def abspath(self, groups):
        return (groups[0] if groups[0].startswith(os.sep) else os.path.join(self.source_path, groups[0]),) + groups[1:]
Group filter that turns source-relative paths into absolute paths.
dataset/ETHPy150Open catkin/catkin_tools/catkin_tools/jobs/commands/cmake.py/CMakeIOBufferProtocol.abspath