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