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[mediawiki.git] / includes / Skin.php

<?php
/**
 * Base class for all skins.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * @defgroup Skins Skins
 */

if ( !defined( 'MEDIAWIKI' ) ) {
        die( 1 );
}

/**
 * The main skin class that provide methods and properties for all other skins.
 * This base class is also the "Standard" skin.
 *
 * See docs/skin.txt for more information.
 *
 * @ingroup Skins
 */
abstract class Skin extends ContextSource {
        protected $skinname = 'standard';
        protected $mRelevantTitle = null;
        protected $mRelevantUser = null;

        /**
         * Fetch the set of available skins.
         * @return array associative array of strings
         */
        static function getSkinNames() {
                global $wgValidSkinNames;
                static $skinsInitialised = false;

                if ( !$skinsInitialised || !count( $wgValidSkinNames ) ) {
                        # Get a list of available skins
                        # Build using the regular expression '^(.*).php$'
                        # Array keys are all lower case, array value keep the case used by filename
                        #
                        wfProfileIn( __METHOD__ . '-init' );

                        global $wgStyleDirectory;

                        $skinDir = dir( $wgStyleDirectory );

                        # while code from www.php.net
                        while ( false !== ( $file = $skinDir->read() ) ) {
                                // Skip non-PHP files, hidden files, and '.dep' includes
                                $matches = array();

                                if ( preg_match( '/^([^.]*)\.php$/', $file, $matches ) ) {
                                        $aSkin = $matches[1];
                                        $wgValidSkinNames[strtolower( $aSkin )] = $aSkin;
                                }
                        }
                        $skinDir->close();
                        $skinsInitialised = true;
                        wfProfileOut( __METHOD__ . '-init' );
                }
                return $wgValidSkinNames;
        }
 
        /**
         * Fetch the skinname messages for available skins.
         * @return array of strings
         */
        static function getSkinNameMessages() {
                $messages = array();
                foreach( self::getSkinNames() as $skinKey => $skinName ) {
                        $messages[] = "skinname-$skinKey";
                }
                return $messages;
        }

        /**
         * Fetch the list of usable skins in regards to $wgSkipSkins.
         * Useful for Special:Preferences and other places where you
         * only want to show skins users _can_ use.
         * @return array of strings
         */
        public static function getUsableSkins() {
                global $wgSkipSkins;

                $usableSkins = self::getSkinNames();

                foreach ( $wgSkipSkins as $skip ) {
                        unset( $usableSkins[$skip] );
                }

                return $usableSkins;
        }

        /**
         * Normalize a skin preference value to a form that can be loaded.
         * If a skin can't be found, it will fall back to the configured
         * default (or the old 'Classic' skin if that's broken).
         * @param $key String: 'monobook', 'standard', etc.
         * @return string
         */
        static function normalizeKey( $key ) {
                global $wgDefaultSkin;

                $skinNames = Skin::getSkinNames();

                if ( $key == '' || $key == 'default' ) {
                        // Don't return the default immediately;
                        // in a misconfiguration we need to fall back.
                        $key = $wgDefaultSkin;
                }

                if ( isset( $skinNames[$key] ) ) {
                        return $key;
                }

                // Older versions of the software used a numeric setting
                // in the user preferences.
                $fallback = array(
                        0 => $wgDefaultSkin,
                        1 => 'nostalgia',
                        2 => 'cologneblue'
                );

                if ( isset( $fallback[$key] ) ) {
                        $key = $fallback[$key];
                }

                if ( isset( $skinNames[$key] ) ) {
                        return $key;
                } elseif ( isset( $skinNames[$wgDefaultSkin] ) ) {
                        return $wgDefaultSkin;
                } else {
                        return 'vector';
                }
        }

        /**
         * Factory method for loading a skin of a given type
         * @param $key String: 'monobook', 'standard', etc.
         * @return Skin
         */
        static function &newFromKey( $key ) {
                global $wgStyleDirectory;

                $key = Skin::normalizeKey( $key );

                $skinNames = Skin::getSkinNames();
                $skinName = $skinNames[$key];
                $className = "Skin{$skinName}";

                # Grab the skin class and initialise it.
                if ( !MWInit::classExists( $className ) ) {

                        if ( !defined( 'MW_COMPILED' ) ) {
                                // Preload base classes to work around APC/PHP5 bug
                                $deps = "{$wgStyleDirectory}/{$skinName}.deps.php";
                                if ( file_exists( $deps ) ) {
                                        include_once( $deps );
                                }
                                require_once( "{$wgStyleDirectory}/{$skinName}.php" );
                        }

                        # Check if we got if not failback to default skin
                        if ( !MWInit::classExists( $className ) ) {
                                # DO NOT die if the class isn't found. This breaks maintenance
                                # scripts and can cause a user account to be unrecoverable
                                # except by SQL manipulation if a previously valid skin name
                                # is no longer valid.
                                wfDebug( "Skin class does not exist: $className\n" );
                                $className = 'SkinVector';
                                if ( !defined( 'MW_COMPILED' ) ) {
                                        require_once( "{$wgStyleDirectory}/Vector.php" );
                                }
                        }
                }
                $skin = new $className( $key );
                return $skin;
        }

        /** @return string skin name */
        public function getSkinName() {
                return $this->skinname;
        }

        /**
         * @param $out OutputPage
         */
        function initPage( OutputPage $out ) {
                wfProfileIn( __METHOD__ );

                $this->preloadExistence();

                wfProfileOut( __METHOD__ );
        }

        /**
         * Preload the existence of three commonly-requested pages in a single query
         */
        function preloadExistence() {
                $user = $this->getUser();

                // User/talk link
                $titles = array( $user->getUserPage(), $user->getTalkPage() );

                // Other tab link
                if ( $this->getTitle()->isSpecialPage() ) {
                        // nothing
                } elseif ( $this->getTitle()->isTalkPage() ) {
                        $titles[] = $this->getTitle()->getSubjectPage();
                } else {
                        $titles[] = $this->getTitle()->getTalkPage();
                }

                $lb = new LinkBatch( $titles );
                $lb->setCaller( __METHOD__ );
                $lb->execute();
        }

        /**
         * Get the current revision ID
         *
         * @return Integer
         */
        public function getRevisionId() {
                return $this->getOutput()->getRevisionId();
        }

        /**
         * Whether the revision displayed is the latest revision of the page
         *
         * @return Boolean
         */
        public function isRevisionCurrent() {
                $revID = $this->getRevisionId();
                return $revID == 0 || $revID == $this->getTitle()->getLatestRevID();
        }

        /**
         * Set the "relevant" title
         * @see self::getRelevantTitle()
         * @param $t Title object to use
         */
        public function setRelevantTitle( $t ) {
                $this->mRelevantTitle = $t;
        }

        /**
         * Return the "relevant" title.
         * A "relevant" title is not necessarily the actual title of the page.
         * Special pages like Special:MovePage use set the page they are acting on
         * as their "relevant" title, this allows the skin system to display things
         * such as content tabs which belong to to that page instead of displaying
         * a basic special page tab which has almost no meaning.
         *
         * @return Title
         */
        public function getRelevantTitle() {
                if ( isset($this->mRelevantTitle) ) {
                        return $this->mRelevantTitle;
                }
                return $this->getTitle();
        }

        /**
         * Set the "relevant" user
         * @see self::getRelevantUser()
         * @param $u User object to use
         */
        public function setRelevantUser( $u ) {
                $this->mRelevantUser = $u;
        }

        /**
         * Return the "relevant" user.
         * A "relevant" user is similar to a relevant title. Special pages like
         * Special:Contributions mark the user which they are relevant to so that
         * things like the toolbox can display the information they usually are only
         * able to display on a user's userpage and talkpage.
         * @return User
         */
        public function getRelevantUser() {
                if ( isset($this->mRelevantUser) ) {
                        return $this->mRelevantUser;
                }
                $title = $this->getRelevantTitle();
                if( $title->getNamespace() == NS_USER || $title->getNamespace() == NS_USER_TALK ) {
                        $rootUser = strtok( $title->getText(), '/' );
                        if ( User::isIP( $rootUser ) ) {
                                $this->mRelevantUser = User::newFromName( $rootUser, false );
                        } else {
                                $user = User::newFromName( $rootUser, false );
                                if ( $user && $user->isLoggedIn() ) {
                                        $this->mRelevantUser = $user;
                                }
                        }
                        return $this->mRelevantUser;
                }
                return null;
        }

        /**
         * Outputs the HTML generated by other functions.
         * @param $out OutputPage
         */
        abstract function outputPage( OutputPage $out = null );

        /**
         * @param $data array
         * @return string
         */
        static function makeVariablesScript( $data ) {
                if ( $data ) {
                        return Html::inlineScript(
                                ResourceLoader::makeLoaderConditionalScript( ResourceLoader::makeConfigSetScript( $data ) )
                        );
                } else {
                        return '';
                }
        }

        /**
         * Make a <script> tag containing global variables
         *
         * @deprecated in 1.19
         * @param $unused
         * @return string HTML fragment
         */
        public static function makeGlobalVariablesScript( $unused ) {
                global $wgOut;

                wfDeprecated( __METHOD__, '1.19' );

                return self::makeVariablesScript( $wgOut->getJSVars() );
        }

        /**
         * Get the query to generate a dynamic stylesheet
         *
         * @return array
         */
        public static function getDynamicStylesheetQuery() {
                global $wgSquidMaxage;

                return array(
                                'action' => 'raw',
                                'maxage' => $wgSquidMaxage,
                                'usemsgcache' => 'yes',
                                'ctype' => 'text/css',
                                'smaxage' => $wgSquidMaxage,
                        );
        }

        /**
         * Add skin specific stylesheets
         * Calling this method with an $out of anything but the same OutputPage
         * inside ->getOutput() is deprecated. The $out arg is kept
         * for compatibility purposes with skins.
         * @param $out OutputPage
         * @delete
         */
        abstract function setupSkinUserCss( OutputPage $out );

        /**
         * TODO: document
         * @param $title Title
         * @return String
         */
        function getPageClasses( $title ) {
                $numeric = 'ns-' . $title->getNamespace();

                if ( $title->isSpecialPage() ) {
                        $type = 'ns-special';
                        // bug 23315: provide a class based on the canonical special page name without subpages
                        list( $canonicalName ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
                        if ( $canonicalName ) {
                                $type .= ' ' . Sanitizer::escapeClass( "mw-special-$canonicalName" );
                        } else {
                                $type .= ' mw-invalidspecialpage';
                        }
                } elseif ( $title->isTalkPage() ) {
                        $type = 'ns-talk';
                } else {
                        $type = 'ns-subject';
                }

                $name = Sanitizer::escapeClass( 'page-' . $title->getPrefixedText() );

                return "$numeric $type $name";
        }

        /**
         * This will be called by OutputPage::headElement when it is creating the
         * <body> tag, skins can override it if they have a need to add in any
         * body attributes or classes of their own.
         * @param $out OutputPage
         * @param $bodyAttrs Array
         */
        function addToBodyAttributes( $out, &$bodyAttrs ) {
                // does nothing by default
        }

        /**
         * URL to the logo
         * @return String
         */
        function getLogo() {
                global $wgLogo;
                return $wgLogo;
        }

        /**
         * @return string
         */
        function getCategoryLinks() {
                global $wgUseCategoryBrowser;

                $out = $this->getOutput();
                $allCats = $out->getCategoryLinks();

                if ( !count( $allCats ) ) {
                        return '';
                }

                $embed = "<li>";
                $pop = "</li>";

                $s = '';
                $colon = $this->msg( 'colon-separator' )->escaped();

                if ( !empty( $allCats['normal'] ) ) {
                        $t = $embed . implode( "{$pop}{$embed}" , $allCats['normal'] ) . $pop;

                        $msg = $this->msg( 'pagecategories', count( $allCats['normal'] ) )->escaped();
                        $linkPage = wfMessage( 'pagecategorieslink' )->inContentLanguage()->text();
                        $s .= '<div id="mw-normal-catlinks" class="mw-normal-catlinks">' .
                                Linker::link( Title::newFromText( $linkPage ), $msg )
                                . $colon . '<ul>' . $t . '</ul>' . '</div>';
                }

                # Hidden categories
                if ( isset( $allCats['hidden'] ) ) {
                        if ( $this->getUser()->getBoolOption( 'showhiddencats' ) ) {
                                $class = ' mw-hidden-cats-user-shown';
                        } elseif ( $this->getTitle()->getNamespace() == NS_CATEGORY ) {
                                $class = ' mw-hidden-cats-ns-shown';
                        } else {
                                $class = ' mw-hidden-cats-hidden';
                        }

                        $s .= "<div id=\"mw-hidden-catlinks\" class=\"mw-hidden-catlinks$class\">" .
                                $this->msg( 'hidden-categories', count( $allCats['hidden'] ) )->escaped() .
                                $colon . '<ul>' . $embed . implode( "{$pop}{$embed}" , $allCats['hidden'] ) . $pop . '</ul>' .
                                '</div>';
                }

                # optional 'dmoz-like' category browser. Will be shown under the list
                # of categories an article belong to
                if ( $wgUseCategoryBrowser ) {
                        $s .= '<br /><hr />';

                        # get a big array of the parents tree
                        $parenttree = $this->getTitle()->getParentCategoryTree();
                        # Skin object passed by reference cause it can not be
                        # accessed under the method subfunction drawCategoryBrowser
                        $tempout = explode( "\n", $this->drawCategoryBrowser( $parenttree ) );
                        # Clean out bogus first entry and sort them
                        unset( $tempout[0] );
                        asort( $tempout );
                        # Output one per line
                        $s .= implode( "<br />\n", $tempout );
                }

                return $s;
        }

        /**
         * Render the array as a serie of links.
         * @param $tree Array: categories tree returned by Title::getParentCategoryTree
         * @return String separated by &gt;, terminate with "\n"
         */
        function drawCategoryBrowser( $tree ) {
                $return = '';

                foreach ( $tree as $element => $parent ) {
                        if ( empty( $parent ) ) {
                                # element start a new list
                                $return .= "\n";
                        } else {
                                # grab the others elements
                                $return .= $this->drawCategoryBrowser( $parent ) . ' &gt; ';
                        }

                        # add our current element to the list
                        $eltitle = Title::newFromText( $element );
                        $return .=  Linker::link( $eltitle, htmlspecialchars( $eltitle->getText() ) );
                }

                return $return;
        }

        /**
         * @return string
         */
        function getCategories() {
                $out = $this->getOutput();

                $catlinks = $this->getCategoryLinks();

                $classes = 'catlinks';

                // Check what we're showing
                $allCats = $out->getCategoryLinks();
                $showHidden = $this->getUser()->getBoolOption( 'showhiddencats' ) ||
                                                $this->getTitle()->getNamespace() == NS_CATEGORY;

                if ( empty( $allCats['normal'] ) && !( !empty( $allCats['hidden'] ) && $showHidden ) ) {
                        $classes .= ' catlinks-allhidden';
                }

                return "<div id='catlinks' class='$classes'>{$catlinks}</div>";
        }

        /**
         * This runs a hook to allow extensions placing their stuff after content
         * and article metadata (e.g. categories).
         * Note: This function has nothing to do with afterContent().
         *
         * This hook is placed here in order to allow using the same hook for all
         * skins, both the SkinTemplate based ones and the older ones, which directly
         * use this class to get their data.
         *
         * The output of this function gets processed in SkinTemplate::outputPage() for
         * the SkinTemplate based skins, all other skins should directly echo it.
         *
         * @return String, empty by default, if not changed by any hook function.
         */
        protected function afterContentHook() {
                $data = '';

                if ( wfRunHooks( 'SkinAfterContent', array( &$data, $this ) ) ) {
                        // adding just some spaces shouldn't toggle the output
                        // of the whole <div/>, so we use trim() here
                        if ( trim( $data ) != '' ) {
                                // Doing this here instead of in the skins to
                                // ensure that the div has the same ID in all
                                // skins
                                $data = "<div id='mw-data-after-content'>\n" .
                                        "\t$data\n" .
                                        "</div>\n";
                        }
                } else {
                        wfDebug( "Hook SkinAfterContent changed output processing.\n" );
                }

                return $data;
        }

        /**
         * Generate debug data HTML for displaying at the bottom of the main content
         * area.
         * @return String HTML containing debug data, if enabled (otherwise empty).
         */
        protected function generateDebugHTML() {
                global $wgShowDebug;

                $html = MWDebug::getDebugHTML( $this->getContext() );

                if ( $wgShowDebug ) {
                        $listInternals = $this->formatDebugHTML( $this->getOutput()->mDebugtext );
                        $html .= "\n<hr />\n<strong>Debug data:</strong><ul id=\"mw-debug-html\">" .
                                $listInternals . "</ul>\n";
                }

                return $html;
        }

        /**
         * @param $debugText string
         * @return string
         */
        private function formatDebugHTML( $debugText ) {
                global $wgDebugTimestamps;

                $lines = explode( "\n", $debugText );
                $curIdent = 0;
                $ret = '<li>';

                foreach ( $lines as $line ) {
                        $pre = '';
                        if ( $wgDebugTimestamps ) {
                                $matches = array();
                                if ( preg_match( '/^(\d+\.\d+ {1,3}\d+.\dM\s{2})/', $line, $matches ) ) {
                                        $pre = $matches[1];
                                        $line = substr( $line, strlen( $pre ) );
                                }
                        }
                        $display = ltrim( $line );
                        $ident = strlen( $line ) - strlen( $display );
                        $diff = $ident - $curIdent;

                        $display = $pre . $display;
                        if ( $display == '' ) {
                                $display = "\xc2\xa0";
                        }

                        if ( !$ident && $diff < 0 && substr( $display, 0, 9 ) != 'Entering ' && substr( $display, 0, 8 ) != 'Exiting ' ) {
                                $ident = $curIdent;
                                $diff = 0;
                                $display = '<span style="background:yellow;">' . htmlspecialchars( $display ) . '</span>';
                        } else {
                                $display = htmlspecialchars( $display );
                        }

                        if ( $diff < 0 ) {
                                $ret .= str_repeat( "</li></ul>\n", -$diff ) . "</li><li>\n";
                        } elseif ( $diff == 0 ) {
                                $ret .= "</li><li>\n";
                        } else {
                                $ret .= str_repeat( "<ul><li>\n", $diff );
                        }
                        $ret .= "<tt>$display</tt>\n";

                        $curIdent = $ident;
                }

                $ret .= str_repeat( '</li></ul>', $curIdent ) . '</li>';

                return $ret;
        }

        /**
         * This gets called shortly before the </body> tag.
         *
         * @return String HTML-wrapped JS code to be put before </body>
         */
        function bottomScripts() {
                // TODO and the suckage continues. This function is really just a wrapper around
                // OutputPage::getBottomScripts() which takes a Skin param. This should be cleaned
                // up at some point
                $bottomScriptText = $this->getOutput()->getBottomScripts();
                wfRunHooks( 'SkinAfterBottomScripts', array( $this, &$bottomScriptText ) );

                return $bottomScriptText;
        }

        /**
         * Text with the permalink to the source page,
         * usually shown on the footer of a printed page
         *
         * @return string HTML text with an URL
         */
        function printSource() {
                $oldid = $this->getRevisionId();
                if ( $oldid ) {
                        $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL( 'oldid=' . $oldid ) ) );
                } else {
                        // oldid not available for non existing pages
                        $url = htmlspecialchars( wfExpandIRI( $this->getTitle()->getCanonicalURL() ) );
                }
                return $this->msg( 'retrievedfrom', '<a href="' . $url . '">' . $url . '</a>' )->text();
        }

        /**
         * @return String
         */
        function getUndeleteLink() {
                $action = $this->getRequest()->getVal( 'action', 'view' );

                if ( $this->getUser()->isAllowed( 'deletedhistory' ) &&
                        ( $this->getTitle()->getArticleID() == 0 || $action == 'history' ) ) {
                        $n = $this->getTitle()->isDeleted();


                        if ( $n ) {
                                if ( $this->getUser()->isAllowed( 'undelete' ) ) {
                                        $msg = 'thisisdeleted';
                                } else {
                                        $msg = 'viewdeleted';
                                }

                                return $this->msg( $msg )->rawParams(
                                        Linker::linkKnown(
                                                SpecialPage::getTitleFor( 'Undelete', $this->getTitle()->getPrefixedDBkey() ),
                                                $this->msg( 'restorelink' )->numParams( $n )->escaped() )
                                        )->text();
                        }
                }

                return '';
        }

        /**
         * @return string
         */
        function subPageSubtitle() {
                global $wgLang;
                $out = $this->getOutput();
                $subpages = '';

                if ( !wfRunHooks( 'SkinSubPageSubtitle', array( &$subpages, $this, $out ) ) ) {
                        return $subpages;
                }

                if ( $out->isArticle() && MWNamespace::hasSubpages( $out->getTitle()->getNamespace() ) ) {
                        $ptext = $this->getTitle()->getPrefixedText();
                        if ( preg_match( '/\//', $ptext ) ) {
                                $links = explode( '/', $ptext );
                                array_pop( $links );
                                $c = 0;
                                $growinglink = '';
                                $display = '';

                                foreach ( $links as $link ) {
                                        $growinglink .= $link;
                                        $display .= $link;
                                        $linkObj = Title::newFromText( $growinglink );

                                        if ( is_object( $linkObj ) && $linkObj->exists() ) {
                                                $getlink = Linker::linkKnown(
                                                        $linkObj,
                                                        htmlspecialchars( $display )
                                                );

                                                $c++;

                                                if ( $c > 1 ) {
                                                        $subpages .= $wgLang->getDirMarkEntity() . $this->msg( 'pipe-separator' )->escaped();
                                                } else  {
                                                        $subpages .= '&lt; ';
                                                }

                                                $subpages .= $getlink;
                                                $display = '';
                                        } else {
                                                $display .= '/';
                                        }
                                        $growinglink .= '/';
                                }
                        }
                }

                return $subpages;
        }

        /**
         * Returns true if the IP should be shown in the header
         * @return Bool
         */
        function showIPinHeader() {
                global $wgShowIPinHeader;
                return $wgShowIPinHeader && session_id() != '';
        }

        /**
         * @return String
         */
        function getSearchLink() {
                $searchPage = SpecialPage::getTitleFor( 'Search' );
                return $searchPage->getLocalURL();
        }

        /**
         * @return string
         */
        function escapeSearchLink() {
                return htmlspecialchars( $this->getSearchLink() );
        }

        /**
         * @param $type string
         * @return string
         */
        function getCopyright( $type = 'detect' ) {
                global $wgRightsPage, $wgRightsUrl, $wgRightsText, $wgContLang;

                if ( $type == 'detect' ) {
                        if ( !$this->isRevisionCurrent() && !$this->msg( 'history_copyright' )->inContentLanguage()->isDisabled() ) {
                                $type = 'history';
                        } else {
                                $type = 'normal';
                        }
                }

                if ( $type == 'history' ) {
                        $msg = 'history_copyright';
                } else {
                        $msg = 'copyright';
                }

                if ( $wgRightsPage ) {
                        $title = Title::newFromText( $wgRightsPage );
                        $link = Linker::linkKnown( $title, $wgRightsText );
                } elseif ( $wgRightsUrl ) {
                        $link = Linker::makeExternalLink( $wgRightsUrl, $wgRightsText );
                } elseif ( $wgRightsText ) {
                        $link = $wgRightsText;
                } else {
                        # Give up now
                        return '';
                }

                // Allow for site and per-namespace customization of copyright notice.
                $forContent = true;

                wfRunHooks( 'SkinCopyrightFooter', array( $this->getTitle(), $type, &$msg, &$link, &$forContent ) );

                $msgObj = $this->msg( $msg )->rawParams( $link );
                if ( $forContent ) {
                        $msg = $msgObj->inContentLanguage()->text();
                        if ( $this->getLanguage()->getCode() !== $wgContLang->getCode() ) {
                                $msg = Html::rawElement( 'span', array( 'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $msg );
                        }
                        return $msg;
                } else {
                        return $msgObj->text();
                }
        }

        /**
         * @return null|string
         */
        function getCopyrightIcon() {
                global $wgRightsUrl, $wgRightsText, $wgRightsIcon, $wgCopyrightIcon;

                $out = '';

                if ( isset( $wgCopyrightIcon ) && $wgCopyrightIcon ) {
                        $out = $wgCopyrightIcon;
                } elseif ( $wgRightsIcon ) {
                        $icon = htmlspecialchars( $wgRightsIcon );

                        if ( $wgRightsUrl ) {
                                $url = htmlspecialchars( $wgRightsUrl );
                                $out .= '<a href="' . $url . '">';
                        }

                        $text = htmlspecialchars( $wgRightsText );
                        $out .= "<img src=\"$icon\" alt=\"$text\" width=\"88\" height=\"31\" />";

                        if ( $wgRightsUrl ) {
                                $out .= '</a>';
                        }
                }

                return $out;
        }

        /**
         * Gets the powered by MediaWiki icon.
         * @return string
         */
        function getPoweredBy() {
                global $wgStylePath;

                $url = htmlspecialchars( "$wgStylePath/common/images/poweredby_mediawiki_88x31.png" );
                $text = '<a href="//www.mediawiki.org/"><img src="' . $url . '" height="31" width="88" alt="Powered by MediaWiki" /></a>';
                wfRunHooks( 'SkinGetPoweredBy', array( &$text, $this ) );
                return $text;
        }

        /**
         * Get the timestamp of the latest revision, formatted in user language
         *
         * @return String
         */
        protected function lastModified() {
                $timestamp = $this->getOutput()->getRevisionTimestamp();

                # No cached timestamp, load it from the database
                if ( $timestamp === null ) {
                        $timestamp = Revision::getTimestampFromId( $this->getTitle(), $this->getRevisionId() );
                }

                if ( $timestamp ) {
                        $d = $this->getLanguage()->userDate( $timestamp, $this->getUser() );
                        $t = $this->getLanguage()->userTime( $timestamp, $this->getUser() );
                        $s = ' ' . $this->msg( 'lastmodifiedat', $d, $t )->text();
                } else {
                        $s = '';
                }

                if ( wfGetLB()->getLaggedSlaveMode() ) {
                        $s .= ' <strong>' . $this->msg( 'laggedslavemode' )->text() . '</strong>';
                }

                return $s;
        }

        /**
         * @param $align string
         * @return string
         */
        function logoText( $align = '' ) {
                if ( $align != '' ) {
                        $a = " align='{$align}'";
                } else {
                        $a = '';
                }

                $mp = $this->msg( 'mainpage' )->escaped();
                $mptitle = Title::newMainPage();
                $url = ( is_object( $mptitle ) ? htmlspecialchars( $mptitle->getLocalURL() ) : '' );

                $logourl = $this->getLogo();
                $s = "<a href='{$url}'><img{$a} src='{$logourl}' alt='[{$mp}]' /></a>";

                return $s;
        }

        /**
         * Renders a $wgFooterIcons icon acording to the method's arguments
         * @param $icon Array: The icon to build the html for, see $wgFooterIcons for the format of this array
         * @param $withImage Bool|String: Whether to use the icon's image or output a text-only footericon
         * @return String HTML
         */
        function makeFooterIcon( $icon, $withImage = 'withImage' ) {
                if ( is_string( $icon ) ) {
                        $html = $icon;
                } else { // Assuming array
                        $url = isset($icon["url"]) ? $icon["url"] : null;
                        unset( $icon["url"] );
                        if ( isset( $icon["src"] ) && $withImage === 'withImage' ) {
                                $html = Html::element( 'img', $icon ); // do this the lazy way, just pass icon data as an attribute array
                        } else {
                                $html = htmlspecialchars( $icon["alt"] );
                        }
                        if ( $url ) {
                                $html = Html::rawElement( 'a', array( "href" => $url ), $html );
                        }
                }
                return $html;
        }

        /**
         * Gets the link to the wiki's main page.
         * @return string
         */
        function mainPageLink() {
                $s = Linker::linkKnown(
                        Title::newMainPage(),
                        $this->msg( 'mainpage' )->escaped()
                );

                return $s;
        }

        /**
         * @param $desc
         * @param $page
         * @return string
         */
        public function footerLink( $desc, $page ) {
                // if the link description has been set to "-" in the default language,
                if ( $this->msg( $desc )->inContentLanguage()->isDisabled() ) {
                        // then it is disabled, for all languages.
                        return '';
                } else {
                        // Otherwise, we display the link for the user, described in their
                        // language (which may or may not be the same as the default language),
                        // but we make the link target be the one site-wide page.
                        $title = Title::newFromText( $this->msg( $page )->inContentLanguage()->text() );

                        return Linker::linkKnown(
                                $title,
                                $this->msg( $desc )->escaped()
                        );
                }
        }

        /**
         * Gets the link to the wiki's privacy policy page.
         * @return String HTML
         */
        function privacyLink() {
                return $this->footerLink( 'privacy', 'privacypage' );
        }

        /**
         * Gets the link to the wiki's about page.
         * @return String HTML
         */
        function aboutLink() {
                return $this->footerLink( 'aboutsite', 'aboutpage' );
        }

        /**
         * Gets the link to the wiki's general disclaimers page.
         * @return String HTML
         */
        function disclaimerLink() {
                return $this->footerLink( 'disclaimers', 'disclaimerpage' );
        }

        /**
         * Return URL options for the 'edit page' link.
         * This may include an 'oldid' specifier, if the current page view is such.
         *
         * @return array
         * @private
         */
        function editUrlOptions() {
                $options = array( 'action' => 'edit' );

                if ( !$this->isRevisionCurrent() ) {
                        $options['oldid'] = intval( $this->getRevisionId() );
                }

                return $options;
        }

        /**
         * @param $id User|int
         * @return bool
         */
        function showEmailUser( $id ) {
                if ( $id instanceof User ) {
                        $targetUser = $id;
                } else {
                        $targetUser = User::newFromId( $id );
                }
                return $this->getUser()->canSendEmail() && # the sending user must have a confirmed email address
                        $targetUser->canReceiveEmail(); # the target user must have a confirmed email address and allow emails from users
        }

        /**
         * Return a fully resolved style path url to images or styles stored in the common folder.
         * This method returns a url resolved using the configured skin style path
         * and includes the style version inside of the url.
         * @param $name String: The name or path of a skin resource file
         * @return String The fully resolved style path url including styleversion
         */
        function getCommonStylePath( $name ) {
                global $wgStylePath, $wgStyleVersion;
                return "$wgStylePath/common/$name?$wgStyleVersion";
        }

        /**
         * Return a fully resolved style path url to images or styles stored in the curent skins's folder.
         * This method returns a url resolved using the configured skin style path
         * and includes the style version inside of the url.
         * @param $name String: The name or path of a skin resource file
         * @return String The fully resolved style path url including styleversion
         */
        function getSkinStylePath( $name ) {
                global $wgStylePath, $wgStyleVersion;
                return "$wgStylePath/{$this->stylename}/$name?$wgStyleVersion";
        }

        /* these are used extensively in SkinTemplate, but also some other places */

        /**
         * @param $urlaction string
         * @return String
         */
        static function makeMainPageUrl( $urlaction = '' ) {
                $title = Title::newMainPage();
                self::checkTitle( $title, '' );

                return $title->getLocalURL( $urlaction );
        }

        /**
         * @param $name string
         * @param $urlaction string
         * @return String
         */
        static function makeSpecialUrl( $name, $urlaction = '' ) {
                $title = SpecialPage::getSafeTitleFor( $name );
                return $title->getLocalURL( $urlaction );
        }

        /**
         * @param $name string
         * @param $subpage string
         * @param $urlaction string
         * @return String
         */
        static function makeSpecialUrlSubpage( $name, $subpage, $urlaction = '' ) {
                $title = SpecialPage::getSafeTitleFor( $name, $subpage );
                return $title->getLocalURL( $urlaction );
        }

        /**
         * @param $name string
         * @param $urlaction string
         * @return String
         */
        static function makeI18nUrl( $name, $urlaction = '' ) {
                $title = Title::newFromText( wfMsgForContent( $name ) );
                self::checkTitle( $title, $name );
                return $title->getLocalURL( $urlaction );
        }

        /**
         * @param $name string
         * @param $urlaction string
         * @return String
         */
        static function makeUrl( $name, $urlaction = '' ) {
                $title = Title::newFromText( $name );
                self::checkTitle( $title, $name );

                return $title->getLocalURL( $urlaction );
        }

        /**
         * If url string starts with http, consider as external URL, else
         * internal
         * @param $name String
         * @return String URL
         */
        static function makeInternalOrExternalUrl( $name ) {
                if ( preg_match( '/^(?:' . wfUrlProtocols() . ')/', $name ) ) {
                        return $name;
                } else {
                        return self::makeUrl( $name );
                }
        }

        /**
         * this can be passed the NS number as defined in Language.php
         * @param $name
         * @param $urlaction string
         * @param $namespace int
         * @return String
         */
        static function makeNSUrl( $name, $urlaction = '', $namespace = NS_MAIN ) {
                $title = Title::makeTitleSafe( $namespace, $name );
                self::checkTitle( $title, $name );

                return $title->getLocalURL( $urlaction );
        }

        /**
         * these return an array with the 'href' and boolean 'exists'
         * @param $name
         * @param $urlaction string
         * @return array
         */
        static function makeUrlDetails( $name, $urlaction = '' ) {
                $title = Title::newFromText( $name );
                self::checkTitle( $title, $name );

                return array(
                        'href' => $title->getLocalURL( $urlaction ),
                        'exists' => $title->getArticleID() != 0,
                );
        }

        /**
         * Make URL details where the article exists (or at least it's convenient to think so)
         * @param $name String Article name
         * @param $urlaction String
         * @return Array
         */
        static function makeKnownUrlDetails( $name, $urlaction = '' ) {
                $title = Title::newFromText( $name );
                self::checkTitle( $title, $name );

                return array(
                        'href' => $title->getLocalURL( $urlaction ),
                        'exists' => true
                );
        }

        /**
         * make sure we have some title to operate on
         *
         * @param $title Title
         * @param $name string
         */
        static function checkTitle( &$title, $name ) {
                if ( !is_object( $title ) ) {
                        $title = Title::newFromText( $name );
                        if ( !is_object( $title ) ) {
                                $title = Title::newFromText( '--error: link target missing--' );
                        }
                }
        }

        /**
         * Build an array that represents the sidebar(s), the navigation bar among them
         *
         * @return array
         */
        function buildSidebar() {
                global $wgMemc, $wgEnableSidebarCache, $wgSidebarCacheExpiry;
                wfProfileIn( __METHOD__ );

                $key = wfMemcKey( 'sidebar', $this->getLanguage()->getCode() );

                if ( $wgEnableSidebarCache ) {
                        $cachedsidebar = $wgMemc->get( $key );
                        if ( $cachedsidebar ) {
                                wfProfileOut( __METHOD__ );
                                return $cachedsidebar;
                        }
                }

                $bar = array();
                $this->addToSidebar( $bar, 'sidebar' );

                wfRunHooks( 'SkinBuildSidebar', array( $this, &$bar ) );
                if ( $wgEnableSidebarCache ) {
                        $wgMemc->set( $key, $bar, $wgSidebarCacheExpiry );
                }

                wfProfileOut( __METHOD__ );
                return $bar;
        }
        /**
         * Add content from a sidebar system message
         * Currently only used for MediaWiki:Sidebar (but may be used by Extensions)
         *
         * This is just a wrapper around addToSidebarPlain() for backwards compatibility
         *
         * @param $bar array
         * @param $message String
         */
        function addToSidebar( &$bar, $message ) {
                $this->addToSidebarPlain( $bar, wfMsgForContentNoTrans( $message ) );
        }

        /**
         * Add content from plain text
         * @since 1.17
         * @param $bar array
         * @param $text string
         * @return Array
         */
        function addToSidebarPlain( &$bar, $text ) {
                $lines = explode( "\n", $text );

                $heading = '';

                foreach ( $lines as $line ) {
                        if ( strpos( $line, '*' ) !== 0 ) {
                                continue;
                        }
                        $line = rtrim( $line, "\r" ); // for Windows compat

                        if ( strpos( $line, '**' ) !== 0 ) {
                                $heading = trim( $line, '* ' );
                                if ( !array_key_exists( $heading, $bar ) ) {
                                        $bar[$heading] = array();
                                }
                        } else {
                                $line = trim( $line, '* ' );

                                if ( strpos( $line, '|' ) !== false ) { // sanity check
                                        $line = MessageCache::singleton()->transform( $line, false, null, $this->getTitle() );
                                        $line = array_map( 'trim', explode( '|', $line, 2 ) );
                                        if ( count( $line ) !== 2 ) {
                                                // Second sanity check, could be hit by people doing
                                                // funky stuff with parserfuncs... (bug 33321)
                                                continue;
                                        }

                                        $extraAttribs = array();

                                        $msgLink = $this->msg( $line[0] )->inContentLanguage();
                                        if ( $msgLink->exists() ) {
                                                $link = $msgLink->text();
                                                if ( $link == '-' ) {
                                                        continue;
                                                }
                                        } else {
                                                $link = $line[0];
                                        }
                                        $msgText = $this->msg( $line[1] );
                                        if ( $msgText->exists() ) {
                                                $text = $msgText->text();
                                        } else {
                                                $text = $line[1];
                                        }

                                        if ( preg_match( '/^(?:' . wfUrlProtocols() . ')/', $link ) ) {
                                                $href = $link;

                                                // Parser::getExternalLinkAttribs won't work here because of the Namespace things
                                                global $wgNoFollowLinks, $wgNoFollowDomainExceptions;
                                                if ( $wgNoFollowLinks && !wfMatchesDomainList( $href, $wgNoFollowDomainExceptions ) ) {
                                                        $extraAttribs['rel'] = 'nofollow';
                                                }

                                                global $wgExternalLinkTarget;
                                                if ( $wgExternalLinkTarget) {
                                                        $extraAttribs['target'] = $wgExternalLinkTarget;
                                                }
                                        } else {
                                                $title = Title::newFromText( $link );

                                                if ( $title ) {
                                                        $title = $title->fixSpecialName();
                                                        $href = $title->getLinkURL();
                                                } else {
                                                        $href = 'INVALID-TITLE';
                                                }
                                        }

                                        $bar[$heading][] = array_merge( array(
                                                'text' => $text,
                                                'href' => $href,
                                                'id' => 'n-' . Sanitizer::escapeId( strtr( $line[1], ' ', '-' ), 'noninitial' ),
                                                'active' => false
                                        ), $extraAttribs );
                                } else {
                                        continue;
                                }
                        }
                }

                return $bar;
        }

        /**
         * Should we load mediawiki.legacy.wikiprintable?  Skins that have their own
         * print stylesheet should override this and return false.  (This is an
         * ugly hack to get Monobook to play nicely with OutputPage::headElement().)
         *
         * @return bool
         */
        public function commonPrintStylesheet() {
                return true;
        }

        /**
         * Gets new talk page messages for the current user.
         * @return MediaWiki message or if no new talk page messages, nothing
         */
        function getNewtalks() {
                $out = $this->getOutput();

                $newtalks = $this->getUser()->getNewMessageLinks();
                $ntl = '';

                if ( count( $newtalks ) == 1 && $newtalks[0]['wiki'] === wfWikiID() ) {
                        $userTitle = $this->getUser()->getUserPage();
                        $userTalkTitle = $userTitle->getTalkPage();

                        if ( !$userTalkTitle->equals( $out->getTitle() ) ) {
                                $newMessagesLink = Linker::linkKnown(
                                        $userTalkTitle,
                                        $this->msg( 'newmessageslink' )->escaped(),
                                        array(),
                                        array( 'redirect' => 'no' )
                                );

                                $newMessagesDiffLink = Linker::linkKnown(
                                        $userTalkTitle,
                                        $this->msg( 'newmessagesdifflink' )->escaped(),
                                        array(),
                                        array( 'diff' => 'cur' )
                                );

                                $ntl = $this->msg(
                                        'youhavenewmessages',
                                        $newMessagesLink,
                                        $newMessagesDiffLink
                                )->text();
                                # Disable Squid cache
                                $out->setSquidMaxage( 0 );
                        }
                } elseif ( count( $newtalks ) ) {
                        // _>" " for BC <= 1.16
                        $sep = str_replace( '_', ' ', $this->msg( 'newtalkseparator' )->escaped() );
                        $msgs = array();

                        foreach ( $newtalks as $newtalk ) {
                                $msgs[] = Xml::element(
                                        'a',
                                        array( 'href' => $newtalk['link'] ), $newtalk['wiki']
                                );
                        }
                        $parts = implode( $sep, $msgs );
                        $ntl = $this->msg( 'youhavenewmessagesmulti' )->rawParams( $parts )->escaped();
                        $out->setSquidMaxage( 0 );
                }

                return $ntl;
        }

        /**
         * Get a cached notice
         *
         * @param $name String: message name, or 'default' for $wgSiteNotice
         * @return String: HTML fragment
         */
        private function getCachedNotice( $name ) {
                global $wgRenderHashAppend, $parserMemc, $wgContLang;

                wfProfileIn( __METHOD__ );

                $needParse = false;

                if( $name === 'default' ) {
                        // special case
                        global $wgSiteNotice;
                        $notice = $wgSiteNotice;
                        if( empty( $notice ) ) {
                                wfProfileOut( __METHOD__ );
                                return false;
                        }
                } else {
                        $msg = $this->msg( $name )->inContentLanguage();
                        if( $msg->isDisabled() ) {
                                wfProfileOut( __METHOD__ );
                                return false;
                        }
                        $notice = $msg->plain();
                }

                // Use the extra hash appender to let eg SSL variants separately cache.
                $key = wfMemcKey( $name . $wgRenderHashAppend );
                $cachedNotice = $parserMemc->get( $key );
                if( is_array( $cachedNotice ) ) {
                        if( md5( $notice ) == $cachedNotice['hash'] ) {
                                $notice = $cachedNotice['html'];
                        } else {
                                $needParse = true;
                        }
                } else {
                        $needParse = true;
                }

                if ( $needParse ) {
                        $parsed = $this->getOutput()->parse( $notice );
                        $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
                        $notice = $parsed;
                }

                $notice = Html::rawElement( 'div', array( 'id' => 'localNotice',
                        'lang' => $wgContLang->getHtmlCode(), 'dir' => $wgContLang->getDir() ), $notice );
                wfProfileOut( __METHOD__ );
                return $notice;
        }

        /**
         * Get a notice based on page's namespace
         *
         * @return String: HTML fragment
         */
        function getNamespaceNotice() {
                wfProfileIn( __METHOD__ );

                $key = 'namespacenotice-' . $this->getTitle()->getNsText();
                $namespaceNotice = $this->getCachedNotice( $key );
                if ( $namespaceNotice && substr( $namespaceNotice, 0, 7 ) != '<p>&lt;' ) {
                        $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . '</div>';
                } else {
                        $namespaceNotice = '';
                }

                wfProfileOut( __METHOD__ );
                return $namespaceNotice;
        }

        /**
         * Get the site notice
         *
         * @return String: HTML fragment
         */
        function getSiteNotice() {
                wfProfileIn( __METHOD__ );
                $siteNotice = '';

                if ( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice, $this ) ) ) {
                        if ( is_object( $this->getUser() ) && $this->getUser()->isLoggedIn() ) {
                                $siteNotice = $this->getCachedNotice( 'sitenotice' );
                        } else {
                                $anonNotice = $this->getCachedNotice( 'anonnotice' );
                                if ( !$anonNotice ) {
                                        $siteNotice = $this->getCachedNotice( 'sitenotice' );
                                } else {
                                        $siteNotice = $anonNotice;
                                }
                        }
                        if ( !$siteNotice ) {
                                $siteNotice = $this->getCachedNotice( 'default' );
                        }
                }

                wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice, $this ) );
                wfProfileOut( __METHOD__ );
                return $siteNotice;
        }

        /**
         * Create a section edit link.  This supersedes editSectionLink() and
         * editSectionLinkForOther().
         *
         * @param $nt      Title  The title being linked to (may not be the same as
         *   $wgTitle, if the section is included from a template)
         * @param $section string The designation of the section being pointed to,
         *   to be included in the link, like "&section=$section"
         * @param $tooltip string The tooltip to use for the link: will be escaped
         *   and wrapped in the 'editsectionhint' message
         * @param $lang    string Language code
         * @return         string HTML to use for edit link
         */
        public function doEditSectionLink( Title $nt, $section, $tooltip = null, $lang = false ) {
                // HTML generated here should probably have userlangattributes
                // added to it for LTR text on RTL pages
                $attribs = array();
                if ( !is_null( $tooltip ) ) {
                        # Bug 25462: undo double-escaping.
                        $tooltip = Sanitizer::decodeCharReferences( $tooltip );
                        $attribs['title'] = wfMsgExt( 'editsectionhint', array( 'language' => $lang, 'parsemag', 'replaceafter' ), $tooltip );
                }
                $link = Linker::link( $nt, wfMsgExt( 'editsection', array( 'language' => $lang ) ),
                        $attribs,
                        array( 'action' => 'edit', 'section' => $section ),
                        array( 'noclasses', 'known' )
                );

                # Run the old hook.  This takes up half of the function . . . hopefully
                # we can rid of it someday.
                $attribs = '';
                if ( $tooltip ) {
                        $attribs = wfMsgExt( 'editsectionhint', array( 'language' => $lang, 'parsemag', 'escape', 'replaceafter' ), $tooltip );
                        $attribs = " title=\"$attribs\"";
                }
                $result = null;
                wfRunHooks( 'EditSectionLink', array( &$this, $nt, $section, $attribs, $link, &$result, $lang ) );
                if ( !is_null( $result ) ) {
                        # For reverse compatibility, add the brackets *after* the hook is
                        # run, and even add them to hook-provided text.  (This is the main
                        # reason that the EditSectionLink hook is deprecated in favor of
                        # DoEditSectionLink: it can't change the brackets or the span.)
                        $result = wfMsgExt( 'editsection-brackets', array( 'escape', 'replaceafter', 'language' => $lang ), $result );
                        return "<span class=\"editsection\">$result</span>";
                }

                # Add the brackets and the span, and *then* run the nice new hook, with
                # clean and non-redundant arguments.
                $result = wfMsgExt( 'editsection-brackets', array( 'escape', 'replaceafter', 'language' => $lang ), $link );
                $result = "<span class=\"editsection\">$result</span>";

                wfRunHooks( 'DoEditSectionLink', array( $this, $nt, $section, $tooltip, &$result, $lang ) );
                return $result;
        }

        /**
         * Use PHP's magic __call handler to intercept legacy calls to the linker
         * for backwards compatibility.
         *
         * @param $fname String Name of called method
         * @param $args Array Arguments to the method
         * @return mixed
         */
        function __call( $fname, $args ) {
                $realFunction = array( 'Linker', $fname );
                if ( is_callable( $realFunction ) ) {
                        return call_user_func_array( $realFunction, $args );
                } else {
                        $className = get_class( $this );
                        throw new MWException( "Call to undefined method $className::$fname" );
                }
        }

}