Something to consider is a parser generator for your language. They get a lot of flack online these days for some reason from people saying "a recursive descent

Something to consider is a parser generator for your language. They get a lot of flack online these days for some reason from people saying "a recursive descent parser is faster and not that hard", but they're generally time consuming if you just want to get something going. PLY (or maybe it's SLY now) for Python is really great.