protected function parseMultiLine($line, \SplFileObject $file, &$lineBreaks)
    {
        while ($this->isMultiLine($line) && $file->valid()) {
            $lineBreaks[] = strlen($line);

            $line2 = $file->getCurrentLine();

            // trim the ending slash
            $line = rtrim($line, '\\');
            // concatenate with next line
            $line = trim($line . $line2);

        }
        return $line;
    }