protected function naiveHandleExpression($node)
    {
        if ($node->getOperator() == '~') {

            $left = $this->operandStack->pop();
            if ($left === null) {
                throw new SyntaxErrorException();
            }

            $node->setOperator('-');
            $node->setLeft($left);

            return $node;
        }

        $right = $this->operandStack->pop();
        $left = $this->operandStack->pop();
        if ($right === null || $left === null) {
            throw new SyntaxErrorException();
        }

        $node->setLeft($left);
        $node->setRight($right);

        return $node;
    }