Along the same line, there's also invertible syntax descriptions https://gist.github.com/tfausak/a8d7f135bf76e64ea6f35d3be692cbeb https://gist.github.com/tfausa

Along the same line, there's also invertible syntax descriptions https://gist.github.com/tfausak/a8d7f135bf76e64ea6f35d3be692cbeb https://gist.github.com/tfausak/a8d7f135bf76e64ea6f35d3be692... , which allow one definition to create both a parser and pretty-printer