includes/diff/DifferenceInterface.php

   1 <?php
   2 /**
   3  * @defgroup DifferenceEngine DifferenceEngine
   4  */
   5
   6 /**
   7  * Constant to indicate diff cache compatibility.
   8  * Bump this when changing the diff formatting in a way that
   9  * fixes important bugs or such to force cached diff views to
  10  * clear.
  11  */
  12 define( 'MW_DIFF_VERSION', '1.11a' );
  13
  14 /**
  15  * @todo document
  16  * @ingroup DifferenceEngine
  17  */
  18 class DifferenceEngine {
  19         /**#@+
  20          * @private
  21          */
  22         var $mOldid, $mNewid, $mTitle;
  23         var $mOldtitle, $mNewtitle, $mPagetitle;
  24         var $mOldtext, $mNewtext;
  25         var $mOldPage, $mNewPage;
  26         var $mRcidMarkPatrolled;
  27         var $mOldRev, $mNewRev;
  28         var $mRevisionsLoaded = false; // Have the revisions been loaded
  29         var $mTextLoaded = 0; // How many text blobs have been loaded, 0, 1 or 2?
  30         var $mCacheHit = false; // Was the diff fetched from cache?
  31         var $htmldiff;
  32
  33         /**
  34          * Set this to true to add debug info to the HTML output.
  35          * Warning: this may cause RSS readers to spuriously mark articles as "new"
  36          * (bug 20601)
  37          */
  38         var $enableDebugComment = false;
  39
  40         // If true, line X is not displayed when X is 1, for example to increase
  41         // readability and conserve space with many small diffs.
  42         protected $mReducedLineNumbers = false;
  43
  44         protected $unhide = false;
  45         /**#@-*/
  46
  47         /**
  48          * Constructor
  49          * @param $titleObj Title object that the diff is associated with
  50          * @param $old Integer: old ID we want to show and diff with.
  51          * @param $new String: either 'prev' or 'next'.
  52          * @param $rcid Integer: ??? FIXME (default 0)
  53          * @param $refreshCache boolean If set, refreshes the diff cache
  54          * @param $htmldiff boolean If set, output using HTMLDiff instead of raw wikicode diff
  55          * @param $unhide boolean If set, allow viewing deleted revs
  56          */
  57         function __construct( $titleObj = null, $old = 0, $new = 0, $rcid = 0,
  58                 $refreshCache = false, $htmldiff = false, $unhide = false )
  59         {
  60                 if ( $titleObj ) {
  61                         $this->mTitle = $titleObj;
  62                 } else {
  63                         global $wgTitle;
  64                         $this->mTitle = $wgTitle;
  65                 }
  66                 wfDebug("DifferenceEngine old '$old' new '$new' rcid '$rcid'\n");
  67
  68                 if ( 'prev' === $new ) {
  69                         # Show diff between revision $old and the previous one.
  70                         # Get previous one from DB.
  71                         $this->mNewid = intval($old);
  72                         $this->mOldid = $this->mTitle->getPreviousRevisionID( $this->mNewid );
  73                 } elseif ( 'next' === $new ) {
  74                         # Show diff between revision $old and the next one.
  75                         # Get next one from DB.
  76                         $this->mOldid = intval($old);
  77                         $this->mNewid = $this->mTitle->getNextRevisionID( $this->mOldid );
  78                         if ( false === $this->mNewid ) {
  79                                 # if no result, NewId points to the newest old revision. The only newer
  80                                 # revision is cur, which is "0".
  81                                 $this->mNewid = 0;
  82                         }
  83                 } else {
  84                         $this->mOldid = intval($old);
  85                         $this->mNewid = intval($new);
  86                         wfRunHooks( 'NewDifferenceEngine', array(&$titleObj, &$this->mOldid, &$this->mNewid, $old, $new) );
  87                 }
  88                 $this->mRcidMarkPatrolled = intval($rcid);  # force it to be an integer
  89                 $this->mRefreshCache = $refreshCache;
  90                 $this->htmldiff = $htmldiff;
  91                 $this->unhide = $unhide;
  92         }
  93
  94         function setReducedLineNumbers( $value = true ) {
  95                 $this->mReducedLineNumbers = $value;
  96         }
  97
  98         function getTitle() {
  99                 return $this->mTitle;
 100         }
 101
 102         function wasCacheHit() {
 103                 return $this->mCacheHit;
 104         }
 105
 106         function getOldid() {
 107                 return $this->mOldid;
 108         }
 109
 110         function getNewid() {
 111                 return $this->mNewid;
 112         }
 113
 114         function showDiffPage( $diffOnly = false ) {
 115                 global $wgUser, $wgOut, $wgUseExternalEditor, $wgUseRCPatrol, $wgEnableHtmlDiff;
 116                 wfProfileIn( __METHOD__ );
 117
 118
 119                 # If external diffs are enabled both globally and for the user,
 120                 # we'll use the application/x-external-editor interface to call
 121                 # an external diff tool like kompare, kdiff3, etc.
 122                 if($wgUseExternalEditor && $wgUser->getOption('externaldiff')) {
 123                         global $wgInputEncoding,$wgServer,$wgScript,$wgLang;
 124                         $wgOut->disable();
 125                         header ( "Content-type: application/x-external-editor; charset=".$wgInputEncoding );
 126                         $url1=$this->mTitle->getFullURL( array(
 127                                 'action' => 'raw',
 128                                 'oldid' => $this->mOldid
 129                         ) );
 130                         $url2=$this->mTitle->getFullURL( array(
 131                                 'action' => 'raw',
 132                                 'oldid' => $this->mNewid
 133                         ) );
 134                         $special=$wgLang->getNsText(NS_SPECIAL);
 135                         $control=<<<CONTROL
 136                         [Process]
 137                         Type=Diff text
 138                         Engine=MediaWiki
 139                         Script={$wgServer}{$wgScript}
 140                         Special namespace={$special}
 141
 142                         [File]
 143                         Extension=wiki
 144                         URL=$url1
 145
 146                         [File 2]
 147                         Extension=wiki
 148                         URL=$url2
 149 CONTROL;
 150                         echo($control);
 151                         return;
 152                 }
 153
 154                 $wgOut->setArticleFlag( false );
 155                 if ( !$this->loadRevisionData() ) {
 156                         $t = $this->mTitle->getPrefixedText();
 157                         $d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
 158                         $wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
 159                         $wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
 160                         wfProfileOut( __METHOD__ );
 161                         return;
 162                 }
 163
 164                 wfRunHooks( 'DiffViewHeader', array( $this, $this->mOldRev, $this->mNewRev ) );
 165
 166                 if ( $this->mNewRev->isCurrent() ) {
 167                         $wgOut->setArticleFlag( true );
 168                 }
 169
 170                 # mOldid is false if the difference engine is called with a "vague" query for
 171                 # a diff between a version V and its previous version V' AND the version V
 172                 # is the first version of that article. In that case, V' does not exist.
 173                 if ( $this->mOldid === false ) {
 174                         $this->showFirstRevision();
 175                         $this->renderNewRevision();  // should we respect $diffOnly here or not?
 176                         wfProfileOut( __METHOD__ );
 177                         return;
 178                 }
 179
 180                 $wgOut->suppressQuickbar();
 181
 182                 $oldTitle = $this->mOldPage->getPrefixedText();
 183                 $newTitle = $this->mNewPage->getPrefixedText();
 184                 if( $oldTitle == $newTitle ) {
 185                         $wgOut->setPageTitle( $newTitle );
 186                 } else {
 187                         $wgOut->setPageTitle( $oldTitle . ', ' . $newTitle );
 188                 }
 189                 $wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
 190                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 191
 192                 if ( !$this->mOldPage->userCanRead() || !$this->mNewPage->userCanRead() ) {
 193                         $wgOut->loginToUse();
 194                         $wgOut->output();
 195                         $wgOut->disable();
 196                         wfProfileOut( __METHOD__ );
 197                         return;
 198                 }
 199
 200                 $sk = $wgUser->getSkin();
 201
 202                 // Check if page is editable
 203                 $editable = $this->mNewRev->getTitle()->userCan( 'edit' );
 204                 if ( $editable && $this->mNewRev->isCurrent() && $wgUser->isAllowed( 'rollback' ) ) {
 205                         $rollback = '&nbsp;&nbsp;&nbsp;' . $sk->generateRollback( $this->mNewRev );
 206                 } else {
 207                         $rollback = '';
 208                 }
 209
 210                 // Prepare a change patrol link, if applicable
 211                 if( $wgUseRCPatrol && $this->mTitle->userCan('patrol') ) {
 212                         // If we've been given an explicit change identifier, use it; saves time
 213                         if( $this->mRcidMarkPatrolled ) {
 214                                 $rcid = $this->mRcidMarkPatrolled;
 215                                 $rc = RecentChange::newFromId( $rcid );
 216                                 // Already patrolled?
 217                                 $rcid = is_object($rc) && !$rc->getAttribute('rc_patrolled') ? $rcid : 0;
 218                         } else {
 219                                 // Look for an unpatrolled change corresponding to this diff
 220                                 $db = wfGetDB( DB_SLAVE );
 221                                 $change = RecentChange::newFromConds(
 222                                         array(
 223                                         // Redundant user,timestamp condition so we can use the existing index
 224                                                 'rc_user_text'  => $this->mNewRev->getRawUserText(),
 225                                                 'rc_timestamp'  => $db->timestamp( $this->mNewRev->getTimestamp() ),
 226                                                 'rc_this_oldid' => $this->mNewid,
 227                                                 'rc_last_oldid' => $this->mOldid,
 228                                                 'rc_patrolled'  => 0
 229                                         ),
 230                                         __METHOD__
 231                                 );
 232                                 if( $change instanceof RecentChange ) {
 233                                         $rcid = $change->mAttribs['rc_id'];
 234                                         $this->mRcidMarkPatrolled = $rcid;
 235                                 } else {
 236                                         // None found
 237                                         $rcid = 0;
 238                                 }
 239                         }
 240                         // Build the link
 241                         if( $rcid ) {
 242                                 $patrol = ' <span class="patrollink">[' . $sk->link(
 243                                         $this->mTitle,
 244                                         wfMsgHtml( 'markaspatrolleddiff' ),
 245                                         array(),
 246                                         array(
 247                                                 'action' => 'markpatrolled',
 248                                                 'rcid' => $rcid
 249                                         ),
 250                                         array(
 251                                                 'known',
 252                                                 'noclasses'
 253                                         )
 254                                 ) . ']</span>';
 255                         } else {
 256                                 $patrol = '';
 257                         }
 258                 } else {
 259                         $patrol = '';
 260                 }
 261
 262                 # Carry over 'diffonly' param via navigation links
 263                 if( $diffOnly != $wgUser->getBoolOption('diffonly') ) {
 264                         $query['diffonly'] = $diffOnly;
 265                 }
 266
 267                 $htmldiffarg = $this->htmlDiffArgument();
 268
 269                 if( $htmldiffarg ) {
 270                         $query['htmldiff'] = $htmldiffarg['htmldiff'];
 271                 }
 272
 273                 # Make "previous revision link"
 274                 $query['diff'] = 'prev';
 275                 $query['oldid'] = $this->mOldid;
 276                 # Cascade unhide param in links for easy deletion browsing
 277                 if( $this->unhide ) {
 278                         $query['unhide'] = 1;
 279                 }
 280                 $prevlink = $sk->link(
 281                         $this->mTitle,
 282                         wfMsgHtml( 'previousdiff' ),
 283                         array(
 284                                 'id' => 'differences-prevlink'
 285                         ),
 286                         $query,
 287                         array(
 288                                 'known',
 289                                 'noclasses'
 290                         )
 291                 );
 292
 293                 # Make "next revision link"
 294                 $query['diff'] = 'next';
 295                 $query['oldid'] = $this->mNewid;
 296                 # Skip next link on the top revision
 297                 if( $this->mNewRev->isCurrent() ) {
 298                         $nextlink = '&nbsp;';
 299                 } else {
 300                         $nextlink = $sk->link(
 301                                 $this->mTitle,
 302                                 wfMsgHtml( 'nextdiff' ),
 303                                 array(
 304                                         'id' => 'differences-nextlink'
 305                                 ),
 306                                 $query,
 307                                 array(
 308                                         'known',
 309                                         'noclasses'
 310                                 )
 311                         );
 312                 }
 313
 314                 $oldminor = '';
 315                 $newminor = '';
 316
 317                 if( $this->mOldRev->isMinor() ) {
 318                         $oldminor = ChangesList::flag( 'minor' );
 319                 }
 320                 if( $this->mNewRev->isMinor() ) {
 321                         $newminor = ChangesList::flag( 'minor' );
 322                 }
 323
 324                 $rdel = ''; $ldel = '';
 325                 # Handle RevisionDelete links...
 326                 if( $wgUser->isAllowed( 'deletedhistory' ) ) {
 327                         // Don't show useless link to people who cannot hide revisions
 328                         if( $this->mOldRev->getVisibility() || $wgUser->isAllowed( 'deleterevision' ) ) {
 329                                 if( !$this->mOldRev->userCan( Revision::DELETED_RESTRICTED ) ) {
 330                                         // If revision was hidden from sysops
 331                                         $ldel = Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ),
 332                                                 '(' . wfMsgHtml( 'rev-delundel' ) . ')' );
 333                                 } else {
 334                                         $query = array(
 335                                                 'type' => 'revision',
 336                                                 'target' => $this->mOldRev->mTitle->getPrefixedDbkey(),
 337                                                 'ids' => $this->mOldRev->getId()
 338                                         );
 339                                         $ldel = $sk->revDeleteLink( $query, $this->mOldRev->isDeleted( Revision::DELETED_RESTRICTED ) );
 340                                 }
 341                                 $ldel = "&nbsp;&nbsp;&nbsp;$ldel ";
 342                         }
 343                         // Don't show useless link to people who cannot hide revisions
 344                         if( $this->mNewRev->getVisibility() || $wgUser->isAllowed( 'deleterevision' ) ) {
 345                                 if( !$this->mNewRev->userCan( Revision::DELETED_RESTRICTED ) ) {
 346                                         // If revision was hidden from sysops
 347                                         $rdel = Xml::tags( 'span', array( 'class'=>'mw-revdelundel-link' ), '('.wfMsgHtml( 'rev-delundel' ).')' );
 348                                 } else {
 349                                         $query = array(
 350                                                 'type' => 'revision',
 351                                                 'target' =>  $this->mNewRev->mTitle->getPrefixedDbkey(),
 352                                                 'ids' => $this->mNewRev->getId()
 353                                         );
 354                                         $rdel = $sk->revDeleteLink( $query, $this->mNewRev->isDeleted( Revision::DELETED_RESTRICTED ) );
 355                                 }
 356                                 $rdel = "&nbsp;&nbsp;&nbsp;$rdel ";
 357                         }
 358                 }
 359
 360                 $oldHeader = '<div id="mw-diff-otitle1"><strong>'.$this->mOldtitle.'</strong></div>' .
 361                         '<div id="mw-diff-otitle2">' . $sk->revUserTools( $this->mOldRev, !$this->unhide ) . "</div>" .
 362                         '<div id="mw-diff-otitle3">' . $oldminor . $sk->revComment( $this->mOldRev, !$diffOnly, !$this->unhide ).$ldel."</div>" .
 363                         '<div id="mw-diff-otitle4">' . $prevlink .'</div>';
 364                 $newHeader = '<div id="mw-diff-ntitle1"><strong>'.$this->mNewtitle.'</strong></div>' .
 365                         '<div id="mw-diff-ntitle2">' . $sk->revUserTools( $this->mNewRev, !$this->unhide ) . " $rollback</div>" .
 366                         '<div id="mw-diff-ntitle3">' . $newminor . $sk->revComment( $this->mNewRev, !$diffOnly, !$this->unhide ).$rdel."</div>" .
 367                         '<div id="mw-diff-ntitle4">' . $nextlink . $patrol . '</div>';
 368
 369                 # Check if this user can see the revisions
 370                 $allowed = $this->mOldRev->userCan(Revision::DELETED_TEXT)
 371                         && $this->mNewRev->userCan(Revision::DELETED_TEXT);
 372                 # Check if one of the revisions is deleted/suppressed
 373                 $deleted = $suppressed = false;
 374                 if( $this->mOldRev->isDeleted(Revision::DELETED_TEXT) ) {
 375                         $deleted = true; // old revisions text is hidden
 376                         if( $this->mOldRev->isDeleted(Revision::DELETED_RESTRICTED) )
 377                                 $suppressed = true; // also suppressed
 378                 }
 379                 if( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
 380                         $deleted = true; // new revisions text is hidden
 381                         if( $this->mNewRev->isDeleted(Revision::DELETED_RESTRICTED) )
 382                                 $suppressed = true; // also suppressed
 383                 }
 384                 # If the diff cannot be shown due to a deleted revision, then output
 385                 # the diff header and links to unhide (if available)...
 386                 if( $deleted && (!$this->unhide || !$allowed) ) {
 387                         $this->showDiffStyle();
 388                         $multi = $this->getMultiNotice();
 389                         $wgOut->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
 390                         if( !$allowed ) {
 391                                 # Give explanation for why revision is not visible
 392                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n",
 393                                         array( 'rev-deleted-no-diff' ) );
 394                         } else {
 395                                 # Give explanation and add a link to view the diff...
 396                                 $link = $this->mTitle->getFullUrl( array(
 397                                         'diff' => $this->mNewid,
 398                                         'oldid' => $this->mOldid,
 399                                         'unhide' => 1
 400                                 ) );
 401                                 $msg = $suppressed ? 'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
 402                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", array( $msg, $link ) );
 403                         }
 404                 # Otherwise, output the HTML diff if requested...
 405                 } else if( $wgEnableHtmlDiff && $this->htmldiff ) {
 406                         $multi = $this->getMultiNotice();
 407                         $wgOut->addHTML( '<div class="diff-switchtype">' . $sk->link(
 408                                 $this->mTitle,
 409                                 wfMsgHtml( 'wikicodecomparison' ),
 410                                 array(
 411                                         'id' => 'differences-switchtype'
 412                                 ),
 413                                 array(
 414                                         'diff' => $this->mNewid,
 415                                         'oldid' => $this->mOldid,
 416                                         'htmldiff' => 0
 417                                 ),
 418                                 array(
 419                                         'known',
 420                                         'noclasses'
 421                                 )
 422                         ) . '</div>');
 423                         $wgOut->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
 424                         # Add deletion notice if the user is viewing deleted content
 425                         if( $deleted ) {
 426                                 $msg = $suppressed ? 'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
 427                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", $msg );
 428                         }
 429                         $this->renderHtmlDiff();
 430                 # Otherwise, output a regular diff...
 431                 } else {
 432                         if( $wgEnableHtmlDiff ) {
 433                                 $wgOut->addHTML( '<div class="diff-switchtype">' . $sk->link(
 434                                         $this->mTitle,
 435                                         wfMsgHtml( 'visualcomparison' ),
 436                                         array( 'id' => 'differences-switchtype' ),
 437                                         array(
 438                                                 'diff' => $this->mNewid,
 439                                                 'oldid' => $this->mOldid,
 440                                                 'htmldiff' => 1
 441                                         ),
 442                                         array( 'known', 'noclasses' )
 443                                 ) . '</div>');
 444                         }
 445                         # Add deletion notice if the user is viewing deleted content
 446                         $notice = '';
 447                         if( $deleted ) {
 448                                 $msg = $suppressed ? 'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
 449                                 $notice = "<div class='mw-warning plainlinks'>\n".wfMsgExt($msg,'parseinline')."</div>\n";
 450                         }
 451                         $this->showDiff( $oldHeader, $newHeader, $notice );
 452                         if( !$diffOnly ) {
 453                                 $this->renderNewRevision();
 454                         }
 455                 }
 456                 wfProfileOut( __METHOD__ );
 457         }
 458
 459         /**
 460          * Show the new revision of the page.
 461          */
 462         function renderNewRevision() {
 463                 global $wgOut, $wgUser;
 464                 wfProfileIn( __METHOD__ );
 465
 466                 $wgOut->addHTML( "<hr /><h2>{$this->mPagetitle}</h2>\n" );
 467                 # Add deleted rev tag if needed
 468                 if( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
 469                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 470                 } else if( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
 471                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 472                 }
 473
 474                 if( !$this->mNewRev->isCurrent() ) {
 475                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 476                 }
 477
 478                 $this->loadNewText();
 479                 if( is_object( $this->mNewRev ) ) {
 480                         $wgOut->setRevisionId( $this->mNewRev->getId() );
 481                 }
 482
 483                 if( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
 484                         // Stolen from Article::view --AG 2007-10-11
 485                         // Give hooks a chance to customise the output
 486                         if( wfRunHooks( 'ShowRawCssJs', array( $this->mNewtext, $this->mTitle, $wgOut ) ) ) {
 487                                 // Wrap the whole lot in a <pre> and don't parse
 488                                 $m = array();
 489                                 preg_match( '!\.(css|js)$!u', $this->mTitle->getText(), $m );
 490                                 $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 491                                 $wgOut->addHTML( htmlspecialchars( $this->mNewtext ) );
 492                                 $wgOut->addHTML( "\n</pre>\n" );
 493                         }
 494                 } else {
 495                         $wgOut->addWikiTextTidy( $this->mNewtext );
 496                 }
 497
 498                 if( is_object( $this->mNewRev ) && !$this->mNewRev->isCurrent() ) {
 499                         $wgOut->parserOptions()->setEditSection( $oldEditSectionSetting );
 500                 }
 501                 # Add redundant patrol link on bottom...
 502                 if( $this->mRcidMarkPatrolled && $this->mTitle->quickUserCan('patrol') ) {
 503                         $sk = $wgUser->getSkin();
 504                         $wgOut->addHTML(
 505                                 "<div class='patrollink'>[" . $sk->link(
 506                                         $this->mTitle,
 507                                         wfMsgHtml( 'markaspatrolleddiff' ),
 508                                         array(),
 509                                         array(
 510                                                 'action' => 'markpatrolled',
 511                                                 'rcid' => $this->mRcidMarkPatrolled
 512                                         )
 513                                 ) . ']</div>'
 514                          );
 515                 }
 516
 517                 wfProfileOut( __METHOD__ );
 518         }
 519
 520
 521         function renderHtmlDiff() {
 522                 global $wgOut, $wgParser, $wgDebugComments;
 523                 wfProfileIn( __METHOD__ );
 524
 525                 $this->showDiffStyle();
 526
 527                 $wgOut->addHTML( '<h2>'.wfMsgHtml( 'visual-comparison' )."</h2>\n" );
 528                 #add deleted rev tag if needed
 529                 if( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
 530                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-permission' );
 531                 } else if( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
 532                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1</div>\n", 'rev-deleted-text-view' );
 533                 }
 534
 535                 if( !$this->mNewRev->isCurrent() ) {
 536                         $oldEditSectionSetting = $wgOut->parserOptions()->setEditSection( false );
 537                 }
 538
 539                 $this->loadText();
 540
 541                 // Old revision
 542                 if( is_object( $this->mOldRev ) ) {
 543                         $wgOut->setRevisionId( $this->mOldRev->getId() );
 544                 }
 545
 546                 $popts = $wgOut->parserOptions();
 547                 $oldTidy = $popts->setTidy( true );
 548                 $popts->setEditSection( false );
 549
 550                 $parserOutput = $wgParser->parse( $this->mOldtext, $this->getTitle(), $popts, true, true, $wgOut->getRevisionId() );
 551                 $popts->setTidy( $oldTidy );
 552
 553                 //only for new?
 554                 //$wgOut->addParserOutputNoText( $parserOutput );
 555                 $oldHtml = $parserOutput->getText();
 556                 wfRunHooks( 'OutputPageBeforeHTML', array( &$wgOut, &$oldHtml ) );
 557
 558                 // New revision
 559                 if( is_object( $this->mNewRev ) ) {
 560                         $wgOut->setRevisionId( $this->mNewRev->getId() );
 561                 }
 562
 563                 $popts = $wgOut->parserOptions();
 564                 $oldTidy = $popts->setTidy( true );
 565
 566                 $parserOutput = $wgParser->parse( $this->mNewtext, $this->getTitle(), $popts, true, true, $wgOut->getRevisionId() );
 567                 $popts->setTidy( $oldTidy );
 568
 569                 $wgOut->addParserOutputNoText( $parserOutput );
 570                 $newHtml = $parserOutput->getText();
 571                 wfRunHooks( 'OutputPageBeforeHTML', array( &$wgOut, &$newHtml ) );
 572
 573                 unset($parserOutput, $popts);
 574
 575                 $differ = new HTMLDiffer(new DelegatingContentHandler($wgOut));
 576                 $differ->htmlDiff($oldHtml, $newHtml);
 577                 if ( $wgDebugComments ) {
 578                         $wgOut->addHTML( "\n<!-- HtmlDiff Debug Output:\n" . HTMLDiffer::getDebugOutput() . " End Debug -->" );
 579                 }
 580
 581                 wfProfileOut( __METHOD__ );
 582         }
 583
 584         /**
 585          * Show the first revision of an article. Uses normal diff headers in
 586          * contrast to normal "old revision" display style.
 587          */
 588         function showFirstRevision() {
 589                 global $wgOut, $wgUser;
 590                 wfProfileIn( __METHOD__ );
 591
 592                 # Get article text from the DB
 593                 #
 594                 if ( ! $this->loadNewText() ) {
 595                         $t = $this->mTitle->getPrefixedText();
 596                         $d = wfMsgExt( 'missingarticle-diff', array( 'escape' ), $this->mOldid, $this->mNewid );
 597                         $wgOut->setPagetitle( wfMsg( 'errorpagetitle' ) );
 598                         $wgOut->addWikiMsg( 'missing-article', "<nowiki>$t</nowiki>", $d );
 599                         wfProfileOut( __METHOD__ );
 600                         return;
 601                 }
 602                 if ( $this->mNewRev->isCurrent() ) {
 603                         $wgOut->setArticleFlag( true );
 604                 }
 605
 606                 # Check if user is allowed to look at this page. If not, bail out.
 607                 #
 608                 if ( !$this->mTitle->userCanRead() ) {
 609                         $wgOut->loginToUse();
 610                         $wgOut->output();
 611                         wfProfileOut( __METHOD__ );
 612                         throw new MWException("Permission Error: you do not have access to view this page");
 613                 }
 614
 615                 # Prepare the header box
 616                 #
 617                 $sk = $wgUser->getSkin();
 618
 619                 $next = $this->mTitle->getNextRevisionID( $this->mNewid );
 620                 if( !$next ) {
 621                         $nextlink = '';
 622                 } else {
 623                         $nextlink = '<br/>' . $sk->link(
 624                                 $this->mTitle,
 625                                 wfMsgHtml( 'nextdiff' ),
 626                                 array(
 627                                         'id' => 'differences-nextlink'
 628                                 ),
 629                                 array(
 630                                         'diff' => 'next',
 631                                         'oldid' => $this->mNewid,
 632                                         $this->htmlDiffArgument()
 633                                 ),
 634                                 array(
 635                                         'known',
 636                                         'noclasses'
 637                                 )
 638                         );
 639                 }
 640                 $header = "<div class=\"firstrevisionheader\" style=\"text-align: center\">" .
 641                         $sk->revUserTools( $this->mNewRev ) . "<br/>" . $sk->revComment( $this->mNewRev ) . $nextlink . "</div>\n";
 642
 643                 $wgOut->addHTML( $header );
 644
 645                 $wgOut->setSubtitle( wfMsgExt( 'difference', array( 'parseinline' ) ) );
 646                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 647
 648                 wfProfileOut( __METHOD__ );
 649         }
 650
 651         function htmlDiffArgument(){
 652                 global $wgEnableHtmlDiff;
 653                 if($wgEnableHtmlDiff){
 654                         if($this->htmldiff){
 655                                 return array( 'htmldiff' => 1 );
 656                         }else{
 657                                 return array( 'htmldiff' => 0 );
 658                         }
 659                 }else{
 660                         return array();
 661                 }
 662         }
 663
 664         /**
 665          * Get the diff text, send it to $wgOut
 666          * Returns false if the diff could not be generated, otherwise returns true
 667          */
 668         function showDiff( $otitle, $ntitle, $notice = '' ) {
 669                 global $wgOut;
 670                 $diff = $this->getDiff( $otitle, $ntitle, $notice );
 671                 if ( $diff === false ) {
 672                         $wgOut->addWikiMsg( 'missing-article', "<nowiki>(fixme, bug)</nowiki>", '' );
 673                         return false;
 674                 } else {
 675                         $this->showDiffStyle();
 676                         $wgOut->addHTML( $diff );
 677                         return true;
 678                 }
 679         }
 680
 681         /**
 682          * Add style sheets and supporting JS for diff display.
 683          */
 684         function showDiffStyle() {
 685                 global $wgStylePath, $wgStyleVersion, $wgOut;
 686                 $wgOut->addStyle( 'common/diff.css' );
 687
 688                 // JS is needed to detect old versions of Mozilla to work around an annoyance bug.
 689                 $wgOut->addScript( "<script type=\"text/javascript\" src=\"$wgStylePath/common/diff.js?$wgStyleVersion\"></script>" );
 690         }
 691
 692         /**
 693          * Get complete diff table, including header
 694          *
 695          * @param Title $otitle Old title
 696          * @param Title $ntitle New title
 697          * @param string $notice HTML between diff header and body
 698          * @return mixed
 699          */
 700         function getDiff( $otitle, $ntitle, $notice = '' ) {
 701                 $body = $this->getDiffBody();
 702                 if ( $body === false ) {
 703                         return false;
 704                 } else {
 705                         $multi = $this->getMultiNotice();
 706                         return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
 707                 }
 708         }
 709
 710         /**
 711          * Get the diff table body, without header
 712          *
 713          * @return mixed
 714          */
 715         function getDiffBody() {
 716                 global $wgMemc;
 717                 wfProfileIn( __METHOD__ );
 718                 $this->mCacheHit = true;
 719                 // Check if the diff should be hidden from this user
 720                 if ( !$this->loadRevisionData() )
 721                         return '';
 722                 if ( $this->mOldRev && !$this->mOldRev->userCan(Revision::DELETED_TEXT) ) {
 723                         return '';
 724                 } else if ( $this->mNewRev && !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
 725                         return '';
 726                 } else if ( $this->mOldRev && $this->mNewRev && $this->mOldRev->getID() == $this->mNewRev->getID() ) {
 727                         return '';
 728                 }
 729                 // Cacheable?
 730                 $key = false;
 731                 if ( $this->mOldid && $this->mNewid ) {
 732                         $key = wfMemcKey( 'diff', 'version', MW_DIFF_VERSION, 'oldid', $this->mOldid, 'newid', $this->mNewid );
 733                         // Try cache
 734                         if ( !$this->mRefreshCache ) {
 735                                 $difftext = $wgMemc->get( $key );
 736                                 if ( $difftext ) {
 737                                         wfIncrStats( 'diff_cache_hit' );
 738                                         $difftext = $this->localiseLineNumbers( $difftext );
 739                                         $difftext .= "\n<!-- diff cache key $key -->\n";
 740                                         wfProfileOut( __METHOD__ );
 741                                         return $difftext;
 742                                 }
 743                         } // don't try to load but save the result
 744                 }
 745                 $this->mCacheHit = false;
 746
 747                 // Loadtext is permission safe, this just clears out the diff
 748                 if ( !$this->loadText() ) {
 749                         wfProfileOut( __METHOD__ );
 750                         return false;
 751                 }
 752
 753                 $difftext = $this->generateDiffBody( $this->mOldtext, $this->mNewtext );
 754
 755                 // Save to cache for 7 days
 756                 if ( !wfRunHooks( 'AbortDiffCache', array( &$this ) ) ) {
 757                         wfIncrStats( 'diff_uncacheable' );
 758                 } else if ( $key !== false && $difftext !== false ) {
 759                         wfIncrStats( 'diff_cache_miss' );
 760                         $wgMemc->set( $key, $difftext, 7*86400 );
 761                 } else {
 762                         wfIncrStats( 'diff_uncacheable' );
 763                 }
 764                 // Replace line numbers with the text in the user's language
 765                 if ( $difftext !== false ) {
 766                         $difftext = $this->localiseLineNumbers( $difftext );
 767                 }
 768                 wfProfileOut( __METHOD__ );
 769                 return $difftext;
 770         }
 771
 772         /**
 773          * Make sure the proper modules are loaded before we try to
 774          * make the diff
 775          */
 776         private function initDiffEngines() {
 777                 global $wgExternalDiffEngine;
 778                 if ( $wgExternalDiffEngine == 'wikidiff' && !function_exists( 'wikidiff_do_diff' ) ) {
 779                         wfProfileIn( __METHOD__ . '-php_wikidiff.so' );
 780                         wfSuppressWarnings();
 781                         dl( 'php_wikidiff.so' );
 782                         wfRestoreWarnings();
 783                         wfProfileOut( __METHOD__ . '-php_wikidiff.so' );
 784                 }
 785                 else if ( $wgExternalDiffEngine == 'wikidiff2' && !function_exists( 'wikidiff2_do_diff' ) ) {
 786                         wfProfileIn( __METHOD__ . '-php_wikidiff2.so' );
 787                         wfSuppressWarnings();
 788                         dl( 'php_wikidiff2.so' );
 789                         wfRestoreWarnings();
 790                         wfProfileOut( __METHOD__ . '-php_wikidiff2.so' );
 791                 }
 792         }
 793
 794         /**
 795          * Generate a diff, no caching
 796          * $otext and $ntext must be already segmented
 797          */
 798         function generateDiffBody( $otext, $ntext ) {
 799                 global $wgExternalDiffEngine, $wgContLang;
 800
 801                 $otext = str_replace( "\r\n", "\n", $otext );
 802                 $ntext = str_replace( "\r\n", "\n", $ntext );
 803
 804                 $this->initDiffEngines();
 805
 806                 if ( $wgExternalDiffEngine == 'wikidiff' && function_exists( 'wikidiff_do_diff' ) ) {
 807                         # For historical reasons, external diff engine expects
 808                         # input text to be HTML-escaped already
 809                         $otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
 810                         $ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
 811                         return $wgContLang->unsegementForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) ) .
 812                         $this->debug( 'wikidiff1' );
 813                 }
 814
 815                 if ( $wgExternalDiffEngine == 'wikidiff2' && function_exists( 'wikidiff2_do_diff' ) ) {
 816                         # Better external diff engine, the 2 may some day be dropped
 817                         # This one does the escaping and segmenting itself
 818                         wfProfileIn( 'wikidiff2_do_diff' );
 819                         $text = wikidiff2_do_diff( $otext, $ntext, 2 );
 820                         $text .= $this->debug( 'wikidiff2' );
 821                         wfProfileOut( 'wikidiff2_do_diff' );
 822                         return $text;
 823                 }
 824                 if ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
 825                         # Diff via the shell
 826                         global $wgTmpDirectory;
 827                         $tempName1 = tempnam( $wgTmpDirectory, 'diff_' );
 828                         $tempName2 = tempnam( $wgTmpDirectory, 'diff_' );
 829
 830                         $tempFile1 = fopen( $tempName1, "w" );
 831                         if ( !$tempFile1 ) {
 832                                 wfProfileOut( __METHOD__ );
 833                                 return false;
 834                         }
 835                         $tempFile2 = fopen( $tempName2, "w" );
 836                         if ( !$tempFile2 ) {
 837                                 wfProfileOut( __METHOD__ );
 838                                 return false;
 839                         }
 840                         fwrite( $tempFile1, $otext );
 841                         fwrite( $tempFile2, $ntext );
 842                         fclose( $tempFile1 );
 843                         fclose( $tempFile2 );
 844                         $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
 845                         wfProfileIn( __METHOD__ . "-shellexec" );
 846                         $difftext = wfShellExec( $cmd );
 847                         $difftext .= $this->debug( "external $wgExternalDiffEngine" );
 848                         wfProfileOut( __METHOD__ . "-shellexec" );
 849                         unlink( $tempName1 );
 850                         unlink( $tempName2 );
 851                         return $difftext;
 852                 }
 853
 854                 # Native PHP diff
 855                 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
 856                 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
 857                 $diffs = new Diff( $ota, $nta );
 858                 $formatter = new TableDiffFormatter();
 859                 return $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) ) .
 860                 $this->debug();
 861         }
 862
 863         /**
 864          * Generate a debug comment indicating diff generating time,
 865          * server node, and generator backend.
 866          */
 867         protected function debug( $generator="internal" ) {
 868                 global $wgShowHostnames;
 869                 if ( !$this->enableDebugComment ) {
 870                         return '';
 871                 }
 872                 $data = array( $generator );
 873                 if( $wgShowHostnames ) {
 874                         $data[] = wfHostname();
 875                 }
 876                 $data[] = wfTimestamp( TS_DB );
 877                 return "<!-- diff generator: " .
 878                 implode( " ",
 879                 array_map(
 880                                         "htmlspecialchars",
 881                 $data ) ) .
 882                         " -->\n";
 883         }
 884
 885         /**
 886          * Replace line numbers with the text in the user's language
 887          */
 888         function localiseLineNumbers( $text ) {
 889                 return preg_replace_callback( '/<!--LINE (\d+)-->/',
 890                 array( &$this, 'localiseLineNumbersCb' ), $text );
 891         }
 892
 893         function localiseLineNumbersCb( $matches ) {
 894                 global $wgLang;
 895                 if ( $matches[1] === '1' && $this->mReducedLineNumbers ) return '';
 896                 return wfMsgExt( 'lineno', 'escape', $wgLang->formatNum( $matches[1] ) );
 897         }
 898
 899
 900         /**
 901          * If there are revisions between the ones being compared, return a note saying so.
 902          */
 903         function getMultiNotice() {
 904                 if ( !is_object($this->mOldRev) || !is_object($this->mNewRev) )
 905                 return '';
 906
 907                 if( !$this->mOldPage->equals( $this->mNewPage ) ) {
 908                         // Comparing two different pages? Count would be meaningless.
 909                         return '';
 910                 }
 911
 912                 $oldid = $this->mOldRev->getId();
 913                 $newid = $this->mNewRev->getId();
 914                 if ( $oldid > $newid ) {
 915                         $tmp = $oldid; $oldid = $newid; $newid = $tmp;
 916                 }
 917
 918                 $n = $this->mTitle->countRevisionsBetween( $oldid, $newid );
 919                 if ( !$n )
 920                 return '';
 921
 922                 return wfMsgExt( 'diff-multi', array( 'parseinline' ), $n );
 923         }
 924
 925
 926         /**
 927          * Add the header to a diff body
 928          */
 929         static function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
 930                 $header = "<table class='diff'>";
 931                 if( $diff ) { // Safari/Chrome show broken output if cols not used
 932                         $header .= "
 933                         <col class='diff-marker' />
 934                         <col class='diff-content' />
 935                         <col class='diff-marker' />
 936                         <col class='diff-content' />";
 937                         $colspan = 2;
 938                         $multiColspan = 4;
 939                 } else {
 940                         $colspan = 1;
 941                         $multiColspan = 2;
 942                 }
 943                 $header .= "
 944                 <tr valign='top'>
 945                 <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
 946                 <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
 947                 </tr>";
 948
 949                 if ( $multi != '' ) {
 950                         $header .= "<tr><td colspan='{$multiColspan}' align='center' class='diff-multi'>{$multi}</td></tr>";
 951                 }
 952                 if ( $notice != '' ) {
 953                         $header .= "<tr><td colspan='{$multiColspan}' align='center'>{$notice}</td></tr>";
 954                 }
 955
 956                 return $header . $diff . "</table>";
 957         }
 958
 959         /**
 960          * Use specified text instead of loading from the database
 961          */
 962         function setText( $oldText, $newText ) {
 963                 $this->mOldtext = $oldText;
 964                 $this->mNewtext = $newText;
 965                 $this->mTextLoaded = 2;
 966                 $this->mRevisionsLoaded = true;
 967         }
 968
 969         /**
 970          * Load revision metadata for the specified articles. If newid is 0, then compare
 971          * the old article in oldid to the current article; if oldid is 0, then
 972          * compare the current article to the immediately previous one (ignoring the
 973          * value of newid).
 974          *
 975          * If oldid is false, leave the corresponding revision object set
 976          * to false. This is impossible via ordinary user input, and is provided for
 977          * API convenience.
 978          */
 979         function loadRevisionData() {
 980                 global $wgLang, $wgUser;
 981                 if ( $this->mRevisionsLoaded ) {
 982                         return true;
 983                 } else {
 984                         // Whether it succeeds or fails, we don't want to try again
 985                         $this->mRevisionsLoaded = true;
 986                 }
 987
 988                 // Load the new revision object
 989                 $this->mNewRev = $this->mNewid
 990                         ? Revision::newFromId( $this->mNewid )
 991                         : Revision::newFromTitle( $this->mTitle );
 992                 if( !$this->mNewRev instanceof Revision )
 993                         return false;
 994
 995                 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
 996                 $this->mNewid = $this->mNewRev->getId();
 997
 998                 // Check if page is editable
 999                 $editable = $this->mNewRev->getTitle()->userCan( 'edit' );
1000
1001                 // Set assorted variables
1002                 $timestamp = $wgLang->timeanddate( $this->mNewRev->getTimestamp(), true );
1003                 $dateofrev = $wgLang->date( $this->mNewRev->getTimestamp(), true );
1004                 $timeofrev = $wgLang->time( $this->mNewRev->getTimestamp(), true );
1005                 $this->mNewPage = $this->mNewRev->getTitle();
1006                 if( $this->mNewRev->isCurrent() ) {
1007                         $newLink = $this->mNewPage->escapeLocalUrl( array(
1008                                 'oldid' => $this->mNewid
1009                         ) );
1010                         $this->mPagetitle = htmlspecialchars( wfMsg(
1011                                 'currentrev-asof',
1012                                 $timestamp,
1013                                 $dateofrev,
1014                                 $timeofrev
1015                         ) );
1016                         $newEdit = $this->mNewPage->escapeLocalUrl( array(
1017                                 'action' => 'edit'
1018                         ) );
1019
1020                         $this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
1021                         $this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
1022                 } else {
1023                         $newLink = $this->mNewPage->escapeLocalUrl( array(
1024                                 'oldid' => $this->mNewid
1025                         ) );
1026                         $newEdit = $this->mNewPage->escapeLocalUrl( array(
1027                                 'action' => 'edit',
1028                                 'oldid' => $this->mNewid
1029                         ) );
1030                         $this->mPagetitle = htmlspecialchars( wfMsg(
1031                                 'revisionasof',
1032                                 $timestamp,
1033                                 $dateofrev,
1034                                 $timeofrev
1035                         ) );
1036
1037                         $this->mNewtitle = "<a href='$newLink'>{$this->mPagetitle}</a>";
1038                         $this->mNewtitle .= " (<a href='$newEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
1039                 }
1040                 if( !$this->mNewRev->userCan(Revision::DELETED_TEXT) ) {
1041                         $this->mNewtitle = "<span class='history-deleted'>{$this->mPagetitle}</span>";
1042                 } else if ( $this->mNewRev->isDeleted(Revision::DELETED_TEXT) ) {
1043                         $this->mNewtitle = "<span class='history-deleted'>{$this->mNewtitle}</span>";
1044                 }
1045
1046                 // Load the old revision object
1047                 $this->mOldRev = false;
1048                 if( $this->mOldid ) {
1049                         $this->mOldRev = Revision::newFromId( $this->mOldid );
1050                 } elseif ( $this->mOldid === 0 ) {
1051                         $rev = $this->mNewRev->getPrevious();
1052                         if( $rev ) {
1053                                 $this->mOldid = $rev->getId();
1054                                 $this->mOldRev = $rev;
1055                         } else {
1056                                 // No previous revision; mark to show as first-version only.
1057                                 $this->mOldid = false;
1058                                 $this->mOldRev = false;
1059                         }
1060                 }/* elseif ( $this->mOldid === false ) leave mOldRev false; */
1061
1062                 if( is_null( $this->mOldRev ) ) {
1063                         return false;
1064                 }
1065
1066                 if ( $this->mOldRev ) {
1067                         $this->mOldPage = $this->mOldRev->getTitle();
1068
1069                         $t = $wgLang->timeanddate( $this->mOldRev->getTimestamp(), true );
1070                         $dateofrev = $wgLang->date( $this->mOldRev->getTimestamp(), true );
1071                         $timeofrev = $wgLang->time( $this->mOldRev->getTimestamp(), true );
1072                         $oldLink = $this->mOldPage->escapeLocalUrl( array(
1073                                 'oldid' => $this->mOldid
1074                         ) );
1075                         $oldEdit = $this->mOldPage->escapeLocalUrl( array(
1076                                 'action' => 'edit',
1077                                 'oldid' => $this->mOldid
1078                         ) );
1079                         $this->mOldPagetitle = htmlspecialchars( wfMsg( 'revisionasof', $t, $dateofrev, $timeofrev ) );
1080
1081                         $this->mOldtitle = "<a href='$oldLink'>{$this->mOldPagetitle}</a>"
1082                         . " (<a href='$oldEdit'>" . wfMsgHtml( $editable ? 'editold' : 'viewsourceold' ) . "</a>)";
1083                         // Add an "undo" link
1084                         $newUndo = $this->mNewPage->escapeLocalUrl( array(
1085                                 'action' => 'edit',
1086                                 'undoafter' => $this->mOldid,
1087                                 'undo' => $this->mNewid
1088                         ) );
1089                         $htmlLink = htmlspecialchars( wfMsg( 'editundo' ) );
1090                         $htmlTitle = $wgUser->getSkin()->tooltip( 'undo' );
1091                         if( $editable && !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
1092                                 $this->mNewtitle .= " (<a href='$newUndo' $htmlTitle>" . $htmlLink . "</a>)";
1093                         }
1094
1095                         if( !$this->mOldRev->userCan( Revision::DELETED_TEXT ) ) {
1096                                 $this->mOldtitle = '<span class="history-deleted">' . $this->mOldPagetitle . '</span>';
1097                         } else if( $this->mOldRev->isDeleted( Revision::DELETED_TEXT ) ) {
1098                                 $this->mOldtitle = '<span class="history-deleted">' . $this->mOldtitle . '</span>';
1099                         }
1100                 }
1101
1102                 return true;
1103         }
1104
1105         /**
1106          * Load the text of the revisions, as well as revision data.
1107          */
1108         function loadText() {
1109                 if ( $this->mTextLoaded == 2 ) {
1110                         return true;
1111                 } else {
1112                         // Whether it succeeds or fails, we don't want to try again
1113                         $this->mTextLoaded = 2;
1114                 }
1115
1116                 if ( !$this->loadRevisionData() ) {
1117                         return false;
1118                 }
1119                 if ( $this->mOldRev ) {
1120                         $this->mOldtext = $this->mOldRev->getText( Revision::FOR_THIS_USER );
1121                         if ( $this->mOldtext === false ) {
1122                                 return false;
1123                         }
1124                 }
1125                 if ( $this->mNewRev ) {
1126                         $this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
1127                         if ( $this->mNewtext === false ) {
1128                                 return false;
1129                         }
1130                 }
1131                 return true;
1132         }
1133
1134         /**
1135          * Load the text of the new revision, not the old one
1136          */
1137         function loadNewText() {
1138                 if ( $this->mTextLoaded >= 1 ) {
1139                         return true;
1140                 } else {
1141                         $this->mTextLoaded = 1;
1142                 }
1143                 if ( !$this->loadRevisionData() ) {
1144                         return false;
1145                 }
1146                 $this->mNewtext = $this->mNewRev->getText( Revision::FOR_THIS_USER );
1147                 return true;
1148         }
1149 }