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I had to design a simple general purpose language for university, so I tried creating "ZoomerScript" with Jetbrains MPS
(infosec.pub)
Insert <it's not much but it's honest work> meme. It only supports ints and bools, some logic and simple arithmetics and it compiles to Java but damn was it hard to get that far.
Can you guess what everything does?
Valuable input! I actually am an undergrad student. There are a lot of frameworks out there that support writing languages, with MPS being one of them.
If I'd start from scratch again and had a little more time, I'd frankly try writing an interpreter myself, instead of trying to conform to weird framework syntax, which I won't be able to reuse in any other context.
Saying syntax design is fiddly is an understatement. I focused very hard on getting an abstract syntax somehow finished before working on generation in my first iteration. Then I had so much technical debt, that I couldn't get anything to work and had to rewrite a lot. So I scrapped it all and started again, starting with top level concepts including generation and only implementing some lower level ones, once everything around it worked properly.