includes/diff/DifferenceEngine.php

   1 <?php
   2 /**
   3  * User interface for the difference engine.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup DifferenceEngine
  22  */
  23
  24 /**
  25  * Constant to indicate diff cache compatibility.
  26  * Bump this when changing the diff formatting in a way that
  27  * fixes important bugs or such to force cached diff views to
  28  * clear.
  29  */
  30 define( 'MW_DIFF_VERSION', '1.11a' );
  31
  32 /**
  33  * @todo document
  34  * @ingroup DifferenceEngine
  35  */
  36 class DifferenceEngine extends ContextSource {
  37         /**#@+
  38          * @private
  39          */
  40         var $mOldid, $mNewid;
  41         var $mOldContent, $mNewContent;
  42         protected $mDiffLang;
  43
  44         /**
  45          * @var Title
  46          */
  47         var $mOldPage, $mNewPage;
  48         var $mRcidMarkPatrolled;
  49
  50         /**
  51          * @var Revision
  52          */
  53         var $mOldRev, $mNewRev;
  54         private $mRevisionsIdsLoaded = false; // Have the revisions IDs been loaded
  55         var $mRevisionsLoaded = false; // Have the revisions been loaded
  56         var $mTextLoaded = 0; // How many text blobs have been loaded, 0, 1 or 2?
  57         var $mCacheHit = false; // Was the diff fetched from cache?
  58
  59         /**
  60          * Set this to true to add debug info to the HTML output.
  61          * Warning: this may cause RSS readers to spuriously mark articles as "new"
  62          * (bug 20601)
  63          */
  64         var $enableDebugComment = false;
  65
  66         // If true, line X is not displayed when X is 1, for example to increase
  67         // readability and conserve space with many small diffs.
  68         protected $mReducedLineNumbers = false;
  69
  70         // Link to action=markpatrolled
  71         protected $mMarkPatrolledLink = null;
  72
  73         protected $unhide = false; # show rev_deleted content if allowed
  74         /**#@-*/
  75
  76         /**
  77          * Constructor
  78          * @param $context IContextSource context to use, anything else will be ignored
  79          * @param $old Integer old ID we want to show and diff with.
  80          * @param $new String either 'prev' or 'next'.
  81          * @param $rcid Integer ??? FIXME (default 0)
  82          * @param $refreshCache boolean If set, refreshes the diff cache
  83          * @param $unhide boolean If set, allow viewing deleted revs
  84          */
  85         function __construct( $context = null, $old = 0, $new = 0, $rcid = 0,
  86                 $refreshCache = false, $unhide = false )
  87         {
  88                 if ( $context instanceof IContextSource ) {
  89                         $this->setContext( $context );
  90                 }
  91
  92                 wfDebug( "DifferenceEngine old '$old' new '$new' rcid '$rcid'\n" );
  93
  94                 $this->mOldid = $old;
  95                 $this->mNewid = $new;
  96                 $this->mRcidMarkPatrolled = intval( $rcid );  # force it to be an integer
  97                 $this->mRefreshCache = $refreshCache;
  98                 $this->unhide = $unhide;
  99         }
 100
 101         /**
 102          * @param $value bool
 103          */
 104         function setReducedLineNumbers( $value = true ) {
 105                 $this->mReducedLineNumbers = $value;
 106         }
 107
 108         /**
 109          * @return Language
 110          */
 111         function getDiffLang() {
 112                 if ( $this->mDiffLang === null ) {
 113                         # Default language in which the diff text is written.
 114                         $this->mDiffLang = $this->getTitle()->getPageLanguage();
 115                 }
 116                 return $this->mDiffLang;
 117         }
 118
 119         /**
 120          * @return bool
 121          */
 122         function wasCacheHit() {
 123                 return $this->mCacheHit;
 124         }
 125
 126         /**
 127          * @return int
 128          */
 129         function getOldid() {
 130                 $this->loadRevisionIds();
 131                 return $this->mOldid;
 132         }
 133
 134         /**
 135          * @return Bool|int
 136          */
 137         function getNewid() {
 138                 $this->loadRevisionIds();
 139                 return $this->mNewid;
 140         }
 141
 142         /**
 143          * Look up a special:Undelete link to the given deleted revision id,
 144          * as a workaround for being unable to load deleted diffs in currently.
 145          *
 146          * @param int $id revision ID
 147          * @return mixed URL or false
 148          */
 149         function deletedLink( $id ) {
 150                 if ( $this->getUser()->isAllowed( 'deletedhistory' ) ) {
 151                         $dbr = wfGetDB( DB_SLAVE );
 152                         $row = $dbr->selectRow('archive', '*',
 153                                 array( 'ar_rev_id' => $id ),
 154                                 __METHOD__ );
 155                         if ( $row ) {
 156                                 $rev = Revision::newFromArchiveRow( $row );
 157                                 $title = Title::makeTitleSafe( $row->ar_namespace, $row->ar_title );
 158                                 return SpecialPage::getTitleFor( 'Undelete' )->getFullURL( array(
 159                                         'target' => $title->getPrefixedText(),
 160                                         'timestamp' => $rev->getTimestamp()
 161                                 ));
 162                         }
 163                 }
 164                 return false;
 165         }
 166
 167         /**
 168          * Build a wikitext link toward a deleted revision, if viewable.
 169          *
 170          * @param int $id revision ID
 171          * @return string wikitext fragment
 172          */
 173         function deletedIdMarker( $id ) {
 174                 $link = $this->deletedLink( $id );
 175                 if ( $link ) {
 176                         return "[$link $id]";
 177                 } else {
 178                         return $id;
 179                 }
 180         }
 181
 182         private function showMissingRevision() {
 183                 $out = $this->getOutput();
 184
 185                 $missing = array();
 186                 if ( $this->mOldRev === null ) {
 187                         $missing[] = $this->deletedIdMarker( $this->mOldid );
 188                 }
 189                 if ( $this->mNewRev === null ) {
 190                         $missing[] = $this->deletedIdMarker( $this->mNewid );
 191                 }
 192
 193                 $out->setPageTitle( $this->msg( 'errorpagetitle' ) );
 194                 $out->addWikiMsg( 'difference-missing-revision',
 195                         $this->getLanguage()->listToText( $missing ), count( $missing ) );
 196         }
 197
 198         function showDiffPage( $diffOnly = false ) {
 199                 wfProfileIn( __METHOD__ );
 200
 201                 # Allow frames except in certain special cases
 202                 $out = $this->getOutput();
 203                 $out->allowClickjacking();
 204                 $out->setRobotPolicy( 'noindex,nofollow' );
 205
 206                 if ( !$this->loadRevisionData() ) {
 207                         $this->showMissingRevision();
 208                         wfProfileOut( __METHOD__ );
 209                         return;
 210                 }
 211
 212                 $user = $this->getUser();
 213                 $permErrors = $this->mNewPage->getUserPermissionsErrors( 'read', $user );
 214                 if ( $this->mOldPage ) { # mOldPage might not be set, see below.
 215                         $permErrors = wfMergeErrorArrays( $permErrors,
 216                                 $this->mOldPage->getUserPermissionsErrors( 'read', $user ) );
 217                 }
 218                 if ( count( $permErrors ) ) {
 219                         wfProfileOut( __METHOD__ );
 220                         throw new PermissionsError( 'read', $permErrors );
 221                 }
 222
 223                 # If external diffs are enabled both globally and for the user,
 224                 # we'll use the application/x-external-editor interface to call
 225                 # an external diff tool like kompare, kdiff3, etc.
 226                 if ( ExternalEdit::useExternalEngine( $this->getContext(), 'diff' ) ) { #FIXME: how to handle this for non-text content?
 227                         $urls = array(
 228                                 'File' => array( 'Extension' => 'wiki', 'URL' =>
 229                                         # This should be mOldPage, but it may not be set, see below.
 230                                         $this->mNewPage->getCanonicalURL( array(
 231                                                 'action' => 'raw', 'oldid' => $this->mOldid ) )
 232                                 ),
 233                                 'File2' => array( 'Extension' => 'wiki', 'URL' =>
 234                                         $this->mNewPage->getCanonicalURL( array(
 235                                                 'action' => 'raw', 'oldid' => $this->mNewid ) )
 236                                 ),
 237                         );
 238
 239                         $externalEditor = new ExternalEdit( $this->getContext(), $urls );
 240                         $externalEditor->execute();
 241
 242                         wfProfileOut( __METHOD__ );
 243                         return;
 244                 }
 245
 246                 $rollback = '';
 247                 $undoLink = '';
 248
 249                 $query = array();
 250                 # Carry over 'diffonly' param via navigation links
 251                 if ( $diffOnly != $user->getBoolOption( 'diffonly' ) ) {
 252                         $query['diffonly'] = $diffOnly;
 253                 }
 254                 # Cascade unhide param in links for easy deletion browsing
 255                 if ( $this->unhide ) {
 256                         $query['unhide'] = 1;
 257                 }
 258
 259                 # Check if one of the revisions is deleted/suppressed
 260                 $deleted = $suppressed = false;
 261                 $allowed = $this->mNewRev->userCan( Revision::DELETED_TEXT, $user );
 262
 263                 # mOldRev is false if the difference engine is called with a "vague" query for
 264                 # a diff between a version V and its previous version V' AND the version V
 265                 # is the first version of that article. In that case, V' does not exist.
 266                 if ( $this->mOldRev === false ) {
 267                         $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage->getPrefixedText() ) );
 268                         $samePage = true;
 269                         $oldHeader = '';
 270                 } else {
 271                         wfRunHooks( 'DiffViewHeader', array( $this, $this->mOldRev, $this->mNewRev ) );
 272
 273                         $sk = $this->getSkin();
 274                         if ( method_exists( $sk, 'suppressQuickbar' ) ) {
 275                                 $sk->suppressQuickbar();
 276                         }
 277
 278                         if ( $this->mNewPage->equals( $this->mOldPage ) ) {
 279                                 $out->setPageTitle( $this->msg( 'difference-title', $this->mNewPage->getPrefixedText() ) );
 280                                 $samePage = true;
 281                         } else {
 282                                 $out->setPageTitle( $this->msg( 'difference-title-multipage', $this->mOldPage->getPrefixedText(),
 283                                         $this->mNewPage->getPrefixedText() ) );
 284                                 $out->addSubtitle( $this->msg( 'difference-multipage' ) );
 285                                 $samePage = false;
 286                         }
 287
 288                         if ( $samePage && $this->mNewPage->quickUserCan( 'edit', $user ) ) {
 289                                 if ( $this->mNewRev->isCurrent() && $this->mNewPage->userCan( 'rollback', $user ) ) {
 290                                         $out->preventClickjacking();
 291                                         $rollback = '&#160;&#160;&#160;' . Linker::generateRollback( $this->mNewRev, $this->getContext() );
 292                                 }
 293                                 if ( !$this->mOldRev->isDeleted( Revision::DELETED_TEXT ) && !$this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
 294                                         $undoLink = ' ' . $this->msg( 'parentheses' )->rawParams(
 295                                                 Html::element( 'a', array(
 296                                                         'href' => $this->mNewPage->getLocalUrl( array(
 297                                                                 'action' => 'edit',
 298                                                                 'undoafter' => $this->mOldid,
 299                                                                 'undo' => $this->mNewid ) ),
 300                                                         'title' => Linker::titleAttrib( 'undo' )
 301                                                 ),
 302                                                 $this->msg( 'editundo' )->text()
 303                                         ) )->escaped();
 304                                 }
 305                         }
 306
 307                         # Make "previous revision link"
 308                         if ( $samePage && $this->mOldRev->getPrevious() ) {
 309                                 $prevlink = Linker::linkKnown(
 310                                         $this->mOldPage,
 311                                         $this->msg( 'previousdiff' )->escaped(),
 312                                         array( 'id' => 'differences-prevlink' ),
 313                                         array( 'diff' => 'prev', 'oldid' => $this->mOldid ) + $query
 314                                 );
 315                         } else {
 316                                 $prevlink = '&#160;';
 317                         }
 318
 319                         if ( $this->mOldRev->isMinor() ) {
 320                                 $oldminor = ChangesList::flag( 'minor' );
 321                         } else {
 322                                 $oldminor = '';
 323                         }
 324
 325                         $ldel = $this->revisionDeleteLink( $this->mOldRev );
 326                         $oldRevisionHeader = $this->getRevisionHeader( $this->mOldRev, 'complete' );
 327
 328                         $oldHeader = '<div id="mw-diff-otitle1"><strong>' . $oldRevisionHeader . '</strong></div>' .
 329                                 '<div id="mw-diff-otitle2">' .
 330                                         Linker::revUserTools( $this->mOldRev, !$this->unhide ) . '</div>' .
 331                                 '<div id="mw-diff-otitle3">' . $oldminor .
 332                                         Linker::revComment( $this->mOldRev, !$diffOnly, !$this->unhide ) . $ldel . '</div>' .
 333                                 '<div id="mw-diff-otitle4">' . $prevlink . '</div>';
 334
 335                         if ( $this->mOldRev->isDeleted( Revision::DELETED_TEXT ) ) {
 336                                 $deleted = true; // old revisions text is hidden
 337                                 if ( $this->mOldRev->isDeleted( Revision::DELETED_RESTRICTED ) ) {
 338                                         $suppressed = true; // also suppressed
 339                                 }
 340                         }
 341
 342                         # Check if this user can see the revisions
 343                         if ( !$this->mOldRev->userCan( Revision::DELETED_TEXT, $user ) ) {
 344                                 $allowed = false;
 345                         }
 346                 }
 347
 348                 # Make "next revision link"
 349                 # Skip next link on the top revision
 350                 if ( $samePage && !$this->mNewRev->isCurrent() ) {
 351                         $nextlink = Linker::linkKnown(
 352                                 $this->mNewPage,
 353                                 $this->msg( 'nextdiff' )->escaped(),
 354                                 array( 'id' => 'differences-nextlink' ),
 355                                 array( 'diff' => 'next', 'oldid' => $this->mNewid ) + $query
 356                         );
 357                 } else {
 358                         $nextlink = '&#160;';
 359                 }
 360
 361                 if ( $this->mNewRev->isMinor() ) {
 362                         $newminor = ChangesList::flag( 'minor' );
 363                 } else {
 364                         $newminor = '';
 365                 }
 366
 367                 # Handle RevisionDelete links...
 368                 $rdel = $this->revisionDeleteLink( $this->mNewRev );
 369                 $newRevisionHeader = $this->getRevisionHeader( $this->mNewRev, 'complete' ) . $undoLink;
 370
 371                 $newHeader = '<div id="mw-diff-ntitle1"><strong>' . $newRevisionHeader . '</strong></div>' .
 372                         '<div id="mw-diff-ntitle2">' . Linker::revUserTools( $this->mNewRev, !$this->unhide ) .
 373                                 " $rollback</div>" .
 374                         '<div id="mw-diff-ntitle3">' . $newminor .
 375                                 Linker::revComment( $this->mNewRev, !$diffOnly, !$this->unhide ) . $rdel . '</div>' .
 376                         '<div id="mw-diff-ntitle4">' . $nextlink . $this->markPatrolledLink() . '</div>';
 377
 378                 if ( $this->mNewRev->isDeleted( Revision::DELETED_TEXT ) ) {
 379                         $deleted = true; // new revisions text is hidden
 380                         if ( $this->mNewRev->isDeleted( Revision::DELETED_RESTRICTED ) )
 381                                 $suppressed = true; // also suppressed
 382                 }
 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                         $out->addHTML( $this->addHeader( '', $oldHeader, $newHeader, $multi ) );
 390                         if ( !$allowed ) {
 391                                 $msg = $suppressed ? 'rev-suppressed-no-diff' : 'rev-deleted-no-diff';
 392                                 # Give explanation for why revision is not visible
 393                                 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n",
 394                                         array( $msg ) );
 395                         } else {
 396                                 # Give explanation and add a link to view the diff...
 397                                 $link = $this->getTitle()->getFullUrl( $this->getRequest()->appendQueryValue( 'unhide', '1', true ) );
 398                                 $msg = $suppressed ? 'rev-suppressed-unhide-diff' : 'rev-deleted-unhide-diff';
 399                                 $out->wrapWikiMsg( "<div id='mw-$msg' class='mw-warning plainlinks'>\n$1\n</div>\n", array( $msg, $link ) );
 400                         }
 401                 # Otherwise, output a regular diff...
 402                 } else {
 403                         # Add deletion notice if the user is viewing deleted content
 404                         $notice = '';
 405                         if ( $deleted ) {
 406                                 $msg = $suppressed ? 'rev-suppressed-diff-view' : 'rev-deleted-diff-view';
 407                                 $notice = "<div id='mw-$msg' class='mw-warning plainlinks'>\n" . $this->msg( $msg )->parse() . "</div>\n";
 408                         }
 409                         $this->showDiff( $oldHeader, $newHeader, $notice );
 410                         if ( !$diffOnly ) {
 411                                 $this->renderNewRevision();
 412                         }
 413                 }
 414                 wfProfileOut( __METHOD__ );
 415         }
 416
 417         /**
 418          * Get a link to mark the change as patrolled, or '' if there's either no
 419          * revision to patrol or the user is not allowed to to it.
 420          * Side effect: this method will call OutputPage::preventClickjacking()
 421          * when a link is builded.
 422          *
 423          * @return String
 424          */
 425         protected function markPatrolledLink() {
 426                 global $wgUseRCPatrol;
 427
 428                 if ( $this->mMarkPatrolledLink === null ) {
 429                         // Prepare a change patrol link, if applicable
 430                         if ( $wgUseRCPatrol && $this->mNewPage->quickUserCan( 'patrol', $this->getUser() ) ) {
 431                                 // If we've been given an explicit change identifier, use it; saves time
 432                                 if ( $this->mRcidMarkPatrolled ) {
 433                                         $rcid = $this->mRcidMarkPatrolled;
 434                                         $rc = RecentChange::newFromId( $rcid );
 435                                         // Already patrolled?
 436                                         $rcid = is_object( $rc ) && !$rc->getAttribute( 'rc_patrolled' ) ? $rcid : 0;
 437                                 } else {
 438                                         // Look for an unpatrolled change corresponding to this diff
 439                                         $db = wfGetDB( DB_SLAVE );
 440                                         $change = RecentChange::newFromConds(
 441                                                 array(
 442                                                 // Redundant user,timestamp condition so we can use the existing index
 443                                                         'rc_user_text'  => $this->mNewRev->getRawUserText(),
 444                                                         'rc_timestamp'  => $db->timestamp( $this->mNewRev->getTimestamp() ),
 445                                                         'rc_this_oldid' => $this->mNewid,
 446                                                         'rc_last_oldid' => $this->mOldid,
 447                                                         'rc_patrolled'  => 0
 448                                                 ),
 449                                                 __METHOD__
 450                                         );
 451                                         if ( $change instanceof RecentChange ) {
 452                                                 $rcid = $change->mAttribs['rc_id'];
 453                                                 $this->mRcidMarkPatrolled = $rcid;
 454                                         } else {
 455                                                 // None found
 456                                                 $rcid = 0;
 457                                         }
 458                                 }
 459                                 // Build the link
 460                                 if ( $rcid ) {
 461                                         $this->getOutput()->preventClickjacking();
 462                                         $token = $this->getUser()->getEditToken( $rcid );
 463                                         $this->mMarkPatrolledLink = ' <span class="patrollink">[' . Linker::linkKnown(
 464                                                 $this->mNewPage,
 465                                                 $this->msg( 'markaspatrolleddiff' )->escaped(),
 466                                                 array(),
 467                                                 array(
 468                                                         'action' => 'markpatrolled',
 469                                                         'rcid' => $rcid,
 470                                                         'token' => $token,
 471                                                 )
 472                                         ) . ']</span>';
 473                                 } else {
 474                                         $this->mMarkPatrolledLink = '';
 475                                 }
 476                         } else {
 477                                 $this->mMarkPatrolledLink = '';
 478                         }
 479                 }
 480
 481                 return $this->mMarkPatrolledLink;
 482         }
 483
 484         /**
 485          * @param $rev Revision
 486          * @return String
 487          */
 488         protected function revisionDeleteLink( $rev ) {
 489                 $link = Linker::getRevDeleteLink( $this->getUser(), $rev, $rev->getTitle() );
 490                 if ( $link !== '' ) {
 491                         $link = '&#160;&#160;&#160;' . $link . ' ';
 492                 }
 493                 return $link;
 494         }
 495
 496         /**
 497          * Show the new revision of the page.
 498          */
 499         function renderNewRevision() {
 500                 wfProfileIn( __METHOD__ );
 501                 $out = $this->getOutput();
 502                 $revHeader = $this->getRevisionHeader( $this->mNewRev );
 503                 # Add "current version as of X" title
 504                 $out->addHTML( "<hr class='diff-hr' />
 505                 <h2 class='diff-currentversion-title'>{$revHeader}</h2>\n" );
 506                 # Page content may be handled by a hooked call instead...
 507                 if ( wfRunHooks( 'ArticleContentOnDiff', array( $this, $out ) ) ) {
 508                         $this->loadNewText();
 509                         $out->setRevisionId( $this->mNewid );
 510                         $out->setRevisionTimestamp( $this->mNewRev->getTimestamp() );
 511                         $out->setArticleFlag( true );
 512
 513                         if ( $this->mNewPage->isCssJsSubpage() || $this->mNewPage->isCssOrJsPage() ) { #NOTE: only needed for B/C: custom rendering of JS/CSS via hook
 514                                 // Stolen from Article::view --AG 2007-10-11
 515                                 // Give hooks a chance to customise the output
 516                                 // @TODO: standardize this crap into one function
 517                                 if ( !Hook::isRegistered( 'ShowRawCssJs' )
 518                                         || wfRunHooks( 'ShowRawCssJs', array( ContentHandler::getContentText( $this->mNewContent ), $this->mNewPage, $out ) ) ) { #NOTE: deperecated hook, B/C only
 519                                         // use the content object's own rendering
 520                                         $po = $this->mContentObject->getParserOutput();
 521                                         $out->addHTML( $po->getText() );
 522                                 }
 523                         } elseif( !wfRunHooks( 'ArticleContentViewCustom', array( $this->mNewContent, $this->mNewPage, $out ) ) ) {
 524                                 // Handled by extension
 525                         } elseif( Hooks::isRegistered( 'ArticleViewCustom' )
 526                                         && !wfRunHooks( 'ArticleViewCustom', array( ContentHandler::getContentText( $this->mNewContent ), $this->mNewPage, $out ) ) ) { #NOTE: deperecated hook, B/C only
 527                                 // Handled by extension
 528                         } else {
 529                                 // Normal page
 530                                 if ( $this->getTitle()->equals( $this->mNewPage ) ) {
 531                                         // If the Title stored in the context is the same as the one
 532                                         // of the new revision, we can use its associated WikiPage
 533                                         // object.
 534                                         $wikiPage = $this->getWikiPage();
 535                                 } else {
 536                                         // Otherwise we need to create our own WikiPage object
 537                                         $wikiPage = WikiPage::factory( $this->mNewPage );
 538                                 }
 539
 540                                 $parserOutput = $this->getParserOutput( $wikiPage, $this->mNewRev );
 541
 542                                 # WikiPage::getParserOutput() should not return false, but just in case
 543                                 if( $parserOutput ) {
 544                                         $out->addParserOutput( $parserOutput );
 545                                 }
 546                         }
 547                 }
 548                 # Add redundant patrol link on bottom...
 549                 $out->addHTML( $this->markPatrolledLink() );
 550
 551                 wfProfileOut( __METHOD__ );
 552         }
 553
 554         protected function getParserOutput( WikiPage $page, Revision $rev ) {
 555                 $parserOptions = ParserOptions::newFromContext( $this->getContext() );
 556                 $parserOptions->enableLimitReport();
 557                 $parserOptions->setTidy( true );
 558
 559                 if ( !$rev->isCurrent() || !$rev->getTitle()->quickUserCan( "edit" ) ) {
 560                         $parserOptions->setEditSection( false );
 561                 }
 562
 563                 $parserOutput = $page->getParserOutput( $parserOptions, $rev->getId() );
 564                 return $parserOutput;
 565         }
 566
 567         /**
 568          * Get the diff text, send it to the OutputPage object
 569          * Returns false if the diff could not be generated, otherwise returns true
 570          *
 571          * @return bool
 572          */
 573         function showDiff( $otitle, $ntitle, $notice = '' ) {
 574                 $diff = $this->getDiff( $otitle, $ntitle, $notice );
 575                 if ( $diff === false ) {
 576                         $this->showMissingRevision();
 577                         return false;
 578                 } else {
 579                         $this->showDiffStyle();
 580                         $this->getOutput()->addHTML( $diff );
 581                         return true;
 582                 }
 583         }
 584
 585         /**
 586          * Add style sheets and supporting JS for diff display.
 587          */
 588         function showDiffStyle() {
 589                 $this->getOutput()->addModuleStyles( 'mediawiki.action.history.diff' );
 590         }
 591
 592         /**
 593          * Get complete diff table, including header
 594          *
 595          * @param $otitle Title: old title
 596          * @param $ntitle Title: new title
 597          * @param $notice String: HTML between diff header and body
 598          * @return mixed
 599          */
 600         function getDiff( $otitle, $ntitle, $notice = '' ) {
 601                 $body = $this->getDiffBody();
 602                 if ( $body === false ) {
 603                         return false;
 604                 } else {
 605                         $multi = $this->getMultiNotice();
 606                         return $this->addHeader( $body, $otitle, $ntitle, $multi, $notice );
 607                 }
 608         }
 609
 610         /**
 611          * Get the diff table body, without header
 612          *
 613          * @return mixed (string/false)
 614          */
 615         public function getDiffBody() {
 616                 global $wgMemc;
 617                 wfProfileIn( __METHOD__ );
 618                 $this->mCacheHit = true;
 619                 // Check if the diff should be hidden from this user
 620                 if ( !$this->loadRevisionData() ) {
 621                         wfProfileOut( __METHOD__ );
 622                         return false;
 623                 } elseif ( $this->mOldRev && !$this->mOldRev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 624                         wfProfileOut( __METHOD__ );
 625                         return false;
 626                 } elseif ( $this->mNewRev && !$this->mNewRev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 627                         wfProfileOut( __METHOD__ );
 628                         return false;
 629                 }
 630                 // Short-circuit
 631                 // If mOldRev is false, it means that the
 632                 if ( $this->mOldRev === false || ( $this->mOldRev && $this->mNewRev
 633                         && $this->mOldRev->getID() == $this->mNewRev->getID() ) )
 634                 {
 635                         wfProfileOut( __METHOD__ );
 636                         return '';
 637                 }
 638                 // Cacheable?
 639                 $key = false;
 640                 if ( $this->mOldid && $this->mNewid ) {
 641                         $key = wfMemcKey( 'diff', 'version', MW_DIFF_VERSION,
 642                                 'oldid', $this->mOldid, 'newid', $this->mNewid );
 643                         // Try cache
 644                         if ( !$this->mRefreshCache ) {
 645                                 $difftext = $wgMemc->get( $key );
 646                                 if ( $difftext ) {
 647                                         wfIncrStats( 'diff_cache_hit' );
 648                                         $difftext = $this->localiseLineNumbers( $difftext );
 649                                         $difftext .= "\n<!-- diff cache key $key -->\n";
 650                                         wfProfileOut( __METHOD__ );
 651                                         return $difftext;
 652                                 }
 653                         } // don't try to load but save the result
 654                 }
 655                 $this->mCacheHit = false;
 656
 657                 // Loadtext is permission safe, this just clears out the diff
 658                 if ( !$this->loadText() ) {
 659                         wfProfileOut( __METHOD__ );
 660                         return false;
 661                 }
 662
 663                 $difftext = $this->generateContentDiffBody( $this->mOldContent, $this->mNewContent );
 664
 665                 // Save to cache for 7 days
 666                 if ( !wfRunHooks( 'AbortDiffCache', array( &$this ) ) ) {
 667                         wfIncrStats( 'diff_uncacheable' );
 668                 } elseif ( $key !== false && $difftext !== false ) {
 669                         wfIncrStats( 'diff_cache_miss' );
 670                         $wgMemc->set( $key, $difftext, 7 * 86400 );
 671                 } else {
 672                         wfIncrStats( 'diff_uncacheable' );
 673                 }
 674                 // Replace line numbers with the text in the user's language
 675                 if ( $difftext !== false ) {
 676                         $difftext = $this->localiseLineNumbers( $difftext );
 677                 }
 678                 wfProfileOut( __METHOD__ );
 679                 return $difftext;
 680         }
 681
 682         /**
 683          * Make sure the proper modules are loaded before we try to
 684          * make the diff
 685          */
 686         private function initDiffEngines() {
 687                 global $wgExternalDiffEngine;
 688                 if ( $wgExternalDiffEngine == 'wikidiff' && !function_exists( 'wikidiff_do_diff' ) ) {
 689                         wfProfileIn( __METHOD__ . '-php_wikidiff.so' );
 690                         wfDl( 'php_wikidiff' );
 691                         wfProfileOut( __METHOD__ . '-php_wikidiff.so' );
 692                 }
 693                 elseif ( $wgExternalDiffEngine == 'wikidiff2' && !function_exists( 'wikidiff2_do_diff' ) ) {
 694                         wfProfileIn( __METHOD__ . '-php_wikidiff2.so' );
 695                         wfDl( 'wikidiff2' );
 696                         wfProfileOut( __METHOD__ . '-php_wikidiff2.so' );
 697                 }
 698         }
 699
 700         /**
 701          * Generate a diff, no caching.
 702          *
 703          * Subclasses may override this to provide a
 704          *
 705          * @param $old Content: old content
 706          * @param $new Content: new content
 707          *
 708          * @since 1.WD
 709          */
 710         function generateContentDiffBody( Content $old, Content $new ) {
 711                 #XXX: generate a warning if $old or $new are not instances of TextContent?
 712                 #XXX: fail if $old and $new don't have the same content model? or what?
 713
 714                 $otext = $old->serialize();
 715                 $ntext = $new->serialize();
 716
 717                 #XXX: text should be "already segmented". what does that mean?
 718                 return $this->generateTextDiffBody( $otext, $ntext );
 719         }
 720
 721         /**
 722          * Generate a diff, no caching
 723          *
 724          * @param $otext String: old text, must be already segmented
 725          * @param $ntext String: new text, must be already segmented
 726          * @deprecated since 1.WD, use generateContentDiffBody() instead!
 727          */
 728         function generateDiffBody( $otext, $ntext ) {
 729                 wfDeprecated( __METHOD__, "1.WD" );
 730
 731                 return $this->generateTextDiffBody( $otext, $ntext );
 732         }
 733
 734         /**
 735          * Generate a diff, no caching
 736          *
 737          * @todo move this to TextDifferenceEngine, make DifferenceEngine abstract. At some point.
 738          *
 739          * @param $otext String: old text, must be already segmented
 740          * @param $ntext String: new text, must be already segmented
 741          * @return bool|string
 742          */
 743         function generateTextDiffBody( $otext, $ntext ) {
 744                 global $wgExternalDiffEngine, $wgContLang;
 745
 746                 wfProfileIn( __METHOD__ );
 747
 748                 $otext = str_replace( "\r\n", "\n", $otext );
 749                 $ntext = str_replace( "\r\n", "\n", $ntext );
 750
 751                 $this->initDiffEngines();
 752
 753                 if ( $wgExternalDiffEngine == 'wikidiff' && function_exists( 'wikidiff_do_diff' ) ) {
 754                         # For historical reasons, external diff engine expects
 755                         # input text to be HTML-escaped already
 756                         $otext = htmlspecialchars ( $wgContLang->segmentForDiff( $otext ) );
 757                         $ntext = htmlspecialchars ( $wgContLang->segmentForDiff( $ntext ) );
 758                         wfProfileOut( __METHOD__ );
 759                         return $wgContLang->unsegmentForDiff( wikidiff_do_diff( $otext, $ntext, 2 ) ) .
 760                         $this->debug( 'wikidiff1' );
 761                 }
 762
 763                 if ( $wgExternalDiffEngine == 'wikidiff2' && function_exists( 'wikidiff2_do_diff' ) ) {
 764                         # Better external diff engine, the 2 may some day be dropped
 765                         # This one does the escaping and segmenting itself
 766                         wfProfileIn( 'wikidiff2_do_diff' );
 767                         $text = wikidiff2_do_diff( $otext, $ntext, 2 );
 768                         $text .= $this->debug( 'wikidiff2' );
 769                         wfProfileOut( 'wikidiff2_do_diff' );
 770                         wfProfileOut( __METHOD__ );
 771                         return $text;
 772                 }
 773                 if ( $wgExternalDiffEngine != 'wikidiff3' && $wgExternalDiffEngine !== false ) {
 774                         # Diff via the shell
 775                         $tmpDir = wfTempDir();
 776                         $tempName1 = tempnam( $tmpDir, 'diff_' );
 777                         $tempName2 = tempnam( $tmpDir, 'diff_' );
 778
 779                         $tempFile1 = fopen( $tempName1, "w" );
 780                         if ( !$tempFile1 ) {
 781                                 wfProfileOut( __METHOD__ );
 782                                 return false;
 783                         }
 784                         $tempFile2 = fopen( $tempName2, "w" );
 785                         if ( !$tempFile2 ) {
 786                                 wfProfileOut( __METHOD__ );
 787                                 return false;
 788                         }
 789                         fwrite( $tempFile1, $otext );
 790                         fwrite( $tempFile2, $ntext );
 791                         fclose( $tempFile1 );
 792                         fclose( $tempFile2 );
 793                         $cmd = wfEscapeShellArg( $wgExternalDiffEngine, $tempName1, $tempName2 );
 794                         wfProfileIn( __METHOD__ . "-shellexec" );
 795                         $difftext = wfShellExec( $cmd );
 796                         $difftext .= $this->debug( "external $wgExternalDiffEngine" );
 797                         wfProfileOut( __METHOD__ . "-shellexec" );
 798                         unlink( $tempName1 );
 799                         unlink( $tempName2 );
 800                         wfProfileOut( __METHOD__ );
 801                         return $difftext;
 802                 }
 803
 804                 # Native PHP diff
 805                 $ota = explode( "\n", $wgContLang->segmentForDiff( $otext ) );
 806                 $nta = explode( "\n", $wgContLang->segmentForDiff( $ntext ) );
 807                 $diffs = new Diff( $ota, $nta );
 808                 $formatter = new TableDiffFormatter();
 809                 $difftext = $wgContLang->unsegmentForDiff( $formatter->format( $diffs ) ) .
 810                 wfProfileOut( __METHOD__ );
 811                 return $difftext;
 812         }
 813
 814         /**
 815          * Generate a debug comment indicating diff generating time,
 816          * server node, and generator backend.
 817          * @return string
 818          */
 819         protected function debug( $generator = "internal" ) {
 820                 global $wgShowHostnames;
 821                 if ( !$this->enableDebugComment ) {
 822                         return '';
 823                 }
 824                 $data = array( $generator );
 825                 if ( $wgShowHostnames ) {
 826                         $data[] = wfHostname();
 827                 }
 828                 $data[] = wfTimestamp( TS_DB );
 829                 return "<!-- diff generator: " .
 830                 implode( " ",
 831                 array_map(
 832                                         "htmlspecialchars",
 833                 $data ) ) .
 834                         " -->\n";
 835         }
 836
 837         /**
 838          * Replace line numbers with the text in the user's language
 839          * @return mixed
 840          */
 841         function localiseLineNumbers( $text ) {
 842                 return preg_replace_callback( '/<!--LINE (\d+)-->/',
 843                 array( &$this, 'localiseLineNumbersCb' ), $text );
 844         }
 845
 846         function localiseLineNumbersCb( $matches ) {
 847                 if ( $matches[1] === '1' && $this->mReducedLineNumbers ) return '';
 848                 return $this->msg( 'lineno' )->numParams( $matches[1] )->escaped();
 849         }
 850
 851
 852         /**
 853          * If there are revisions between the ones being compared, return a note saying so.
 854          * @return string
 855          */
 856         function getMultiNotice() {
 857                 if ( !is_object( $this->mOldRev ) || !is_object( $this->mNewRev ) ) {
 858                         return '';
 859                 } elseif ( !$this->mOldPage->equals( $this->mNewPage ) ) {
 860                         // Comparing two different pages? Count would be meaningless.
 861                         return '';
 862                 }
 863
 864                 if ( $this->mOldRev->getTimestamp() > $this->mNewRev->getTimestamp() ) {
 865                         $oldRev = $this->mNewRev; // flip
 866                         $newRev = $this->mOldRev; // flip
 867                 } else { // normal case
 868                         $oldRev = $this->mOldRev;
 869                         $newRev = $this->mNewRev;
 870                 }
 871
 872                 $nEdits = $this->mNewPage->countRevisionsBetween( $oldRev, $newRev );
 873                 if ( $nEdits > 0 ) {
 874                         $limit = 100; // use diff-multi-manyusers if too many users
 875                         $numUsers = $this->mNewPage->countAuthorsBetween( $oldRev, $newRev, $limit );
 876                         return self::intermediateEditsMsg( $nEdits, $numUsers, $limit );
 877                 }
 878                 return ''; // nothing
 879         }
 880
 881         /**
 882          * Get a notice about how many intermediate edits and users there are
 883          * @param $numEdits int
 884          * @param $numUsers int
 885          * @param $limit int
 886          * @return string
 887          */
 888         public static function intermediateEditsMsg( $numEdits, $numUsers, $limit ) {
 889                 if ( $numUsers > $limit ) {
 890                         $msg = 'diff-multi-manyusers';
 891                         $numUsers = $limit;
 892                 } else {
 893                         $msg = 'diff-multi';
 894                 }
 895                 return wfMessage( $msg )->numParams( $numEdits, $numUsers )->parse();
 896         }
 897
 898         /**
 899          * Get a header for a specified revision.
 900          *
 901          * @param $rev Revision
 902          * @param $complete String: 'complete' to get the header wrapped depending
 903          *        the visibility of the revision and a link to edit the page.
 904          * @return String HTML fragment
 905          */
 906         protected function getRevisionHeader( Revision $rev, $complete = '' ) {
 907                 $lang = $this->getLanguage();
 908                 $user = $this->getUser();
 909                 $revtimestamp = $rev->getTimestamp();
 910                 $timestamp = $lang->userTimeAndDate( $revtimestamp, $user );
 911                 $dateofrev = $lang->userDate( $revtimestamp, $user );
 912                 $timeofrev = $lang->userTime( $revtimestamp, $user );
 913
 914                 $header = $this->msg(
 915                         $rev->isCurrent() ? 'currentrev-asof' : 'revisionasof',
 916                         $timestamp,
 917                         $dateofrev,
 918                         $timeofrev
 919                 )->escaped();
 920
 921                 if ( $complete !== 'complete' ) {
 922                         return $header;
 923                 }
 924
 925                 $title = $rev->getTitle();
 926
 927                 $header = Linker::linkKnown( $title, $header, array(),
 928                         array( 'oldid' => $rev->getID() ) );
 929
 930                 if ( $rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 931                         $editQuery = array( 'action' => 'edit' );
 932                         if ( !$rev->isCurrent() ) {
 933                                 $editQuery['oldid'] = $rev->getID();
 934                         }
 935
 936                         $msg = $this->msg( $title->quickUserCan( 'edit', $user ) ? 'editold' : 'viewsourceold' )->escaped();
 937                         $header .= ' ' . $this->msg( 'parentheses' )->rawParams(
 938                                 Linker::linkKnown( $title, $msg, array(), $editQuery ) )->plain();
 939                         if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 940                                 $header = Html::rawElement( 'span', array( 'class' => 'history-deleted' ), $header );
 941                         }
 942                 } else {
 943                         $header = Html::rawElement( 'span', array( 'class' => 'history-deleted' ), $header );
 944                 }
 945
 946                 return $header;
 947         }
 948
 949         /**
 950          * Add the header to a diff body
 951          *
 952          * @return string
 953          */
 954         function addHeader( $diff, $otitle, $ntitle, $multi = '', $notice = '' ) {
 955                 // shared.css sets diff in interface language/dir, but the actual content
 956                 // is often in a different language, mostly the page content language/dir
 957                 $tableClass = 'diff diff-contentalign-' . htmlspecialchars( $this->getDiffLang()->alignStart() );
 958                 $header = "<table class='$tableClass'>";
 959
 960                 if ( !$diff && !$otitle ) {
 961                         $header .= "
 962                         <tr valign='top'>
 963                         <td class='diff-ntitle'>{$ntitle}</td>
 964                         </tr>";
 965                         $multiColspan = 1;
 966                 } else {
 967                         if ( $diff ) { // Safari/Chrome show broken output if cols not used
 968                                 $header .= "
 969                                 <col class='diff-marker' />
 970                                 <col class='diff-content' />
 971                                 <col class='diff-marker' />
 972                                 <col class='diff-content' />";
 973                                 $colspan = 2;
 974                                 $multiColspan = 4;
 975                         } else {
 976                                 $colspan = 1;
 977                                 $multiColspan = 2;
 978                         }
 979                         $header .= "
 980                         <tr valign='top'>
 981                         <td colspan='$colspan' class='diff-otitle'>{$otitle}</td>
 982                         <td colspan='$colspan' class='diff-ntitle'>{$ntitle}</td>
 983                         </tr>";
 984                 }
 985
 986                 if ( $multi != '' ) {
 987                         $header .= "<tr><td colspan='{$multiColspan}' align='center' class='diff-multi'>{$multi}</td></tr>";
 988                 }
 989                 if ( $notice != '' ) {
 990                         $header .= "<tr><td colspan='{$multiColspan}' align='center'>{$notice}</td></tr>";
 991                 }
 992
 993                 return $header . $diff . "</table>";
 994         }
 995
 996         /**
 997          * Use specified text instead of loading from the database
 998          * @deprecated since 1.WD
 999          */
1000         function setText( $oldText, $newText ) { #FIXME: no longer use this, use setContent()!
1001                 wfDeprecated( __METHOD__, "1.WD" );
1002
1003                 $oldContent = ContentHandler::makeContent( $oldText, $this->getTitle() );
1004                 $newContent = ContentHandler::makeContent( $newText, $this->getTitle() );
1005
1006                 $this->setContent( $oldContent, $newContent );
1007         }
1008
1009         /**
1010          * Use specified text instead of loading from the database
1011          * @since 1.WD
1012          */
1013         function setContent( Content $oldContent, Content $newContent ) {
1014                 $this->mOldContent = $oldContent;
1015                 $this->mNewContent = $newContent;
1016
1017                 $this->mTextLoaded = 2;
1018                 $this->mRevisionsLoaded = true;
1019         }
1020
1021         /**
1022          * Set the language in which the diff text is written
1023          * (Defaults to page content language).
1024          * @since 1.19
1025          */
1026         function setTextLanguage( $lang ) {
1027                 $this->mDiffLang = wfGetLangObj( $lang );
1028         }
1029
1030         /**
1031          * Load revision IDs
1032          */
1033         private function loadRevisionIds() {
1034                 if ( $this->mRevisionsIdsLoaded ) {
1035                         return;
1036                 }
1037
1038                 $this->mRevisionsIdsLoaded = true;
1039
1040                 $old = $this->mOldid;
1041                 $new = $this->mNewid;
1042
1043                 if ( $new === 'prev' ) {
1044                         # Show diff between revision $old and the previous one.
1045                         # Get previous one from DB.
1046                         $this->mNewid = intval( $old );
1047                         $this->mOldid = $this->getTitle()->getPreviousRevisionID( $this->mNewid );
1048                 } elseif ( $new === 'next' ) {
1049                         # Show diff between revision $old and the next one.
1050                         # Get next one from DB.
1051                         $this->mOldid = intval( $old );
1052                         $this->mNewid = $this->getTitle()->getNextRevisionID( $this->mOldid );
1053                         if ( $this->mNewid === false ) {
1054                                 # if no result, NewId points to the newest old revision. The only newer
1055                                 # revision is cur, which is "0".
1056                                 $this->mNewid = 0;
1057                         }
1058                 } else {
1059                         $this->mOldid = intval( $old );
1060                         $this->mNewid = intval( $new );
1061                         wfRunHooks( 'NewDifferenceEngine', array( $this->getTitle(), &$this->mOldid, &$this->mNewid, $old, $new ) );
1062                 }
1063         }
1064
1065         /**
1066          * Load revision metadata for the specified articles. If newid is 0, then compare
1067          * the old article in oldid to the current article; if oldid is 0, then
1068          * compare the current article to the immediately previous one (ignoring the
1069          * value of newid).
1070          *
1071          * If oldid is false, leave the corresponding revision object set
1072          * to false. This is impossible via ordinary user input, and is provided for
1073          * API convenience.
1074          *
1075          * @return bool
1076          */
1077         function loadRevisionData() {
1078                 if ( $this->mRevisionsLoaded ) {
1079                         return true;
1080                 }
1081
1082                 // Whether it succeeds or fails, we don't want to try again
1083                 $this->mRevisionsLoaded = true;
1084
1085                 $this->loadRevisionIds();
1086
1087                 // Load the new revision object
1088                 $this->mNewRev = $this->mNewid
1089                         ? Revision::newFromId( $this->mNewid )
1090                         : Revision::newFromTitle( $this->getTitle(), false, Revision::READ_NORMAL );
1091
1092                 if ( !$this->mNewRev instanceof Revision ) {
1093                         return false;
1094                 }
1095
1096                 // Update the new revision ID in case it was 0 (makes life easier doing UI stuff)
1097                 $this->mNewid = $this->mNewRev->getId();
1098                 $this->mNewPage = $this->mNewRev->getTitle();
1099
1100                 // Load the old revision object
1101                 $this->mOldRev = false;
1102                 if ( $this->mOldid ) {
1103                         $this->mOldRev = Revision::newFromId( $this->mOldid );
1104                 } elseif ( $this->mOldid === 0 ) {
1105                         $rev = $this->mNewRev->getPrevious();
1106                         if ( $rev ) {
1107                                 $this->mOldid = $rev->getId();
1108                                 $this->mOldRev = $rev;
1109                         } else {
1110                                 // No previous revision; mark to show as first-version only.
1111                                 $this->mOldid = false;
1112                                 $this->mOldRev = false;
1113                         }
1114                 } /* elseif ( $this->mOldid === false ) leave mOldRev false; */
1115
1116                 if ( is_null( $this->mOldRev ) ) {
1117                         return false;
1118                 }
1119
1120                 if ( $this->mOldRev ) {
1121                         $this->mOldPage = $this->mOldRev->getTitle();
1122                 }
1123
1124                 return true;
1125         }
1126
1127         /**
1128          * Load the text of the revisions, as well as revision data.
1129          *
1130          * @return bool
1131          */
1132         function loadText() {
1133                 if ( $this->mTextLoaded == 2 ) {
1134                         return true;
1135                 } else {
1136                         // Whether it succeeds or fails, we don't want to try again
1137                         $this->mTextLoaded = 2;
1138                 }
1139
1140                 if ( !$this->loadRevisionData() ) {
1141                         return false;
1142                 }
1143                 if ( $this->mOldRev ) {
1144                         $this->mOldContent = $this->mOldRev->getContent( Revision::FOR_THIS_USER );
1145                         if ( $this->mOldContent === false ) {
1146                                 return false;
1147                         }
1148                 }
1149                 if ( $this->mNewRev ) {
1150                         $this->mNewContent = $this->mNewRev->getContent( Revision::FOR_THIS_USER );
1151                         if ( $this->mNewContent === false ) {
1152                                 return false;
1153                         }
1154                 }
1155                 return true;
1156         }
1157
1158         /**
1159          * Load the text of the new revision, not the old one
1160          *
1161          * @return bool
1162          */
1163         function loadNewText() {
1164                 if ( $this->mTextLoaded >= 1 ) {
1165                         return true;
1166                 } else {
1167                         $this->mTextLoaded = 1;
1168                 }
1169                 if ( !$this->loadRevisionData() ) {
1170                         return false;
1171                 }
1172                 $this->mNewContent = $this->mNewRev->getContent( Revision::FOR_THIS_USER );
1173                 return true;
1174         }
1175 }