Exception parsing Constructor with conditional initializers

[bbczeuz]

Minimum crashing example

struct MyObject
{
 MyObject();
 private:
 int testing;
 void *output_file_handle_;
}; 

MyObject::MyObject()
 : testing(0),
#if 1 
 output_file_handle_(nullptr)
#endif
{
}

Tested with:

user@host:~$ cppclean main.cpp 
Traceback (most recent call last):
 File "/home/user/.local/bin/cppclean", line 166, in <module>
 sys.exit(main())
 ^^^^^^
 File "/home/user/.local/bin/cppclean", line 139, in main
 entire_ast = list([_f for _f in builder.generate() if _f])
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/user/.local/share/pipx/venvs/cppclean/lib/python3.12/site-packages/cpp/ast.py", line 675, in generate
 result = self._generate_one(token)
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/user/.local/share/pipx/venvs/cppclean/lib/python3.12/site-packages/cpp/ast.py", line 753, in _generate_one
 return self._get_method(temp_tokens, 0, None, False)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/home/user/.local/share/pipx/venvs/cppclean/lib/python3.12/site-packages/cpp/ast.py", line 1098, in _get_method
 member = member[0]
 ~~~~~~^^^
IndexError: list index out of range

Exception is thrown here:

 # Handle ctor initializers.
 # Supports C++11 method of direct initialization with braces.
 initializers = {}
 if token.name == ':':
 while token.name != ';' and token.name != '{':
 # skip preprocesors macros
1094 if token.name.startswith(('#if', '#elif', '#else', '#endif')):
1095 token = self._get_next_token()
1096 continue
1097 member, token = self.get_name()
1098 member = member[0]
 if token.name == '(' or token.name == '{':
 end = '}' if token.name == '{' else ')'
 initializers[member] = [
 x for x in list(self._get_matching_char(token.name,
 end))
 if x.name != ',' and x.name != end]
 token = self._get_next_token()

On line 1097: member is empty; token is Token('#if 1', 133, 138)
It seems as the check on line 1094 fails.

Workaround

Adapt code so that all initializers are within the same preprocessor condition:

MyObject::MyObject()
#if SOME_CONDITION
 : testing(0), output_file_handle_(nullptr)
#endif
{
}