gen_stream_operator.py

import clang.cindex
from clang.cindex import Index


def gen_stream_operator(cur):
    if cur.kind.name == "STRUCT_DECL":
        print("std::ostream& operator<<(std::ostream& os, const %s& rhs) {" % cur.displayname)
        for child in cur.get_children():
            if child.kind.name == "FIELD_DECL":
                print('    os << "{member}:" << rhs.{member} << std::endl;'.format(member=child.displayname))
        print("    return os;")
        print("}")
    else:
        for child in cur.get_children():
            gen_stream_operator(child)

            
def main():
    index = Index.create()
    tu = index.parse("./test.cpp")
    gen_stream_operator(tu.cursor)


if __name__ == "__main__":
    main()
    """
    std::ostream& operator<<(std::ostream& os, const Test& rhs) {
        os << "x:" << rhs.x << std::endl;
        os << "y:" << rhs.y << std::endl;
        os << "z:" << rhs.z << std::endl;
        return os;
    }
    """

test.cpp

struct Test {
  int x;
  int y;
  int z;
};

int main() {
  return 0;
}