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          * Create an Article object of the appropriate class for the given page.
 131          *
 132          * @param $page WikiPage
 133          * @param $context IContextSource
 134          * @return Article object
 135          */
 136         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 137                 $article = self::newFromTitle( $page->getTitle(), $context );
 138                 $article->mPage = $page; // override to keep process cached vars
 139                 return $article;
 140         }
 141
 142         /**
 143          * Tell the page view functions that this view was redirected
 144          * from another page on the wiki.
 145          * @param $from Title object.
 146          */
 147         public function setRedirectedFrom( Title $from ) {
 148                 $this->mRedirectedFrom = $from;
 149         }
 150
 151         /**
 152          * Get the title object of the article
 153          * @return Title object of this page
 154          */
 155         public function getTitle() {
 156                 return $this->mPage->getTitle();
 157         }
 158
 159         /**
 160          * Clear the object
 161          */
 162         public function clear() {
 163                 $this->mContentLoaded = false;
 164
 165                 $this->mRedirectedFrom = null; # Title object if set
 166                 $this->mRevIdFetched = 0;
 167                 $this->mRedirectUrl = false;
 168
 169                 $this->mPage->clear();
 170         }
 171
 172         /**
 173          * Note that getContent/loadContent do not follow redirects anymore.
 174          * If you need to fetch redirectable content easily, try
 175          * the shortcut in Article::followRedirect()
 176          *
 177          * This function has side effects! Do not use this function if you
 178          * only want the real revision text if any.
 179          *
 180          * @return Return the text of this revision
 181          */
 182         public function getContent() {
 183                 global $wgUser;
 184
 185                 wfProfileIn( __METHOD__ );
 186
 187                 if ( $this->mPage->getID() === 0 ) {
 188                         # If this is a MediaWiki:x message, then load the messages
 189                         # and return the message value for x.
 190                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 191                                 $text = $this->getTitle()->getDefaultMessageText();
 192                                 if ( $text === false ) {
 193                                         $text = '';
 194                                 }
 195                         } else {
 196                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 197                         }
 198                         wfProfileOut( __METHOD__ );
 199
 200                         return $text;
 201                 } else {
 202                         $this->fetchContent();
 203                         wfProfileOut( __METHOD__ );
 204
 205                         return $this->mContent;
 206                 }
 207         }
 208
 209         /**
 210          * @return int The oldid of the article that is to be shown, 0 for the
 211          *             current revision
 212          */
 213         public function getOldID() {
 214                 if ( is_null( $this->mOldId ) ) {
 215                         $this->mOldId = $this->getOldIDFromRequest();
 216                 }
 217
 218                 return $this->mOldId;
 219         }
 220
 221         /**
 222          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 223          *
 224          * @return int The old id for the request
 225          */
 226         public function getOldIDFromRequest() {
 227                 global $wgRequest;
 228
 229                 $this->mRedirectUrl = false;
 230
 231                 $oldid = $wgRequest->getIntOrNull( 'oldid' );
 232
 233                 if ( $oldid === null ) {
 234                         return 0;
 235                 }
 236
 237                 if ( $oldid !== 0 ) {
 238                         # Load the given revision and check whether the page is another one.
 239                         # In that case, update this instance to reflect the change.
 240                         $this->mRevision = Revision::newFromId( $oldid );
 241                         if ( $this->mRevision !== null ) {
 242                                 // Revision title doesn't match the page title given?
 243                                 if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 244                                         $function = array( get_class( $this->mPage ), 'newFromID' );
 245                                         $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 246                                 }
 247                         }
 248                 }
 249
 250                 if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 251                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 252                         if ( $nextid ) {
 253                                 $oldid = $nextid;
 254                         } else {
 255                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 256                         }
 257                 } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 258                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 259                         if ( $previd ) {
 260                                 $oldid = $previd;
 261                         }
 262                 }
 263
 264                 return $oldid;
 265         }
 266
 267         /**
 268          * Load the revision (including text) into this object
 269          *
 270          * @deprecated in 1.19; use fetchContent()
 271          */
 272         function loadContent() {
 273                 $this->fetchContent();
 274         }
 275
 276         /**
 277          * Get text of an article from database
 278          * Does *NOT* follow redirects.
 279          *
 280          * @return mixed string containing article contents, or false if null
 281          */
 282         function fetchContent() {
 283                 if ( $this->mContentLoaded ) {
 284                         return $this->mContent;
 285                 }
 286
 287                 wfProfileIn( __METHOD__ );
 288
 289                 $this->mContentLoaded = true;
 290
 291                 $oldid = $this->getOldID();
 292
 293                 # Pre-fill content with error message so that if something
 294                 # fails we'll have something telling us what we intended.
 295                 $t = $this->getTitle()->getPrefixedText();
 296                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 297                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 298
 299                 if ( $oldid ) {
 300                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 301                         if ( !$this->mRevision ) {
 302                                 $this->mRevision = Revision::newFromId( $oldid );
 303                                 if ( !$this->mRevision ) {
 304                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 305                                         wfProfileOut( __METHOD__ );
 306                                         return false;
 307                                 }
 308                         }
 309                 } else {
 310                         if ( !$this->mPage->getLatest() ) {
 311                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 312                                 wfProfileOut( __METHOD__ );
 313                                 return false;
 314                         }
 315
 316                         $this->mRevision = $this->mPage->getRevision();
 317                         if ( !$this->mRevision ) {
 318                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 319                                 wfProfileOut( __METHOD__ );
 320                                 return false;
 321                         }
 322                 }
 323
 324                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 325                 // We should instead work with the Revision object when we need it...
 326                 $this->mContent = $this->mRevision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 327                 $this->mRevIdFetched = $this->mRevision->getId();
 328
 329                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 330
 331                 wfProfileOut( __METHOD__ );
 332
 333                 return $this->mContent;
 334         }
 335
 336         /**
 337          * No-op
 338          * @deprecated since 1.18
 339          */
 340         public function forUpdate() {
 341                 wfDeprecated( __METHOD__ );
 342         }
 343
 344         /**
 345          * Returns true if the currently-referenced revision is the current edit
 346          * to this page (and it exists).
 347          * @return bool
 348          */
 349         public function isCurrent() {
 350                 # If no oldid, this is the current version.
 351                 if ( $this->getOldID() == 0 ) {
 352                         return true;
 353                 }
 354
 355                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 356         }
 357
 358         /**
 359          * Use this to fetch the rev ID used on page views
 360          *
 361          * @return int revision ID of last article revision
 362          */
 363         public function getRevIdFetched() {
 364                 if ( $this->mRevIdFetched ) {
 365                         return $this->mRevIdFetched;
 366                 } else {
 367                         return $this->mPage->getLatest();
 368                 }
 369         }
 370
 371         /**
 372          * This is the default action of the index.php entry point: just view the
 373          * page of the given title.
 374          */
 375         public function view() {
 376                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 377                 global $wgUseFileCache, $wgUseETag;
 378
 379                 wfProfileIn( __METHOD__ );
 380
 381                 # Get variables from query string
 382                 # As side effect this will load the revision and update the title
 383                 # in a revision ID is passed in the request, so this should remain
 384                 # the first call of this method even if $oldid is used way below.
 385                 $oldid = $this->getOldID();
 386
 387                 # Another whitelist check in case getOldID() is altering the title
 388                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
 389                 if ( count( $permErrors ) ) {
 390                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 391                         wfProfileOut( __METHOD__ );
 392                         throw new PermissionsError( 'read', $permErrors );
 393                 }
 394
 395                 # getOldID() may as well want us to redirect somewhere else
 396                 if ( $this->mRedirectUrl ) {
 397                         $wgOut->redirect( $this->mRedirectUrl );
 398                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 399                         wfProfileOut( __METHOD__ );
 400
 401                         return;
 402                 }
 403
 404                 # If we got diff in the query, we want to see a diff page instead of the article.
 405                 if ( $wgRequest->getCheck( 'diff' ) ) {
 406                         wfDebug( __METHOD__ . ": showing diff page\n" );
 407                         $this->showDiffPage();
 408                         wfProfileOut( __METHOD__ );
 409
 410                         return;
 411                 }
 412
 413                 # Set page title (may be overridden by DISPLAYTITLE)
 414                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 415
 416                 $wgOut->setArticleFlag( true );
 417                 # Allow frames by default
 418                 $wgOut->allowClickjacking();
 419
 420                 $parserCache = ParserCache::singleton();
 421
 422                 $parserOptions = $this->getParserOptions();
 423                 # Render printable version, use printable version cache
 424                 if ( $wgOut->isPrintable() ) {
 425                         $parserOptions->setIsPrintable( true );
 426                         $parserOptions->setEditSection( false );
 427                 } elseif ( !$this->getTitle()->quickUserCan( 'edit' ) ) {
 428                         $parserOptions->setEditSection( false );
 429                 }
 430
 431                 # Try client and file cache
 432                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 433                         if ( $wgUseETag ) {
 434                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 435                         }
 436
 437                         # Is it client cached?
 438                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 439                                 wfDebug( __METHOD__ . ": done 304\n" );
 440                                 wfProfileOut( __METHOD__ );
 441
 442                                 return;
 443                         # Try file cache
 444                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 445                                 wfDebug( __METHOD__ . ": done file cache\n" );
 446                                 # tell wgOut that output is taken care of
 447                                 $wgOut->disable();
 448                                 $this->mPage->viewUpdates();
 449                                 wfProfileOut( __METHOD__ );
 450
 451                                 return;
 452                         }
 453                 }
 454
 455                 # Should the parser cache be used?
 456                 $useParserCache = $this->mPage->isParserCacheUsed( $wgUser, $oldid );
 457                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 458                 if ( $wgUser->getStubThreshold() ) {
 459                         wfIncrStats( 'pcache_miss_stub' );
 460                 }
 461
 462                 $this->showRedirectedFromHeader();
 463                 $this->showNamespaceHeader();
 464
 465                 # Iterate through the possible ways of constructing the output text.
 466                 # Keep going until $outputDone is set, or we run out of things to do.
 467                 $pass = 0;
 468                 $outputDone = false;
 469                 $this->mParserOutput = false;
 470
 471                 while ( !$outputDone && ++$pass ) {
 472                         switch( $pass ) {
 473                                 case 1:
 474                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 475                                         break;
 476                                 case 2:
 477                                         # Early abort if the page doesn't exist
 478                                         if ( !$this->mPage->exists() ) {
 479                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 480                                                 $this->showMissingArticle();
 481                                                 wfProfileOut( __METHOD__ );
 482                                                 return;
 483                                         }
 484
 485                                         # Try the parser cache
 486                                         if ( $useParserCache ) {
 487                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 488
 489                                                 if ( $this->mParserOutput !== false ) {
 490                                                         if ( $oldid ) {
 491                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 492                                                                 $this->setOldSubtitle( $oldid );
 493                                                         } else {
 494                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 495                                                         }
 496                                                         $wgOut->addParserOutput( $this->mParserOutput );
 497                                                         # Ensure that UI elements requiring revision ID have
 498                                                         # the correct version information.
 499                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 500                                                         $outputDone = true;
 501                                                         # Preload timestamp to avoid a DB hit
 502                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 503                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 504                                                         }
 505                                                 }
 506                                         }
 507                                         break;
 508                                 case 3:
 509                                         # This will set $this->mRevision if needed
 510                                         $this->fetchContent();
 511
 512                                         # Are we looking at an old revision
 513                                         if ( $oldid && $this->mRevision ) {
 514                                                 $this->setOldSubtitle( $oldid );
 515
 516                                                 if ( !$this->showDeletedRevisionHeader() ) {
 517                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 518                                                         wfProfileOut( __METHOD__ );
 519                                                         return;
 520                                                 }
 521                                         }
 522
 523                                         # Ensure that UI elements requiring revision ID have
 524                                         # the correct version information.
 525                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 526
 527                                         # Pages containing custom CSS or JavaScript get special treatment
 528                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 529                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 530                                                 $this->showCssOrJsPage();
 531                                                 $outputDone = true;
 532                                         } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 533                                                 # Allow extensions do their own custom view for certain pages
 534                                                 $outputDone = true;
 535                                         } else {
 536                                                 $text = $this->getContent();
 537                                                 $rt = Title::newFromRedirectArray( $text );
 538                                                 if ( $rt ) {
 539                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 540                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 541                                                         $wgOut->addHTML( $this->viewRedirect( $rt ) );
 542                                                         # Parse just to get categories, displaytitle, etc.
 543                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 544                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 545                                                         $outputDone = true;
 546                                                 }
 547                                         }
 548                                         break;
 549                                 case 4:
 550                                         # Run the parse, protected by a pool counter
 551                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 552
 553                                         $key = $parserCache->getKey( $this, $parserOptions );
 554                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 555
 556                                         if ( !$poolArticleView->execute() ) {
 557                                                 # Connection or timeout error
 558                                                 wfProfileOut( __METHOD__ );
 559                                                 return;
 560                                         } else {
 561                                                 $outputDone = true;
 562                                         }
 563                                         break;
 564                                 # Should be unreachable, but just in case...
 565                                 default:
 566                                         break 2;
 567                         }
 568                 }
 569
 570                 # Get the ParserOutput actually *displayed* here.
 571                 # Note that $this->mParserOutput is the *current* version output.
 572                 $pOutput = ( $outputDone instanceof ParserOutput )
 573                         ? $outputDone // object fetched by hook
 574                         : $this->mParserOutput;
 575
 576                 # Adjust title for main page & pages with displaytitle
 577                 if ( $pOutput ) {
 578                         $this->adjustDisplayTitle( $pOutput );
 579                 }
 580
 581                 # For the main page, overwrite the <title> element with the con-
 582                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 583                 # that's not empty).
 584                 # This message always exists because it is in the i18n files
 585                 if ( $this->getTitle()->isMainPage() ) {
 586                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 587                         if ( !$msg->isDisabled() ) {
 588                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 589                         }
 590                 }
 591
 592                 # Check for any __NOINDEX__ tags on the page using $pOutput
 593                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 594                 $wgOut->setIndexPolicy( $policy['index'] );
 595                 $wgOut->setFollowPolicy( $policy['follow'] );
 596
 597                 $this->showViewFooter();
 598                 $this->mPage->viewUpdates();
 599
 600                 wfProfileOut( __METHOD__ );
 601         }
 602
 603         /**
 604          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 605          * @param $pOutput ParserOutput
 606          */
 607         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 608                 global $wgOut;
 609                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 610                 $titleText = $pOutput->getTitleText();
 611                 if ( strval( $titleText ) !== '' ) {
 612                         $wgOut->setPageTitle( $titleText );
 613                 }
 614         }
 615
 616         /**
 617          * Show a diff page according to current request variables. For use within
 618          * Article::view() only, other callers should use the DifferenceEngine class.
 619          */
 620         public function showDiffPage() {
 621                 global $wgRequest, $wgUser;
 622
 623                 $diff = $wgRequest->getVal( 'diff' );
 624                 $rcid = $wgRequest->getVal( 'rcid' );
 625                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 626                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 627                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 628                 $oldid = $this->getOldID();
 629
 630                 $de = new DifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 631                 // DifferenceEngine directly fetched the revision:
 632                 $this->mRevIdFetched = $de->mNewid;
 633                 $de->showDiffPage( $diffOnly );
 634
 635                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 636                         # Run view updates for current revision only
 637                         $this->mPage->viewUpdates();
 638                 }
 639         }
 640
 641         /**
 642          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 643          * Article::view() only.
 644          *
 645          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 646          * page views.
 647          */
 648         protected function showCssOrJsPage() {
 649                 global $wgOut;
 650
 651                 $dir = $this->getContext()->getLang()->getDir();
 652                 $lang = $this->getContext()->getLang()->getCode();
 653
 654                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 655                         'clearyourcache' );
 656
 657                 // Give hooks a chance to customise the output
 658                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 659                         // Wrap the whole lot in a <pre> and don't parse
 660                         $m = array();
 661                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 662                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 663                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 664                         $wgOut->addHTML( "\n</pre>\n" );
 665                 }
 666         }
 667
 668         /**
 669          * Get the robot policy to be used for the current view
 670          * @param $action String the action= GET parameter
 671          * @param $pOutput ParserOutput
 672          * @return Array the policy that should be set
 673          * TODO: actions other than 'view'
 674          */
 675         public function getRobotPolicy( $action, $pOutput ) {
 676                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 677                 global $wgDefaultRobotPolicy, $wgRequest;
 678
 679                 $ns = $this->getTitle()->getNamespace();
 680
 681                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 682                         # Don't index user and user talk pages for blocked users (bug 11443)
 683                         if ( !$this->getTitle()->isSubpage() ) {
 684                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 685                                         return array(
 686                                                 'index'  => 'noindex',
 687                                                 'follow' => 'nofollow'
 688                                         );
 689                                 }
 690                         }
 691                 }
 692
 693                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 694                         # Non-articles (special pages etc), and old revisions
 695                         return array(
 696                                 'index'  => 'noindex',
 697                                 'follow' => 'nofollow'
 698                         );
 699                 } elseif ( $wgOut->isPrintable() ) {
 700                         # Discourage indexing of printable versions, but encourage following
 701                         return array(
 702                                 'index'  => 'noindex',
 703                                 'follow' => 'follow'
 704                         );
 705                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 706                         # For ?curid=x urls, disallow indexing
 707                         return array(
 708                                 'index'  => 'noindex',
 709                                 'follow' => 'follow'
 710                         );
 711                 }
 712
 713                 # Otherwise, construct the policy based on the various config variables.
 714                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 715
 716                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 717                         # Honour customised robot policies for this namespace
 718                         $policy = array_merge(
 719                                 $policy,
 720                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 721                         );
 722                 }
 723                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 724                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 725                         # a final sanity check that we have really got the parser output.
 726                         $policy = array_merge(
 727                                 $policy,
 728                                 array( 'index' => $pOutput->getIndexPolicy() )
 729                         );
 730                 }
 731
 732                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 733                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 734                         $policy = array_merge(
 735                                 $policy,
 736                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 737                         );
 738                 }
 739
 740                 return $policy;
 741         }
 742
 743         /**
 744          * Converts a String robot policy into an associative array, to allow
 745          * merging of several policies using array_merge().
 746          * @param $policy Mixed, returns empty array on null/false/'', transparent
 747          *            to already-converted arrays, converts String.
 748          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 749          */
 750         public static function formatRobotPolicy( $policy ) {
 751                 if ( is_array( $policy ) ) {
 752                         return $policy;
 753                 } elseif ( !$policy ) {
 754                         return array();
 755                 }
 756
 757                 $policy = explode( ',', $policy );
 758                 $policy = array_map( 'trim', $policy );
 759
 760                 $arr = array();
 761                 foreach ( $policy as $var ) {
 762                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 763                                 $arr['index'] = $var;
 764                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 765                                 $arr['follow'] = $var;
 766                         }
 767                 }
 768
 769                 return $arr;
 770         }
 771
 772         /**
 773          * If this request is a redirect view, send "redirected from" subtitle to
 774          * $wgOut. Returns true if the header was needed, false if this is not a
 775          * redirect view. Handles both local and remote redirects.
 776          *
 777          * @return boolean
 778          */
 779         public function showRedirectedFromHeader() {
 780                 global $wgOut, $wgRequest, $wgRedirectSources;
 781
 782                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 783
 784                 if ( isset( $this->mRedirectedFrom ) ) {
 785                         // This is an internally redirected page view.
 786                         // We'll need a backlink to the source page for navigation.
 787                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 788                                 $redir = Linker::linkKnown(
 789                                         $this->mRedirectedFrom,
 790                                         null,
 791                                         array(),
 792                                         array( 'redirect' => 'no' )
 793                                 );
 794
 795                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 796
 797                                 // Set the fragment if one was specified in the redirect
 798                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 799                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 800                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 801                                 }
 802
 803                                 // Add a <link rel="canonical"> tag
 804                                 $wgOut->addLink( array( 'rel' => 'canonical',
 805                                         'href' => $this->getTitle()->getLocalURL() )
 806                                 );
 807
 808                                 return true;
 809                         }
 810                 } elseif ( $rdfrom ) {
 811                         // This is an externally redirected view, from some other wiki.
 812                         // If it was reported from a trusted site, supply a backlink.
 813                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 814                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 815                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 816
 817                                 return true;
 818                         }
 819                 }
 820
 821                 return false;
 822         }
 823
 824         /**
 825          * Show a header specific to the namespace currently being viewed, like
 826          * [[MediaWiki:Talkpagetext]]. For Article::view().
 827          */
 828         public function showNamespaceHeader() {
 829                 global $wgOut;
 830
 831                 if ( $this->getTitle()->isTalkPage() ) {
 832                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 833                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 834                         }
 835                 }
 836         }
 837
 838         /**
 839          * Show the footer section of an ordinary page view
 840          */
 841         public function showViewFooter() {
 842                 global $wgOut, $wgUseTrackbacks;
 843
 844                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 845                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 846                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 847                 }
 848
 849                 # If we have been passed an &rcid= parameter, we want to give the user a
 850                 # chance to mark this new article as patrolled.
 851                 $this->showPatrolFooter();
 852
 853                 # Trackbacks
 854                 if ( $wgUseTrackbacks ) {
 855                         $this->addTrackbacks();
 856                 }
 857
 858                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 859
 860         }
 861
 862         /**
 863          * If patrol is possible, output a patrol UI box. This is called from the
 864          * footer section of ordinary page views. If patrol is not possible or not
 865          * desired, does nothing.
 866          */
 867         public function showPatrolFooter() {
 868                 global $wgOut, $wgRequest, $wgUser;
 869
 870                 $rcid = $wgRequest->getVal( 'rcid' );
 871
 872                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 873                         return;
 874                 }
 875
 876                 $token = $wgUser->getEditToken( $rcid );
 877                 $wgOut->preventClickjacking();
 878
 879                 $wgOut->addHTML(
 880                         "<div class='patrollink'>" .
 881                                 wfMsgHtml(
 882                                         'markaspatrolledlink',
 883                                         Linker::link(
 884                                                 $this->getTitle(),
 885                                                 wfMsgHtml( 'markaspatrolledtext' ),
 886                                                 array(),
 887                                                 array(
 888                                                         'action' => 'markpatrolled',
 889                                                         'rcid' => $rcid,
 890                                                         'token' => $token,
 891                                                 ),
 892                                                 array( 'known', 'noclasses' )
 893                                         )
 894                                 ) .
 895                         '</div>'
 896                 );
 897         }
 898
 899         /**
 900          * Show the error text for a missing article. For articles in the MediaWiki
 901          * namespace, show the default message text. To be called from Article::view().
 902          */
 903         public function showMissingArticle() {
 904                 global $wgOut, $wgRequest, $wgUser;
 905
 906                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 907                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 908                         $parts = explode( '/', $this->getTitle()->getText() );
 909                         $rootPart = $parts[0];
 910                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 911                         $ip = User::isIP( $rootPart );
 912
 913                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 914                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 915                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 916                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 917                                 LogEventsList::showLogExtract(
 918                                         $wgOut,
 919                                         'block',
 920                                         $user->getUserPage()->getPrefixedText(),
 921                                         '',
 922                                         array(
 923                                                 'lim' => 1,
 924                                                 'showIfEmpty' => false,
 925                                                 'msgKey' => array(
 926                                                         'blocked-notice-logextract',
 927                                                         $user->getName() # Support GENDER in notice
 928                                                 )
 929                                         )
 930                                 );
 931                         }
 932                 }
 933
 934                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 935
 936                 # Show delete and move logs
 937                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 938                         array(  'lim' => 10,
 939                                 'conds' => array( "log_action != 'revision'" ),
 940                                 'showIfEmpty' => false,
 941                                 'msgKey' => array( 'moveddeleted-notice' ) )
 942                 );
 943
 944                 # Show error message
 945                 $oldid = $this->getOldID();
 946                 if ( $oldid ) {
 947                         $text = wfMsgNoTrans( 'missing-article',
 948                                 $this->getTitle()->getPrefixedText(),
 949                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 950                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 951                         // Use the default message text
 952                         $text = $this->getTitle()->getDefaultMessageText();
 953                 } else {
 954                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 955                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 956                         $errors = array_merge( $createErrors, $editErrors );
 957
 958                         if ( !count( $errors ) ) {
 959                                 $text = wfMsgNoTrans( 'noarticletext' );
 960                         } else {
 961                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 962                         }
 963                 }
 964                 $text = "<div class='noarticletext'>\n$text\n</div>";
 965
 966                 if ( !$this->mPage->hasViewableContent() ) {
 967                         // If there's no backing content, send a 404 Not Found
 968                         // for better machine handling of broken links.
 969                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 970                 }
 971
 972                 $wgOut->addWikiText( $text );
 973         }
 974
 975         /**
 976          * If the revision requested for view is deleted, check permissions.
 977          * Send either an error message or a warning header to $wgOut.
 978          *
 979          * @return boolean true if the view is allowed, false if not.
 980          */
 981         public function showDeletedRevisionHeader() {
 982                 global $wgOut, $wgRequest;
 983
 984                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 985                         // Not deleted
 986                         return true;
 987                 }
 988
 989                 // If the user is not allowed to see it...
 990                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 991                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 992                                 'rev-deleted-text-permission' );
 993
 994                         return false;
 995                 // If the user needs to confirm that they want to see it...
 996                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 997                         # Give explanation and add a link to view the revision...
 998                         $oldid = intval( $this->getOldID() );
 999                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
1000                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1001                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1002                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1003                                 array( $msg, $link ) );
1004
1005                         return false;
1006                 // We are allowed to see...
1007                 } else {
1008                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1009                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1010                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1011
1012                         return true;
1013                 }
1014         }
1015
1016         /**
1017          * Generate the navigation links when browsing through an article revisions
1018          * It shows the information as:
1019          *   Revision as of \<date\>; view current revision
1020          *   \<- Previous version | Next Version -\>
1021          *
1022          * @param $oldid String: revision ID of this article revision
1023          */
1024         public function setOldSubtitle( $oldid = 0 ) {
1025                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1026
1027                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1028                         return;
1029                 }
1030
1031                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1032
1033                 # Cascade unhide param in links for easy deletion browsing
1034                 $extraParams = array();
1035                 if ( $wgRequest->getVal( 'unhide' ) ) {
1036                         $extraParams['unhide'] = 1;
1037                 }
1038
1039                 $revision = Revision::newFromId( $oldid );
1040                 $timestamp = $revision->getTimestamp();
1041
1042                 $current = ( $oldid == $this->mPage->getLatest() );
1043                 $td = $wgLang->timeanddate( $timestamp, true );
1044                 $tddate = $wgLang->date( $timestamp, true );
1045                 $tdtime = $wgLang->time( $timestamp, true );
1046
1047                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1048                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1049
1050                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1051                         ? 'revision-info-current'
1052                         : 'revision-info';
1053
1054                 $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1055                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1056                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1057
1058                 $lnk = $current
1059                         ? wfMsgHtml( 'currentrevisionlink' )
1060                         : Linker::link(
1061                                 $this->getTitle(),
1062                                 wfMsgHtml( 'currentrevisionlink' ),
1063                                 array(),
1064                                 $extraParams,
1065                                 array( 'known', 'noclasses' )
1066                         );
1067                 $curdiff = $current
1068                         ? wfMsgHtml( 'diff' )
1069                         : Linker::link(
1070                                 $this->getTitle(),
1071                                 wfMsgHtml( 'diff' ),
1072                                 array(),
1073                                 array(
1074                                         'diff' => 'cur',
1075                                         'oldid' => $oldid
1076                                 ) + $extraParams,
1077                                 array( 'known', 'noclasses' )
1078                         );
1079                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1080                 $prevlink = $prev
1081                         ? Linker::link(
1082                                 $this->getTitle(),
1083                                 wfMsgHtml( 'previousrevision' ),
1084                                 array(),
1085                                 array(
1086                                         'direction' => 'prev',
1087                                         'oldid' => $oldid
1088                                 ) + $extraParams,
1089                                 array( 'known', 'noclasses' )
1090                         )
1091                         : wfMsgHtml( 'previousrevision' );
1092                 $prevdiff = $prev
1093                         ? Linker::link(
1094                                 $this->getTitle(),
1095                                 wfMsgHtml( 'diff' ),
1096                                 array(),
1097                                 array(
1098                                         'diff' => 'prev',
1099                                         'oldid' => $oldid
1100                                 ) + $extraParams,
1101                                 array( 'known', 'noclasses' )
1102                         )
1103                         : wfMsgHtml( 'diff' );
1104                 $nextlink = $current
1105                         ? wfMsgHtml( 'nextrevision' )
1106                         : Linker::link(
1107                                 $this->getTitle(),
1108                                 wfMsgHtml( 'nextrevision' ),
1109                                 array(),
1110                                 array(
1111                                         'direction' => 'next',
1112                                         'oldid' => $oldid
1113                                 ) + $extraParams,
1114                                 array( 'known', 'noclasses' )
1115                         );
1116                 $nextdiff = $current
1117                         ? wfMsgHtml( 'diff' )
1118                         : Linker::link(
1119                                 $this->getTitle(),
1120                                 wfMsgHtml( 'diff' ),
1121                                 array(),
1122                                 array(
1123                                         'diff' => 'next',
1124                                         'oldid' => $oldid
1125                                 ) + $extraParams,
1126                                 array( 'known', 'noclasses' )
1127                         );
1128
1129                 $cdel = '';
1130
1131                 // User can delete revisions or view deleted revisions...
1132                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1133                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1134                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1135                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1136                         } else {
1137                                 $query = array(
1138                                         'type'   => 'revision',
1139                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1140                                         'ids'    => $oldid
1141                                 );
1142                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1143                         }
1144                         $cdel .= ' ';
1145                 }
1146
1147                 $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1148                         wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1149                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
1150         }
1151
1152         /**
1153          * Execute the uncached parse for action=view
1154          * @return bool
1155          */
1156         public function doViewParse() {
1157                 global $wgOut;
1158
1159                 $oldid = $this->getOldID();
1160                 $parserOptions = $this->getParserOptions();
1161
1162                 # Render printable version, use printable version cache
1163                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1164
1165                 # Don't show section-edit links on old revisions... this way lies madness.
1166                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
1167                         $parserOptions->setEditSection( false );
1168                 }
1169
1170                 $useParserCache = $this->useParserCache( $oldid );
1171                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1172
1173                 return true;
1174         }
1175
1176         /**
1177          * Try to fetch an expired entry from the parser cache. If it is present,
1178          * output it and return true. If it is not present, output nothing and
1179          * return false. This is used as a callback function for
1180          * PoolCounter::executeProtected().
1181          *
1182          * @return boolean
1183          */
1184         public function tryDirtyCache() {
1185                 global $wgOut;
1186                 $parserCache = ParserCache::singleton();
1187                 $options = $this->getParserOptions();
1188
1189                 if ( $wgOut->isPrintable() ) {
1190                         $options->setIsPrintable( true );
1191                         $options->setEditSection( false );
1192                 }
1193
1194                 $output = $parserCache->getDirty( $this, $options );
1195
1196                 if ( $output ) {
1197                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1198                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1199                         $wgOut->setSquidMaxage( 0 );
1200                         $this->mParserOutput = $output;
1201                         $wgOut->addParserOutput( $output );
1202                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1203
1204                         return true;
1205                 } else {
1206                         wfDebugLog( 'dirty', "dirty missing\n" );
1207                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1208
1209                         return false;
1210                 }
1211         }
1212
1213         /**
1214          * View redirect
1215          *
1216          * @param $target Title|Array of destination(s) to redirect
1217          * @param $appendSubtitle Boolean [optional]
1218          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1219          * @return string containing HMTL with redirect link
1220          */
1221         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1222                 global $wgOut, $wgStylePath;
1223
1224                 if ( !is_array( $target ) ) {
1225                         $target = array( $target );
1226                 }
1227
1228                 $lang = $this->getTitle()->getPageLanguage();
1229                 $imageDir = $lang->getDir();
1230
1231                 if ( $appendSubtitle ) {
1232                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1233                 }
1234
1235                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1236
1237                 /**
1238                  * @var $title Title
1239                  */
1240                 $title = array_shift( $target );
1241
1242                 if ( $forceKnown ) {
1243                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1244                 } else {
1245                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1246                 }
1247
1248                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1249                 $alt = $lang->isRTL() ? '←' : '→';
1250                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1251                 foreach ( $target as $rt ) {
1252                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1253                         if ( $forceKnown ) {
1254                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1255                         } else {
1256                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1257                         }
1258                 }
1259
1260                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1261                 return '<div class="redirectMsg">' .
1262                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1263                         '<span class="redirectText">' . $link . '</span></div>';
1264         }
1265
1266         /**
1267          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1268          */
1269         public function addTrackbacks() {
1270                 global $wgOut;
1271
1272                 $dbr = wfGetDB( DB_SLAVE );
1273                 $tbs = $dbr->select( 'trackbacks',
1274                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1275                         array( 'tb_page' => $this->mPage->getID() )
1276                 );
1277
1278                 if ( !$dbr->numRows( $tbs ) ) {
1279                         return;
1280                 }
1281
1282                 $wgOut->preventClickjacking();
1283
1284                 $tbtext = "";
1285                 foreach ( $tbs as $o ) {
1286                         $rmvtxt = "";
1287
1288                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1289                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1290                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->getEditToken() ) );
1291                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1292                         }
1293
1294                         $tbtext .= "\n";
1295                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1296                                         $o->tb_title,
1297                                         $o->tb_url,
1298                                         $o->tb_ex,
1299                                         $o->tb_name,
1300                                         $rmvtxt );
1301                 }
1302
1303                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1304         }
1305
1306         /**
1307          * Handle action=render
1308          */
1309         public function render() {
1310                 global $wgOut;
1311
1312                 $wgOut->setArticleBodyOnly( true );
1313                 $this->view();
1314         }
1315
1316         /**
1317          * action=protect handler
1318          */
1319         public function protect() {
1320                 $form = new ProtectionForm( $this );
1321                 $form->execute();
1322         }
1323
1324         /**
1325          * action=unprotect handler (alias)
1326          */
1327         public function unprotect() {
1328                 $this->protect();
1329         }
1330
1331         /**
1332          * UI entry point for page deletion
1333          */
1334         public function delete() {
1335                 global $wgOut, $wgRequest, $wgLang;
1336
1337                 # This code desperately needs to be totally rewritten
1338
1339                 $title = $this->getTitle();
1340                 $user = $this->getContext()->getUser();
1341
1342                 # Check permissions
1343                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1344                 if ( count( $permission_errors ) ) {
1345                         throw new PermissionsError( 'delete', $permission_errors );
1346                 }
1347
1348                 # Read-only check...
1349                 if ( wfReadOnly() ) {
1350                         throw new ReadOnlyError;
1351                 }
1352
1353                 # Better double-check that it hasn't been deleted yet!
1354                 $dbw = wfGetDB( DB_MASTER );
1355                 $conds = $title->pageCond();
1356                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1357                 if ( $latest === false ) {
1358                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1359                         $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1360                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1361                                 );
1362                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1363                         LogEventsList::showLogExtract(
1364                                 $wgOut,
1365                                 'delete',
1366                                 $title->getPrefixedText()
1367                         );
1368
1369                         return;
1370                 }
1371
1372                 # Hack for big sites
1373                 $bigHistory = $this->mPage->isBigDeletion();
1374                 if ( $bigHistory && !$title->userCan( 'bigdelete' ) ) {
1375                         global $wgDeleteRevisionsLimit;
1376
1377                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1378                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1379                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1380
1381                         return;
1382                 }
1383
1384                 $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1385                 $deleteReason = $wgRequest->getText( 'wpReason' );
1386
1387                 if ( $deleteReasonList == 'other' ) {
1388                         $reason = $deleteReason;
1389                 } elseif ( $deleteReason != '' ) {
1390                         // Entry from drop down menu + additional comment
1391                         $reason = $deleteReasonList . wfMsgForContent( 'colon-separator' ) . $deleteReason;
1392                 } else {
1393                         $reason = $deleteReasonList;
1394                 }
1395
1396                 if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
1397                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1398                 {
1399                         # Flag to hide all contents of the archived revisions
1400                         $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1401
1402                         $this->doDelete( $reason, $suppress );
1403
1404                         if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
1405                                 $this->doWatch();
1406                         } elseif ( $title->userIsWatching() ) {
1407                                 $this->doUnwatch();
1408                         }
1409
1410                         return;
1411                 }
1412
1413                 // Generate deletion reason
1414                 $hasHistory = false;
1415                 if ( !$reason ) {
1416                         $reason = $this->generateReason( $hasHistory );
1417                 }
1418
1419                 // If the page has a history, insert a warning
1420                 if ( $hasHistory ) {
1421                         $revisions = $this->mPage->estimateRevisionCount();
1422                         // @todo FIXME: i18n issue/patchwork message
1423                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1424                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1425                                 wfMsgHtml( 'word-separator' ) . Linker::link( $title,
1426                                         wfMsgHtml( 'history' ),
1427                                         array( 'rel' => 'archives' ),
1428                                         array( 'action' => 'history' ) ) .
1429                                 '</strong>'
1430                         );
1431
1432                         if ( $bigHistory ) {
1433                                 global $wgDeleteRevisionsLimit;
1434                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1435                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1436                         }
1437                 }
1438
1439                 return $this->confirmDelete( $reason );
1440         }
1441
1442         /**
1443          * Output deletion confirmation dialog
1444          * @todo FIXME: Move to another file?
1445          * @param $reason String: prefilled reason
1446          */
1447         public function confirmDelete( $reason ) {
1448                 global $wgOut;
1449
1450                 wfDebug( "Article::confirmDelete\n" );
1451
1452                 $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1453                 $wgOut->addBacklinkSubtitle( $this->getTitle() );
1454                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1455                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1456
1457                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1458
1459                 $user = $this->getContext()->getUser();
1460
1461                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1462                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1463                                         <td></td>
1464                                         <td class='mw-input'><strong>" .
1465                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1466                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1467                                         "</strong></td>
1468                                 </tr>";
1469                 } else {
1470                         $suppress = '';
1471                 }
1472                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1473
1474                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1475                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1476                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1477                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1478                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1479                         "<tr id=\"wpDeleteReasonListRow\">
1480                                 <td class='mw-label'>" .
1481                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1482                                 "</td>
1483                                 <td class='mw-input'>" .
1484                                         Xml::listDropDown( 'wpDeleteReasonList',
1485                                                 wfMsgForContent( 'deletereason-dropdown' ),
1486                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1487                                 "</td>
1488                         </tr>
1489                         <tr id=\"wpDeleteReasonRow\">
1490                                 <td class='mw-label'>" .
1491                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1492                                 "</td>
1493                                 <td class='mw-input'>" .
1494                                 Html::input( 'wpReason', $reason, 'text', array(
1495                                         'size' => '60',
1496                                         'maxlength' => '255',
1497                                         'tabindex' => '2',
1498                                         'id' => 'wpReason',
1499                                         'autofocus'
1500                                 ) ) .
1501                                 "</td>
1502                         </tr>";
1503
1504                 # Disallow watching if user is not logged in
1505                 if ( $user->isLoggedIn() ) {
1506                         $form .= "
1507                         <tr>
1508                                 <td></td>
1509                                 <td class='mw-input'>" .
1510                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1511                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1512                                 "</td>
1513                         </tr>";
1514                 }
1515
1516                 $form .= "
1517                         $suppress
1518                         <tr>
1519                                 <td></td>
1520                                 <td class='mw-submit'>" .
1521                                         Xml::submitButton( wfMsg( 'deletepage' ),
1522                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1523                                 "</td>
1524                         </tr>" .
1525                         Xml::closeElement( 'table' ) .
1526                         Xml::closeElement( 'fieldset' ) .
1527                         Html::hidden( 'wpEditToken', $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1528                         Xml::closeElement( 'form' );
1529
1530                         if ( $user->isAllowed( 'editinterface' ) ) {
1531                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1532                                 $link = Linker::link(
1533                                         $title,
1534                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1535                                         array(),
1536                                         array( 'action' => 'edit' )
1537                                 );
1538                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1539                         }
1540
1541                 $wgOut->addHTML( $form );
1542                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1543                 LogEventsList::showLogExtract( $wgOut, 'delete',
1544                         $this->getTitle()->getPrefixedText()
1545                 );
1546         }
1547
1548         /**
1549          * Perform a deletion and output success or failure messages
1550          * @param $reason
1551          * @param $suppress bool
1552          */
1553         public function doDelete( $reason, $suppress = false ) {
1554                 global $wgOut;
1555
1556                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1557
1558                 $error = '';
1559                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, true, $error ) ) {
1560                         $deleted = $this->getTitle()->getPrefixedText();
1561
1562                         $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
1563                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1564
1565                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1566
1567                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1568                         $wgOut->returnToMain( false );
1569                 } else {
1570                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1571                         if ( $error == '' ) {
1572                                 $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1573                                         array( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1574                                 );
1575                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1576
1577                                 LogEventsList::showLogExtract(
1578                                         $wgOut,
1579                                         'delete',
1580                                         $this->getTitle()->getPrefixedText()
1581                                 );
1582                         } else {
1583                                 $wgOut->addHTML( $error );
1584                         }
1585                 }
1586         }
1587
1588         /* Caching functions */
1589
1590         /**
1591          * checkLastModified returns true if it has taken care of all
1592          * output to the client that is necessary for this request.
1593          * (that is, it has sent a cached version of the page)
1594          *
1595          * @return boolean true if cached version send, false otherwise
1596          */
1597         protected function tryFileCache() {
1598                 static $called = false;
1599
1600                 if ( $called ) {
1601                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1602                         return false;
1603                 }
1604
1605                 $called = true;
1606                 if ( $this->isFileCacheable() ) {
1607                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1608                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1609                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1610                                 $cache->loadFromFileCache( $this->getContext() );
1611                                 return true;
1612                         } else {
1613                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1614                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1615                         }
1616                 } else {
1617                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1618                 }
1619
1620                 return false;
1621         }
1622
1623         /**
1624          * Check if the page can be cached
1625          * @return bool
1626          */
1627         public function isFileCacheable() {
1628                 $cacheable = false;
1629
1630                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1631                         $cacheable = $this->mPage->getID()
1632                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1633                         // Extension may have reason to disable file caching on some pages.
1634                         if ( $cacheable ) {
1635                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1636                         }
1637                 }
1638
1639                 return $cacheable;
1640         }
1641
1642         /**#@-*/
1643
1644         /**
1645          * Add the primary page-view wikitext to the output buffer
1646          * Saves the text into the parser cache if possible.
1647          * Updates templatelinks if it is out of date.
1648          *
1649          * @param $text String
1650          * @param $cache Boolean
1651          * @param $parserOptions mixed ParserOptions object, or boolean false
1652          */
1653         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1654                 global $wgOut;
1655
1656                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1657
1658                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1659
1660                 $wgOut->addParserOutput( $this->mParserOutput );
1661         }
1662
1663         /**
1664          * Lightweight method to get the parser output for a page, checking the parser cache
1665          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1666          * consider, so it's not appropriate to use there.
1667          *
1668          * @since 1.16 (r52326) for LiquidThreads
1669          *
1670          * @param $oldid mixed integer Revision ID or null
1671          * @param $user User The relevant user
1672          * @return ParserOutput or false if the given revsion ID is not found
1673          */
1674         public function getParserOutput( $oldid = null, User $user = null ) {
1675                 global $wgEnableParserCache, $wgUser;
1676                 $user = is_null( $user ) ? $wgUser : $user;
1677
1678                 wfProfileIn( __METHOD__ );
1679                 // Should the parser cache be used?
1680                 $useParserCache = $wgEnableParserCache &&
1681                         $user->getStubThreshold() == 0 &&
1682                         $this->mPage->exists() &&
1683                         $oldid === null;
1684
1685                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1686
1687                 if ( $user->getStubThreshold() ) {
1688                         wfIncrStats( 'pcache_miss_stub' );
1689                 }
1690
1691                 if ( $useParserCache ) {
1692                         $options = $this->mPage->makeParserOptions( $user );
1693                         $parserOutput = ParserCache::singleton()->get( $this, $options );
1694                         if ( $parserOutput !== false ) {
1695                                 wfProfileOut( __METHOD__ );
1696                                 return $parserOutput;
1697                         }
1698                 }
1699
1700                 // Cache miss; parse and output it.
1701                 if ( $oldid === null ) {
1702                         $text = $this->mPage->getRawText();
1703                 } else {
1704                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1705                         if ( $rev === null ) {
1706                                 wfProfileOut( __METHOD__ );
1707                                 return false;
1708                         }
1709                         $text = $rev->getText();
1710                 }
1711
1712                 $output = $this->getOutputFromWikitext( $text, $useParserCache );
1713                 wfProfileOut( __METHOD__ );
1714                 return $output;
1715         }
1716
1717         /**
1718          * This does all the heavy lifting for outputWikitext, except it returns the parser
1719          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1720          * say, embedding thread pages within a discussion system (LiquidThreads)
1721          *
1722          * @param $text string
1723          * @param $cache boolean
1724          * @param $parserOptions parsing options, defaults to false
1725          * @return ParserOutput
1726          */
1727         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1728                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1729
1730                 if ( !$parserOptions ) {
1731                         $parserOptions = $this->getParserOptions();
1732                 }
1733
1734                 $time = - wfTime();
1735                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1736                         $parserOptions, true, true, $this->getRevIdFetched() );
1737                 $time += wfTime();
1738
1739                 # Timing hack
1740                 if ( $time > 3 ) {
1741                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1742                                 $this->getTitle()->getPrefixedDBkey() ) );
1743                 }
1744
1745                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1746                         $parserCache = ParserCache::singleton();
1747                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1748                 }
1749
1750                 // Make sure file cache is not used on uncacheable content.
1751                 // Output that has magic words in it can still use the parser cache
1752                 // (if enabled), though it will generally expire sooner.
1753                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1754                         $wgUseFileCache = false;
1755                 }
1756
1757                 if ( $this->isCurrent() ) {
1758                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1759                 }
1760
1761                 return $this->mParserOutput;
1762         }
1763
1764         /**
1765          * Get parser options suitable for rendering the primary article wikitext
1766          * @return ParserOptions|false
1767          */
1768         public function getParserOptions() {
1769                 global $wgUser;
1770                 if ( !$this->mParserOptions ) {
1771                         $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
1772                 }
1773                 // Clone to allow modifications of the return value without affecting cache
1774                 return clone $this->mParserOptions;
1775         }
1776
1777         /**
1778          * Sets the context this Article is executed in
1779          *
1780          * @param $context IContextSource
1781          * @since 1.18
1782          */
1783         public function setContext( $context ) {
1784                 $this->mContext = $context;
1785         }
1786
1787         /**
1788          * Gets the context this Article is executed in
1789          *
1790          * @return IContextSource
1791          * @since 1.18
1792          */
1793         public function getContext() {
1794                 if ( $this->mContext instanceof IContextSource ) {
1795                         return $this->mContext;
1796                 } else {
1797                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1798                         return RequestContext::getMain();
1799                 }
1800         }
1801
1802         /**
1803          * Removes trackback record for current article from trackbacks table
1804          * @deprecated since 1.18
1805          */
1806         public function deletetrackback() {
1807                 return Action::factory( 'deletetrackback', $this )->show();
1808         }
1809
1810         /**
1811          * Info about this page
1812          * @deprecated since 1.19
1813          */
1814         public function info() {
1815                 Action::factory( 'info', $this )->show();
1816         }
1817
1818         /**
1819          * Mark this particular edit/page as patrolled
1820          * @deprecated since 1.18
1821          */
1822         public function markpatrolled() {
1823                 Action::factory( 'markpatrolled', $this )->show();
1824         }
1825
1826         /**
1827          * Handle action=purge
1828          * @deprecated since 1.19
1829          */
1830         public function purge() {
1831                 return Action::factory( 'purge', $this )->show();
1832         }
1833
1834         /**
1835          * Handle action=revert
1836          * @deprecated since 1.19
1837          */
1838         public function revert() {
1839                 Action::factory( 'revert', $this )->show();
1840         }
1841
1842         /**
1843          * Handle action=rollback
1844          * @deprecated since 1.19
1845          */
1846         public function rollback() {
1847                 Action::factory( 'rollback', $this )->show();
1848         }
1849
1850         /**
1851          * User-interface handler for the "watch" action.
1852          * Requires Request to pass a token as of 1.18.
1853          * @deprecated since 1.18
1854          */
1855         public function watch() {
1856                 Action::factory( 'watch', $this )->show();
1857         }
1858
1859         /**
1860          * Add this page to $wgUser's watchlist
1861          *
1862          * This is safe to be called multiple times
1863          *
1864          * @return bool true on successful watch operation
1865          * @deprecated since 1.18
1866          */
1867         public function doWatch() {
1868                 global $wgUser;
1869                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1870         }
1871
1872         /**
1873          * User interface handler for the "unwatch" action.
1874          * Requires Request to pass a token as of 1.18.
1875          * @deprecated since 1.18
1876          */
1877         public function unwatch() {
1878                 Action::factory( 'unwatch', $this )->show();
1879         }
1880
1881         /**
1882          * Stop watching a page
1883          * @return bool true on successful unwatch
1884          * @deprecated since 1.18
1885          */
1886         public function doUnwatch() {
1887                 global $wgUser;
1888                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1889         }
1890
1891         /**
1892          * Output a redirect back to the article.
1893          * This is typically used after an edit.
1894          *
1895          * @deprecated in 1.18; call $wgOut->redirect() directly
1896          * @param $noRedir Boolean: add redirect=no
1897          * @param $sectionAnchor String: section to redirect to, including "#"
1898          * @param $extraQuery String: extra query params
1899          */
1900         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1901                 wfDeprecated( __METHOD__ );
1902                 global $wgOut;
1903
1904                 if ( $noRedir ) {
1905                         $query = 'redirect=no';
1906                         if ( $extraQuery )
1907                                 $query .= "&$extraQuery";
1908                 } else {
1909                         $query = $extraQuery;
1910                 }
1911
1912                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1913         }
1914
1915         /**
1916          * Use PHP's magic __get handler to handle accessing of
1917          * raw WikiPage fields for backwards compatibility.
1918          *
1919          * @param $fname String Field name
1920          */
1921         public function __get( $fname ) {
1922                 if ( property_exists( $this->mPage, $fname ) ) {
1923                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1924                         return $this->mPage->$fname;
1925                 }
1926                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1927         }
1928
1929         /**
1930          * Use PHP's magic __set handler to handle setting of
1931          * raw WikiPage fields for backwards compatibility.
1932          *
1933          * @param $fname String Field name
1934          * @param $fvalue mixed New value
1935          */
1936         public function __set( $fname, $fvalue ) {
1937                 if ( property_exists( $this->mPage, $fname ) ) {
1938                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1939                         $this->mPage->$fname = $fvalue;
1940                 // Note: extensions may want to toss on new fields
1941                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1942                         $this->mPage->$fname = $fvalue;
1943                 } else {
1944                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1945                 }
1946         }
1947
1948         /**
1949          * Use PHP's magic __call handler to transform instance calls to
1950          * WikiPage functions for backwards compatibility.
1951          *
1952          * @param $fname String Name of called method
1953          * @param $args Array Arguments to the method
1954          */
1955         public function __call( $fname, $args ) {
1956                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1957                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1958                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1959                 }
1960                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1961         }
1962
1963         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1964
1965         /**
1966          * @param $limit array
1967          * @param $reason string
1968          * @param $cascade int
1969          * @param $expiry array
1970          * @return bool
1971          */
1972         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1973                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
1974         }
1975
1976         /**
1977          * @param $reason string
1978          * @param $suppress bool
1979          * @param $id int
1980          * @param $commit bool
1981          * @param $error string
1982          * @return bool
1983          */
1984         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1985                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
1986         }
1987
1988         /**
1989          * @param $fromP
1990          * @param $summary
1991          * @param $token
1992          * @param $bot
1993          * @param $resultDetails
1994          * @param $user User
1995          * @return array
1996          */
1997         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
1998                 global $wgUser;
1999                 $user = is_null( $user ) ? $wgUser : $user;
2000                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2001         }
2002
2003         /**
2004          * @param $fromP
2005          * @param $summary
2006          * @param $bot
2007          * @param $resultDetails
2008          * @param $guser User
2009          * @return array
2010          */
2011         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2012                 global $wgUser;
2013                 $guser = is_null( $guser ) ? $wgUser : $guser;
2014                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2015         }
2016
2017         /**
2018          * @param $hasHistory bool
2019          * @return mixed
2020          */
2021         public function generateReason( &$hasHistory ) {
2022                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2023         }
2024
2025         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2026
2027         /**
2028          * @return array
2029          */
2030         public static function selectFields() {
2031                 return WikiPage::selectFields();
2032         }
2033
2034         /**
2035          * @param $title Title
2036          */
2037         public static function onArticleCreate( $title ) {
2038                 WikiPage::onArticleCreate( $title );
2039         }
2040
2041         /**
2042          * @param $title Title
2043          */
2044         public static function onArticleDelete( $title ) {
2045                 WikiPage::onArticleDelete( $title );
2046         }
2047
2048         /**
2049          * @param $title Title
2050          */
2051         public static function onArticleEdit( $title ) {
2052                 WikiPage::onArticleEdit( $title );
2053         }
2054
2055         /**
2056          * @param $oldtext
2057          * @param $newtext
2058          * @param $flags
2059          * @return string
2060          */
2061         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2062                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2063         }
2064         // ******
2065 }
2066
2067 class PoolWorkArticleView extends PoolCounterWork {
2068
2069         /**
2070          * @var Article
2071          */
2072         private $mArticle;
2073
2074         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2075                 parent::__construct( 'ArticleView', $key );
2076                 $this->mArticle = $article;
2077                 $this->cacheable = $useParserCache;
2078                 $this->parserOptions = $parserOptions;
2079         }
2080
2081         /**
2082          * @return bool
2083          */
2084         function doWork() {
2085                 return $this->mArticle->doViewParse();
2086         }
2087
2088         /**
2089          * @return bool
2090          */
2091         function getCachedWork() {
2092                 global $wgOut;
2093
2094                 $parserCache = ParserCache::singleton();
2095                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2096
2097                 if ( $this->mArticle->mParserOutput !== false ) {
2098                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2099                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2100                         # Ensure that UI elements requiring revision ID have
2101                         # the correct version information.
2102                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2103                         return true;
2104                 }
2105                 return false;
2106         }
2107
2108         /**
2109          * @return bool
2110          */
2111         function fallback() {
2112                 return $this->mArticle->tryDirtyCache();
2113         }
2114
2115         /**
2116          * @param $status Status
2117          */
2118         function error( $status ) {
2119                 global $wgOut;
2120
2121                 $wgOut->clearHTML(); // for release() errors
2122                 $wgOut->enableClientCache( false );
2123                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2124
2125                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2126                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2127
2128                 return false;
2129         }
2130 }