I usually write parsers by starting from a grammar and either coding a lexer/parser by hand or relying on tools such as the fantastic Antlr. However, a friend recently introduced me to parser combinators, which I found to be very interesting and useful. It’s not a recent idea, but it was new to me, and I have found it to be very interesting and useful. I have played a bit with a great Rust library called nom, and I had a lot of fun with it.
