includes/Article.php

   1 <?php
   2 /**
   3  * User interface for page actions.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Class for viewing MediaWiki article and history.
  25  *
  26  * This maintains WikiPage functions for backwards compatibility.
  27  *
  28  * @todo Move and rewrite code to an Action class
  29  *
  30  * See design.txt for an overview.
  31  * Note: edit user interface and cache support functions have been
  32  * moved to separate EditPage and HTMLFileCache classes.
  33  *
  34  * @internal documentation reviewed 15 Mar 2010
  35  */
  36 class Article implements Page {
  37         /**@{{
  38          * @private
  39          */
  40
  41         /**
  42          * The context this Article is executed in
  43          * @var IContextSource $mContext
  44          */
  45         protected $mContext;
  46
  47         /**
  48          * The WikiPage object of this instance
  49          * @var WikiPage $mPage
  50          */
  51         protected $mPage;
  52
  53         /**
  54          * ParserOptions object for $wgUser articles
  55          * @var ParserOptions $mParserOptions
  56          */
  57         public $mParserOptions;
  58
  59         /**
  60          * Text of the revision we are working on
  61          * @var string $mContent
  62          */
  63         var $mContent;                    // !< #BC cruft
  64
  65         /**
  66          * Content of the revision we are working on
  67          * @var Content
  68          * @since 1.21
  69          */
  70         var $mContentObject;              // !<
  71
  72         /**
  73          * Is the content ($mContent) already loaded?
  74          * @var bool $mContentLoaded
  75          */
  76         var $mContentLoaded = false;      // !<
  77
  78         /**
  79          * The oldid of the article that is to be shown, 0 for the
  80          * current revision
  81          * @var int|null $mOldId
  82          */
  83         var $mOldId;                      // !<
  84
  85         /**
  86          * Title from which we were redirected here
  87          * @var Title $mRedirectedFrom
  88          */
  89         var $mRedirectedFrom = null;
  90
  91         /**
  92          * URL to redirect to or false if none
  93          * @var string|bool $mRedirectUrl
  94          */
  95         var $mRedirectUrl = false;        // !<
  96
  97         /**
  98          * Revision ID of revision we are working on
  99          * @var int $mRevIdFetched
 100          */
 101         var $mRevIdFetched = 0;           // !<
 102
 103         /**
 104          * Revision we are working on
 105          * @var Revision $mRevision
 106          */
 107         var $mRevision = null;
 108
 109         /**
 110          * ParserOutput object
 111          * @var ParserOutput $mParserOutput
 112          */
 113         var $mParserOutput;
 114
 115         /**@}}*/
 116
 117         /**
 118          * Constructor and clear the article
 119          * @param Title $title Reference to a Title object.
 120          * @param int $oldId Revision ID, null to fetch from request, zero for current
 121          */
 122         public function __construct( Title $title, $oldId = null ) {
 123                 $this->mOldId = $oldId;
 124                 $this->mPage = $this->newPage( $title );
 125         }
 126
 127         /**
 128          * @param Title $title
 129          * @return WikiPage
 130          */
 131         protected function newPage( Title $title ) {
 132                 return new WikiPage( $title );
 133         }
 134
 135         /**
 136          * Constructor from a page id
 137          * @param int $id Article ID to load
 138          * @return Article|null
 139          */
 140         public static function newFromID( $id ) {
 141                 $t = Title::newFromID( $id );
 142                 # @todo FIXME: Doesn't inherit right
 143                 return $t == null ? null : new self( $t );
 144                 # return $t == null ? null : new static( $t ); // PHP 5.3
 145         }
 146
 147         /**
 148          * Create an Article object of the appropriate class for the given page.
 149          *
 150          * @param Title $title
 151          * @param IContextSource $context
 152          * @return Article
 153          */
 154         public static function newFromTitle( $title, IContextSource $context ) {
 155                 if ( NS_MEDIA == $title->getNamespace() ) {
 156                         // FIXME: where should this go?
 157                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
 158                 }
 159
 160                 $page = null;
 161                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page, $context ) );
 162                 if ( !$page ) {
 163                         switch ( $title->getNamespace() ) {
 164                                 case NS_FILE:
 165                                         $page = new ImagePage( $title );
 166                                         break;
 167                                 case NS_CATEGORY:
 168                                         $page = new CategoryPage( $title );
 169                                         break;
 170                                 default:
 171                                         $page = new Article( $title );
 172                         }
 173                 }
 174                 $page->setContext( $context );
 175
 176                 return $page;
 177         }
 178
 179         /**
 180          * Create an Article object of the appropriate class for the given page.
 181          *
 182          * @param WikiPage $page
 183          * @param IContextSource $context
 184          * @return Article
 185          */
 186         public static function newFromWikiPage( WikiPage $page, IContextSource $context ) {
 187                 $article = self::newFromTitle( $page->getTitle(), $context );
 188                 $article->mPage = $page; // override to keep process cached vars
 189                 return $article;
 190         }
 191
 192         /**
 193          * Tell the page view functions that this view was redirected
 194          * from another page on the wiki.
 195          * @param Title $from
 196          */
 197         public function setRedirectedFrom( Title $from ) {
 198                 $this->mRedirectedFrom = $from;
 199         }
 200
 201         /**
 202          * Get the title object of the article
 203          *
 204          * @return Title Title object of this page
 205          */
 206         public function getTitle() {
 207                 return $this->mPage->getTitle();
 208         }
 209
 210         /**
 211          * Get the WikiPage object of this instance
 212          *
 213          * @since 1.19
 214          * @return WikiPage
 215          */
 216         public function getPage() {
 217                 return $this->mPage;
 218         }
 219
 220         /**
 221          * Clear the object
 222          */
 223         public function clear() {
 224                 $this->mContentLoaded = false;
 225
 226                 $this->mRedirectedFrom = null; # Title object if set
 227                 $this->mRevIdFetched = 0;
 228                 $this->mRedirectUrl = false;
 229
 230                 $this->mPage->clear();
 231         }
 232
 233         /**
 234          * Note that getContent/loadContent do not follow redirects anymore.
 235          * If you need to fetch redirectable content easily, try
 236          * the shortcut in WikiPage::getRedirectTarget()
 237          *
 238          * This function has side effects! Do not use this function if you
 239          * only want the real revision text if any.
 240          *
 241          * @deprecated since 1.21; use WikiPage::getContent() instead
 242          *
 243          * @return string Return the text of this revision
 244          */
 245         public function getContent() {
 246                 ContentHandler::deprecated( __METHOD__, '1.21' );
 247                 $content = $this->getContentObject();
 248                 return ContentHandler::getContentText( $content );
 249         }
 250
 251         /**
 252          * Returns a Content object representing the pages effective display content,
 253          * not necessarily the revision's content!
 254          *
 255          * Note that getContent/loadContent do not follow redirects anymore.
 256          * If you need to fetch redirectable content easily, try
 257          * the shortcut in WikiPage::getRedirectTarget()
 258          *
 259          * This function has side effects! Do not use this function if you
 260          * only want the real revision text if any.
 261          *
 262          * @return Content Return the content of this revision
 263          *
 264          * @since 1.21
 265          */
 266         protected function getContentObject() {
 267                 wfProfileIn( __METHOD__ );
 268
 269                 if ( $this->mPage->getID() === 0 ) {
 270                         # If this is a MediaWiki:x message, then load the messages
 271                         # and return the message value for x.
 272                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 273                                 $text = $this->getTitle()->getDefaultMessageText();
 274                                 if ( $text === false ) {
 275                                         $text = '';
 276                                 }
 277
 278                                 $content = ContentHandler::makeContent( $text, $this->getTitle() );
 279                         } else {
 280                                 $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
 281                                 $content = new MessageContent( $message, null, 'parsemag' );
 282                         }
 283                 } else {
 284                         $this->fetchContentObject();
 285                         $content = $this->mContentObject;
 286                 }
 287
 288                 wfProfileOut( __METHOD__ );
 289                 return $content;
 290         }
 291
 292         /**
 293          * @return int The oldid of the article that is to be shown, 0 for the current revision
 294          */
 295         public function getOldID() {
 296                 if ( is_null( $this->mOldId ) ) {
 297                         $this->mOldId = $this->getOldIDFromRequest();
 298                 }
 299
 300                 return $this->mOldId;
 301         }
 302
 303         /**
 304          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 305          *
 306          * @return int The old id for the request
 307          */
 308         public function getOldIDFromRequest() {
 309                 $this->mRedirectUrl = false;
 310
 311                 $request = $this->getContext()->getRequest();
 312                 $oldid = $request->getIntOrNull( 'oldid' );
 313
 314                 if ( $oldid === null ) {
 315                         return 0;
 316                 }
 317
 318                 if ( $oldid !== 0 ) {
 319                         # Load the given revision and check whether the page is another one.
 320                         # In that case, update this instance to reflect the change.
 321                         if ( $oldid === $this->mPage->getLatest() ) {
 322                                 $this->mRevision = $this->mPage->getRevision();
 323                         } else {
 324                                 $this->mRevision = Revision::newFromId( $oldid );
 325                                 if ( $this->mRevision !== null ) {
 326                                         // Revision title doesn't match the page title given?
 327                                         if ( $this->mPage->getID() != $this->mRevision->getPage() ) {
 328                                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 329                                                 $this->mPage = call_user_func( $function, $this->mRevision->getPage() );
 330                                         }
 331                                 }
 332                         }
 333                 }
 334
 335                 if ( $request->getVal( 'direction' ) == 'next' ) {
 336                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 337                         if ( $nextid ) {
 338                                 $oldid = $nextid;
 339                                 $this->mRevision = null;
 340                         } else {
 341                                 $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 342                         }
 343                 } elseif ( $request->getVal( 'direction' ) == 'prev' ) {
 344                         $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 345                         if ( $previd ) {
 346                                 $oldid = $previd;
 347                                 $this->mRevision = null;
 348                         }
 349                 }
 350
 351                 return $oldid;
 352         }
 353
 354         /**
 355          * Load the revision (including text) into this object
 356          *
 357          * @deprecated since 1.19; use fetchContent()
 358          */
 359         function loadContent() {
 360                 wfDeprecated( __METHOD__, '1.19' );
 361                 $this->fetchContent();
 362         }
 363
 364         /**
 365          * Get text of an article from database
 366          * Does *NOT* follow redirects.
 367          *
 368          * @protected
 369          * @note This is really internal functionality that should really NOT be
 370          * used by other functions. For accessing article content, use the WikiPage
 371          * class, especially WikiBase::getContent(). However, a lot of legacy code
 372          * uses this method to retrieve page text from the database, so the function
 373          * has to remain public for now.
 374          *
 375          * @return string|bool String containing article contents, or false if null
 376          * @deprecated since 1.21, use WikiPage::getContent() instead
 377          */
 378         function fetchContent() { #BC cruft!
 379                 ContentHandler::deprecated( __METHOD__, '1.21' );
 380
 381                 if ( $this->mContentLoaded && $this->mContent ) {
 382                         return $this->mContent;
 383                 }
 384
 385                 wfProfileIn( __METHOD__ );
 386
 387                 $content = $this->fetchContentObject();
 388
 389                 if ( !$content ) {
 390                         wfProfileOut( __METHOD__ );
 391                         return false;
 392                 }
 393
 394                 // @todo Get rid of mContent everywhere!
 395                 $this->mContent = ContentHandler::getContentText( $content );
 396                 ContentHandler::runLegacyHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 397
 398                 wfProfileOut( __METHOD__ );
 399
 400                 return $this->mContent;
 401         }
 402
 403         /**
 404          * Get text content object
 405          * Does *NOT* follow redirects.
 406          * @todo When is this null?
 407          *
 408          * @note Code that wants to retrieve page content from the database should
 409          * use WikiPage::getContent().
 410          *
 411          * @return Content|null|bool
 412          *
 413          * @since 1.21
 414          */
 415         protected function fetchContentObject() {
 416                 if ( $this->mContentLoaded ) {
 417                         return $this->mContentObject;
 418                 }
 419
 420                 wfProfileIn( __METHOD__ );
 421
 422                 $this->mContentLoaded = true;
 423                 $this->mContent = null;
 424
 425                 $oldid = $this->getOldID();
 426
 427                 # Pre-fill content with error message so that if something
 428                 # fails we'll have something telling us what we intended.
 429                 //XXX: this isn't page content but a UI message. horrible.
 430                 $this->mContentObject = new MessageContent( 'missing-revision', array( $oldid ), array() );
 431
 432                 if ( $oldid ) {
 433                         # $this->mRevision might already be fetched by getOldIDFromRequest()
 434                         if ( !$this->mRevision ) {
 435                                 $this->mRevision = Revision::newFromId( $oldid );
 436                                 if ( !$this->mRevision ) {
 437                                         wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 438                                         wfProfileOut( __METHOD__ );
 439                                         return false;
 440                                 }
 441                         }
 442                 } else {
 443                         if ( !$this->mPage->getLatest() ) {
 444                                 wfDebug( __METHOD__ . " failed to find page data for title " .
 445                                         $this->getTitle()->getPrefixedText() . "\n" );
 446                                 wfProfileOut( __METHOD__ );
 447                                 return false;
 448                         }
 449
 450                         $this->mRevision = $this->mPage->getRevision();
 451
 452                         if ( !$this->mRevision ) {
 453                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " .
 454                                         $this->mPage->getLatest() . "\n" );
 455                                 wfProfileOut( __METHOD__ );
 456                                 return false;
 457                         }
 458                 }
 459
 460                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 461                 // We should instead work with the Revision object when we need it...
 462                 // Loads if user is allowed
 463                 $this->mContentObject = $this->mRevision->getContent(
 464                         Revision::FOR_THIS_USER,
 465                         $this->getContext()->getUser()
 466                 );
 467                 $this->mRevIdFetched = $this->mRevision->getId();
 468
 469                 wfRunHooks( 'ArticleAfterFetchContentObject', array( &$this, &$this->mContentObject ) );
 470
 471                 wfProfileOut( __METHOD__ );
 472
 473                 return $this->mContentObject;
 474         }
 475
 476         /**
 477          * Returns true if the currently-referenced revision is the current edit
 478          * to this page (and it exists).
 479          * @return bool
 480          */
 481         public function isCurrent() {
 482                 # If no oldid, this is the current version.
 483                 if ( $this->getOldID() == 0 ) {
 484                         return true;
 485                 }
 486
 487                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 488         }
 489
 490         /**
 491          * Get the fetched Revision object depending on request parameters or null
 492          * on failure.
 493          *
 494          * @since 1.19
 495          * @return Revision|null
 496          */
 497         public function getRevisionFetched() {
 498                 $this->fetchContentObject();
 499
 500                 return $this->mRevision;
 501         }
 502
 503         /**
 504          * Use this to fetch the rev ID used on page views
 505          *
 506          * @return int Revision ID of last article revision
 507          */
 508         public function getRevIdFetched() {
 509                 if ( $this->mRevIdFetched ) {
 510                         return $this->mRevIdFetched;
 511                 } else {
 512                         return $this->mPage->getLatest();
 513                 }
 514         }
 515
 516         /**
 517          * This is the default action of the index.php entry point: just view the
 518          * page of the given title.
 519          */
 520         public function view() {
 521                 global $wgUseFileCache, $wgUseETag, $wgDebugToolbar;
 522
 523                 wfProfileIn( __METHOD__ );
 524
 525                 # Get variables from query string
 526                 # As side effect this will load the revision and update the title
 527                 # in a revision ID is passed in the request, so this should remain
 528                 # the first call of this method even if $oldid is used way below.
 529                 $oldid = $this->getOldID();
 530
 531                 $user = $this->getContext()->getUser();
 532                 # Another whitelist check in case getOldID() is altering the title
 533                 $permErrors = $this->getTitle()->getUserPermissionsErrors( 'read', $user );
 534                 if ( count( $permErrors ) ) {
 535                         wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 536                         wfProfileOut( __METHOD__ );
 537                         throw new PermissionsError( 'read', $permErrors );
 538                 }
 539
 540                 $outputPage = $this->getContext()->getOutput();
 541                 # getOldID() may as well want us to redirect somewhere else
 542                 if ( $this->mRedirectUrl ) {
 543                         $outputPage->redirect( $this->mRedirectUrl );
 544                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 545                         wfProfileOut( __METHOD__ );
 546
 547                         return;
 548                 }
 549
 550                 # If we got diff in the query, we want to see a diff page instead of the article.
 551                 if ( $this->getContext()->getRequest()->getCheck( 'diff' ) ) {
 552                         wfDebug( __METHOD__ . ": showing diff page\n" );
 553                         $this->showDiffPage();
 554                         wfProfileOut( __METHOD__ );
 555
 556                         return;
 557                 }
 558
 559                 # Set page title (may be overridden by DISPLAYTITLE)
 560                 $outputPage->setPageTitle( $this->getTitle()->getPrefixedText() );
 561
 562                 $outputPage->setArticleFlag( true );
 563                 # Allow frames by default
 564                 $outputPage->allowClickjacking();
 565
 566                 $parserCache = ParserCache::singleton();
 567
 568                 $parserOptions = $this->getParserOptions();
 569                 # Render printable version, use printable version cache
 570                 if ( $outputPage->isPrintable() ) {
 571                         $parserOptions->setIsPrintable( true );
 572                         $parserOptions->setEditSection( false );
 573                 } elseif ( !$this->isCurrent() || !$this->getTitle()->quickUserCan( 'edit', $user ) ) {
 574                         $parserOptions->setEditSection( false );
 575                 }
 576
 577                 # Try client and file cache
 578                 if ( !$wgDebugToolbar && $oldid === 0 && $this->mPage->checkTouched() ) {
 579                         if ( $wgUseETag ) {
 580                                 $outputPage->setETag( $parserCache->getETag( $this, $parserOptions ) );
 581                         }
 582
 583                         # Is it client cached?
 584                         if ( $outputPage->checkLastModified( $this->mPage->getTouched() ) ) {
 585                                 wfDebug( __METHOD__ . ": done 304\n" );
 586                                 wfProfileOut( __METHOD__ );
 587
 588                                 return;
 589                         # Try file cache
 590                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 591                                 wfDebug( __METHOD__ . ": done file cache\n" );
 592                                 # tell wgOut that output is taken care of
 593                                 $outputPage->disable();
 594                                 $this->mPage->doViewUpdates( $user, $oldid );
 595                                 wfProfileOut( __METHOD__ );
 596
 597                                 return;
 598                         }
 599                 }
 600
 601                 # Should the parser cache be used?
 602                 $useParserCache = $this->mPage->isParserCacheUsed( $parserOptions, $oldid );
 603                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 604                 if ( $user->getStubThreshold() ) {
 605                         wfIncrStats( 'pcache_miss_stub' );
 606                 }
 607
 608                 $this->showRedirectedFromHeader();
 609                 $this->showNamespaceHeader();
 610
 611                 # Iterate through the possible ways of constructing the output text.
 612                 # Keep going until $outputDone is set, or we run out of things to do.
 613                 $pass = 0;
 614                 $outputDone = false;
 615                 $this->mParserOutput = false;
 616
 617                 while ( !$outputDone && ++$pass ) {
 618                         switch ( $pass ) {
 619                                 case 1:
 620                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 621                                         break;
 622                                 case 2:
 623                                         # Early abort if the page doesn't exist
 624                                         if ( !$this->mPage->exists() ) {
 625                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 626                                                 $this->showMissingArticle();
 627                                                 $this->mPage->doViewUpdates( $user );
 628                                                 wfProfileOut( __METHOD__ );
 629                                                 return;
 630                                         }
 631
 632                                         # Try the parser cache
 633                                         if ( $useParserCache ) {
 634                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 635
 636                                                 if ( $this->mParserOutput !== false ) {
 637                                                         if ( $oldid ) {
 638                                                                 wfDebug( __METHOD__ . ": showing parser cache contents for current rev permalink\n" );
 639                                                                 $this->setOldSubtitle( $oldid );
 640                                                         } else {
 641                                                                 wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 642                                                         }
 643                                                         $outputPage->addParserOutput( $this->mParserOutput );
 644                                                         # Ensure that UI elements requiring revision ID have
 645                                                         # the correct version information.
 646                                                         $outputPage->setRevisionId( $this->mPage->getLatest() );
 647                                                         # Preload timestamp to avoid a DB hit
 648                                                         $cachedTimestamp = $this->mParserOutput->getTimestamp();
 649                                                         if ( $cachedTimestamp !== null ) {
 650                                                                 $outputPage->setRevisionTimestamp( $cachedTimestamp );
 651                                                                 $this->mPage->setTimestamp( $cachedTimestamp );
 652                                                         }
 653                                                         $outputDone = true;
 654                                                 }
 655                                         }
 656                                         break;
 657                                 case 3:
 658                                         # This will set $this->mRevision if needed
 659                                         $this->fetchContentObject();
 660
 661                                         # Are we looking at an old revision
 662                                         if ( $oldid && $this->mRevision ) {
 663                                                 $this->setOldSubtitle( $oldid );
 664
 665                                                 if ( !$this->showDeletedRevisionHeader() ) {
 666                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 667                                                         wfProfileOut( __METHOD__ );
 668                                                         return;
 669                                                 }
 670                                         }
 671
 672                                         # Ensure that UI elements requiring revision ID have
 673                                         # the correct version information.
 674                                         $outputPage->setRevisionId( $this->getRevIdFetched() );
 675                                         # Preload timestamp to avoid a DB hit
 676                                         $outputPage->setRevisionTimestamp( $this->getTimestamp() );
 677
 678                                         # Pages containing custom CSS or JavaScript get special treatment
 679                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 680                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 681                                                 $this->showCssOrJsPage();
 682                                                 $outputDone = true;
 683                                         } elseif ( !wfRunHooks( 'ArticleContentViewCustom',
 684                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 685
 686                                                 # Allow extensions do their own custom view for certain pages
 687                                                 $outputDone = true;
 688                                         } elseif ( !ContentHandler::runLegacyHooks( 'ArticleViewCustom',
 689                                                         array( $this->fetchContentObject(), $this->getTitle(), $outputPage ) ) ) {
 690
 691                                                 # Allow extensions do their own custom view for certain pages
 692                                                 $outputDone = true;
 693                                         }
 694                                         break;
 695                                 case 4:
 696                                         # Run the parse, protected by a pool counter
 697                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 698
 699                                         $content = $this->getContentObject();
 700                                         $poolArticleView = new PoolWorkArticleView( $this->getPage(), $parserOptions,
 701                                                 $this->getRevIdFetched(), $useParserCache, $content );
 702
 703                                         if ( !$poolArticleView->execute() ) {
 704                                                 $error = $poolArticleView->getError();
 705                                                 if ( $error ) {
 706                                                         $outputPage->clearHTML(); // for release() errors
 707                                                         $outputPage->enableClientCache( false );
 708                                                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
 709
 710                                                         $errortext = $error->getWikiText( false, 'view-pool-error' );
 711                                                         $outputPage->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
 712                                                 }
 713                                                 # Connection or timeout error
 714                                                 wfProfileOut( __METHOD__ );
 715                                                 return;
 716                                         }
 717
 718                                         $this->mParserOutput = $poolArticleView->getParserOutput();
 719                                         $outputPage->addParserOutput( $this->mParserOutput );
 720                                         if ( $content->getRedirectTarget() ) {
 721                                                 $outputPage->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
 722                                         }
 723
 724                                         # Don't cache a dirty ParserOutput object
 725                                         if ( $poolArticleView->getIsDirty() ) {
 726                                                 $outputPage->setSquidMaxage( 0 );
 727                                                 $outputPage->addHTML( "<!-- parser cache is expired, " .
 728                                                         "sending anyway due to pool overload-->\n" );
 729                                         }
 730
 731                                         $outputDone = true;
 732                                         break;
 733                                 # Should be unreachable, but just in case...
 734                                 default:
 735                                         break 2;
 736                         }
 737                 }
 738
 739                 # Get the ParserOutput actually *displayed* here.
 740                 # Note that $this->mParserOutput is the *current* version output.
 741                 $pOutput = ( $outputDone instanceof ParserOutput )
 742                         ? $outputDone // object fetched by hook
 743                         : $this->mParserOutput;
 744
 745                 # Adjust title for main page & pages with displaytitle
 746                 if ( $pOutput ) {
 747                         $this->adjustDisplayTitle( $pOutput );
 748                 }
 749
 750                 # For the main page, overwrite the <title> element with the con-
 751                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 752                 # that's not empty).
 753                 # This message always exists because it is in the i18n files
 754                 if ( $this->getTitle()->isMainPage() ) {
 755                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 756                         if ( !$msg->isDisabled() ) {
 757                                 $outputPage->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 758                         }
 759                 }
 760
 761                 # Check for any __NOINDEX__ tags on the page using $pOutput
 762                 $policy = $this->getRobotPolicy( 'view', $pOutput );
 763                 $outputPage->setIndexPolicy( $policy['index'] );
 764                 $outputPage->setFollowPolicy( $policy['follow'] );
 765
 766                 $this->showViewFooter();
 767                 $this->mPage->doViewUpdates( $user, $oldid );
 768
 769                 $outputPage->addModules( 'mediawiki.action.view.postEdit' );
 770
 771                 wfProfileOut( __METHOD__ );
 772         }
 773
 774         /**
 775          * Adjust title for pages with displaytitle, -{T|}- or language conversion
 776          * @param ParserOutput $pOutput
 777          */
 778         public function adjustDisplayTitle( ParserOutput $pOutput ) {
 779                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 780                 $titleText = $pOutput->getTitleText();
 781                 if ( strval( $titleText ) !== '' ) {
 782                         $this->getContext()->getOutput()->setPageTitle( $titleText );
 783                 }
 784         }
 785
 786         /**
 787          * Show a diff page according to current request variables. For use within
 788          * Article::view() only, other callers should use the DifferenceEngine class.
 789          *
 790          * @todo Make protected
 791          */
 792         public function showDiffPage() {
 793                 $request = $this->getContext()->getRequest();
 794                 $user = $this->getContext()->getUser();
 795                 $diff = $request->getVal( 'diff' );
 796                 $rcid = $request->getVal( 'rcid' );
 797                 $diffOnly = $request->getBool( 'diffonly', $user->getOption( 'diffonly' ) );
 798                 $purge = $request->getVal( 'action' ) == 'purge';
 799                 $unhide = $request->getInt( 'unhide' ) == 1;
 800                 $oldid = $this->getOldID();
 801
 802                 $rev = $this->getRevisionFetched();
 803
 804                 if ( !$rev ) {
 805                         $this->getContext()->getOutput()->setPageTitle( wfMessage( 'errorpagetitle' ) );
 806                         $this->getContext()->getOutput()->addWikiMsg( 'difference-missing-revision', $oldid, 1 );
 807                         return;
 808                 }
 809
 810                 $contentHandler = $rev->getContentHandler();
 811                 $de = $contentHandler->createDifferenceEngine(
 812                         $this->getContext(),
 813                         $oldid,
 814                         $diff,
 815                         $rcid,
 816                         $purge,
 817                         $unhide
 818                 );
 819
 820                 // DifferenceEngine directly fetched the revision:
 821                 $this->mRevIdFetched = $de->mNewid;
 822                 $de->showDiffPage( $diffOnly );
 823
 824                 // Run view updates for the newer revision being diffed (and shown
 825                 // below the diff if not $diffOnly).
 826                 list( $old, $new ) = $de->mapDiffPrevNext( $oldid, $diff );
 827                 // New can be false, convert it to 0 - this conveniently means the latest revision
 828                 $this->mPage->doViewUpdates( $user, (int)$new );
 829         }
 830
 831         /**
 832          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 833          * Article::view() only.
 834          *
 835          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 836          * page views.
 837          *
 838          * @param bool $showCacheHint Whether to show a message telling the user
 839          *   to clear the browser cache (default: true).
 840          */
 841         protected function showCssOrJsPage( $showCacheHint = true ) {
 842                 $outputPage = $this->getContext()->getOutput();
 843
 844                 if ( $showCacheHint ) {
 845                         $dir = $this->getContext()->getLanguage()->getDir();
 846                         $lang = $this->getContext()->getLanguage()->getCode();
 847
 848                         $outputPage->wrapWikiMsg(
 849                                 "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 850                                 'clearyourcache'
 851                         );
 852                 }
 853
 854                 $this->fetchContentObject();
 855
 856                 if ( $this->mContentObject ) {
 857                         // Give hooks a chance to customise the output
 858                         if ( ContentHandler::runLegacyHooks(
 859                                 'ShowRawCssJs',
 860                                 array( $this->mContentObject, $this->getTitle(), $outputPage ) )
 861                         ) {
 862                                 $po = $this->mContentObject->getParserOutput( $this->getTitle() );
 863                                 $outputPage->addHTML( $po->getText() );
 864                         }
 865                 }
 866         }
 867
 868         /**
 869          * Get the robot policy to be used for the current view
 870          * @param string $action The action= GET parameter
 871          * @param ParserOutput|null $pOutput
 872          * @return array The policy that should be set
 873          * @todo: actions other than 'view'
 874          */
 875         public function getRobotPolicy( $action, $pOutput = null ) {
 876                 global $wgArticleRobotPolicies, $wgNamespaceRobotPolicies, $wgDefaultRobotPolicy;
 877
 878                 $ns = $this->getTitle()->getNamespace();
 879
 880                 # Don't index user and user talk pages for blocked users (bug 11443)
 881                 if ( ( $ns == NS_USER || $ns == NS_USER_TALK ) && !$this->getTitle()->isSubpage() ) {
 882                         $specificTarget = null;
 883                         $vagueTarget = null;
 884                         $titleText = $this->getTitle()->getText();
 885                         if ( IP::isValid( $titleText ) ) {
 886                                 $vagueTarget = $titleText;
 887                         } else {
 888                                 $specificTarget = $titleText;
 889                         }
 890                         if ( Block::newFromTarget( $specificTarget, $vagueTarget ) instanceof Block ) {
 891                                 return array(
 892                                         'index' => 'noindex',
 893                                         'follow' => 'nofollow'
 894                                 );
 895                         }
 896                 }
 897
 898                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 899                         # Non-articles (special pages etc), and old revisions
 900                         return array(
 901                                 'index' => 'noindex',
 902                                 'follow' => 'nofollow'
 903                         );
 904                 } elseif ( $this->getContext()->getOutput()->isPrintable() ) {
 905                         # Discourage indexing of printable versions, but encourage following
 906                         return array(
 907                                 'index' => 'noindex',
 908                                 'follow' => 'follow'
 909                         );
 910                 } elseif ( $this->getContext()->getRequest()->getInt( 'curid' ) ) {
 911                         # For ?curid=x urls, disallow indexing
 912                         return array(
 913                                 'index' => 'noindex',
 914                                 'follow' => 'follow'
 915                         );
 916                 }
 917
 918                 # Otherwise, construct the policy based on the various config variables.
 919                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 920
 921                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 922                         # Honour customised robot policies for this namespace
 923                         $policy = array_merge(
 924                                 $policy,
 925                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 926                         );
 927                 }
 928                 if ( $this->getTitle()->canUseNoindex() && is_object( $pOutput ) && $pOutput->getIndexPolicy() ) {
 929                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 930                         # a final sanity check that we have really got the parser output.
 931                         $policy = array_merge(
 932                                 $policy,
 933                                 array( 'index' => $pOutput->getIndexPolicy() )
 934                         );
 935                 }
 936
 937                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 938                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 939                         $policy = array_merge(
 940                                 $policy,
 941                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 942                         );
 943                 }
 944
 945                 return $policy;
 946         }
 947
 948         /**
 949          * Converts a String robot policy into an associative array, to allow
 950          * merging of several policies using array_merge().
 951          * @param array|string $policy Returns empty array on null/false/'', transparent
 952          *   to already-converted arrays, converts string.
 953          * @return array 'index' => \<indexpolicy\>, 'follow' => \<followpolicy\>
 954          */
 955         public static function formatRobotPolicy( $policy ) {
 956                 if ( is_array( $policy ) ) {
 957                         return $policy;
 958                 } elseif ( !$policy ) {
 959                         return array();
 960                 }
 961
 962                 $policy = explode( ',', $policy );
 963                 $policy = array_map( 'trim', $policy );
 964
 965                 $arr = array();
 966                 foreach ( $policy as $var ) {
 967                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 968                                 $arr['index'] = $var;
 969                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 970                                 $arr['follow'] = $var;
 971                         }
 972                 }
 973
 974                 return $arr;
 975         }
 976
 977         /**
 978          * If this request is a redirect view, send "redirected from" subtitle to
 979          * the output. Returns true if the header was needed, false if this is not
 980          * a redirect view. Handles both local and remote redirects.
 981          *
 982          * @return bool
 983          */
 984         public function showRedirectedFromHeader() {
 985                 global $wgRedirectSources;
 986                 $outputPage = $this->getContext()->getOutput();
 987
 988                 $rdfrom = $this->getContext()->getRequest()->getVal( 'rdfrom' );
 989
 990                 if ( isset( $this->mRedirectedFrom ) ) {
 991                         // This is an internally redirected page view.
 992                         // We'll need a backlink to the source page for navigation.
 993                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 994                                 $redir = Linker::linkKnown(
 995                                         $this->mRedirectedFrom,
 996                                         null,
 997                                         array(),
 998                                         array( 'redirect' => 'no' )
 999                                 );
1000
1001                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1002
1003                                 // Set the fragment if one was specified in the redirect
1004                                 if ( $this->getTitle()->hasFragment() ) {
1005                                         $outputPage->addJsConfigVars( 'wgRedirectToFragment', $this->getTitle()->getFragmentForURL() );
1006                                         $outputPage->addModules( 'mediawiki.action.view.redirectToFragment' );
1007                                 }
1008
1009                                 // Add a <link rel="canonical"> tag
1010                                 $outputPage->setCanonicalUrl( $this->getTitle()->getLocalURL() );
1011
1012                                 // Tell the output object that the user arrived at this article through a redirect
1013                                 $outputPage->setRedirectedFrom( $this->mRedirectedFrom );
1014
1015                                 return true;
1016                         }
1017                 } elseif ( $rdfrom ) {
1018                         // This is an externally redirected view, from some other wiki.
1019                         // If it was reported from a trusted site, supply a backlink.
1020                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
1021                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
1022                                 $outputPage->addSubtitle( wfMessage( 'redirectedfrom' )->rawParams( $redir ) );
1023
1024                                 return true;
1025                         }
1026                 }
1027
1028                 return false;
1029         }
1030
1031         /**
1032          * Show a header specific to the namespace currently being viewed, like
1033          * [[MediaWiki:Talkpagetext]]. For Article::view().
1034          */
1035         public function showNamespaceHeader() {
1036                 if ( $this->getTitle()->isTalkPage() ) {
1037                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
1038                                 $this->getContext()->getOutput()->wrapWikiMsg(
1039                                         "<div class=\"mw-talkpageheader\">\n$1\n</div>",
1040                                         array( 'talkpageheader' )
1041                                 );
1042                         }
1043                 }
1044         }
1045
1046         /**
1047          * Show the footer section of an ordinary page view
1048          */
1049         public function showViewFooter() {
1050                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
1051                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK
1052                         && IP::isValid( $this->getTitle()->getText() )
1053                 ) {
1054                         $this->getContext()->getOutput()->addWikiMsg( 'anontalkpagetext' );
1055                 }
1056
1057                 // Show a footer allowing the user to patrol the shown revision or page if possible
1058                 $patrolFooterShown = $this->showPatrolFooter();
1059
1060                 wfRunHooks( 'ArticleViewFooter', array( $this, $patrolFooterShown ) );
1061         }
1062
1063         /**
1064          * If patrol is possible, output a patrol UI box. This is called from the
1065          * footer section of ordinary page views. If patrol is not possible or not
1066          * desired, does nothing.
1067          * Side effect: When the patrol link is build, this method will call
1068          * OutputPage::preventClickjacking() and load mediawiki.page.patrol.ajax.
1069          *
1070          * @return bool
1071          */
1072         public function showPatrolFooter() {
1073                 global $wgUseNPPatrol, $wgUseRCPatrol, $wgEnableAPI, $wgEnableWriteAPI;
1074
1075                 $outputPage = $this->getContext()->getOutput();
1076                 $user = $this->getContext()->getUser();
1077                 $cache = wfGetMainCache();
1078                 $rc = false;
1079
1080                 if ( !$this->getTitle()->quickUserCan( 'patrol', $user )
1081                         || !( $wgUseRCPatrol || $wgUseNPPatrol )
1082                 ) {
1083                         // Patrolling is disabled or the user isn't allowed to
1084                         return false;
1085                 }
1086
1087                 wfProfileIn( __METHOD__ );
1088
1089                 // New page patrol: Get the timestamp of the oldest revison which
1090                 // the revision table holds for the given page. Then we look
1091                 // whether it's within the RC lifespan and if it is, we try
1092                 // to get the recentchanges row belonging to that entry
1093                 // (with rc_new = 1).
1094
1095                 // Check for cached results
1096                 if ( $cache->get( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ) ) ) {
1097                         wfProfileOut( __METHOD__ );
1098                         return false;
1099                 }
1100
1101                 if ( $this->mRevision
1102                         && !RecentChange::isInRCLifespan( $this->mRevision->getTimestamp(), 21600 )
1103                 ) {
1104                         // The current revision is already older than what could be in the RC table
1105                         // 6h tolerance because the RC might not be cleaned out regularly
1106                         wfProfileOut( __METHOD__ );
1107                         return false;
1108                 }
1109
1110                 $dbr = wfGetDB( DB_SLAVE );
1111                 $oldestRevisionTimestamp = $dbr->selectField(
1112                         'revision',
1113                         'MIN( rev_timestamp )',
1114                         array( 'rev_page' => $this->getTitle()->getArticleID() ),
1115                         __METHOD__
1116                 );
1117
1118                 if ( $oldestRevisionTimestamp
1119                         && RecentChange::isInRCLifespan( $oldestRevisionTimestamp, 21600 )
1120                 ) {
1121                         // 6h tolerance because the RC might not be cleaned out regularly
1122                         $rc = RecentChange::newFromConds(
1123                                 array(
1124                                         'rc_new' => 1,
1125                                         'rc_timestamp' => $oldestRevisionTimestamp,
1126                                         'rc_namespace' => $this->getTitle()->getNamespace(),
1127                                         'rc_cur_id' => $this->getTitle()->getArticleID(),
1128                                         'rc_patrolled' => 0
1129                                 ),
1130                                 __METHOD__,
1131                                 array( 'USE INDEX' => 'new_name_timestamp' )
1132                         );
1133                 }
1134
1135                 if ( !$rc ) {
1136                         // No RC entry around
1137
1138                         // Cache the information we gathered above in case we can't patrol
1139                         // Don't cache in case we can patrol as this could change
1140                         $cache->set( wfMemcKey( 'NotPatrollablePage', $this->getTitle()->getArticleID() ), '1' );
1141
1142                         wfProfileOut( __METHOD__ );
1143                         return false;
1144                 }
1145
1146                 if ( $rc->getPerformer()->getName() == $user->getName() ) {
1147                         // Don't show a patrol link for own creations. If the user could
1148                         // patrol them, they already would be patrolled
1149                         wfProfileOut( __METHOD__ );
1150                         return false;
1151                 }
1152
1153                 $rcid = $rc->getAttribute( 'rc_id' );
1154
1155                 $token = $user->getEditToken( $rcid );
1156
1157                 $outputPage->preventClickjacking();
1158                 if ( $wgEnableAPI && $wgEnableWriteAPI && $user->isAllowed( 'writeapi' ) ) {
1159                         $outputPage->addModules( 'mediawiki.page.patrol.ajax' );
1160                 }
1161
1162                 $link = Linker::linkKnown(
1163                         $this->getTitle(),
1164                         wfMessage( 'markaspatrolledtext' )->escaped(),
1165                         array(),
1166                         array(
1167                                 'action' => 'markpatrolled',
1168                                 'rcid' => $rcid,
1169                                 'token' => $token,
1170                         )
1171                 );
1172
1173                 $outputPage->addHTML(
1174                         "<div class='patrollink'>" .
1175                                 wfMessage( 'markaspatrolledlink' )->rawParams( $link )->escaped() .
1176                         '</div>'
1177                 );
1178
1179                 wfProfileOut( __METHOD__ );
1180                 return true;
1181         }
1182
1183         /**
1184          * Show the error text for a missing article. For articles in the MediaWiki
1185          * namespace, show the default message text. To be called from Article::view().
1186          */
1187         public function showMissingArticle() {
1188                 global $wgSend404Code;
1189                 $outputPage = $this->getContext()->getOutput();
1190                 // Whether the page is a root user page of an existing user (but not a subpage)
1191                 $validUserPage = false;
1192
1193                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
1194                 if ( $this->getTitle()->getNamespace() == NS_USER
1195                         || $this->getTitle()->getNamespace() == NS_USER_TALK
1196                 ) {
1197                         $parts = explode( '/', $this->getTitle()->getText() );
1198                         $rootPart = $parts[0];
1199                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
1200                         $ip = User::isIP( $rootPart );
1201
1202                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1203                                 $outputPage->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
1204                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
1205                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1206                                 LogEventsList::showLogExtract(
1207                                         $outputPage,
1208                                         'block',
1209                                         $user->getUserPage(),
1210                                         '',
1211                                         array(
1212                                                 'lim' => 1,
1213                                                 'showIfEmpty' => false,
1214                                                 'msgKey' => array(
1215                                                         'blocked-notice-logextract',
1216                                                         $user->getName() # Support GENDER in notice
1217                                                 )
1218                                         )
1219                                 );
1220                                 $validUserPage = !$this->getTitle()->isSubpage();
1221                         } else {
1222                                 $validUserPage = !$this->getTitle()->isSubpage();
1223                         }
1224                 }
1225
1226                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
1227
1228                 // Give extensions a chance to hide their (unrelated) log entries
1229                 $logTypes = array( 'delete', 'move' );
1230                 $conds = array( "log_action != 'revision'" );
1231                 wfRunHooks( 'Article::MissingArticleConditions', array( &$conds, $logTypes ) );
1232
1233                 # Show delete and move logs
1234                 LogEventsList::showLogExtract( $outputPage, $logTypes, $this->getTitle(), '',
1235                         array( 'lim' => 10,
1236                                 'conds' => $conds,
1237                                 'showIfEmpty' => false,
1238                                 'msgKey' => array( 'moveddeleted-notice' ) )
1239                 );
1240
1241                 if ( !$this->mPage->hasViewableContent() && $wgSend404Code && !$validUserPage ) {
1242                         // If there's no backing content, send a 404 Not Found
1243                         // for better machine handling of broken links.
1244                         $this->getContext()->getRequest()->response()->header( "HTTP/1.1 404 Not Found" );
1245                 }
1246
1247                 if ( $validUserPage ) {
1248                         // Also apply the robot policy for nonexisting user pages (as those aren't served as 404)
1249                         $policy = $this->getRobotPolicy( 'view' );
1250                         $outputPage->setIndexPolicy( $policy['index'] );
1251                         $outputPage->setFollowPolicy( $policy['follow'] );
1252                 }
1253
1254                 $hookResult = wfRunHooks( 'BeforeDisplayNoArticleText', array( $this ) );
1255
1256                 if ( ! $hookResult ) {
1257                         return;
1258                 }
1259
1260                 # Show error message
1261                 $oldid = $this->getOldID();
1262                 if ( $oldid ) {
1263                         $text = wfMessage( 'missing-revision', $oldid )->plain();
1264                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
1265                         // Use the default message text
1266                         $text = $this->getTitle()->getDefaultMessageText();
1267                 } elseif ( $this->getTitle()->quickUserCan( 'create', $this->getContext()->getUser() )
1268                         && $this->getTitle()->quickUserCan( 'edit', $this->getContext()->getUser() )
1269                 ) {
1270                         $message = $this->getContext()->getUser()->isLoggedIn() ? 'noarticletext' : 'noarticletextanon';
1271                         $text = wfMessage( $message )->plain();
1272                 } else {
1273                         $text = wfMessage( 'noarticletext-nopermission' )->plain();
1274                 }
1275                 $text = "<div class='noarticletext'>\n$text\n</div>";
1276
1277                 $outputPage->addWikiText( $text );
1278         }
1279
1280         /**
1281          * If the revision requested for view is deleted, check permissions.
1282          * Send either an error message or a warning header to the output.
1283          *
1284          * @return bool true if the view is allowed, false if not.
1285          */
1286         public function showDeletedRevisionHeader() {
1287                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
1288                         // Not deleted
1289                         return true;
1290                 }
1291
1292                 $outputPage = $this->getContext()->getOutput();
1293                 $user = $this->getContext()->getUser();
1294                 // If the user is not allowed to see it...
1295                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT, $user ) ) {
1296                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1297                                 'rev-deleted-text-permission' );
1298
1299                         return false;
1300                 // If the user needs to confirm that they want to see it...
1301                 } elseif ( $this->getContext()->getRequest()->getInt( 'unhide' ) != 1 ) {
1302                         # Give explanation and add a link to view the revision...
1303                         $oldid = intval( $this->getOldID() );
1304                         $link = $this->getTitle()->getFullURL( "oldid={$oldid}&unhide=1" );
1305                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1306                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
1307                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1308                                 array( $msg, $link ) );
1309
1310                         return false;
1311                 // We are allowed to see...
1312                 } else {
1313                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
1314                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
1315                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
1316
1317                         return true;
1318                 }
1319         }
1320
1321         /**
1322          * Generate the navigation links when browsing through an article revisions
1323          * It shows the information as:
1324          *   Revision as of \<date\>; view current revision
1325          *   \<- Previous version | Next Version -\>
1326          *
1327          * @param int $oldid Revision ID of this article revision
1328          */
1329         public function setOldSubtitle( $oldid = 0 ) {
1330                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1331                         return;
1332                 }
1333
1334                 $unhide = $this->getContext()->getRequest()->getInt( 'unhide' ) == 1;
1335
1336                 # Cascade unhide param in links for easy deletion browsing
1337                 $extraParams = array();
1338                 if ( $unhide ) {
1339                         $extraParams['unhide'] = 1;
1340                 }
1341
1342                 if ( $this->mRevision && $this->mRevision->getId() === $oldid ) {
1343                         $revision = $this->mRevision;
1344                 } else {
1345                         $revision = Revision::newFromId( $oldid );
1346                 }
1347
1348                 $timestamp = $revision->getTimestamp();
1349
1350                 $current = ( $oldid == $this->mPage->getLatest() );
1351                 $language = $this->getContext()->getLanguage();
1352                 $user = $this->getContext()->getUser();
1353
1354                 $td = $language->userTimeAndDate( $timestamp, $user );
1355                 $tddate = $language->userDate( $timestamp, $user );
1356                 $tdtime = $language->userTime( $timestamp, $user );
1357
1358                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1359                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1360
1361                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1362                         ? 'revision-info-current'
1363                         : 'revision-info';
1364
1365                 $outputPage = $this->getContext()->getOutput();
1366                 $outputPage->addSubtitle( "<div id=\"mw-{$infomsg}\">" . wfMessage( $infomsg,
1367                         $td )->rawParams( $userlinks )->params( $revision->getID(), $tddate,
1368                         $tdtime, $revision->getUser() )->parse() . "</div>" );
1369
1370                 $lnk = $current
1371                         ? wfMessage( 'currentrevisionlink' )->escaped()
1372                         : Linker::linkKnown(
1373                                 $this->getTitle(),
1374                                 wfMessage( 'currentrevisionlink' )->escaped(),
1375                                 array(),
1376                                 $extraParams
1377                         );
1378                 $curdiff = $current
1379                         ? wfMessage( 'diff' )->escaped()
1380                         : Linker::linkKnown(
1381                                 $this->getTitle(),
1382                                 wfMessage( 'diff' )->escaped(),
1383                                 array(),
1384                                 array(
1385                                         'diff' => 'cur',
1386                                         'oldid' => $oldid
1387                                 ) + $extraParams
1388                         );
1389                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid );
1390                 $prevlink = $prev
1391                         ? Linker::linkKnown(
1392                                 $this->getTitle(),
1393                                 wfMessage( 'previousrevision' )->escaped(),
1394                                 array(),
1395                                 array(
1396                                         'direction' => 'prev',
1397                                         'oldid' => $oldid
1398                                 ) + $extraParams
1399                         )
1400                         : wfMessage( 'previousrevision' )->escaped();
1401                 $prevdiff = $prev
1402                         ? Linker::linkKnown(
1403                                 $this->getTitle(),
1404                                 wfMessage( 'diff' )->escaped(),
1405                                 array(),
1406                                 array(
1407                                         'diff' => 'prev',
1408                                         'oldid' => $oldid
1409                                 ) + $extraParams
1410                         )
1411                         : wfMessage( 'diff' )->escaped();
1412                 $nextlink = $current
1413                         ? wfMessage( 'nextrevision' )->escaped()
1414                         : Linker::linkKnown(
1415                                 $this->getTitle(),
1416                                 wfMessage( 'nextrevision' )->escaped(),
1417                                 array(),
1418                                 array(
1419                                         'direction' => 'next',
1420                                         'oldid' => $oldid
1421                                 ) + $extraParams
1422                         );
1423                 $nextdiff = $current
1424                         ? wfMessage( 'diff' )->escaped()
1425                         : Linker::linkKnown(
1426                                 $this->getTitle(),
1427                                 wfMessage( 'diff' )->escaped(),
1428                                 array(),
1429                                 array(
1430                                         'diff' => 'next',
1431                                         'oldid' => $oldid
1432                                 ) + $extraParams
1433                         );
1434
1435                 $cdel = Linker::getRevDeleteLink( $user, $revision, $this->getTitle() );
1436                 if ( $cdel !== '' ) {
1437                         $cdel .= ' ';
1438                 }
1439
1440                 $outputPage->addSubtitle( "<div id=\"mw-revision-nav\">" . $cdel .
1441                         wfMessage( 'revision-nav' )->rawParams(
1442                                 $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff
1443                         )->escaped() . "</div>" );
1444         }
1445
1446         /**
1447          * Return the HTML for the top of a redirect page
1448          *
1449          * Chances are you should just be using the ParserOutput from
1450          * WikitextContent::getParserOutput instead of calling this for redirects.
1451          *
1452          * @param Title|array $target Destination(s) to redirect
1453          * @param bool $appendSubtitle [optional]
1454          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1455          * @return string Containing HMTL with redirect link
1456          */
1457         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1458                 $lang = $this->getTitle()->getPageLanguage();
1459                 if ( $appendSubtitle ) {
1460                         $out = $this->getContext()->getOutput();
1461                         $out->addSubtitle( wfMessage( 'redirectpagesub' )->parse() );
1462                 }
1463                 return static::getRedirectHeaderHtml( $lang, $target, $forceKnown );
1464         }
1465
1466         /**
1467          * Return the HTML for the top of a redirect page
1468          *
1469          * Chances are you should just be using the ParserOutput from
1470          * WikitextContent::getParserOutput instead of calling this for redirects.
1471          *
1472          * @since 1.23
1473          * @param Language $lang
1474          * @param Title|array $target Destination(s) to redirect
1475          * @param bool $forceKnown Should the image be shown as a bluelink regardless of existence?
1476          * @return string Containing HMTL with redirect link
1477          */
1478         public static function getRedirectHeaderHtml( Language $lang, $target, $forceKnown = false ) {
1479                 global $wgStylePath;
1480
1481                 if ( !is_array( $target ) ) {
1482                         $target = array( $target );
1483                 }
1484
1485                 $imageDir = $lang->getDir();
1486
1487                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1488
1489                 /** @var $title Title */
1490                 $title = array_shift( $target );
1491
1492                 if ( $forceKnown ) {
1493                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1494                 } else {
1495                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1496                 }
1497
1498                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1499                 $alt = $lang->isRTL() ? '←' : '→';
1500
1501                 // Automatically append redirect=no to each link, since most of them are
1502                 // redirect pages themselves.
1503                 /** @var Title $rt */
1504                 foreach ( $target as $rt ) {
1505                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1506                         if ( $forceKnown ) {
1507                                 $link .= Linker::linkKnown(
1508                                         $rt,
1509                                         htmlspecialchars( $rt->getFullText(),
1510                                         array(),
1511                                         array( 'redirect' => 'no' )
1512                                 )
1513                                 );
1514                         } else {
1515                                 $link .= Linker::link(
1516                                         $rt,
1517                                         htmlspecialchars( $rt->getFullText() ),
1518                                         array(),
1519                                         array( 'redirect' => 'no' )
1520                                 );
1521                         }
1522                 }
1523
1524                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1525                 return '<div class="redirectMsg">' .
1526                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1527                         '<span class="redirectText">' . $link . '</span></div>';
1528         }
1529
1530         /**
1531          * Handle action=render
1532          */
1533         public function render() {
1534                 $this->getContext()->getOutput()->setArticleBodyOnly( true );
1535                 $this->getContext()->getOutput()->enableSectionEditLinks( false );
1536                 $this->view();
1537         }
1538
1539         /**
1540          * action=protect handler
1541          */
1542         public function protect() {
1543                 $form = new ProtectionForm( $this );
1544                 $form->execute();
1545         }
1546
1547         /**
1548          * action=unprotect handler (alias)
1549          */
1550         public function unprotect() {
1551                 $this->protect();
1552         }
1553
1554         /**
1555          * UI entry point for page deletion
1556          */
1557         public function delete() {
1558                 # This code desperately needs to be totally rewritten
1559
1560                 $title = $this->getTitle();
1561                 $user = $this->getContext()->getUser();
1562
1563                 # Check permissions
1564                 $permission_errors = $title->getUserPermissionsErrors( 'delete', $user );
1565                 if ( count( $permission_errors ) ) {
1566                         throw new PermissionsError( 'delete', $permission_errors );
1567                 }
1568
1569                 # Read-only check...
1570                 if ( wfReadOnly() ) {
1571                         throw new ReadOnlyError;
1572                 }
1573
1574                 # Better double-check that it hasn't been deleted yet!
1575                 $this->mPage->loadPageData( 'fromdbmaster' );
1576                 if ( !$this->mPage->exists() ) {
1577                         $deleteLogPage = new LogPage( 'delete' );
1578                         $outputPage = $this->getContext()->getOutput();
1579                         $outputPage->setPageTitle( wfMessage( 'cannotdelete-title', $title->getPrefixedText() ) );
1580                         $outputPage->wrapWikiMsg( "<div class=\"error mw-error-cannotdelete\">\n$1\n</div>",
1581                                         array( 'cannotdelete', wfEscapeWikiText( $title->getPrefixedText() ) )
1582                                 );
1583                         $outputPage->addHTML(
1584                                 Xml::element( 'h2', null, $deleteLogPage->getName()->text() )
1585                         );
1586                         LogEventsList::showLogExtract(
1587                                 $outputPage,
1588                                 'delete',
1589                                 $title
1590                         );
1591
1592                         return;
1593                 }
1594
1595                 $request = $this->getContext()->getRequest();
1596                 $deleteReasonList = $request->getText( 'wpDeleteReasonList', 'other' );
1597                 $deleteReason = $request->getText( 'wpReason' );
1598
1599                 if ( $deleteReasonList == 'other' ) {
1600                         $reason = $deleteReason;
1601                 } elseif ( $deleteReason != '' ) {
1602                         // Entry from drop down menu + additional comment
1603                         $colonseparator = wfMessage( 'colon-separator' )->inContentLanguage()->text();
1604                         $reason = $deleteReasonList . $colonseparator . $deleteReason;
1605                 } else {
1606                         $reason = $deleteReasonList;
1607                 }
1608
1609                 if ( $request->wasPosted() && $user->matchEditToken( $request->getVal( 'wpEditToken' ),
1610                         array( 'delete', $this->getTitle()->getPrefixedText() ) )
1611                 ) {
1612                         # Flag to hide all contents of the archived revisions
1613                         $suppress = $request->getVal( 'wpSuppress' ) && $user->isAllowed( 'suppressrevision' );
1614
1615                         $this->doDelete( $reason, $suppress );
1616
1617                         WatchAction::doWatchOrUnwatch( $request->getCheck( 'wpWatch' ), $title, $user );
1618
1619                         return;
1620                 }
1621
1622                 // Generate deletion reason
1623                 $hasHistory = false;
1624                 if ( !$reason ) {
1625                         try {
1626                                 $reason = $this->generateReason( $hasHistory );
1627                         } catch ( MWException $e ) {
1628                                 # if a page is horribly broken, we still want to be able to
1629                                 # delete it. So be lenient about errors here.
1630                                 wfDebug( "Error while building auto delete summary: $e" );
1631                                 $reason = '';
1632                         }
1633                 }
1634
1635                 // If the page has a history, insert a warning
1636                 if ( $hasHistory ) {
1637                         $revisions = $this->mTitle->estimateRevisionCount();
1638                         // @todo FIXME: i18n issue/patchwork message
1639                         $this->getContext()->getOutput()->addHTML( '<strong class="mw-delete-warning-revisions">' .
1640                                 wfMessage( 'historywarning' )->numParams( $revisions )->parse() .
1641                                 wfMessage( 'word-separator' )->plain() . Linker::linkKnown( $title,
1642                                         wfMessage( 'history' )->escaped(),
1643                                         array( 'rel' => 'archives' ),
1644                                         array( 'action' => 'history' ) ) .
1645                                 '</strong>'
1646                         );
1647
1648                         if ( $this->mTitle->isBigDeletion() ) {
1649                                 global $wgDeleteRevisionsLimit;
1650                                 $this->getContext()->getOutput()->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1651                                         array(
1652                                                 'delete-warning-toobig',
1653                                                 $this->getContext()->getLanguage()->formatNum( $wgDeleteRevisionsLimit )
1654                                         )
1655                                 );
1656                         }
1657                 }
1658
1659                 $this->confirmDelete( $reason );
1660         }
1661
1662         /**
1663          * Output deletion confirmation dialog
1664          * @todo FIXME: Move to another file?
1665          * @param string $reason Prefilled reason
1666          */
1667         public function confirmDelete( $reason ) {
1668                 wfDebug( "Article::confirmDelete\n" );
1669
1670                 $outputPage = $this->getContext()->getOutput();
1671                 $outputPage->setPageTitle( wfMessage( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1672                 $outputPage->addBacklinkSubtitle( $this->getTitle() );
1673                 $outputPage->setRobotPolicy( 'noindex,nofollow' );
1674                 $backlinkCache = $this->getTitle()->getBacklinkCache();
1675                 if ( $backlinkCache->hasLinks( 'pagelinks' ) || $backlinkCache->hasLinks( 'templatelinks' ) ) {
1676                         $outputPage->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
1677                                 'deleting-backlinks-warning' );
1678                 }
1679                 $outputPage->addWikiMsg( 'confirmdeletetext' );
1680
1681                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $outputPage, &$reason ) );
1682
1683                 $user = $this->getContext()->getUser();
1684
1685                 if ( $user->isAllowed( 'suppressrevision' ) ) {
1686                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1687                                         <td></td>
1688                                         <td class='mw-input'><strong>" .
1689                                                 Xml::checkLabel( wfMessage( 'revdelete-suppress' )->text(),
1690                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1691                                         "</strong></td>
1692                                 </tr>";
1693                 } else {
1694                         $suppress = '';
1695                 }
1696                 $checkWatch = $user->getBoolOption( 'watchdeletion' ) || $user->isWatched( $this->getTitle() );
1697
1698                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1699                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1700                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1701                         Xml::tags( 'legend', null, wfMessage( 'delete-legend' )->escaped() ) .
1702                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1703                         "<tr id=\"wpDeleteReasonListRow\">
1704                                 <td class='mw-label'>" .
1705                                         Xml::label( wfMessage( 'deletecomment' )->text(), 'wpDeleteReasonList' ) .
1706                                 "</td>
1707                                 <td class='mw-input'>" .
1708                                         Xml::listDropDown(
1709                                                 'wpDeleteReasonList',
1710                                                 wfMessage( 'deletereason-dropdown' )->inContentLanguage()->text(),
1711                                                 wfMessage( 'deletereasonotherlist' )->inContentLanguage()->text(),
1712                                                 '',
1713                                                 'wpReasonDropDown',
1714                                                 1
1715                                         ) .
1716                                 "</td>
1717                         </tr>
1718                         <tr id=\"wpDeleteReasonRow\">
1719                                 <td class='mw-label'>" .
1720                                         Xml::label( wfMessage( 'deleteotherreason' )->text(), 'wpReason' ) .
1721                                 "</td>
1722                                 <td class='mw-input'>" .
1723                                 Html::input( 'wpReason', $reason, 'text', array(
1724                                         'size' => '60',
1725                                         'maxlength' => '255',
1726                                         'tabindex' => '2',
1727                                         'id' => 'wpReason',
1728                                         'autofocus'
1729                                 ) ) .
1730                                 "</td>
1731                         </tr>";
1732
1733                 # Disallow watching if user is not logged in
1734                 if ( $user->isLoggedIn() ) {
1735                         $form .= "
1736                         <tr>
1737                                 <td></td>
1738                                 <td class='mw-input'>" .
1739                                         Xml::checkLabel( wfMessage( 'watchthis' )->text(),
1740                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1741                                 "</td>
1742                         </tr>";
1743                 }
1744
1745                 $form .= "
1746                         $suppress
1747                         <tr>
1748                                 <td></td>
1749                                 <td class='mw-submit'>" .
1750                                         Xml::submitButton( wfMessage( 'deletepage' )->text(),
1751                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1752                                 "</td>
1753                         </tr>" .
1754                         Xml::closeElement( 'table' ) .
1755                         Xml::closeElement( 'fieldset' ) .
1756                         Html::hidden(
1757                                 'wpEditToken',
1758                                 $user->getEditToken( array( 'delete', $this->getTitle()->getPrefixedText() ) )
1759                         ) .
1760                         Xml::closeElement( 'form' );
1761
1762                         if ( $user->isAllowed( 'editinterface' ) ) {
1763                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1764                                 $link = Linker::link(
1765                                         $title,
1766                                         wfMessage( 'delete-edit-reasonlist' )->escaped(),
1767                                         array(),
1768                                         array( 'action' => 'edit' )
1769                                 );
1770                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1771                         }
1772
1773                 $outputPage->addHTML( $form );
1774
1775                 $deleteLogPage = new LogPage( 'delete' );
1776                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1777                 LogEventsList::showLogExtract( $outputPage, 'delete',
1778                         $this->getTitle()
1779                 );
1780         }
1781
1782         /**
1783          * Perform a deletion and output success or failure messages
1784          * @param string $reason
1785          * @param bool $suppress
1786          */
1787         public function doDelete( $reason, $suppress = false ) {
1788                 $error = '';
1789                 $outputPage = $this->getContext()->getOutput();
1790                 $status = $this->mPage->doDeleteArticleReal( $reason, $suppress, 0, true, $error );
1791
1792                 if ( $status->isGood() ) {
1793                         $deleted = $this->getTitle()->getPrefixedText();
1794
1795                         $outputPage->setPageTitle( wfMessage( 'actioncomplete' ) );
1796                         $outputPage->setRobotPolicy( 'noindex,nofollow' );
1797
1798                         $loglink = '[[Special:Log/delete|' . wfMessage( 'deletionlog' )->text() . ']]';
1799
1800                         $outputPage->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1801                         $outputPage->returnToMain( false );
1802                 } else {
1803                         $outputPage->setPageTitle(
1804                                 wfMessage( 'cannotdelete-title',
1805                                         $this->getTitle()->getPrefixedText() )
1806                         );
1807
1808                         if ( $error == '' ) {
1809                                 $outputPage->addWikiText(
1810                                         "<div class=\"error mw-error-cannotdelete\">\n" . $status->getWikiText() . "\n</div>"
1811                                 );
1812                                 $deleteLogPage = new LogPage( 'delete' );
1813                                 $outputPage->addHTML( Xml::element( 'h2', null, $deleteLogPage->getName()->text() ) );
1814
1815                                 LogEventsList::showLogExtract(
1816                                         $outputPage,
1817                                         'delete',
1818                                         $this->getTitle()
1819                                 );
1820                         } else {
1821                                 $outputPage->addHTML( $error );
1822                         }
1823                 }
1824         }
1825
1826         /* Caching functions */
1827
1828         /**
1829          * checkLastModified returns true if it has taken care of all
1830          * output to the client that is necessary for this request.
1831          * (that is, it has sent a cached version of the page)
1832          *
1833          * @return bool true if cached version send, false otherwise
1834          */
1835         protected function tryFileCache() {
1836                 static $called = false;
1837
1838                 if ( $called ) {
1839                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1840                         return false;
1841                 }
1842
1843                 $called = true;
1844                 if ( $this->isFileCacheable() ) {
1845                         $cache = HTMLFileCache::newFromTitle( $this->getTitle(), 'view' );
1846                         if ( $cache->isCacheGood( $this->mPage->getTouched() ) ) {
1847                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1848                                 $cache->loadFromFileCache( $this->getContext() );
1849                                 return true;
1850                         } else {
1851                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1852                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1853                         }
1854                 } else {
1855                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1856                 }
1857
1858                 return false;
1859         }
1860
1861         /**
1862          * Check if the page can be cached
1863          * @return bool
1864          */
1865         public function isFileCacheable() {
1866                 $cacheable = false;
1867
1868                 if ( HTMLFileCache::useFileCache( $this->getContext() ) ) {
1869                         $cacheable = $this->mPage->getID()
1870                                 && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1871                         // Extension may have reason to disable file caching on some pages.
1872                         if ( $cacheable ) {
1873                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1874                         }
1875                 }
1876
1877                 return $cacheable;
1878         }
1879
1880         /**#@-*/
1881
1882         /**
1883          * Lightweight method to get the parser output for a page, checking the parser cache
1884          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1885          * consider, so it's not appropriate to use there.
1886          *
1887          * @since 1.16 (r52326) for LiquidThreads
1888          *
1889          * @param int|null $oldid Revision ID or null
1890          * @param User $user The relevant user
1891          * @return ParserOutput|bool ParserOutput or false if the given revision ID is not found
1892          */
1893         public function getParserOutput( $oldid = null, User $user = null ) {
1894                 //XXX: bypasses mParserOptions and thus setParserOptions()
1895
1896                 if ( $user === null ) {
1897                         $parserOptions = $this->getParserOptions();
1898                 } else {
1899                         $parserOptions = $this->mPage->makeParserOptions( $user );
1900                 }
1901
1902                 return $this->mPage->getParserOutput( $parserOptions, $oldid );
1903         }
1904
1905         /**
1906          * Override the ParserOptions used to render the primary article wikitext.
1907          *
1908          * @param ParserOptions $options
1909          * @throws MWException if the parser options where already initialized.
1910          */
1911         public function setParserOptions( ParserOptions $options ) {
1912                 if ( $this->mParserOptions ) {
1913                         throw new MWException( "can't change parser options after they have already been set" );
1914                 }
1915
1916                 // clone, so if $options is modified later, it doesn't confuse the parser cache.
1917                 $this->mParserOptions = clone $options;
1918         }
1919
1920         /**
1921          * Get parser options suitable for rendering the primary article wikitext
1922          * @return ParserOptions
1923          */
1924         public function getParserOptions() {
1925                 if ( !$this->mParserOptions ) {
1926                         $this->mParserOptions = $this->mPage->makeParserOptions( $this->getContext() );
1927                 }
1928                 // Clone to allow modifications of the return value without affecting cache
1929                 return clone $this->mParserOptions;
1930         }
1931
1932         /**
1933          * Sets the context this Article is executed in
1934          *
1935          * @param IContextSource $context
1936          * @since 1.18
1937          */
1938         public function setContext( $context ) {
1939                 $this->mContext = $context;
1940         }
1941
1942         /**
1943          * Gets the context this Article is executed in
1944          *
1945          * @return IContextSource
1946          * @since 1.18
1947          */
1948         public function getContext() {
1949                 if ( $this->mContext instanceof IContextSource ) {
1950                         return $this->mContext;
1951                 } else {
1952                         wfDebug( __METHOD__ . " called and \$mContext is null. " .
1953                                 "Return RequestContext::getMain(); for sanity\n" );
1954                         return RequestContext::getMain();
1955                 }
1956         }
1957
1958         /**
1959          * Info about this page
1960          * @deprecated since 1.19
1961          */
1962         public function info() {
1963                 wfDeprecated( __METHOD__, '1.19' );
1964                 Action::factory( 'info', $this )->show();
1965         }
1966
1967         /**
1968          * Handle action=purge
1969          * @deprecated since 1.19
1970          * @return Action|bool|null false if the action is disabled, null if it is not recognised
1971          */
1972         public function purge() {
1973                 return Action::factory( 'purge', $this )->show();
1974         }
1975
1976         /**
1977          * Handle action=revert
1978          * @deprecated since 1.19
1979          */
1980         public function revert() {
1981                 wfDeprecated( __METHOD__, '1.19' );
1982                 Action::factory( 'revert', $this )->show();
1983         }
1984
1985         /**
1986          * Handle action=rollback
1987          * @deprecated since 1.19
1988          */
1989         public function rollback() {
1990                 wfDeprecated( __METHOD__, '1.19' );
1991                 Action::factory( 'rollback', $this )->show();
1992         }
1993
1994         /**
1995          * Use PHP's magic __get handler to handle accessing of
1996          * raw WikiPage fields for backwards compatibility.
1997          *
1998          * @param string $fname Field name
1999          */
2000         public function __get( $fname ) {
2001                 if ( property_exists( $this->mPage, $fname ) ) {
2002                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
2003                         return $this->mPage->$fname;
2004                 }
2005                 trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
2006         }
2007
2008         /**
2009          * Use PHP's magic __set handler to handle setting of
2010          * raw WikiPage fields for backwards compatibility.
2011          *
2012          * @param string $fname Field name
2013          * @param mixed $fvalue New value
2014          */
2015         public function __set( $fname, $fvalue ) {
2016                 if ( property_exists( $this->mPage, $fname ) ) {
2017                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
2018                         $this->mPage->$fname = $fvalue;
2019                 // Note: extensions may want to toss on new fields
2020                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
2021                         $this->mPage->$fname = $fvalue;
2022                 } else {
2023                         trigger_error( 'Inaccessible property via __set(): ' . $fname, E_USER_NOTICE );
2024                 }
2025         }
2026
2027         /**
2028          * Use PHP's magic __call handler to transform instance calls to
2029          * WikiPage functions for backwards compatibility.
2030          *
2031          * @param string $fname Name of called method
2032          * @param array $args Arguments to the method
2033          * @return mixed
2034          */
2035         public function __call( $fname, $args ) {
2036                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2037                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2038                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2039                 }
2040                 trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2041         }
2042
2043         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2044
2045         /**
2046          * @param array $limit
2047          * @param array $expiry
2048          * @param bool $cascade
2049          * @param string $reason
2050          * @param User $user
2051          * @return Status
2052          */
2053         public function doUpdateRestrictions( array $limit, array $expiry, &$cascade,
2054                 $reason, User $user
2055         ) {
2056                 return $this->mPage->doUpdateRestrictions( $limit, $expiry, $cascade, $reason, $user );
2057         }
2058
2059         /**
2060          * @param array $limit
2061          * @param string $reason
2062          * @param int $cascade
2063          * @param array $expiry
2064          * @return bool
2065          */
2066         public function updateRestrictions( $limit = array(), $reason = '',
2067                 &$cascade = 0, $expiry = array()
2068         ) {
2069                 return $this->mPage->doUpdateRestrictions(
2070                         $limit,
2071                         $expiry,
2072                         $cascade,
2073                         $reason,
2074                         $this->getContext()->getUser()
2075                 );
2076         }
2077
2078         /**
2079          * @param string $reason
2080          * @param bool $suppress
2081          * @param int $id
2082          * @param bool $commit
2083          * @param string $error
2084          * @return bool
2085          */
2086         public function doDeleteArticle( $reason, $suppress = false, $id = 0,
2087                 $commit = true, &$error = ''
2088         ) {
2089                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2090         }
2091
2092         /**
2093          * @param string $fromP
2094          * @param string $summary
2095          * @param string $token
2096          * @param bool $bot
2097          * @param array $resultDetails
2098          * @param User|null $user
2099          * @return array
2100          */
2101         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2102                 $user = is_null( $user ) ? $this->getContext()->getUser() : $user;
2103                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2104         }
2105
2106         /**
2107          * @param string $fromP
2108          * @param string $summary
2109          * @param bool $bot
2110          * @param array $resultDetails
2111          * @param User|null $guser
2112          * @return array
2113          */
2114         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2115                 $guser = is_null( $guser ) ? $this->getContext()->getUser() : $guser;
2116                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2117         }
2118
2119         /**
2120          * @param bool $hasHistory
2121          * @return mixed
2122          */
2123         public function generateReason( &$hasHistory ) {
2124                 $title = $this->mPage->getTitle();
2125                 $handler = ContentHandler::getForTitle( $title );
2126                 return $handler->getAutoDeleteReason( $title, $hasHistory );
2127         }
2128
2129         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2130
2131         /**
2132          * @return array
2133          */
2134         public static function selectFields() {
2135                 return WikiPage::selectFields();
2136         }
2137
2138         /**
2139          * @param Title $title
2140          */
2141         public static function onArticleCreate( $title ) {
2142                 WikiPage::onArticleCreate( $title );
2143         }
2144
2145         /**
2146          * @param Title $title
2147          */
2148         public static function onArticleDelete( $title ) {
2149                 WikiPage::onArticleDelete( $title );
2150         }
2151
2152         /**
2153          * @param Title $title
2154          */
2155         public static function onArticleEdit( $title ) {
2156                 WikiPage::onArticleEdit( $title );
2157         }
2158
2159         /**
2160          * @param string $oldtext
2161          * @param string $newtext
2162          * @param int $flags
2163          * @return string
2164          * @deprecated since 1.21, use ContentHandler::getAutosummary() instead
2165          */
2166         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2167                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2168         }
2169         // ******
2170 }