/includes/OutputPage.php

<?php

if ( !defined( 'MEDIAWIKI' ) ) {

	die( 1 );

}



/**

 * @todo document

 */

class OutputPage {

	var $mMetatags = array(), $mKeywords = array(), $mLinktags = array();

	var $mExtStyles = array();

	var $mPagetitle = '', $mBodytext = '';



	/**

	 * Holds the debug lines that will be outputted as comments in page source if

	 * $wgDebugComments is enabled. See also $wgShowDebug.

	 * TODO: make a getter method for this

	 */

	public $mDebugtext = '';



	var $mHTMLtitle = '', $mIsarticle = true, $mPrintable = false;

	var $mSubtitle = '', $mRedirect = '', $mStatusCode;

	var $mLastModified = '', $mETag = false;

	var $mCategoryLinks = array(), $mCategories = array(), $mLanguageLinks = array();



	var $mScripts = '', $mInlineStyles = '', $mLinkColours, $mPageLinkTitle = '', $mHeadItems = array();

	var $mModules = array(), $mModuleScripts = array(), $mModuleStyles = array(), $mModuleMessages = array();

	var $mResourceLoader;

	var $mInlineMsg = array();



	var $mTemplateIds = array();



	var $mAllowUserJs;

	var $mSuppressQuickbar = false;

	var $mDoNothing = false;

	var $mContainsOldMagic = 0, $mContainsNewMagic = 0;

	var $mIsArticleRelated = true;

	protected $mParserOptions = null; // lazy initialised, use parserOptions()



	var $mFeedLinks = array();



	var $mEnableClientCache = true;

	var $mArticleBodyOnly = false;



	var $mNewSectionLink = false;

	var $mHideNewSectionLink = false;

	var $mNoGallery = false;

	var $mPageTitleActionText = '';

	var $mParseWarnings = array();

	var $mSquidMaxage = 0;

	var $mPreventClickjacking = true;

	var $mRevisionId = null;

	protected $mTitle = null;



	/**

	 * An array of stylesheet filenames (relative from skins path), with options

	 * for CSS media, IE conditions, and RTL/LTR direction.

	 * For internal use; add settings in the skin via $this->addStyle()

	 */

	var $styles = array();



	/**

	 * Whether to load jQuery core.

	 */

	protected $mJQueryDone = false;



	private $mIndexPolicy = 'index';

	private $mFollowPolicy = 'follow';

	private $mVaryHeader = array(

		'Accept-Encoding' => array( 'list-contains=gzip' ),

		'Cookie' => null

	);



	/**

	 * Constructor

	 * Initialise private variables

	 */

	function __construct() {

		global $wgAllowUserJs;

		$this->mAllowUserJs = $wgAllowUserJs;

	}



	/**

	 * Redirect to $url rather than displaying the normal page

	 *

	 * @param $url String: URL

	 * @param $responsecode String: HTTP status code

	 */

	public function redirect( $url, $responsecode = '302' ) {

		# Strip newlines as a paranoia check for header injection in PHP<5.1.2

		$this->mRedirect = str_replace( "\n", '', $url );

		$this->mRedirectCode = $responsecode;

	}



	/**

	 * Get the URL to redirect to, or an empty string if not redirect URL set

	 *

	 * @return String

	 */

	public function getRedirect() {

		return $this->mRedirect;

	}



	/**

	 * Set the HTTP status code to send with the output.

	 *

	 * @param $statusCode Integer

	 * @return nothing

	 */

	public function setStatusCode( $statusCode ) {

		$this->mStatusCode = $statusCode;

	}



	/**

	 * Add a new <meta> tag

	 * To add an http-equiv meta tag, precede the name with "http:"

	 *

	 * @param $name tag name

	 * @param $val tag value

	 */

	function addMeta( $name, $val ) {

		array_push( $this->mMetatags, array( $name, $val ) );

	}



	/**

	 * Add a keyword or a list of keywords in the page header

	 *

	 * @param $text String or array of strings

	 */

	function addKeyword( $text ) {

		if( is_array( $text ) ) {

			$this->mKeywords = array_merge( $this->mKeywords, $text );

		} else {

			array_push( $this->mKeywords, $text );

		}

	}



	/**

	 * Add a new \<link\> tag to the page header

	 *

	 * @param $linkarr Array: associative array of attributes.

	 */

	function addLink( $linkarr ) {

		array_push( $this->mLinktags, $linkarr );

	}



	/**

	 * Add a new \<link\> with "rel" attribute set to "meta"

	 *

	 * @param $linkarr Array: associative array mapping attribute names to their

	 *                 values, both keys and values will be escaped, and the

	 *                 "rel" attribute will be automatically added

	 */

	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;

	}



	/**

	 * Add raw HTML to the list of scripts (including \<script\> tag, etc.)

	 *

	 * @param $script String: raw HTML

	 */

	function addScript( $script ) {

		$this->mScripts .= $script . "\n";

	}



	/**

	 * Register and add a stylesheet from an extension directory.

	 *

	 * @param $url String path to sheet.  Provide either a full url (beginning

	 *             with 'http', etc) or a relative path from the document root

	 *             (beginning with '/').  Otherwise it behaves identically to

	 *             addStyle() and draws from the /skins folder.

	 */

	public function addExtensionStyle( $url ) {

		array_push( $this->mExtStyles, $url );

	}



	/**

	 * Get all links added by extensions

	 *

	 * @return Array

	 */

	function getExtStyle() {

		return $this->mExtStyles;

	}



	/**

	 * Add a JavaScript file out of skins/common, or a given relative path.

	 *

	 * @param $file String: filename in skins/common or complete on-server path

	 *              (/foo/bar.js)

	 * @param $version String: style version of the file. Defaults to $wgStyleVersion

	 */

	public function addScriptFile( $file, $version = null ) {

		global $wgStylePath, $wgStyleVersion;

		// See if $file parameter is an absolute URL or begins with a slash

		if( substr( $file, 0, 1 ) == '/' || preg_match( '#^[a-z]*://#i', $file ) ) {

			$path = $file;

		} else {

			$path = "{$wgStylePath}/common/{$file}";

		}

		if ( is_null( $version ) )

			$version = $wgStyleVersion;

		$this->addScript( Html::linkedScript( wfAppendQuery( $path, $version ) ) );

	}



	/**

	 * Add a self-contained script tag with the given contents

	 *

	 * @param $script String: JavaScript text, no <script> tags

	 */

	public function addInlineScript( $script ) {

		$this->mScripts .= Html::inlineScript( "\n$script\n" ) . "\n";

	}



	/**

	 * Get all registered JS and CSS tags for the header.

	 *

	 * @return String

	 */

	function getScript() {

		return $this->mScripts . $this->getHeadItems();

	}



	/**

	 * Get the list of modules to include on this page

	 *

	 * @return Array of module names

	 */

	public function getModules() {

		return array_values( array_unique( $this->mModules ) );

	}



	/**

	 * Add one or more modules recognized by the resource loader. Modules added

	 * through this function will be loaded by the resource loader when the

	 * page loads.

	 *

	 * @param $modules Mixed: module name (string) or array of module names

	 */

	public function addModules( $modules ) {

		$this->mModules = array_merge( $this->mModules, (array)$modules );

	}



	/**

	 * Get the list of module JS to include on this page

	 * @return array of module names

	 */

	public function getModuleScripts() {

		return array_values( array_unique( $this->mModuleScripts ) );

	}



	/**

	 * Add only JS of one or more modules recognized by the resource loader. Module

	 * scripts added through this function will be loaded by the resource loader when

	 * the page loads.

	 *

	 * @param $modules Mixed: module name (string) or array of module names

	 */

	public function addModuleScripts( $modules ) {

		$this->mModuleScripts = array_merge( $this->mModuleScripts, (array)$modules );

	}



	/**

	 * Get the list of module CSS to include on this page

	 *

	 * @return Array of module names

	 */

	public function getModuleStyles() {

		return array_values( array_unique( $this->mModuleStyles ) );

	}



	/**

	 * Add only CSS of one or more modules recognized by the resource loader. Module

	 * styles added through this function will be loaded by the resource loader when

	 * the page loads.

	 *

	 * @param $modules Mixed: module name (string) or array of module names

	 */

	public function addModuleStyles( $modules ) {

		$this->mModuleStyles = array_merge( $this->mModuleStyles, (array)$modules );

	}



	/**

	 * Get the list of module messages to include on this page

	 *

	 * @return Array of module names

	 */

	public function getModuleMessages() {

		return array_values( array_unique( $this->mModuleMessages ) );

	}



	/**

	 * Add only messages of one or more modules recognized by the resource loader.

	 * Module messages added through this function will be loaded by the resource

	 * loader when the page loads.

	 *

	 * @param $modules Mixed: module name (string) or array of module names

	 */

	public function addModuleMessages( $modules ) {

		$this->mModuleMessages = array_merge( $this->mModuleMessages, (array)$modules );

	}



	/**

	 * Get all header items in a string

	 *

	 * @return String

	 */

	function getHeadItems() {

		$s = '';

		foreach ( $this->mHeadItems as $item ) {

			$s .= $item;

		}

		return $s;

	}



	/**

	 * Add or replace an header item to the output

	 *

	 * @param $name String: item name

	 * @param $value String: raw HTML

	 */

	public function addHeadItem( $name, $value ) {

		$this->mHeadItems[$name] = $value;

	}



	/**

	 * Check if the header item $name is already set

	 *

	 * @param $name String: item name

	 * @return Boolean

	 */

	public function hasHeadItem( $name ) {

		return isset( $this->mHeadItems[$name] );

	}



	/**

	 * Set the value of the ETag HTTP header, only used if $wgUseETag is true

	 *

	 * @param $tag String: value of "ETag" header

	 */

	function setETag( $tag ) {

		$this->mETag = $tag;

	}



	/**

	 * Set whether the output should only contain the body of the article,

	 * without any skin, sidebar, etc.

	 * Used e.g. when calling with "action=render".

	 *

	 * @param $only Boolean: whether to output only the body of the article

	 */

	public function setArticleBodyOnly( $only ) {

		$this->mArticleBodyOnly = $only;

	}



	/**

	 * Return whether the output will contain only the body of the article

	 *

	 * @return Boolean

	 */

	public function getArticleBodyOnly() {

		return $this->mArticleBodyOnly;

	}



	/**

	 * 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.

	 *

	 * Side effect: sets mLastModified for Last-Modified header

	 *

	 * @return Boolean: true iff cache-ok headers was sent.

	 */

	public function checkLastModified( $timestamp ) {

		global $wgCachePages, $wgCacheEpoch, $wgUser, $wgRequest;



		if ( !$timestamp || $timestamp == '19700101000000' ) {

			wfDebug( __METHOD__ . ": CACHE DISABLED, NO TIMESTAMP\n" );

			return false;

		}

		if( !$wgCachePages ) {

			wfDebug( __METHOD__ . ": CACHE DISABLED\n", false );

			return false;

		}

		if( $wgUser->getOption( 'nocache' ) ) {

			wfDebug( __METHOD__ . ": USER DISABLED CACHE\n", false );

			return false;

		}



		$timestamp = wfTimestamp( TS_MW, $timestamp );

		$modifiedTimes = array(

			'page' => $timestamp,

			'user' => $wgUser->getTouched(),

			'epoch' => $wgCacheEpoch

		);

		wfRunHooks( 'OutputPageCheckLastModified', array( &$modifiedTimes ) );



		$maxModified = max( $modifiedTimes );

		$this->mLastModified = wfTimestamp( TS_RFC2822, $maxModified );



		if( empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {

			wfDebug( __METHOD__ . ": client did not send If-Modified-Since header\n", false );

			return false;

		}



		# Make debug info

		$info = '';

		foreach ( $modifiedTimes as $name => $value ) {

			if ( $info !== '' ) {

				$info .= ', ';

			}

			$info .= "$name=" . wfTimestamp( TS_ISO_8601, $value );

		}



		# IE sends sizes after the date like this:

		# Wed, 20 Aug 2003 06:51:19 GMT; length=5202

		# this breaks strtotime().

		$clientHeader = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );



		wfSuppressWarnings(); // E_STRICT system time bitching

		$clientHeaderTime = strtotime( $clientHeader );

		wfRestoreWarnings();

		if ( !$clientHeaderTime ) {

			wfDebug( __METHOD__ . ": unable to parse the client's If-Modified-Since header: $clientHeader\n" );

			return false;

		}

		$clientHeaderTime = wfTimestamp( TS_MW, $clientHeaderTime );



		wfDebug( __METHOD__ . ": client sent If-Modified-Since: " .

			wfTimestamp( TS_ISO_8601, $clientHeaderTime ) . "\n", false );

		wfDebug( __METHOD__ . ": effective Last-Modified: " .

			wfTimestamp( TS_ISO_8601, $maxModified ) . "\n", false );

		if( $clientHeaderTime < $maxModified ) {

			wfDebug( __METHOD__ . ": STALE, $info\n", false );

			return false;

		}



		# Not modified

		# Give a 304 response code and disable body output

		wfDebug( __METHOD__ . ": NOT MODIFIED, $info\n", false );

		ini_set( 'zlib.output_compression', 0 );

		$wgRequest->response()->header( "HTTP/1.1 304 Not Modified" );

		$this->sendCacheControl();

		$this->disable();



		// Don't output a compressed blob when using ob_gzhandler;

		// it's technically against HTTP spec and seems to confuse

		// Firefox when the response gets split over two packets.

		wfClearOutputBuffers();



		return true;

	}



	/**

	 * Override the last modified timestamp

	 *

	 * @param $timestamp String: new timestamp, in a format readable by

	 *        wfTimestamp()

	 */

	public function setLastModified( $timestamp ) {

		$this->mLastModified = wfTimestamp( TS_RFC2822, $timestamp );

	}



	/**

	 * Set the robot policy for the page: <http://www.robotstxt.org/meta.html>

	 *

	 * @param $policy String: the literal string to output as the contents of

	 *   the meta tag.  Will be parsed according to the spec and output in

	 *   standardized form.

	 * @return null

	 */

	public function setRobotPolicy( $policy ) {

		$policy = Article::formatRobotPolicy( $policy );



		if( isset( $policy['index'] ) ) {

			$this->setIndexPolicy( $policy['index'] );

		}

		if( isset( $policy['follow'] ) ) {

			$this->setFollowPolicy( $policy['follow'] );

		}

	}



	/**

	 * Set the index policy for the page, but leave the follow policy un-

	 * touched.

	 *

	 * @param $policy string Either 'index' or 'noindex'.

	 * @return null

	 */

	public function setIndexPolicy( $policy ) {

		$policy = trim( $policy );

		if( in_array( $policy, array( 'index', 'noindex' ) ) ) {

			$this->mIndexPolicy = $policy;

		}

	}



	/**

	 * Set the follow policy for the page, but leave the index policy un-

	 * touched.

	 *

	 * @param $policy String: either 'follow' or 'nofollow'.

	 * @return null

	 */

	public function setFollowPolicy( $policy ) {

		$policy = trim( $policy );

		if( in_array( $policy, array( 'follow', 'nofollow' ) ) ) {

			$this->mFollowPolicy = $policy;

		}

	}



	/**

	 * Set the new value of the "action text", this will be added to the

	 * "HTML title", separated from it with " - ".

	 *

	 * @param $text String: new value of the "action text"

	 */

	public function setPageTitleActionText( $text ) {

		$this->mPageTitleActionText = $text;

	}



	/**

	 * Get the value of the "action text"

	 *

	 * @return String

	 */

	public function getPageTitleActionText() {

		if ( isset( $this->mPageTitleActionText ) ) {

			return $this->mPageTitleActionText;

		}

	}



	/**

	 * "HTML title" means the contents of <title>.

	 * It is stored as plain, unescaped text and will be run through htmlspecialchars in the skin file.

	 */

	public function setHTMLTitle( $name ) {

		$this->mHTMLtitle = $name;

	}



	/**

	 * Return the "HTML title", i.e. the content of the <title> tag.

	 *

	 * @return String

	 */

	public function getHTMLTitle() {

		return $this->mHTMLtitle;

	}



	/**

	 * "Page title" means the contents of \<h1\>. It is stored as a valid HTML fragment.

	 * This function allows good tags like \<sup\> in the \<h1\> tag, but not bad tags like \<script\>.

	 * This function automatically sets \<title\> to the same content as \<h1\> but with all tags removed.

	 * Bad tags that were escaped in \<h1\> will still be escaped in \<title\>, and good tags like \<i\> will be dropped entirely.

	 */

	public function setPageTitle( $name ) {

		# change "<script>foo&bar</script>" to "&lt;script&gt;foo&amp;bar&lt;/script&gt;"

		# but leave "<i>foobar</i>" alone

		$nameWithTags = Sanitizer::normalizeCharReferences( Sanitizer::removeHTMLtags( $name ) );

		$this->mPagetitle = $nameWithTags;



		# change "<i>foo&amp;bar</i>" to "foo&bar"

		$this->setHTMLTitle( wfMsg( 'pagetitle', Sanitizer::stripAllTags( $nameWithTags ) ) );

	}



	/**

	 * Return the "page title", i.e. the content of the \<h1\> tag.

	 *

	 * @return String

	 */

	public function getPageTitle() {

		return $this->mPagetitle;

	}



	/**

	 * Set the Title object to use

	 *

	 * @param $t Title object

	 */

	public function setTitle( $t ) {

		$this->mTitle = $t;

	}



	/**

	 * Get the Title object used in this instance

	 *

	 * @return Title

	 */

	public function getTitle() {

		if ( $this->mTitle instanceof Title ) {

			return $this->mTitle;

		} else {

			wfDebug( __METHOD__ . " called and \$mTitle is null. Return \$wgTitle for sanity\n" );

			global $wgTitle;

			return $wgTitle;

		}

	}



	/**

	 * Replace the subtile with $str

	 *

	 * @param $str String: new value of the subtitle

	 */

	public function setSubtitle( $str ) {

		$this->mSubtitle = /*$this->parse(*/ $str /*)*/; // @bug 2514

	}



	/**

	 * Add $str to the subtitle

	 *

	 * @param $str String to add to the subtitle

	 */

	public function appendSubtitle( $str ) {

		$this->mSubtitle .= /*$this->parse(*/ $str /*)*/; // @bug 2514

	}



	/**

	 * Get the subtitle

	 *

	 * @return String

	 */

	public function getSubtitle() {

		return $this->mSubtitle;

	}



	/**

	 * Set the page as printable, i.e. it'll be displayed with with all

	 * print styles included

	 */

	public function setPrintable() {

		$this->mPrintable = true;

	}



	/**

	 * Return whether the page is "printable"

	 *

	 * @return Boolean

	 */

	public function isPrintable() {

		return $this->mPrintable;

	}



	/**

	 * Disable output completely, i.e. calling output() will have no effect

	 */

	public function disable() {

		$this->mDoNothing = true;

	}



	/**

	 * Return whether the output will be completely disabled

	 *

	 * @return Boolean

	 */

	public function isDisabled() {

		return $this->mDoNothing;

	}



	/**

	 * Show an "add new section" link?

	 *

	 * @return Boolean

	 */

	public function showNewSectionLink() {

		return $this->mNewSectionLink;

	}



	/**

	 * Forcibly hide the new section link?

	 *

	 * @return Boolean

	 */

	public function forceHideNewSectionLink() {

		return $this->mHideNewSectionLink;

	}



	/**

	 * Add or remove feed links in the page header

	 * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()

	 * for the new version

	 * @see addFeedLink()

	 *

	 * @param $show Boolean: true: add default feeds, false: remove all feeds

	 */

	public function setSyndicated( $show = true ) {

		if ( $show ) {

			$this->setFeedAppendQuery( false );

		} else {

			$this->mFeedLinks = array();

		}

	}



	/**

	 * Add default feeds to the page header

	 * This is mainly kept for backward compatibility, see OutputPage::addFeedLink()

	 * for the new version

	 * @see addFeedLink()

	 *

	 * @param $val String: query to append to feed links or false to output

	 *        default links

	 */

	public function setFeedAppendQuery( $val ) {

		global $wgAdvertisedFeedTypes;



		$this->mFeedLinks = array();



		foreach ( $wgAdvertisedFeedTypes as $type ) {

			$query = "feed=$type";

			if ( is_string( $val ) ) {

				$query .= '&' . $val;

			}

			$this->mFeedLinks[$type] = $this->getTitle()->getLocalURL( $query );

		}

	}



	/**

	 * Add a feed link to the page header

	 *

	 * @param $format String: feed type, should be a key of $wgFeedClasses

	 * @param $href String: URL

	 */

	public function addFeedLink( $format, $href ) {

		global $wgAdvertisedFeedTypes;



		if ( in_array( $format, $wgAdvertisedFeedTypes ) ) {

			$this->mFeedLinks[$format] = $href;

		}

	}



	/**

	 * Should we output feed links for this page?

	 * @return Boolean

	 */

	public function isSyndicated() {

		return count( $this->mFeedLinks ) > 0;

	}



	/**

	 * Return URLs for each supported syndication format for this page.

	 * @return array associating format keys with URLs

	 */

	public function getSyndicationLinks() {

		return $this->mFeedLinks;

	}



	/**

	 * Will currently always return null

	 *

	 * @return null

	 */

	public function getFeedAppendQuery() {

		return $this->mFeedLinksAppendQuery;

	}



	/**

	 * Set whether the displayed content is related to the source of the

	 * corresponding article on the wiki

	 * Setting true will cause the change "article related" toggle to true

	 *

	 * @param $v Boolean

	 */

	public function setArticleFlag( $v ) {

		$this->mIsarticle = $v;

		if ( $v ) {

			$this->mIsArticleRelated = $v;

		}

	}



	/**

	 * Return whether the content displayed page is related to the source of

	 * the corresponding article on the wiki

	 *

	 * @return Boolean

	 */

	public function isArticle() {

		return $this->mIsarticle;

	}



	/**

	 * Set whether this page is related an article on the wiki

	 * Setting false will cause the change of "article flag" toggle to false

	 *

	 * @param $v Boolean

	 */

	public function setArticleRelated( $v ) {

		$this->mIsArticleRelated = $v;

		if ( !$v ) {

			$this->mIsarticle = false;

		}

	}



	/**

	 * Return whether this page is related an article on the wiki

	 *

	 * @return Boolean

	 */

	public function isArticleRelated() {

		return $this->mIsArticleRelated;

	}



	/**

	 * Add new language links

	 *

	 * @param $newLinkArray Associative array mapping language code to the page

	 *                      name

	 */

	public function addLanguageLinks( $newLinkArray ) {

		$this->mLanguageLinks += $newLinkArray;

	}



	/**

	 * Reset the language links and add new language links

	 *

	 * @param $newLinkArray Associative array mapping language code to the page

	 *                      name

	 */

	public function setLanguageLinks( $newLinkArray ) {

		$this->mLanguageLinks = $newLinkArray;

	}



	/**

	 * Get the list of language links

	 *

	 * @return Associative array mapping language code to the page name

	 */

	public function getLanguageLinks() {

		return $this->mLanguageLinks;

	}



	/**

	 * Add an array of categories, with names in the keys

	 *

	 * @param $categories Associative array mapping category name to its sort key

	 */

	public function addCategoryLinks( $categories ) {

		global $wgUser, $wgContLang;



		if ( !is_array( $categories ) || count( $categories ) == 0 ) {

			return;

		}



		# Add the links to a LinkBatch

		$arr = array( NS_CATEGORY => $categories );

		$lb = new LinkBatch;

		$lb->setArray( $arr );



		# Fetch existence plus the hiddencat property

		$dbr = wfGetDB( DB_SLAVE );

		$pageTable = $dbr->tableName( 'page' );

		$where = $lb->constructSet( 'page', $dbr );

		$propsTable = $dbr->tableName( 'page_props' );

		$sql = "SELECT page_id, page_namespace, page_title, page_len, page_is_redirect, page_latest, pp_value

			FROM $pageTable LEFT JOIN $propsTable ON pp_propname='hiddencat' AND pp_page=page_id WHERE $where";

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



		# Add the results to the link cache

		$lb->addResultToCache( LinkCache::singleton(), $res );



		# Set all the values to 'normal'. This can be done with array_fill_keys in PHP 5.2.0+

		$categories = array_combine(

			array_keys( $categories ),

			array_fill( 0, count( $categories ), 'normal' )

		);



		# Mark hidden categories

		foreach ( $res as $row ) {

			if ( isset( $row->pp_value ) ) {

				$categories[$row->page_title] = 'hidden';

			}

		}



		# Add the remaining categories to the skin

		if ( wfRunHooks( 'OutputPageMakeCategoryLinks', array( &$this, $categories, &$this->mCategoryLinks ) ) ) {

			$sk = $wgUser->getSkin();

			foreach ( $categories as $category => $type ) {

				$origcategory = $category;

				$title = Title::makeTitleSafe( NS_CATEGORY, $category );

				$wgContLang->findVariantLink( $category, $title, true );

				if ( $category != $origcategory ) {

					if ( array_key_exists( $category, $categories ) ) {

						continue;

					}

				}

				$text = $wgContLang->convertHtml( $title->getText() );

				$this->mCategories[] = $title->getText();

				$this->mCategoryLinks[$type][] = $sk->link( $title, $text );

			}

		}

	}



	/**

	 * Reset the category links (but not the category list) and add $categories

	 *

	 * @param $categories Associative array mapping category name to its sort key

	 */

	public function setCategoryLinks( $categories ) {

		$this->mCategoryLinks = array();

		$this->addCategoryLinks( $categories );

	}



	/**

	 * Get the list of category links, in a 2-D array with the following format:

	 * $arr[$type][] = $link, where $type is either "normal" or "hidden" (for

	 * hidden categories) and $link a HTML fragment with a link to the category

	 * page

	 *

	 * @return Array

	 */

	public function getCategoryLinks() {

		return $this->mCategoryLinks;

	}



	/**

	 * Get the list of category names this page belongs to

	 *

	 * @return Array of strings

	 */

	public function getCategories() {

		return $this->mCategories;

	}



	/**

	 * Suppress the quickbar from the output, only for skin supporting

	 * the quickbar

	 */

	public function suppressQuickbar() {

		$this->mSuppressQuickbar = true;

	}



	/**

	 * Return whether the quickbar should be suppressed from the output

	 *

	 * @return Boolean

	 */

	public function isQuickbarSuppressed() {

		return $this->mSuppressQuickbar;

	}



	/**

	 * Remove user JavaScript from scripts to load

	 */

	public function disallowUserJs() {

		$this->mAllowUserJs = false;

	}



	/**

	 * Return whether user JavaScript is allowed for this page

	 *

	 * @return Boolean

	 */

	public function isUserJsAllowed() {

		return $this->mAllowUserJs;

	}



	/**

	 * Prepend $text to the body HTML

	 *

	 * @param $text String: HTML

	 */

	public function prependHTML( $text ) {

		$this->mBodytext = $text . $this->mBodytext;

	}



	/**

	 * Append $text to the body HTML

	 *

	 * @param $text String: HTML

	 */

	public function addHTML( $text ) {

		$this->mBodytext .= $text;

	}



	/**

	 * Clear the body HTML

	 */

	public function clearHTML() {

		$this->mBodytext = '';

	}



	/**

	 * Get the body HTML

	 *

	 * @return String: HTML

	 */

	public function getHTML() {

		return $this->mBodytext;

	}



	/**

	 * Add $text to the debug output

	 *

	 * @param $text String: debug text

	 */

	public function debug( $text ) {

		$this->mDebugtext .= $text;

	}



	/**

	 * @deprecated use parserOptions() instead

	 */

	public function setParserOptions( $options ) {

		wfDeprecated( __METHOD__ );

		return $this->parserOptions( $options );

	}



	/**

	 * Get/set the ParserOptions object to use for wikitext parsing

	 *

	 * @param $options either the ParserOption to use or null to only get the

	 *                 current ParserOption object

	 * @return current ParserOption object

	 */

	public function parserOptions( $options = null ) {

		if ( !$this->mParserOptions ) {

			$this->mParserOptions = new ParserOptions;

		}

		return wfSetVar( $this->mParserOptions, $options );

	}



	/**

	 * Set the revision ID which will be seen by the wiki text parser

	 * for things such as embedded {{REVISIONID}} variable use.

	 *

	 * @param $revid Mixed: an positive integer, or null

	 * @return Mixed: previous value

	 */

	public function setRevisionId( $revid ) {

		$val = is_null( $revid ) ? null : intval( $revid );

		return wfSetVar( $this->mRevisionId, $val );

	}



	/**

	 * Get the current revision ID

	 *

	 * @return Integer

	 */

	public function getRevisionId() {

		return $this->mRevisionId;

	}



	/**

	 * Convert wikitext to HTML and add it to the buffer

	 * Default assumes that the current page title will be used.

	 *

	 * @param $text String

	 * @param $linestart Boolean: is this the start of a line?

	 */

	public function addWikiText( $text, $linestart = true ) {

		$title = $this->getTitle(); // Work arround E_STRICT

		$this->addWikiTextTitle( $text, $title, $linestart );

	}



	/**

	 * Add wikitext with a custom Title object

	 *

	 * @param $text String: wikitext

	 * @param $title Title object

	 * @param $linestart Boolean: is this the start of a line?

	 */

	public function addWikiTextWithTitle( $text, &$title, $linestart = true ) {

		$this->addWikiTextTitle( $text, $title, $linestart );

	}



	/**

	 * Add wikitext with a custom Title object and

	 *

	 * @param $text String: wikitext

	 * @param $title Title object

	 * @param $linestart Boolean: is this the start of a line?

	 */

	function addWikiTextTitleTidy( $text, &$title, $linestart = true ) {

		$this->addWikiTextTitle( $text, $title, $linestart, true );

	}



	/**

	 * Add wikitext with tidy enabled

	 *

	 * @param $text String: wikitext

	 * @param $linestart Boolean: is this the start of a line?

	 */

	public function addWikiTextTidy( $text, $linestart = true ) {

		$title = $this->getTitle();

		$this->addWikiTextTitleTidy( $text, $title, $linestart );

	}



	/**

	 * Add wikitext with a custom Title object

	 *

	 * @param $text String: wikitext

	 * @param $title Title object

	 * @param $linestart Boolean: is this the start of a line?

	 * @param $tidy Boolean: whether to use tidy

	 */

	public function addWikiTextTitle( $text, &$title, $linestart, $tidy = false ) {

		global $wgParser;



		wfProfileIn( __METHOD__ );



		wfIncrStats( 'pcache_not_possible' );



		$popts = $this->parserOptions();

		$oldTidy = $popts->setTidy( $tidy );



		$parserOutput = $wgParser->parse(

			$text, $title, $popts,

			$linestart, true, $this->mRevisionId

		);



		$popts->setTidy( $oldTidy );



		$this->addParserOutput( $parserOutput );



		wfProfileOut( __METHOD__ );

	}



	/**

	 * 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.

	 *

	 * @param $text String: wikitext

	 * @param $article Article object

	 * @param $cache Boolean

	 * @deprecated Use Article::outputWikitext

	 */

	public function addPrimaryWikiText( $text, $article, $cache = true ) {

		global $wgParser;



		wfDeprecated( __METHOD__ );



		$popts = $this->parserOptions();

		$popts->setTidy( true );

		$parserOutput = $wgParser->parse(

			$text, $article->mTitle,

			$popts, true, true, $this->mRevisionId

		);

		$popts->setTidy( false );

		if ( $cache && $article && $parserOutput->isCacheable() ) {

			$parserCache = ParserCache::singleton();

			$parserCache->save( $parserOutput, $article, $popts );

		}



		$this->addParserOutput( $parserOutput );

	}



	/**

	 * @deprecated use addWikiTextTidy()

	 */

	public function addSecondaryWikiText( $text, $linestart = true ) {

		wfDeprecated( __METHOD__ );

		$this->addWikiTextTitleTidy( $text, $this->getTitle(), $linestart );

	}



	/**

	 * Add a ParserOutput object, but without Html

	 *

	 * @param $parserOutput ParserOutput object

	 */

	public function addParserOutputNoText( &$parserOutput ) {

		$this->mLanguageLinks += $parserOutput->getLanguageLinks();

		$this->addCategoryLinks( $parserOutput->getCategories() );

		$this->mNewSectionLink = $parserOutput->getNewSection();

		$this->mHideNewSectionLink = $parserOutput->getHideNewSection();



		$this->mParseWarnings = $parserOutput->getWarnings();

		if ( !$parserOutput->isCacheable() ) {

			$this->enableClientCache( false );

		}

		$this->mNoGallery = $parserOutput->getNoGallery();

		$this->mHeadItems = array_merge( $this->mHeadItems, $parserOutput->getHeadItems() );

		$this->addModules( $parserOutput->getModules() );

		// Versioning...

		foreach ( (array)$parserOutput->mTemplateIds as $ns => $dbks ) {

			if ( isset( $this->mTemplateIds[$ns] ) ) {

				$this->mTemplateIds[$ns] = $dbks + $this->mTemplateIds[$ns];

			} else {

				$this->mTemplateIds[$ns] = $dbks;

			}

		}



		// Hooks registered in the object

		global $wgParserOutputHooks;

		foreach ( $parserOutput->getOutputHooks() as $hookInfo ) {

			list( $hookName, $data ) = $hookInfo;

			if ( isset( $wgParserOutputHooks[$hookName] ) ) {

				call_user_func( $wgParserOutputHooks[$hookName], $this, $parserOutput, $data );

			}

		}



		wfRunHooks( 'OutputPageParserOutput', array( &$this, $parserOutput ) );

	}



	/**

	 * Add a ParserOutput object

	 *

	 * @param $parserOutput ParserOutput

	 */

	function addParserOutput( &$parserOutput ) {

		$this->addParserOutputNoText( $parserOutput );

		$text = $parserOutput->getText();

		wfRunHooks( 'OutputPageBeforeHTML', array( &$this, &$text ) );

		$this->addHTML( $text );

	}





	/**

	 * Add the output of a QuickTemplate to the output buffer

	 *

	 * @param $template QuickTemplate

	 */

	public function addTemplate( &$template ) {

		ob_start();

		$template->execute();

		$this->addHTML( ob_get_contents() );

		ob_end_clean();

	}



	/**

	 * Parse wikitext and return the HTML.

	 *

	 * @param $text String

	 * @param $linestart Boolean: is this the start of a line?

	 * @param $interface Boolean: use interface language ($wgLang instead of

	 *                   $wgContLang) while parsing language sensitive magic

	 *                   words like GRAMMAR and PLURAL

	 * @return String: HTML

	 */

	public function parse( $text, $linestart = true, $interface = false ) {

		global $wgParser;

		if( is_null( $this->getTitle() ) ) {

			throw new MWException( 'Empty $mTitle in ' . __METHOD__ );

		}

		$popts = $this->parserOptions();

		if ( $interface ) {

			$popts->setInterfaceMessage( true );

		}

		$parserOutput = $wgParser->parse(

			$text, $this->getTitle(), $popts,

			$linestart, true, $this->mRevisionId

		);

		if ( $interface ) {

			$popts->setInterfaceMessage( false );

		}

		return $parserOutput->getText();

	}



	/**

	 * Parse wikitext, strip paragraphs, and return the HTML.

	 *

	 * @param $text String

	 * @param $linestart Boolean: is this the start of a line?

	 * @param $interface Boolean: use interface language ($wgLang instead of

	 *                   $wgContLang) while parsing language sensitive magic

	 *                   words like GRAMMAR and PLURAL

	 * @return String: HTML

	 */

	public function parseInline( $text, $linestart = true, $interface = false ) {

		$parsed = $this->parse( $text, $linestart, $interface );



		$m = array();

		if ( preg_match( '/^<p>(.*)\n?<\/p>\n?/sU', $parsed, $m ) ) {

			$parsed = $m[1];

		}



		return $parsed;

	}



	/**

	 * @deprecated

	 *

	 * @param $article Article

	 * @return Boolean: true if successful, else false.

	 */

	public function tryParserCache( &$article ) {

		wfDeprecated( __METHOD__ );

		$parserOutput = ParserCache::singleton()->get( $article, $article->getParserOptions() );



		if ( $parserOutput !== false ) {

			$this->addParserOutput( $parserOutput );

			return true;

		} else {

			return false;

		}

	}



	/**

	 * Set the value of the "s-maxage" part of the "Cache-control" HTTP header

	 *

	 * @param $maxage Integer: maximum cache time on the Squid, in seconds.

	 */

	public function setSquidMaxage( $maxage ) {

		$this->mSquidMaxage = $maxage;

	}



	/**

	 * Use enableClientCache(false) to force it to send nocache headers

	 *

	 * @param $state ??

	 */

	public function enableClientCache( $state ) {

		return wfSetVar( $this->mEnableClientCache, $state );

	}



	/**

	 * Get the list of cookies that will influence on the cache

	 *

	 * @return Array

	 */

	function getCacheVaryCookies() {

		global $wgCookiePrefix, $wgCacheVaryCookies;

		static $cookies;

		if ( $cookies === null ) {

			$cookies = array_merge(

				array(

					"{$wgCookiePrefix}Token",

					"{$wgCookiePrefix}LoggedOut",

					session_name()

				),

				$wgCacheVaryCookies

			);

			wfRunHooks( 'GetCacheVaryCookies', array( $this, &$cookies ) );

		}

		return $cookies;

	}



	/**

	 * Return whether this page is not cacheable because "useskin" or "uselang"

	 * URL parameters were passed.

	 *

	 * @return Boolean

	 */

	function uncacheableBecauseRequestVars() {

		global $wgRequest;

		return $wgRequest->getText( 'useskin', false ) === false

			&& $wgRequest->getText( 'uselang', false ) === false;

	}



	/**

	 * Check if the request has a cache-varying cookie header

	 * If it does, it's very important that we don't allow public caching

	 *

	 * @return Boolean

	 */

	function haveCacheVaryCookies() {

		global $wgRequest;

		$cookieHeader = $wgRequest->getHeader( 'cookie' );

		if ( $cookieHeader === false ) {

			return false;

		}

		$cvCookies = $this->getCacheVaryCookies();

		foreach ( $cvCookies as $cookieName ) {

			# Check for a simple string match, like the way squid does it

			if ( strpos( $cookieHeader, $cookieName ) !== false ) {

				wfDebug( __METHOD__ . ": found $cookieName\n" );

				return true;

			}

		}

		wfDebug( __METHOD__ . ": no cache-varying cookies found\n" );

		return false;

	}



	/**

	 * Add an HTTP header that will influence on the cache

	 *

	 * @param $header String: header name

	 * @param $option either an Array or null

	 * @fixme Document the $option parameter; it appears to be for

	 *        X-Vary-Options but what format is acceptable?

	 */

	public function addVaryHeader( $header, $option = null ) {

		if ( !array_key_exists( $header, $this->mVaryHeader ) ) {

			$this->mVaryHeader[$header] = (array)$option;

		} elseif( is_array( $option ) ) {

			if( is_array( $this->mVaryHeader[$header] ) ) {

				$this->mVaryHeader[$header] = array_merge( $this->mVaryHeader[$header], $option );

			} else {

				$this->mVaryHeader[$header] = $option;

			}

		}

		$this->mVaryHeader[$header] = array_unique( $this->mVaryHeader[$header] );

	}



	/**

	 * Get a complete X-Vary-Options header

	 *

	 * @return String

	 */

	public function getXVO() {

		$cvCookies = $this->getCacheVaryCookies();



		$cookiesOption = array();

		foreach ( $cvCookies as $cookieName ) {

			$cookiesOption[] = 'string-contains=' . $cookieName;

		}

		$this->addVaryHeader( 'Cookie', $cookiesOption );



		$headers = array();

		foreach( $this->mVaryHeader as $header => $option ) {

			$newheader = $header;

			if( is_array( $option ) ) {

				$newheader .= ';' . implode( ';', $option );

			}

			$headers[] = $newheader;

		}

		$xvo = 'X-Vary-Options: ' . implode( ',', $headers );



		return $xvo;

	}



	/**

	 * bug 21672: Add Accept-Language to Vary and XVO headers

	 * if there's no 'variant' parameter existed in GET.

	 *

	 * For example:

	 *   /w/index.php?title=Main_page should always be served; but

	 *   /w/index.php?title=Main_page&variant=zh-cn should never be served.

	 */

	function addAcceptLanguage() {

		global $wgRequest, $wgContLang;

		if( !$wgRequest->getCheck( 'variant' ) && $wgContLang->hasVariants() ) {

			$variants = $wgContLang->getVariants();

			$aloption = array();

			foreach ( $variants as $variant ) {

				if( $variant === $wgContLang->getCode() ) {

					continue;

				} else {

					$aloption[] = 'string-contains=' . $variant;

					

					// IE and some other browsers use another form of language code

					// in their Accept-Language header, like "zh-CN" or "zh-TW".

					// We should handle these too.

					$ievariant = explode( '-', $variant );

					if ( count( $ievariant ) == 2 ) {

						$ievariant[1] = strtoupper( $ievariant[1] );

						$ievariant = implode( '-', $ievariant );

						$aloption[] = 'string-contains=' . $ievariant;

					}

				}

			}

			$this->addVaryHeader( 'Accept-Language', $aloption );

		}

	}



	/**

	 * Set a flag which will cause an X-Frame-Options header appropriate for 

	 * edit pages to be sent. The header value is controlled by 

	 * $wgEditPageFrameOptions.

	 *

	 * This is the default for special pages. If you display a CSRF-protected 

	 * form on an ordinary view page, then you need to call this function.

	 */

	public function preventClickjacking( $enable = true ) {

		$this->mPreventClickjacking = $enable;

	}



	/**

	 * Turn off frame-breaking. Alias for $this->preventClickjacking(false).

	 * This can be called from pages which do not contain any CSRF-protected

	 * HTML form.

	 */

	public function allowClickjacking() {

		$this->mPreventClickjacking = false;

	}



	/**

	 * Get the X-Frame-Options header value (without the name part), or false 

	 * if there isn't one. This is used by Skin to determine whether to enable 

	 * JavaScript frame-breaking, for clients that don't support X-Frame-Options.

	 */

	public function getFrameOptions() {

		global $wgBreakFrames, $wgEditPageFrameOptions;

		if ( $wgBreakFrames ) {

			return 'DENY';

		} elseif ( $this->mPreventClickjacking && $wgEditPageFrameOptions ) {

			return $wgEditPageFrameOptions;

		}

	}



	/**

	 * Send cache control HTTP headers

	 */

	public function sendCacheControl() {

		global $wgUseSquid, $wgUseESI, $wgUseETag, $wgSquidMaxage, $wgRequest, $wgUseXVO;



		$response = $wgRequest->response();

		if ( $wgUseETag && $this->mETag ) {

			$response->header( "ETag: $this->mETag" );

		}



		$this->addAcceptLanguage();



		# don't serve compressed data to clients who can't handle it

		# maintain different caches for logged-in users and non-logged in ones

		$response->header( 'Vary: ' . join( ', ', array_keys( $this->mVaryHeader ) ) );



		if ( $wgUseXVO ) {

			# Add an X-Vary-Options header for Squid with Wikimedia patches

			$response->header( $this->getXVO() );

		}



		if( !$this->uncacheableBecauseRequestVars() && $this->mEnableClientCache ) {

			if(

				$wgUseSquid && session_id() == '' && !$this->isPrintable() &&

				$this->mSquidMaxage != 0 && !$this->haveCacheVaryCookies()

			)

			{

				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( __METHOD__ . ": 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"');

					$response->header( 'Surrogate-Control: max-age='.$wgSquidMaxage.'+'.$this->mSquidMaxage.', content="ESI/1.0"');

					$response->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( __METHOD__ . ": 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" );

					$response->header( 'Cache-Control: s-maxage='.$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( __METHOD__ . ": private caching; {$this->mLastModified} **\n", false );

				$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );

				$response->header( "Cache-Control: private, must-revalidate, max-age=0" );

			}

			if($this->mLastModified) {

				$response->header( "Last-Modified: {$this->mLastModified}" );

			}

		} else {

			wfDebug( __METHOD__ . ": 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.

			$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );

			$response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );

			$response->header( 'Pragma: no-cache' );

		}

	}



	/**

	 * Get the message associed with the HTTP response code $code

	 *

	 * @param $code Integer: status code

	 * @return String or null: message or null if $code is not in the list of

	 *         messages

	 */

	public static function getStatusMessage( $code ) {

		static $statusMessage = array(

			100 => 'Continue',

			101 => 'Switching Protocols',

			102 => 'Processing',

			200 => 'OK',

			201 => 'Created',

			202 => 'Accepted',

			203 => 'Non-Authoritative Information',

			204 => 'No Content',

			205 => 'Reset Content',

			206 => 'Partial Content',

			207 => 'Multi-Status',

			300 => 'Multiple Choices',

			301 => 'Moved Permanently',

			302 => 'Found',

			303 => 'See Other',

			304 => 'Not Modified',

			305 => 'Use Proxy',

			307 => 'Temporary Redirect',

			400 => 'Bad Request',

			401 => 'Unauthorized',

			402 => 'Payment Required',

			403 => 'Forbidden',

			404 => 'Not Found',

			405 => 'Method Not Allowed',

			406 => 'Not Acceptable',

			407 => 'Proxy Authentication Required',

			408 => 'Request Timeout',

			409 => 'Conflict',

			410 => 'Gone',

			411 => 'Length Required',

			412 => 'Precondition Failed',

			413 => 'Request Entity Too Large',

			414 => 'Request-URI Too Large',

			415 => 'Unsupported Media Type',

			416 => 'Request Range Not Satisfiable',

			417 => 'Expectation Failed',

			422 => 'Unprocessable Entity',

			423 => 'Locked',

			424 => 'Failed Dependency',

			500 => 'Internal Server Error',

			501 => 'Not Implemented',

			502 => 'Bad Gateway',

			503 => 'Service Unavailable',

			504 => 'Gateway Timeout',

			505 => 'HTTP Version Not Supported',

			507 => 'Insufficient Storage'

		);

		return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;

	}



	/**

	 * Finally, all the text has been munged and accumulated into

	 * the object, let's actually output it:

	 */

	public function output() {

		global $wgUser, $wgOutputEncoding, $wgRequest;

		global $wgLanguageCode, $wgDebugRedirects, $wgMimeType;

		global $wgUseAjax, $wgAjaxWatch;

		global $wgEnableMWSuggest, $wgUniversalEditButton;

		global $wgArticle;



		if( $this->mDoNothing ) {

			return;

		}

		wfProfileIn( __METHOD__ );

		if ( $this->mRedirect != '' ) {

			# Standards require redirect URLs to be absolute

			$this->mRedirect = wfExpandUrl( $this->mRedirect );

			if( $this->mRedirectCode == '301' || $this->mRedirectCode == '303' ) {

				if( !$wgDebugRedirects ) {

					$message = self::getStatusMessage( $this->mRedirectCode );

					$wgRequest->response()->header( "HTTP/1.1 {$this->mRedirectCode} $message" );

				}

				$this->mLastModified = wfTimestamp( TS_RFC2822 );

			}

			$this->sendCacheControl();



			$wgRequest->response()->header( "Content-Type: text/html; charset=utf-8" );

			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 {

				$wgRequest->response()->header( 'Location: ' . $this->mRedirect );

			}

			wfProfileOut( __METHOD__ );

			return;

		} elseif ( $this->mStatusCode ) {

			$message = self::getStatusMessage( $this->mStatusCode );

			if ( $message ) {

				$wgRequest->response()->header( 'HTTP/1.1 ' . $this->mStatusCode . ' ' . $message );

			}

		}



		$sk = $wgUser->getSkin();



		// Add base resources

		$this->addModules( 'mediawiki.util' );

		global $wgIncludeLegacyJavaScript;

		if( $wgIncludeLegacyJavaScript ){

			$this->addModules( 'mediawiki.legacy.wikibits' );

		}



		// Add various resources if required

		if ( $wgUseAjax ) {

			$this->addModules( 'mediawiki.legacy.ajax' );



			wfRunHooks( 'AjaxAddScript', array( &$this ) );



			if( $wgAjaxWatch && $wgUser->isLoggedIn() ) {

				$this->addModules( 'mediawiki.legacy.ajaxwatch' );

			}



			if ( $wgEnableMWSuggest && !$wgUser->getOption( 'disablesuggest', false ) ) {

				$this->addModules( 'mediawiki.legacy.mwsuggest' );

			}

		}



		if( $wgUser->getBoolOption( 'editsectiononrightclick' ) ) {

			$this->addModules( 'mediawiki.action.view.rightClickEdit' );

		}



		if( $wgUniversalEditButton ) {

			if( isset( $wgArticle ) && $this->getTitle() && $this->getTitle()->quickUserCan( 'edit' )

				&& ( $this->getTitle()->exists() || $this->getTitle()->quickUserCan( 'create' ) ) ) {

				// Original UniversalEditButton

				$msg = wfMsg( 'edit' );

				$this->addLink( array(

					'rel' => 'alternate',

					'type' => 'application/x-wiki',

					'title' => $msg,

					'href' => $this->getTitle()->getLocalURL( 'action=edit' )

				) );

				// Alternate edit link

				$this->addLink( array(

					'rel' => 'edit',

					'title' => $msg,

					'href' => $this->getTitle()->getLocalURL( 'action=edit' )

				) );

			}

		}





		# Buffer output; final headers may depend on later processing

		ob_start();



		$wgRequest->response()->header( "Content-type: $wgMimeType; charset={$wgOutputEncoding}" );

		$wgRequest->response()->header( 'Content-language: ' . $wgLanguageCode );



		// Prevent framing, if requested

		$frameOptions = $this->getFrameOptions();

		if ( $frameOptions ) {

			$wgRequest->response()->header( "X-Frame-Options: $frameOptions" );

		}



		if ( $this->mArticleBodyOnly ) {

			$this->out( $this->mBodytext );

		} else {

			// Hook that allows last minute changes to the output page, e.g.

			// adding of CSS or Javascript by extensions.

			wfRunHooks( 'BeforePageDisplay', array( &$this, &$sk ) );



			wfProfileIn( 'Output-skin' );

			$sk->outputPage( $this );

			wfProfileOut( 'Output-skin' );

		}



		$this->sendCacheControl();

		ob_end_flush();

		wfProfileOut( __METHOD__ );

	}



	/**

	 * Actually output something with print(). Performs an iconv to the

	 * output encoding, if needed.

	 *

	 * @param $ins String: the string to output

	 */

	public 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;

	}



	/**

	 * @todo document

	 */

	public static function setEncodings() {

		global $wgInputEncoding, $wgOutputEncoding;



		$wgInputEncoding = strtolower( $wgInputEncoding );



		if ( empty( $_SERVER['HTTP_ACCEPT_CHARSET'] ) ) {

			$wgOutputEncoding = strtolower( $wgOutputEncoding );

			return;

		}

		$wgOutputEncoding = $wgInputEncoding;

	}



	/**

	 * @deprecated use wfReportTime() instead.

	 *

	 * @return String

	 */

	public function reportTime() {

		wfDeprecated( __METHOD__ );

		$time = wfReportTime();

		return $time;

	}



	/**

	 * Produce a "user is blocked" page.

	 *

	 * @param $return Boolean: whether to have a "return to $wgTitle" message or not.

	 * @return nothing

	 */

	function blockedPage( $return = true ) {

		global $wgUser, $wgContLang, $wgLang;



		$this->setPageTitle( wfMsg( 'blockedtitle' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );



		$name = User::whoIs( $wgUser->blockedBy() );

		$reason = $wgUser->blockedFor();

		if( $reason == '' ) {

			$reason = wfMsg( 'blockednoreason' );

		}

		$blockTimestamp = $wgLang->timeanddate(

			wfTimestamp( TS_MW, $wgUser->mBlock->mTimestamp ), true

		);

		$ip = wfGetIP();



		$link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";



		$blockid = $wgUser->mBlock->mId;



		$blockExpiry = $wgUser->mBlock->mExpiry;

		if ( $blockExpiry == 'infinity' ) {

			// Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'

			// Search for localization in 'ipboptions'

			$scBlockExpiryOptions = wfMsg( 'ipboptions' );

			foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {

				if ( strpos( $option, ':' ) === false ) {

					continue;

				}

				list( $show, $value ) = explode( ':', $option );

				if ( $value == 'infinite' || $value == 'indefinite' ) {

					$blockExpiry = $show;

					break;

				}

			}

		} else {

			$blockExpiry = $wgLang->timeanddate(

				wfTimestamp( TS_MW, $blockExpiry ),

				true

			);

		}



		if ( $wgUser->mBlock->mAuto ) {

			$msg = 'autoblockedtext';

		} else {

			$msg = 'blockedtext';

		}



		/* $ip returns who *is* being blocked, $intended contains who was meant to be blocked.

		 * This could be a username, an IP range, or a single IP. */

		$intended = $wgUser->mBlock->mAddress;



		$this->addWikiMsg(

			$msg, $link, $reason, $ip, $name, $blockid, $blockExpiry,

			$intended, $blockTimestamp

		);



		# Don't auto-return to special pages

		if( $return ) {

			$return = $this->getTitle()->getNamespace() > -1 ? $this->getTitle() : null;

			$this->returnToMain( null, $return );

		}

	}



	/**

	 * Output a standard error page

	 *

	 * @param $title String: message key for page title

	 * @param $msg String: message key for page text

	 * @param $params Array: message parameters

	 */

	public function showErrorPage( $title, $msg, $params = array() ) {

		if ( $this->getTitle() ) {

			$this->mDebugtext .= 'Original title: ' . $this->getTitle()->getPrefixedText() . "\n";

		}

		$this->setPageTitle( wfMsg( $title ) );

		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );

		$this->enableClientCache( false );

		$this->mRedirect = '';

		$this->mBodytext = '';



		array_unshift( $params, 'parse' );

		array_unshift( $params, $msg );

		$this->addHTML( call_user_func_array( 'wfMsgExt', $params ) );



		$this->returnToMain();

	}



	/**

	 * Output a standard permission error page

	 *

	 * @param $errors Array: error message keys

	 * @param $action String: action that was denied or null if unknown

	 */

	public function showPermissionsErrorPage( $errors, $action = null ) {

		$this->mDebugtext .= 'Original title: ' .

		$this->getTitle()->getPrefixedText() . "\n";

		$this->setPageTitle( wfMsg( 'permissionserrors' ) );

		$this->setHTMLTitle( wfMsg( 'permissionserrors' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );

		$this->enableClientCache( false );

		$this->mRedirect = '';

		$this->mBodytext = '';

		$this->addWikiText( $this->formatPermissionsErrorMessage( $errors, $action ) );

	}



	/**

	 * Display an error page indicating that a given version of MediaWiki is

	 * required to use it

	 *

	 * @param $version Mixed: the version of MediaWiki needed to use the page

	 */

	public function versionRequired( $version ) {

		$this->setPageTitle( wfMsg( 'versionrequired', $version ) );

		$this->setHTMLTitle( wfMsg( 'versionrequired', $version ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );

		$this->mBodytext = '';



		$this->addWikiMsg( 'versionrequiredtext', $version );

		$this->returnToMain();

	}



	/**

	 * Display an error page noting that a given permission bit is required.

	 *

	 * @param $permission String: key required

	 */

	public function permissionRequired( $permission ) {

		global $wgLang;



		$this->setPageTitle( wfMsg( 'badaccess' ) );

		$this->setHTMLTitle( wfMsg( 'errorpagetitle' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );

		$this->mBodytext = '';



		$groups = array_map( array( 'User', 'makeGroupLinkWiki' ),

			User::getGroupsWithPermission( $permission ) );

		if( $groups ) {

			$this->addWikiMsg(

				'badaccess-groups',

				$wgLang->commaList( $groups ),

				count( $groups )

			);

		} else {

			$this->addWikiMsg( 'badaccess-group0' );

		}

		$this->returnToMain();

	}



	/**

	 * Produce the stock "please login to use the wiki" page

	 */

	public function loginToUse() {

		global $wgUser;



		if( $wgUser->isLoggedIn() ) {

			$this->permissionRequired( 'read' );

			return;

		}



		$skin = $wgUser->getSkin();



		$this->setPageTitle( wfMsg( 'loginreqtitle' ) );

		$this->setHtmlTitle( wfMsg( 'errorpagetitle' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleFlag( false );



		$loginTitle = SpecialPage::getTitleFor( 'Userlogin' );

		$loginLink = $skin->link(

			$loginTitle,

			wfMsgHtml( 'loginreqlink' ),

			array(),

			array( 'returnto' => $this->getTitle()->getPrefixedText() ),

			array( 'known', 'noclasses' )

		);

		$this->addHTML( wfMsgWikiHtml( 'loginreqpagetext', $loginLink ) );

		$this->addHTML( "\n<!--" . $this->getTitle()->getPrefixedUrl() . '-->' );



		# Don't return to the main page if the user can't read it

		# otherwise we'll end up in a pointless loop

		$mainPage = Title::newMainPage();

		if( $mainPage->userCanRead() ) {

			$this->returnToMain( null, $mainPage );

		}

	}



	/**

	 * Format a list of error messages

	 *

	 * @param $errors An array of arrays returned by Title::getUserPermissionsErrors

	 * @param $action String: action that was denied or null if unknown

	 * @return String: the wikitext error-messages, formatted into a list.

	 */

	public function formatPermissionsErrorMessage( $errors, $action = null ) {

		if ( $action == null ) {

			$text = wfMsgNoTrans( 'permissionserrorstext', count( $errors ) ) . "\n\n";

		} else {

			$action_desc = wfMsgNoTrans( "action-$action" );

			$text = wfMsgNoTrans(

				'permissionserrorstext-withaction',

				count( $errors ),

				$action_desc

			) . "\n\n";

		}



		if ( count( $errors ) > 1 ) {

			$text .= '<ul class="permissions-errors">' . "\n";



			foreach( $errors as $error ) {

				$text .= '<li>';

				$text .= call_user_func_array( 'wfMsgNoTrans', $error );

				$text .= "</li>\n";

			}

			$text .= '</ul>';

		} else {

			$text .= "<div class=\"permissions-errors\">\n" .

					call_user_func_array( 'wfMsgNoTrans', reset( $errors ) ) .

					"\n</div>";

		}



		return $text;

	}



	/**

	 * Display a page stating that the Wiki is in read-only mode,

	 * and optionally show the source of the page that the user

	 * was trying to edit.  Should only be called (for this

	 * purpose) after wfReadOnly() has returned true.

	 *

	 * For historical reasons, this function is _also_ used to

	 * show the error message when a user tries to edit a page

	 * they are not allowed to edit.  (Unless it's because they're

	 * blocked, then we show blockedPage() instead.)  In this

	 * case, the second parameter should be set to true and a list

	 * of reasons supplied as the third parameter.

	 *

	 * @todo Needs to be split into multiple functions.

	 *

	 * @param $source    String: source code to show (or null).

	 * @param $protected Boolean: is this a permissions error?

	 * @param $reasons   Array: list of reasons for this error, as returned by Title::getUserPermissionsErrors().

	 * @param $action    String: action that was denied or null if unknown

	 */

	public function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {

		global $wgUser;

		$skin = $wgUser->getSkin();



		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );



		// If no reason is given, just supply a default "I can't let you do

		// that, Dave" message.  Should only occur if called by legacy code.

		if ( $protected && empty( $reasons ) ) {

			$reasons[] = array( 'badaccess-group0' );

		}



		if ( !empty( $reasons ) ) {

			// Permissions error

			if( $source ) {

				$this->setPageTitle( wfMsg( 'viewsource' ) );

				$this->setSubtitle(

					wfMsg( 'viewsourcefor', $skin->linkKnown( $this->getTitle() ) )

				);

			} else {

				$this->setPageTitle( wfMsg( 'badaccess' ) );

			}

			$this->addWikiText( $this->formatPermissionsErrorMessage( $reasons, $action ) );

		} else {

			// Wiki is read only

			$this->setPageTitle( wfMsg( 'readonly' ) );

			$reason = wfReadOnlyReason();

			$this->wrapWikiMsg( "<div class='mw-readonly-error'>\n$1\n</div>", array( 'readonlytext', $reason ) );

		}



		// Show source, if supplied

		if( is_string( $source ) ) {

			$this->addWikiMsg( 'viewsourcetext' );



			$params = array(

				'id'   => 'wpTextbox1',

				'name' => 'wpTextbox1',

				'cols' => $wgUser->getOption( 'cols' ),

				'rows' => $wgUser->getOption( 'rows' ),

				'readonly' => 'readonly'

			);

			$this->addHTML( Html::element( 'textarea', $params, $source ) );



			// Show templates used by this article

			$skin = $wgUser->getSkin();

			$article = new Article( $this->getTitle() );

			$this->addHTML( "<div class='templatesUsed'>

{$skin->formatTemplates( $article->getUsedTemplates() )}

</div>

" );

		}



		# If the title doesn't exist, it's fairly pointless to print a return

		# link to it.  After all, you just tried editing it and couldn't, so

		# what's there to do there?

		if( $this->getTitle()->exists() ) {

			$this->returnToMain( null, $this->getTitle() );

		}

	}



	/** @deprecated */

	public function errorpage( $title, $msg ) {

		wfDeprecated( __METHOD__ );

		throw new ErrorPageError( $title, $msg );

	}



	/** @deprecated */

	public function databaseError( $fname, $sql, $error, $errno ) {

		throw new MWException( "OutputPage::databaseError is obsolete\n" );

	}



	/** @deprecated */

	public function fatalError( $message ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( $message );

	}



	/** @deprecated */

	public function unexpectedValueError( $name, $val ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( wfMsg( 'unexpected', $name, $val ) );

	}



	/** @deprecated */

	public function fileCopyError( $old, $new ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( wfMsg( 'filecopyerror', $old, $new ) );

	}



	/** @deprecated */

	public function fileRenameError( $old, $new ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( wfMsg( 'filerenameerror', $old, $new ) );

	}



	/** @deprecated */

	public function fileDeleteError( $name ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( wfMsg( 'filedeleteerror', $name ) );

	}



	/** @deprecated */

	public function fileNotFoundError( $name ) {

		wfDeprecated( __METHOD__ );

		throw new FatalError( wfMsg( 'filenotfound', $name ) );

	}



	public function showFatalError( $message ) {

		$this->setPageTitle( wfMsg( 'internalerror' ) );

		$this->setRobotPolicy( 'noindex,nofollow' );

		$this->setArticleRelated( false );

		$this->enableClientCache( false );

		$this->mRedirect = '';

		$this->mBodytext = $message;

	}



	public function showUnexpectedValueError( $name, $val ) {

		$this->showFatalError( wfMsg( 'unexpected', $name, $val ) );

	}



	public function showFileCopyError( $old, $new ) {

		$this->showFatalError( wfMsg( 'filecopyerror', $old, $new ) );

	}



	public function showFileRenameError( $old, $new ) {

		$this->showFatalError( wfMsg( 'filerenameerror', $old, $new ) );

	}



	public function showFileDeleteError( $name ) {

		$this->showFatalError( wfMsg( 'filedeleteerror', $name ) );

	}



	public function showFileNotFoundError( $name ) {

		$this->showFatalError( wfMsg( 'filenotfound', $name ) );

	}



	/**

	 * Add a "return to" link pointing to a specified title

	 *

	 * @param $title Title to link

	 * @param $query String: query string

	 * @param $text String text of the link (input is not escaped)

	 */

	public function addReturnTo( $title, $query = array(), $text = null ) {

		global $wgUser;

		$this->addLink( array( 'rel' => 'next', 'href' => $title->getFullURL() ) );

		$link = wfMsgHtml(

			'returnto',

			$wgUser->getSkin()->link( $title, $text, array(), $query )

		);

		$this->addHTML( "<p id=\"mw-returnto\">{$link}</p>\n" );

	}



	/**

	 * Add a "return to" link pointing to a specified title,

	 * or the title indicated in the request, or else the main page

	 *

	 * @param $unused No longer used

	 * @param $returnto Title or String to return to

	 * @param $returntoquery String: query string for the return to link

	 */

	public function returnToMain( $unused = null, $returnto = null, $returntoquery = null ) {

		global $wgRequest;



		if ( $returnto == null ) {

			$returnto = $wgRequest->getText( 'returnto' );

		}



		if ( $returntoquery == null ) {

			$returntoquery = $wgRequest->getText( 'returntoquery' );

		}



		if ( $returnto === '' ) {

			$returnto = Title::newMainPage();

		}



		if ( is_object( $returnto ) ) {

			$titleObj = $returnto;

		} else {

			$titleObj = Title::newFromText( $returnto );

		}

		if ( !is_object( $titleObj ) ) {

			$titleObj = Title::newMainPage();

		}



		$this->addReturnTo( $titleObj, $returntoquery );

	}



	/**

	 * @param $sk Skin The given Skin

	 * @param $includeStyle Boolean: unused

	 * @return String: The doctype, opening <html>, and head element.

	 */

	public function headElement( Skin $sk, $includeStyle = true ) {

		global $wgOutputEncoding, $wgMimeType;

		global $wgUseTrackbacks, $wgHtml5;

		global $wgUser, $wgRequest, $wgLang;



		if ( $sk->commonPrintStylesheet() ) {

			$this->addModuleStyles( 'mediawiki.legacy.wikiprintable' );

		}

		$sk->setupUserCss( $this );



		$lang = wfUILang();

		$ret = Html::htmlHeader( array( 'lang' => $lang->getCode(), 'dir' => $lang->getDir() ) );



		if ( $this->getHTMLTitle() == '' ) {

			$this->setHTMLTitle( wfMsg( 'pagetitle', $this->getPageTitle() ) );

		}



		$openHead = Html::openElement( 'head' );

		if ( $openHead ) {

			# Don't bother with the newline if $head == ''

			$ret .= "$openHead\n";

		}



		if ( $wgHtml5 ) {

			# More succinct than <meta http-equiv=Content-Type>, has the

			# same effect

			$ret .= Html::element( 'meta', array( 'charset' => $wgOutputEncoding ) ) . "\n";

		} else {

			$this->addMeta( 'http:Content-Type', "$wgMimeType; charset=$wgOutputEncoding" );

		}



		$ret .= Html::element( 'title', null, $this->getHTMLTitle() ) . "\n";



		$ret .= implode( "\n", array(

			$this->getHeadLinks( $sk ),

			$this->buildCssLinks( $sk ),

			$this->getHeadItems()

		) );



		if ( $wgUseTrackbacks && $this->isArticleRelated() ) {

			$ret .= $this->getTitle()->trackbackRDF();

		}



		$closeHead = Html::closeElement( 'head' );

		if ( $closeHead ) {

			$ret .= "$closeHead\n";

		}



		$bodyAttrs = array();



		# Crazy edit-on-double-click stuff

		$action = $wgRequest->getVal( 'action', 'view' );



		if (

			$this->getTitle()->getNamespace() != NS_SPECIAL &&

			!in_array( $action, array( 'edit', 'submit' ) ) &&

			$wgUser->getOption( 'editondblclick' )

		)

		{

			$editUrl = $this->getTitle()->getLocalUrl( $sk->editUrlOptions() );

			$bodyAttrs['ondblclick'] = "document.location = '" .

				Xml::escapeJsString( $editUrl ) . "'";

		}



		# Class bloat

		$dir = wfUILang()->getDir();

		$bodyAttrs['class'] = "mediawiki $dir";



		if ( $wgLang->capitalizeAllNouns() ) {

			# A <body> class is probably not the best way to do this . . .

			$bodyAttrs['class'] .= ' capitalize-all-nouns';

		}

		$bodyAttrs['class'] .= ' ns-' . $this->getTitle()->getNamespace();

		if ( $this->getTitle()->getNamespace() == NS_SPECIAL ) {

			$bodyAttrs['class'] .= ' ns-special';

		} elseif ( $this->getTitle()->isTalkPage() ) {

			$bodyAttrs['class'] .= ' ns-talk';

		} else {

			$bodyAttrs['class'] .= ' ns-subject';

		}

		$bodyAttrs['class'] .= ' ' . Sanitizer::escapeClass( 'page-' . $this->getTitle()->getPrefixedText() );

		$bodyAttrs['class'] .= ' skin-' . Sanitizer::escapeClass( $wgUser->getSkin()->getSkinName() );



		$sk->addToBodyAttributes( $this, $bodyAttrs ); // Allow skins to add body attributes they need

		wfRunHooks( 'OutputPageBodyAttributes', array( $this, $sk, &$bodyAttrs ) );



		$ret .= Html::openElement( 'body', $bodyAttrs ) . "\n";



		return $ret;

	}



	/**

	 * Get a ResourceLoader object associated with this OutputPage

	 */

	public function getResourceLoader() {

		if ( is_null( $this->mResourceLoader ) ) {

			$this->mResourceLoader = new ResourceLoader();

		}

		return $this->mResourceLoader;

	}		



	/**

	 * TODO: Document

	 * @param $skin Skin

	 * @param $modules Array/string with the module name

	 * @param $only string May be styles, messages or scripts

	 * @param $useESI boolean

	 * @return string html <script> and <style> tags

	 */

	protected function makeResourceLoaderLink( Skin $skin, $modules, $only, $useESI = false ) {

		global $wgUser, $wgLang, $wgLoadScript, $wgResourceLoaderUseESI,

			$wgResourceLoaderInlinePrivateModules, $wgRequest;

		// Lazy-load ResourceLoader

		// TODO: Should this be a static function of ResourceLoader instead?

		$baseQuery = array(

			'lang' => $wgLang->getCode(),

			'debug' => ResourceLoader::inDebugMode() ? 'true' : 'false',

			'skin' => $skin->getSkinName(),

			'only' => $only,

		);

		// Propagate printable and handheld parameters if present

		if ( $wgRequest->getBool( 'printable' ) ) {

			$baseQuery['printable'] = 1;

		}

		if ( $wgRequest->getBool( 'handheld' ) ) {

			$baseQuery['handheld'] = 1;

		}

		

		if ( !count( $modules ) ) {

			return '';

		}

		

		if ( count( $modules ) > 1 ) {

			// Remove duplicate module requests

			$modules = array_unique( (array) $modules );

			// Sort module names so requests are more uniform

			sort( $modules );

		

			if ( ResourceLoader::inDebugMode() ) {

				// Recursively call us for every item

				$links = '';

				foreach ( $modules as $name ) {

					$links .= $this->makeResourceLoaderLink( $skin, $name, $only, $useESI );

				}

				return $links;

			}

		}

		

		// Create keyed-by-group list of module objects from modules list

		$groups = array();

		$resourceLoader = $this->getResourceLoader();

		foreach ( (array) $modules as $name ) {

			$module = $resourceLoader->getModule( $name );



			$group = $module->getGroup();

			if ( !isset( $groups[$group] ) ) {

				$groups[$group] = array();

			}

			$groups[$group][$name] = $module;

		}

		$links = '';

		foreach ( $groups as $group => $modules ) {

			$query = $baseQuery;

			// Special handling for user-specific groups

			if ( ( $group === 'user' || $group === 'private' ) && $wgUser->isLoggedIn() ) {

				$query['user'] = $wgUser->getName();

			}

			

			// Create a fake request based on the one we are about to make so modules return

			// correct timestamp and emptiness data

			$context = new ResourceLoaderContext( $resourceLoader, new FauxRequest( $query ) );

			// Drop modules that know they're empty

			foreach ( $modules as $key => $module ) {

				if ( $module->isKnownEmpty( $context ) ) {

					unset( $modules[$key] );

				}

			}

			// If there are no modules left, skip this group

			if ( $modules === array() ) {

				continue;

			}

			

			$query['modules'] = ResourceLoader::makePackedModulesString( array_keys( $modules ) );

			

			// Support inlining of private modules if configured as such

			if ( $group === 'private' && $wgResourceLoaderInlinePrivateModules ) {

				if ( $only == 'styles' ) {

					$links .= Html::inlineStyle(

						$resourceLoader->makeModuleResponse( $context, $modules )

					);

				} else {

					$links .= Html::inlineScript(

						ResourceLoader::makeLoaderConditionalScript(

							$resourceLoader->makeModuleResponse( $context, $modules )

						)

					);

				}

				continue;

			}

			// Special handling for the user group; because users might change their stuff

			// on-wiki like user pages, or user preferences; we need to find the highest

			// timestamp of these user-changable modules so we can ensure cache misses on change

			// This should NOT be done for the site group (bug 27564) because anons get that too

			// and we shouldn't be putting timestamps in Squid-cached HTML

			if ( $group === 'user' ) {

				// Get the maximum timestamp

				$timestamp = 1;

				foreach ( $modules as $module ) {

					$timestamp = max( $timestamp, $module->getModifiedTime( $context ) );

				}

				// Add a version parameter so cache will break when things change

				$query['version'] = wfTimestamp( TS_ISO_8601_BASIC, $timestamp );

			}

			// Make queries uniform in order

			ksort( $query );



			$url = wfAppendQuery( $wgLoadScript, $query );

			// Prevent the IE6 extension check from being triggered (bug 28840)

			// by appending a character that's invalid in Windows extensions ('*')

			$url .= '&*';

			if ( $useESI && $wgResourceLoaderUseESI ) {

				$esi = Xml::element( 'esi:include', array( 'src' => $url ) );

				if ( $only == 'styles' ) {

					$links .= Html::inlineStyle( $esi );

				} else {

					$links .= Html::inlineScript( $esi );

				}

			} else {

				// Automatically select style/script elements

				if ( $only === 'styles' ) {

					$links .= Html::linkedStyle( $url ) . "\n";

				} else {

					$links .= Html::linkedScript( $url ) . "\n";

				}

			}

		}

		return $links;

	}



	/**

	 * Gets the global variables and mScripts; also adds userjs to the end if

	 * enabled. Despite the name, these scripts are no longer put in the

	 * <head> but at the bottom of the <body>

	 *

	 * @param $sk Skin object to use

	 * @return String: HTML fragment

	 */

	function getHeadScripts( Skin $sk ) {

		global $wgUser, $wgRequest, $wgUseSiteJs;



		// Startup - this will immediately load jquery and mediawiki modules

		$scripts = $this->makeResourceLoaderLink( $sk, 'startup', 'scripts', true );



		// Configuration -- This could be merged together with the load and go, but

		// makeGlobalVariablesScript returns a whole script tag -- grumble grumble...

		$scripts .= Skin::makeGlobalVariablesScript( $sk->getSkinName() ) . "\n";



		// Script and Messages "only" requests

		$scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleScripts(), 'scripts' );

		$scripts .= $this->makeResourceLoaderLink( $sk, $this->getModuleMessages(), 'messages' );



		// Modules requests - let the client calculate dependencies and batch requests as it likes

		if ( $this->getModules() ) {

			$scripts .= Html::inlineScript(

				ResourceLoader::makeLoaderConditionalScript(

					Xml::encodeJsCall( 'mediaWiki.loader.load', array( $this->getModules() ) ) .

					Xml::encodeJsCall( 'mediaWiki.loader.go', array() )

				)

			) . "\n";

		}



		// Legacy Scripts

		$scripts .= "\n" . $this->mScripts;



		// Add site JS if enabled

		if ( $wgUseSiteJs ) {

			$scripts .= $this->makeResourceLoaderLink( $sk, 'site', 'scripts' );

		}



		// Add user JS if enabled - trying to load user.options as a bundle if possible

		$userOptionsAdded = false;

		if ( $this->isUserJsAllowed() && $wgUser->isLoggedIn() ) {

			$action = $wgRequest->getVal( 'action', 'view' );

			if( $this->mTitle && $this->mTitle->isJsSubpage() && $sk->userCanPreview( $action ) ) {

				# XXX: additional security check/prompt?

				$scripts .= Html::inlineScript( "\n" . $wgRequest->getText( 'wpTextbox1' ) . "\n" ) . "\n";

			} else {

				$scripts .= $this->makeResourceLoaderLink(

					$sk, array( 'user', 'user.options' ), 'scripts'

				);

				$userOptionsAdded = true;

			}

		}

		if ( !$userOptionsAdded ) {

			$scripts .= $this->makeResourceLoaderLink( $sk, 'user.options', 'scripts' );

		}

		

		return $scripts;

	}



	/**

	 * Add default \<meta\> tags

	 */

	protected function addDefaultMeta() {

		global $wgVersion, $wgHtml5;



		static $called = false;

		if ( $called ) {

			# Don't run this twice

			return;

		}

		$called = true;



		if ( !$wgHtml5 ) {

			$this->addMeta( 'http:Content-Style-Type', 'text/css' ); // bug 15835

		}

		$this->addMeta( 'generator', "MediaWiki $wgVersion" );



		$p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";

		if( $p !== 'index,follow' ) {

			// http://www.robotstxt.org/wc/meta-user.html

			// Only show if it's different from the default robots policy

			$this->addMeta( 'robots', $p );

		}



		if ( count( $this->mKeywords ) > 0 ) {

			$strip = array(

				"/<.*?" . ">/" => '',

				"/_/" => ' '

			);

			$this->addMeta(

				'keywords',

				preg_replace(

					array_keys( $strip ),

					array_values( $strip ),

					implode( ',', $this->mKeywords )

				)

			);

		}

	}



	/**

	 * @return string HTML tag links to be put in the header.

	 */

	public function getHeadLinks( Skin $sk ) {

		global $wgFeed;



		// Ideally this should happen earlier, somewhere. :P

		$this->addDefaultMeta();



		$tags = array();



		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';

			}

			$tags[] = Html::element( 'meta',

				array(

					$a => $tag[0],

					'content' => $tag[1]

				)

			);

		}

		foreach ( $this->mLinktags as $tag ) {

			$tags[] = Html::element( 'link', $tag );

		}



		if( $wgFeed ) {

			foreach( $this->getSyndicationLinks() as $format => $link ) {

				# Use the page name for the title (accessed through $wgTitle since

				# there's no other way).  In principle, this could lead to issues

				# with having the same name for different feeds corresponding to

				# the same page, but we can't avoid that at this low a level.



				$tags[] = $this->feedLink(

					$format,

					$link,

					# Used messages: 'page-rss-feed' and 'page-atom-feed' (for an easier grep)

					wfMsg( "page-{$format}-feed", $this->getTitle()->getPrefixedText() )

				);

			}



			# Recent changes feed should appear on every page (except recentchanges,

			# that would be redundant). Put it after the per-page feed to avoid

			# changing existing behavior. It's still available, probably via a

			# menu in your browser. Some sites might have a different feed they'd

			# like to promote instead of the RC feed (maybe like a "Recent New Articles"

			# or "Breaking news" one). For this, we see if $wgOverrideSiteFeed is defined.

			# If so, use it instead.



			global $wgOverrideSiteFeed, $wgSitename, $wgAdvertisedFeedTypes;

			$rctitle = SpecialPage::getTitleFor( 'Recentchanges' );



			if ( $wgOverrideSiteFeed ) {

				foreach ( $wgOverrideSiteFeed as $type => $feedUrl ) {

					$tags[] = $this->feedLink(

						$type,

						htmlspecialchars( $feedUrl ),

						wfMsg( "site-{$type}-feed", $wgSitename )

					);

				}

			} elseif ( $this->getTitle()->getPrefixedText() != $rctitle->getPrefixedText() ) {

				foreach ( $wgAdvertisedFeedTypes as $format ) {

					$tags[] = $this->feedLink(

						$format,

						$rctitle->getLocalURL( "feed={$format}" ),

						wfMsg( "site-{$format}-feed", $wgSitename ) # For grep: 'site-rss-feed', 'site-atom-feed'.

					);

				}

			}

		}



		return implode( "\n", $tags );

	}



	/**

	 * Generate a <link rel/> for a feed.

	 *

	 * @param $type String: feed type

	 * @param $url String: URL to the feed

	 * @param $text String: value of the "title" attribute

	 * @return String: HTML fragment

	 */

	private function feedLink( $type, $url, $text ) {

		return Html::element( 'link', array(

			'rel' => 'alternate',

			'type' => "application/$type+xml",

			'title' => $text,

			'href' => $url )

		);

	}



	/**

	 * Add a local or specified stylesheet, with the given media options.

	 * Meant primarily for internal use...

	 *

	 * @param $style String: URL to the file

	 * @param $media String: to specify a media type, 'screen', 'printable', 'handheld' or any.

	 * @param $condition String: for IE conditional comments, specifying an IE version

	 * @param $dir String: set to 'rtl' or 'ltr' for direction-specific sheets

	 */

	public function addStyle( $style, $media = '', $condition = '', $dir = '' ) {

		$options = array();

		// Even though we expect the media type to be lowercase, but here we

		// force it to lowercase to be safe.

		if( $media ) {

			$options['media'] = $media;

		}

		if( $condition ) {

			$options['condition'] = $condition;

		}

		if( $dir ) {

			$options['dir'] = $dir;

		}

		$this->styles[$style] = $options;

	}



	/**

	 * Adds inline CSS styles

	 * @param $style_css Mixed: inline CSS

	 */

	public function addInlineStyle( $style_css ){

		$this->mInlineStyles .= Html::inlineStyle( $style_css );

	}



	/**

	 * Build a set of <link>s for the stylesheets specified in the $this->styles array.

	 * These will be applied to various media & IE conditionals.

	 * @param $sk Skin object

	 */

	public function buildCssLinks( $sk ) {

		$ret = '';

		// Add ResourceLoader styles

		// Split the styles into four groups

		$styles = array( 'other' => array(), 'user' => array(), 'site' => array(), 'private' => array() );

		$resourceLoader = $this->getResourceLoader();

		foreach ( $this->getModuleStyles() as $name ) {

			$group = $resourceLoader->getModule( $name )->getGroup();

			// Modules in groups named "other" or anything different than "user", "site" or "private"

			// will be placed in the "other" group

			$styles[isset( $styles[$group] ) ? $group : 'other'][] = $name;

		}



		// We want site, private and user styles to override dynamically added styles from modules, but we want

		// dynamically added styles to override statically added styles from other modules. So the order

		// has to be other, dynamic, site, private, user

		// Add statically added styles for other modules

		$ret .= $this->makeResourceLoaderLink( $sk, $styles['other'], 'styles' );

		// Add normal styles added through addStyle()/addInlineStyle() here

		$ret .= implode( "\n", $this->buildCssLinksArray() ) . $this->mInlineStyles;

		// Add marker tag to mark the place where the client-side loader should inject dynamic styles

		// We use a <meta> tag with a made-up name for this because that's valid HTML

		$ret .= Html::element( 'meta', array( 'name' => 'ResourceLoaderDynamicStyles', 'content' => '' ) );

		

		// Add site, private and user styles

		// 'private' at present only contains user.options, so put that before 'user'

		// Any future private modules will likely have a similar user-specific character

		foreach ( array( 'site', 'private', 'user' ) as $group ) {

			$ret .= $this->makeResourceLoaderLink(

				$sk, array_merge( $styles['site'], $styles['user'] ), 'styles'

			);

		}

		return $ret;

	}



	public function buildCssLinksArray() {

		$links = array();

		foreach( $this->styles as $file => $options ) {

			$link = $this->styleLink( $file, $options );

			if( $link ) {

				$links[$file] = $link;

			}

		}

		return $links;

	}



	/**

	 * Generate \<link\> tags for stylesheets

	 *

	 * @param $style String: URL to the file

	 * @param $options Array: option, can contain 'condition', 'dir', 'media'

	 *                 keys

	 * @return String: HTML fragment

	 */

	protected function styleLink( $style, $options ) {

		if( isset( $options['dir'] ) ) {

			$siteDir = wfUILang()->getDir();

			if( $siteDir != $options['dir'] ) {

				return '';

			}

		}



		if( isset( $options['media'] ) ) {

			$media = self::transformCssMedia( $options['media'] );

			if( is_null( $media ) ) {

				return '';

			}

		} else {

			$media = 'all';

		}



		if( substr( $style, 0, 1 ) == '/' ||

			substr( $style, 0, 5 ) == 'http:' ||

			substr( $style, 0, 6 ) == 'https:' ) {

			$url = $style;

		} else {

			global $wgStylePath, $wgStyleVersion;

			$url = $wgStylePath . '/' . $style . '?' . $wgStyleVersion;

		}



		$link = Html::linkedStyle( $url, $media );



		if( isset( $options['condition'] ) ) {

			$condition = htmlspecialchars( $options['condition'] );

			$link = "<!--[if $condition]>$link<![endif]-->";

		}

		return $link;

	}



	/**

	 * Transform "media" attribute based on request parameters

	 *

	 * @param $media String: current value of the "media" attribute

	 * @return String: modified value of the "media" attribute

	 */

	public static function transformCssMedia( $media ) {

		global $wgRequest, $wgHandheldForIPhone;



		// Switch in on-screen display for media testing

		$switches = array(

			'printable' => 'print',

			'handheld' => 'handheld',

		);

		foreach( $switches as $switch => $targetMedia ) {

			if( $wgRequest->getBool( $switch ) ) {

				if( $media == $targetMedia ) {

					$media = '';

				} elseif( $media == 'screen' ) {

					return null;

				}

			}

		}



		// Expand longer media queries as iPhone doesn't grok 'handheld'

		if( $wgHandheldForIPhone ) {

			$mediaAliases = array(

				'screen' => 'screen and (min-device-width: 481px)',

				'handheld' => 'handheld, only screen and (max-device-width: 480px)',

			);



			if( isset( $mediaAliases[$media] ) ) {

				$media = $mediaAliases[$media];

			}

		}



		return $media;

	}



	/**

	 * Turn off regular page output and return an error reponse

	 * for when rate limiting has triggered.

	 */

	public function rateLimited() {

		$this->setPageTitle( wfMsg( 'actionthrottled' ) );

		$this->setRobotPolicy( 'noindex,follow' );

		$this->setArticleRelated( false );

		$this->enableClientCache( false );

		$this->mRedirect = '';

		$this->clearHTML();

		$this->setStatusCode( 503 );

		$this->addWikiMsg( 'actionthrottledtext' );



		$this->returnToMain( null, $this->getTitle() );

	}



	/**

	 * Show a warning about slave lag

	 *

	 * If the lag is higher than $wgSlaveLagCritical seconds,

	 * then the warning is a bit more obvious. If the lag is

	 * lower than $wgSlaveLagWarning, then no warning is shown.

	 *

	 * @param $lag Integer: slave lag

	 */

	public function showLagWarning( $lag ) {

		global $wgSlaveLagWarning, $wgSlaveLagCritical, $wgLang;

		if( $lag >= $wgSlaveLagWarning ) {

			$message = $lag < $wgSlaveLagCritical

				? 'lag-warn-normal'

				: 'lag-warn-high';

			$wrap = Html::rawElement( 'div', array( 'class' => "mw-{$message}" ), "\n$1\n" );

			$this->wrapWikiMsg( "$wrap\n", array( $message, $wgLang->formatNum( $lag ) ) );

		}

	}



	/**

	 * Add a wikitext-formatted message to the output.

	 * This is equivalent to:

	 *

	 *    $wgOut->addWikiText( wfMsgNoTrans( ... ) )

	 */

	public function addWikiMsg( /*...*/ ) {

		$args = func_get_args();

		$name = array_shift( $args );

		$this->addWikiMsgArray( $name, $args );

	}



	/**

	 * Add a wikitext-formatted message to the output.

	 * Like addWikiMsg() except the parameters are taken as an array

	 * instead of a variable argument list.

	 *

	 * $options is passed through to wfMsgExt(), see that function for details.

	 */

	public function addWikiMsgArray( $name, $args, $options = array() ) {

		$options[] = 'parse';

		$text = wfMsgExt( $name, $options, $args );

		$this->addHTML( $text );

	}



	/**

	 * This function takes a number of message/argument specifications, wraps them in

	 * some overall structure, and then parses the result and adds it to the output.

	 *

	 * In the $wrap, $1 is replaced with the first message, $2 with the second, and so

	 * on. The subsequent arguments may either be strings, in which case they are the

	 * message names, or arrays, in which case the first element is the message name,

	 * and subsequent elements are the parameters to that message.

	 *

	 * The special named parameter 'options' in a message specification array is passed

	 * through to the $options parameter of wfMsgExt().

	 *

	 * Don't use this for messages that are not in users interface language.

	 *

	 * For example:

	 *

	 *    $wgOut->wrapWikiMsg( "<div class='error'>\n$1\n</div>", 'some-error' );

	 *

	 * Is equivalent to:

	 *

	 *    $wgOut->addWikiText( "<div class='error'>\n" . wfMsgNoTrans( 'some-error' ) . "\n</div>" );

	 *

	 * The newline after opening div is needed in some wikitext. See bug 19226.

	 */

	public function wrapWikiMsg( $wrap /*, ...*/ ) {

		$msgSpecs = func_get_args();

		array_shift( $msgSpecs );

		$msgSpecs = array_values( $msgSpecs );

		$s = $wrap;

		foreach ( $msgSpecs as $n => $spec ) {

			$options = array();

			if ( is_array( $spec ) ) {

				$args = $spec;

				$name = array_shift( $args );

				if ( isset( $args['options'] ) ) {

					$options = $args['options'];

					unset( $args['options'] );

				}

			}  else {

				$args = array();

				$name = $spec;

			}

			$s = str_replace( '$' . ( $n + 1 ), wfMsgExt( $name, $options, $args ), $s );

		}

		$this->addHTML( $this->parse( $s, /*linestart*/true, /*uilang*/true ) );

	}



	/**

	 * Include jQuery core. Use this to avoid loading it multiple times

	 * before we get a usable script loader.

	 *

	 * @param $modules Array: list of jQuery modules which should be loaded

	 * @return Array: the list of modules which were not loaded.

	 * @since 1.16

	 * @deprecated No longer needed as of 1.17

	 */

	public function includeJQuery( $modules = array() ) {

		return array();

	}



}