includes/Article.php

   1 <?php
   2 /**
   3  * File for articles
   4  * @file
   5  */
   6
   7 /**
   8  * Class for viewing MediaWiki article and history.
   9  *
  10  * This maintains WikiPage functions for backwards compatibility.
  11  *
  12  * @TODO: move and rewrite code to an Action class
  13  *
  14  * See design.txt for an overview.
  15  * Note: edit user interface and cache support functions have been
  16  * moved to separate EditPage and HTMLFileCache classes.
  17  *
  18  * @internal documentation reviewed 15 Mar 2010
  19  */
  20 class Article extends Page {
  21         /**@{{
  22          * @private
  23          */
  24
  25         /**
  26          * @var RequestContext
  27          */
  28         protected $mContext;
  29
  30         /**
  31          * @var WikiPage
  32          */
  33         protected $mPage;
  34
  35         var $mContent;                    // !<
  36         var $mContentLoaded = false;      // !<
  37         var $mOldId;                      // !<
  38
  39         /**
  40          * @var Title
  41          */
  42         var $mRedirectedFrom = null;
  43
  44         /**
  45          * @var mixed: boolean false or URL string
  46          */
  47         var $mRedirectUrl = false;        // !<
  48         var $mRevIdFetched = 0;           // !<
  49
  50         /**
  51          * @var Revision
  52          */
  53         var $mRevision = null;
  54
  55         /**
  56          * @var ParserOutput
  57          */
  58         var $mParserOutput;
  59
  60         /**@}}*/
  61
  62         /**
  63          * Constructor and clear the article
  64          * @param $title Title Reference to a Title object.
  65          * @param $oldId Integer revision ID, null to fetch from request, zero for current
  66          */
  67         public function __construct( Title $title, $oldId = null ) {
  68                 $this->mOldId = $oldId;
  69                 $this->mPage = $this->newPage( $title );
  70         }
  71
  72         protected function newPage( Title $title ) {
  73                 return new WikiPage( $title );
  74         }
  75
  76         /**
  77          * Constructor from a page id
  78          * @param $id Int article ID to load
  79          */
  80         public static function newFromID( $id ) {
  81                 $t = Title::newFromID( $id );
  82                 # @todo FIXME: Doesn't inherit right
  83                 return $t == null ? null : new self( $t );
  84                 # return $t == null ? null : new static( $t ); // PHP 5.3
  85         }
  86
  87         /**
  88          * Create an Article object of the appropriate class for the given page.
  89          *
  90          * @param $title Title
  91          * @param $context RequestContext
  92          * @return Article object
  93          */
  94         public static function newFromTitle( $title, RequestContext $context ) {
  95                 if ( NS_MEDIA == $title->getNamespace() ) {
  96                         // FIXME: where should this go?
  97                         $title = Title::makeTitle( NS_FILE, $title->getDBkey() );
  98                 }
  99
 100                 $page = null;
 101                 wfRunHooks( 'ArticleFromTitle', array( &$title, &$page ) );
 102                 if ( !$page ) {
 103                         switch( $title->getNamespace() ) {
 104                                 case NS_FILE:
 105                                         $page = new ImagePage( $title );
 106                                         break;
 107                                 case NS_CATEGORY:
 108                                         $page = new CategoryPage( $title );
 109                                         break;
 110                                 default:
 111                                         $page = new Article( $title );
 112                         }
 113                 }
 114                 $page->setContext( $context );
 115
 116                 return $page;
 117         }
 118
 119         /**
 120          * Tell the page view functions that this view was redirected
 121          * from another page on the wiki.
 122          * @param $from Title object.
 123          */
 124         public function setRedirectedFrom( Title $from ) {
 125                 $this->mRedirectedFrom = $from;
 126         }
 127
 128         /**
 129          * Get the title object of the article
 130          * @return Title object of this page
 131          */
 132         public function getTitle() {
 133                 return $this->mPage->getTitle();
 134         }
 135
 136         /**
 137          * Clear the object
 138          * @todo FIXME: Shouldn't this be public?
 139          * @private
 140          */
 141         public function clear() {
 142                 $this->mContentLoaded = false;
 143
 144                 $this->mRedirectedFrom = null; # Title object if set
 145                 $this->mRevIdFetched = 0;
 146                 $this->mRedirectUrl = false;
 147
 148                 $this->mPage->clear();
 149         }
 150
 151         /**
 152          * Note that getContent/loadContent do not follow redirects anymore.
 153          * If you need to fetch redirectable content easily, try
 154          * the shortcut in Article::followRedirect()
 155          *
 156          * This function has side effects! Do not use this function if you
 157          * only want the real revision text if any.
 158          *
 159          * @return Return the text of this revision
 160          */
 161         public function getContent() {
 162                 global $wgUser;
 163
 164                 wfProfileIn( __METHOD__ );
 165
 166                 if ( $this->mPage->getID() === 0 ) {
 167                         # If this is a MediaWiki:x message, then load the messages
 168                         # and return the message value for x.
 169                         if ( $this->getTitle()->getNamespace() == NS_MEDIAWIKI ) {
 170                                 $text = $this->getTitle()->getDefaultMessageText();
 171                                 if ( $text === false ) {
 172                                         $text = '';
 173                                 }
 174                         } else {
 175                                 $text = wfMsgExt( $wgUser->isLoggedIn() ? 'noarticletext' : 'noarticletextanon', 'parsemag' );
 176                         }
 177                         wfProfileOut( __METHOD__ );
 178
 179                         return $text;
 180                 } else {
 181                         $this->loadContent();
 182                         wfProfileOut( __METHOD__ );
 183
 184                         return $this->mContent;
 185                 }
 186         }
 187
 188         /**
 189          * @return int The oldid of the article that is to be shown, 0 for the
 190          *             current revision
 191          */
 192         public function getOldID() {
 193                 if ( is_null( $this->mOldId ) ) {
 194                         $this->mOldId = $this->getOldIDFromRequest();
 195                 }
 196
 197                 return $this->mOldId;
 198         }
 199
 200         /**
 201          * Sets $this->mRedirectUrl to a correct URL if the query parameters are incorrect
 202          *
 203          * @return int The old id for the request
 204          */
 205         public function getOldIDFromRequest() {
 206                 global $wgRequest;
 207
 208                 $this->mRedirectUrl = false;
 209
 210                 $oldid = $wgRequest->getVal( 'oldid' );
 211
 212                 if ( isset( $oldid ) ) {
 213                         $oldid = intval( $oldid );
 214                         if ( $wgRequest->getVal( 'direction' ) == 'next' ) {
 215                                 $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 216                                 if ( $nextid ) {
 217                                         $oldid = $nextid;
 218                                 } else {
 219                                         $this->mRedirectUrl = $this->getTitle()->getFullURL( 'redirect=no' );
 220                                 }
 221                         } elseif ( $wgRequest->getVal( 'direction' ) == 'prev' ) {
 222                                 $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 223                                 if ( $previd ) {
 224                                         $oldid = $previd;
 225                                 }
 226                         }
 227                 }
 228
 229                 if ( !$oldid ) {
 230                         $oldid = 0;
 231                 }
 232
 233                 return $oldid;
 234         }
 235
 236         /**
 237          * Load the revision (including text) into this object
 238          */
 239         function loadContent() {
 240                 if ( $this->mContentLoaded ) {
 241                         return;
 242                 }
 243
 244                 wfProfileIn( __METHOD__ );
 245
 246                 $this->fetchContent( $this->getOldID() );
 247
 248                 wfProfileOut( __METHOD__ );
 249         }
 250
 251         /**
 252          * Get text of an article from database
 253          * Does *NOT* follow redirects.
 254          *
 255          * @param $oldid Int: 0 for whatever the latest revision is
 256          * @return mixed string containing article contents, or false if null
 257          */
 258         function fetchContent( $oldid = 0 ) {
 259                 if ( $this->mContentLoaded ) {
 260                         return $this->mContent;
 261                 }
 262
 263                 # Pre-fill content with error message so that if something
 264                 # fails we'll have something telling us what we intended.
 265                 $t = $this->getTitle()->getPrefixedText();
 266                 $d = $oldid ? wfMsgExt( 'missingarticle-rev', array( 'escape' ), $oldid ) : '';
 267                 $this->mContent = wfMsgNoTrans( 'missing-article', $t, $d ) ;
 268
 269                 if ( $oldid ) {
 270                         $revision = Revision::newFromId( $oldid );
 271                         if ( !$revision ) {
 272                                 wfDebug( __METHOD__ . " failed to retrieve specified revision, id $oldid\n" );
 273                                 return false;
 274                         }
 275                         // Revision title doesn't match the page title given?
 276                         if ( $this->mPage->getID() != $revision->getPage() ) {
 277                                 $function = array( get_class( $this->mPage ), 'newFromID' );
 278                                 $this->mPage = call_user_func( $function, $revision->getPage() );
 279                                 if ( !$this->mPage->getId() ) {
 280                                         wfDebug( __METHOD__ . " failed to get page data linked to revision id $oldid\n" );
 281                                         return false;
 282                                 }
 283                         }
 284                 } else {
 285                         if ( !$this->mPage->getLatest() ) {
 286                                 wfDebug( __METHOD__ . " failed to find page data for title " . $this->getTitle()->getPrefixedText() . "\n" );
 287                                 return false;
 288                         }
 289
 290                         $revision = $this->mPage->getRevision();
 291                         if ( !$revision ) {
 292                                 wfDebug( __METHOD__ . " failed to retrieve current page, rev_id " . $this->mPage->getLatest() . "\n" );
 293                                 return false;
 294                         }
 295                 }
 296
 297                 // @todo FIXME: Horrible, horrible! This content-loading interface just plain sucks.
 298                 // We should instead work with the Revision object when we need it...
 299                 $this->mContent   = $revision->getText( Revision::FOR_THIS_USER ); // Loads if user is allowed
 300
 301                 $this->mRevIdFetched = $revision->getId();
 302                 $this->mContentLoaded = true;
 303                 $this->mRevision =& $revision;
 304
 305                 wfRunHooks( 'ArticleAfterFetchContent', array( &$this, &$this->mContent ) );
 306
 307                 return $this->mContent;
 308         }
 309
 310         /**
 311          * No-op
 312          * @deprecated since 1.18
 313          */
 314         public function forUpdate() {
 315                 wfDeprecated( __METHOD__ );
 316         }
 317
 318         /**
 319          * Returns true if the currently-referenced revision is the current edit
 320          * to this page (and it exists).
 321          * @return bool
 322          */
 323         public function isCurrent() {
 324                 # If no oldid, this is the current version.
 325                 if ( $this->getOldID() == 0 ) {
 326                         return true;
 327                 }
 328
 329                 return $this->mPage->exists() && $this->mRevision && $this->mRevision->isCurrent();
 330         }
 331
 332         /**
 333          * Use this to fetch the rev ID used on page views
 334          *
 335          * @return int revision ID of last article revision
 336          */
 337         public function getRevIdFetched() {
 338                 if ( $this->mRevIdFetched ) {
 339                         return $this->mRevIdFetched;
 340                 } else {
 341                         return $this->mPage->getLatest();
 342                 }
 343         }
 344
 345         /**
 346          * This is the default action of the index.php entry point: just view the
 347          * page of the given title.
 348          */
 349         public function view() {
 350                 global $wgUser, $wgOut, $wgRequest, $wgParser;
 351                 global $wgUseFileCache, $wgUseETag;
 352
 353                 wfProfileIn( __METHOD__ );
 354
 355                 # Get variables from query string
 356                 $oldid = $this->getOldID();
 357
 358                 # getOldID may want us to redirect somewhere else
 359                 if ( $this->mRedirectUrl ) {
 360                         $wgOut->redirect( $this->mRedirectUrl );
 361                         wfDebug( __METHOD__ . ": redirecting due to oldid\n" );
 362                         wfProfileOut( __METHOD__ );
 363
 364                         return;
 365                 }
 366
 367                 $wgOut->setArticleFlag( true );
 368                 # Set page title (may be overridden by DISPLAYTITLE)
 369                 $wgOut->setPageTitle( $this->getTitle()->getPrefixedText() );
 370
 371                 # If we got diff in the query, we want to see a diff page instead of the article.
 372                 if ( $wgRequest->getCheck( 'diff' ) ) {
 373                         wfDebug( __METHOD__ . ": showing diff page\n" );
 374                         $this->showDiffPage();
 375                         wfProfileOut( __METHOD__ );
 376
 377                         return;
 378                 }
 379
 380                 # Allow frames by default
 381                 $wgOut->allowClickjacking();
 382
 383                 $parserCache = ParserCache::singleton();
 384
 385                 $parserOptions = $this->mPage->getParserOptions();
 386                 # Render printable version, use printable version cache
 387                 if ( $wgOut->isPrintable() ) {
 388                         $parserOptions->setIsPrintable( true );
 389                         $parserOptions->setEditSection( false );
 390                 } elseif ( $wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 391                         $parserOptions->setEditSection( false );
 392                 }
 393
 394                 # Try client and file cache
 395                 if ( $oldid === 0 && $this->mPage->checkTouched() ) {
 396                         if ( $wgUseETag ) {
 397                                 $wgOut->setETag( $parserCache->getETag( $this, $parserOptions ) );
 398                         }
 399
 400                         # Is it client cached?
 401                         if ( $wgOut->checkLastModified( $this->mPage->getTouched() ) ) {
 402                                 wfDebug( __METHOD__ . ": done 304\n" );
 403                                 wfProfileOut( __METHOD__ );
 404
 405                                 return;
 406                         # Try file cache
 407                         } elseif ( $wgUseFileCache && $this->tryFileCache() ) {
 408                                 wfDebug( __METHOD__ . ": done file cache\n" );
 409                                 # tell wgOut that output is taken care of
 410                                 $wgOut->disable();
 411                                 $this->mPage->viewUpdates();
 412                                 wfProfileOut( __METHOD__ );
 413
 414                                 return;
 415                         }
 416                 }
 417
 418                 if ( !$wgUseETag && !$this->getTitle()->quickUserCan( 'edit' ) ) {
 419                         $parserOptions->setEditSection( false );
 420                 }
 421
 422                 # Should the parser cache be used?
 423                 $useParserCache = $this->useParserCache( $oldid );
 424                 wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
 425                 if ( $wgUser->getStubThreshold() ) {
 426                         wfIncrStats( 'pcache_miss_stub' );
 427                 }
 428
 429                 $wasRedirected = $this->showRedirectedFromHeader();
 430                 $this->showNamespaceHeader();
 431
 432                 # Iterate through the possible ways of constructing the output text.
 433                 # Keep going until $outputDone is set, or we run out of things to do.
 434                 $pass = 0;
 435                 $outputDone = false;
 436                 $this->mParserOutput = false;
 437
 438                 while ( !$outputDone && ++$pass ) {
 439                         switch( $pass ) {
 440                                 case 1:
 441                                         wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
 442                                         break;
 443                                 case 2:
 444                                         # Try the parser cache
 445                                         if ( $useParserCache ) {
 446                                                 $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 447
 448                                                 if ( $this->mParserOutput !== false ) {
 449                                                         wfDebug( __METHOD__ . ": showing parser cache contents\n" );
 450                                                         $wgOut->addParserOutput( $this->mParserOutput );
 451                                                         # Ensure that UI elements requiring revision ID have
 452                                                         # the correct version information.
 453                                                         $wgOut->setRevisionId( $this->mPage->getLatest() );
 454                                                         $outputDone = true;
 455                                                         # Preload timestamp to avoid a DB hit
 456                                                         if ( isset( $this->mParserOutput->mTimestamp ) ) {
 457                                                                 $this->mPage->setTimestamp( $this->mParserOutput->mTimestamp );
 458                                                         }
 459                                                 }
 460                                         }
 461                                         break;
 462                                 case 3:
 463                                         $text = $this->getContent();
 464                                         if ( $text === false || $this->mPage->getID() == 0 ) {
 465                                                 wfDebug( __METHOD__ . ": showing missing article\n" );
 466                                                 $this->showMissingArticle();
 467                                                 wfProfileOut( __METHOD__ );
 468                                                 return;
 469                                         }
 470
 471                                         # Another whitelist check in case oldid is altering the title
 472                                         if ( !$this->getTitle()->userCanRead() ) {
 473                                                 wfDebug( __METHOD__ . ": denied on secondary read check\n" );
 474                                                 $wgOut->loginToUse();
 475                                                 $wgOut->output();
 476                                                 $wgOut->disable();
 477                                                 wfProfileOut( __METHOD__ );
 478                                                 return;
 479                                         }
 480
 481                                         # Are we looking at an old revision
 482                                         if ( $oldid && !is_null( $this->mRevision ) ) {
 483                                                 $this->setOldSubtitle( $oldid );
 484
 485                                                 if ( !$this->showDeletedRevisionHeader() ) {
 486                                                         wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
 487                                                         wfProfileOut( __METHOD__ );
 488                                                         return;
 489                                                 }
 490
 491                                                 # If this "old" version is the current, then try the parser cache...
 492                                                 if ( $oldid === $this->mPage->getLatest() && $this->useParserCache( false ) ) {
 493                                                         $this->mParserOutput = $parserCache->get( $this, $parserOptions );
 494                                                         if ( $this->mParserOutput ) {
 495                                                                 wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
 496                                                                 $wgOut->addParserOutput( $this->mParserOutput );
 497                                                                 $wgOut->setRevisionId( $this->mPage->getLatest() );
 498                                                                 $outputDone = true;
 499                                                                 break;
 500                                                         }
 501                                                 }
 502                                         }
 503
 504                                         # Ensure that UI elements requiring revision ID have
 505                                         # the correct version information.
 506                                         $wgOut->setRevisionId( $this->getRevIdFetched() );
 507
 508                                         # Pages containing custom CSS or JavaScript get special treatment
 509                                         if ( $this->getTitle()->isCssOrJsPage() || $this->getTitle()->isCssJsSubpage() ) {
 510                                                 wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
 511                                                 $this->showCssOrJsPage();
 512                                                 $outputDone = true;
 513                                         } else {
 514                                                 $rt = Title::newFromRedirectArray( $text );
 515                                                 if ( $rt ) {
 516                                                         wfDebug( __METHOD__ . ": showing redirect=no page\n" );
 517                                                         # Viewing a redirect page (e.g. with parameter redirect=no)
 518                                                         # Don't append the subtitle if this was an old revision
 519                                                         $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
 520                                                         # Parse just to get categories, displaytitle, etc.
 521                                                         $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(), $parserOptions );
 522                                                         $wgOut->addParserOutputNoText( $this->mParserOutput );
 523                                                         $outputDone = true;
 524                                                 }
 525                                         }
 526                                         break;
 527                                 case 4:
 528                                         # Run the parse, protected by a pool counter
 529                                         wfDebug( __METHOD__ . ": doing uncached parse\n" );
 530
 531                                         $key = $parserCache->getKey( $this, $parserOptions );
 532                                         $poolArticleView = new PoolWorkArticleView( $this, $key, $useParserCache, $parserOptions );
 533
 534                                         if ( !$poolArticleView->execute() ) {
 535                                                 # Connection or timeout error
 536                                                 wfProfileOut( __METHOD__ );
 537                                                 return;
 538                                         } else {
 539                                                 $outputDone = true;
 540                                         }
 541                                         break;
 542                                 # Should be unreachable, but just in case...
 543                                 default:
 544                                         break 2;
 545                         }
 546                 }
 547
 548                 # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
 549                 if ( $this->mParserOutput ) {
 550                         $titleText = $this->mParserOutput->getTitleText();
 551
 552                         if ( strval( $titleText ) !== '' ) {
 553                                 $wgOut->setPageTitle( $titleText );
 554                         }
 555                 }
 556
 557                 # For the main page, overwrite the <title> element with the con-
 558                 # tents of 'pagetitle-view-mainpage' instead of the default (if
 559                 # that's not empty).
 560                 # This message always exists because it is in the i18n files
 561                 if ( $this->getTitle()->equals( Title::newMainPage() ) ) {
 562                         $msg = wfMessage( 'pagetitle-view-mainpage' )->inContentLanguage();
 563                         if ( !$msg->isDisabled() ) {
 564                                 $wgOut->setHTMLTitle( $msg->title( $this->getTitle() )->text() );
 565                         }
 566                 }
 567
 568                 # Now that we've filled $this->mParserOutput, we know whether
 569                 # there are any __NOINDEX__ tags on the page
 570                 $policy = $this->getRobotPolicy( 'view' );
 571                 $wgOut->setIndexPolicy( $policy['index'] );
 572                 $wgOut->setFollowPolicy( $policy['follow'] );
 573
 574                 $this->showViewFooter();
 575                 $this->mPage->viewUpdates();
 576                 wfProfileOut( __METHOD__ );
 577         }
 578
 579         /**
 580          * Show a diff page according to current request variables. For use within
 581          * Article::view() only, other callers should use the DifferenceEngine class.
 582          */
 583         public function showDiffPage() {
 584                 global $wgRequest, $wgUser;
 585
 586                 $diff = $wgRequest->getVal( 'diff' );
 587                 $rcid = $wgRequest->getVal( 'rcid' );
 588                 $diffOnly = $wgRequest->getBool( 'diffonly', $wgUser->getOption( 'diffonly' ) );
 589                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
 590                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
 591                 $oldid = $this->getOldID();
 592
 593                 $de = new DifferenceEngine( $this->getTitle(), $oldid, $diff, $rcid, $purge, $unhide );
 594                 // DifferenceEngine directly fetched the revision:
 595                 $this->mRevIdFetched = $de->mNewid;
 596                 $de->showDiffPage( $diffOnly );
 597
 598                 if ( $diff == 0 || $diff == $this->mPage->getLatest() ) {
 599                         # Run view updates for current revision only
 600                         $this->mPage->viewUpdates();
 601                 }
 602         }
 603
 604         /**
 605          * Show a page view for a page formatted as CSS or JavaScript. To be called by
 606          * Article::view() only.
 607          *
 608          * This is hooked by SyntaxHighlight_GeSHi to do syntax highlighting of these
 609          * page views.
 610          */
 611         protected function showCssOrJsPage() {
 612                 global $wgOut, $wgLang;
 613
 614                 $dir = $wgLang->getDir();
 615                 $lang = $wgLang->getCode();
 616
 617                 $wgOut->wrapWikiMsg( "<div id='mw-clearyourcache' lang='$lang' dir='$dir' class='mw-content-$dir'>\n$1\n</div>",
 618                         'clearyourcache' );
 619
 620                 // Give hooks a chance to customise the output
 621                 if ( wfRunHooks( 'ShowRawCssJs', array( $this->mContent, $this->getTitle(), $wgOut ) ) ) {
 622                         // Wrap the whole lot in a <pre> and don't parse
 623                         $m = array();
 624                         preg_match( '!\.(css|js)$!u', $this->getTitle()->getText(), $m );
 625                         $wgOut->addHTML( "<pre class=\"mw-code mw-{$m[1]}\" dir=\"ltr\">\n" );
 626                         $wgOut->addHTML( htmlspecialchars( $this->mContent ) );
 627                         $wgOut->addHTML( "\n</pre>\n" );
 628                 }
 629         }
 630
 631         /**
 632          * Get the robot policy to be used for the current view
 633          * @param $action String the action= GET parameter
 634          * @return Array the policy that should be set
 635          * TODO: actions other than 'view'
 636          */
 637         public function getRobotPolicy( $action ) {
 638                 global $wgOut, $wgArticleRobotPolicies, $wgNamespaceRobotPolicies;
 639                 global $wgDefaultRobotPolicy, $wgRequest;
 640
 641                 $ns = $this->getTitle()->getNamespace();
 642
 643                 if ( $ns == NS_USER || $ns == NS_USER_TALK ) {
 644                         # Don't index user and user talk pages for blocked users (bug 11443)
 645                         if ( !$this->getTitle()->isSubpage() ) {
 646                                 if ( Block::newFromTarget( null, $this->getTitle()->getText() ) instanceof Block ) {
 647                                         return array(
 648                                                 'index'  => 'noindex',
 649                                                 'follow' => 'nofollow'
 650                                         );
 651                                 }
 652                         }
 653                 }
 654
 655                 if ( $this->mPage->getID() === 0 || $this->getOldID() ) {
 656                         # Non-articles (special pages etc), and old revisions
 657                         return array(
 658                                 'index'  => 'noindex',
 659                                 'follow' => 'nofollow'
 660                         );
 661                 } elseif ( $wgOut->isPrintable() ) {
 662                         # Discourage indexing of printable versions, but encourage following
 663                         return array(
 664                                 'index'  => 'noindex',
 665                                 'follow' => 'follow'
 666                         );
 667                 } elseif ( $wgRequest->getInt( 'curid' ) ) {
 668                         # For ?curid=x urls, disallow indexing
 669                         return array(
 670                                 'index'  => 'noindex',
 671                                 'follow' => 'follow'
 672                         );
 673                 }
 674
 675                 # Otherwise, construct the policy based on the various config variables.
 676                 $policy = self::formatRobotPolicy( $wgDefaultRobotPolicy );
 677
 678                 if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
 679                         # Honour customised robot policies for this namespace
 680                         $policy = array_merge(
 681                                 $policy,
 682                                 self::formatRobotPolicy( $wgNamespaceRobotPolicies[$ns] )
 683                         );
 684                 }
 685                 if ( $this->getTitle()->canUseNoindex() && is_object( $this->mParserOutput ) && $this->mParserOutput->getIndexPolicy() ) {
 686                         # __INDEX__ and __NOINDEX__ magic words, if allowed. Incorporates
 687                         # a final sanity check that we have really got the parser output.
 688                         $policy = array_merge(
 689                                 $policy,
 690                                 array( 'index' => $this->mParserOutput->getIndexPolicy() )
 691                         );
 692                 }
 693
 694                 if ( isset( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] ) ) {
 695                         # (bug 14900) site config can override user-defined __INDEX__ or __NOINDEX__
 696                         $policy = array_merge(
 697                                 $policy,
 698                                 self::formatRobotPolicy( $wgArticleRobotPolicies[$this->getTitle()->getPrefixedText()] )
 699                         );
 700                 }
 701
 702                 return $policy;
 703         }
 704
 705         /**
 706          * Converts a String robot policy into an associative array, to allow
 707          * merging of several policies using array_merge().
 708          * @param $policy Mixed, returns empty array on null/false/'', transparent
 709          *            to already-converted arrays, converts String.
 710          * @return Array: 'index' => <indexpolicy>, 'follow' => <followpolicy>
 711          */
 712         public static function formatRobotPolicy( $policy ) {
 713                 if ( is_array( $policy ) ) {
 714                         return $policy;
 715                 } elseif ( !$policy ) {
 716                         return array();
 717                 }
 718
 719                 $policy = explode( ',', $policy );
 720                 $policy = array_map( 'trim', $policy );
 721
 722                 $arr = array();
 723                 foreach ( $policy as $var ) {
 724                         if ( in_array( $var, array( 'index', 'noindex' ) ) ) {
 725                                 $arr['index'] = $var;
 726                         } elseif ( in_array( $var, array( 'follow', 'nofollow' ) ) ) {
 727                                 $arr['follow'] = $var;
 728                         }
 729                 }
 730
 731                 return $arr;
 732         }
 733
 734         /**
 735          * If this request is a redirect view, send "redirected from" subtitle to
 736          * $wgOut. Returns true if the header was needed, false if this is not a
 737          * redirect view. Handles both local and remote redirects.
 738          *
 739          * @return boolean
 740          */
 741         public function showRedirectedFromHeader() {
 742                 global $wgOut, $wgRequest, $wgRedirectSources;
 743
 744                 $rdfrom = $wgRequest->getVal( 'rdfrom' );
 745
 746                 if ( isset( $this->mRedirectedFrom ) ) {
 747                         // This is an internally redirected page view.
 748                         // We'll need a backlink to the source page for navigation.
 749                         if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
 750                                 $redir = Linker::link(
 751                                         $this->mRedirectedFrom,
 752                                         null,
 753                                         array(),
 754                                         array( 'redirect' => 'no' ),
 755                                         array( 'known', 'noclasses' )
 756                                 );
 757
 758                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 759                                 $wgOut->setSubtitle( $s );
 760
 761                                 // Set the fragment if one was specified in the redirect
 762                                 if ( strval( $this->getTitle()->getFragment() ) != '' ) {
 763                                         $fragment = Xml::escapeJsString( $this->getTitle()->getFragmentForURL() );
 764                                         $wgOut->addInlineScript( "redirectToFragment(\"$fragment\");" );
 765                                 }
 766
 767                                 // Add a <link rel="canonical"> tag
 768                                 $wgOut->addLink( array( 'rel' => 'canonical',
 769                                         'href' => $this->getTitle()->getLocalURL() )
 770                                 );
 771
 772                                 return true;
 773                         }
 774                 } elseif ( $rdfrom ) {
 775                         // This is an externally redirected view, from some other wiki.
 776                         // If it was reported from a trusted site, supply a backlink.
 777                         if ( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
 778                                 $redir = Linker::makeExternalLink( $rdfrom, $rdfrom );
 779                                 $s = wfMsgExt( 'redirectedfrom', array( 'parseinline', 'replaceafter' ), $redir );
 780                                 $wgOut->setSubtitle( $s );
 781
 782                                 return true;
 783                         }
 784                 }
 785
 786                 return false;
 787         }
 788
 789         /**
 790          * Show a header specific to the namespace currently being viewed, like
 791          * [[MediaWiki:Talkpagetext]]. For Article::view().
 792          */
 793         public function showNamespaceHeader() {
 794                 global $wgOut;
 795
 796                 if ( $this->getTitle()->isTalkPage() ) {
 797                         if ( !wfMessage( 'talkpageheader' )->isDisabled() ) {
 798                                 $wgOut->wrapWikiMsg( "<div class=\"mw-talkpageheader\">\n$1\n</div>", array( 'talkpageheader' ) );
 799                         }
 800                 }
 801         }
 802
 803         /**
 804          * Show the footer section of an ordinary page view
 805          */
 806         public function showViewFooter() {
 807                 global $wgOut, $wgUseTrackbacks;
 808
 809                 # check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
 810                 if ( $this->getTitle()->getNamespace() == NS_USER_TALK && IP::isValid( $this->getTitle()->getText() ) ) {
 811                         $wgOut->addWikiMsg( 'anontalkpagetext' );
 812                 }
 813
 814                 # If we have been passed an &rcid= parameter, we want to give the user a
 815                 # chance to mark this new article as patrolled.
 816                 $this->showPatrolFooter();
 817
 818                 # Trackbacks
 819                 if ( $wgUseTrackbacks ) {
 820                         $this->addTrackbacks();
 821                 }
 822
 823                 wfRunHooks( 'ArticleViewFooter', array( $this ) );
 824
 825         }
 826
 827         /**
 828          * If patrol is possible, output a patrol UI box. This is called from the
 829          * footer section of ordinary page views. If patrol is not possible or not
 830          * desired, does nothing.
 831          */
 832         public function showPatrolFooter() {
 833                 global $wgOut, $wgRequest, $wgUser;
 834
 835                 $rcid = $wgRequest->getVal( 'rcid' );
 836
 837                 if ( !$rcid || !$this->getTitle()->quickUserCan( 'patrol' ) ) {
 838                         return;
 839                 }
 840
 841                 $token = $wgUser->editToken( $rcid );
 842                 $wgOut->preventClickjacking();
 843
 844                 $wgOut->addHTML(
 845                         "<div class='patrollink'>" .
 846                                 wfMsgHtml(
 847                                         'markaspatrolledlink',
 848                                         Linker::link(
 849                                                 $this->getTitle(),
 850                                                 wfMsgHtml( 'markaspatrolledtext' ),
 851                                                 array(),
 852                                                 array(
 853                                                         'action' => 'markpatrolled',
 854                                                         'rcid' => $rcid,
 855                                                         'token' => $token,
 856                                                 ),
 857                                                 array( 'known', 'noclasses' )
 858                                         )
 859                                 ) .
 860                         '</div>'
 861                 );
 862         }
 863
 864         /**
 865          * Show the error text for a missing article. For articles in the MediaWiki
 866          * namespace, show the default message text. To be called from Article::view().
 867          */
 868         public function showMissingArticle() {
 869                 global $wgOut, $wgRequest, $wgUser;
 870
 871                 # Show info in user (talk) namespace. Does the user exist? Is he blocked?
 872                 if ( $this->getTitle()->getNamespace() == NS_USER || $this->getTitle()->getNamespace() == NS_USER_TALK ) {
 873                         $parts = explode( '/', $this->getTitle()->getText() );
 874                         $rootPart = $parts[0];
 875                         $user = User::newFromName( $rootPart, false /* allow IP users*/ );
 876                         $ip = User::isIP( $rootPart );
 877
 878                         if ( !$user->isLoggedIn() && !$ip ) { # User does not exist
 879                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n\$1\n</div>",
 880                                         array( 'userpage-userdoesnotexist-view', wfEscapeWikiText( $rootPart ) ) );
 881                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
 882                                 LogEventsList::showLogExtract(
 883                                         $wgOut,
 884                                         'block',
 885                                         $user->getUserPage()->getPrefixedText(),
 886                                         '',
 887                                         array(
 888                                                 'lim' => 1,
 889                                                 'showIfEmpty' => false,
 890                                                 'msgKey' => array(
 891                                                         'blocked-notice-logextract',
 892                                                         $user->getName() # Support GENDER in notice
 893                                                 )
 894                                         )
 895                                 );
 896                         }
 897                 }
 898
 899                 wfRunHooks( 'ShowMissingArticle', array( $this ) );
 900
 901                 # Show delete and move logs
 902                 LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->getTitle()->getPrefixedText(), '',
 903                         array(  'lim' => 10,
 904                                 'conds' => array( "log_action != 'revision'" ),
 905                                 'showIfEmpty' => false,
 906                                 'msgKey' => array( 'moveddeleted-notice' ) )
 907                 );
 908
 909                 # Show error message
 910                 $oldid = $this->getOldID();
 911                 if ( $oldid ) {
 912                         $text = wfMsgNoTrans( 'missing-article',
 913                                 $this->getTitle()->getPrefixedText(),
 914                                 wfMsgNoTrans( 'missingarticle-rev', $oldid ) );
 915                 } elseif ( $this->getTitle()->getNamespace() === NS_MEDIAWIKI ) {
 916                         // Use the default message text
 917                         $text = $this->getTitle()->getDefaultMessageText();
 918                 } else {
 919                         $createErrors = $this->getTitle()->getUserPermissionsErrors( 'create', $wgUser );
 920                         $editErrors = $this->getTitle()->getUserPermissionsErrors( 'edit', $wgUser );
 921                         $errors = array_merge( $createErrors, $editErrors );
 922
 923                         if ( !count( $errors ) ) {
 924                                 $text = wfMsgNoTrans( 'noarticletext' );
 925                         } else {
 926                                 $text = wfMsgNoTrans( 'noarticletext-nopermission' );
 927                         }
 928                 }
 929                 $text = "<div class='noarticletext'>\n$text\n</div>";
 930
 931                 if ( !$this->mPage->hasViewableContent() ) {
 932                         // If there's no backing content, send a 404 Not Found
 933                         // for better machine handling of broken links.
 934                         $wgRequest->response()->header( "HTTP/1.1 404 Not Found" );
 935                 }
 936
 937                 $wgOut->addWikiText( $text );
 938         }
 939
 940         /**
 941          * If the revision requested for view is deleted, check permissions.
 942          * Send either an error message or a warning header to $wgOut.
 943          *
 944          * @return boolean true if the view is allowed, false if not.
 945          */
 946         public function showDeletedRevisionHeader() {
 947                 global $wgOut, $wgRequest;
 948
 949                 if ( !$this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
 950                         // Not deleted
 951                         return true;
 952                 }
 953
 954                 // If the user is not allowed to see it...
 955                 if ( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
 956                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 957                                 'rev-deleted-text-permission' );
 958
 959                         return false;
 960                 // If the user needs to confirm that they want to see it...
 961                 } elseif ( $wgRequest->getInt( 'unhide' ) != 1 ) {
 962                         # Give explanation and add a link to view the revision...
 963                         $oldid = intval( $this->getOldID() );
 964                         $link = $this->getTitle()->getFullUrl( "oldid={$oldid}&unhide=1" );
 965                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 966                                 'rev-suppressed-text-unhide' : 'rev-deleted-text-unhide';
 967                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
 968                                 array( $msg, $link ) );
 969
 970                         return false;
 971                 // We are allowed to see...
 972                 } else {
 973                         $msg = $this->mRevision->isDeleted( Revision::DELETED_RESTRICTED ) ?
 974                                 'rev-suppressed-text-view' : 'rev-deleted-text-view';
 975                         $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", $msg );
 976
 977                         return true;
 978                 }
 979         }
 980
 981         /**
 982          * Execute the uncached parse for action=view
 983          */
 984         public function doViewParse() {
 985                 global $wgOut;
 986
 987                 $oldid = $this->getOldID();
 988                 $parserOptions = $this->mPage->getParserOptions();
 989
 990                 # Render printable version, use printable version cache
 991                 $parserOptions->setIsPrintable( $wgOut->isPrintable() );
 992
 993                 # Don't show section-edit links on old revisions... this way lies madness.
 994                 if ( !$this->isCurrent() || $wgOut->isPrintable() || !$this->getTitle()->quickUserCan( 'edit' ) ) {
 995                         $parserOptions->setEditSection( false );
 996                 }
 997
 998                 $useParserCache = $this->useParserCache( $oldid );
 999                 $this->outputWikiText( $this->getContent(), $useParserCache, $parserOptions );
1000
1001                 return true;
1002         }
1003
1004         /**
1005          * Try to fetch an expired entry from the parser cache. If it is present,
1006          * output it and return true. If it is not present, output nothing and
1007          * return false. This is used as a callback function for
1008          * PoolCounter::executeProtected().
1009          *
1010          * @return boolean
1011          */
1012         public function tryDirtyCache() {
1013                 global $wgOut;
1014                 $parserCache = ParserCache::singleton();
1015                 $options = $this->mPage->getParserOptions();
1016
1017                 if ( $wgOut->isPrintable() ) {
1018                         $options->setIsPrintable( true );
1019                         $options->setEditSection( false );
1020                 }
1021
1022                 $output = $parserCache->getDirty( $this, $options );
1023
1024                 if ( $output ) {
1025                         wfDebug( __METHOD__ . ": sending dirty output\n" );
1026                         wfDebugLog( 'dirty', "dirty output " . $parserCache->getKey( $this, $options ) . "\n" );
1027                         $wgOut->setSquidMaxage( 0 );
1028                         $this->mParserOutput = $output;
1029                         $wgOut->addParserOutput( $output );
1030                         $wgOut->addHTML( "<!-- parser cache is expired, sending anyway due to pool overload-->\n" );
1031
1032                         return true;
1033                 } else {
1034                         wfDebugLog( 'dirty', "dirty missing\n" );
1035                         wfDebug( __METHOD__ . ": no dirty cache\n" );
1036
1037                         return false;
1038                 }
1039         }
1040
1041         /**
1042          * View redirect
1043          *
1044          * @param $target Title|Array of destination(s) to redirect
1045          * @param $appendSubtitle Boolean [optional]
1046          * @param $forceKnown Boolean: should the image be shown as a bluelink regardless of existence?
1047          * @return string containing HMTL with redirect link
1048          */
1049         public function viewRedirect( $target, $appendSubtitle = true, $forceKnown = false ) {
1050                 global $wgOut, $wgLang, $wgStylePath;
1051
1052                 if ( !is_array( $target ) ) {
1053                         $target = array( $target );
1054                 }
1055
1056                 $imageDir = $wgLang->getDir();
1057
1058                 if ( $appendSubtitle ) {
1059                         $wgOut->appendSubtitle( wfMsgHtml( 'redirectpagesub' ) );
1060                 }
1061
1062                 // the loop prepends the arrow image before the link, so the first case needs to be outside
1063                 $title = array_shift( $target );
1064
1065                 if ( $forceKnown ) {
1066                         $link = Linker::linkKnown( $title, htmlspecialchars( $title->getFullText() ) );
1067                 } else {
1068                         $link = Linker::link( $title, htmlspecialchars( $title->getFullText() ) );
1069                 }
1070
1071                 $nextRedirect = $wgStylePath . '/common/images/nextredirect' . $imageDir . '.png';
1072                 $alt = $wgLang->isRTL() ? '←' : '→';
1073                 // Automatically append redirect=no to each link, since most of them are redirect pages themselves.
1074                 foreach ( $target as $rt ) {
1075                         $link .= Html::element( 'img', array( 'src' => $nextRedirect, 'alt' => $alt ) );
1076                         if ( $forceKnown ) {
1077                                 $link .= Linker::linkKnown( $rt, htmlspecialchars( $rt->getFullText(), array(), array( 'redirect' => 'no' ) ) );
1078                         } else {
1079                                 $link .= Linker::link( $rt, htmlspecialchars( $rt->getFullText() ), array(), array( 'redirect' => 'no' ) );
1080                         }
1081                 }
1082
1083                 $imageUrl = $wgStylePath . '/common/images/redirect' . $imageDir . '.png';
1084                 return '<div class="redirectMsg">' .
1085                         Html::element( 'img', array( 'src' => $imageUrl, 'alt' => '#REDIRECT' ) ) .
1086                         '<span class="redirectText">' . $link . '</span></div>';
1087         }
1088
1089         /**
1090          * Builds trackback links for article display if $wgUseTrackbacks is set to true
1091          */
1092         public function addTrackbacks() {
1093                 global $wgOut;
1094
1095                 $dbr = wfGetDB( DB_SLAVE );
1096                 $tbs = $dbr->select( 'trackbacks',
1097                         array( 'tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name' ),
1098                         array( 'tb_page' => $this->mPage->getID() )
1099                 );
1100
1101                 if ( !$dbr->numRows( $tbs ) ) {
1102                         return;
1103                 }
1104
1105                 $wgOut->preventClickjacking();
1106
1107                 $tbtext = "";
1108                 foreach ( $tbs as $o ) {
1109                         $rmvtxt = "";
1110
1111                         if ( $this->getContext()->getUser()->isAllowed( 'trackback' ) ) {
1112                                 $delurl = $this->getTitle()->getFullURL( "action=deletetrackback&tbid=" .
1113                                         $o->tb_id . "&token=" . urlencode( $this->getContext()->getUser()->editToken() ) );
1114                                 $rmvtxt = wfMsg( 'trackbackremove', htmlspecialchars( $delurl ) );
1115                         }
1116
1117                         $tbtext .= "\n";
1118                         $tbtext .= wfMsgNoTrans( strlen( $o->tb_ex ) ? 'trackbackexcerpt' : 'trackback',
1119                                         $o->tb_title,
1120                                         $o->tb_url,
1121                                         $o->tb_ex,
1122                                         $o->tb_name,
1123                                         $rmvtxt );
1124                 }
1125
1126                 $wgOut->wrapWikiMsg( "<div id='mw_trackbacks'>\n$1\n</div>\n", array( 'trackbackbox', $tbtext ) );
1127         }
1128
1129         /**
1130          * Removes trackback record for current article from trackbacks table
1131          * @deprecated since 1.19
1132          */
1133         public function deletetrackback() {
1134                 return Action::factory( 'deletetrackback', $this )->show();
1135         }
1136
1137         /**
1138          * Handle action=render
1139          */
1140
1141         public function render() {
1142                 global $wgOut;
1143
1144                 $wgOut->setArticleBodyOnly( true );
1145                 $this->view();
1146         }
1147
1148         /**
1149          * Handle action=purge
1150          */
1151         public function purge() {
1152                 return Action::factory( 'purge', $this )->show();
1153         }
1154
1155         /**
1156          * Mark this particular edit/page as patrolled
1157          * @deprecated since 1.19
1158          */
1159         public function markpatrolled() {
1160                 Action::factory( 'markpatrolled', $this )->show();
1161         }
1162
1163         /**
1164          * User-interface handler for the "watch" action.
1165          * Requires Request to pass a token as of 1.19.
1166          * @deprecated since 1.18
1167          */
1168         public function watch() {
1169                 Action::factory( 'watch', $this )->show();
1170         }
1171
1172         /**
1173          * Add this page to $wgUser's watchlist
1174          *
1175          * This is safe to be called multiple times
1176          *
1177          * @return bool true on successful watch operation
1178          * @deprecated since 1.18
1179          */
1180         public function doWatch() {
1181                 global $wgUser;
1182                 return WatchAction::doWatch( $this->getTitle(), $wgUser );
1183         }
1184
1185         /**
1186          * User interface handler for the "unwatch" action.
1187          * Requires Request to pass a token as of 1.19.
1188          * @deprecated since 1.18
1189          */
1190         public function unwatch() {
1191                 Action::factory( 'unwatch', $this )->show();
1192         }
1193
1194         /**
1195          * Stop watching a page
1196          * @return bool true on successful unwatch
1197          * @deprecated since 1.18
1198          */
1199         public function doUnwatch() {
1200                 global $wgUser;
1201                 return WatchAction::doUnwatch( $this->getTitle(), $wgUser );
1202         }
1203
1204         /**
1205          * action=protect handler
1206          */
1207         public function protect() {
1208                 $form = new ProtectionForm( $this );
1209                 $form->execute();
1210         }
1211
1212         /**
1213          * action=unprotect handler (alias)
1214          */
1215         public function unprotect() {
1216                 $this->protect();
1217         }
1218
1219         /**
1220          * Info about this page
1221          * Called for ?action=info when $wgAllowPageInfo is on.
1222          */
1223         public function info() {
1224                 Action::factory( 'info', $this )->show();
1225         }
1226
1227         /**
1228          * Overriden by ImagePage class, only present here to avoid a fatal error
1229          * Called for ?action=revert
1230          */
1231         public function revert() {
1232                 Action::factory( 'revert', $this )->show();
1233         }
1234
1235         /**
1236          * User interface for rollback operations
1237          */
1238         public function rollback() {
1239                 Action::factory( 'rollback', $this )->show();
1240         }
1241
1242         /**
1243          * Output a redirect back to the article.
1244          * This is typically used after an edit.
1245          *
1246          * @deprecated in 1.19; call $wgOut->redirect() directly
1247          * @param $noRedir Boolean: add redirect=no
1248          * @param $sectionAnchor String: section to redirect to, including "#"
1249          * @param $extraQuery String: extra query params
1250          */
1251         public function doRedirect( $noRedir = false, $sectionAnchor = '', $extraQuery = '' ) {
1252                 wfDeprecated( __METHOD__ );
1253                 global $wgOut;
1254
1255                 if ( $noRedir ) {
1256                         $query = 'redirect=no';
1257                         if ( $extraQuery )
1258                                 $query .= "&$extraQuery";
1259                 } else {
1260                         $query = $extraQuery;
1261                 }
1262
1263                 $wgOut->redirect( $this->getTitle()->getFullURL( $query ) . $sectionAnchor );
1264         }
1265
1266         /**
1267          * Auto-generates a deletion reason
1268          *
1269          * @param &$hasHistory Boolean: whether the page has a history
1270          * @return mixed String containing deletion reason or empty string, or boolean false
1271          *    if no revision occurred
1272          */
1273         public function generateReason( &$hasHistory ) {
1274                 global $wgContLang;
1275
1276                 $dbw = wfGetDB( DB_MASTER );
1277                 // Get the last revision
1278                 $rev = Revision::newFromTitle( $this->getTitle() );
1279
1280                 if ( is_null( $rev ) ) {
1281                         return false;
1282                 }
1283
1284                 // Get the article's contents
1285                 $contents = $rev->getText();
1286                 $blank = false;
1287
1288                 // If the page is blank, use the text from the previous revision,
1289                 // which can only be blank if there's a move/import/protect dummy revision involved
1290                 if ( $contents == '' ) {
1291                         $prev = $rev->getPrevious();
1292
1293                         if ( $prev )    {
1294                                 $contents = $prev->getText();
1295                                 $blank = true;
1296                         }
1297                 }
1298
1299                 // Find out if there was only one contributor
1300                 // Only scan the last 20 revisions
1301                 $res = $dbw->select( 'revision', 'rev_user_text',
1302                         array( 'rev_page' => $this->mPage->getID(), $dbw->bitAnd( 'rev_deleted', Revision::DELETED_USER ) . ' = 0' ),
1303                         __METHOD__,
1304                         array( 'LIMIT' => 20 )
1305                 );
1306
1307                 if ( $res === false ) {
1308                         // This page has no revisions, which is very weird
1309                         return false;
1310                 }
1311
1312                 $hasHistory = ( $res->numRows() > 1 );
1313                 $row = $dbw->fetchObject( $res );
1314
1315                 if ( $row ) { // $row is false if the only contributor is hidden
1316                         $onlyAuthor = $row->rev_user_text;
1317                         // Try to find a second contributor
1318                         foreach ( $res as $row ) {
1319                                 if ( $row->rev_user_text != $onlyAuthor ) { // Bug 22999
1320                                         $onlyAuthor = false;
1321                                         break;
1322                                 }
1323                         }
1324                 } else {
1325                         $onlyAuthor = false;
1326                 }
1327
1328                 // Generate the summary with a '$1' placeholder
1329                 if ( $blank ) {
1330                         // The current revision is blank and the one before is also
1331                         // blank. It's just not our lucky day
1332                         $reason = wfMsgForContent( 'exbeforeblank', '$1' );
1333                 } else {
1334                         if ( $onlyAuthor ) {
1335                                 $reason = wfMsgForContent( 'excontentauthor', '$1', $onlyAuthor );
1336                         } else {
1337                                 $reason = wfMsgForContent( 'excontent', '$1' );
1338                         }
1339                 }
1340
1341                 if ( $reason == '-' ) {
1342                         // Allow these UI messages to be blanked out cleanly
1343                         return '';
1344                 }
1345
1346                 // Replace newlines with spaces to prevent uglyness
1347                 $contents = preg_replace( "/[\n\r]/", ' ', $contents );
1348                 // Calculate the maximum amount of chars to get
1349                 // Max content length = max comment length - length of the comment (excl. $1)
1350                 $maxLength = 255 - ( strlen( $reason ) - 2 );
1351                 $contents = $wgContLang->truncate( $contents, $maxLength );
1352                 // Remove possible unfinished links
1353                 $contents = preg_replace( '/\[\[([^\]]*)\]?$/', '$1', $contents );
1354                 // Now replace the '$1' placeholder
1355                 $reason = str_replace( '$1', $contents, $reason );
1356
1357                 return $reason;
1358         }
1359
1360
1361         /**
1362          * UI entry point for page deletion
1363          */
1364         public function delete() {
1365                 global $wgOut, $wgRequest;
1366
1367                 $confirm = $wgRequest->wasPosted() &&
1368                                 $this->getContext()->getUser()->matchEditToken( $wgRequest->getVal( 'wpEditToken' ) );
1369
1370                 $this->DeleteReasonList = $wgRequest->getText( 'wpDeleteReasonList', 'other' );
1371                 $this->DeleteReason = $wgRequest->getText( 'wpReason' );
1372
1373                 $reason = $this->DeleteReasonList;
1374
1375                 if ( $reason != 'other' && $this->DeleteReason != '' ) {
1376                         // Entry from drop down menu + additional comment
1377                         $reason .= wfMsgForContent( 'colon-separator' ) . $this->DeleteReason;
1378                 } elseif ( $reason == 'other' ) {
1379                         $reason = $this->DeleteReason;
1380                 }
1381
1382                 # Flag to hide all contents of the archived revisions
1383                 $suppress = $wgRequest->getVal( 'wpSuppress' ) && $this->getContext()->getUser()->isAllowed( 'suppressrevision' );
1384
1385                 # This code desperately needs to be totally rewritten
1386
1387                 # Read-only check...
1388                 if ( wfReadOnly() ) {
1389                         $wgOut->readOnlyPage();
1390
1391                         return;
1392                 }
1393
1394                 # Check permissions
1395                 $permission_errors = $this->getTitle()->getUserPermissionsErrors( 'delete', $this->getContext()->getUser() );
1396
1397                 if ( count( $permission_errors ) > 0 ) {
1398                         $wgOut->showPermissionsErrorPage( $permission_errors );
1399
1400                         return;
1401                 }
1402
1403                 $wgOut->setPagetitle( wfMsg( 'delete-confirm', $this->getTitle()->getPrefixedText() ) );
1404
1405                 # Better double-check that it hasn't been deleted yet!
1406                 $dbw = wfGetDB( DB_MASTER );
1407                 $conds = $this->getTitle()->pageCond();
1408                 $latest = $dbw->selectField( 'page', 'page_latest', $conds, __METHOD__ );
1409                 if ( $latest === false ) {
1410                         $wgOut->showFatalError(
1411                                 Html::rawElement(
1412                                         'div',
1413                                         array( 'class' => 'error mw-error-cannotdelete' ),
1414                                         wfMsgExt( 'cannotdelete', array( 'parse' ),
1415                                                 wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1416                                 )
1417                         );
1418                         $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1419                         LogEventsList::showLogExtract(
1420                                 $wgOut,
1421                                 'delete',
1422                                 $this->getTitle()->getPrefixedText()
1423                         );
1424
1425                         return;
1426                 }
1427
1428                 # Hack for big sites
1429                 $bigHistory = $this->mPage->isBigDeletion();
1430                 if ( $bigHistory && !$this->getTitle()->userCan( 'bigdelete' ) ) {
1431                         global $wgLang, $wgDeleteRevisionsLimit;
1432
1433                         $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1434                                 array( 'delete-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1435
1436                         return;
1437                 }
1438
1439                 if ( $confirm ) {
1440                         $this->doDelete( $reason, $suppress );
1441
1442                         if ( $wgRequest->getCheck( 'wpWatch' ) && $this->getContext()->getUser()->isLoggedIn() ) {
1443                                 $this->doWatch();
1444                         } elseif ( $this->getTitle()->userIsWatching() ) {
1445                                 $this->doUnwatch();
1446                         }
1447
1448                         return;
1449                 }
1450
1451                 // Generate deletion reason
1452                 $hasHistory = false;
1453                 if ( !$reason ) {
1454                         $reason = $this->generateReason( $hasHistory );
1455                 }
1456
1457                 // If the page has a history, insert a warning
1458                 if ( $hasHistory && !$confirm ) {
1459                         global $wgLang;
1460
1461                         $revisions = $this->mPage->estimateRevisionCount();
1462                         // @todo FIXME: i18n issue/patchwork message
1463                         $wgOut->addHTML( '<strong class="mw-delete-warning-revisions">' .
1464                                 wfMsgExt( 'historywarning', array( 'parseinline' ), $wgLang->formatNum( $revisions ) ) .
1465                                 wfMsgHtml( 'word-separator' ) . Linker::link( $this->getTitle(),
1466                                         wfMsgHtml( 'history' ),
1467                                         array( 'rel' => 'archives' ),
1468                                         array( 'action' => 'history' ) ) .
1469                                 '</strong>'
1470                         );
1471
1472                         if ( $bigHistory ) {
1473                                 global $wgDeleteRevisionsLimit;
1474                                 $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>\n",
1475                                         array( 'delete-warning-toobig', $wgLang->formatNum( $wgDeleteRevisionsLimit ) ) );
1476                         }
1477                 }
1478
1479                 return $this->confirmDelete( $reason );
1480         }
1481
1482         /**
1483          * Output deletion confirmation dialog
1484          * @todo FIXME: Move to another file?
1485          * @param $reason String: prefilled reason
1486          */
1487         public function confirmDelete( $reason ) {
1488                 global $wgOut;
1489
1490                 wfDebug( "Article::confirmDelete\n" );
1491
1492                 $deleteBackLink = Linker::linkKnown( $this->getTitle() );
1493                 $wgOut->setSubtitle( wfMsgHtml( 'delete-backlink', $deleteBackLink ) );
1494                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1495                 $wgOut->addWikiMsg( 'confirmdeletetext' );
1496
1497                 wfRunHooks( 'ArticleConfirmDelete', array( $this, $wgOut, &$reason ) );
1498
1499                 if ( $this->getContext()->getUser()->isAllowed( 'suppressrevision' ) ) {
1500                         $suppress = "<tr id=\"wpDeleteSuppressRow\">
1501                                         <td></td>
1502                                         <td class='mw-input'><strong>" .
1503                                                 Xml::checkLabel( wfMsg( 'revdelete-suppress' ),
1504                                                         'wpSuppress', 'wpSuppress', false, array( 'tabindex' => '4' ) ) .
1505                                         "</strong></td>
1506                                 </tr>";
1507                 } else {
1508                         $suppress = '';
1509                 }
1510                 $checkWatch = $this->getContext()->getUser()->getBoolOption( 'watchdeletion' ) || $this->getTitle()->userIsWatching();
1511
1512                 $form = Xml::openElement( 'form', array( 'method' => 'post',
1513                         'action' => $this->getTitle()->getLocalURL( 'action=delete' ), 'id' => 'deleteconfirm' ) ) .
1514                         Xml::openElement( 'fieldset', array( 'id' => 'mw-delete-table' ) ) .
1515                         Xml::tags( 'legend', null, wfMsgExt( 'delete-legend', array( 'parsemag', 'escapenoentities' ) ) ) .
1516                         Xml::openElement( 'table', array( 'id' => 'mw-deleteconfirm-table' ) ) .
1517                         "<tr id=\"wpDeleteReasonListRow\">
1518                                 <td class='mw-label'>" .
1519                                         Xml::label( wfMsg( 'deletecomment' ), 'wpDeleteReasonList' ) .
1520                                 "</td>
1521                                 <td class='mw-input'>" .
1522                                         Xml::listDropDown( 'wpDeleteReasonList',
1523                                                 wfMsgForContent( 'deletereason-dropdown' ),
1524                                                 wfMsgForContent( 'deletereasonotherlist' ), '', 'wpReasonDropDown', 1 ) .
1525                                 "</td>
1526                         </tr>
1527                         <tr id=\"wpDeleteReasonRow\">
1528                                 <td class='mw-label'>" .
1529                                         Xml::label( wfMsg( 'deleteotherreason' ), 'wpReason' ) .
1530                                 "</td>
1531                                 <td class='mw-input'>" .
1532                                 Html::input( 'wpReason', $reason, 'text', array(
1533                                         'size' => '60',
1534                                         'maxlength' => '255',
1535                                         'tabindex' => '2',
1536                                         'id' => 'wpReason',
1537                                         'autofocus'
1538                                 ) ) .
1539                                 "</td>
1540                         </tr>";
1541
1542                 # Disallow watching if user is not logged in
1543                 if ( $this->getContext()->getUser()->isLoggedIn() ) {
1544                         $form .= "
1545                         <tr>
1546                                 <td></td>
1547                                 <td class='mw-input'>" .
1548                                         Xml::checkLabel( wfMsg( 'watchthis' ),
1549                                                 'wpWatch', 'wpWatch', $checkWatch, array( 'tabindex' => '3' ) ) .
1550                                 "</td>
1551                         </tr>";
1552                 }
1553
1554                 $form .= "
1555                         $suppress
1556                         <tr>
1557                                 <td></td>
1558                                 <td class='mw-submit'>" .
1559                                         Xml::submitButton( wfMsg( 'deletepage' ),
1560                                                 array( 'name' => 'wpConfirmB', 'id' => 'wpConfirmB', 'tabindex' => '5' ) ) .
1561                                 "</td>
1562                         </tr>" .
1563                         Xml::closeElement( 'table' ) .
1564                         Xml::closeElement( 'fieldset' ) .
1565                         Html::hidden( 'wpEditToken', $this->getContext()->getUser()->editToken() ) .
1566                         Xml::closeElement( 'form' );
1567
1568                         if ( $this->getContext()->getUser()->isAllowed( 'editinterface' ) ) {
1569                                 $title = Title::makeTitle( NS_MEDIAWIKI, 'Deletereason-dropdown' );
1570                                 $link = Linker::link(
1571                                         $title,
1572                                         wfMsgHtml( 'delete-edit-reasonlist' ),
1573                                         array(),
1574                                         array( 'action' => 'edit' )
1575                                 );
1576                                 $form .= '<p class="mw-delete-editreasons">' . $link . '</p>';
1577                         }
1578
1579                 $wgOut->addHTML( $form );
1580                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1581                 LogEventsList::showLogExtract( $wgOut, 'delete',
1582                         $this->getTitle()->getPrefixedText()
1583                 );
1584         }
1585
1586         /**
1587          * Perform a deletion and output success or failure messages
1588          */
1589         public function doDelete( $reason, $suppress = false ) {
1590                 global $wgOut;
1591
1592                 $id = $this->getTitle()->getArticleID( Title::GAID_FOR_UPDATE );
1593
1594                 $error = '';
1595                 if ( $this->mPage->doDeleteArticle( $reason, $suppress, $id, $error ) ) {
1596                         $deleted = $this->getTitle()->getPrefixedText();
1597
1598                         $wgOut->setPagetitle( wfMsg( 'actioncomplete' ) );
1599                         $wgOut->setRobotPolicy( 'noindex,nofollow' );
1600
1601                         $loglink = '[[Special:Log/delete|' . wfMsgNoTrans( 'deletionlog' ) . ']]';
1602
1603                         $wgOut->addWikiMsg( 'deletedtext', wfEscapeWikiText( $deleted ), $loglink );
1604                         $wgOut->returnToMain( false );
1605                 } else {
1606                         if ( $error == '' ) {
1607                                 $wgOut->showFatalError(
1608                                         Html::rawElement(
1609                                                 'div',
1610                                                 array( 'class' => 'error mw-error-cannotdelete' ),
1611                                                 wfMsgExt( 'cannotdelete', array( 'parse' ),
1612                                                         wfEscapeWikiText( $this->getTitle()->getPrefixedText() ) )
1613                                         )
1614                                 );
1615
1616                                 $wgOut->addHTML( Xml::element( 'h2', null, LogPage::logName( 'delete' ) ) );
1617
1618                                 LogEventsList::showLogExtract(
1619                                         $wgOut,
1620                                         'delete',
1621                                         $this->getTitle()->getPrefixedText()
1622                                 );
1623                         } else {
1624                                 $wgOut->showFatalError( $error );
1625                         }
1626                 }
1627         }
1628
1629         /**
1630          * Generate the navigation links when browsing through an article revisions
1631          * It shows the information as:
1632          *   Revision as of \<date\>; view current revision
1633          *   \<- Previous version | Next Version -\>
1634          *
1635          * @param $oldid String: revision ID of this article revision
1636          */
1637         public function setOldSubtitle( $oldid = 0 ) {
1638                 global $wgLang, $wgOut, $wgUser, $wgRequest;
1639
1640                 if ( !wfRunHooks( 'DisplayOldSubtitle', array( &$this, &$oldid ) ) ) {
1641                         return;
1642                 }
1643
1644                 $unhide = $wgRequest->getInt( 'unhide' ) == 1;
1645
1646                 # Cascade unhide param in links for easy deletion browsing
1647                 $extraParams = array();
1648                 if ( $wgRequest->getVal( 'unhide' ) ) {
1649                         $extraParams['unhide'] = 1;
1650                 }
1651
1652                 $revision = Revision::newFromId( $oldid );
1653                 $timestamp = $revision->getTimestamp();
1654
1655                 $current = ( $oldid == $this->mPage->getLatest() );
1656                 $td = $wgLang->timeanddate( $timestamp, true );
1657                 $tddate = $wgLang->date( $timestamp, true );
1658                 $tdtime = $wgLang->time( $timestamp, true );
1659
1660                 $lnk = $current
1661                         ? wfMsgHtml( 'currentrevisionlink' )
1662                         : Linker::link(
1663                                 $this->getTitle(),
1664                                 wfMsgHtml( 'currentrevisionlink' ),
1665                                 array(),
1666                                 $extraParams,
1667                                 array( 'known', 'noclasses' )
1668                         );
1669                 $curdiff = $current
1670                         ? wfMsgHtml( 'diff' )
1671                         : Linker::link(
1672                                 $this->getTitle(),
1673                                 wfMsgHtml( 'diff' ),
1674                                 array(),
1675                                 array(
1676                                         'diff' => 'cur',
1677                                         'oldid' => $oldid
1678                                 ) + $extraParams,
1679                                 array( 'known', 'noclasses' )
1680                         );
1681                 $prev = $this->getTitle()->getPreviousRevisionID( $oldid ) ;
1682                 $prevlink = $prev
1683                         ? Linker::link(
1684                                 $this->getTitle(),
1685                                 wfMsgHtml( 'previousrevision' ),
1686                                 array(),
1687                                 array(
1688                                         'direction' => 'prev',
1689                                         'oldid' => $oldid
1690                                 ) + $extraParams,
1691                                 array( 'known', 'noclasses' )
1692                         )
1693                         : wfMsgHtml( 'previousrevision' );
1694                 $prevdiff = $prev
1695                         ? Linker::link(
1696                                 $this->getTitle(),
1697                                 wfMsgHtml( 'diff' ),
1698                                 array(),
1699                                 array(
1700                                         'diff' => 'prev',
1701                                         'oldid' => $oldid
1702                                 ) + $extraParams,
1703                                 array( 'known', 'noclasses' )
1704                         )
1705                         : wfMsgHtml( 'diff' );
1706                 $nextlink = $current
1707                         ? wfMsgHtml( 'nextrevision' )
1708                         : Linker::link(
1709                                 $this->getTitle(),
1710                                 wfMsgHtml( 'nextrevision' ),
1711                                 array(),
1712                                 array(
1713                                         'direction' => 'next',
1714                                         'oldid' => $oldid
1715                                 ) + $extraParams,
1716                                 array( 'known', 'noclasses' )
1717                         );
1718                 $nextdiff = $current
1719                         ? wfMsgHtml( 'diff' )
1720                         : Linker::link(
1721                                 $this->getTitle(),
1722                                 wfMsgHtml( 'diff' ),
1723                                 array(),
1724                                 array(
1725                                         'diff' => 'next',
1726                                         'oldid' => $oldid
1727                                 ) + $extraParams,
1728                                 array( 'known', 'noclasses' )
1729                         );
1730
1731                 $cdel = '';
1732
1733                 // User can delete revisions or view deleted revisions...
1734                 $canHide = $wgUser->isAllowed( 'deleterevision' );
1735                 if ( $canHide || ( $revision->getVisibility() && $wgUser->isAllowed( 'deletedhistory' ) ) ) {
1736                         if ( !$revision->userCan( Revision::DELETED_RESTRICTED ) ) {
1737                                 $cdel = Linker::revDeleteLinkDisabled( $canHide ); // rev was hidden from Sysops
1738                         } else {
1739                                 $query = array(
1740                                         'type'   => 'revision',
1741                                         'target' => $this->getTitle()->getPrefixedDbkey(),
1742                                         'ids'    => $oldid
1743                                 );
1744                                 $cdel = Linker::revDeleteLink( $query, $revision->isDeleted( File::DELETED_RESTRICTED ), $canHide );
1745                         }
1746                         $cdel .= ' ';
1747                 }
1748
1749                 # Show user links if allowed to see them. If hidden, then show them only if requested...
1750                 $userlinks = Linker::revUserTools( $revision, !$unhide );
1751
1752                 $infomsg = $current && !wfMessage( 'revision-info-current' )->isDisabled()
1753                         ? 'revision-info-current'
1754                         : 'revision-info';
1755
1756                 $r = "\n\t\t\t\t<div id=\"mw-{$infomsg}\">" .
1757                         wfMsgExt(
1758                                 $infomsg,
1759                                 array( 'parseinline', 'replaceafter' ),
1760                                 $td,
1761                                 $userlinks,
1762                                 $revision->getID(),
1763                                 $tddate,
1764                                 $tdtime,
1765                                 $revision->getUser()
1766                         ) .
1767                         "</div>\n" .
1768                         "\n\t\t\t\t<div id=\"mw-revision-nav\">" . $cdel . wfMsgExt( 'revision-nav', array( 'escapenoentities', 'parsemag', 'replaceafter' ),
1769                         $prevdiff, $prevlink, $lnk, $curdiff, $nextlink, $nextdiff ) . "</div>\n\t\t\t";
1770
1771                 $wgOut->setSubtitle( $r );
1772         }
1773
1774         /* Caching functions */
1775
1776         /**
1777          * checkLastModified returns true if it has taken care of all
1778          * output to the client that is necessary for this request.
1779          * (that is, it has sent a cached version of the page)
1780          *
1781          * @return boolean true if cached version send, false otherwise
1782          */
1783         protected function tryFileCache() {
1784                 static $called = false;
1785
1786                 if ( $called ) {
1787                         wfDebug( "Article::tryFileCache(): called twice!?\n" );
1788                         return false;
1789                 }
1790
1791                 $called = true;
1792                 if ( $this->isFileCacheable() ) {
1793                         $cache = new HTMLFileCache( $this->getTitle() );
1794                         if ( $cache->isFileCacheGood( $this->mPage->getTouched() ) ) {
1795                                 wfDebug( "Article::tryFileCache(): about to load file\n" );
1796                                 $cache->loadFromFileCache();
1797                                 return true;
1798                         } else {
1799                                 wfDebug( "Article::tryFileCache(): starting buffer\n" );
1800                                 ob_start( array( &$cache, 'saveToFileCache' ) );
1801                         }
1802                 } else {
1803                         wfDebug( "Article::tryFileCache(): not cacheable\n" );
1804                 }
1805
1806                 return false;
1807         }
1808
1809         /**
1810          * Check if the page can be cached
1811          * @return bool
1812          */
1813         public function isFileCacheable() {
1814                 $cacheable = false;
1815
1816                 if ( HTMLFileCache::useFileCache() ) {
1817                         $cacheable = $this->mPage->getID() && !$this->mRedirectedFrom && !$this->getTitle()->isRedirect();
1818                         // Extension may have reason to disable file caching on some pages.
1819                         if ( $cacheable ) {
1820                                 $cacheable = wfRunHooks( 'IsFileCacheable', array( &$this ) );
1821                         }
1822                 }
1823
1824                 return $cacheable;
1825         }
1826
1827         /**#@-*/
1828
1829         /**
1830          * Add the primary page-view wikitext to the output buffer
1831          * Saves the text into the parser cache if possible.
1832          * Updates templatelinks if it is out of date.
1833          *
1834          * @param $text String
1835          * @param $cache Boolean
1836          * @param $parserOptions mixed ParserOptions object, or boolean false
1837          */
1838         public function outputWikiText( $text, $cache = true, $parserOptions = false ) {
1839                 global $wgOut;
1840
1841                 $this->mParserOutput = $this->getOutputFromWikitext( $text, $cache, $parserOptions );
1842
1843                 $this->doCascadeProtectionUpdates( $this->mParserOutput );
1844
1845                 $wgOut->addParserOutput( $this->mParserOutput );
1846         }
1847
1848         /**
1849          * Lightweight method to get the parser output for a page, checking the parser cache
1850          * and so on. Doesn't consider most of the stuff that WikiPage::view is forced to
1851          * consider, so it's not appropriate to use there.
1852          *
1853          * @since 1.16 (r52326) for LiquidThreads
1854          *
1855          * @param $oldid mixed integer Revision ID or null
1856          * @param $user User The relevant user
1857          * @return ParserOutput or false if the given revsion ID is not found
1858          */
1859         public function getParserOutput( $oldid = null, User $user = null ) {
1860                 global $wgEnableParserCache, $wgUser;
1861                 $user = is_null( $user ) ? $wgUser : $user;
1862
1863                 // Should the parser cache be used?
1864                 $useParserCache = $wgEnableParserCache &&
1865                         $user->getStubThreshold() == 0 &&
1866                         $this->mPage->exists() &&
1867                         $oldid === null;
1868
1869                 wfDebug( __METHOD__ . ': using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
1870
1871                 if ( $user->getStubThreshold() ) {
1872                         wfIncrStats( 'pcache_miss_stub' );
1873                 }
1874
1875                 if ( $useParserCache ) {
1876                         $parserOutput = ParserCache::singleton()->get( $this, $this->mPage->getParserOptions() );
1877                         if ( $parserOutput !== false ) {
1878                                 return $parserOutput;
1879                         }
1880                 }
1881
1882                 // Cache miss; parse and output it.
1883                 if ( $oldid === null ) {
1884                         $text = $this->mPage->getRawText();
1885                 } else {
1886                         $rev = Revision::newFromTitle( $this->getTitle(), $oldid );
1887                         if ( $rev === null ) {
1888                                 return false;
1889                         }
1890                         $text = $rev->getText();
1891                 }
1892
1893                 return $this->getOutputFromWikitext( $text, $useParserCache );
1894         }
1895
1896         /**
1897          * This does all the heavy lifting for outputWikitext, except it returns the parser
1898          * output instead of sending it straight to $wgOut. Makes things nice and simple for,
1899          * say, embedding thread pages within a discussion system (LiquidThreads)
1900          *
1901          * @param $text string
1902          * @param $cache boolean
1903          * @param $parserOptions parsing options, defaults to false
1904          * @return ParserOutput
1905          */
1906         public function getOutputFromWikitext( $text, $cache = true, $parserOptions = false ) {
1907                 global $wgParser, $wgEnableParserCache, $wgUseFileCache;
1908
1909                 if ( !$parserOptions ) {
1910                         $parserOptions = $this->mPage->getParserOptions();
1911                 }
1912
1913                 $time = - wfTime();
1914                 $this->mParserOutput = $wgParser->parse( $text, $this->getTitle(),
1915                         $parserOptions, true, true, $this->getRevIdFetched() );
1916                 $time += wfTime();
1917
1918                 # Timing hack
1919                 if ( $time > 3 ) {
1920                         wfDebugLog( 'slow-parse', sprintf( "%-5.2f %s", $time,
1921                                 $this->getTitle()->getPrefixedDBkey() ) );
1922                 }
1923
1924                 if ( $wgEnableParserCache && $cache && $this->mParserOutput->isCacheable() ) {
1925                         $parserCache = ParserCache::singleton();
1926                         $parserCache->save( $this->mParserOutput, $this, $parserOptions );
1927                 }
1928
1929                 // Make sure file cache is not used on uncacheable content.
1930                 // Output that has magic words in it can still use the parser cache
1931                 // (if enabled), though it will generally expire sooner.
1932                 if ( !$this->mParserOutput->isCacheable() || $this->mParserOutput->containsOldMagic() ) {
1933                         $wgUseFileCache = false;
1934                 }
1935
1936                 if ( $this->isCurrent() ) {
1937                         $this->mPage->doCascadeProtectionUpdates( $this->mParserOutput );
1938                 }
1939
1940                 return $this->mParserOutput;
1941         }
1942
1943         /**
1944          * Sets the context this Article is executed in
1945          *
1946          * @param $context RequestContext
1947          * @since 1.18
1948          */
1949         public function setContext( $context ) {
1950                 $this->mContext = $context;
1951         }
1952
1953         /**
1954          * Gets the context this Article is executed in
1955          *
1956          * @return RequestContext
1957          * @since 1.18
1958          */
1959         public function getContext() {
1960                 if ( $this->mContext instanceof RequestContext ) {
1961                         return $this->mContext;
1962                 } else {
1963                         wfDebug( __METHOD__ . " called and \$mContext is null. Return RequestContext::getMain(); for sanity\n" );
1964                         return RequestContext::getMain();
1965                 }
1966         }
1967
1968         /**
1969          * Use PHP's magic __get handler to handle accessing of
1970          * raw WikiPage fields for backwards compatibility.
1971          *
1972          * @param $fname String Field name
1973          */
1974         public function __get( $fname ) {
1975                 if ( property_exists( $this->mPage, $fname ) ) {
1976                         #wfWarn( "Access to raw $fname field " . __CLASS__ );
1977                         return $this->mPage->$fname;
1978                 }
1979         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1980         }
1981
1982         /**
1983          * Use PHP's magic __set handler to handle setting of
1984          * raw WikiPage fields for backwards compatibility.
1985          *
1986          * @param $fname String Field name
1987          * @param $fvalue mixed New value
1988          * @param $args Array Arguments to the method
1989          */
1990         public function __set( $fname, $fvalue ) {
1991                 if ( property_exists( $this->mPage, $fname ) ) {
1992                         #wfWarn( "Access to raw $fname field of " . __CLASS__ );
1993                         $this->mPage->$fname = $fvalue;
1994                 // Note: extensions may want to toss on new fields
1995                 } elseif ( !in_array( $fname, array( 'mContext', 'mPage' ) ) ) {
1996                         $this->mPage->$fname = $fvalue;
1997                 } else {
1998                         trigger_error( 'Inaccessible property via __get(): ' . $fname, E_USER_NOTICE );
1999                 }
2000         }
2001
2002         /**
2003          * Use PHP's magic __call handler to transform instance calls to
2004          * WikiPage functions for backwards compatibility.
2005          *
2006          * @param $fname String Name of called method
2007          * @param $args Array Arguments to the method
2008          */
2009         public function __call( $fname, $args ) {
2010                 if ( is_callable( array( $this->mPage, $fname ) ) ) {
2011                         #wfWarn( "Call to " . __CLASS__ . "::$fname; please use WikiPage instead" );
2012                         return call_user_func_array( array( $this->mPage, $fname ), $args );
2013                 }
2014         trigger_error( 'Inaccessible function via __call(): ' . $fname, E_USER_ERROR );
2015         }
2016
2017         // ****** B/C functions to work-around PHP silliness with __call and references ****** //
2018         public function updateRestrictions( $limit = array(), $reason = '', &$cascade = 0, $expiry = array() ) {
2019                 return $this->mPage->updateRestrictions( $limit, $reason, $cascade, $expiry );
2020         }
2021
2022         public function doDeleteArticle( $reason, $suppress = false, $id = 0, $commit = true, &$error = '' ) {
2023                 return $this->mPage->doDeleteArticle( $reason, $suppress, $id, $commit, $error );
2024         }
2025
2026         public function doRollback( $fromP, $summary, $token, $bot, &$resultDetails, User $user = null ) {
2027                 global $wgUser;
2028                 $user = is_null( $user ) ? $wgUser : $user;
2029                 return $this->mPage->doRollback( $fromP, $summary, $token, $bot, $resultDetails, $user );
2030         }
2031
2032         public function commitRollback( $fromP, $summary, $bot, &$resultDetails, User $guser = null ) {
2033                 global $wgUser;
2034                 $guser = is_null( $guser ) ? $wgUser : $guser;
2035                 return $this->mPage->commitRollback( $fromP, $summary, $bot, $resultDetails, $guser );
2036         }
2037
2038         // ****** B/C functions for static methods ( __callStatic is PHP>=5.3 ) ****** //
2039         public static function selectFields() {
2040                 return WikiPage::selectFields();
2041         }
2042
2043         public static function onArticleCreate( $title ) {
2044                 return WikiPage::onArticleCreate( $title );
2045         }
2046
2047         public static function onArticleDelete( $title ) {
2048                 return WikiPage::onArticleDelete( $title );
2049         }
2050
2051         public static function onArticleEdit( $title ) {
2052                 return WikiPage::onArticleEdit( $title );
2053         }
2054
2055         public static function getAutosummary( $oldtext, $newtext, $flags ) {
2056                 return WikiPage::getAutosummary( $oldtext, $newtext, $flags );
2057         }
2058         // ******
2059 }
2060
2061 class PoolWorkArticleView extends PoolCounterWork {
2062
2063         /**
2064          * @var Article
2065          */
2066         private $mArticle;
2067
2068         function __construct( $article, $key, $useParserCache, $parserOptions ) {
2069                 parent::__construct( 'ArticleView', $key );
2070                 $this->mArticle = $article;
2071                 $this->cacheable = $useParserCache;
2072                 $this->parserOptions = $parserOptions;
2073         }
2074
2075         function doWork() {
2076                 return $this->mArticle->doViewParse();
2077         }
2078
2079         function getCachedWork() {
2080                 global $wgOut;
2081
2082                 $parserCache = ParserCache::singleton();
2083                 $this->mArticle->mParserOutput = $parserCache->get( $this->mArticle, $this->parserOptions );
2084
2085                 if ( $this->mArticle->mParserOutput !== false ) {
2086                         wfDebug( __METHOD__ . ": showing contents parsed by someone else\n" );
2087                         $wgOut->addParserOutput( $this->mArticle->mParserOutput );
2088                         # Ensure that UI elements requiring revision ID have
2089                         # the correct version information.
2090                         $wgOut->setRevisionId( $this->mArticle->getLatest() );
2091                         return true;
2092                 }
2093                 return false;
2094         }
2095
2096         function fallback() {
2097                 return $this->mArticle->tryDirtyCache();
2098         }
2099
2100         /**
2101          * @param  $status Status
2102          */
2103         function error( $status ) {
2104                 global $wgOut;
2105
2106                 $wgOut->clearHTML(); // for release() errors
2107                 $wgOut->enableClientCache( false );
2108                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
2109
2110                 $errortext = $status->getWikiText( false, 'view-pool-error' );
2111                 $wgOut->addWikiText( '<div class="errorbox">' . $errortext . '</div>' );
2112
2113                 return false;
2114         }
2115 }