Linker.php

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<?php
class Linker {
    const TOOL_LINKS_NOBLOCK = 1;
    const TOOL_LINKS_EMAIL = 2;

    static function getExternalLinkAttributes( $class = 'external' ) {
        wfDeprecated( __METHOD__, '1.18' );
        return self::getLinkAttributesInternal( '', $class );
    }

    static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
        global $wgContLang;

        # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
        # getExternalLinkAttributes, why?
        $title = urldecode( $title );
        $title = $wgContLang->checkTitleEncoding( $title );
        $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );

        return self::getLinkAttributesInternal( $title, $class );
    }

    static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
        $title = urldecode( $title );
        $title = str_replace( '_', ' ', $title );
        return self::getLinkAttributesInternal( $title, $class );
    }

    static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
        if ( $title === false ) {
            $title = $nt->getPrefixedText();
        }
        return self::getLinkAttributesInternal( $title, $class );
    }

    private static function getLinkAttributesInternal( $title, $class ) {
        $title = htmlspecialchars( $title );
        $class = htmlspecialchars( $class );
        $r = '';
        if ( $class != '' ) {
            $r .= " class=\"$class\"";
        }
        if ( $title != '' ) {
            $r .= " title=\"$title\"";
        }
        return $r;
    }

    public static function getLinkColour( $t, $threshold ) {
        $colour = '';
        if ( $t->isRedirect() ) {
            # Page is a redirect
            $colour = 'mw-redirect';
        } elseif ( $threshold > 0 && $t->isContentPage() &&
            $t->exists() && $t->getLength() < $threshold
        ) {
            # Page is a stub
            $colour = 'stub';
        }
        return $colour;
    }

    public static function link(
        $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
    ) {
        if ( !$target instanceof Title ) {
            wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
            return "<!-- ERROR -->$html";
        }
        wfProfileIn( __METHOD__ );

        if ( is_string( $query ) ) {
            // some functions withing core using this still hand over query strings
            wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
            $query = wfCgiToArray( $query );
        }
        $options = (array)$options;

        $dummy = new DummyLinker; // dummy linker instance for bc on the hooks

        $ret = null;
        if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
        &$customAttribs, &$query, &$options, &$ret ) ) ) {
            wfProfileOut( __METHOD__ );
            return $ret;
        }

        # Normalize the Title if it's a special page
        $target = self::normaliseSpecialPage( $target );

        # If we don't know whether the page exists, let's find out.
        wfProfileIn( __METHOD__ . '-checkPageExistence' );
        if ( !in_array( 'known', $options ) and !in_array( 'broken', $options ) ) {
            if ( $target->isKnown() ) {
                $options[] = 'known';
            } else {
                $options[] = 'broken';
            }
        }
        wfProfileOut( __METHOD__ . '-checkPageExistence' );

        $oldquery = array();
        if ( in_array( "forcearticlepath", $options ) && $query ) {
            $oldquery = $query;
            $query = array();
        }

        # Note: we want the href attribute first, for prettiness.
        $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
        if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
            $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
        }

        $attribs = array_merge(
            $attribs,
            self::linkAttribs( $target, $customAttribs, $options )
        );
        if ( is_null( $html ) ) {
            $html = self::linkText( $target );
        }

        $ret = null;
        if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
            $ret = Html::rawElement( 'a', $attribs, $html );
        }

        wfProfileOut( __METHOD__ );
        return $ret;
    }

    public static function linkKnown(
        $target, $html = null, $customAttribs = array(),
        $query = array(), $options = array( 'known', 'noclasses' )
    ) {
        return self::link( $target, $html, $customAttribs, $query, $options );
    }

    private static function linkUrl( $target, $query, $options ) {
        wfProfileIn( __METHOD__ );
        # We don't want to include fragments for broken links, because they
        # generally make no sense.
        if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
            $target = clone $target;
            $target->setFragment( '' );
        }

        # If it's a broken link, add the appropriate query pieces, unless
        # there's already an action specified, or unless 'edit' makes no sense
        # (i.e., for a nonexistent special page).
        if ( in_array( 'broken', $options ) && empty( $query['action'] )
            && !$target->isSpecialPage() ) {
            $query['action'] = 'edit';
            $query['redlink'] = '1';
        }

        if ( in_array( 'http', $options ) ) {
            $proto = PROTO_HTTP;
        } elseif ( in_array( 'https', $options ) ) {
            $proto = PROTO_HTTPS;
        } else {
            $proto = PROTO_RELATIVE;
        }

        $ret = $target->getLinkURL( $query, false, $proto );
        wfProfileOut( __METHOD__ );
        return $ret;
    }

    private static function linkAttribs( $target, $attribs, $options ) {
        wfProfileIn( __METHOD__ );
        global $wgUser;
        $defaults = array();

        if ( !in_array( 'noclasses', $options ) ) {
            wfProfileIn( __METHOD__ . '-getClasses' );
            # Now build the classes.
            $classes = array();

            if ( in_array( 'broken', $options ) ) {
                $classes[] = 'new';
            }

            if ( $target->isExternal() ) {
                $classes[] = 'extiw';
            }

            if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
                $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
                if ( $colour !== '' ) {
                    $classes[] = $colour; # mw-redirect or stub
                }
            }
            if ( $classes != array() ) {
                $defaults['class'] = implode( ' ', $classes );
            }
            wfProfileOut( __METHOD__ . '-getClasses' );
        }

        # Get a default title attribute.
        if ( $target->getPrefixedText() == '' ) {
            # A link like [[#Foo]].  This used to mean an empty title
            # attribute, but that's silly.  Just don't output a title.
        } elseif ( in_array( 'known', $options ) ) {
            $defaults['title'] = $target->getPrefixedText();
        } else {
            $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
        }

        # Finally, merge the custom attribs with the default ones, and iterate
        # over that, deleting all "false" attributes.
        $ret = array();
        $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
        foreach ( $merged as $key => $val ) {
            # A false value suppresses the attribute, and we don't want the
            # href attribute to be overridden.
            if ( $key != 'href' and $val !== false ) {
                $ret[$key] = $val;
            }
        }
        wfProfileOut( __METHOD__ );
        return $ret;
    }

    private static function linkText( $target ) {
        if ( !$target instanceof Title ) {
            wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
            return '';
        }
        // If the target is just a fragment, with no title, we return the fragment
        // text.  Otherwise, we return the title text itself.
        if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
            return htmlspecialchars( $target->getFragment() );
        }

        return htmlspecialchars( $target->getPrefixedText() );
    }

    public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
        $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
        if ( !wfRunHooks( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
            return $ret;
        }

        if ( $html == '' ) {
            $html = htmlspecialchars( $nt->getPrefixedText() );
        }
        list( $inside, $trail ) = self::splitTrail( $trail );
        return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
    }

    public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
        global $wgContLang;

        // First we check whether the namespace exists or not.
        if ( MWNamespace::exists( $namespace ) ) {
            if ( $namespace == NS_MAIN ) {
                $name = $context->msg( 'blanknamespace' )->text();
            } else {
                $name = $wgContLang->getFormattedNsText( $namespace );
            }
            return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
        } else {
            return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
        }
    }

    static function normaliseSpecialPage( Title $title ) {
        if ( $title->isSpecialPage() ) {
            list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
            if ( !$name ) {
                return $title;
            }
            $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
            return $ret;
        } else {
            return $title;
        }
    }

    private static function fnamePart( $url ) {
        $basename = strrchr( $url, '/' );
        if ( false === $basename ) {
            $basename = $url;
        } else {
            $basename = substr( $basename, 1 );
        }
        return $basename;
    }

    public static function makeExternalImage( $url, $alt = '' ) {
        if ( $alt == '' ) {
            $alt = self::fnamePart( $url );
        }
        $img = '';
        $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
        if ( !$success ) {
            wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
                . "with url {$url} and alt text {$alt} to {$img}\n", true );
            return $img;
        }
        return Html::element( 'img',
            array(
                'src' => $url,
                'alt' => $alt ) );
    }

    public static function makeImageLink( Parser $parser, Title $title,
        $file, $frameParams = array(), $handlerParams = array(), $time = false,
        $query = "", $widthOption = null
    ) {
        $res = null;
        $dummy = new DummyLinker;
        if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
            &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
            return $res;
        }

        if ( $file && !$file->allowInlineDisplay() ) {
            wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
            return self::link( $title );
        }

        // Shortcuts
        $fp =& $frameParams;
        $hp =& $handlerParams;

        // Clean up parameters
        $page = isset( $hp['page'] ) ? $hp['page'] : false;
        if ( !isset( $fp['align'] ) ) {
            $fp['align'] = '';
        }
        if ( !isset( $fp['alt'] ) ) {
            $fp['alt'] = '';
        }
        if ( !isset( $fp['title'] ) ) {
            $fp['title'] = '';
        }
        if ( !isset( $fp['class'] ) ) {
            $fp['class'] = '';
        }

        $prefix = $postfix = '';

        if ( 'center' == $fp['align'] ) {
            $prefix = '<div class="center">';
            $postfix = '</div>';
            $fp['align'] = 'none';
        }
        if ( $file && !isset( $hp['width'] ) ) {
            if ( isset( $hp['height'] ) && $file->isVectorized() ) {
                // If its a vector image, and user only specifies height
                // we don't want it to be limited by its "normal" width.
                global $wgSVGMaxSize;
                $hp['width'] = $wgSVGMaxSize;
            } else {
                $hp['width'] = $file->getWidth( $page );
            }

            if ( isset( $fp['thumbnail'] )
                || isset( $fp['manualthumb'] )
                || isset( $fp['framed'] )
                || isset( $fp['frameless'] )
                || !$hp['width']
            ) {
                global $wgThumbLimits, $wgThumbUpright;

                if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
                    $widthOption = User::getDefaultOption( 'thumbsize' );
                }

                // Reduce width for upright images when parameter 'upright' is used
                if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
                    $fp['upright'] = $wgThumbUpright;
                }

                // For caching health: If width scaled down due to upright
                // parameter, round to full __0 pixel to avoid the creation of a
                // lot of odd thumbs.
                $prefWidth = isset( $fp['upright'] ) ?
                    round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
                    $wgThumbLimits[$widthOption];

                // Use width which is smaller: real image width or user preference width
                // Unless image is scalable vector.
                if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
                        $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
                    $hp['width'] = $prefWidth;
                }
            }
        }

        if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
            # Create a thumbnail. Alignment depends on the writing direction of
            # the page content language (right-aligned for LTR languages,
            # left-aligned for RTL languages)
            #
            # If a thumbnail width has not been provided, it is set
            # to the default user option as specified in Language*.php
            if ( $fp['align'] == '' ) {
                $fp['align'] = $parser->getTargetLanguage()->alignEnd();
            }
            return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
        }

        if ( $file && isset( $fp['frameless'] ) ) {
            $srcWidth = $file->getWidth( $page );
            # For "frameless" option: do not present an image bigger than the
            # source (for bitmap-style images). This is the same behavior as the
            # "thumb" option does it already.
            if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
                $hp['width'] = $srcWidth;
            }
        }

        if ( $file && isset( $hp['width'] ) ) {
            # Create a resized image, without the additional thumbnail features
            $thumb = $file->transform( $hp );
        } else {
            $thumb = false;
        }

        if ( !$thumb ) {
            $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
        } else {
            self::processResponsiveImages( $file, $thumb, $hp );
            $params = array(
                'alt' => $fp['alt'],
                'title' => $fp['title'],
                'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
                'img-class' => $fp['class'] );
            if ( isset( $fp['border'] ) ) {
                $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
            }
            $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;

            $s = $thumb->toHtml( $params );
        }
        if ( $fp['align'] != '' ) {
            $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
        }
        return str_replace( "\n", ' ', $prefix . $s . $postfix );
    }

    public static function makeImageLink2( Title $title, $file, $frameParams = array(),
        $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
        return self::makeImageLink( null, $title, $file, $frameParams,
            $handlerParams, $time, $query, $widthOption );
    }

    private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
        $mtoParams = array();
        if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
            $mtoParams['custom-url-link'] = $frameParams['link-url'];
            if ( isset( $frameParams['link-target'] ) ) {
                $mtoParams['custom-target-link'] = $frameParams['link-target'];
            }
            if ( $parser ) {
                $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
                foreach ( $extLinkAttrs as $name => $val ) {
                    // Currently could include 'rel' and 'target'
                    $mtoParams['parser-extlink-' . $name] = $val;
                }
            }
        } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
            $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
        } elseif ( !empty( $frameParams['no-link'] ) ) {
            // No link
        } else {
            $mtoParams['desc-link'] = true;
            $mtoParams['desc-query'] = $query;
        }
        return $mtoParams;
    }

    public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
        $align = 'right', $params = array(), $framed = false, $manualthumb = ""
    ) {
        $frameParams = array(
            'alt' => $alt,
            'caption' => $label,
            'align' => $align
        );
        if ( $framed ) {
            $frameParams['framed'] = true;
        }
        if ( $manualthumb ) {
            $frameParams['manualthumb'] = $manualthumb;
        }
        return self::makeThumbLink2( $title, $file, $frameParams, $params );
    }

    public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
        $handlerParams = array(), $time = false, $query = ""
    ) {
        $exists = $file && $file->exists();

        # Shortcuts
        $fp =& $frameParams;
        $hp =& $handlerParams;

        $page = isset( $hp['page'] ) ? $hp['page'] : false;
        if ( !isset( $fp['align'] ) ) {
            $fp['align'] = 'right';
        }
        if ( !isset( $fp['alt'] ) ) {
            $fp['alt'] = '';
        }
        if ( !isset( $fp['title'] ) ) {
            $fp['title'] = '';
        }
        if ( !isset( $fp['caption'] ) ) {
            $fp['caption'] = '';
        }

        if ( empty( $hp['width'] ) ) {
            // Reduce width for upright images when parameter 'upright' is used
            $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
        }
        $thumb = false;
        $noscale = false;
        $manualthumb = false;

        if ( !$exists ) {
            $outerWidth = $hp['width'] + 2;
        } else {
            if ( isset( $fp['manualthumb'] ) ) {
                # Use manually specified thumbnail
                $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
                if ( $manual_title ) {
                    $manual_img = wfFindFile( $manual_title );
                    if ( $manual_img ) {
                        $thumb = $manual_img->getUnscaledThumb( $hp );
                        $manualthumb = true;
                    } else {
                        $exists = false;
                    }
                }
            } elseif ( isset( $fp['framed'] ) ) {
                // Use image dimensions, don't scale
                $thumb = $file->getUnscaledThumb( $hp );
                $noscale = true;
            } else {
                # Do not present an image bigger than the source, for bitmap-style images
                # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
                $srcWidth = $file->getWidth( $page );
                if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
                    $hp['width'] = $srcWidth;
                }
                $thumb = $file->transform( $hp );
            }

            if ( $thumb ) {
                $outerWidth = $thumb->getWidth() + 2;
            } else {
                $outerWidth = $hp['width'] + 2;
            }
        }

        # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
        # So we don't need to pass it here in $query. However, the URL for the
        # zoom icon still needs it, so we make a unique query for it. See bug 14771
        $url = $title->getLocalURL( $query );
        if ( $page ) {
            $url = wfAppendQuery( $url, array( 'page' => $page ) );
        }
        if ( $manualthumb
            && !isset( $fp['link-title'] )
            && !isset( $fp['link-url'] )
            && !isset( $fp['no-link'] ) ) {
            $fp['link-url'] = $url;
        }

        $s = "<div class=\"thumb t{$fp['align']}\">"
            . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";

        if ( !$exists ) {
            $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
            $zoomIcon = '';
        } elseif ( !$thumb ) {
            $s .= wfMessage( 'thumbnail_error', '' )->escaped();
            $zoomIcon = '';
        } else {
            if ( !$noscale && !$manualthumb ) {
                self::processResponsiveImages( $file, $thumb, $hp );
            }
            $params = array(
                'alt' => $fp['alt'],
                'title' => $fp['title'],
                'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
                    ? $fp['class'] . ' '
                    : '' ) . 'thumbimage'
            );
            $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
            $s .= $thumb->toHtml( $params );
            if ( isset( $fp['framed'] ) ) {
                $zoomIcon = "";
            } else {
                $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
                    Html::rawElement( 'a', array(
                        'href' => $url,
                        'class' => 'internal',
                        'title' => wfMessage( 'thumbnail-more' )->text() ),
                        "" ) );
            }
        }
        $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
        return str_replace( "\n", ' ', $s );
    }

    public static function processResponsiveImages( $file, $thumb, $hp ) {
        global $wgResponsiveImages;
        if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
            $hp15 = $hp;
            $hp15['width'] = round( $hp['width'] * 1.5 );
            $hp20 = $hp;
            $hp20['width'] = $hp['width'] * 2;
            if ( isset( $hp['height'] ) ) {
                $hp15['height'] = round( $hp['height'] * 1.5 );
                $hp20['height'] = $hp['height'] * 2;
            }

            $thumb15 = $file->transform( $hp15 );
            $thumb20 = $file->transform( $hp20 );
            if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
                $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
            }
            if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
                $thumb->responsiveUrls['2'] = $thumb20->getUrl();
            }
        }
    }

    public static function makeBrokenImageLinkObj( $title, $label = '',
        $query = '', $unused1 = '', $unused2 = '', $time = false
    ) {
        if ( !$title instanceof Title ) {
            wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
            return "<!-- ERROR -->" . htmlspecialchars( $label );
        }

        global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
        wfProfileIn( __METHOD__ );
        if ( $label == '' ) {
            $label = $title->getPrefixedText();
        }
        $encLabel = htmlspecialchars( $label );
        $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;

        if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
            && !$currentExists
        ) {
            $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );

            if ( $redir ) {
                wfProfileOut( __METHOD__ );
                return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
            }

            $href = self::getUploadUrl( $title, $query );

            wfProfileOut( __METHOD__ );
            return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
                htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
                $encLabel . '</a>';
        }

        wfProfileOut( __METHOD__ );
        return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
    }

    protected static function getUploadUrl( $destFile, $query = '' ) {
        global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
        $q = 'wpDestFile=' . $destFile->getPartialURL();
        if ( $query != '' ) {
            $q .= '&' . $query;
        }

        if ( $wgUploadMissingFileUrl ) {
            return wfAppendQuery( $wgUploadMissingFileUrl, $q );
        } elseif ( $wgUploadNavigationUrl ) {
            return wfAppendQuery( $wgUploadNavigationUrl, $q );
        } else {
            $upload = SpecialPage::getTitleFor( 'Upload' );
            return $upload->getLocalURL( $q );
        }
    }

    public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
        $img = wfFindFile( $title, array( 'time' => $time ) );
        return self::makeMediaLinkFile( $title, $img, $html );
    }

    public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
        if ( $file && $file->exists() ) {
            $url = $file->getURL();
            $class = 'internal';
        } else {
            $url = self::getUploadUrl( $title );
            $class = 'new';
        }

        $alt = $title->getText();
        if ( $html == '' ) {
            $html = $alt;
        }

        $ret = '';
        $attribs = array(
            'href' => $url,
            'class' => $class,
            'title' => $alt
        );

        if ( !wfRunHooks( 'LinkerMakeMediaLinkFile',
            array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
            wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
                . "with url {$url} and text {$html} to {$ret}\n", true );
            return $ret;
        }

        return Html::rawElement( 'a', $attribs, $html );
    }

    public static function specialLink( $name, $key = '' ) {
        if ( $key == '' ) {
            $key = strtolower( $name );
        }

        return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
    }

    public static function makeExternalLink( $url, $text, $escape = true,
        $linktype = '', $attribs = array(), $title = null
    ) {
        global $wgTitle;
        $class = "external";
        if ( $linktype ) {
            $class .= " $linktype";
        }
        if ( isset( $attribs['class'] ) && $attribs['class'] ) {
            $class .= " {$attribs['class']}";
        }
        $attribs['class'] = $class;

        if ( $escape ) {
            $text = htmlspecialchars( $text );
        }

        if ( !$title ) {
            $title = $wgTitle;
        }
        $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
        $link = '';
        $success = wfRunHooks( 'LinkerMakeExternalLink',
            array( &$url, &$text, &$link, &$attribs, $linktype ) );
        if ( !$success ) {
            wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
                . "with url {$url} and text {$text} to {$link}\n", true );
            return $link;
        }
        $attribs['href'] = $url;
        return Html::rawElement( 'a', $attribs, $text );
    }

    public static function userLink( $userId, $userName, $altUserName = false ) {
        $classes = 'mw-userlink';
        if ( $userId == 0 ) {
            $page = SpecialPage::getTitleFor( 'Contributions', $userName );
            if ( $altUserName === false ) {
                $altUserName = IP::prettifyIP( $userName );
            }
            $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
        } else {
            $page = Title::makeTitle( NS_USER, $userName );
        }

        return self::link(
            $page,
            htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
            array( 'class' => $classes )
        );
    }

    public static function userToolLinks(
        $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
    ) {
        global $wgUser, $wgDisableAnonTalk, $wgLang;
        $talkable = !( $wgDisableAnonTalk && 0 == $userId );
        $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
        $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;

        $items = array();
        if ( $talkable ) {
            $items[] = self::userTalkLink( $userId, $userText );
        }
        if ( $userId ) {
            // check if the user has an edit
            $attribs = array();
            if ( $redContribsWhenNoEdits ) {
                if ( intval( $edits ) === 0 && $edits !== 0 ) {
                    $user = User::newFromId( $userId );
                    $edits = $user->getEditCount();
                }
                if ( $edits === 0 ) {
                    $attribs['class'] = 'new';
                }
            }
            $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );

            $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
        }
        if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
            $items[] = self::blockLink( $userId, $userText );
        }

        if ( $addEmailLink && $wgUser->canSendEmail() ) {
            $items[] = self::emailLink( $userId, $userText );
        }

        wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );

        if ( $items ) {
            return wfMessage( 'word-separator' )->plain()
                . '<span class="mw-usertoollinks">'
                . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
                . '</span>';
        } else {
            return '';
        }
    }

    public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
        return self::userToolLinks( $userId, $userText, true, 0, $edits );
    }

    public static function userTalkLink( $userId, $userText ) {
        $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
        $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
        return $userTalkLink;
    }

    public static function blockLink( $userId, $userText ) {
        $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
        $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
        return $blockLink;
    }

    public static function emailLink( $userId, $userText ) {
        $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
        $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
        return $emailLink;
    }

    public static function revUserLink( $rev, $isPublic = false ) {
        if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
            $link = wfMessage( 'rev-deleted-user' )->escaped();
        } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
            $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
                $rev->getUserText( Revision::FOR_THIS_USER ) );
        } else {
            $link = wfMessage( 'rev-deleted-user' )->escaped();
        }
        if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
            return '<span class="history-deleted">' . $link . '</span>';
        }
        return $link;
    }

    public static function revUserTools( $rev, $isPublic = false ) {
        if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
            $link = wfMessage( 'rev-deleted-user' )->escaped();
        } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
            $userId = $rev->getUser( Revision::FOR_THIS_USER );
            $userText = $rev->getUserText( Revision::FOR_THIS_USER );
            $link = self::userLink( $userId, $userText )
                . wfMessage( 'word-separator' )->plain()
                . self::userToolLinks( $userId, $userText );
        } else {
            $link = wfMessage( 'rev-deleted-user' )->escaped();
        }
        if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
            return ' <span class="history-deleted">' . $link . '</span>';
        }
        return $link;
    }

    public static function formatComment( $comment, $title = null, $local = false ) {
        wfProfileIn( __METHOD__ );

        # Sanitize text a bit:
        $comment = str_replace( "\n", " ", $comment );
        # Allow HTML entities (for bug 13815)
        $comment = Sanitizer::escapeHtmlAllowEntities( $comment );

        # Render autocomments and make links:
        $comment = self::formatAutocomments( $comment, $title, $local );
        $comment = self::formatLinksInComment( $comment, $title, $local );

        wfProfileOut( __METHOD__ );
        return $comment;
    }

    private static function formatAutocomments( $comment, $title = null, $local = false ) {
        return preg_replace_callback(
            '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
            function ( $match ) use ( $title, $local ) {
                global $wgLang;

                $pre = $match[1];
                $auto = $match[2];
                $post = $match[3];
                $comment = null;
                wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
                if ( $comment === null ) {
                    $link = '';
                    if ( $title ) {
                        $section = $auto;
                        # Remove links that a user may have manually put in the autosummary
                        # This could be improved by copying as much of Parser::stripSectionName as desired.
                        $section = str_replace( '[[:', '', $section );
                        $section = str_replace( '[[', '', $section );
                        $section = str_replace( ']]', '', $section );

                        $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
                        if ( $local ) {
                            $sectionTitle = Title::newFromText( '#' . $section );
                        } else {
                            $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
                                $title->getDBkey(), $section );
                        }
                        if ( $sectionTitle ) {
                            $link = Linker::link( $sectionTitle,
                                $wgLang->getArrow(), array(), array(),
                                'noclasses' );
                        } else {
                            $link = '';
                        }
                    }
                    if ( $pre ) {
                        # written summary $presep autocomment (summary /* section */)
                        $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
                    }
                    if ( $post ) {
                        # autocomment $postsep written summary (/* section */ summary)
                        $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
                    }
                    $auto = '<span class="autocomment">' . $auto . '</span>';
                    $comment = $pre . $link . $wgLang->getDirMark()
                        . '<span dir="auto">' . $auto . $post . '</span>';
                }
                return $comment;
            },
            $comment
        );
    }

    public static function formatLinksInComment( $comment, $title = null, $local = false ) {
        return preg_replace_callback(
            '/
                \[\[
                :? # ignore optional leading colon
                ([^\]|]+) # 1. link target; page names cannot include ] or |
                (?:\|
                    # 2. a pipe-separated substring; only the last is captured
                    # Stop matching at | and ]] without relying on backtracking.
                    ((?:]?[^\]|])*+)
                )*
                \]\]
                ([^[]*) # 3. link trail (the text up until the next link)
            /x',
            function ( $match ) use ( $title, $local ) {
                global $wgContLang;

                $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
                $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';

                $comment = $match[0];

                # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
                if ( strpos( $match[1], '%' ) !== false ) {
                    $match[1] = str_replace(
                        array( '<', '>' ),
                        array( '&lt;', '&gt;' ),
                        rawurldecode( $match[1] )
                    );
                }

                # Handle link renaming [[foo|text]] will show link as "text"
                if ( $match[2] != "" ) {
                    $text = $match[2];
                } else {
                    $text = $match[1];
                }
                $submatch = array();
                $thelink = null;
                if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
                    # Media link; trail not supported.
                    $linkRegexp = '/\[\[(.*?)\]\]/';
                    $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
                    if ( $title ) {
                        $thelink = Linker::makeMediaLinkObj( $title, $text );
                    }
                } else {
                    # Other kind of link
                    if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
                        $trail = $submatch[1];
                    } else {
                        $trail = "";
                    }
                    $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
                    if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
                        $match[1] = substr( $match[1], 1 );
                    }
                    list( $inside, $trail ) = Linker::splitTrail( $trail );

                    $linkText = $text;
                    $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );

                    $target = Title::newFromText( $linkTarget );
                    if ( $target ) {
                        if ( $target->getText() == '' && !$target->isExternal()
                            && !$local && $title
                        ) {
                            $newTarget = clone ( $title );
                            $newTarget->setFragment( '#' . $target->getFragment() );
                            $target = $newTarget;
                        }
                        $thelink = Linker::link(
                            $target,
                            $linkText . $inside
                        ) . $trail;
                    }
                }
                if ( $thelink ) {
                    // If the link is still valid, go ahead and replace it in!
                    $comment = preg_replace(
                        $linkRegexp,
                        StringUtils::escapeRegexReplacement( $thelink ),
                        $comment,
                        1
                    );
                }

                return $comment;
            },
            $comment
        );
    }

    public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
        # Valid link forms:
        # Foobar -- normal
        # :Foobar -- override special treatment of prefix (images, language links)
        # /Foobar -- convert to CurrentPage/Foobar
        # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
        # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
        # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage

        wfProfileIn( __METHOD__ );
        $ret = $target; # default return value is no change

        # Some namespaces don't allow subpages,
        # so only perform processing if subpages are allowed
        if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
            $hash = strpos( $target, '#' );
            if ( $hash !== false ) {
                $suffix = substr( $target, $hash );
                $target = substr( $target, 0, $hash );
            } else {
                $suffix = '';
            }
            # bug 7425
            $target = trim( $target );
            # Look at the first character
            if ( $target != '' && $target[0] === '/' ) {
                # / at end means we don't want the slash to be shown
                $m = array();
                $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
                if ( $trailingSlashes ) {
                    $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
                } else {
                    $noslash = substr( $target, 1 );
                }

                $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
                if ( $text === '' ) {
                    $text = $target . $suffix;
                } # this might be changed for ugliness reasons
            } else {
                # check for .. subpage backlinks
                $dotdotcount = 0;
                $nodotdot = $target;
                while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
                    ++$dotdotcount;
                    $nodotdot = substr( $nodotdot, 3 );
                }
                if ( $dotdotcount > 0 ) {
                    $exploded = explode( '/', $contextTitle->getPrefixedText() );
                    if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
                        $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
                        # / at the end means don't show full path
                        if ( substr( $nodotdot, -1, 1 ) === '/' ) {
                            $nodotdot = substr( $nodotdot, 0, -1 );
                            if ( $text === '' ) {
                                $text = $nodotdot . $suffix;
                            }
                        }
                        $nodotdot = trim( $nodotdot );
                        if ( $nodotdot != '' ) {
                            $ret .= '/' . $nodotdot;
                        }
                        $ret .= $suffix;
                    }
                }
            }
        }

        wfProfileOut( __METHOD__ );
        return $ret;
    }

    public static function commentBlock( $comment, $title = null, $local = false ) {
        // '*' used to be the comment inserted by the software way back
        // in antiquity in case none was provided, here for backwards
        // compatibility, acc. to brion -ævar
        if ( $comment == '' || $comment == '*' ) {
            return '';
        } else {
            $formatted = self::formatComment( $comment, $title, $local );
            $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
            return " <span class=\"comment\">$formatted</span>";
        }
    }

    public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
        if ( $rev->getRawComment() == "" ) {
            return "";
        }
        if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
            $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
        } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
            $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
                $rev->getTitle(), $local );
        } else {
            $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
        }
        if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
            return " <span class=\"history-deleted\">$block</span>";
        }
        return $block;
    }

    public static function formatRevisionSize( $size ) {
        if ( $size == 0 ) {
            $stxt = wfMessage( 'historyempty' )->escaped();
        } else {
            $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
            $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
        }
        return "<span class=\"history-size\">$stxt</span>";
    }

    public static function tocIndent() {
        return "\n<ul>";
    }

    public static function tocUnindent( $level ) {
        return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
    }

    public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
        $classes = "toclevel-$level";
        if ( $sectionIndex !== false ) {
            $classes .= " tocsection-$sectionIndex";
        }
        return "\n<li class=\"$classes\"><a href=\"#" .
            $anchor . '"><span class="tocnumber">' .
            $tocnumber . '</span> <span class="toctext">' .
            $tocline . '</span></a>';
    }

    public static function tocLineEnd() {
        return "</li>\n";
    }

    public static function tocList( $toc, $lang = false ) {
        $lang = wfGetLangObj( $lang );
        $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();

        return '<div id="toc" class="toc">'
            . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
            . $toc
            . "</ul>\n</div>\n";
    }

    public static function generateTOC( $tree ) {
        $toc = '';
        $lastLevel = 0;
        foreach ( $tree as $section ) {
            if ( $section['toclevel'] > $lastLevel ) {
                $toc .= self::tocIndent();
            } elseif ( $section['toclevel'] < $lastLevel ) {
                $toc .= self::tocUnindent(
                    $lastLevel - $section['toclevel'] );
            } else {
                $toc .= self::tocLineEnd();
            }

            $toc .= self::tocLine( $section['anchor'],
                $section['line'], $section['number'],
                $section['toclevel'], $section['index'] );
            $lastLevel = $section['toclevel'];
        }
        $toc .= self::tocLineEnd();
        return self::tocList( $toc );
    }

    public static function makeHeadline( $level, $attribs, $anchor, $html,
        $link, $legacyAnchor = false
    ) {
        $ret = "<h$level$attribs"
            . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
            . $link
            . "</h$level>";
        if ( $legacyAnchor !== false ) {
            $ret = "<div id=\"$legacyAnchor\"></div>$ret";
        }
        return $ret;
    }

    static function splitTrail( $trail ) {
        global $wgContLang;
        $regex = $wgContLang->linkTrail();
        $inside = '';
        if ( $trail !== '' ) {
            $m = array();
            if ( preg_match( $regex, $trail, $m ) ) {
                $inside = $m[1];
                $trail = $m[2];
            }
        }
        return array( $inside, $trail );
    }

    public static function generateRollback( $rev, IContextSource $context = null,
        $options = array( 'verify' )
    ) {
        if ( $context === null ) {
            $context = RequestContext::getMain();
        }

        $editCount = false;
        if ( in_array( 'verify', $options ) ) {
            $editCount = self::getRollbackEditCount( $rev, true );
            if ( $editCount === false ) {
                return '';
            }
        }

        $inner = self::buildRollbackLink( $rev, $context, $editCount );

        if ( !in_array( 'noBrackets', $options ) ) {
            $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
        }

        return '<span class="mw-rollback-link">' . $inner . '</span>';
    }

    public static function getRollbackEditCount( $rev, $verify ) {
        global $wgShowRollbackEditCount;
        if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
            // Nothing has happened, indicate this by returning 'null'
            return null;
        }

        $dbr = wfGetDB( DB_SLAVE );

        // Up to the value of $wgShowRollbackEditCount revisions are counted
        $res = $dbr->select(
            'revision',
            array( 'rev_user_text', 'rev_deleted' ),
            // $rev->getPage() returns null sometimes
            array( 'rev_page' => $rev->getTitle()->getArticleID() ),
            __METHOD__,
            array(
                'USE INDEX' => array( 'revision' => 'page_timestamp' ),
                'ORDER BY' => 'rev_timestamp DESC',
                'LIMIT' => $wgShowRollbackEditCount + 1
            )
        );

        $editCount = 0;
        $moreRevs = false;
        foreach ( $res as $row ) {
            if ( $rev->getRawUserText() != $row->rev_user_text ) {
                if ( $verify &&
                    ( $row->rev_deleted & Revision::DELETED_TEXT
                        || $row->rev_deleted & Revision::DELETED_USER
                ) ) {
                    // If the user or the text of the revision we might rollback
                    // to is deleted in some way we can't rollback. Similar to
                    // the sanity checks in WikiPage::commitRollback.
                    return false;
                }
                $moreRevs = true;
                break;
            }
            $editCount++;
        }

        if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
            // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
            // and there weren't any other revisions. That means that the current user is the only
            // editor, so we can't rollback
            return false;
        }
        return $editCount;
    }

    public static function buildRollbackLink( $rev, IContextSource $context = null,
        $editCount = false
    ) {
        global $wgShowRollbackEditCount, $wgMiserMode;

        // To config which pages are effected by miser mode
        $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );

        if ( $context === null ) {
            $context = RequestContext::getMain();
        }

        $title = $rev->getTitle();
        $query = array(
            'action' => 'rollback',
            'from' => $rev->getUserText(),
            'token' => $context->getUser()->getEditToken( array(
                $title->getPrefixedText(),
                $rev->getUserText()
            ) ),
        );
        if ( $context->getRequest()->getBool( 'bot' ) ) {
            $query['bot'] = '1';
            $query['hidediff'] = '1'; // bug 15999
        }

        $disableRollbackEditCount = false;
        if ( $wgMiserMode ) {
            foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
                if ( $context->getTitle()->isSpecial( $specialPage ) ) {
                    $disableRollbackEditCount = true;
                    break;
                }
            }
        }

        if ( !$disableRollbackEditCount
            && is_int( $wgShowRollbackEditCount )
            && $wgShowRollbackEditCount > 0
        ) {
            if ( !is_numeric( $editCount ) ) {
                $editCount = self::getRollbackEditCount( $rev, false );
            }

            if ( $editCount > $wgShowRollbackEditCount ) {
                $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
                    ->numParams( $wgShowRollbackEditCount )->parse();
            } else {
                $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
            }

            return self::link(
                $title,
                $editCount_output,
                array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
                $query,
                array( 'known', 'noclasses' )
            );
        } else {
            return self::link(
                $title,
                $context->msg( 'rollbacklink' )->escaped(),
                array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
                $query,
                array( 'known', 'noclasses' )
            );
        }
    }

    public static function formatTemplates( $templates, $preview = false,
        $section = false, $more = null
    ) {
        global $wgLang;
        wfProfileIn( __METHOD__ );

        $outText = '';
        if ( count( $templates ) > 0 ) {
            # Do a batch existence check
            $batch = new LinkBatch;
            foreach ( $templates as $title ) {
                $batch->addObj( $title );
            }
            $batch->execute();

            # Construct the HTML
            $outText = '<div class="mw-templatesUsedExplanation">';
            if ( $preview ) {
                $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
                    ->parseAsBlock();
            } elseif ( $section ) {
                $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
                    ->parseAsBlock();
            } else {
                $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
                    ->parseAsBlock();
            }
            $outText .= "</div><ul>\n";

            usort( $templates, 'Title::compare' );
            foreach ( $templates as $titleObj ) {
                $protected = '';
                $restrictions = $titleObj->getRestrictions( 'edit' );
                if ( $restrictions ) {
                    // Check backwards-compatible messages
                    $msg = null;
                    if ( $restrictions === array( 'sysop' ) ) {
                        $msg = wfMessage( 'template-protected' );
                    } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
                        $msg = wfMessage( 'template-semiprotected' );
                    }
                    if ( $msg && !$msg->isDisabled() ) {
                        $protected = $msg->parse();
                    } else {
                        // Construct the message from restriction-level-*
                        // e.g. restriction-level-sysop, restriction-level-autoconfirmed
                        $msgs = array();
                        foreach ( $restrictions as $r ) {
                            $msgs[] = wfMessage( "restriction-level-$r" )->parse();
                        }
                        $protected = wfMessage( 'parentheses' )
                            ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
                    }
                }
                if ( $titleObj->quickUserCan( 'edit' ) ) {
                    $editLink = self::link(
                        $titleObj,
                        wfMessage( 'editlink' )->text(),
                        array(),
                        array( 'action' => 'edit' )
                    );
                } else {
                    $editLink = self::link(
                        $titleObj,
                        wfMessage( 'viewsourcelink' )->text(),
                        array(),
                        array( 'action' => 'edit' )
                    );
                }
                $outText .= '<li>' . self::link( $titleObj )
                    . wfMessage( 'word-separator' )->escaped()
                    . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
                    . wfMessage( 'word-separator' )->escaped()
                    . $protected . '</li>';
            }

            if ( $more instanceof Title ) {
                $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
            } elseif ( $more ) {
                $outText .= "<li>$more</li>";
            }

            $outText .= '</ul>';
        }
        wfProfileOut( __METHOD__ );
        return $outText;
    }

    public static function formatHiddenCategories( $hiddencats ) {
        wfProfileIn( __METHOD__ );

        $outText = '';
        if ( count( $hiddencats ) > 0 ) {
            # Construct the HTML
            $outText = '<div class="mw-hiddenCategoriesExplanation">';
            $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
            $outText .= "</div><ul>\n";

            foreach ( $hiddencats as $titleObj ) {
                # If it's hidden, it must exist - no need to check with a LinkBatch
                $outText .= '<li>'
                    . self::link( $titleObj, null, array(), array(), 'known' )
                    . "</li>\n";
            }
            $outText .= '</ul>';
        }
        wfProfileOut( __METHOD__ );
        return $outText;
    }

    public static function formatSize( $size ) {
        global $wgLang;
        return htmlspecialchars( $wgLang->formatSize( $size ) );
    }

    public static function titleAttrib( $name, $options = null ) {
        wfProfileIn( __METHOD__ );

        $message = wfMessage( "tooltip-$name" );

        if ( !$message->exists() ) {
            $tooltip = false;
        } else {
            $tooltip = $message->text();
            # Compatibility: formerly some tooltips had [alt-.] hardcoded
            $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
            # Message equal to '-' means suppress it.
            if ( $tooltip == '-' ) {
                $tooltip = false;
            }
        }

        if ( $options == 'withaccess' ) {
            $accesskey = self::accesskey( $name );
            if ( $accesskey !== false ) {
                // Should be build the same as in jquery.accessKeyLabel.js
                if ( $tooltip === false || $tooltip === '' ) {
                    $tooltip = wfMessage( 'brackets', $accesskey )->text();
                } else {
                    $tooltip .= wfMessage( 'word-separator' )->text();
                    $tooltip .= wfMessage( 'brackets', $accesskey )->text();
                }
            }
        }

        wfProfileOut( __METHOD__ );
        return $tooltip;
    }

    public static $accesskeycache;

    public static function accesskey( $name ) {
        if ( isset( self::$accesskeycache[$name] ) ) {
            return self::$accesskeycache[$name];
        }
        wfProfileIn( __METHOD__ );

        $message = wfMessage( "accesskey-$name" );

        if ( !$message->exists() ) {
            $accesskey = false;
        } else {
            $accesskey = $message->plain();
            if ( $accesskey === '' || $accesskey === '-' ) {
                # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
                # attribute, but this is broken for accesskey: that might be a useful
                # value.
                $accesskey = false;
            }
        }

        wfProfileOut( __METHOD__ );
        self::$accesskeycache[$name] = $accesskey;
        return self::$accesskeycache[$name];
    }

    public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
        $canHide = $user->isAllowed( 'deleterevision' );
        if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
            return '';
        }

        if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
            return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
        } else {
            if ( $rev->getId() ) {
                // RevDelete links using revision ID are stable across
                // page deletion and undeletion; use when possible.
                $query = array(
                    'type' => 'revision',
                    'target' => $title->getPrefixedDBkey(),
                    'ids' => $rev->getId()
                );
            } else {
                // Older deleted entries didn't save a revision ID.
                // We have to refer to these by timestamp, ick!
                $query = array(
                    'type' => 'archive',
                    'target' => $title->getPrefixedDBkey(),
                    'ids' => $rev->getTimestamp()
                );
            }
            return Linker::revDeleteLink( $query,
                $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
        }
    }

    public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
        $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
        $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
        $html = wfMessage( $msgKey )->escaped();
        $tag = $restricted ? 'strong' : 'span';
        $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
        return Xml::tags(
            $tag,
            array( 'class' => 'mw-revdelundel-link' ),
            wfMessage( 'parentheses' )->rawParams( $link )->escaped()
        );
    }

    public static function revDeleteLinkDisabled( $delete = true ) {
        $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
        $html = wfMessage( $msgKey )->escaped();
        $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
        return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
    }

    /* Deprecated methods */

    static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
        wfDeprecated( __METHOD__, '1.21' );

        wfProfileIn( __METHOD__ );
        $query = wfCgiToArray( $query );
        list( $inside, $trail ) = self::splitTrail( $trail );
        if ( $text === '' ) {
            $text = self::linkText( $nt );
        }

        $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;

        wfProfileOut( __METHOD__ );
        return $ret;
    }

    static function makeKnownLinkObj(
        $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
    ) {
        wfDeprecated( __METHOD__, '1.21' );

        wfProfileIn( __METHOD__ );

        if ( $text == '' ) {
            $text = self::linkText( $title );
        }
        $attribs = Sanitizer::mergeAttributes(
            Sanitizer::decodeTagAttributes( $aprops ),
            Sanitizer::decodeTagAttributes( $style )
        );
        $query = wfCgiToArray( $query );
        list( $inside, $trail ) = self::splitTrail( $trail );

        $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
            array( 'known', 'noclasses' ) ) . $trail;

        wfProfileOut( __METHOD__ );
        return $ret;
    }

    public static function tooltipAndAccesskeyAttribs( $name ) {
        # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
        # no attribute" instead of "output '' as value for attribute", this
        # would be three lines.
        $attribs = array(
            'title' => self::titleAttrib( $name, 'withaccess' ),
            'accesskey' => self::accesskey( $name )
        );
        if ( $attribs['title'] === false ) {
            unset( $attribs['title'] );
        }
        if ( $attribs['accesskey'] === false ) {
            unset( $attribs['accesskey'] );
        }
        return $attribs;
    }

    public static function tooltip( $name, $options = null ) {
        # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
        # no attribute" instead of "output '' as value for attribute", this
        # would be two lines.
        $tooltip = self::titleAttrib( $name, $options );
        if ( $tooltip === false ) {
            return '';
        }
        return Xml::expandAttributes( array(
            'title' => $tooltip
        ) );
    }
}

class DummyLinker {

    public function __call( $fname, $args ) {
        return call_user_func_array( array( 'Linker', $fname ), $args );
    }
}