check_re.py 文件源码

def visit_BinOp(self, node):
        if isinstance(node.op, ast.BitOr):
            op = operator.or_
        elif isinstance(node.op, ast.Add):
            op = operator.add
        else:
            raise BadConst
        values = [
            self.visit(node.left),
            self.visit(node.right),
        ]
        if all(isinstance(v, RegexpFlag) for v in values):
            return RegexpFlag(op(*values))
        else:
            raise BadConst