+ $wgOut->setArticleFlag( true );
+ # Set page title (may be overridden by DISPLAYTITLE)
+ $wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
+
+ # If we got diff in the query, we want to see a diff page instead of the article.
+ if ( !is_null( $wgRequest->getVal( 'diff' ) ) ) {
+ wfDebug( __METHOD__ . ": showing diff page\n" );
+ $this->showDiffPage();
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ # Should the parser cache be used?
+ $useParserCache = $this->useParserCache( $oldid );
+ wfDebug( 'Article::view using parser cache: ' . ( $useParserCache ? 'yes' : 'no' ) . "\n" );
+ if ( $wgUser->getOption( 'stubthreshold' ) ) {
+ wfIncrStats( 'pcache_miss_stub' );
+ }
+
+ $wasRedirected = $this->showRedirectedFromHeader();
+ $this->showNamespaceHeader();
+
+ # Iterate through the possible ways of constructing the output text.
+ # Keep going until $outputDone is set, or we run out of things to do.
+ $pass = 0;
+ $outputDone = false;
+ $this->mParserOutput = false;
+ while ( !$outputDone && ++$pass ) {
+ switch( $pass ) {
+ case 1:
+ wfRunHooks( 'ArticleViewHeader', array( &$this, &$outputDone, &$useParserCache ) );
+ break;
+
+ case 2:
+ # Try the parser cache
+ if ( $useParserCache ) {
+ $this->mParserOutput = $parserCache->get( $this, $parserOptions );
+ if ( $this->mParserOutput !== false ) {
+ wfDebug( __METHOD__ . ": showing parser cache contents\n" );
+ $wgOut->addParserOutput( $this->mParserOutput );
+ # Ensure that UI elements requiring revision ID have
+ # the correct version information.
+ $wgOut->setRevisionId( $this->mLatest );
+ $outputDone = true;
+ }
+ }
+ break;
+
+ case 3:
+ $text = $this->getContent();
+ if ( $text === false || $this->getID() == 0 ) {
+ wfDebug( __METHOD__ . ": showing missing article\n" );
+ $this->showMissingArticle();
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ # Another whitelist check in case oldid is altering the title
+ if ( !$this->mTitle->userCanRead() ) {
+ wfDebug( __METHOD__ . ": denied on secondary read check\n" );
+ $wgOut->loginToUse();
+ $wgOut->output();
+ $wgOut->disable();
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+
+ # Are we looking at an old revision
+ if ( $oldid && !is_null( $this->mRevision ) ) {
+ $this->setOldSubtitle( $oldid );
+ if ( !$this->showDeletedRevisionHeader() ) {
+ wfDebug( __METHOD__ . ": cannot view deleted revision\n" );
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ # If this "old" version is the current, then try the parser cache...
+ if ( $oldid === $this->getLatest() && $this->useParserCache( false ) ) {
+ $this->mParserOutput = $parserCache->get( $this, $parserOptions );
+ if ( $this->mParserOutput ) {
+ wfDebug( __METHOD__ . ": showing parser cache for current rev permalink\n" );
+ $wgOut->addParserOutput( $this->mParserOutput );
+ $wgOut->setRevisionId( $this->mLatest );
+ $this->showViewFooter();
+ $this->viewUpdates();
+ wfProfileOut( __METHOD__ );
+ return;
+ }
+ }
+ }
+
+ # Ensure that UI elements requiring revision ID have
+ # the correct version information.
+ $wgOut->setRevisionId( $this->getRevIdFetched() );
+
+ # Pages containing custom CSS or JavaScript get special treatment
+ if ( $this->mTitle->isCssOrJsPage() || $this->mTitle->isCssJsSubpage() ) {
+ wfDebug( __METHOD__ . ": showing CSS/JS source\n" );
+ $this->showCssOrJsPage();
+ $outputDone = true;
+ } else if ( $rt = Title::newFromRedirectArray( $text ) ) {
+ wfDebug( __METHOD__ . ": showing redirect=no page\n" );
+ # Viewing a redirect page (e.g. with parameter redirect=no)
+ # Don't append the subtitle if this was an old revision
+ $wgOut->addHTML( $this->viewRedirect( $rt, !$wasRedirected && $this->isCurrent() ) );
+ # Parse just to get categories, displaytitle, etc.
+ $this->mParserOutput = $wgParser->parse( $text, $this->mTitle, $parserOptions );
+ $wgOut->addParserOutputNoText( $this->mParserOutput );
+ $outputDone = true;
+ }
+ break;
+
+ case 4:
+ # Run the parse, protected by a pool counter
+ wfDebug( __METHOD__ . ": doing uncached parse\n" );
+ $key = $parserCache->getKey( $this, $parserOptions );
+ $poolCounter = PoolCounter::factory( 'Article::view', $key );
+ $dirtyCallback = $useParserCache ? array( $this, 'tryDirtyCache' ) : false;
+ $status = $poolCounter->executeProtected( array( $this, 'doViewParse' ), $dirtyCallback );
+
+ if ( !$status->isOK() ) {
+ # Connection or timeout error
+ $this->showPoolError( $status );
+ wfProfileOut( __METHOD__ );
+ return;
+ } else {
+ $outputDone = true;
+ }
+ break;
+
+ # Should be unreachable, but just in case...
+ default:
+ break 2;
+ }
+ }
+
+ # Adjust the title if it was set by displaytitle, -{T|}- or language conversion
+ if ( $this->mParserOutput ) {
+ $titleText = $this->mParserOutput->getTitleText();
+ if ( strval( $titleText ) !== '' ) {
+ $wgOut->setPageTitle( $titleText );
+ }
+ }
+
+ # For the main page, overwrite the <title> element with the con-
+ # tents of 'pagetitle-view-mainpage' instead of the default (if
+ # that's not empty).
+ if ( $this->mTitle->equals( Title::newMainPage() )
+ && ( $m = wfMsgForContent( 'pagetitle-view-mainpage' ) ) !== '' )
+ {
+ $wgOut->setHTMLTitle( $m );
+ }
+
+ # Now that we've filled $this->mParserOutput, we know whether
+ # there are any __NOINDEX__ tags on the page
+ $policy = $this->getRobotPolicy( 'view' );
+ $wgOut->setIndexPolicy( $policy['index'] );
+ $wgOut->setFollowPolicy( $policy['follow'] );
+
+ $this->showViewFooter();
+ $this->viewUpdates();
+ wfProfileOut( __METHOD__ );
+ }
+
+ /**
+ * Show a diff page according to current request variables. For use within
+ * Article::view() only, other callers should use the DifferenceEngine class.
+ */
+ public function showDiffPage() {
+ global $wgOut, $wgRequest, $wgUser;
+