If you want to generate bindings to a language that is not currently supported, you can write your own generator.
First you need to setup your generator by running:
python sdl_parser.py --new <some-name>
This should create a file named <some-name>.py inside the gen folder with the needed structure.
Now all that's left is a matter replacing all those raises with your code and calling py sdl_parser.py gen.<your-gen-file> --my-args=my-values when you are done. The visitor.Visitor class contains documentation showing the structure of the data that is passed to each of the visit_* methods. For further help, you can check the already present generators such as the C++ one. As for the constructor parameters, they are passed from the command lines. Keyword parameters (those after * in the constructor) need to be specified if they don't have a default value (or else the script will tell you to specify them and terminate) and can be omitted if they have a default value.
If you need to provide certain files along with your generated code, you can place them inside the gen/<your-gen-file>/ folder and they will be automatically copied to out/<your-gen-file>/ once everything is done (eg. the cs generator has a String.cs file inside the gen/cs/ folder that contains string-related utilities). Such files can be files that adapt certain APIs or examples that show how to use the bindings.
If you think your generator would be helpful to the community, please submit a PR to the project.