0

我是 LibCST 的新手。我正在编写一个工具而不是修改代码。我想将一个 elif (orelse=If) 添加到现有的 If elif else 节点。简单的例子：

# before
if data == "a":
   execute_a(data)
elif data == "b":
   execute_b(data)
else:
   raise RuntimeError("switch not recognized")

#after
if data == "a":
   execute_a(data)
elif data == "inserted":
   execute_inserted(data)
elif data == "b":
   execute_b(data)
else:
   raise RuntimeError("switch not recognized")

我的代码如下所示：

def leave_Try(self, node: cst.Try, updated_node: cst.Try):
    # we now have enough information to make the insertion
    
    if self.in_dispatcher:
        self.in_dispatcher = False

        # first let's generate a new if
        new_if_str = build_command_str("New_Intent", "New_command")
        new_if = cst.parse_module(new_if_str).code

        #new_if is a module not an if, we may need to modify it.
            
        # now lets make last_if point to the new 
        self.last_if.orelse = new_if
            
        #and the new_ifs orelse point to the else
        new_if.orelse = self.else_if

        # I am not sure what to call with the with_changes()
        return node

当我执行我得到的代码时：

Exception: Expected a node of type CSTNode or a RemovalSentinel, but got a return value of NoneType

我不确定是否感到惊讶，因为我没有正确更新。我觉得 Try 块是错误的地方。我做错了什么。我将不胜感激任何见解。

谢谢，安德鲁

4

0 回答 0