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