includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class for viewing MediaWiki article and history.
   9  *
  10  * This maintains WikiPage functions for backwards compatibility.
  11  *
  12  * @TODO: move and rewrite code to an Action class
  13  *
  14  * See design.txt for an overview.
  15  * Note: edit user interface and cache support functions have been
  16  * moved to separate EditPage and HTMLFileCache classes.
  17  *
  18  * @internal documentation reviewed 15 Mar 2010
  19  */
  20 class Article extends Page {
  21         /**@{{
  22          * @private
  23          */
  24
  25         /**
  26          * @var IContextSource
  27          */
  28         protected $mContext;
  29
  30         /**
  31          * @var WikiPage
  32          */
  33         protected $mPage;
  34
  35         /**
  36          * @var ParserOptions: ParserOptions object for $wgUser articles
  37          */
  38         public $mParserOptions;
  39
  40         var $mContent;                    // !<
  41         var $mContentLoaded = false;      // !<
  42         var $mOldId;                      // !<
  43
  44         /**
  45          * @var Title
  46          */
  47         var $mRedirectedFrom = null;
  48
  49         /**
  50          * @var mixed: boolean false or URL string
  51          */
  52         var $mRedirectUrl = false;        // !<
  53         var $mRevIdFetched = 0;           // !<
  54
  55         /**
  56          * @var Revision
  57          */
  58         var $mRevision = null;
  59
  60         /**
  61          * @var ParserOutput
  62          */
  63         var $mParserOutput;
  64
  65         /**@}}*/
  66
  67         /**
  68          * Constructor and clear the article
  69          * @param $title Title Reference to a Title object.
  70          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  71          */
  72         public function __construct( Title $title, $oldId = null ) {
  73                 $this->mOldId = $oldId;
  74                 $this->mPage = $this->newPage( $title );
  75         }
  76
  77         /**
  78          * @param $title Title
  79          * @return WikiPage
  80          */
  81         protected function newPage( Title $title ) {
  82                 return new WikiPage( $title );
  83         }
  84
  85         /**
  86          * Constructor from a page id
  87          * @param $id Int article ID to load
  88          * @return Article|null
  89          */
  90         public static function newFromID( $id ) {
  91                 $t = Title::newFromID( $id );
  92                 # @todo FIXME: Doesn't inherit right
  93                 return $t == null ? null : new self( $t );
  94                 # return $t == null ? null : new static( $t ); // PHP 5.3
  95         }
  96
  97         /**
  98          * Create an Article object of the appropriate class for the given page.
  99          *
 100          * @param $title Title
 101          * @param $context IContextSource
 102          * @return Article object
 103          */
 104         public static function newFromTitle( $title, IContextSource $context ) {
 105                 if ( NS_MEDIA == $title->getNamespace() ) {
 106                         // FIXME: where should this go?
 107                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 108                 }
 109
 110                 $page = null;
 111                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 112                 if ( !$page ) {
 113                         switch( $title->getNamespace() ) {
 114                                 case NS_FILE:
 115                                         $page = new ImagePage( $title );
 116                                         break;
 117                                 case NS_CATEGORY:
 118                                         $page = new CategoryPage( $title );
 119                                         break;
 120                                 default:
 121                                         $page = new Article( $title );
 122                         }
 123                 }
 124                 $page->setContext( $context );
 125
 126                 return $page;
 127         }
 128
 129         /**
 130          * Tell the page view functions that this view was redirected
 131          * from another page on the wiki.
 132          * @param $from Title object.
 133          */
 134         public function setRedirectedFrom( Title $from ) {
 135                 $this->mRedirectedFrom = $from;
 136         }
 137
 138         /**
 139          * Get the title object of the article
 140          * @return Title object of this page
 141          */
 142         public function getTitle() {
 143                 return $this->mPage->getTitle();
 144         }
 145
 146         /**
 147          * Clear the object
 148          * @private
 149          */
 150         public function clear() {
 151                 $this->mContentLoaded = false;
 152
 153                 $this->mRedirectedFrom = null; # Title object if set
 154                 $this->mRevIdFetched = 0;
 155                 $this->mRedirectUrl = false;
 156
 157                 $this->mPage->clear();
 158         }
 159
 160         /**
 161          * Note that getContent/loadContent do not follow redirects anymore.
 162          * If you need to fetch redirectable content easily, try
 163          * the shortcut in Article::followRedirect()
 164          *
 165          * This function has side effects! Do not use this function if you
 166          * only want the real revision text if any.
 167          *
 168          * @return Return the text of this revision
 169          */
 170         public function getContent() {
 171                 global $wgUser;
 172
 173                 wfProfileIn( __METHOD__ );
 174
 175                 if ( $this->mPage->getID() === 0 ) {
 176                         # If this is a MediaWiki:x message, then load the messages
 177                         # and return the message value for x.
 178                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 179                                 $text = $this->getTitle()->getDefaultMessageText();
 180                                 if ( $text === false ) {
 181                                         $text = '';
 182                                 }
 183                         } else {
 184                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 185                         }
 186                         wfProfileOut( __METHOD__ );
 187
 188                         return $text;
 189                 } else {
 190                         $this->loadContent();
 191                         wfProfileOut( __METHOD__ );
 192
 193                         return $this->mContent;
 194                 }
 195         }
 196
 197         /**
 198          * @return int The oldid of the article that is to be shown, 0 for the
 199          *             current revision
 200          */
 201         public function getOldID() {
 202                 if ( is_null( $this->mOldId ) ) {
 203                         $this->mOldId = $this->getOldIDFromRequest();
 204                 }
 205
 206                 return $this->mOldId;
 207         }
 208
 209         /**
 210          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 211          *
 212          * @return int The old id for the request
 213          */
 214         public function getOldIDFromRequest() {
 215                 global $wgRequest;
 216
 217                 $this->mRedirectUrl = false;
 218
 219                 $oldid = $wgRequest->getVal( 'oldid' );
 220
 221                 if ( isset( $oldid ) ) {
 222                         $oldid = intval( $oldid );
 223                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 224                                 $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 225                                 if ( $nextid ) {
 226                                         $oldid = $nextid;
 227                                 } else {
 228                                         $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 229                                 }
 230                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 231                                 $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 232                                 if ( $previd ) {
 233                                         $oldid = $previd;
 234                                 }
 235                         }
 236                 }
 237
 238                 if ( !$oldid ) {
 239                         $oldid = 0;
 240                 }
 241
 242                 return $oldid;
 243         }
 244
 245         /**
 246          * Load the revision (including text) into this object
 247          */
 248         function loadContent() {
 249                 if ( $this->mContentLoaded ) {
 250                         return;
 251                 }
 252
 253                 wfProfileIn( __METHOD__ );
 254
 255                 $this->fetchContent( $this->getOldID() );
 256
 257                 wfProfileOut( __METHOD__ );
 258         }
 259
 260         /**
 261          * Get text of an article from database
 262          * Does *NOT* follow redirects.
 263          *
 264          * @param $oldid Int: 0 for whatever the latest revision is
 265          * @return mixed string containing article contents, or false if null
 266          */
 267         function fetchContent( $oldid = 0 ) {
 268                 if ( $this->mContentLoaded ) {
 269                         return $this->mContent;
 270                 }
 271
 272                 # Pre-fill content with error message so that if something
 273                 # fails we'll have something telling us what we intended.
 274                 $t = $this->getTitle()->getPrefixedText();
 275                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 276                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 277
 278                 if ( $oldid ) {
 279                         $revision = Revision::newFromId( $oldid );
 280                         if ( !$revision ) {
 281                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 282                                 return false;
 283                         }
 284                         // Revision title doesn't match the page title given?
 285                         if ( $this->mPage->getID() != $revision->getPage() ) {
 286                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 287                                 $this->mPage = call_user_func( $function, $revision->getPage() );
 288                                 if ( !$this->mPage->getId() ) {
 289                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 290                                         return false;
 291                                 }
 292                         }
 293                 } else {
 294                         if ( !$this->mPage->getLatest() ) {
 295                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 296                                 return false;
 297                         }
 298
 299                         $revision = $this->mPage->getRevision();
 300                         if ( !$revision ) {
 301                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 302                                 return false;
 303                         }
 304                 }
 305
 306                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 307                 // We should instead work with the Revision object when we need it...
 308                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 309
 310                 $this->mRevIdFetched = $revision->getId();
 311                 $this->mContentLoaded = true;
 312                 $this->mRevision =& $revision;
 313
 314                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 315
 316                 return $this->mContent;
 317         }
 318
 319         /**
 320          * No-op
 321          * @deprecated since 1.18
 322          */
 323         public function forUpdate() {
 324                 wfDeprecated( __METHOD__ );
 325         }
 326
 327         /**
 328          * Returns true if the currently-referenced revision is the current edit
 329          * to this page (and it exists).
 330          * @return bool
 331          */
 332         public function isCurrent() {
 333                 # If no oldid, this is the current version.
 334                 if ( $this->getOldID() == 0 ) {
 335                         return true;
 336                 }
 337
 338                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 339         }
 340
 341         /**
 342          * Use this to fetch the rev ID used on page views
 343          *
 344          * @return int revision ID of last article revision
 345          */
 346         public function getRevIdFetched() {
 347                 if ( $this->mRevIdFetched ) {
 348                         return $this->mRevIdFetched;
 349                 } else {
 350                         return $this->mPage->getLatest();
 351                 }
 352         }
 353
 354         /**
 355          * This is the default action of the index.php entry point: just view the
 356          * page of the given title.
 357          */
 358         public function view() {
 359                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 360                 global $wgUseFileCache, $wgUseETag;
 361
 362                 wfProfileIn( __METHOD__ );
 363
 364                 # Get variables from query string
 365                 $oldid = $this->getOldID();
 366
 367                 # getOldID may want us to redirect somewhere else
 368                 if ( $this->mRedirectUrl ) {
 369                         $wgOut->redirect( $this->mRedirectUrl );
 370                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 371                         wfProfileOut( __METHOD__ );
 372
 373                         return;
 374                 }
 375
 376                 # Set page title (may be overridden by DISPLAYTITLE)
 377                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 378
 379                 # If we got diff in the query, we want to see a diff page instead of the article.
 380                 if ( $wgRequest->getCheck( 'diff' ) ) {
 381                         wfDebug( __METHOD__ . ": showing diff page\n" );
 382                         $this->showDiffPage();
 383                         wfProfileOut( __METHOD__ );
 384
 385                         return;
 386                 }
 387
 388                 $wgOut->setArticleFlag( true );
 389                 # Allow frames by default
 390                 $wgOut->allowClickjacking();
 391
 392                 $parserCache = ParserCache::singleton();
 393
 394                 $parserOptions = $this->getParserOptions();
 395                 # Render printable version, use printable version cache
 396                 if ( $wgOut->isPrintable() ) {
 397                         $parserOptions->setIsPrintable( true );
 398                         $parserOptions->setEditSection( false );
 399                 } elseif ( $wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 400                         $parserOptions->setEditSection( false );
 401                 }
 402
 403                 # Try client and file cache
 404                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 405                         if ( $wgUseETag ) {
 406                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 407                         }
 408
 409                         # Is it client cached?
 410                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 411                                 wfDebug( __METHOD__ . ": done 304\n" );
 412                                 wfProfileOut( __METHOD__ );
 413
 414                                 return;
 415                         # Try file cache
 416                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 417                                 wfDebug( __METHOD__ . ": done file cache\n" );
 418                                 # tell wgOut that output is taken care of
 419                                 $wgOut->disable();
 420                                 $this->mPage->viewUpdates();
 421                                 wfProfileOut( __METHOD__ );
 422
 423                                 return;
 424                         }
 425                 }
 426
 427                 if ( !$wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 428                         $parserOptions->setEditSection( false );
 429                 }
 430
 431                 # Should the parser cache be used?
 432                 $useParserCache = $this->useParserCache( $oldid );
 433                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 434                 if ( $wgUser->getStubThreshold() ) {
 435                         wfIncrStats( 'pcache_miss_stub' );
 436                 }
 437
 438                 $wasRedirected = $this->showRedirectedFromHeader();
 439                 $this->showNamespaceHeader();
 440
 441                 # Iterate through the possible ways of constructing the output text.
 442                 # Keep going until $outputDone is set, or we run out of things to do.
 443                 $pass = 0;
 444                 $outputDone = false;
 445                 $this->mParserOutput = false;
 446
 447                 while ( !$outputDone && ++$pass ) {
 448                         switch( $pass ) {
 449                                 case 1:
 450                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 451                                         break;
 452                                 case 2:
 453                                         # Try the parser cache
 454                                         if ( $useParserCache ) {
 455                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 456
 457                                                 if ( $this->mParserOutput !== false ) {
 458                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 459                                                         $wgOut->addParserOutput( $this->mParserOutput );
 460                                                         # Ensure that UI elements requiring revision ID have
 461                                                         # the correct version information.
 462                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 463                                                         $outputDone = true;
 464                                                         # Preload timestamp to avoid a DB hit
 465                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 466                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 467                                                         }
 468                                                 }
 469                                         }
 470                                         break;
 471                                 case 3:
 472                                         $text = $this->getContent();
 473                                         if ( $text === false || $this->mPage->getID() == 0 ) {
 474                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 475                                                 $this->showMissingArticle();
 476                                                 wfProfileOut( __METHOD__ );
 477                                                 return;
 478                                         }
 479
 480                                         # Another whitelist check in case oldid is altering the title
 481                                         if ( !$this->getTitle()->userCanRead() ) {
 482                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 483                                                 $wgOut->loginToUse();
 484                                                 $wgOut->output();
 485                                                 $wgOut->disable();
 486                                                 wfProfileOut( __METHOD__ );
 487                                                 return;
 488                                         }
 489
 490                                         # Are we looking at an old revision
 491                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 492                                                 $this->setOldSubtitle( $oldid );
 493
 494                                                 if ( !$this->showDeletedRevisionHeader() ) {
 495                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 496                                                         wfProfileOut( __METHOD__ );
 497                                                         return;
 498                                                 }
 499
 500                                                 # If this "old" version is the current, then try the parser cache...
 501                                                 if ( $oldid === $this->mPage->getLatest() && $this->useParserCache( false ) ) {
 502                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 503                                                         if ( $this->mParserOutput ) {
 504                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 505                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 506                                                                 $wgOut->setRevisionId( $this->mPage->getLatest() );
 507                                                                 $outputDone = true;
 508                                                                 break;
 509                                                         }
 510                                                 }
 511                                         }
 512
 513                                         # Ensure that UI elements requiring revision ID have
 514                                         # the correct version information.
 515                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 516
 517                                         # Pages containing custom CSS or JavaScript get special treatment
 518                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 519                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 520                                                 $this->showCssOrJsPage();
 521                                                 $outputDone = true;
 522                                         } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 523                                                 # Allow extensions do their own custom view for certain pages
 524                                                 $outputDone = true;
 525                                         } else {
 526                                                 $rt = Title::newFromRedirectArray( $text );
 527                                                 if ( $rt ) {
 528                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 529                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 530                                                         # Don't append the subtitle if this was an old revision
 531                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 532                                                         # Parse just to get categories, displaytitle, etc.
 533                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 534                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 535                                                         $outputDone = true;
 536                                                 }
 537                                         }
 538                                         break;
 539                                 case 4:
 540                                         # Run the parse, protected by a pool counter
 541                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 542
 543                                         $key = $parserCache->getKey( $this, $parserOptions );
 544                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 545
 546                                         if ( !$poolArticleView->execute() ) {
 547                                                 # Connection or timeout error
 548                                                 wfProfileOut( __METHOD__ );
 549                                                 return;
 550                                         } else {
 551                                                 $outputDone = true;
 552                                         }
 553                                         break;
 554                                 # Should be unreachable, but just in case...
 555                                 default:
 556                                         break 2;
 557                         }
 558                 }
 559
 560                 # Get the ParserOutput actually *displayed* here.
 561                 # Note that $this->mParserOutput is the *current* version output.
 562                 $pOutput = ( $outputDone instanceof ParserOutput )
 563                         ? $outputDone // object fetched by hook
 564                         : $this->mParserOutput;
 565
 566                 # Adjust title for main page & pages with displaytitle
 567                 if ( $pOutput ) {
 568                         $this->adjustDisplayTitle( $pOutput );
 569                 }
 570
 571                 # For the main page, overwrite the <title> element with the con-
 572                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 573                 # that's not empty).
 574                 # This message always exists because it is in the i18n files
 575                 if ( $this->getTitle()->isMainPage() ) {
 576                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 577                         if ( !$msg->isDisabled() ) {
 578                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 579                         }
 580                 }
 581
 582                 # Check for any __NOINDEX__ tags on the page using $pOutput
 583                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 584                 $wgOut->setIndexPolicy( $policy['index'] );
 585                 $wgOut->setFollowPolicy( $policy['follow'] );
 586
 587                 $this->showViewFooter();
 588                 $this->mPage->viewUpdates();
 589
 590                 wfProfileOut( __METHOD__ );
 591         }
 592
 593         /**
 594          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 595          * @param $pOutput ParserOutput
 596          */
 597         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 598                 global $wgOut;
 599                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 600                 $titleText = $pOutput->getTitleText();
 601                 if ( strval( $titleText ) !== '' ) {
 602                         $wgOut->setPageTitle( $titleText );
 603                 }
 604         }
 605
 606         /**
 607          * Show a diff page according to current request variables. For use within
 608          * Article::view() only, other callers should use the DifferenceEngine class.
 609          */
 610         public function showDiffPage() {
 611                 global $wgRequest, $wgUser;
 612
 613                 $diff = $wgRequest->getVal( 'diff' );
 614                 $rcid = $wgRequest->getVal( 'rcid' );
 615                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 616                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 617                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 618                 $oldid = $this->getOldID();
 619
 620                 $de = new DifferenceEngine( $this->getTitle(), $oldid, $diff, $rcid, $purge, $unhide );
 621                 // DifferenceEngine directly fetched the revision:
 622                 $this->mRevIdFetched = $de->mNewid;
 623                 $de->showDiffPage( $diffOnly );
 624
 625                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 626                         # Run view updates for current revision only
 627                         $this->mPage->viewUpdates();
 628                 }
 629         }
 630
 631         /**
 632          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 633          * Article::view() only.
 634          *
 635          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 636          * page views.
 637          */
 638         protected function showCssOrJsPage() {
 639                 global $wgOut;
 640
 641                 $dir = $this->getContext()->getLang()->getDir();
 642                 $lang = $this->getContext()->getLang()->getCode();
 643
 644                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 645                         'clearyourcache' );
 646
 647                 // Give hooks a chance to customise the output
 648                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 649                         // Wrap the whole lot in a <pre> and don't parse
 650                         $m = array();
 651                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 652                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 653                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 654                         $wgOut->addHTML( "\n</pre>\n" );
 655                 }
 656         }
 657
 658         /**
 659          * Get the robot policy to be used for the current view
 660          * @param $action String the action= GET parameter
 661          * @param $pOutput ParserOutput
 662          * @return Array the policy that should be set
 663          * TODO: actions other than 'view'
 664          */
 665         public function getRobotPolicy( $action, $pOutput ) {
 666                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 667                 global $wgDefaultRobotPolicy, $wgRequest;
 668
 669                 $ns = $this->getTitle()->getNamespace();
 670
 671                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 672                         # Don't index user and user talk pages for blocked users (bug 11443)
 673                         if ( !$this->getTitle()->isSubpage() ) {
 674                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 675                                         return array(
 676                                                 'index'  => 'noindex',
 677                                                 'follow' => 'nofollow'
 678                                         );
 679                                 }
 680                         }
 681                 }
 682
 683                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 684                         # Non-articles (special pages etc), and old revisions
 685                         return array(
 686                                 'index'  => 'noindex',
 687                                 'follow' => 'nofollow'
 688                         );
 689                 } elseif ( $wgOut->isPrintable() ) {
 690                         # Discourage indexing of printable versions, but encourage following
 691                         return array(
 692                                 'index'  => 'noindex',
 693                                 'follow' => 'follow'
 694                         );
 695                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 696                         # For ?curid=x urls, disallow indexing
 697                         return array(
 698                                 'index'  => 'noindex',
 699                                 'follow' => 'follow'
 700                         );
 701                 }
 702
 703                 # Otherwise, construct the policy based on the various config variables.
 704                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 705
 706                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 707                         # Honour customised robot policies for this namespace
 708                         $policy = array_merge(
 709                                 $policy,
 710                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 711                         );
 712                 }
 713                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 714                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 715                         # a final sanity check that we have really got the parser output.
 716                         $policy = array_merge(
 717                                 $policy,
 718                                 array( 'index' => $pOutput->getIndexPolicy() )
 719                         );
 720                 }
 721
 722                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 723                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 724                         $policy = array_merge(
 725                                 $policy,
 726                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 727                         );
 728                 }
 729
 730                 return $policy;
 731         }
 732
 733         /**
 734          * Converts a String robot policy into an associative array, to allow
 735          * merging of several policies using array_merge().
 736          * @param $policy Mixed, returns empty array on null/false/'', transparent
 737          *            to already-converted arrays, converts String.
 738          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 739          */
 740         public static function formatRobotPolicy( $policy ) {
 741                 if ( is_array( $policy ) ) {
 742                         return $policy;
 743                 } elseif ( !$policy ) {
 744                         return array();
 745                 }
 746
 747                 $policy = explode( ',', $policy );
 748                 $policy = array_map( 'trim', $policy );
 749
 750                 $arr = array();
 751                 foreach ( $policy as $var ) {
 752                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 753                                 $arr['index'] = $var;
 754                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 755                                 $arr['follow'] = $var;
 756                         }
 757                 }
 758
 759                 return $arr;
 760         }
 761
 762         /**
 763          * If this request is a redirect view, send "redirected from" subtitle to
 764          * $wgOut. Returns true if the header was needed, false if this is not a
 765          * redirect view. Handles both local and remote redirects.
 766          *
 767          * @return boolean
 768          */
 769         public function showRedirectedFromHeader() {
 770                 global $wgOut, $wgRequest, $wgRedirectSources;
 771
 772                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 773
 774                 if ( isset( $this->mRedirectedFrom ) ) {
 775                         // This is an internally redirected page view.
 776                         // We'll need a backlink to the source page for navigation.
 777                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 778                                 $redir = Linker::link(
 779                                         $this->mRedirectedFrom,
 780                                         null,
 781                                         array(),
 782                                         array( 'redirect' => 'no' ),
 783                                         array( 'known', 'noclasses' )
 784                                 );
 785
 786                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 787                                 $wgOut->setSubtitle( $s );
 788
 789                                 // Set the fragment if one was specified in the redirect
 790                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 791                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 792                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 793                                 }
 794
 795                                 // Add a <link rel="canonical"> tag
 796                                 $wgOut->addLink( array( 'rel' => 'canonical',
 797                                         'href' => $this->getTitle()->getLocalURL() )
 798                                 );
 799
 800                                 return true;
 801                         }
 802                 } elseif ( $rdfrom ) {
 803                         // This is an externally redirected view, from some other wiki.
 804                         // If it was reported from a trusted site, supply a backlink.
 805                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 806                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 807                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 808                                 $wgOut->setSubtitle( $s );
 809
 810                                 return true;
 811                         }
 812                 }
 813
 814                 return false;
 815         }
 816
 817         /**
 818          * Show a header specific to the namespace currently being viewed, like
 819          * [[MediaWiki:Talkpagetext]]. For Article::view().
 820          */
 821         public function showNamespaceHeader() {
 822                 global $wgOut;
 823
 824                 if ( $this->getTitle()->isTalkPage() ) {
 825                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 826                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 827                         }
 828                 }
 829         }
 830
 831         /**
 832          * Show the footer section of an ordinary page view
 833          */
 834         public function showViewFooter() {
 835                 global $wgOut, $wgUseTrackbacks;
 836
 837                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 838                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 839                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 840                 }
 841
 842                 # If we have been passed an &rcid= parameter, we want to give the user a
 843                 # chance to mark this new article as patrolled.
 844                 $this->showPatrolFooter();
 845
 846                 # Trackbacks
 847                 if ( $wgUseTrackbacks ) {
 848                         $this->addTrackbacks();
 849                 }
 850
 851                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 852
 853         }
 854
 855         /**
 856          * If patrol is possible, output a patrol UI box. This is called from the
 857          * footer section of ordinary page views. If patrol is not possible or not
 858          * desired, does nothing.
 859          */
 860         public function showPatrolFooter() {
 861                 global $wgOut, $wgRequest, $wgUser;
 862
 863                 $rcid = $wgRequest->getVal( 'rcid' );
 864
 865                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 866                         return;
 867                 }
 868
 869                 $token = $wgUser->editToken( $rcid );
 870                 $wgOut->preventClickjacking();
 871
 872                 $wgOut->addHTML(
 873                         "<div class='patrollink'>" .
 874                                 wfMsgHtml(
 875                                         'markaspatrolledlink',
 876                                         Linker::link(
 877                                                 $this->getTitle(),
 878                                                 wfMsgHtml( 'markaspatrolledtext' ),
 879                                                 array(),
 880                                                 array(
 881                                                         'action' => 'markpatrolled',
 882                                                         'rcid' => $rcid,
 883                                                         'token' => $token,
 884                                                 ),
 885                                                 array( 'known', 'noclasses' )
 886                                         )
 887                                 ) .
 888                         '</div>'
 889                 );
 890         }
 891
 892         /**
 893          * Show the error text for a missing article. For articles in the MediaWiki
 894          * namespace, show the default message text. To be called from Article::view().
 895          */
 896         public function showMissingArticle() {
 897                 global $wgOut, $wgRequest, $wgUser;
 898
 899                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 900                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 901                         $parts = explode( '/', $this->getTitle()->getText() );
 902                         $rootPart = $parts[0];
 903                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 904                         $ip = User::isIP( $rootPart );
 905
 906                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 907                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 908                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 909                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 910                                 LogEventsList::showLogExtract(
 911                                         $wgOut,
 912                                         'block',
 913                                         $user->getUserPage()->getPrefixedText(),
 914                                         '',
 915                                         array(
 916                                                 'lim' => 1,
 917                                                 'showIfEmpty' => false,
 918                                                 'msgKey' => array(
 919                                                         'blocked-notice-logextract',
 920                                                         $user->getName() # Support GENDER in notice
 921                                                 )
 922                                         )
 923                                 );
 924                         }
 925                 }
 926
 927                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 928
 929                 # Show delete and move logs
 930                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 931                         array(  'lim' => 10,
 932                                 'conds' => array( "log_action != 'revision'" ),
 933                                 'showIfEmpty' => false,
 934                                 'msgKey' => array( 'moveddeleted-notice' ) )
 935                 );
 936
 937                 # Show error message
 938                 $oldid = $this->getOldID();
 939                 if ( $oldid ) {
 940                         $text = wfMsgNoTrans( 'missing-article',
 941                                 $this->getTitle()->getPrefixedText(),
 942                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 943                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 944                         // Use the default message text
 945                         $text = $this->getTitle()->getDefaultMessageText();
 946                 } else {
 947                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 948                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 949                         $errors = array_merge( $createErrors, $editErrors );
 950
 951                         if ( !count( $errors ) ) {
 952                                 $text = wfMsgNoTrans( 'noarticletext' );
 953                         } else {
 954                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 955                         }
 956                 }
 957                 $text = "<div class='noarticletext'>\n$text\n</div>";
 958
 959                 if ( !$this->mPage->hasViewableContent() ) {
 960                         // If there's no backing content, send a 404 Not Found
 961                         // for better machine handling of broken links.
 962                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 963                 }
 964
 965                 $wgOut->addWikiText( $text );
 966         }
 967
 968         /**
 969          * If the revision requested for view is deleted, check permissions.
 970          * Send either an error message or a warning header to $wgOut.
 971          *
 972          * @return boolean true if the view is allowed, false if not.
 973          */
 974         public function showDeletedRevisionHeader() {
 975                 global $wgOut, $wgRequest;
 976
 977                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 978                         // Not deleted
 979                         return true;
 980                 }
 981
 982                 // If the user is not allowed to see it...
 983                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 984                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 985                                 'rev-deleted-text-permission' );
 986
 987                         return false;
 988                 // If the user needs to confirm that they want to see it...
 989                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 990                         # Give explanation and add a link to view the revision...
 991                         $oldid = intval( $this->getOldID() );
 992                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 993                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 994                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 995                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 996                                 array( $msg, $link ) );
 997
 998                         return false;
 999                 // We are allowed to see...
1000                 } else {
1001                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1002                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1003                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1004
1005                         return true;
1006                 }
1007         }
1008
1009         /**
1010          * Execute the uncached parse for action=view
1011          * @return bool
1012          */
1013         public function doViewParse() {
1014                 global $wgOut;
1015
1016                 $oldid = $this->getOldID();
1017                 $parserOptions = $this->getParserOptions();
1018
1019                 # Render printable version, use printable version cache
1020                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1021
1022                 # Don't show section-edit links on old revisions... this way lies madness.
1023                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
1024                         $parserOptions->setEditSection( false );
1025                 }
1026
1027                 $useParserCache = $this->useParserCache( $oldid );
1028                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1029
1030                 return true;
1031         }
1032
1033         /**
1034          * Try to fetch an expired entry from the parser cache. If it is present,
1035          * output it and return true. If it is not present, output nothing and
1036          * return false. This is used as a callback function for
1037          * PoolCounter::executeProtected().
1038          *
1039          * @return boolean
1040          */
1041         public function tryDirtyCache() {
1042                 global $wgOut;
1043                 $parserCache = ParserCache::singleton();
1044                 $options = $this->getParserOptions();
1045
1046                 if ( $wgOut->isPrintable() ) {
1047                         $options->setIsPrintable( true );
1048                         $options->setEditSection( false );
1049                 }
1050
1051                 $output = $parserCache->getDirty( $this, $options );
1052
1053                 if ( $output ) {
1054                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1055                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1056                         $wgOut->setSquidMaxage( 0 );
1057                         $this->mParserOutput = $output;
1058                         $wgOut->addParserOutput( $output );
1059                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1060
1061                         return true;
1062                 } else {
1063                         wfDebugLog( 'dirty', "dirty missing\n" );
1064                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1065
1066                         return false;
1067                 }
1068         }
1069
1070         /**
1071          * View redirect
1072          *
1073          * @param $target Title|Array of destination(s) to redirect
1074          * @param $appendSubtitle Boolean [optional]
1075          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1076          * @return string containing HMTL with redirect link
1077          */
1078         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1079                 global $wgOut, $wgStylePath;
1080
1081                 if ( !is_array( $target ) ) {
1082                         $target = array( $target );
1083                 }
1084
1085                 $lang = $this->getTitle()->getPageLanguage();
1086                 $imageDir = $lang->getDir();
1087
1088                 if ( $appendSubtitle ) {
1089                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1090                 }
1091
1092                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1093
1094                 /**
1095                  * @var $title Title
1096                  */
1097                 $title = array_shift( $target );
1098
1099                 if ( $forceKnown ) {
1100                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1101                 } else {
1102                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1103                 }
1104
1105                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1106                 $alt = $lang->isRTL() ? '←' : '→';
1107                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1108                 foreach ( $target as $rt ) {
1109                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1110                         if ( $forceKnown ) {
1111                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1112                         } else {
1113                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1114                         }
1115                 }
1116
1117                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1118                 return '<div class="redirectMsg">' .
1119                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1120                         '<span class="redirectText">' . $link . '</span></div>';
1121         }
1122
1123         /**
1124          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1125          */
1126         public function addTrackbacks() {
1127                 global $wgOut;
1128
1129                 $dbr = wfGetDB( DB_SLAVE );
1130                 $tbs = $dbr->select( 'trackbacks',
1131                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1132                         array( 'tb_page' => $this->mPage->getID() )
1133                 );
1134
1135                 if ( !$dbr->numRows( $tbs ) ) {
1136                         return;
1137                 }
1138
1139                 $wgOut->preventClickjacking();
1140
1141                 $tbtext = "";
1142                 foreach ( $tbs as $o ) {
1143                         $rmvtxt = "";
1144
1145                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1146                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1147                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1148                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1149                         }
1150
1151                         $tbtext .= "\n";
1152                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1153                                         $o->tb_title,
1154                                         $o->tb_url,
1155                                         $o->tb_ex,
1156                                         $o->tb_name,
1157                                         $rmvtxt );
1158                 }
1159
1160                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1161         }
1162
1163         /**
1164          * Removes trackback record for current article from trackbacks table
1165          * @deprecated since 1.18
1166          */
1167         public function deletetrackback() {
1168                 return Action::factory( 'deletetrackback', $this )->show();
1169         }
1170
1171         /**
1172          * Handle action=render
1173          */
1174
1175         public function render() {
1176                 global $wgOut;
1177
1178                 $wgOut->setArticleBodyOnly( true );
1179                 $this->view();
1180         }
1181
1182         /**
1183          * Handle action=purge
1184          */
1185         public function purge() {
1186                 return Action::factory( 'purge', $this )->show();
1187         }
1188
1189         /**
1190          * Mark this particular edit/page as patrolled
1191          * @deprecated since 1.18
1192          */
1193         public function markpatrolled() {
1194                 Action::factory( 'markpatrolled', $this )->show();
1195         }
1196
1197         /**
1198          * User-interface handler for the "watch" action.
1199          * Requires Request to pass a token as of 1.18.
1200          * @deprecated since 1.18
1201          */
1202         public function watch() {
1203                 Action::factory( 'watch', $this )->show();
1204         }
1205
1206         /**
1207          * Add this page to $wgUser's watchlist
1208          *
1209          * This is safe to be called multiple times
1210          *
1211          * @return bool true on successful watch operation
1212          * @deprecated since 1.18
1213          */
1214         public function doWatch() {
1215                 global $wgUser;
1216                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1217         }
1218
1219         /**
1220          * User interface handler for the "unwatch" action.
1221          * Requires Request to pass a token as of 1.18.
1222          * @deprecated since 1.18
1223          */
1224         public function unwatch() {
1225                 Action::factory( 'unwatch', $this )->show();
1226         }
1227
1228         /**
1229          * Stop watching a page
1230          * @return bool true on successful unwatch
1231          * @deprecated since 1.18
1232          */
1233         public function doUnwatch() {
1234                 global $wgUser;
1235                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1236         }
1237
1238         /**
1239          * action=protect handler
1240          */
1241         public function protect() {
1242                 $form = new ProtectionForm( $this );
1243                 $form->execute();
1244         }
1245
1246         /**
1247          * action=unprotect handler (alias)
1248          */
1249         public function unprotect() {
1250                 $this->protect();
1251         }
1252
1253         /**
1254          * Info about this page
1255          * Called for ?action=info when $wgAllowPageInfo is on.
1256          */
1257         public function info() {
1258                 Action::factory( 'info', $this )->show();
1259         }
1260
1261         /**
1262          * Overriden by ImagePage class, only present here to avoid a fatal error
1263          * Called for ?action=revert
1264          */
1265         public function revert() {
1266                 Action::factory( 'revert', $this )->show();
1267         }
1268
1269         /**
1270          * User interface for rollback operations
1271          */
1272         public function rollback() {
1273                 Action::factory( 'rollback', $this )->show();
1274         }
1275
1276         /**
1277          * Output a redirect back to the article.
1278          * This is typically used after an edit.
1279          *
1280          * @deprecated in 1.18; call $wgOut->redirect() directly
1281          * @param $noRedir Boolean: add redirect=no
1282          * @param $sectionAnchor String: section to redirect to, including "#"
1283          * @param $extraQuery String: extra query params
1284          */
1285         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1286                 wfDeprecated( __METHOD__ );
1287                 global $wgOut;
1288
1289                 if ( $noRedir ) {
1290                         $query = 'redirect=no';
1291                         if ( $extraQuery )
1292                                 $query .= "&$extraQuery";
1293                 } else {
1294                         $query = $extraQuery;
1295                 }
1296
1297                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1298         }
1299
1300         /**
1301          * UI entry point for page deletion
1302          */
1303         public function delete() {
1304                 global $wgOut, $wgRequest;
1305
1306                 $confirm = $wgRequest->wasPosted() &&
1307                                 $this->getContext()->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1308
1309                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1310                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1311
1312                 $reason = $this->DeleteReasonList;
1313
1314                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
1315                         // Entry from drop down menu + additional comment
1316                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
1317                 } elseif ( $reason == 'other' ) {
1318                         $reason = $this->DeleteReason;
1319                 }
1320
1321                 # Flag to hide all contents of the archived revisions
1322                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $this->getContext()->getUser()->isAllowed( 'suppressrevision' );
1323
1324                 # This code desperately needs to be totally rewritten
1325
1326                 # Read-only check...
1327                 if ( wfReadOnly() ) {
1328                         $wgOut->readOnlyPage();
1329
1330                         return;
1331                 }
1332
1333                 # Check permissions
1334                 $permission_errors = $this->getTitle()->getUserPermissionsErrors( 'delete', $this->getContext()->getUser() );
1335
1336                 if ( count( $permission_errors ) > 0 ) {
1337                         $wgOut->showPermissionsErrorPage( $permission_errors );
1338
1339                         return;
1340                 }
1341
1342                 $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1343
1344                 # Better double-check that it hasn't been deleted yet!
1345                 $dbw = wfGetDB( DB_MASTER );
1346                 $conds = $this->getTitle()->pageCond();
1347                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1348                 if ( $latest === false ) {
1349                         $wgOut->showFatalError(
1350                                 Html::rawElement(
1351                                         'div',
1352                                         array( 'class' => 'error mw-error-cannotdelete' ),
1353                                         wfMsgExt( 'cannotdelete', array( 'parse' ),
1354                                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1355                                 )
1356                         );
1357                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1358                         LogEventsList::showLogExtract(
1359                                 $wgOut,
1360                                 'delete',
1361                                 $this->getTitle()->getPrefixedText()
1362                         );
1363
1364                         return;
1365                 }
1366
1367                 # Hack for big sites
1368                 $bigHistory = $this->mPage->isBigDeletion();
1369                 if ( $bigHistory && !$this->getTitle()->userCan( 'bigdelete' ) ) {
1370                         global $wgLang, $wgDeleteRevisionsLimit;
1371
1372                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1373                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1374
1375                         return;
1376                 }
1377
1378                 if ( $confirm ) {
1379                         $this->doDelete( $reason, $suppress );
1380
1381                         if ( $wgRequest->getCheck( 'wpWatch' ) && $this->getContext()->getUser()->isLoggedIn() ) {
1382                                 $this->doWatch();
1383                         } elseif ( $this->getTitle()->userIsWatching() ) {
1384                                 $this->doUnwatch();
1385                         }
1386
1387                         return;
1388                 }
1389
1390                 // Generate deletion reason
1391                 $hasHistory = false;
1392                 if ( !$reason ) {
1393                         $reason = $this->generateReason( $hasHistory );
1394                 }
1395
1396                 // If the page has a history, insert a warning
1397                 if ( $hasHistory && !$confirm ) {
1398                         global $wgLang;
1399
1400                         $revisions = $this->mPage->estimateRevisionCount();
1401                         // @todo FIXME: i18n issue/patchwork message
1402                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1403                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1404                                 wfMsgHtml( 'word-separator' ) . Linker::link( $this->getTitle(),
1405                                         wfMsgHtml( 'history' ),
1406                                         array( 'rel' => 'archives' ),
1407                                         array( 'action' => 'history' ) ) .
1408                                 '</strong>'
1409                         );
1410
1411                         if ( $bigHistory ) {
1412                                 global $wgDeleteRevisionsLimit;
1413                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1414                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1415                         }
1416                 }
1417
1418                 return $this->confirmDelete( $reason );
1419         }
1420
1421         /**
1422          * Output deletion confirmation dialog
1423          * @todo FIXME: Move to another file?
1424          * @param $reason String: prefilled reason
1425          */
1426         public function confirmDelete( $reason ) {
1427                 global $wgOut;
1428
1429                 wfDebug( "Article::confirmDelete\n" );
1430
1431                 $deleteBackLink = Linker::linkKnown( $this->getTitle() );
1432                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
1433                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1434                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1435
1436                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1437
1438                 if ( $this->getContext()->getUser()->isAllowed( 'suppressrevision' ) ) {
1439                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1440                                         <td></td>
1441                                         <td class='mw-input'><strong>" .
1442                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1443                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1444                                         "</strong></td>
1445                                 </tr>";
1446                 } else {
1447                         $suppress = '';
1448                 }
1449                 $checkWatch = $this->getContext()->getUser()->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1450
1451                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1452                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1453                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1454                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1455                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1456                         "<tr id=\"wpDeleteReasonListRow\">
1457                                 <td class='mw-label'>" .
1458                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1459                                 "</td>
1460                                 <td class='mw-input'>" .
1461                                         Xml::listDropDown( 'wpDeleteReasonList',
1462                                                 wfMsgForContent( 'deletereason-dropdown' ),
1463                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1464                                 "</td>
1465                         </tr>
1466                         <tr id=\"wpDeleteReasonRow\">
1467                                 <td class='mw-label'>" .
1468                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1469                                 "</td>
1470                                 <td class='mw-input'>" .
1471                                 Html::input( 'wpReason', $reason, 'text', array(
1472                                         'size' => '60',
1473                                         'maxlength' => '255',
1474                                         'tabindex' => '2',
1475                                         'id' => 'wpReason',
1476                                         'autofocus'
1477                                 ) ) .
1478                                 "</td>
1479                         </tr>";
1480
1481                 # Disallow watching if user is not logged in
1482                 if ( $this->getContext()->getUser()->isLoggedIn() ) {
1483                         $form .= "
1484                         <tr>
1485                                 <td></td>
1486                                 <td class='mw-input'>" .
1487                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1488                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1489                                 "</td>
1490                         </tr>";
1491                 }
1492
1493                 $form .= "
1494                         $suppress
1495                         <tr>
1496                                 <td></td>
1497                                 <td class='mw-submit'>" .
1498                                         Xml::submitButton( wfMsg( 'deletepage' ),
1499                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1500                                 "</td>
1501                         </tr>" .
1502                         Xml::closeElement( 'table' ) .
1503                         Xml::closeElement( 'fieldset' ) .
1504                         Html::hidden( 'wpEditToken', $this->getContext()->getUser()->editToken() ) .
1505                         Xml::closeElement( 'form' );
1506
1507                         if ( $this->getContext()->getUser()->isAllowed( 'editinterface' ) ) {
1508                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1509                                 $link = Linker::link(
1510                                         $title,
1511                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1512                                         array(),
1513                                         array( 'action' => 'edit' )
1514                                 );
1515                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1516                         }
1517
1518                 $wgOut->addHTML( $form );
1519                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1520                 LogEventsList::showLogExtract( $wgOut, 'delete',
1521                         $this->getTitle()->getPrefixedText()
1522                 );
1523         }
1524
1525         /**
1526          * Perform a deletion and output success or failure messages
1527          * @param $reason
1528          * @param $suppress bool
1529          */
1530         public function doDelete( $reason, $suppress = false ) {
1531                 global $wgOut;
1532
1533                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1534
1535                 $error = '';
1536                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
1537                         $deleted = $this->getTitle()->getPrefixedText();
1538
1539                         $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
1540                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1541
1542                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1543
1544                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1545                         $wgOut->returnToMain( false );
1546                 } else {
1547                         if ( $error == '' ) {
1548                                 $wgOut->showFatalError(
1549                                         Html::rawElement(
1550                                                 'div',
1551                                                 array( 'class' => 'error mw-error-cannotdelete' ),
1552                                                 wfMsgExt( 'cannotdelete', array( 'parse' ),
1553                                                         wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1554                                         )
1555                                 );
1556
1557                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1558
1559                                 LogEventsList::showLogExtract(
1560                                         $wgOut,
1561                                         'delete',
1562                                         $this->getTitle()->getPrefixedText()
1563                                 );
1564                         } else {
1565                                 $wgOut->showFatalError( $error );
1566                         }
1567                 }
1568         }
1569
1570         /**
1571          * Generate the navigation links when browsing through an article revisions
1572          * It shows the information as:
1573          *   Revision as of \<date\>; view current revision
1574          *   \<- Previous version | Next Version -\>
1575          *
1576          * @param $oldid String: revision ID of this article revision
1577          */
1578         public function setOldSubtitle( $oldid = 0 ) {
1579                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1580
1581                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1582                         return;
1583                 }
1584
1585                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1586
1587                 # Cascade unhide param in links for easy deletion browsing
1588                 $extraParams = array();
1589                 if ( $wgRequest->getVal( 'unhide' ) ) {
1590                         $extraParams['unhide'] = 1;
1591                 }
1592
1593                 $revision = Revision::newFromId( $oldid );
1594                 $timestamp = $revision->getTimestamp();
1595
1596                 $current = ( $oldid == $this->mPage->getLatest() );
1597                 $td = $wgLang->timeanddate( $timestamp, true );
1598                 $tddate = $wgLang->date( $timestamp, true );
1599                 $tdtime = $wgLang->time( $timestamp, true );
1600
1601                 $lnk = $current
1602                         ? wfMsgHtml( 'currentrevisionlink' )
1603                         : Linker::link(
1604                                 $this->getTitle(),
1605                                 wfMsgHtml( 'currentrevisionlink' ),
1606                                 array(),
1607                                 $extraParams,
1608                                 array( 'known', 'noclasses' )
1609                         );
1610                 $curdiff = $current
1611                         ? wfMsgHtml( 'diff' )
1612                         : Linker::link(
1613                                 $this->getTitle(),
1614                                 wfMsgHtml( 'diff' ),
1615                                 array(),
1616                                 array(
1617                                         'diff' => 'cur',
1618                                         'oldid' => $oldid
1619                                 ) + $extraParams,
1620                                 array( 'known', 'noclasses' )
1621                         );
1622                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1623                 $prevlink = $prev
1624                         ? Linker::link(
1625                                 $this->getTitle(),
1626                                 wfMsgHtml( 'previousrevision' ),
1627                                 array(),
1628                                 array(
1629                                         'direction' => 'prev',
1630                                         'oldid' => $oldid
1631                                 ) + $extraParams,
1632                                 array( 'known', 'noclasses' )
1633                         )
1634                         : wfMsgHtml( 'previousrevision' );
1635                 $prevdiff = $prev
1636                         ? Linker::link(
1637                                 $this->getTitle(),
1638                                 wfMsgHtml( 'diff' ),
1639                                 array(),
1640                                 array(
1641                                         'diff' => 'prev',
1642                                         'oldid' => $oldid
1643                                 ) + $extraParams,
1644                                 array( 'known', 'noclasses' )
1645                         )
1646                         : wfMsgHtml( 'diff' );
1647                 $nextlink = $current
1648                         ? wfMsgHtml( 'nextrevision' )
1649                         : Linker::link(
1650                                 $this->getTitle(),
1651                                 wfMsgHtml( 'nextrevision' ),
1652                                 array(),
1653                                 array(
1654                                         'direction' => 'next',
1655                                         'oldid' => $oldid
1656                                 ) + $extraParams,
1657                                 array( 'known', 'noclasses' )
1658                         );
1659                 $nextdiff = $current
1660                         ? wfMsgHtml( 'diff' )
1661                         : Linker::link(
1662                                 $this->getTitle(),
1663                                 wfMsgHtml( 'diff' ),
1664                                 array(),
1665                                 array(
1666                                         'diff' => 'next',
1667                                         'oldid' => $oldid
1668                                 ) + $extraParams,
1669                                 array( 'known', 'noclasses' )
1670                         );
1671
1672                 $cdel = '';
1673
1674                 // User can delete revisions or view deleted revisions...
1675                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1676                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1677                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1678                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1679                         } else {
1680                                 $query = array(
1681                                         'type'   => 'revision',
1682                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1683                                         'ids'    => $oldid
1684                                 );
1685                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1686                         }
1687                         $cdel .= ' ';
1688                 }
1689
1690                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1691                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1692
1693                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1694                         ? 'revision-info-current'
1695                         : 'revision-info';
1696
1697                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
1698                         wfMsgExt(
1699                                 $infomsg,
1700                                 array( 'parseinline', 'replaceafter' ),
1701                                 $td,
1702                                 $userlinks,
1703                                 $revision->getID(),
1704                                 $tddate,
1705                                 $tdtime,
1706                                 $revision->getUser()
1707                         ) .
1708                         "</div>\n" .
1709                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1710                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
1711
1712                 $wgOut->setSubtitle( $r );
1713         }
1714
1715         /* Caching functions */
1716
1717         /**
1718          * checkLastModified returns true if it has taken care of all
1719          * output to the client that is necessary for this request.
1720          * (that is, it has sent a cached version of the page)
1721          *
1722          * @return boolean true if cached version send, false otherwise
1723          */
1724         protected function tryFileCache() {
1725                 static $called = false;
1726
1727                 if ( $called ) {
1728                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1729                         return false;
1730                 }
1731
1732                 $called = true;
1733                 if ( $this->isFileCacheable() ) {
1734                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1735                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1736                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1737                                 $cache->loadFromFileCache( $this->getContext() );
1738                                 return true;
1739                         } else {
1740                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1741                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1742                         }
1743                 } else {
1744                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1745                 }
1746
1747                 return false;
1748         }
1749
1750         /**
1751          * Check if the page can be cached
1752          * @return bool
1753          */
1754         public function isFileCacheable() {
1755                 $cacheable = false;
1756
1757                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1758                         $cacheable = $this->mPage->getID()
1759                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1760                         // Extension may have reason to disable file caching on some pages.
1761                         if ( $cacheable ) {
1762                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1763                         }
1764                 }
1765
1766                 return $cacheable;
1767         }
1768
1769         /**#@-*/
1770
1771         /**
1772          * Add the primary page-view wikitext to the output buffer
1773          * Saves the text into the parser cache if possible.
1774          * Updates templatelinks if it is out of date.
1775          *
1776          * @param $text String
1777          * @param $cache Boolean
1778          * @param $parserOptions mixed ParserOptions object, or boolean false
1779          */
1780         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1781                 global $wgOut;
1782
1783                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1784
1785                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1786
1787                 $wgOut->addParserOutput( $this->mParserOutput );
1788         }
1789
1790         /**
1791          * Lightweight method to get the parser output for a page, checking the parser cache
1792          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1793          * consider, so it's not appropriate to use there.
1794          *
1795          * @since 1.16 (r52326) for LiquidThreads
1796          *
1797          * @param $oldid mixed integer Revision ID or null
1798          * @param $user User The relevant user
1799          * @return ParserOutput or false if the given revsion ID is not found
1800          */
1801         public function getParserOutput( $oldid = null, User $user = null ) {
1802                 global $wgEnableParserCache, $wgUser;
1803                 $user = is_null( $user ) ? $wgUser : $user;
1804
1805                 wfProfileIn( __METHOD__ );
1806                 // Should the parser cache be used?
1807                 $useParserCache = $wgEnableParserCache &&
1808                         $user->getStubThreshold() == 0 &&
1809                         $this->mPage->exists() &&
1810                         $oldid === null;
1811
1812                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1813
1814                 if ( $user->getStubThreshold() ) {
1815                         wfIncrStats( 'pcache_miss_stub' );
1816                 }
1817
1818                 if ( $useParserCache ) {
1819                         $options = $this->mPage->makeParserOptions( $user );
1820                         $parserOutput = ParserCache::singleton()->get( $this, $options );
1821                         if ( $parserOutput !== false ) {
1822                                 wfProfileOut( __METHOD__ );
1823                                 return $parserOutput;
1824                         }
1825                 }
1826
1827                 // Cache miss; parse and output it.
1828                 if ( $oldid === null ) {
1829                         $text = $this->mPage->getRawText();
1830                 } else {
1831                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1832                         if ( $rev === null ) {
1833                                 wfProfileOut( __METHOD__ );
1834                                 return false;
1835                         }
1836                         $text = $rev->getText();
1837                 }
1838
1839                 $output = $this->getOutputFromWikitext( $text, $useParserCache );
1840                 wfProfileOut( __METHOD__ );
1841                 return $output;
1842         }
1843
1844         /**
1845          * This does all the heavy lifting for outputWikitext, except it returns the parser
1846          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1847          * say, embedding thread pages within a discussion system (LiquidThreads)
1848          *
1849          * @param $text string
1850          * @param $cache boolean
1851          * @param $parserOptions parsing options, defaults to false
1852          * @return ParserOutput
1853          */
1854         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1855                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1856
1857                 if ( !$parserOptions ) {
1858                         $parserOptions = $this->getParserOptions();
1859                 }
1860
1861                 $time = - wfTime();
1862                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1863                         $parserOptions, true, true, $this->getRevIdFetched() );
1864                 $time += wfTime();
1865
1866                 # Timing hack
1867                 if ( $time > 3 ) {
1868                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1869                                 $this->getTitle()->getPrefixedDBkey() ) );
1870                 }
1871
1872                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1873                         $parserCache = ParserCache::singleton();
1874                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1875                 }
1876
1877                 // Make sure file cache is not used on uncacheable content.
1878                 // Output that has magic words in it can still use the parser cache
1879                 // (if enabled), though it will generally expire sooner.
1880                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1881                         $wgUseFileCache = false;
1882                 }
1883
1884                 if ( $this->isCurrent() ) {
1885                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1886                 }
1887
1888                 return $this->mParserOutput;
1889         }
1890
1891         /**
1892          * Get parser options suitable for rendering the primary article wikitext
1893          * @return ParserOptions|false
1894          */
1895         public function getParserOptions() {
1896                 global $wgUser;
1897                 if ( !$this->mParserOptions ) {
1898                         $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
1899                 }
1900                 // Clone to allow modifications of the return value without affecting cache
1901                 return clone $this->mParserOptions;
1902         }
1903
1904         /**
1905          * Sets the context this Article is executed in
1906          *
1907          * @param $context IContextSource
1908          * @since 1.18
1909          */
1910         public function setContext( $context ) {
1911                 $this->mContext = $context;
1912         }
1913
1914         /**
1915          * Gets the context this Article is executed in
1916          *
1917          * @return IContextSource
1918          * @since 1.18
1919          */
1920         public function getContext() {
1921                 if ( $this->mContext instanceof IContextSource ) {
1922                         return $this->mContext;
1923                 } else {
1924                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1925                         return RequestContext::getMain();
1926                 }
1927         }
1928
1929         /**
1930          * Use PHP's magic __get handler to handle accessing of
1931          * raw WikiPage fields for backwards compatibility.
1932          *
1933          * @param $fname String Field name
1934          */
1935         public function __get( $fname ) {
1936                 if ( property_exists( $this->mPage, $fname ) ) {
1937                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1938                         return $this->mPage->$fname;
1939                 }
1940                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1941         }
1942
1943         /**
1944          * Use PHP's magic __set handler to handle setting of
1945          * raw WikiPage fields for backwards compatibility.
1946          *
1947          * @param $fname String Field name
1948          * @param $fvalue mixed New value
1949          */
1950         public function __set( $fname, $fvalue ) {
1951                 if ( property_exists( $this->mPage, $fname ) ) {
1952                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1953                         $this->mPage->$fname = $fvalue;
1954                 // Note: extensions may want to toss on new fields
1955                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1956                         $this->mPage->$fname = $fvalue;
1957                 } else {
1958                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1959                 }
1960         }
1961
1962         /**
1963          * Use PHP's magic __call handler to transform instance calls to
1964          * WikiPage functions for backwards compatibility.
1965          *
1966          * @param $fname String Name of called method
1967          * @param $args Array Arguments to the method
1968          */
1969         public function __call( $fname, $args ) {
1970                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1971                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1972                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1973                 }
1974                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1975         }
1976
1977         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1978
1979         /**
1980          * @param $limit array
1981          * @param $reason string
1982          * @param $cascade int
1983          * @param $expiry array
1984          * @return bool
1985          */
1986         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1987                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
1988         }
1989
1990         /**
1991          * @param $reason string
1992          * @param $suppress bool
1993          * @param $id int
1994          * @param $commit bool
1995          * @param $error string
1996          * @return bool
1997          */
1998         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1999                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2000         }
2001
2002         /**
2003          * @param $fromP
2004          * @param $summary
2005          * @param $token
2006          * @param $bot
2007          * @param $resultDetails
2008          * @param $user User
2009          * @return array
2010          */
2011         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2012                 global $wgUser;
2013                 $user = is_null( $user ) ? $wgUser : $user;
2014                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2015         }
2016
2017         /**
2018          * @param $fromP
2019          * @param $summary
2020          * @param $bot
2021          * @param $resultDetails
2022          * @param $guser User
2023          * @return array
2024          */
2025         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2026                 global $wgUser;
2027                 $guser = is_null( $guser ) ? $wgUser : $guser;
2028                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2029         }
2030
2031         /**
2032          * @param $hasHistory bool
2033          * @return mixed
2034          */
2035         public function generateReason( &$hasHistory ) {
2036                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2037         }
2038
2039         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2040
2041         /**
2042          * @return array
2043          */
2044         public static function selectFields() {
2045                 return WikiPage::selectFields();
2046         }
2047
2048         /**
2049          * @param $title Title
2050          */
2051         public static function onArticleCreate( $title ) {
2052                 WikiPage::onArticleCreate( $title );
2053         }
2054
2055         /**
2056          * @param $title Title
2057          */
2058         public static function onArticleDelete( $title ) {
2059                 WikiPage::onArticleDelete( $title );
2060         }
2061
2062         /**
2063          * @param $title Title
2064          */
2065         public static function onArticleEdit( $title ) {
2066                 WikiPage::onArticleEdit( $title );
2067         }
2068
2069         /**
2070          * @param $oldtext
2071          * @param $newtext
2072          * @param $flags
2073          * @return string
2074          */
2075         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2076                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2077         }
2078         // ******
2079 }
2080
2081 class PoolWorkArticleView extends PoolCounterWork {
2082
2083         /**
2084          * @var Article
2085          */
2086         private $mArticle;
2087
2088         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2089                 parent::__construct( 'ArticleView', $key );
2090                 $this->mArticle = $article;
2091                 $this->cacheable = $useParserCache;
2092                 $this->parserOptions = $parserOptions;
2093         }
2094
2095         /**
2096          * @return bool
2097          */
2098         function doWork() {
2099                 return $this->mArticle->doViewParse();
2100         }
2101
2102         /**
2103          * @return bool
2104          */
2105         function getCachedWork() {
2106                 global $wgOut;
2107
2108                 $parserCache = ParserCache::singleton();
2109                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2110
2111                 if ( $this->mArticle->mParserOutput !== false ) {
2112                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2113                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2114                         # Ensure that UI elements requiring revision ID have
2115                         # the correct version information.
2116                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2117                         return true;
2118                 }
2119                 return false;
2120         }
2121
2122         /**
2123          * @return bool
2124          */
2125         function fallback() {
2126                 return $this->mArticle->tryDirtyCache();
2127         }
2128
2129         /**
2130          * @param $status Status
2131          */
2132         function error( $status ) {
2133                 global $wgOut;
2134
2135                 $wgOut->clearHTML(); // for release() errors
2136                 $wgOut->enableClientCache( false );
2137                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2138
2139                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2140                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2141
2142                 return false;
2143         }
2144 }