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          */
  29         function __construct( $article ) {
  30                 global $wgUser;
  31                 $this->article = $article;
  32                 $this->title = $article->getTitle();
  33                 $this->skin = $wgUser->getSkin();
  34                 $this->preCacheMessages();
  35         }
  36
  37         function getArticle() {
  38                 return $this->article;
  39         }
  40
  41         function getTitle() {
  42                 return $this->title;
  43         }
  44
  45         /**
  46          * As we use the same small set of messages in various methods and that
  47          * they are called often, we call them once and save them in $this->message
  48          */
  49         function preCacheMessages() {
  50                 // Precache various messages
  51                 if ( !isset( $this->message ) ) {
  52                         $msgs = array( 'cur', 'last', 'pipe-separator' );
  53                         foreach ( $msgs as $msg ) {
  54                                 $this->message[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
  55                         }
  56                 }
  57         }
  58
  59         /**
  60          * Print the history page for an article.
  61          * @return nothing
  62          */
  63         function history() {
  64                 global $wgOut, $wgRequest, $wgScript;
  65
  66                 /*
  67                  * Allow client caching.
  68                  */
  69                 if ( $wgOut->checkLastModified( $this->article->getTouched() ) )
  70                         return; // Client cache fresh and headers sent, nothing more to do.
  71
  72                 wfProfileIn( __METHOD__ );
  73
  74                 /*
  75                  * Setup page variables.
  76                  */
  77                 $wgOut->setPageTitle( wfMsg( 'history-title', $this->title->getPrefixedText() ) );
  78                 $wgOut->setPageTitleActionText( wfMsg( 'history_short' ) );
  79                 $wgOut->setArticleFlag( false );
  80                 $wgOut->setArticleRelated( true );
  81                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
  82                 $wgOut->setSyndicated( true );
  83                 $wgOut->setFeedAppendQuery( 'action=history' );
  84                 $wgOut->addModules( array( 'mediawiki.legacy.history', 'mediawiki.views.history' ) );
  85
  86                 $logPage = SpecialPage::getTitleFor( 'Log' );
  87                 $logLink = $this->skin->link(
  88                         $logPage,
  89                         wfMsgHtml( 'viewpagelogs' ),
  90                         array(),
  91                         array( 'page' => $this->title->getPrefixedText() ),
  92                         array( 'known', 'noclasses' )
  93                 );
  94                 $wgOut->setSubtitle( $logLink );
  95
  96                 $feedType = $wgRequest->getVal( 'feed' );
  97                 if ( $feedType ) {
  98                         wfProfileOut( __METHOD__ );
  99                         return $this->feed( $feedType );
 100                 }
 101
 102                 /*
 103                  * Fail if article doesn't exist.
 104                  */
 105                 if ( !$this->title->exists() ) {
 106                         $wgOut->addWikiMsg( 'nohistory' );
 107                         # show deletion/move log if there is an entry
 108                         LogEventsList::showLogExtract(
 109                                 $wgOut,
 110                                 array( 'delete', 'move' ),
 111                                 $this->title->getPrefixedText(),
 112                                 '',
 113                                 array(  'lim' => 10,
 114                                         'conds' => array( "log_action != 'revision'" ),
 115                                         'showIfEmpty' => false,
 116                                         'msgKey' => array( 'moveddeleted-notice' )
 117                                 )
 118                         );
 119                         wfProfileOut( __METHOD__ );
 120                         return;
 121                 }
 122
 123                 /**
 124                  * Add date selector to quickly get to a certain time
 125                  */
 126                 $year = $wgRequest->getInt( 'year' );
 127                 $month = $wgRequest->getInt( 'month' );
 128                 $tagFilter = $wgRequest->getVal( 'tagfilter' );
 129                 $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );
 130                 /**
 131                  * Option to show only revisions that have been (partially) hidden via RevisionDelete
 132                  */
 133                 if ( $wgRequest->getBool( 'deleted' ) ) {
 134                         $conds = array( "rev_deleted != '0'" );
 135                 } else {
 136                         $conds = array();
 137                 }
 138                 $checkDeleted = Xml::checkLabel( wfMsg( 'history-show-deleted' ),
 139                         'deleted', 'mw-show-deleted-only', $wgRequest->getBool( 'deleted' ) ) . "\n";
 140
 141                 $action = htmlspecialchars( $wgScript );
 142                 $wgOut->addHTML(
 143                         "<form action=\"$action\" method=\"get\" id=\"mw-history-searchform\">" .
 144                         Xml::fieldset(
 145                                 wfMsg( 'history-fieldset-title' ),
 146                                 false,
 147                                 array( 'id' => 'mw-history-search' )
 148                         ) .
 149                         Html::hidden( 'title', $this->title->getPrefixedDBKey() ) . "\n" .
 150                         Html::hidden( 'action', 'history' ) . "\n" .
 151                         Xml::dateMenu( $year, $month ) . '&#160;' .
 152                         ( $tagSelector ? ( implode( '&#160;', $tagSelector ) . '&#160;' ) : '' ) .
 153                         $checkDeleted .
 154                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) . "\n" .
 155                         '</fieldset></form>'
 156                 );
 157
 158                 wfRunHooks( 'PageHistoryBeforeList', array( &$this->article ) );
 159
 160                 /**
 161                  * Do the list
 162                  */
 163                 $pager = new HistoryPager( $this, $year, $month, $tagFilter, $conds );
 164                 $wgOut->addHTML(
 165                         $pager->getNavigationBar() .
 166                         $pager->getBody() .
 167                         $pager->getNavigationBar()
 168                 );
 169
 170                 wfProfileOut( __METHOD__ );
 171         }
 172
 173         /**
 174          * Fetch an array of revisions, specified by a given limit, offset and
 175          * direction. This is now only used by the feeds. It was previously
 176          * used by the main UI but that's now handled by the pager.
 177          *
 178          * @param $limit Integer: the limit number of revisions to get
 179          * @param $offset Integer
 180          * @param $direction Integer: either HistoryPage::DIR_PREV or HistoryPage::DIR_NEXT
 181          * @return ResultWrapper
 182          */
 183         function fetchRevisions( $limit, $offset, $direction ) {
 184                 $dbr = wfGetDB( DB_SLAVE );
 185
 186                 if ( $direction == HistoryPage::DIR_PREV ) {
 187                         list( $dirs, $oper ) = array( "ASC", ">=" );
 188                 } else { /* $direction == HistoryPage::DIR_NEXT */
 189                         list( $dirs, $oper ) = array( "DESC", "<=" );
 190                 }
 191
 192                 if ( $offset ) {
 193                         $offsets = array( "rev_timestamp $oper '$offset'" );
 194                 } else {
 195                         $offsets = array();
 196                 }
 197
 198                 $page_id = $this->title->getArticleID();
 199
 200                 return $dbr->select( 'revision',
 201                         Revision::selectFields(),
 202                         array_merge( array( "rev_page=$page_id" ), $offsets ),
 203                         __METHOD__,
 204                         array( 'ORDER BY' => "rev_timestamp $dirs",
 205                                 'USE INDEX' => 'page_timestamp', 'LIMIT' => $limit )
 206                 );
 207         }
 208
 209         /**
 210          * Output a subscription feed listing recent edits to this page.
 211          *
 212          * @param $type String: feed type
 213          */
 214         function feed( $type ) {
 215                 global $wgFeedClasses, $wgRequest, $wgFeedLimit;
 216                 if ( !FeedUtils::checkFeedOutput( $type ) ) {
 217                         return;
 218                 }
 219
 220                 $feed = new $wgFeedClasses[$type](
 221                         $this->title->getPrefixedText() . ' - ' .
 222                         wfMsgForContent( 'history-feed-title' ),
 223                         wfMsgForContent( 'history-feed-description' ),
 224                         $this->title->getFullUrl( 'action=history' )
 225                 );
 226
 227                 // Get a limit on number of feed entries. Provide a sane default
 228                 // of 10 if none is defined (but limit to $wgFeedLimit max)
 229                 $limit = $wgRequest->getInt( 'limit', 10 );
 230                 if ( $limit > $wgFeedLimit || $limit < 1 ) {
 231                         $limit = 10;
 232                 }
 233                 $items = $this->fetchRevisions( $limit, 0, HistoryPage::DIR_NEXT );
 234
 235                 $feed->outHeader();
 236                 if ( $items ) {
 237                         foreach ( $items as $row ) {
 238                                 $feed->outItem( $this->feedItem( $row ) );
 239                         }
 240                 } else {
 241                         $feed->outItem( $this->feedEmpty() );
 242                 }
 243                 $feed->outFooter();
 244         }
 245
 246         function feedEmpty() {
 247                 global $wgOut;
 248                 return new FeedItem(
 249                         wfMsgForContent( 'nohistory' ),
 250                         $wgOut->parse( wfMsgForContent( 'history-feed-empty' ) ),
 251                         $this->title->getFullUrl(),
 252                         wfTimestamp( TS_MW ),
 253                         '',
 254                         $this->title->getTalkPage()->getFullUrl()
 255                 );
 256         }
 257
 258         /**
 259          * Generate a FeedItem object from a given revision table row
 260          * Borrows Recent Changes' feed generation functions for formatting;
 261          * includes a diff to the previous revision (if any).
 262          *
 263          * @param $row Object: database row
 264          * @return FeedItem
 265          */
 266         function feedItem( $row ) {
 267                 $rev = new Revision( $row );
 268                 $rev->setTitle( $this->title );
 269                 $text = FeedUtils::formatDiffRow(
 270                         $this->title,
 271                         $this->title->getPreviousRevisionID( $rev->getId() ),
 272                         $rev->getId(),
 273                         $rev->getTimestamp(),
 274                         $rev->getComment()
 275                 );
 276                 if ( $rev->getComment() == '' ) {
 277                         global $wgContLang;
 278                         $title = wfMsgForContent( 'history-feed-item-nocomment',
 279                                 $rev->getUserText(),
 280                                 $wgContLang->timeanddate( $rev->getTimestamp() ),
 281                                 $wgContLang->date( $rev->getTimestamp() ),
 282                                 $wgContLang->time( $rev->getTimestamp() )
 283                         );
 284                 } else {
 285                         $title = $rev->getUserText() .
 286                         wfMsgForContent( 'colon-separator' ) .
 287                         FeedItem::stripComment( $rev->getComment() );
 288                 }
 289                 return new FeedItem(
 290                         $title,
 291                         $text,
 292                         $this->title->getFullUrl( 'diff=' . $rev->getId() . '&oldid=prev' ),
 293                         $rev->getTimestamp(),
 294                         $rev->getUserText(),
 295                         $this->title->getTalkPage()->getFullUrl()
 296                 );
 297         }
 298 }
 299
 300 /**
 301  * @ingroup Pager
 302  */
 303 class HistoryPager extends ReverseChronologicalPager {
 304         public $lastRow = false, $counter, $historyPage, $title, $buttons, $conds;
 305         protected $oldIdChecked;
 306
 307         function __construct( $historyPage, $year = '', $month = '', $tagFilter = '', $conds = array() ) {
 308                 parent::__construct();
 309                 $this->historyPage = $historyPage;
 310                 $this->title = $this->historyPage->title;
 311                 $this->tagFilter = $tagFilter;
 312                 $this->getDateCond( $year, $month );
 313                 $this->conds = $conds;
 314         }
 315
 316         // For hook compatibility...
 317         function getArticle() {
 318                 return $this->historyPage->getArticle();
 319         }
 320
 321         function getSqlComment() {
 322                 if ( $this->conds ) {
 323                         return 'history page filtered'; // potentially slow, see CR r58153
 324                 } else {
 325                         return 'history page unfiltered';
 326                 }
 327         }
 328
 329         function getQueryInfo() {
 330                 $queryInfo = array(
 331                         'tables'  => array( 'revision' ),
 332                         'fields'  => Revision::selectFields(),
 333                         'conds'   => array_merge(
 334                                 array( 'rev_page' => $this->historyPage->title->getArticleID() ),
 335                                 $this->conds ),
 336                         'options' => array( 'USE INDEX' => array( 'revision' => 'page_timestamp' ) ),
 337                         'join_conds' => array( 'tag_summary' => array( 'LEFT JOIN', 'ts_rev_id=rev_id' ) ),
 338                 );
 339                 ChangeTags::modifyDisplayQuery(
 340                         $queryInfo['tables'],
 341                         $queryInfo['fields'],
 342                         $queryInfo['conds'],
 343                         $queryInfo['join_conds'],
 344                         $queryInfo['options'],
 345                         $this->tagFilter
 346                 );
 347                 wfRunHooks( 'PageHistoryPager::getQueryInfo', array( &$this, &$queryInfo ) );
 348                 return $queryInfo;
 349         }
 350
 351         function getIndexField() {
 352                 return 'rev_timestamp';
 353         }
 354
 355         function formatRow( $row ) {
 356                 if ( $this->lastRow ) {
 357                         $latest = ( $this->counter == 1 && $this->mIsFirst );
 358                         $firstInList = $this->counter == 1;
 359                         $this->counter++;
 360                         $s = $this->historyLine( $this->lastRow, $row,
 361                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 362                 } else {
 363                         $s = '';
 364                 }
 365                 $this->lastRow = $row;
 366                 return $s;
 367         }
 368
 369         /**
 370          * Creates begin of history list with a submit button
 371          *
 372          * @return string HTML output
 373          */
 374         function getStartBody() {
 375                 global $wgScript, $wgUser, $wgOut, $wgContLang;
 376                 $this->lastRow = false;
 377                 $this->counter = 1;
 378                 $this->oldIdChecked = 0;
 379
 380                 $wgOut->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 381                 $s = Html::openElement( 'form', array( 'action' => $wgScript,
 382                         'id' => 'mw-history-compare' ) ) . "\n";
 383                 $s .= Html::hidden( 'title', $this->title->getPrefixedDbKey() ) . "\n";
 384                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 385
 386                 $s .= '<div>' . $this->submitButton( wfMsg( 'compareselectedversions' ),
 387                         array( 'class' => 'historysubmit' ) ) . "\n";
 388
 389                 $this->buttons = '<div>';
 390                 $this->buttons .= $this->submitButton( wfMsg( 'compareselectedversions' ),
 391                         array( 'class' => 'historysubmit' )
 392                                 + $wgUser->getSkin()->tooltipAndAccessKeyAttribs( 'compareselectedversions' )
 393                 ) . "\n";
 394
 395                 if ( $wgUser->isAllowed( 'deleterevision' ) ) {
 396                         $float = $wgContLang->alignEnd();
 397                         # Note bug #20966, <button> is non-standard in IE<8
 398                         $element = Html::element( 'button',
 399                                 array(
 400                                         'type' => 'submit',
 401                                         'name' => 'revisiondelete',
 402                                         'value' => '1',
 403                                         'style' => "float: $float;",
 404                                         'class' => 'mw-history-revisiondelete-button',
 405                                 ),
 406                                 wfMsg( 'showhideselectedversions' )
 407                         ) . "\n";
 408                         $s .= $element;
 409                         $this->buttons .= $element;
 410                 }
 411                 if ( $wgUser->isAllowed( 'revisionmove' ) ) {
 412                         $float = $wgContLang->alignEnd();
 413                         # Note bug #20966, <button> is non-standard in IE<8
 414                         $element = Html::element( 'button',
 415                                 array(
 416                                         'type' => 'submit',
 417                                         'name' => 'revisionmove',
 418                                         'value' => '1',
 419                                         'style' => "float: $float;",
 420                                         'class' => 'mw-history-revisionmove-button',
 421                                 ),
 422                                 wfMsg( 'revisionmoveselectedversions' )
 423                         ) . "\n";
 424                         $s .= $element;
 425                         $this->buttons .= $element;
 426                 }
 427                 $this->buttons .= '</div>';
 428                 $s .= '</div><ul id="pagehistory">' . "\n";
 429                 return $s;
 430         }
 431
 432         function getEndBody() {
 433                 if ( $this->lastRow ) {
 434                         $latest = $this->counter == 1 && $this->mIsFirst;
 435                         $firstInList = $this->counter == 1;
 436                         if ( $this->mIsBackwards ) {
 437                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 438                                 if ( $this->mOffset == '' ) {
 439                                         $next = null;
 440                                 } else {
 441                                         $next = 'unknown';
 442                                 }
 443                         } else {
 444                                 # The next row is the past-the-end row
 445                                 $next = $this->mPastTheEndRow;
 446                         }
 447                         $this->counter++;
 448                         $s = $this->historyLine( $this->lastRow, $next,
 449                                 $this->title->getNotificationTimestamp(), $latest, $firstInList );
 450                 } else {
 451                         $s = '';
 452                 }
 453                 $s .= "</ul>\n";
 454                 # Add second buttons only if there is more than one rev
 455                 if ( $this->getNumRows() > 2 ) {
 456                         $s .= $this->buttons;
 457                 }
 458                 $s .= '</form>';
 459                 return $s;
 460         }
 461
 462         /**
 463          * Creates a submit button
 464          *
 465          * @param $message String: text of the submit button, will be escaped
 466          * @param $attributes Array: attributes
 467          * @return String: HTML output for the submit button
 468          */
 469         function submitButton( $message, $attributes = array() ) {
 470                 # Disable submit button if history has 1 revision only
 471                 if ( $this->getNumRows() > 1 ) {
 472                         return Xml::submitButton( $message , $attributes );
 473                 } else {
 474                         return '';
 475                 }
 476         }
 477
 478         /**
 479          * Returns a row from the history printout.
 480          *
 481          * @todo document some more, and maybe clean up the code (some params redundant?)
 482          *
 483          * @param $row Object: the database row corresponding to the previous line.
 484          * @param $next Mixed: the database row corresponding to the next line.
 485          * @param $notificationtimestamp
 486          * @param $latest Boolean: whether this row corresponds to the page's latest revision.
 487          * @param $firstInList Boolean: whether this row corresponds to the first displayed on this history page.
 488          * @return String: HTML output for the row
 489          */
 490         function historyLine( $row, $next, $notificationtimestamp = false,
 491                 $latest = false, $firstInList = false )
 492         {
 493                 global $wgUser, $wgLang;
 494                 $rev = new Revision( $row );
 495                 $rev->setTitle( $this->title );
 496
 497                 $curlink = $this->curLink( $rev, $latest );
 498                 $lastlink = $this->lastLink( $rev, $next );
 499                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 500                 $histLinks = Html::rawElement(
 501                                 'span',
 502                                 array( 'class' => 'mw-history-histlinks' ),
 503                                 '(' . $curlink . $this->historyPage->message['pipe-separator'] . $lastlink . ') '
 504                 );
 505                 $s = $histLinks . $diffButtons;
 506
 507                 $link = $this->revLink( $rev );
 508                 $classes = array();
 509
 510                 $del = '';
 511                 // Show checkboxes for each revision
 512                 if ( $wgUser->isAllowed( 'deleterevision' ) || $wgUser->isAllowed( 'revisionmove' ) ) {
 513                         // If revision was hidden from sysops, disable the checkbox
 514                         // However, if the user has revisionmove rights, we cannot disable the checkbox
 515                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) && !$wgUser->isAllowed( 'revisionmove' ) ) {
 516                                 $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
 517                         // Otherwise, enable the checkbox...
 518                         } else {
 519                                 $del = Xml::check( 'showhiderevisions', false,
 520                                         array( 'name' => 'ids[' . $rev->getId() . ']' ) );
 521                         }
 522                 // User can only view deleted revisions...
 523                 } else if ( $rev->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) {
 524                         // If revision was hidden from sysops, disable the link
 525                         if ( !$rev->userCan( Revision::DELETED_RESTRICTED ) ) {
 526                                 $cdel = $this->getSkin()->revDeleteLinkDisabled( false );
 527                         // Otherwise, show the link...
 528                         } else {
 529                                 $query = array( 'type' => 'revision',
 530                                         'target' => $this->title->getPrefixedDbkey(), 'ids' => $rev->getId() );
 531                                 $del .= $this->getSkin()->revDeleteLink( $query,
 532                                         $rev->isDeleted( Revision::DELETED_RESTRICTED ), false );
 533                         }
 534                 }
 535                 if ( $del ) {
 536                         $s .= " $del ";
 537                 }
 538
 539                 $s .= " $link";
 540                 $s .= " <span class='history-user'>" .
 541                         $this->getSkin()->revUserTools( $rev, true ) . "</span>";
 542
 543                 if ( $rev->isMinor() ) {
 544                         $s .= ' ' . ChangesList::flag( 'minor' );
 545                 }
 546
 547                 if ( !is_null( $size = $rev->getSize() ) && !$rev->isDeleted( Revision::DELETED_TEXT ) ) {
 548                         $s .= ' ' . $this->getSkin()->formatRevisionSize( $size );
 549                 }
 550
 551                 $s .= $this->getSkin()->revComment( $rev, false, true );
 552
 553                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 554                         $s .= ' <span class="updatedmarker">' .  wfMsgHtml( 'updatedmarker' ) . '</span>';
 555                 }
 556
 557                 $tools = array();
 558
 559                 # Rollback and undo links
 560                 if ( !is_null( $next ) && is_object( $next ) ) {
 561                         if ( $latest && $this->title->userCan( 'rollback' ) && $this->title->userCan( 'edit' ) ) {
 562                                 $tools[] = '<span class="mw-rollback-link">' .
 563                                         $this->getSkin()->buildRollbackLink( $rev ) . '</span>';
 564                         }
 565
 566                         if ( $this->title->quickUserCan( 'edit' )
 567                                 && !$rev->isDeleted( Revision::DELETED_TEXT )
 568                                 && !$next->rev_deleted & Revision::DELETED_TEXT )
 569                         {
 570                                 # Create undo tooltip for the first (=latest) line only
 571                                 $undoTooltip = $latest
 572                                         ? array( 'title' => wfMsg( 'tooltip-undo' ) )
 573                                         : array();
 574                                 $undolink = $this->getSkin()->link(
 575                                         $this->title,
 576                                         wfMsgHtml( 'editundo' ),
 577                                         $undoTooltip,
 578                                         array(
 579                                                 'action' => 'edit',
 580                                                 'undoafter' => $next->rev_id,
 581                                                 'undo' => $rev->getId()
 582                                         ),
 583                                         array( 'known', 'noclasses' )
 584                                 );
 585                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 586                         }
 587                 }
 588
 589                 if ( $tools ) {
 590                         $s .= ' (' . $wgLang->pipeList( $tools ) . ')';
 591                 }
 592
 593                 # Tags
 594                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'history' );
 595                 $classes = array_merge( $classes, $newClasses );
 596                 $s .= " $tagSummary";
 597
 598                 wfRunHooks( 'PageHistoryLineEnding', array( $this, &$row , &$s, &$classes ) );
 599
 600                 $attribs = array();
 601                 if ( $classes ) {
 602                         $attribs['class'] = implode( ' ', $classes );
 603                 }
 604
 605                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 606         }
 607
 608         /**
 609          * Create a link to view this revision of the page
 610          *
 611          * @param $rev Revision
 612          * @return String
 613          */
 614         function revLink( $rev ) {
 615                 global $wgLang;
 616                 $date = $wgLang->timeanddate( wfTimestamp( TS_MW, $rev->getTimestamp() ), true );
 617                 $date = htmlspecialchars( $date );
 618                 if ( $rev->userCan( Revision::DELETED_TEXT ) ) {
 619                         $link = $this->getSkin()->link(
 620                                 $this->title,
 621                                 $date,
 622                                 array(),
 623                                 array( 'oldid' => $rev->getId() ),
 624                                 array( 'known', 'noclasses' )
 625                         );
 626                 } else {
 627                         $link = $date;
 628                 }
 629                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 630                         $link = "<span class=\"history-deleted\">$link</span>";
 631                 }
 632                 return $link;
 633         }
 634
 635         /**
 636          * Create a diff-to-current link for this revision for this page
 637          *
 638          * @param $rev Revision
 639          * @param $latest Boolean: this is the latest revision of the page?
 640          * @return String
 641          */
 642         function curLink( $rev, $latest ) {
 643                 $cur = $this->historyPage->message['cur'];
 644                 if ( $latest || !$rev->userCan( Revision::DELETED_TEXT ) ) {
 645                         return $cur;
 646                 } else {
 647                         return $this->getSkin()->link(
 648                                 $this->title,
 649                                 $cur,
 650                                 array(),
 651                                 array(
 652                                         'diff' => $this->title->getLatestRevID(),
 653                                         'oldid' => $rev->getId()
 654                                 ),
 655                                 array( 'known', 'noclasses' )
 656                         );
 657                 }
 658         }
 659
 660         /**
 661          * Create a diff-to-previous link for this revision for this page.
 662          *
 663          * @param $prevRev Revision: the previous revision
 664          * @param $next Mixed: the newer revision
 665          * @return String
 666          */
 667         function lastLink( $prevRev, $next ) {
 668                 $last = $this->historyPage->message['last'];
 669                 # $next may either be a Row, null, or "unkown"
 670                 $nextRev = is_object( $next ) ? new Revision( $next ) : $next;
 671                 if ( is_null( $next ) ) {
 672                         # Probably no next row
 673                         return $last;
 674                 } elseif ( $next === 'unknown' ) {
 675                         # Next row probably exists but is unknown, use an oldid=prev link
 676                         return $this->getSkin()->link(
 677                                 $this->title,
 678                                 $last,
 679                                 array(),
 680                                 array(
 681                                         'diff' => $prevRev->getId(),
 682                                         'oldid' => 'prev'
 683                                 ),
 684                                 array( 'known', 'noclasses' )
 685                         );
 686                 } elseif ( !$prevRev->userCan( Revision::DELETED_TEXT )
 687                         || !$nextRev->userCan( Revision::DELETED_TEXT ) )
 688                 {
 689                         return $last;
 690                 } else {
 691                         return $this->getSkin()->link(
 692                                 $this->title,
 693                                 $last,
 694                                 array(),
 695                                 array(
 696                                         'diff' => $prevRev->getId(),
 697                                         'oldid' => $next->rev_id
 698                                 ),
 699                                 array( 'known', 'noclasses' )
 700                         );
 701                 }
 702         }
 703
 704         /**
 705          * Create radio buttons for page history
 706          *
 707          * @param $rev Revision object
 708          * @param $firstInList Boolean: is this version the first one?
 709          *
 710          * @return String: HTML output for the radio buttons
 711          */
 712         function diffButtons( $rev, $firstInList ) {
 713                 if ( $this->getNumRows() > 1 ) {
 714                         $id = $rev->getId();
 715                         $radio = array( 'type'  => 'radio', 'value' => $id );
 716                         /** @todo: move title texts to javascript */
 717                         if ( $firstInList ) {
 718                                 $first = Xml::element( 'input',
 719                                         array_merge( $radio, array(
 720                                                 'style' => 'visibility:hidden',
 721                                                 'name'  => 'oldid',
 722                                                 'id' => 'mw-oldid-null' ) )
 723                                 );
 724                                 $checkmark = array( 'checked' => 'checked' );
 725                         } else {
 726                                 # Check visibility of old revisions
 727                                 if ( !$rev->userCan( Revision::DELETED_TEXT ) ) {
 728                                         $radio['disabled'] = 'disabled';
 729                                         $checkmark = array(); // We will check the next possible one
 730                                 } else if ( !$this->oldIdChecked ) {
 731                                         $checkmark = array( 'checked' => 'checked' );
 732                                         $this->oldIdChecked = $id;
 733                                 } else {
 734                                         $checkmark = array();
 735                                 }
 736                                 $first = Xml::element( 'input',
 737                                         array_merge( $radio, $checkmark, array(
 738                                                 'name'  => 'oldid',
 739                                                 'id' => "mw-oldid-$id" ) ) );
 740                                 $checkmark = array();
 741                         }
 742                         $second = Xml::element( 'input',
 743                                 array_merge( $radio, $checkmark, array(
 744                                         'name'  => 'diff',
 745                                         'id' => "mw-diff-$id" ) ) );
 746                         return $first . $second;
 747                 } else {
 748                         return '';
 749                 }
 750         }
 751 }
 752
 753 /**
 754  * Backwards-compatibility aliases
 755  */
 756 class PageHistory extends HistoryPage {}
 757 class PageHistoryPager extends HistoryPager {}