* Image:Foo.jpg | 100px | picture of a foo * * rect 0 0 50 50 [[Foo type A]] * circle 50 50 20 [[Foo type B]] * * desc bottom-left * * * Coordinates are relative to the source image, not the thumbnail * */ require_once( dirname( __FILE__ ) . '/ImageMap.i18n.php' ); global $wgMessageCache; foreach( efImageMapMessages() as $lang => $messages ) $wgMessageCache->addMessages( $messages, $lang ); class ImageMap { static public $id = 0; const TOP_RIGHT = 0; const BOTTOM_RIGHT = 1; const BOTTOM_LEFT = 2; const TOP_LEFT = 3; const NONE = 4; static function render( $input, $params, $parser ) { global $wgScriptPath, $wgUser, $wgImageMapAllowExternalLinks, $wgUrlProtocols, $wgNoFollowLinks; $lines = explode( "\n", $input ); $first = true; $lineNum = 0; $output = ''; $links = array(); # Define canonical desc types to allow i18n of 'imagemap_desc_types' $descTypesCanonical = 'top-right, bottom-right, bottom-left, top-left, none'; $descType = self::BOTTOM_RIGHT; $defaultLinkAttribs = false; $realmap = true; foreach ( $lines as $line ) { ++$lineNum; $externLink = false; $line = trim( $line ); if ( $line == '' || $line[0] == '#' ) { continue; } if ( $first ) { $first = false; # The first line should have an image specification on it # Extract it and render the HTML $bits = explode( '|', $line, 2 ); if ( count( $bits ) == 1 ) { $image = $bits[0]; $options = ''; } else { list( $image, $options ) = $bits; } $imageTitle = Title::newFromText( $image ); if ( !$imageTitle || $imageTitle->getNamespace() != NS_IMAGE ) { return self::error( 'imagemap_no_image' ); } $imageHTML = $parser->makeImage( $imageTitle, $options ); $domDoc = DOMDocument::loadXML( $imageHTML ); $xpath = new DOMXPath( $domDoc ); $imgs = $xpath->query( '//img' ); if ( !$imgs->length ) { return self::error( 'imagemap_invalid_image' ); } $imageNode = $imgs->item(0); $thumbWidth = $imageNode->getAttribute('width'); $thumbHeight = $imageNode->getAttribute('height'); $imageObj = function_exists( 'wfFindFile' ) ? wfFindFile( $imageTitle ) : new Image( $imageTitle ); if ( !$imageObj || !$imageObj->exists() ) { return self::error( 'imagemap_invalid_image' ); } # Add the linear dimensions to avoid inaccuracy in the scale # factor when one is much larger than the other # (sx+sy)/(x+y) = s $denominator = $imageObj->getWidth() + $imageObj->getHeight(); $numerator = $thumbWidth + $thumbHeight; if ( $denominator <= 0 || $numerator <= 0 ) { return self::error( 'imagemap_invalid_image' ); } $scale = $numerator / $denominator; continue; } # Handle desc spec $cmd = strtok( $line, " \t" ); if ( $cmd == 'desc' ) { $typesText = wfMsgForContent( 'imagemap_desc_types' ); if ( $descTypesCanonical != $typesText ) { // i18n desc types exists $typesText = $descTypesCanonical . ', ' . $typesText; } $types = array_map( 'trim', explode( ',', $typesText ) ); $type = trim( strtok( '' ) ); $descType = array_search( $type, $types ); if ( $descType > 4 ) { // A localized descType is used. Subtract 5 to reach the canonical desc type. $descType = $descType - 5; } if ( $descType === false || $descType < 0 ) { // <0? In theory never, but paranoia... return self::error( 'imagemap_invalid_desc', $typesText ); } continue; } # Find the link $link = trim( strstr( $line, '[' ) ); if ( preg_match( '/^ \[\[ ([^|]*+) \| ([^\]]*+) \]\] \w* $ /x', $link, $m ) ) { $title = Title::newFromText( $m[1] ); $alt = trim( $m[2] ); } elseif ( preg_match( '/^ \[\[ ([^\]]*+) \]\] \w* $ /x', $link, $m ) ) { $title = Title::newFromText( $m[1] ); if (is_null($title)) return self::error('imagemap_invalid_title', $lineNum); $alt = $title->getFullText(); } elseif ( $wgImageMapAllowExternalLinks && ( in_array( substr( $link , 1 , strpos($link, '//' )+1 ) , $wgUrlProtocols ) || in_array( substr( $link , 1 , strpos($link, ':' ) ) , $wgUrlProtocols ) ) ) { if ( preg_match( '/^ \[ ([^\s]*+) \s ([^\]]*+) \] \w* $ /x', $link, $m ) ) { $title = htmlspecialchars( $m[1] ); $alt = htmlspecialchars( trim( $m[2] ) ); $externLink = true; } elseif ( preg_match( '/^ \[ ([^\]]*+) \] \w* $ /x', $link, $m ) ) { $title = htmlspecialchars( $m[1] ); $alt = htmlspecialchars( trim( $m[1] ) ); $externLink = true; } } else { return self::error( 'imagemap_no_link', $lineNum ); } if ( !$title ) { return self::error( 'imagemap_invalid_title', $lineNum ); } $shapeSpec = substr( $line, 0, -strlen( $link ) ); # Tokenize shape spec $shape = strtok( $shapeSpec, " \t" ); switch ( $shape ) { case 'default': $coords = array(); break; case 'rect': $coords = self::tokenizeCoords( 4, $lineNum ); if ( !is_array( $coords ) ) { return $coords; } break; case 'circle': $coords = self::tokenizeCoords( 3, $lineNum ); if ( !is_array( $coords ) ) { return $coords; } break; case 'poly': $coords = array(); $coord = strtok( " \t" ); while ( $coord !== false ) { $coords[] = $coord; $coord = strtok( " \t" ); } if ( !count( $coords ) ) { return self::error( 'imagemap_missing_coord', $lineNum ); } break; default: return self::error( 'imagemap_unrecognised_shape', $lineNum ); } # Scale the coords using the size of the source image foreach ( $coords as $i => $c ) { $coords[$i] = intval( round( $c * $scale ) ); } # Construct the area tag $attribs = array(); if ( $externLink ) { $attribs['href'] = $title; $attribs['class'] = 'plainlinks'; if ( $wgNoFollowLinks ) { $attribs['rel'] = 'nofollow'; } } else { $attribs['href'] = $title->escapeLocalURL() . $title->getFragmentForURL(); } if ( $shape != 'default' ) { $attribs['shape'] = $shape; } if ( $coords ) { $attribs['coords'] = implode( ',', $coords ); } if ( $alt != '' ) { if ( $shape != 'default' ) { $attribs['alt'] = $alt; } $attribs['title'] = $alt; } if ( $shape == 'default' ) { $defaultLinkAttribs = $attribs; } else { $output .= Xml::element( 'area', $attribs ) . "\n"; } if ( $externLink ) { $extLinks[] = $title; } else { $links[] = $title; } } if ( $first ) { return self::error( 'imagemap_no_image' ); } if ( $output == '' && $defaultLinkAttribs == '' ) { return self::error( 'imagemap_no_areas' ); } elseif ( $output == '' && $defaultLinkAttribs != '' ) { // no areas defined, default only. It's not a real imagemap, so we do not need some tags $realmap = false; } if ( $realmap ) { # Construct the map $mapName = "ImageMap_" . ++self::$id; $output = "\n"; # Alter the image tag $imageNode->setAttribute( 'usemap', "#$mapName" ); } # Add a surrounding div, remove the default link to the description page $anchor = $imageNode->parentNode; $parent = $anchor->parentNode; $div = $parent->insertBefore( new DOMElement( 'div' ), $anchor ); $div->setAttribute( 'style', 'position: relative;' ); if ( $defaultLinkAttribs ) { $defaultAnchor = $div->appendChild( new DOMElement( 'a' ) ); foreach ( $defaultLinkAttribs as $name => $value ) { $defaultAnchor->setAttribute( $name, $value ); } $imageParent = $defaultAnchor; } else { $imageParent = $div; } $imageParent->appendChild( $imageNode->cloneNode( true ) ); $parent->removeChild( $anchor ); # Determine whether a "magnify" link is present $xpath = new DOMXPath( $domDoc ); $magnify = $xpath->query( '//div[@class="magnify"]' ); if ( !$magnify->length && $descType != self::NONE ) { # Add image description link if ( $descType == self::TOP_LEFT || $descType == self::BOTTOM_LEFT ) { $descLeft = 0; } else { $descLeft = $thumbWidth - 20; } if ( $descType == self::TOP_LEFT || $descType == self::TOP_RIGHT ) { $descTop = 0; } else { $descTop = $thumbHeight - 20; } $descAnchor = $div->appendChild( new DOMElement( 'a' ) ); $descAnchor->setAttribute( 'href', $imageTitle->escapeLocalURL() ); $descAnchor->setAttribute( 'title', wfMsgForContent( 'imagemap_description' ) ); $descAnchor->setAttribute( 'style', "position:absolute; top: {$descTop}px; left: {$descLeft}px;" ); $descImg = $descAnchor->appendChild( new DOMElement( 'img' ) ); $descImg->setAttribute( 'alt', wfMsgForContent( 'imagemap_description' ) ); $descImg->setAttribute( 'src', "$wgScriptPath/extensions/ImageMap/desc-20.png" ); $descImg->setAttribute( 'style', 'border: none;' ); } # Output the result # We use saveXML() not saveHTML() because then we get XHTML-compliant output. # The disadvantage is that we have to strip out the DTD $output .= preg_replace( '/<\?xml[^?]*\?>/', '', $domDoc->saveXML() ); # Register links $parser->mOutput->addImage( $imageTitle->getDBkey() ); foreach ( $links as $title ) { $parser->mOutput->addLink( $title ); } if ( isset( $extLinks ) ) { foreach ( $extLinks as $title ) { $parser->mOutput->addExternalLink( $title ); } } # Armour output against broken parser $output = str_replace( "\n", '', $output ); return $output; } static function tokenizeCoords( $count, $lineNum ) { $coords = array(); for ( $i = 0; $i < $count; $i++ ) { $coord = strtok( " \t" ); if ( $coord === false ) { return self::error( 'imagemap_missing_coord', $lineNum ); } if ( !is_numeric( $coord ) || $coord > 1e9 || $coord < 0 ) { return self::error( 'imagemap_invalid_coord', $lineNum ); } $coords[$i] = $coord; } return $coords; } static function error( $name, $line = false ) { return wfMsgForContent( $name, $line ); } } ?>