public function findDot($id)
    {
        $chunks = explode('.', $id);
        $first  = array_shift($chunks);
        $value  = $this->findVariableInStack($first, $this->stack);

        foreach ($chunks as $chunk) {
            if ($value === '') {
                return $value;
            }

            $value = $this->findVariableInStack($chunk, array($value));
        }

        return $value;
    }