article.php

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				$this->mCounter = 0;
			} else {
				$dbr =& wfGetDB( DB_SLAVE );
				$this->mCounter = $dbr->selectField( 'page', 'page_counter', array( 'page_id' => $id ),
					'Article::getCount', $this->getSelectOptions() );
			}
		}
		return $this->mCounter;
	}

	/**
	 * Determine whether a page  would be suitable for being counted as an
	 * article in the site_stats table based on the title & its content
	 *
	 * @param $text String: text to analyze
	 * @return bool
	 */
	function isCountable( $text ) {
		global $wgUseCommaCount, $wgContentNamespaces;

		$token = $wgUseCommaCount ? ',' : '[[';
		return
			array_search( $this->mTitle->getNamespace(), $wgContentNamespaces ) !== false
			&& ! $this->isRedirect( $text )
			&& in_string( $token, $text );
	}

	/**
	 * Tests if the article text represents a redirect
	 *
	 * @param $text String: FIXME
	 * @return bool
	 */
	function isRedirect( $text = false ) {
		if ( $text === false ) {
			$this->loadContent();
			$titleObj = Title::newFromRedirect( $this->fetchContent() );
		} else {
			$titleObj = Title::newFromRedirect( $text );
		}
		return $titleObj !== NULL;
	}

	/**
	 * Returns true if the currently-referenced revision is the current edit
	 * to this page (and it exists).
	 * @return bool
	 */
	function isCurrent() {
		return $this->exists() &&
			isset( $this->mRevision ) &&
			$this->mRevision->isCurrent();
	}

	/**
	 * Loads everything except the text
	 * This isn't necessary for all uses, so it's only done if needed.
	 * @private
	 */
	function loadLastEdit() {
		if ( -1 != $this->mUser )
			return;

		# New or non-existent articles have no user information
		$id = $this->getID();
		if ( 0 == $id ) return;

		$this->mLastRevision = Revision::loadFromPageId( $this->getDB(), $id );
		if( !is_null( $this->mLastRevision ) ) {
			$this->mUser      = $this->mLastRevision->getUser();
			$this->mUserText  = $this->mLastRevision->getUserText();
			$this->mTimestamp = $this->mLastRevision->getTimestamp();
			$this->mComment   = $this->mLastRevision->getComment();
			$this->mMinorEdit = $this->mLastRevision->isMinor();
			$this->mRevIdFetched = $this->mLastRevision->getID();
		}
	}

	function getTimestamp() {
		// Check if the field has been filled by ParserCache::get()
		if ( !$this->mTimestamp ) {
			$this->loadLastEdit();
		}
		return wfTimestamp(TS_MW, $this->mTimestamp);
	}

	function getUser() {
		$this->loadLastEdit();
		return $this->mUser;
	}

	function getUserText() {
		$this->loadLastEdit();
		return $this->mUserText;
	}

	function getComment() {
		$this->loadLastEdit();
		return $this->mComment;
	}

	function getMinorEdit() {
		$this->loadLastEdit();
		return $this->mMinorEdit;
	}

	function getRevIdFetched() {
		$this->loadLastEdit();
		return $this->mRevIdFetched;
	}

	/**
	 * @todo Document, fixme $offset never used.
	 * @param $limit Integer: default 0.
	 * @param $offset Integer: default 0.
	 */
	function getContributors($limit = 0, $offset = 0) {
		# XXX: this is expensive; cache this info somewhere.

		$title = $this->mTitle;
		$contribs = array();
		$dbr =& wfGetDB( DB_SLAVE );
		$revTable = $dbr->tableName( 'revision' );
		$userTable = $dbr->tableName( 'user' );
		$encDBkey = $dbr->addQuotes( $title->getDBkey() );
		$ns = $title->getNamespace();
		$user = $this->getUser();
		$pageId = $this->getId();

		$sql = "SELECT rev_user, rev_user_text, user_real_name, MAX(rev_timestamp) as timestamp
			FROM $revTable LEFT JOIN $userTable ON rev_user = user_id
			WHERE rev_page = $pageId
			AND rev_user != $user
			GROUP BY rev_user, rev_user_text, user_real_name
			ORDER BY timestamp DESC";

		if ($limit > 0) { $sql .= ' LIMIT '.$limit; }
		$sql .= ' '. $this->getSelectOptions();

		$res = $dbr->query($sql, __METHOD__);

		while ( $line = $dbr->fetchObject( $res ) ) {
			$contribs[] = array($line->rev_user, $line->rev_user_text, $line->user_real_name);
		}

		$dbr->freeResult($res);
		return $contribs;
	}

	/**
	 * This is the default action of the script: just view the page of
	 * the given title.
	*/
	function view()	{
		global $wgUser, $wgOut, $wgRequest, $wgContLang;
		global $wgEnableParserCache, $wgStylePath, $wgUseRCPatrol, $wgParser;
		global $wgUseTrackbacks, $wgNamespaceRobotPolicies;
		$sk = $wgUser->getSkin();

		wfProfileIn( __METHOD__ );

		$parserCache =& ParserCache::singleton();
		$ns = $this->mTitle->getNamespace(); # shortcut
		
		# Get variables from query string
		$oldid = $this->getOldID();

		# getOldID may want us to redirect somewhere else
		if ( $this->mRedirectUrl ) {
			$wgOut->redirect( $this->mRedirectUrl );
			wfProfileOut( __METHOD__ );
			return;
		}

		$diff = $wgRequest->getVal( 'diff' );
		$rcid = $wgRequest->getVal( 'rcid' );
		$rdfrom = $wgRequest->getVal( 'rdfrom' );

		$wgOut->setArticleFlag( true );
		if ( isset( $wgNamespaceRobotPolicies[$ns] ) ) {
			$policy = $wgNamespaceRobotPolicies[$ns];
		} else {
			$policy = 'index,follow';
		}
		$wgOut->setRobotpolicy( $policy );

		# If we got diff and oldid in the query, we want to see a
		# diff page instead of the article.

		if ( !is_null( $diff ) ) {
			require_once( 'DifferenceEngine.php' );
			$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );

			$de = new DifferenceEngine( $this->mTitle, $oldid, $diff, $rcid );
			// DifferenceEngine directly fetched the revision:
			$this->mRevIdFetched = $de->mNewid;
			$de->showDiffPage();

			if( $diff == 0 ) {
				# Run view updates for current revision only
				$this->viewUpdates();
			}
			wfProfileOut( __METHOD__ );
			return;
		}
		
		if ( empty( $oldid ) && $this->checkTouched() ) {
			$wgOut->setETag($parserCache->getETag($this, $wgUser));

			if( $wgOut->checkLastModified( $this->mTouched ) ){
				wfProfileOut( __METHOD__ );
				return;
			} else if ( $this->tryFileCache() ) {
				# tell wgOut that output is taken care of
				$wgOut->disable();
				$this->viewUpdates();
				wfProfileOut( __METHOD__ );
				return;
			}
		}

		# Should the parser cache be used?
		$pcache = $wgEnableParserCache &&
			intval( $wgUser->getOption( 'stubthreshold' ) ) == 0 &&
			$this->exists() &&
			empty( $oldid );
		wfDebug( 'Article::view using parser cache: ' . ($pcache ? 'yes' : 'no' ) . "\n" );
		if ( $wgUser->getOption( 'stubthreshold' ) ) {
			wfIncrStats( 'pcache_miss_stub' );
		}

		$wasRedirected = false;
		if ( isset( $this->mRedirectedFrom ) ) {
			// This is an internally redirected page view.
			// We'll need a backlink to the source page for navigation.
			if ( wfRunHooks( 'ArticleViewRedirect', array( &$this ) ) ) {
				$sk = $wgUser->getSkin();
				$redir = $sk->makeKnownLinkObj( $this->mRedirectedFrom, '', 'redirect=no' );
				$s = wfMsg( 'redirectedfrom', $redir );
				$wgOut->setSubtitle( $s );
				$wasRedirected = true;
			}
		} elseif ( !empty( $rdfrom ) ) {
			// This is an externally redirected view, from some other wiki.
			// If it was reported from a trusted site, supply a backlink.
			global $wgRedirectSources;
			if( $wgRedirectSources && preg_match( $wgRedirectSources, $rdfrom ) ) {
				$sk = $wgUser->getSkin();
				$redir = $sk->makeExternalLink( $rdfrom, $rdfrom );
				$s = wfMsg( 'redirectedfrom', $redir );
				$wgOut->setSubtitle( $s );
				$wasRedirected = true;
			}
		}
		
		$outputDone = false;
		if ( $pcache ) {
			if ( $wgOut->tryParserCache( $this, $wgUser ) ) {
				$outputDone = true;
			}
		}
		if ( !$outputDone ) {
			$text = $this->getContent();
			if ( $text === false ) {
				# Failed to load, replace text with error message
				$t = $this->mTitle->getPrefixedText();
				if( $oldid ) {
					$t .= ',oldid='.$oldid;
					$text = wfMsg( 'missingarticle', $t );
				} else {
					$text = wfMsg( 'noarticletext', $t );
				}
			}

			# Another whitelist check in case oldid is altering the title
			if ( !$this->mTitle->userCanRead() ) {
				$wgOut->loginToUse();
				$wgOut->output();
				exit;
			}

			# We're looking at an old revision

			if ( !empty( $oldid ) ) {
				$wgOut->setRobotpolicy( 'noindex,nofollow' );
				if( is_null( $this->mRevision ) ) {
					// FIXME: This would be a nice place to load the 'no such page' text.
				} else {
					$this->setOldSubtitle( isset($this->mOldId) ? $this->mOldId : $oldid );
					if( $this->mRevision->isDeleted( Revision::DELETED_TEXT ) ) {
						if( !$this->mRevision->userCan( Revision::DELETED_TEXT ) ) {
							$wgOut->addWikiText( wfMsg( 'rev-deleted-text-permission' ) );
							$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
							return;
						} else {
							$wgOut->addWikiText( wfMsg( 'rev-deleted-text-view' ) );
							// and we are allowed to see...
						}
					}
				}

			}
		}
		if( !$outputDone ) {
			/**
			 * @fixme: this hook doesn't work most of the time, as it doesn't
			 * trigger when the parser cache is used.
			 */
			wfRunHooks( 'ArticleViewHeader', array( &$this ) ) ;
			$wgOut->setRevisionId( $this->getRevIdFetched() );
			# wrap user css and user js in pre and don't parse
			# XXX: use $this->mTitle->usCssJsSubpage() when php is fixed/ a workaround is found
			if (
				$ns == NS_USER &&
				preg_match('/\\/[\\w]+\\.(css|js)$/', $this->mTitle->getDBkey())
			) {
				$wgOut->addWikiText( wfMsg('clearyourcache'));
				$wgOut->addHTML( '<pre>'.htmlspecialchars($this->mContent)."\n</pre>" );
			} else if ( $rt = Title::newFromRedirect( $text ) ) {
				# Display redirect
				$imageDir = $wgContLang->isRTL() ? 'rtl' : 'ltr';
				$imageUrl = $wgStylePath.'/common/images/redirect' . $imageDir . '.png';
				# Don't overwrite the subtitle if this was an old revision
				if( !$wasRedirected && $this->isCurrent() ) {
					$wgOut->setSubtitle( wfMsgHtml( 'redirectpagesub' ) );
				}
				$targetUrl = $rt->escapeLocalURL();
				#聽fixme unused $titleText :
				$titleText = htmlspecialchars( $rt->getPrefixedText() );
				$link = $sk->makeLinkObj( $rt );

				$wgOut->addHTML( '<img src="'.$imageUrl.'" alt="#REDIRECT" />' .
				  '<span class="redirectText">'.$link.'</span>' );

				$parseout = $wgParser->parse($text, $this->mTitle, ParserOptions::newFromUser($wgUser));
				$wgOut->addParserOutputNoText( $parseout );
			} else if ( $pcache ) {
				# Display content and save to parser cache
				$wgOut->addPrimaryWikiText( $text, $this );
			} else {
				# Display content, don't attempt to save to parser cache
				# Don't show section-edit links on old revisions... this way lies madness.
				if( !$this->isCurrent() ) {
					$oldEditSectionSetting = $wgOut->mParserOptions->setEditSection( false );
				}
				# Display content and don't save to parser cache
				$wgOut->addPrimaryWikiText( $text, $this, false );

				if( !$this->isCurrent() ) {
					$wgOut->mParserOptions->setEditSection( $oldEditSectionSetting );
				}
			}
		}
		/* title may have been set from the cache */
		$t = $wgOut->getPageTitle();
		if( empty( $t ) ) {
			$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
		}

		# check if we're displaying a [[User talk:x.x.x.x]] anonymous talk page
		if( $ns == NS_USER_TALK &&
			User::isIP( $this->mTitle->getText() ) ) {
			$wgOut->addWikiText( wfMsg('anontalkpagetext') );
		}

		# If we have been passed an &rcid= parameter, we want to give the user a
		# chance to mark this new article as patrolled.
		if ( $wgUseRCPatrol && !is_null( $rcid ) && $rcid != 0 && $wgUser->isAllowed( 'patrol' ) ) {
			$wgOut->addHTML(
				"<div class='patrollink'>" .
					wfMsg ( 'markaspatrolledlink',
					$sk->makeKnownLinkObj( $this->mTitle, wfMsg('markaspatrolledtext'), "action=markpatrolled&rcid=$rcid" )
			 		) .
				'</div>'
			 );
		}

		# Trackbacks
		if ($wgUseTrackbacks)
			$this->addTrackbacks();

		$this->viewUpdates();
		wfProfileOut( __METHOD__ );
	}

	function addTrackbacks() {
		global $wgOut, $wgUser;

		$dbr =& wfGetDB(DB_SLAVE);
		$tbs = $dbr->select(
				/* FROM   */ 'trackbacks',
				/* SELECT */ array('tb_id', 'tb_title', 'tb_url', 'tb_ex', 'tb_name'),
				/* WHERE  */ array('tb_page' => $this->getID())
		);

		if (!$dbr->numrows($tbs))
			return;

		$tbtext = "";
		while ($o = $dbr->fetchObject($tbs)) {
			$rmvtxt = "";
			if ($wgUser->isAllowed( 'trackback' )) {
				$delurl = $this->mTitle->getFullURL("action=deletetrackback&tbid="
						. $o->tb_id . "&token=" . $wgUser->editToken());
				$rmvtxt = wfMsg('trackbackremove', $delurl);
			}
			$tbtext .= wfMsg(strlen($o->tb_ex) ? 'trackbackexcerpt' : 'trackback',
					$o->tb_title,
					$o->tb_url,
					$o->tb_ex,
					$o->tb_name,
					$rmvtxt);
		}
		$wgOut->addWikitext(wfMsg('trackbackbox', $tbtext));
	}

	function deletetrackback() {
		global $wgUser, $wgRequest, $wgOut, $wgTitle;

		if (!$wgUser->matchEditToken($wgRequest->getVal('token'))) {
			$wgOut->addWikitext(wfMsg('sessionfailure'));
			return;
		}

		if ((!$wgUser->isAllowed('delete'))) {
			$wgOut->sysopRequired();
			return;
		}

		if (wfReadOnly()) {
			$wgOut->readOnlyPage();
			return;
		}

		$db =& wfGetDB(DB_MASTER);
		$db->delete('trackbacks', array('tb_id' => $wgRequest->getInt('tbid')));
		$wgTitle->invalidateCache();
		$wgOut->addWikiText(wfMsg('trackbackdeleteok'));
	}

	function render() {
		global $wgOut;

		$wgOut->setArticleBodyOnly(true);
		$this->view();
	}

	/**
	 * Handle action=purge
	 */
	function purge() {
		global $wgUser, $wgRequest, $wgOut;

		if ( $wgUser->isLoggedIn() || $wgRequest->wasPosted() ) {
			if( wfRunHooks( 'ArticlePurge', array( &$this ) ) ) {
				$this->doPurge();
			}
		} else {
			$msg = $wgOut->parse( wfMsg( 'confirm_purge' ) );
			$action = $this->mTitle->escapeLocalURL( 'action=purge' );
			$button = htmlspecialchars( wfMsg( 'confirm_purge_button' ) );
			$msg = str_replace( '$1',
				"<form method=\"post\" action=\"$action\">\n" .