includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class for viewing MediaWiki article and history.
   9  *
  10  * This maintains WikiPage functions for backwards compatibility.
  11  *
  12  * @TODO: move and rewrite code to an Action class
  13  *
  14  * See design.txt for an overview.
  15  * Note: edit user interface and cache support functions have been
  16  * moved to separate EditPage and HTMLFileCache classes.
  17  *
  18  * @internal documentation reviewed 15 Mar 2010
  19  */
  20 class Article extends Page {
  21         /**@{{
  22          * @private
  23          */
  24
  25         /**
  26          * @var IContextSource
  27          */
  28         protected $mContext;
  29
  30         /**
  31          * @var WikiPage
  32          */
  33         protected $mPage;
  34
  35         /**
  36          * @var ParserOptions: ParserOptions object for $wgUser articles
  37          */
  38         public $mParserOptions;
  39
  40         var $mContent;                    // !<
  41         var $mContentLoaded = false;      // !<
  42         var $mOldId;                      // !<
  43
  44         /**
  45          * @var Title
  46          */
  47         var $mRedirectedFrom = null;
  48
  49         /**
  50          * @var mixed: boolean false or URL string
  51          */
  52         var $mRedirectUrl = false;        // !<
  53         var $mRevIdFetched = 0;           // !<
  54
  55         /**
  56          * @var Revision
  57          */
  58         var $mRevision = null;
  59
  60         /**
  61          * @var ParserOutput
  62          */
  63         var $mParserOutput;
  64
  65         /**@}}*/
  66
  67         /**
  68          * Constructor and clear the article
  69          * @param $title Title Reference to a Title object.
  70          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  71          */
  72         public function __construct( Title $title, $oldId = null ) {
  73                 $this->mOldId = $oldId;
  74                 $this->mPage = $this->newPage( $title );
  75         }
  76
  77         /**
  78          * @param $title Title
  79          * @return WikiPage
  80          */
  81         protected function newPage( Title $title ) {
  82                 return new WikiPage( $title );
  83         }
  84
  85         /**
  86          * Constructor from a page id
  87          * @param $id Int article ID to load
  88          * @return Article|null
  89          */
  90         public static function newFromID( $id ) {
  91                 $t = Title::newFromID( $id );
  92                 # @todo FIXME: Doesn't inherit right
  93                 return $t == null ? null : new self( $t );
  94                 # return $t == null ? null : new static( $t ); // PHP 5.3
  95         }
  96
  97         /**
  98          * Create an Article object of the appropriate class for the given page.
  99          *
 100          * @param $title Title
 101          * @param $context IContextSource
 102          * @return Article object
 103          */
 104         public static function newFromTitle( $title, IContextSource $context ) {
 105                 if ( NS_MEDIA == $title->getNamespace() ) {
 106                         // FIXME: where should this go?
 107                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 108                 }
 109
 110                 $page = null;
 111                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 112                 if ( !$page ) {
 113                         switch( $title->getNamespace() ) {
 114                                 case NS_FILE:
 115                                         $page = new ImagePage( $title );
 116                                         break;
 117                                 case NS_CATEGORY:
 118                                         $page = new CategoryPage( $title );
 119                                         break;
 120                                 default:
 121                                         $page = new Article( $title );
 122                         }
 123                 }
 124                 $page->setContext( $context );
 125
 126                 return $page;
 127         }
 128
 129         /**
 130          * Tell the page view functions that this view was redirected
 131          * from another page on the wiki.
 132          * @param $from Title object.
 133          */
 134         public function setRedirectedFrom( Title $from ) {
 135                 $this->mRedirectedFrom = $from;
 136         }
 137
 138         /**
 139          * Get the title object of the article
 140          * @return Title object of this page
 141          */
 142         public function getTitle() {
 143                 return $this->mPage->getTitle();
 144         }
 145
 146         /**
 147          * Clear the object
 148          */
 149         public function clear() {
 150                 $this->mContentLoaded = false;
 151
 152                 $this->mRedirectedFrom = null; # Title object if set
 153                 $this->mRevIdFetched = 0;
 154                 $this->mRedirectUrl = false;
 155
 156                 $this->mPage->clear();
 157         }
 158
 159         /**
 160          * Note that getContent/loadContent do not follow redirects anymore.
 161          * If you need to fetch redirectable content easily, try
 162          * the shortcut in Article::followRedirect()
 163          *
 164          * This function has side effects! Do not use this function if you
 165          * only want the real revision text if any.
 166          *
 167          * @return Return the text of this revision
 168          */
 169         public function getContent() {
 170                 global $wgUser;
 171
 172                 wfProfileIn( __METHOD__ );
 173
 174                 if ( $this->mPage->getID() === 0 ) {
 175                         # If this is a MediaWiki:x message, then load the messages
 176                         # and return the message value for x.
 177                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 178                                 $text = $this->getTitle()->getDefaultMessageText();
 179                                 if ( $text === false ) {
 180                                         $text = '';
 181                                 }
 182                         } else {
 183                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 184                         }
 185                         wfProfileOut( __METHOD__ );
 186
 187                         return $text;
 188                 } else {
 189                         $this->fetchContent();
 190                         wfProfileOut( __METHOD__ );
 191
 192                         return $this->mContent;
 193                 }
 194         }
 195
 196         /**
 197          * @return int The oldid of the article that is to be shown, 0 for the
 198          *             current revision
 199          */
 200         public function getOldID() {
 201                 if ( is_null( $this->mOldId ) ) {
 202                         $this->mOldId = $this->getOldIDFromRequest();
 203                 }
 204
 205                 return $this->mOldId;
 206         }
 207
 208         /**
 209          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 210          *
 211          * @return int The old id for the request
 212          */
 213         public function getOldIDFromRequest() {
 214                 global $wgRequest;
 215
 216                 $this->mRedirectUrl = false;
 217
 218                 $oldid = $wgRequest->getIntOrNull( 'oldid' );
 219
 220                 if ( $oldid === null ) {
 221                         return 0;
 222                 }
 223
 224                 if ( $oldid !== 0 ) {
 225                         # Load the given revision and check whether the page is another one.
 226                         # In that case, update this instance to reflect the change.
 227                         $this->mRevision = Revision::newFromId( $oldid );
 228                         if ( $this->mRevision !== null ) {
 229                                 // Revision title doesn't match the page title given?
 230                                 if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 231                                         $function = array( get_class( $this->mPage ), 'newFromID' );
 232                                         $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 233                                 }
 234                         }
 235                 }
 236
 237                 if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 238                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 239                         if ( $nextid ) {
 240                                 $oldid = $nextid;
 241                         } else {
 242                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 243                         }
 244                 } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 245                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 246                         if ( $previd ) {
 247                                 $oldid = $previd;
 248                         }
 249                 }
 250
 251                 return $oldid;
 252         }
 253
 254         /**
 255          * Load the revision (including text) into this object
 256          *
 257          * @deprecated in 1.19; use fetchContent()
 258          */
 259         function loadContent() {
 260                 $this->fetchContent();
 261         }
 262
 263         /**
 264          * Get text of an article from database
 265          * Does *NOT* follow redirects.
 266          *
 267          * @return mixed string containing article contents, or false if null
 268          */
 269         function fetchContent() {
 270                 if ( $this->mContentLoaded ) {
 271                         return $this->mContent;
 272                 }
 273
 274                 wfProfileIn( __METHOD__ );
 275
 276                 $this->mContentLoaded = true;
 277
 278                 $oldid = $this->getOldID();
 279
 280                 # Pre-fill content with error message so that if something
 281                 # fails we'll have something telling us what we intended.
 282                 $t = $this->getTitle()->getPrefixedText();
 283                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 284                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 285
 286                 if ( $oldid ) {
 287                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 288                         if ( !$this->mRevision ) {
 289                                 $this->mRevision = Revision::newFromId( $oldid );
 290                                 if ( !$this->mRevision ) {
 291                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 292                                         wfProfileOut( __METHOD__ );
 293                                         return false;
 294                                 }
 295                         }
 296                 } else {
 297                         if ( !$this->mPage->getLatest() ) {
 298                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 299                                 wfProfileOut( __METHOD__ );
 300                                 return false;
 301                         }
 302
 303                         $this->mRevision = $this->mPage->getRevision();
 304                         if ( !$this->mRevision ) {
 305                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 306                                 wfProfileOut( __METHOD__ );
 307                                 return false;
 308                         }
 309                 }
 310
 311                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 312                 // We should instead work with the Revision object when we need it...
 313                 $this->mContent = $this->mRevision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 314                 $this->mRevIdFetched = $this->mRevision->getId();
 315
 316                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 317
 318                 wfProfileOut( __METHOD__ );
 319
 320                 return $this->mContent;
 321         }
 322
 323         /**
 324          * No-op
 325          * @deprecated since 1.18
 326          */
 327         public function forUpdate() {
 328                 wfDeprecated( __METHOD__ );
 329         }
 330
 331         /**
 332          * Returns true if the currently-referenced revision is the current edit
 333          * to this page (and it exists).
 334          * @return bool
 335          */
 336         public function isCurrent() {
 337                 # If no oldid, this is the current version.
 338                 if ( $this->getOldID() == 0 ) {
 339                         return true;
 340                 }
 341
 342                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 343         }
 344
 345         /**
 346          * Use this to fetch the rev ID used on page views
 347          *
 348          * @return int revision ID of last article revision
 349          */
 350         public function getRevIdFetched() {
 351                 if ( $this->mRevIdFetched ) {
 352                         return $this->mRevIdFetched;
 353                 } else {
 354                         return $this->mPage->getLatest();
 355                 }
 356         }
 357
 358         /**
 359          * This is the default action of the index.php entry point: just view the
 360          * page of the given title.
 361          */
 362         public function view() {
 363                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 364                 global $wgUseFileCache, $wgUseETag;
 365
 366                 wfProfileIn( __METHOD__ );
 367
 368                 # Get variables from query string
 369                 # As side effect this will load the revision and update the title
 370                 # in a revision ID is passed in the request, so this should remain
 371                 # the first call of this method even if $oldid is used way below.
 372                 $oldid = $this->getOldID();
 373
 374                 # Another whitelist check in case getOldID() is altering the title
 375                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $wgUser );
 376                 if ( count( $permErrors ) ) {
 377                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 378                         wfProfileOut( __METHOD__ );
 379                         throw new PermissionsError( 'read', $permErrors );
 380                 }
 381
 382                 # getOldID() may as well want us to redirect somewhere else
 383                 if ( $this->mRedirectUrl ) {
 384                         $wgOut->redirect( $this->mRedirectUrl );
 385                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 386                         wfProfileOut( __METHOD__ );
 387
 388                         return;
 389                 }
 390
 391                 # If we got diff in the query, we want to see a diff page instead of the article.
 392                 if ( $wgRequest->getCheck( 'diff' ) ) {
 393                         wfDebug( __METHOD__ . ": showing diff page\n" );
 394                         $this->showDiffPage();
 395                         wfProfileOut( __METHOD__ );
 396
 397                         return;
 398                 }
 399
 400                 # Set page title (may be overridden by DISPLAYTITLE)
 401                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 402
 403                 $wgOut->setArticleFlag( true );
 404                 # Allow frames by default
 405                 $wgOut->allowClickjacking();
 406
 407                 $parserCache = ParserCache::singleton();
 408
 409                 $parserOptions = $this->getParserOptions();
 410                 # Render printable version, use printable version cache
 411                 if ( $wgOut->isPrintable() ) {
 412                         $parserOptions->setIsPrintable( true );
 413                         $parserOptions->setEditSection( false );
 414                 } elseif ( !$this->getTitle()->quickUserCan( 'edit' ) ) {
 415                         $parserOptions->setEditSection( false );
 416                 }
 417
 418                 # Try client and file cache
 419                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 420                         if ( $wgUseETag ) {
 421                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 422                         }
 423
 424                         # Is it client cached?
 425                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 426                                 wfDebug( __METHOD__ . ": done 304\n" );
 427                                 wfProfileOut( __METHOD__ );
 428
 429                                 return;
 430                         # Try file cache
 431                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 432                                 wfDebug( __METHOD__ . ": done file cache\n" );
 433                                 # tell wgOut that output is taken care of
 434                                 $wgOut->disable();
 435                                 $this->mPage->viewUpdates();
 436                                 wfProfileOut( __METHOD__ );
 437
 438                                 return;
 439                         }
 440                 }
 441
 442                 # Should the parser cache be used?
 443                 $useParserCache = $this->mPage->isParserCacheUsed( $wgUser, $oldid );
 444                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 445                 if ( $wgUser->getStubThreshold() ) {
 446                         wfIncrStats( 'pcache_miss_stub' );
 447                 }
 448
 449                 $this->showRedirectedFromHeader();
 450                 $this->showNamespaceHeader();
 451
 452                 # Iterate through the possible ways of constructing the output text.
 453                 # Keep going until $outputDone is set, or we run out of things to do.
 454                 $pass = 0;
 455                 $outputDone = false;
 456                 $this->mParserOutput = false;
 457
 458                 while ( !$outputDone && ++$pass ) {
 459                         switch( $pass ) {
 460                                 case 1:
 461                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 462                                         break;
 463                                 case 2:
 464                                         # Early abort if the page doesn't exist
 465                                         if ( !$this->mPage->exists() ) {
 466                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 467                                                 $this->showMissingArticle();
 468                                                 wfProfileOut( __METHOD__ );
 469                                                 return;
 470                                         }
 471
 472                                         # Try the parser cache
 473                                         if ( $useParserCache ) {
 474                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 475
 476                                                 if ( $this->mParserOutput !== false ) {
 477                                                         if ( $oldid ) {
 478                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 479                                                                 $this->setOldSubtitle( $oldid );
 480                                                         } else {
 481                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 482                                                         }
 483                                                         $wgOut->addParserOutput( $this->mParserOutput );
 484                                                         # Ensure that UI elements requiring revision ID have
 485                                                         # the correct version information.
 486                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 487                                                         $outputDone = true;
 488                                                         # Preload timestamp to avoid a DB hit
 489                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 490                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 491                                                         }
 492                                                 }
 493                                         }
 494                                         break;
 495                                 case 3:
 496                                         # This will set $this->mRevision if needed
 497                                         $this->fetchContent();
 498
 499                                         # Are we looking at an old revision
 500                                         if ( $oldid && $this->mRevision ) {
 501                                                 $this->setOldSubtitle( $oldid );
 502
 503                                                 if ( !$this->showDeletedRevisionHeader() ) {
 504                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 505                                                         wfProfileOut( __METHOD__ );
 506                                                         return;
 507                                                 }
 508                                         }
 509
 510                                         # Ensure that UI elements requiring revision ID have
 511                                         # the correct version information.
 512                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 513
 514                                         # Pages containing custom CSS or JavaScript get special treatment
 515                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 516                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 517                                                 $this->showCssOrJsPage();
 518                                                 $outputDone = true;
 519                                         } elseif( !wfRunHooks( 'ArticleViewCustom', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 520                                                 # Allow extensions do their own custom view for certain pages
 521                                                 $outputDone = true;
 522                                         } else {
 523                                                 $text = $this->getContent();
 524                                                 $rt = Title::newFromRedirectArray( $text );
 525                                                 if ( $rt ) {
 526                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 527                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 528                                                         $wgOut->addHTML( $this->viewRedirect( $rt ) );
 529                                                         # Parse just to get categories, displaytitle, etc.
 530                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 531                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 532                                                         $outputDone = true;
 533                                                 }
 534                                         }
 535                                         break;
 536                                 case 4:
 537                                         # Run the parse, protected by a pool counter
 538                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 539
 540                                         $key = $parserCache->getKey( $this, $parserOptions );
 541                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 542
 543                                         if ( !$poolArticleView->execute() ) {
 544                                                 # Connection or timeout error
 545                                                 wfProfileOut( __METHOD__ );
 546                                                 return;
 547                                         } else {
 548                                                 $outputDone = true;
 549                                         }
 550                                         break;
 551                                 # Should be unreachable, but just in case...
 552                                 default:
 553                                         break 2;
 554                         }
 555                 }
 556
 557                 # Get the ParserOutput actually *displayed* here.
 558                 # Note that $this->mParserOutput is the *current* version output.
 559                 $pOutput = ( $outputDone instanceof ParserOutput )
 560                         ? $outputDone // object fetched by hook
 561                         : $this->mParserOutput;
 562
 563                 # Adjust title for main page & pages with displaytitle
 564                 if ( $pOutput ) {
 565                         $this->adjustDisplayTitle( $pOutput );
 566                 }
 567
 568                 # For the main page, overwrite the <title> element with the con-
 569                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 570                 # that's not empty).
 571                 # This message always exists because it is in the i18n files
 572                 if ( $this->getTitle()->isMainPage() ) {
 573                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 574                         if ( !$msg->isDisabled() ) {
 575                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 576                         }
 577                 }
 578
 579                 # Check for any __NOINDEX__ tags on the page using $pOutput
 580                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 581                 $wgOut->setIndexPolicy( $policy['index'] );
 582                 $wgOut->setFollowPolicy( $policy['follow'] );
 583
 584                 $this->showViewFooter();
 585                 $this->mPage->viewUpdates();
 586
 587                 wfProfileOut( __METHOD__ );
 588         }
 589
 590         /**
 591          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 592          * @param $pOutput ParserOutput
 593          */
 594         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 595                 global $wgOut;
 596                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 597                 $titleText = $pOutput->getTitleText();
 598                 if ( strval( $titleText ) !== '' ) {
 599                         $wgOut->setPageTitle( $titleText );
 600                 }
 601         }
 602
 603         /**
 604          * Show a diff page according to current request variables. For use within
 605          * Article::view() only, other callers should use the DifferenceEngine class.
 606          */
 607         public function showDiffPage() {
 608                 global $wgRequest, $wgUser;
 609
 610                 $diff = $wgRequest->getVal( 'diff' );
 611                 $rcid = $wgRequest->getVal( 'rcid' );
 612                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 613                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 614                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 615                 $oldid = $this->getOldID();
 616
 617                 $de = new DifferenceEngine( $this->getContext(), $oldid, $diff, $rcid, $purge, $unhide );
 618                 // DifferenceEngine directly fetched the revision:
 619                 $this->mRevIdFetched = $de->mNewid;
 620                 $de->showDiffPage( $diffOnly );
 621
 622                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 623                         # Run view updates for current revision only
 624                         $this->mPage->viewUpdates();
 625                 }
 626         }
 627
 628         /**
 629          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 630          * Article::view() only.
 631          *
 632          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 633          * page views.
 634          */
 635         protected function showCssOrJsPage() {
 636                 global $wgOut;
 637
 638                 $dir = $this->getContext()->getLang()->getDir();
 639                 $lang = $this->getContext()->getLang()->getCode();
 640
 641                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 642                         'clearyourcache' );
 643
 644                 // Give hooks a chance to customise the output
 645                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 646                         // Wrap the whole lot in a <pre> and don't parse
 647                         $m = array();
 648                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 649                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 650                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 651                         $wgOut->addHTML( "\n</pre>\n" );
 652                 }
 653         }
 654
 655         /**
 656          * Get the robot policy to be used for the current view
 657          * @param $action String the action= GET parameter
 658          * @param $pOutput ParserOutput
 659          * @return Array the policy that should be set
 660          * TODO: actions other than 'view'
 661          */
 662         public function getRobotPolicy( $action, $pOutput ) {
 663                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 664                 global $wgDefaultRobotPolicy, $wgRequest;
 665
 666                 $ns = $this->getTitle()->getNamespace();
 667
 668                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 669                         # Don't index user and user talk pages for blocked users (bug 11443)
 670                         if ( !$this->getTitle()->isSubpage() ) {
 671                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 672                                         return array(
 673                                                 'index'  => 'noindex',
 674                                                 'follow' => 'nofollow'
 675                                         );
 676                                 }
 677                         }
 678                 }
 679
 680                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 681                         # Non-articles (special pages etc), and old revisions
 682                         return array(
 683                                 'index'  => 'noindex',
 684                                 'follow' => 'nofollow'
 685                         );
 686                 } elseif ( $wgOut->isPrintable() ) {
 687                         # Discourage indexing of printable versions, but encourage following
 688                         return array(
 689                                 'index'  => 'noindex',
 690                                 'follow' => 'follow'
 691                         );
 692                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 693                         # For ?curid=x urls, disallow indexing
 694                         return array(
 695                                 'index'  => 'noindex',
 696                                 'follow' => 'follow'
 697                         );
 698                 }
 699
 700                 # Otherwise, construct the policy based on the various config variables.
 701                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 702
 703                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 704                         # Honour customised robot policies for this namespace
 705                         $policy = array_merge(
 706                                 $policy,
 707                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 708                         );
 709                 }
 710                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 711                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 712                         # a final sanity check that we have really got the parser output.
 713                         $policy = array_merge(
 714                                 $policy,
 715                                 array( 'index' => $pOutput->getIndexPolicy() )
 716                         );
 717                 }
 718
 719                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 720                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 721                         $policy = array_merge(
 722                                 $policy,
 723                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 724                         );
 725                 }
 726
 727                 return $policy;
 728         }
 729
 730         /**
 731          * Converts a String robot policy into an associative array, to allow
 732          * merging of several policies using array_merge().
 733          * @param $policy Mixed, returns empty array on null/false/'', transparent
 734          *            to already-converted arrays, converts String.
 735          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 736          */
 737         public static function formatRobotPolicy( $policy ) {
 738                 if ( is_array( $policy ) ) {
 739                         return $policy;
 740                 } elseif ( !$policy ) {
 741                         return array();
 742                 }
 743
 744                 $policy = explode( ',', $policy );
 745                 $policy = array_map( 'trim', $policy );
 746
 747                 $arr = array();
 748                 foreach ( $policy as $var ) {
 749                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 750                                 $arr['index'] = $var;
 751                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 752                                 $arr['follow'] = $var;
 753                         }
 754                 }
 755
 756                 return $arr;
 757         }
 758
 759         /**
 760          * If this request is a redirect view, send "redirected from" subtitle to
 761          * $wgOut. Returns true if the header was needed, false if this is not a
 762          * redirect view. Handles both local and remote redirects.
 763          *
 764          * @return boolean
 765          */
 766         public function showRedirectedFromHeader() {
 767                 global $wgOut, $wgRequest, $wgRedirectSources;
 768
 769                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 770
 771                 if ( isset( $this->mRedirectedFrom ) ) {
 772                         // This is an internally redirected page view.
 773                         // We'll need a backlink to the source page for navigation.
 774                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 775                                 $redir = Linker::linkKnown(
 776                                         $this->mRedirectedFrom,
 777                                         null,
 778                                         array(),
 779                                         array( 'redirect' => 'no' )
 780                                 );
 781
 782                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 783
 784                                 // Set the fragment if one was specified in the redirect
 785                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 786                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 787                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 788                                 }
 789
 790                                 // Add a <link rel="canonical"> tag
 791                                 $wgOut->addLink( array( 'rel' => 'canonical',
 792                                         'href' => $this->getTitle()->getLocalURL() )
 793                                 );
 794
 795                                 return true;
 796                         }
 797                 } elseif ( $rdfrom ) {
 798                         // This is an externally redirected view, from some other wiki.
 799                         // If it was reported from a trusted site, supply a backlink.
 800                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 801                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 802                                 $wgOut->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
 803
 804                                 return true;
 805                         }
 806                 }
 807
 808                 return false;
 809         }
 810
 811         /**
 812          * Show a header specific to the namespace currently being viewed, like
 813          * [[MediaWiki:Talkpagetext]]. For Article::view().
 814          */
 815         public function showNamespaceHeader() {
 816                 global $wgOut;
 817
 818                 if ( $this->getTitle()->isTalkPage() ) {
 819                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 820                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 821                         }
 822                 }
 823         }
 824
 825         /**
 826          * Show the footer section of an ordinary page view
 827          */
 828         public function showViewFooter() {
 829                 global $wgOut, $wgUseTrackbacks;
 830
 831                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 832                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 833                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 834                 }
 835
 836                 # If we have been passed an &rcid= parameter, we want to give the user a
 837                 # chance to mark this new article as patrolled.
 838                 $this->showPatrolFooter();
 839
 840                 # Trackbacks
 841                 if ( $wgUseTrackbacks ) {
 842                         $this->addTrackbacks();
 843                 }
 844
 845                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 846
 847         }
 848
 849         /**
 850          * If patrol is possible, output a patrol UI box. This is called from the
 851          * footer section of ordinary page views. If patrol is not possible or not
 852          * desired, does nothing.
 853          */
 854         public function showPatrolFooter() {
 855                 global $wgOut, $wgRequest, $wgUser;
 856
 857                 $rcid = $wgRequest->getVal( 'rcid' );
 858
 859                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 860                         return;
 861                 }
 862
 863                 $token = $wgUser->editToken( $rcid );
 864                 $wgOut->preventClickjacking();
 865
 866                 $wgOut->addHTML(
 867                         "<div class='patrollink'>" .
 868                                 wfMsgHtml(
 869                                         'markaspatrolledlink',
 870                                         Linker::link(
 871                                                 $this->getTitle(),
 872                                                 wfMsgHtml( 'markaspatrolledtext' ),
 873                                                 array(),
 874                                                 array(
 875                                                         'action' => 'markpatrolled',
 876                                                         'rcid' => $rcid,
 877                                                         'token' => $token,
 878                                                 ),
 879                                                 array( 'known', 'noclasses' )
 880                                         )
 881                                 ) .
 882                         '</div>'
 883                 );
 884         }
 885
 886         /**
 887          * Show the error text for a missing article. For articles in the MediaWiki
 888          * namespace, show the default message text. To be called from Article::view().
 889          */
 890         public function showMissingArticle() {
 891                 global $wgOut, $wgRequest, $wgUser;
 892
 893                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 894                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 895                         $parts = explode( '/', $this->getTitle()->getText() );
 896                         $rootPart = $parts[0];
 897                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 898                         $ip = User::isIP( $rootPart );
 899
 900                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 901                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 902                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 903                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 904                                 LogEventsList::showLogExtract(
 905                                         $wgOut,
 906                                         'block',
 907                                         $user->getUserPage()->getPrefixedText(),
 908                                         '',
 909                                         array(
 910                                                 'lim' => 1,
 911                                                 'showIfEmpty' => false,
 912                                                 'msgKey' => array(
 913                                                         'blocked-notice-logextract',
 914                                                         $user->getName() # Support GENDER in notice
 915                                                 )
 916                                         )
 917                                 );
 918                         }
 919                 }
 920
 921                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 922
 923                 # Show delete and move logs
 924                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 925                         array(  'lim' => 10,
 926                                 'conds' => array( "log_action != 'revision'" ),
 927                                 'showIfEmpty' => false,
 928                                 'msgKey' => array( 'moveddeleted-notice' ) )
 929                 );
 930
 931                 # Show error message
 932                 $oldid = $this->getOldID();
 933                 if ( $oldid ) {
 934                         $text = wfMsgNoTrans( 'missing-article',
 935                                 $this->getTitle()->getPrefixedText(),
 936                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 937                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 938                         // Use the default message text
 939                         $text = $this->getTitle()->getDefaultMessageText();
 940                 } else {
 941                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 942                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 943                         $errors = array_merge( $createErrors, $editErrors );
 944
 945                         if ( !count( $errors ) ) {
 946                                 $text = wfMsgNoTrans( 'noarticletext' );
 947                         } else {
 948                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 949                         }
 950                 }
 951                 $text = "<div class='noarticletext'>\n$text\n</div>";
 952
 953                 if ( !$this->mPage->hasViewableContent() ) {
 954                         // If there's no backing content, send a 404 Not Found
 955                         // for better machine handling of broken links.
 956                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 957                 }
 958
 959                 $wgOut->addWikiText( $text );
 960         }
 961
 962         /**
 963          * If the revision requested for view is deleted, check permissions.
 964          * Send either an error message or a warning header to $wgOut.
 965          *
 966          * @return boolean true if the view is allowed, false if not.
 967          */
 968         public function showDeletedRevisionHeader() {
 969                 global $wgOut, $wgRequest;
 970
 971                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 972                         // Not deleted
 973                         return true;
 974                 }
 975
 976                 // If the user is not allowed to see it...
 977                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 978                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 979                                 'rev-deleted-text-permission' );
 980
 981                         return false;
 982                 // If the user needs to confirm that they want to see it...
 983                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 984                         # Give explanation and add a link to view the revision...
 985                         $oldid = intval( $this->getOldID() );
 986                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 987                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 988                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 989                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 990                                 array( $msg, $link ) );
 991
 992                         return false;
 993                 // We are allowed to see...
 994                 } else {
 995                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 996                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
 997                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 998
 999                         return true;
1000                 }
1001         }
1002
1003         /**
1004          * Generate the navigation links when browsing through an article revisions
1005          * It shows the information as:
1006          *   Revision as of \<date\>; view current revision
1007          *   \<- Previous version | Next Version -\>
1008          *
1009          * @param $oldid String: revision ID of this article revision
1010          */
1011         public function setOldSubtitle( $oldid = 0 ) {
1012                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1013
1014                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1015                         return;
1016                 }
1017
1018                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1019
1020                 # Cascade unhide param in links for easy deletion browsing
1021                 $extraParams = array();
1022                 if ( $wgRequest->getVal( 'unhide' ) ) {
1023                         $extraParams['unhide'] = 1;
1024                 }
1025
1026                 $revision = Revision::newFromId( $oldid );
1027                 $timestamp = $revision->getTimestamp();
1028
1029                 $current = ( $oldid == $this->mPage->getLatest() );
1030                 $td = $wgLang->timeanddate( $timestamp, true );
1031                 $tddate = $wgLang->date( $timestamp, true );
1032                 $tdtime = $wgLang->time( $timestamp, true );
1033
1034                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1035                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1036
1037                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1038                         ? 'revision-info-current'
1039                         : 'revision-info';
1040
1041                 $wgOut->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1042                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1043                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1044
1045                 $lnk = $current
1046                         ? wfMsgHtml( 'currentrevisionlink' )
1047                         : Linker::link(
1048                                 $this->getTitle(),
1049                                 wfMsgHtml( 'currentrevisionlink' ),
1050                                 array(),
1051                                 $extraParams,
1052                                 array( 'known', 'noclasses' )
1053                         );
1054                 $curdiff = $current
1055                         ? wfMsgHtml( 'diff' )
1056                         : Linker::link(
1057                                 $this->getTitle(),
1058                                 wfMsgHtml( 'diff' ),
1059                                 array(),
1060                                 array(
1061                                         'diff' => 'cur',
1062                                         'oldid' => $oldid
1063                                 ) + $extraParams,
1064                                 array( 'known', 'noclasses' )
1065                         );
1066                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1067                 $prevlink = $prev
1068                         ? Linker::link(
1069                                 $this->getTitle(),
1070                                 wfMsgHtml( 'previousrevision' ),
1071                                 array(),
1072                                 array(
1073                                         'direction' => 'prev',
1074                                         'oldid' => $oldid
1075                                 ) + $extraParams,
1076                                 array( 'known', 'noclasses' )
1077                         )
1078                         : wfMsgHtml( 'previousrevision' );
1079                 $prevdiff = $prev
1080                         ? Linker::link(
1081                                 $this->getTitle(),
1082                                 wfMsgHtml( 'diff' ),
1083                                 array(),
1084                                 array(
1085                                         'diff' => 'prev',
1086                                         'oldid' => $oldid
1087                                 ) + $extraParams,
1088                                 array( 'known', 'noclasses' )
1089                         )
1090                         : wfMsgHtml( 'diff' );
1091                 $nextlink = $current
1092                         ? wfMsgHtml( 'nextrevision' )
1093                         : Linker::link(
1094                                 $this->getTitle(),
1095                                 wfMsgHtml( 'nextrevision' ),
1096                                 array(),
1097                                 array(
1098                                         'direction' => 'next',
1099                                         'oldid' => $oldid
1100                                 ) + $extraParams,
1101                                 array( 'known', 'noclasses' )
1102                         );
1103                 $nextdiff = $current
1104                         ? wfMsgHtml( 'diff' )
1105                         : Linker::link(
1106                                 $this->getTitle(),
1107                                 wfMsgHtml( 'diff' ),
1108                                 array(),
1109                                 array(
1110                                         'diff' => 'next',
1111                                         'oldid' => $oldid
1112                                 ) + $extraParams,
1113                                 array( 'known', 'noclasses' )
1114                         );
1115
1116                 $cdel = '';
1117
1118                 // User can delete revisions or view deleted revisions...
1119                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1120                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1121                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1122                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1123                         } else {
1124                                 $query = array(
1125                                         'type'   => 'revision',
1126                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1127                                         'ids'    => $oldid
1128                                 );
1129                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1130                         }
1131                         $cdel .= ' ';
1132                 }
1133
1134                 $wgOut->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1135                         wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1136                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>" );
1137         }
1138
1139         /**
1140          * Execute the uncached parse for action=view
1141          * @return bool
1142          */
1143         public function doViewParse() {
1144                 global $wgOut;
1145
1146                 $oldid = $this->getOldID();
1147                 $parserOptions = $this->getParserOptions();
1148
1149                 # Render printable version, use printable version cache
1150                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
1151
1152                 # Don't show section-edit links on old revisions... this way lies madness.
1153                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
1154                         $parserOptions->setEditSection( false );
1155                 }
1156
1157                 $useParserCache = $this->useParserCache( $oldid );
1158                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1159
1160                 return true;
1161         }
1162
1163         /**
1164          * Try to fetch an expired entry from the parser cache. If it is present,
1165          * output it and return true. If it is not present, output nothing and
1166          * return false. This is used as a callback function for
1167          * PoolCounter::executeProtected().
1168          *
1169          * @return boolean
1170          */
1171         public function tryDirtyCache() {
1172                 global $wgOut;
1173                 $parserCache = ParserCache::singleton();
1174                 $options = $this->getParserOptions();
1175
1176                 if ( $wgOut->isPrintable() ) {
1177                         $options->setIsPrintable( true );
1178                         $options->setEditSection( false );
1179                 }
1180
1181                 $output = $parserCache->getDirty( $this, $options );
1182
1183                 if ( $output ) {
1184                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1185                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1186                         $wgOut->setSquidMaxage( 0 );
1187                         $this->mParserOutput = $output;
1188                         $wgOut->addParserOutput( $output );
1189                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1190
1191                         return true;
1192                 } else {
1193                         wfDebugLog( 'dirty', "dirty missing\n" );
1194                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1195
1196                         return false;
1197                 }
1198         }
1199
1200         /**
1201          * View redirect
1202          *
1203          * @param $target Title|Array of destination(s) to redirect
1204          * @param $appendSubtitle Boolean [optional]
1205          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1206          * @return string containing HMTL with redirect link
1207          */
1208         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1209                 global $wgOut, $wgStylePath;
1210
1211                 if ( !is_array( $target ) ) {
1212                         $target = array( $target );
1213                 }
1214
1215                 $lang = $this->getTitle()->getPageLanguage();
1216                 $imageDir = $lang->getDir();
1217
1218                 if ( $appendSubtitle ) {
1219                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1220                 }
1221
1222                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1223
1224                 /**
1225                  * @var $title Title
1226                  */
1227                 $title = array_shift( $target );
1228
1229                 if ( $forceKnown ) {
1230                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1231                 } else {
1232                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1233                 }
1234
1235                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1236                 $alt = $lang->isRTL() ? '←' : '→';
1237                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1238                 foreach ( $target as $rt ) {
1239                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1240                         if ( $forceKnown ) {
1241                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1242                         } else {
1243                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1244                         }
1245                 }
1246
1247                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1248                 return '<div class="redirectMsg">' .
1249                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1250                         '<span class="redirectText">' . $link . '</span></div>';
1251         }
1252
1253         /**
1254          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1255          */
1256         public function addTrackbacks() {
1257                 global $wgOut;
1258
1259                 $dbr = wfGetDB( DB_SLAVE );
1260                 $tbs = $dbr->select( 'trackbacks',
1261                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1262                         array( 'tb_page' => $this->mPage->getID() )
1263                 );
1264
1265                 if ( !$dbr->numRows( $tbs ) ) {
1266                         return;
1267                 }
1268
1269                 $wgOut->preventClickjacking();
1270
1271                 $tbtext = "";
1272                 foreach ( $tbs as $o ) {
1273                         $rmvtxt = "";
1274
1275                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1276                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1277                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1278                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1279                         }
1280
1281                         $tbtext .= "\n";
1282                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1283                                         $o->tb_title,
1284                                         $o->tb_url,
1285                                         $o->tb_ex,
1286                                         $o->tb_name,
1287                                         $rmvtxt );
1288                 }
1289
1290                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1291         }
1292
1293         /**
1294          * Handle action=render
1295          */
1296         public function render() {
1297                 global $wgOut;
1298
1299                 $wgOut->setArticleBodyOnly( true );
1300                 $this->view();
1301         }
1302
1303         /**
1304          * action=protect handler
1305          */
1306         public function protect() {
1307                 $form = new ProtectionForm( $this );
1308                 $form->execute();
1309         }
1310
1311         /**
1312          * action=unprotect handler (alias)
1313          */
1314         public function unprotect() {
1315                 $this->protect();
1316         }
1317
1318         /**
1319          * UI entry point for page deletion
1320          */
1321         public function delete() {
1322                 global $wgOut, $wgRequest, $wgLang;
1323
1324                 # This code desperately needs to be totally rewritten
1325
1326                 $title = $this->getTitle();
1327                 $user = $this->getContext()->getUser();
1328
1329                 # Check permissions
1330                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1331                 if ( count( $permission_errors ) ) {
1332                         throw new PermissionsError( 'delete', $permission_errors );
1333                 }
1334
1335                 # Read-only check...
1336                 if ( wfReadOnly() ) {
1337                         throw new ReadOnlyError;
1338                 }
1339
1340                 # Better double-check that it hasn't been deleted yet!
1341                 $dbw = wfGetDB( DB_MASTER );
1342                 $conds = $title->pageCond();
1343                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1344                 if ( $latest === false ) {
1345                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1346                         $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1347                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1348                                 );
1349                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1350                         LogEventsList::showLogExtract(
1351                                 $wgOut,
1352                                 'delete',
1353                                 $title->getPrefixedText()
1354                         );
1355
1356                         return;
1357                 }
1358
1359                 # Hack for big sites
1360                 $bigHistory = $this->mPage->isBigDeletion();
1361                 if ( $bigHistory && !$title->userCan( 'bigdelete' ) ) {
1362                         global $wgDeleteRevisionsLimit;
1363
1364                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1365                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1366                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1367
1368                         return;
1369                 }
1370
1371                 $deleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1372                 $deleteReason = $wgRequest->getText( 'wpReason' );
1373
1374                 if ( $deleteReasonList == 'other' ) {
1375                         $reason = $deleteReason;
1376                 } elseif ( $deleteReason != '' ) {
1377                         // Entry from drop down menu + additional comment
1378                         $reason = $deleteReasonList . wfMsgForContent( 'colon-separator' ) . $deleteReason;
1379                 } else {
1380                         $reason = $deleteReasonList;
1381                 }
1382
1383                 if ( $wgRequest->wasPosted() && $user->matchEditToken( $wgRequest->getVal( 'wpEditToken' ),
1384                         array( 'delete', $this->getTitle()->getPrefixedText() ) ) )
1385                 {
1386                         # Flag to hide all contents of the archived revisions
1387                         $suppress = $wgRequest->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1388
1389                         $this->doDelete( $reason, $suppress );
1390
1391                         if ( $wgRequest->getCheck( 'wpWatch' ) && $user->isLoggedIn() ) {
1392                                 $this->doWatch();
1393                         } elseif ( $title->userIsWatching() ) {
1394                                 $this->doUnwatch();
1395                         }
1396
1397                         return;
1398                 }
1399
1400                 // Generate deletion reason
1401                 $hasHistory = false;
1402                 if ( !$reason ) {
1403                         $reason = $this->generateReason( $hasHistory );
1404                 }
1405
1406                 // If the page has a history, insert a warning
1407                 if ( $hasHistory ) {
1408                         $revisions = $this->mPage->estimateRevisionCount();
1409                         // @todo FIXME: i18n issue/patchwork message
1410                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1411                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1412                                 wfMsgHtml( 'word-separator' ) . Linker::link( $title,
1413                                         wfMsgHtml( 'history' ),
1414                                         array( 'rel' => 'archives' ),
1415                                         array( 'action' => 'history' ) ) .
1416                                 '</strong>'
1417                         );
1418
1419                         if ( $bigHistory ) {
1420                                 global $wgDeleteRevisionsLimit;
1421                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1422                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1423                         }
1424                 }
1425
1426                 return $this->confirmDelete( $reason );
1427         }
1428
1429         /**
1430          * Output deletion confirmation dialog
1431          * @todo FIXME: Move to another file?
1432          * @param $reason String: prefilled reason
1433          */
1434         public function confirmDelete( $reason ) {
1435                 global $wgOut;
1436
1437                 wfDebug( "Article::confirmDelete\n" );
1438
1439                 $wgOut->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1440                 $wgOut->addBacklinkSubtitle( $this->getTitle() );
1441                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1442                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1443
1444                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1445
1446                 $user = $this->getContext()->getUser();
1447
1448                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1449                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1450                                         <td></td>
1451                                         <td class='mw-input'><strong>" .
1452                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1453                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1454                                         "</strong></td>
1455                                 </tr>";
1456                 } else {
1457                         $suppress = '';
1458                 }
1459                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1460
1461                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1462                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1463                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1464                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1465                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1466                         "<tr id=\"wpDeleteReasonListRow\">
1467                                 <td class='mw-label'>" .
1468                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1469                                 "</td>
1470                                 <td class='mw-input'>" .
1471                                         Xml::listDropDown( 'wpDeleteReasonList',
1472                                                 wfMsgForContent( 'deletereason-dropdown' ),
1473                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1474                                 "</td>
1475                         </tr>
1476                         <tr id=\"wpDeleteReasonRow\">
1477                                 <td class='mw-label'>" .
1478                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1479                                 "</td>
1480                                 <td class='mw-input'>" .
1481                                 Html::input( 'wpReason', $reason, 'text', array(
1482                                         'size' => '60',
1483                                         'maxlength' => '255',
1484                                         'tabindex' => '2',
1485                                         'id' => 'wpReason',
1486                                         'autofocus'
1487                                 ) ) .
1488                                 "</td>
1489                         </tr>";
1490
1491                 # Disallow watching if user is not logged in
1492                 if ( $user->isLoggedIn() ) {
1493                         $form .= "
1494                         <tr>
1495                                 <td></td>
1496                                 <td class='mw-input'>" .
1497                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1498                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1499                                 "</td>
1500                         </tr>";
1501                 }
1502
1503                 $form .= "
1504                         $suppress
1505                         <tr>
1506                                 <td></td>
1507                                 <td class='mw-submit'>" .
1508                                         Xml::submitButton( wfMsg( 'deletepage' ),
1509                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1510                                 "</td>
1511                         </tr>" .
1512                         Xml::closeElement( 'table' ) .
1513                         Xml::closeElement( 'fieldset' ) .
1514                         Html::hidden( 'wpEditToken', $user->editToken( array( 'delete', $this->getTitle()->getPrefixedText() ) ) ) .
1515                         Xml::closeElement( 'form' );
1516
1517                         if ( $user->isAllowed( 'editinterface' ) ) {
1518                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1519                                 $link = Linker::link(
1520                                         $title,
1521                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1522                                         array(),
1523                                         array( 'action' => 'edit' )
1524                                 );
1525                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1526                         }
1527
1528                 $wgOut->addHTML( $form );
1529                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1530                 LogEventsList::showLogExtract( $wgOut, 'delete',
1531                         $this->getTitle()->getPrefixedText()
1532                 );
1533         }
1534
1535         /**
1536          * Perform a deletion and output success or failure messages
1537          * @param $reason
1538          * @param $suppress bool
1539          */
1540         public function doDelete( $reason, $suppress = false ) {
1541                 global $wgOut;
1542
1543                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1544
1545                 $error = '';
1546                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, true, $error ) ) {
1547                         $deleted = $this->getTitle()->getPrefixedText();
1548
1549                         $wgOut->setPageTitle( wfMessage( 'actioncomplete' ) );
1550                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1551
1552                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1553
1554                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1555                         $wgOut->returnToMain( false );
1556                 } else {
1557                         $wgOut->setPageTitle( wfMessage( 'cannotdelete-title', $this->getTitle()->getPrefixedText() ) );
1558                         if ( $error == '' ) {
1559                                 $wgOut->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1560                                         array( 'cannotdelete', wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1561                                 );
1562                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1563
1564                                 LogEventsList::showLogExtract(
1565                                         $wgOut,
1566                                         'delete',
1567                                         $this->getTitle()->getPrefixedText()
1568                                 );
1569                         } else {
1570                                 $wgOut->addHTML( $error );
1571                         }
1572                 }
1573         }
1574
1575         /* Caching functions */
1576
1577         /**
1578          * checkLastModified returns true if it has taken care of all
1579          * output to the client that is necessary for this request.
1580          * (that is, it has sent a cached version of the page)
1581          *
1582          * @return boolean true if cached version send, false otherwise
1583          */
1584         protected function tryFileCache() {
1585                 static $called = false;
1586
1587                 if ( $called ) {
1588                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1589                         return false;
1590                 }
1591
1592                 $called = true;
1593                 if ( $this->isFileCacheable() ) {
1594                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1595                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1596                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1597                                 $cache->loadFromFileCache( $this->getContext() );
1598                                 return true;
1599                         } else {
1600                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1601                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1602                         }
1603                 } else {
1604                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1605                 }
1606
1607                 return false;
1608         }
1609
1610         /**
1611          * Check if the page can be cached
1612          * @return bool
1613          */
1614         public function isFileCacheable() {
1615                 $cacheable = false;
1616
1617                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1618                         $cacheable = $this->mPage->getID()
1619                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1620                         // Extension may have reason to disable file caching on some pages.
1621                         if ( $cacheable ) {
1622                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1623                         }
1624                 }
1625
1626                 return $cacheable;
1627         }
1628
1629         /**#@-*/
1630
1631         /**
1632          * Add the primary page-view wikitext to the output buffer
1633          * Saves the text into the parser cache if possible.
1634          * Updates templatelinks if it is out of date.
1635          *
1636          * @param $text String
1637          * @param $cache Boolean
1638          * @param $parserOptions mixed ParserOptions object, or boolean false
1639          */
1640         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1641                 global $wgOut;
1642
1643                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1644
1645                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1646
1647                 $wgOut->addParserOutput( $this->mParserOutput );
1648         }
1649
1650         /**
1651          * Lightweight method to get the parser output for a page, checking the parser cache
1652          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1653          * consider, so it's not appropriate to use there.
1654          *
1655          * @since 1.16 (r52326) for LiquidThreads
1656          *
1657          * @param $oldid mixed integer Revision ID or null
1658          * @param $user User The relevant user
1659          * @return ParserOutput or false if the given revsion ID is not found
1660          */
1661         public function getParserOutput( $oldid = null, User $user = null ) {
1662                 global $wgEnableParserCache, $wgUser;
1663                 $user = is_null( $user ) ? $wgUser : $user;
1664
1665                 wfProfileIn( __METHOD__ );
1666                 // Should the parser cache be used?
1667                 $useParserCache = $wgEnableParserCache &&
1668                         $user->getStubThreshold() == 0 &&
1669                         $this->mPage->exists() &&
1670                         $oldid === null;
1671
1672                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1673
1674                 if ( $user->getStubThreshold() ) {
1675                         wfIncrStats( 'pcache_miss_stub' );
1676                 }
1677
1678                 if ( $useParserCache ) {
1679                         $options = $this->mPage->makeParserOptions( $user );
1680                         $parserOutput = ParserCache::singleton()->get( $this, $options );
1681                         if ( $parserOutput !== false ) {
1682                                 wfProfileOut( __METHOD__ );
1683                                 return $parserOutput;
1684                         }
1685                 }
1686
1687                 // Cache miss; parse and output it.
1688                 if ( $oldid === null ) {
1689                         $text = $this->mPage->getRawText();
1690                 } else {
1691                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1692                         if ( $rev === null ) {
1693                                 wfProfileOut( __METHOD__ );
1694                                 return false;
1695                         }
1696                         $text = $rev->getText();
1697                 }
1698
1699                 $output = $this->getOutputFromWikitext( $text, $useParserCache );
1700                 wfProfileOut( __METHOD__ );
1701                 return $output;
1702         }
1703
1704         /**
1705          * This does all the heavy lifting for outputWikitext, except it returns the parser
1706          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1707          * say, embedding thread pages within a discussion system (LiquidThreads)
1708          *
1709          * @param $text string
1710          * @param $cache boolean
1711          * @param $parserOptions parsing options, defaults to false
1712          * @return ParserOutput
1713          */
1714         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1715                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1716
1717                 if ( !$parserOptions ) {
1718                         $parserOptions = $this->getParserOptions();
1719                 }
1720
1721                 $time = - wfTime();
1722                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1723                         $parserOptions, true, true, $this->getRevIdFetched() );
1724                 $time += wfTime();
1725
1726                 # Timing hack
1727                 if ( $time > 3 ) {
1728                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1729                                 $this->getTitle()->getPrefixedDBkey() ) );
1730                 }
1731
1732                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1733                         $parserCache = ParserCache::singleton();
1734                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1735                 }
1736
1737                 // Make sure file cache is not used on uncacheable content.
1738                 // Output that has magic words in it can still use the parser cache
1739                 // (if enabled), though it will generally expire sooner.
1740                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1741                         $wgUseFileCache = false;
1742                 }
1743
1744                 if ( $this->isCurrent() ) {
1745                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1746                 }
1747
1748                 return $this->mParserOutput;
1749         }
1750
1751         /**
1752          * Get parser options suitable for rendering the primary article wikitext
1753          * @return ParserOptions|false
1754          */
1755         public function getParserOptions() {
1756                 global $wgUser;
1757                 if ( !$this->mParserOptions ) {
1758                         $this->mParserOptions = $this->mPage->makeParserOptions( $wgUser );
1759                 }
1760                 // Clone to allow modifications of the return value without affecting cache
1761                 return clone $this->mParserOptions;
1762         }
1763
1764         /**
1765          * Sets the context this Article is executed in
1766          *
1767          * @param $context IContextSource
1768          * @since 1.18
1769          */
1770         public function setContext( $context ) {
1771                 $this->mContext = $context;
1772         }
1773
1774         /**
1775          * Gets the context this Article is executed in
1776          *
1777          * @return IContextSource
1778          * @since 1.18
1779          */
1780         public function getContext() {
1781                 if ( $this->mContext instanceof IContextSource ) {
1782                         return $this->mContext;
1783                 } else {
1784                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1785                         return RequestContext::getMain();
1786                 }
1787         }
1788
1789         /**
1790          * Removes trackback record for current article from trackbacks table
1791          * @deprecated since 1.18
1792          */
1793         public function deletetrackback() {
1794                 return Action::factory( 'deletetrackback', $this )->show();
1795         }
1796
1797         /**
1798          * Info about this page
1799          * @deprecated since 1.19
1800          */
1801         public function info() {
1802                 Action::factory( 'info', $this )->show();
1803         }
1804
1805         /**
1806          * Mark this particular edit/page as patrolled
1807          * @deprecated since 1.18
1808          */
1809         public function markpatrolled() {
1810                 Action::factory( 'markpatrolled', $this )->show();
1811         }
1812
1813         /**
1814          * Handle action=purge
1815          * @deprecated since 1.19
1816          */
1817         public function purge() {
1818                 return Action::factory( 'purge', $this )->show();
1819         }
1820
1821         /**
1822          * Handle action=revert
1823          * @deprecated since 1.19
1824          */
1825         public function revert() {
1826                 Action::factory( 'revert', $this )->show();
1827         }
1828
1829         /**
1830          * Handle action=rollback
1831          * @deprecated since 1.19
1832          */
1833         public function rollback() {
1834                 Action::factory( 'rollback', $this )->show();
1835         }
1836
1837         /**
1838          * User-interface handler for the "watch" action.
1839          * Requires Request to pass a token as of 1.18.
1840          * @deprecated since 1.18
1841          */
1842         public function watch() {
1843                 Action::factory( 'watch', $this )->show();
1844         }
1845
1846         /**
1847          * Add this page to $wgUser's watchlist
1848          *
1849          * This is safe to be called multiple times
1850          *
1851          * @return bool true on successful watch operation
1852          * @deprecated since 1.18
1853          */
1854         public function doWatch() {
1855                 global $wgUser;
1856                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1857         }
1858
1859         /**
1860          * User interface handler for the "unwatch" action.
1861          * Requires Request to pass a token as of 1.18.
1862          * @deprecated since 1.18
1863          */
1864         public function unwatch() {
1865                 Action::factory( 'unwatch', $this )->show();
1866         }
1867
1868         /**
1869          * Stop watching a page
1870          * @return bool true on successful unwatch
1871          * @deprecated since 1.18
1872          */
1873         public function doUnwatch() {
1874                 global $wgUser;
1875                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1876         }
1877
1878         /**
1879          * Output a redirect back to the article.
1880          * This is typically used after an edit.
1881          *
1882          * @deprecated in 1.18; call $wgOut->redirect() directly
1883          * @param $noRedir Boolean: add redirect=no
1884          * @param $sectionAnchor String: section to redirect to, including "#"
1885          * @param $extraQuery String: extra query params
1886          */
1887         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1888                 wfDeprecated( __METHOD__ );
1889                 global $wgOut;
1890
1891                 if ( $noRedir ) {
1892                         $query = 'redirect=no';
1893                         if ( $extraQuery )
1894                                 $query .= "&$extraQuery";
1895                 } else {
1896                         $query = $extraQuery;
1897                 }
1898
1899                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1900         }
1901
1902         /**
1903          * Use PHP's magic __get handler to handle accessing of
1904          * raw WikiPage fields for backwards compatibility.
1905          *
1906          * @param $fname String Field name
1907          */
1908         public function __get( $fname ) {
1909                 if ( property_exists( $this->mPage, $fname ) ) {
1910                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1911                         return $this->mPage->$fname;
1912                 }
1913                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1914         }
1915
1916         /**
1917          * Use PHP's magic __set handler to handle setting of
1918          * raw WikiPage fields for backwards compatibility.
1919          *
1920          * @param $fname String Field name
1921          * @param $fvalue mixed New value
1922          */
1923         public function __set( $fname, $fvalue ) {
1924                 if ( property_exists( $this->mPage, $fname ) ) {
1925                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1926                         $this->mPage->$fname = $fvalue;
1927                 // Note: extensions may want to toss on new fields
1928                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1929                         $this->mPage->$fname = $fvalue;
1930                 } else {
1931                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
1932                 }
1933         }
1934
1935         /**
1936          * Use PHP's magic __call handler to transform instance calls to
1937          * WikiPage functions for backwards compatibility.
1938          *
1939          * @param $fname String Name of called method
1940          * @param $args Array Arguments to the method
1941          */
1942         public function __call( $fname, $args ) {
1943                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
1944                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
1945                         return call_user_func_array( array( $this->mPage, $fname ), $args );
1946                 }
1947                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
1948         }
1949
1950         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
1951
1952         /**
1953          * @param $limit array
1954          * @param $reason string
1955          * @param $cascade int
1956          * @param $expiry array
1957          * @return bool
1958          */
1959         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
1960                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
1961         }
1962
1963         /**
1964          * @param $reason string
1965          * @param $suppress bool
1966          * @param $id int
1967          * @param $commit bool
1968          * @param $error string
1969          * @return bool
1970          */
1971         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
1972                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
1973         }
1974
1975         /**
1976          * @param $fromP
1977          * @param $summary
1978          * @param $token
1979          * @param $bot
1980          * @param $resultDetails
1981          * @param $user User
1982          * @return array
1983          */
1984         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
1985                 global $wgUser;
1986                 $user = is_null( $user ) ? $wgUser : $user;
1987                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
1988         }
1989
1990         /**
1991          * @param $fromP
1992          * @param $summary
1993          * @param $bot
1994          * @param $resultDetails
1995          * @param $guser User
1996          * @return array
1997          */
1998         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
1999                 global $wgUser;
2000                 $guser = is_null( $guser ) ? $wgUser : $guser;
2001                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2002         }
2003
2004         /**
2005          * @param $hasHistory bool
2006          * @return mixed
2007          */
2008         public function generateReason( &$hasHistory ) {
2009                 return $this->mPage->getAutoDeleteReason( $hasHistory );
2010         }
2011
2012         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2013
2014         /**
2015          * @return array
2016          */
2017         public static function selectFields() {
2018                 return WikiPage::selectFields();
2019         }
2020
2021         /**
2022          * @param $title Title
2023          */
2024         public static function onArticleCreate( $title ) {
2025                 WikiPage::onArticleCreate( $title );
2026         }
2027
2028         /**
2029          * @param $title Title
2030          */
2031         public static function onArticleDelete( $title ) {
2032                 WikiPage::onArticleDelete( $title );
2033         }
2034
2035         /**
2036          * @param $title Title
2037          */
2038         public static function onArticleEdit( $title ) {
2039                 WikiPage::onArticleEdit( $title );
2040         }
2041
2042         /**
2043          * @param $oldtext
2044          * @param $newtext
2045          * @param $flags
2046          * @return string
2047          */
2048         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2049                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2050         }
2051         // ******
2052 }
2053
2054 class PoolWorkArticleView extends PoolCounterWork {
2055
2056         /**
2057          * @var Article
2058          */
2059         private $mArticle;
2060
2061         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2062                 parent::__construct( 'ArticleView', $key );
2063                 $this->mArticle = $article;
2064                 $this->cacheable = $useParserCache;
2065                 $this->parserOptions = $parserOptions;
2066         }
2067
2068         /**
2069          * @return bool
2070          */
2071         function doWork() {
2072                 return $this->mArticle->doViewParse();
2073         }
2074
2075         /**
2076          * @return bool
2077          */
2078         function getCachedWork() {
2079                 global $wgOut;
2080
2081                 $parserCache = ParserCache::singleton();
2082                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2083
2084                 if ( $this->mArticle->mParserOutput !== false ) {
2085                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2086                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2087                         # Ensure that UI elements requiring revision ID have
2088                         # the correct version information.
2089                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2090                         return true;
2091                 }
2092                 return false;
2093         }
2094
2095         /**
2096          * @return bool
2097          */
2098         function fallback() {
2099                 return $this->mArticle->tryDirtyCache();
2100         }
2101
2102         /**
2103          * @param $status Status
2104          */
2105         function error( $status ) {
2106                 global $wgOut;
2107
2108                 $wgOut->clearHTML(); // for release() errors
2109                 $wgOut->enableClientCache( false );
2110                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2111
2112                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2113                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2114
2115                 return false;
2116         }
2117 }