 'mw-history-revisionmove-button',
 427                                 ),
 428                                 wfMsg( 'revisionmoveselectedversions' )
 429                         ) . "\n";
 430                         $s .= $element;
 431                         $this->buttons .= $element;
 432                 }
 433                 $this->buttons .= '</div>';
 434                 $s .= '</div><ul id="pagehistory">' . "\n";
 435                 return $s;
 436         }
 437
 438         function getEndBody() {
 439                 if ( $this->lastRow ) {
 440                         $latest = $this->counter == 1 && $this->mIsFirst;
 441                         $firstInList = $this->counter == 1;
 442                         if ( $this->mIsBackwards ) {
 443                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 444                                 if ( $this->mOffset == '' ) {
 445                                         $next = null;
 446                                 } else {
 447                                         $next = 'unknown';
 448                                 }
 449                         } else {
 450                                 # The next row is the past-the-end row
 451                                 $next = $this->mPastTheEndRow;
 452                         }
 453                         $this->counter++;
 454                         $s = $this->historyLine( $this->lastRow, $next,
 455                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 456                 } else {
 457                         $s = '';
 458                 }
 459                 $s .= "</ul>\n";
 460                 # Add second buttons only if there is more than one rev
 461                 if ( $this->getNumRows() > 2 ) {
 462                         $s .= $this->buttons;
 463                 }
 464                 $s .= '</form>';
 465                 return $s;
 466         }
 467
 468         /**
 469          * Creates a submit button
 470          *
 471          * @param $message String: text of the submit button, will be escaped
 472          * @param $attributes Array: attributes
 473          * @return String: HTML output for the submit button
 474          */
 475         function submitButton( $message, $attributes = array() ) {
 476                 # Disable submit button if history has 1 revision only
 477                 if ( $this->getNumRows() > 1 ) {
 478                         return Xml::submitButton( $message , $attributes );
 479                 } else {
 480                         return '';
 481                 }
 482         }
 483
 484         /**
 485          * Returns a row from the history printout.
 486          *
 487          * @todo document some more, and maybe clean up the code (some params redundant?)
 488          *
 489          * @param $row Object: the database row corresponding to the previous line.
 490          * @param $next Mixed: the database row corresponding to the next line.
 491          * @param $notificationtimestamp
 492          * @param $latest Boolean: whether this row corresponds to the page's latest revision.
 493          * @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
 494          * @return String: HTML output for the row
 495          */
 496         function historyLine( $row, $next, $notificationtimestamp = false,
 497                 $latest = false, $firstInList = false )
 498         {
 499                 global $wgUser, $wgLang;
 500                 $rev = new Revision( $row );
 501                 $rev->setTitle( $this->title );
 502
 503                 $curlink = $this->curLink( $rev, $latest );
 504                 $lastlink = $this->lastLink( $rev, $next );
 505                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 506                 $histLinks = Html::rawElement(
 507                                 'span',
 508                                 array( 'class' => 'mw-history-histlinks' ),
 509                                 '(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
 510                 );
 511                 $s = $histLinks . $diffButtons;
 512
 513                 $link = $this->revLink( $rev );
 514                 $classes = array();
 515
 516                 $del = '';
 517                 // Show checkboxes for each revision
 518                 if ( $wgUser->isAllowed( 'deleterevision' ) || $wgUser->isAllowed( 'revisionmove' ) ) {
 519                         // If revision was hidden from sysops, disable the checkbox
 520                         // However, if the user has revisionmove rights, we cannot disable the checkbox
 521                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) && !$wgUser->isAllowed( 'revisionmove' ) ) {
 522                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 523                         // Otherwise, enable the checkbox...
 524                         } else {
 525                                 $del = Xml::check( 'showhiderevisions', false,
 526                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 527                         }
 528                 // User can only view deleted revisions...
 529                 } else if ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) {
 530                         // If revision was hidden from sysops, disable the link
 531                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 532                                 $cdel = $this->getSkin()->revDeleteLinkDisabled( false );
 533                         // Otherwise, show the link...
 534                         } else {
 535                                 $query = array( 'type' => 'revision',
 536                                         'target' => $this->title->getPrefixedDbkey(), 'ids' => $rev->getId() );
 537                                 $del .= $this->getSkin()->revDeleteLink( $query,
 538                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 539                         }
 540                 }
 541                 if ( $del ) {
 542                         $s .= " $del ";
 543                 }
 544
 545                 $s .= " $link";
 546                 $s .= " <span class='history-user'>" .
 547                         $this->getSkin()->revUserTools( $rev, true ) . "</span>";
 548
 549                 if ( $rev->isMinor() ) {
 550                         $s .= ' ' . ChangesList::flag( 'minor' );
 551                 }
 552
 553                 if ( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 554                         $s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
 555                 }
 556
 557                 $s .= $this->getSkin()->revComment( $rev, false, true );
 558
 559                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 560                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 561                 }
 562
 563                 $tools = array();
 564
 565                 # Rollback and undo links
 566                 if ( !is_null( $next ) && is_object( $next ) ) {
 567                         if ( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
 568                                 $tools[] = '<span class="mw-rollback-link">' .
 569                                         $this->getSkin()->buildRollbackLink( $rev ) . '</span>';
 570                         }
 571
 572                         if ( $this->title->quickUserCan( 'edit' )
 573                                 && !$rev->isDeleted( Revision::DELETED_TEXT )
 574                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 575                         {
 576                                 # Create undo tooltip for the first (=latest) line only
 577                                 $undoTooltip = $latest
 578                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 579                                         : array();
 580                                 $undolink = $this->getSkin()->link(
 581                                         $this->title,
 582                                         wfMsgHtml( 'editundo' ),
 583                                         $undoTooltip,
 584                                         array(
 585                                                 'action' => 'edit',
 586                                                 'undoafter' => $next->rev_id,
 587                                                 'undo' => $rev->getId()
 588                                         ),
 589                                         array( 'known', 'noclasses' )
 590                                 );
 591                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 592                         }
 593                 }
 594
 595                 if ( $tools ) {
 596                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 597                 }
 598
 599                 # Tags
 600                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 601                 $classes = array_merge( $classes, $newClasses );
 602                 $s .= " $tagSummary";
 603
 604                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
 605
 606                 $attribs = array();
 607                 if ( $classes ) {
 608                         $attribs['class'] = implode( ' ', $classes );
 609                 }
 610
 611                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 612         }
 613
 614         /**
 615          * Create a link to view this revision of the page
 616          *
 617          * @param $rev Revision
 618          * @return String
 619          */
 620         function revLink( $rev ) {
 621                 global $wgLang;
 622                 $date = $wgLang->timeanddate( wfTimestamp( TS_MW, $rev->getTimestamp() ), true );
 623                 $date = htmlspecialchars( $date );
 624                 if ( $rev->userCan( Revision::DELETED_TEXT ) ) {
 625                         $link = $this->getSkin()->link(
 626                                 $this->title,
 627                                 $date,
 628                                 array(),
 629                                 array( 'oldid' => $rev->getId() ),
 630                                 array( 'known', 'noclasses' )
 631                         );
 632                 } else {
 633                         $link = $date;
 634                 }
 635                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 636                         $link = "<span class=\"history-deleted\">$link</span>";
 637                 }
 638                 return $link;
 639         }
 640
 641         /**
 642          * Create a diff-to-current link for this revision for this page
 643          *
 644          * @param $rev Revision
 645          * @param $latest Boolean: this is the latest revision of the page?
 646          * @return String
 647          */
 648         function curLink( $rev, $latest ) {
 649                 $cur = $this->historyPage->message['cur'];
 650                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 651                         return $cur;
 652                 } else {
 653                         return $this->getSkin()->link(
 654                                 $this->title,
 655                                 $cur,
 656                                 array(),
 657                                 array(
 658                                         'diff' => $this->title->getLatestRevID(),
 659                                         'oldid' => $rev->getId()
 660                                 ),
 661                                 array( 'known', 'noclasses' )
 662                         );
 663                 }
 664         }
 665
 666         /**
 667          * Create a diff-to-previous link for this revision for this page.
 668          *
 669          * @param $prevRev Revision: the previous revision
 670          * @param $next Mixed: the newer revision
 671          * @return String
 672          */
 673         function lastLink( $prevRev, $next ) {
 674                 $last = $this->historyPage->message['last'];
 675                 # $next may either be a Row, null, or "unkown"
 676                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 677                 if ( is_null( $next ) ) {
 678                         # Probably no next row
 679                         return $last;
 680                 } elseif ( $next === 'unknown' ) {
 681                         # Next row probably exists but is unknown, use an oldid=prev link
 682                         return $this->getSkin()->link(
 683                                 $this->title,
 684                                 $last,
 685                                 array(),
 686                                 array(
 687                                         'diff' => $prevRev->getId(),
 688                                         'oldid' => 'prev'
 689                                 ),
 690                                 array( 'known', 'noclasses' )
 691                         );
 692                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT )
 693                         || !$nextRev->userCan( Revision::DELETED_TEXT ) )
 694                 {
 695                         return $last;
 696                 } else {
 697                         return $this->getSkin()->link(
 698                                 $this->title,
 699                                 $last,
 700                                 array(),
 701                                 array(
 702                                         'diff' => $prevRev->getId(),
 703                                         'oldid' => $next->rev_id
 704                                 ),
 705                                 array( 'known', 'noclasses' )
 706                         );
 707                 }
 708         }
 709
 710         /**
 711          * Create radio buttons for page history
 712          *
 713          * @param $rev Revision object
 714          * @param $firstInList Boolean: is this version the first one?
 715          *
 716          * @return String: HTML output for the radio buttons
 717          */
 718         function diffButtons( $rev, $firstInList ) {
 719                 if ( $this->getNumRows() > 1 ) {
 720                         $id = $rev->getId();
 721                         $radio = array( 'type'  => 'radio', 'value' => $id );
 722                         /** @todo: move title texts to javascript */
 723                         if ( $firstInList ) {
 724                                 $first = Xml::element( 'input',
 725                                         array_merge( $radio, array(
 726                                                 'style' => 'visibility:hidden',
 727                                                 'name'  => 'oldid',
 728                                                 'id' => 'mw-oldid-null' ) )
 729                                 );
 730                                 $checkmark = array( 'checked' => 'checked' );
 731                         } else {
 732                                 # Check visibility of old revisions
 733                                 if ( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 734                                         $radio['disabled'] = 'disabled';
 735                                         $checkmark = array(); // We will check the next possible one
 736                                 } else if ( !$this->oldIdChecked ) {
 737                                         $checkmark = array( 'checked' => 'checked' );
 738                                         $this->oldIdChecked = $id;
 739                                 } else {
 740                                         $checkmark = array();
 741                                 }
 742                                 $first = Xml::element( 'input',
 743                                         array_merge( $radio, $checkmark, array(
 744                                                 'name'  => 'oldid',
 745                                                 'id' => "mw-oldid-$id" ) ) );
 746                                 $checkmark = array();
 747                         }
 748                         $second = Xml::element( 'input',
 749                                 array_merge( $radio, $checkmark, array(
 750                                         'name'  => 'diff',
 751                                         'id' => "mw-diff-$id" ) ) );
 752                         return $first . $second;
 753                 } else {
 754                         return '';
 755                 }
 756         }
 757 }
 758
 759 /**
 760  * Backwards-compatibility aliases
 761  */
 762 class PageHistory extends HistoryPage {}
 763 class PageHistoryPager extends HistoryPager {}