我对 python 和 pycparser 比较陌生。我已经使用来自https://github.com/eliben/pycparser的 c-to-c.py 文件将 c 文件解析为 AST 。我现在正在尝试使用 AST 制作 CFG，但我无法将 .show() 中的信息作为字符串存储。我该如何存储这个 .show() 信息，我尝试使用test=ast.children()[0][1].show()但是当我尝试打印test它时显示“无”。那么还有其他存储方式吗？或者是否有另一种方法可以用来读取 .show() 信息。谢谢你。
def show(self, buf=sys.stdout, offset=0, attrnames=False, nodenames=False, showcoord=False, _my_node_name=None):
""" Pretty print the Node and all its attributes and
children (recursively) to a buffer.
buf:
Open IO buffer into which the Node is printed.
offset:
Initial offset (amount of leading spaces)
attrnames:
True if you want to see the attribute names in
name=value pairs. False to only see the values.
nodenames:
True if you want to see the actual node names
within their parents.
showcoord:
Do you want the coordinates of each Node to be
displayed.
"""
lead = ' ' * offset
if nodenames and _my_node_name is not None:
buf.write(lead + self.__class__.__name__+ ' <' + _my_node_name + '>: ')
else:
buf.write(lead + self.__class__.__name__+ ': ')
if self.attr_names:
if attrnames:
nvlist = [(n, getattr(self,n)) for n in self.attr_names]
attrstr = ', '.join('%s=%s' % nv for nv in nvlist)
else:
vlist = [getattr(self, n) for n in self.attr_names]
attrstr = ', '.join('%s' % v for v in vlist)
buf.write(attrstr)
if showcoord:
buf.write(' (at %s)' % self.coord)
buf.write('\n')
for (child_name, child) in self.children():
child.show(
buf,
offset=offset + 2,
attrnames=attrnames,
nodenames=nodenames,
showcoord=showcoord,
_my_node_name=child_name)