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