Hacky solution for PEG such as adding a context stack requires careful management of the entry/exit point, but the more fundamental problem is that you still can't "switch" syntax, or you have to add all possible syntax combination depending on the numbers of such stacks. I believe persistent data structure and transactional data structure would help but I just couldn't find a formalism for that.
Make your parser call back into your lexer, so it can pass state to it; make the set of type names available to it.
Link: https://app.codecrafters.io/courses/interpreter/overview
azhenley•1h ago
2020 with 777 points: https://news.ycombinator.com/item?id=22788738
2024 with 607 points: https://news.ycombinator.com/item?id=40950235