MediaWikiDoc:OutputPage.php

From HypertWiki
Revision as of 19:53, 16 June 2005 by Woozle (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Techniques: MediaWiki: OutputPage.php

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

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 "\n\nRedirect\n\n\n"; print "

Location: $url

\n"; print "\n\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.' );
	}

}

}

?>