[^\?\)\:]*)\??[^\)]*[\'"]?\)/'; $files = array(); if ( preg_match_all( $pattern, $source, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER ) ) { foreach ( $matches as $match ) { $file = ( isset( $path ) ? rtrim( $path, '/' ) . '/' : '' ) . "{$match['file'][0]}"; // Only proceed if we can access the file if ( file_exists( $file ) ) { $files[] = $file; } } } return $files; } /** * Remaps CSS URL paths and automatically embeds data URIs for URL rules preceded by an /* @embed * / comment * * @param $source string CSS data to remap * @param $path string File path where the source was read from * @return string Remapped CSS data */ public static function remap( $source, $path ) { global $wgUseDataURLs; $pattern = '/((?\s*\/\*\s*\@embed\s*\*\/)(?[^\;\}]*))?url\([\'"]?(?[^\?\)\:]*)\??[^\)]*[\'"]?\)(?[^;]*)[\;]?/'; $offset = 0; while ( preg_match( $pattern, $source, $match, PREG_OFFSET_CAPTURE, $offset ) ) { // Shortcuts $embed = $match['embed'][0]; $rule = $match['rule'][0]; $extra = $match['extra'][0]; $file = "{$path}/{$match['file'][0]}"; // Only proceed if we can access the file if ( file_exists( $file ) ) { // Add version parameter as a time-stamp in ISO 8601 format, using Z for the timezone, meaning GMT $url = "{$file}?" . gmdate( 'Y-m-d\TH:i:s\Z', round( filemtime( $file ), -2 ) ); // Detect when URLs were preceeded with embed tags, and also verify file size is below the limit if ( $wgUseDataURLs && $match['embed'][1] > 0 && filesize( $file ) < self::EMBED_SIZE_LIMIT ) { // If we ever get to PHP 5.3, we should use the Fileinfo extension instead of mime_content_type $type = mime_content_type( $file ); // Strip off any trailing = symbols (makes browsers freak out) $data = base64_encode( file_get_contents( $file ) ); // Build 2 CSS properties; one which uses a base64 encoded data URI in place of the @embed // comment to try and retain line-number integrity , and the other with a remapped an versioned // URL and an Internet Explorer hack making it ignored in all browsers that support data URIs $replacement = "{$rule}url(data:{$type};base64,{$data}){$extra};{$rule}url({$url}){$extra}!ie;"; } else { // Build a CSS property with a remapped and versioned URL $replacement = "{$embed}{$rule}url({$url}){$extra};"; } // Perform replacement on the source $source = substr_replace( $source, $replacement, $match[0][1], strlen( $match[0][0] ) ); // Move the offset to the end of the replacement in the source $offset = $match[0][1] + strlen( $replacement ); continue; } // Move the offset to the end of the match, leaving it alone $offset = $match[0][1] + strlen( $match[0][0] ); } return $source; } /** * Removes whitespace from CSS data * * @param $source string CSS data to minify * @return string Minified CSS data */ public static function minify( $css ) { return trim( str_replace( array( '; ', ': ', ' {', '{ ', ', ', '} ', ';}' ), array( ';', ':', '{', '{', ',', '}', '}' ), preg_replace( array( '/\s+/', '/\/\*.*?\*\//s' ), array( ' ', '' ), $css ) ) ); } }