MediaWikiDoc:OutputPage.php

Notes

From Design.doc: Encapsulates the entire HTML page that will be sent in response to any server request. It is used by calling its functions to add text, headers, etc., in any order, and then calling output() to send it all. It could be easily changed to send incrementally if that becomes useful, but I prefer the flexibility. This should also do the output encoding. The system allocates a global one in $wgOut. This class also handles converting wikitext format to HTML.

Source Code

<?php
/**
 * @package MediaWiki
 */

/**
 * This is not a valid entry point, perform no further processing unless MEDIAWIKI is defined
 */
if( defined( 'MEDIAWIKI' ) ) {

# See design.doc

if($wgUseTeX) require_once( 'Math.php' );

/**
 * @todo document
 * @package MediaWiki
 */

class OutputPage

class OutputPage {
	var $mHeaders, $mCookies, $mMetatags, $mKeywords;
	var $mLinktags, $mPagetitle, $mBodytext, $mDebugtext;
	var $mHTMLtitle, $mRobotpolicy, $mIsarticle, $mPrintable;
	var $mSubtitle, $mRedirect;
	var $mLastModified, $mCategoryLinks;
	var $mScripts, $mLinkColours;
	
	var $mSuppressQuickbar;
	var $mOnloadHandler;
	var $mDoNothing;
	var $mContainsOldMagic, $mContainsNewMagic;
	var $mIsArticleRelated;
	var $mParserOptions;
	var $mShowFeedLinks = false;
	var $mEnableClientCache = true;

function OutputPage

	/**
	 * Constructor
	 * Initialise private variables
	 */
	function OutputPage() {
		$this->mHeaders = $this->mCookies = $this->mMetatags =
		$this->mKeywords = $this->mLinktags = array();
		$this->mHTMLtitle = $this->mPagetitle = $this->mBodytext =
		$this->mRedirect = $this->mLastModified =
		$this->mSubtitle = $this->mDebugtext = $this->mRobotpolicy =
		$this->mOnloadHandler = '';
		$this->mIsArticleRelated = $this->mIsarticle = $this->mPrintable = true;
		$this->mSuppressQuickbar = $this->mPrintable = false;
		$this->mLanguageLinks = array();
		$this->mCategoryLinks = array() ;
		$this->mDoNothing = false;
		$this->mContainsOldMagic = $this->mContainsNewMagic = 0;
		$this->mParserOptions = ParserOptions::newFromUser( $temp = NULL );
		$this->mSquidMaxage = 0;
		$this->mScripts = '';
	}

function addHeader

function addHeader( $name, $val ) { array_push( $this->mHeaders, $name.': '.$val ) ; }

function addCookie

function addCookie( $name, $val ) { array_push( $this->mCookies, array( $name, $val ) ); }

function redirect

function redirect( $url, $responsecode = '302' ) { $this->mRedirect = $url; $this->mRedirectCode = $responsecode; }

function addMeta

# To add an http-equiv meta tag, precede the name with "http:"
function addMeta( $name, $val ) { array_push( $this->mMetatags, array( $name, $val ) ); }

function addKeyword

function addKeyword( $text ) { array_push( $this->mKeywords, $text ); }

function addScript

function addScript( $script ) { $this->mScripts .= $script; }

function getScript

function getScript() { return $this->mScripts; }

function addLink

	function addLink( $linkarr ) {
		# $linkarr should be an associative array of attributes. We'll escape on output.
		array_push( $this->mLinktags, $linkarr );
	}

function addMetadataLink

	function addMetadataLink( $linkarr ) {
		# note: buggy CC software only reads first "meta" link
		static $haveMeta = false;
		$linkarr['rel'] = ($haveMeta) ? 'alternate meta' : 'meta';
		$this->addLink( $linkarr );
		$haveMeta = true;
	}

function checkLastModified

	/**
	 * checkLastModified tells the client to use the client-cached page if
	 * possible. If sucessful, the OutputPage is disabled so that
	 * any future call to OutputPage->output() have no effect. The method
	 * returns true iff cache-ok headers was sent.
	 */
	function checkLastModified ( $timestamp ) {
		global $wgLang, $wgCachePages, $wgUser;
		$timestamp=wfTimestamp(TS_MW,$timestamp);
		if( !$wgCachePages ) {
			wfDebug( "CACHE DISABLED\n", false );
			return;
		}
		if( $wgUser->getOption( 'nocache' ) ) {
			wfDebug( "USER DISABLED CACHE\n", false );
			return;
		}

		$lastmod = gmdate( 'D, j M Y H:i:s', wfTimestamp(TS_UNIX, max( $timestamp, $wgUser->mTouched ) ) ) . ' GMT';

		if( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
			# IE sends sizes after the date like this:
			# Wed, 20 Aug 2003 06:51:19 GMT; length=5202
			# this breaks strtotime().
			$modsince = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
			$ismodsince = wfTimestamp( TS_MW, strtotime( $modsince ) );
			wfDebug( "-- client send If-Modified-Since: " . $modsince . "\n", false );
			wfDebug( "--  we might send Last-Modified : $lastmod\n", false );
			if( ($ismodsince >= $timestamp ) && $wgUser->validateCache( $ismodsince ) ) {
				# Make sure you're in a place you can leave when you call us!
				header( "HTTP/1.0 304 Not Modified" );
				$this->mLastModified = $lastmod;
				$this->sendCacheControl();
				wfDebug( "CACHED client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
				$this->disable();
				return true;
			} else {
				wfDebug( "READY  client: $ismodsince ; user: $wgUser->mTouched ; page: $timestamp\n", false );
				$this->mLastModified = $lastmod;
			}
		} else {
			wfDebug( "We're confused.\n", false );
			$this->mLastModified = $lastmod;
		}
	}

function getPageTitleActionText

	function getPageTitleActionText () {
		global $action;
		switch($action) {
			case 'edit':
				return wfMsg('edit');
			case 'history':
				return wfMsg('history_short');
			case 'protect':
				return wfMsg('protect');
			case 'unprotect':
				return wfMsg('unprotect');
			case 'delete':
				return wfMsg('delete');
			case 'watch':
				return wfMsg('watch');
			case 'unwatch':
				return wfMsg('unwatch');
			case 'submit':
				return wfMsg('preview');
			case 'info':
				return wfMsg('info_short');
			default:
				return '';
		}
	}

function setRobotpolicy

function setRobotpolicy( $str ) { $this->mRobotpolicy = $str; }

function setHTMLTitle

function setHTMLTitle( $name ) {$this->mHTMLtitle = $name; }

function setPageTitle

	function setPageTitle( $name ) {
		global $action, $wgContLang;
		$name = $wgContLang->convert($name, true);
		$this->mPagetitle = $name;
		if(!empty($action)) {
			$taction =  $this->getPageTitleActionText();
			if( !empty( $taction ) ) {
				$name .= ' - '.$taction;
			}
		}
		$this->setHTMLTitle( $name . ' - ' . wfMsg( 'wikititlesuffix' ) );
	}

function getHTMLTitle

function getHTMLTitle() { return $this->mHTMLtitle; }

function getPageTitle

function getPageTitle() { return $this->mPagetitle; }

Some One-Line Functions

	function setSubtitle( $str ) { $this->mSubtitle = $str; }
	function getSubtitle() { return $this->mSubtitle; }
	function isArticle() { return $this->mIsarticle; }
	function setPrintable() { $this->mPrintable = true; }
	function isPrintable() { return $this->mPrintable; }
	function setSyndicated( $show = true ) { $this->mShowFeedLinks = $show; }
	function isSyndicated() { return $this->mShowFeedLinks; }
	function setOnloadHandler( $js ) { $this->mOnloadHandler = $js; }
	function getOnloadHandler() { return $this->mOnloadHandler; }
	function disable() { $this->mDoNothing = true; }

function setArticleRelated

	function setArticleRelated( $v ) {
		$this->mIsArticleRelated = $v;
		if ( !$v ) {
			$this->mIsarticle = false;
		}
	}

function setArticleFlag

	function setArticleFlag( $v ) {
		$this->mIsarticle = $v;
		if ( $v ) {
			$this->mIsArticleRelated = $v;
		}
	}

function isArticleRelated

function isArticleRelated() { return $this->mIsArticleRelated; }

function getLanguageLinks

function getLanguageLinks() { return $this->mLanguageLinks; }

function addLanguageLinks

	function addLanguageLinks($newLinkArray) {
		$this->mLanguageLinks += $newLinkArray;
	}

function setLanguageLinks

	function setLanguageLinks($newLinkArray) {
		$this->mLanguageLinks = $newLinkArray;
	}

function getCategoryLinks

	function getCategoryLinks() {
		return $this->mCategoryLinks;
	}

function addCategoryLinks

	function addCategoryLinks($newLinkArray) {
		$this->mCategoryLinks += $newLinkArray;
	}

function setCategoryLinks

	function setCategoryLinks($newLinkArray) {
		$this->mCategoryLinks += $newLinkArray;
	}

More One-Line Functions

	function suppressQuickbar() { $this->mSuppressQuickbar = true; }
	function isQuickbarSuppressed() { return $this->mSuppressQuickbar; }

	function addHTML( $text ) { $this->mBodytext .= $text; }
	function clearHTML() { $this->mBodytext = ''; }
	function debug( $text ) { $this->mDebugtext .= $text; }

function setParserOptions

	function setParserOptions( $options ) {
		return wfSetVar( $this->mParserOptions, $options );
	}

function addWikiText

	/**
	 * Convert wikitext to HTML and add it to the buffer
	 */
	function addWikiText( $text, $linestart = true ) {
		global $wgTitle;
		$this->addWikiTextTitle($text, $wgTitle, $linestart);
	}

function addWikiTextWithTitle

	function addWikiTextWithTitle($text, &$title, $linestart = true) {
		$this->addWikiTextTitle($text, $title, $linestart);
	}

function addWikiTextTitle

	function addWikiTextTitle( $text, &$title, $linestart = true ) {
		global $wgParser, $wgUseTidy;

		$parserOutput = $wgParser->parse( $text, $title, $this->mParserOptions, $linestart );
		$this->mLanguageLinks += $parserOutput->getLanguageLinks();
		$this->mCategoryLinks += $parserOutput->getCategoryLinks();
		$this->addHTML( $parserOutput->getText() );
	}

function addPrimaryWikiText

	/**
	 * Add wikitext to the buffer, assuming that this is the primary text for a page view
	 * Saves the text into the parser cache if possible
	 */
	function addPrimaryWikiText( $text, $cacheArticle ) {
		global $wgParser, $wgParserCache, $wgUser, $wgTitle, $wgUseTidy;

		$parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, true );

		$text = $parserOutput->getText();
		
		if ( $cacheArticle ) {
			$wgParserCache->save( $parserOutput, $cacheArticle, $wgUser );
		}

		$this->mLanguageLinks += $parserOutput->getLanguageLinks();
		$this->mCategoryLinks += $parserOutput->getCategoryLinks();
		$this->addHTML( $text );
	}

function addTemplate

	/**
	 * Add the output of a QuickTemplate to the output buffer
	 * @param QuickTemplate $template
	 */
	function addTemplate( &$template ) {
		ob_start();
		$template->execute();
		$this->addHtml( ob_get_contents() );
		ob_end_clean();
	}

function parse

	/**
	 * Parse wikitext and return the HTML. This is for special pages that add the text later
	 */
	function parse( $text, $linestart = true ) {
		global $wgParser, $wgTitle;
		$parserOutput = $wgParser->parse( $text, $wgTitle, $this->mParserOptions, $linestart );
		return $parserOutput->getText();
	}

function tryParserCache

	/**
	 * @param $article
	 * @param $user
	 *
	 * @return bool
	 */
	function tryParserCache( $article, $user ) {
		global $wgParserCache;
		$parserOutput = $wgParserCache->get( $article, $user );
		if ( $parserOutput !== false ) {
			$this->mLanguageLinks += $parserOutput->getLanguageLinks();
			$this->mCategoryLinks += $parserOutput->getCategoryLinks();
			$this->addHTML( $parserOutput->getText() );
			return true;
		} else {
			return false;
		}
	}

function setSquidMaxage

	/**
	 * Set the maximum cache time on the Squid in seconds
	 * @param $maxage
	 */
	function setSquidMaxage( $maxage ) {
		$this->mSquidMaxage = $maxage;
	}

function enableClientCache

	/**
	 * Use enableClientCache(false) to force it to send nocache headers
	 * @param $state
	 */
	function enableClientCache( $state ) {
		return wfSetVar( $this->mEnableClientCache, $state );
	}

function sendCacheControl

	function sendCacheControl() {
		global $wgUseSquid, $wgUseESI;
		# don't serve compressed data to clients who can't handle it
		# maintain different caches for logged-in users and non-logged in ones
		header( 'Vary: Accept-Encoding, Cookie' );
		if( $this->mEnableClientCache ) {
			if( $wgUseSquid && ! isset( $_COOKIE[ini_get( 'session.name') ] ) &&
			  ! $this->isPrintable() && $this->mSquidMaxage != 0 )
			{
				if ( $wgUseESI ) {
					# We'll purge the proxy cache explicitly, but require end user agents
					# to revalidate against the proxy on each visit.
					# Surrogate-Control controls our Squid, Cache-Control downstream caches
					wfDebug( "** proxy caching with ESI; {$this->mLastModified} **\n", false );
					# start with a shorter timeout for initial testing
					# header( 'Surrogate-Control: max-age=2678400+2678400, content="ESI/1.0"');
					header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');
					header( 'Cache-Control: s-maxage=0, must-revalidate, max-age=0' );
				} else {
					# We'll purge the proxy cache for anons explicitly, but require end user agents
					# to revalidate against the proxy on each visit.
					# IMPORTANT! The Squid needs to replace the Cache-Control header with
					# Cache-Control: s-maxage=0, must-revalidate, max-age=0
					wfDebug( "** local proxy caching; {$this->mLastModified} **\n", false );
					# start with a shorter timeout for initial testing
					# header( "Cache-Control: s-maxage=2678400, must-revalidate, max-age=0" );
					header( 'Cache-Control: s-maxage='.$this->mSquidMaxage.', must-revalidate, max-age=0' );
				}
			} else {
				# We do want clients to cache if they can, but they *must* check for updates
				# on revisiting the page.
				wfDebug( "** private caching; {$this->mLastModified} **\n", false );
				header( "Expires: -1" );
				header( "Cache-Control: private, must-revalidate, max-age=0" );
			}
			if($this->mLastModified) header( "Last-modified: {$this->mLastModified}" );
		} else {
			wfDebug( "** no caching **\n", false );

			# In general, the absence of a last modified header should be enough to prevent
			# the client from using its cache. We send a few other things just to make sure.
			header( 'Expires: -1' );
			header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );
			header( 'Pragma: no-cache' );
		}
	}

function output

	/**
	 * Finally, all the text has been munged and accumulated into
	 * the object, let's actually output it:
	 */
	function output() {
		global $wgUser, $wgLang, $wgDebugComments, $wgCookieExpiration;
		global $wgInputEncoding, $wgOutputEncoding, $wgContLanguageCode;
		global $wgDebugRedirects, $wgMimeType, $wgProfiler;

		if( $this->mDoNothing ){
			return;
		}
		$fname = 'OutputPage::output';
		wfProfileIn( $fname );
		$sk = $wgUser->getSkin();

		if ( '' != $this->mRedirect ) {
			if( substr( $this->mRedirect, 0, 4 ) != 'http' ) {
				# Standards require redirect URLs to be absolute
				global $wgServer;
				$this->mRedirect = $wgServer . $this->mRedirect;
			}
			if( $this->mRedirectCode == '301') {
				if( !$wgDebugRedirects ) {
					header("HTTP/1.1 {$this->mRedirectCode} Moved Permanently");
				}
				$this->mLastModified = gmdate( 'D, j M Y H:i:s' ) . ' GMT';
			}

			$this->sendCacheControl();

			if( $wgDebugRedirects ) {
				$url = htmlspecialchars( $this->mRedirect );
				print "<html>\n<head>\n<title>Redirect</title>\n</head>\n<body>\n";
				print "<p>Location: <a href=\"$url\">$url</a></p>\n";
				print "</body>\n</html>\n";
			} else {
				header( 'Location: '.$this->mRedirect );
			}
			if ( isset( $wgProfiler ) ) { wfDebug( $wgProfiler->getOutput() ); }
			wfProfileOut( $fname );
			return;
		}


		# Buffer output; final headers may depend on later processing
		ob_start();

		$this->transformBuffer();
		
		# Disable temporary placeholders, so that the skin produces HTML
		$sk->postParseLinkColour( false );

		header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );
		header( 'Content-language: '.$wgContLanguageCode );

		$exp = time() + $wgCookieExpiration;
		foreach( $this->mCookies as $name => $val ) {
			setcookie( $name, $val, $exp, '/' );
		}

		wfProfileIn( 'Output-skin' );
		$sk->outputPage( $this );
		wfProfileOut( 'Output-skin' );
		
		$this->sendCacheControl();
		ob_end_flush();
		wfProfileOut( $fname );
	}

function out

	function out( $ins ) {
		global $wgInputEncoding, $wgOutputEncoding, $wgContLang;
		if ( 0 == strcmp( $wgInputEncoding, $wgOutputEncoding ) ) {
			$outs = $ins;
		} else {
			$outs = $wgContLang->iconv( $wgInputEncoding, $wgOutputEncoding, $ins );
			if ( false === $outs ) { $outs = $ins; }
		}
		print $outs;
	}

function setEncodings

	function setEncodings() {
		global $wgInputEncoding, $wgOutputEncoding;
		global $wgUser, $wgContLang;

		$wgInputEncoding = strtolower( $wgInputEncoding );

		if( $wgUser->getOption( 'altencoding' ) ) {
			$wgContLang->setAltEncoding();
			return;
		}

		if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {
			$wgOutputEncoding = strtolower( $wgOutputEncoding );
			return;
		}

		/*
		# This code is unused anyway!
		# Commenting out. --bv 2003-11-15

		$a = explode( ",", $_SERVER['HTTP_ACCEPT_CHARSET'] );
		$best = 0.0;
		$bestset = "*";

		foreach ( $a as $s ) {
			if ( preg_match( "/(.*);q=(.*)/", $s, $m ) ) {
				$set = $m[1];
				$q = (float)($m[2]);
			} else {
				$set = $s;
				$q = 1.0;
			}
			if ( $q > $best ) {
				$bestset = $set;
				$best = $q;
			}
		}
		#if ( "*" == $bestset ) { $bestset = "iso-8859-1"; }
		if ( "*" == $bestset ) { $bestset = $wgOutputEncoding; }
		$wgOutputEncoding = strtolower( $bestset );

# Disable for now
#
		*/
		$wgOutputEncoding = $wgInputEncoding;
	}

function reportTime

	/**
	 * Returns a HTML comment with the elapsed time since request.
	 * This method has no side effects.
	 */
	function reportTime() {
		global $wgRequestTime, $wgProfiling, $wgProfileToCommentUser, $wgUser;


		if ( $wgProfiling && $wgUser && $wgProfileToCommentUser &&
		  $wgProfileToCommentUser == $wgUser->getName() ) 
		{
			$prof = wfGetProfilingOutput();
			// Strip end of comment
			$prof = str_replace( '-->', '--<', $prof );
			$com = "<!--\n$prof\n-->\n";
		} else {
			$com = '';
		}


		$now = wfTime();
		list( $usec, $sec ) = explode( ' ', $wgRequestTime );
		$start = (float)$sec + (float)$usec;
		$elapsed = $now - $start;

		# Use real server name if available, so we know which machine
		# in a server farm generated the current page.
		if ( function_exists( 'posix_uname' ) ) {
			$uname = @posix_uname();
		} else {
			$uname = false;
		}
		if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
			$hostname = $uname['nodename'];
		} else {
			# This may be a virtual server.
			$hostname = $_SERVER['SERVER_NAME'];
		}
		$com .= sprintf( "<!-- Served by %s in %01.2f secs. -->\n",
		  $hostname, $elapsed );
		return $com;
	}

function errorpage

	/**
	 * Note: these arguments are keys into wfMsg(), not text!
	 */
	function errorpage( $title, $msg ) {
		global $wgTitle;

		$this->mDebugtext .= 'Original title: ' .
		  $wgTitle->getPrefixedText() . "\n";
		$this->setPageTitle( wfMsg( $title ) );
		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleRelated( false );
		$this->enableClientCache( false );
		$this->mRedirect = '';

		$this->mBodytext = '';
		$this->addHTML( '<p>' . wfMsg( $msg ) . "</p>\n" );
		$this->returnToMain( false );

		$this->output();
		wfErrorExit();
	}

function sysopRequired

	function sysopRequired() {
		global $wgUser;

		$this->setPageTitle( wfMsg( 'sysoptitle' ) );
		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleRelated( false );
		$this->mBodytext = '';

		$sk = $wgUser->getSkin();
		$ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
		$this->addHTML( wfMsg( 'sysoptext', $ap ) );
		$this->returnToMain();
	}

function developerRequired

	function developerRequired() {
		global $wgUser;

		$this->setPageTitle( wfMsg( 'developertitle' ) );
		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleRelated( false );
		$this->mBodytext = '';

		$sk = $wgUser->getSkin();
		$ap = $sk->makeKnownLink( wfMsgForContent( 'administrators' ), '' );
		$this->addHTML( wfMsg( 'developertext', $ap ) );
		$this->returnToMain();
	}

function loginToUse

	function loginToUse() {
		global $wgUser, $wgTitle, $wgContLang;

		$this->setPageTitle( wfMsg( 'loginreqtitle' ) );
		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );
		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleFlag( false );
		$this->mBodytext = '';
		$this->addWikiText( wfMsg( 'loginreqtext' ) );

		# We put a comment in the .html file so a Sysop can diagnose the page the
		# user can't see.
		$this->addHTML( "\n<!--" .
						$wgContLang->getNsText( $wgTitle->getNamespace() ) .
						':' .
						$wgTitle->getDBkey() . '-->' );
		$this->returnToMain();		# Flip back to the main page after 10 seconds.
	}

function databaseError

	function databaseError( $fname, $sql, $error, $errno ) {
		global $wgUser, $wgCommandLineMode, $wgShowSQLErrors;

		$this->setPageTitle( wfMsgNoDB( 'databaseerror' ) );
		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleRelated( false );
		$this->enableClientCache( false );
		$this->mRedirect = '';

		if( !$wgShowSQLErrors ) {
			$sql = wfMsg( 'sqlhidden' );
		}

		if ( $wgCommandLineMode ) {
			$msg = wfMsgNoDB( 'dberrortextcl', htmlspecialchars( $sql ),
						htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
		} else {
			$msg = wfMsgNoDB( 'dberrortext', htmlspecialchars( $sql ),
						htmlspecialchars( $fname ), $errno, htmlspecialchars( $error ) );
		}

		if ( $wgCommandLineMode || !is_object( $wgUser )) {
			print $msg."\n";
			wfErrorExit();
		}
		$this->mBodytext = $msg;
		$this->output();
		wfErrorExit();
	}

function readOnlyPage

	function readOnlyPage( $source = null, $protected = false ) {
		global $wgUser, $wgReadOnlyFile, $wgReadOnly;

		$this->setRobotpolicy( 'noindex,nofollow' );
		$this->setArticleRelated( false );

		if( $protected ) {
			$this->setPageTitle( wfMsg( 'viewsource' ) );
			$this->addWikiText( wfMsg( 'protectedtext' ) );
		} else {
			$this->setPageTitle( wfMsg( 'readonly' ) );
			if ( $wgReadOnly ) {
				$reason = $wgReadOnly;
			} else {
				$reason = file_get_contents( $wgReadOnlyFile );
			}
			$this->addWikiText( wfMsg( 'readonlytext', $reason ) );
		}

		if( is_string( $source ) ) {
			if( strcmp( $source, '' ) == 0 ) {
				$source = wfMsg( 'noarticletext' );
			}
			$rows = $wgUser->getOption( 'rows' );
			$cols = $wgUser->getOption( 'cols' );
			$text = "\n<textarea cols='$cols' rows='$rows' readonly='readonly'>" .
				htmlspecialchars( $source ) . "\n</textarea>";
			$this->addHTML( $text );
		}

		$this->returnToMain( false );
	}

function fatalError

	function fatalError( $message ) {
		$this->setPageTitle( wfMsg( "internalerror" ) );
		$this->setRobotpolicy( "noindex,nofollow" );
		$this->setArticleRelated( false );
		$this->enableClientCache( false );
		$this->mRedirect = '';

		$this->mBodytext = $message;
		$this->output();
		wfErrorExit();
	}

function unexpectedValueError

	function unexpectedValueError( $name, $val ) {
		$this->fatalError( wfMsg( 'unexpected', $name, $val ) );
	}

function fileCopyError

	function fileCopyError( $old, $new ) {
		$this->fatalError( wfMsg( 'filecopyerror', $old, $new ) );
	}

function fileRenameError

	function fileRenameError( $old, $new ) {
		$this->fatalError( wfMsg( 'filerenameerror', $old, $new ) );
	}

function fileDeleteError

	function fileDeleteError( $name ) {
		$this->fatalError( wfMsg( 'filedeleteerror', $name ) );
	}

function fileNotFoundError

	function fileNotFoundError( $name ) {
		$this->fatalError( wfMsg( 'filenotfound', $name ) );
	}

function returnToMain

	/**
	 * return from error messages or notes
	 * @param $auto automatically redirect the user after 10 seconds
	 * @param $returnto page title to return to. Default is Main Page.
	 */
	function returnToMain( $auto = true, $returnto = NULL ) {
		global $wgUser, $wgOut, $wgRequest;

		if ( $returnto == NULL ) {
			$returnto = $wgRequest->getText( 'returnto' );
		}
		$returnto = htmlspecialchars( $returnto );

		$sk = $wgUser->getSkin();
		if ( '' == $returnto ) {
			$returnto = wfMsgForContent( 'mainpage' );
		}
		$link = $sk->makeKnownLink( $returnto, '' );

		$r = wfMsg( 'returnto', $link );
		if ( $auto ) {
			$titleObj = Title::newFromText( $returnto );
			$wgOut->addMeta( 'http:Refresh', '10;url=' . $titleObj->escapeFullURL() );
		}
		$wgOut->addHTML( "\n<p>$r</p>\n" );
	}

function addMetaTags

	/**
	 * This function takes the existing and broken links for the page
	 * and uses the first 10 of them for META keywords
	 */
	function addMetaTags () {
		global $wgLinkCache , $wgOut ;
		$good = array_keys ( $wgLinkCache->mGoodLinks ) ;
		$bad = array_keys ( $wgLinkCache->mBadLinks ) ;
		$a = array_merge ( $good , $bad ) ;
		$a = array_slice ( $a , 0 , 10 ) ; # 10 keywords max
		$a = implode ( ',' , $a ) ;
		$strip = array(
			"/<.*?" . ">/" => '',
			"/[_]/" => ' '
		);
		$a = htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),$a ));

		$wgOut->addMeta ( 'KEYWORDS' , $a ) ;
	}

function headElement

	/**
 	 * @private
	 */
	function headElement() {
		global $wgDocType, $wgDTD, $wgContLanguageCode, $wgOutputEncoding, $wgMimeType;
		global $wgUser, $wgContLang, $wgRequest;

		if( $wgMimeType == 'text/xml' || $wgMimeType == 'application/xhtml+xml' || $wgMimeType == 'application/xml' ) {
			$ret = "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?>\n";
		} else {
			$ret = '';
		}

		$ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\"\n        \"$wgDTD\">\n";

		if ( "" == $this->mHTMLtitle ) {
			$this->mHTMLtitle = wfMsg( "pagetitle", $this->mPagetitle );
		}

		$rtl = $wgContLang->isRTL() ? " dir='RTL'" : '';
		$ret .= "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"$wgContLanguageCode\" lang=\"$wgContLanguageCode\" $rtl>\n";
		$ret .= "<head>\n<title>" . htmlspecialchars( $this->mHTMLtitle ) . "</title>\n";
		array_push( $this->mMetatags, array( "http:Content-type", "$wgMimeType; charset={$wgOutputEncoding}" ) );

		$ret .= $this->getHeadLinks();
		global $wgStylePath;
		if( $this->isPrintable() ) {
			$media = '';
		} else {
			$media = "media='print'";
		}
		$printsheet = htmlspecialchars( "$wgStylePath/common/wikiprintable.css" );
		$ret .= "<link rel='stylesheet' type='text/css' $media href='$printsheet' />\n";

		$sk = $wgUser->getSkin();
		$ret .= $sk->getHeadScripts();
		$ret .= $this->mScripts;
		$ret .= $sk->getUserStyles();

		$ret .= "</head>\n";
		return $ret;
	}

function getHeadLinks

	function getHeadLinks() {
		global $wgRequest, $wgStylePath;
		$ret = '';
		foreach ( $this->mMetatags as $tag ) {
			if ( 0 == strcasecmp( 'http:', substr( $tag[0], 0, 5 ) ) ) {
				$a = 'http-equiv';
				$tag[0] = substr( $tag[0], 5 );
			} else {
				$a = 'name';
			}
			$ret .= "<meta $a=\"{$tag[0]}\" content=\"{$tag[1]}\" />\n";
		}
		$p = $this->mRobotpolicy;
		if ( '' == $p ) { $p = 'index,follow'; }
		$ret .= "<meta name=\"robots\" content=\"$p\" />\n";

		if ( count( $this->mKeywords ) > 0 ) {
			$strip = array(
				"/<.*?" . ">/" => '',
				"/[_]/" => ' '
			);
			$ret .= "<meta name=\"keywords\" content=\"" .
			  htmlspecialchars(preg_replace(array_keys($strip), array_values($strip),implode( ",", $this->mKeywords ))) . "\" />\n";
		}
		foreach ( $this->mLinktags as $tag ) {
			$ret .= '<link';
			foreach( $tag as $attr => $val ) {
				$ret .= " $attr=\"" . htmlspecialchars( $val ) . "\"";
			}
			$ret .= " />\n";
		}
		if( $this->isSyndicated() ) {
			# FIXME: centralize the mime-type and name information in Feed.php
			$link = $wgRequest->escapeAppendQuery( 'feed=rss' );
			$ret .= "<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='$link' />\n";
			$link = $wgRequest->escapeAppendQuery( 'feed=atom' );
			$ret .= "<link rel='alternate' type='application/rss+atom' title='Atom 0.3' href='$link' />\n";
		}

		return $ret;
	}

function transformBuffer

	/**
	 * Run any necessary pre-output transformations on the buffer text
	 */
	function transformBuffer( $options = 0 ) {
	}

function rateLimited

	/**
	 * Turn off regular page output and return an error reponse
	 * for when rate limiting has triggered.
	 * @todo: i18n
	 * @access public
	 */
	function rateLimited() {
		global $wgOut;
		$wgOut->disable();
		wfHttpError( 500, 'Internal Server Error',
			'Sorry, the server has encountered an internal error. ' .
			'Please wait a moment and hit "refresh" to submit the request again.' );
	}

}

}

?>