I read the book Crafting Interpreters by
Bob Nystrom and this is an interpreter implementation for the language Lox
that he created for the book. The first part of the book where you write the
interpreter is now finished and is really worth a look. It helped me learn a lot
about programming languages in general and also helped me to teach me some
haskell.
You can find the code to the book on github. The repository is linked as a submodule.
Thank you Bob for writing this.
This implementation of a Lox interpreter is closely modelled after the originial java implementation from the craftinginterpreters book. Both interpreters should be mostly compatible but don't take my word for that.
I got sidetracked with my first two attemtpts at implementing this interpreter while waiting for the book to finish. Since this is my third time I didn't want to re-read the book again. This time I decided to just look at the Java sources and translate them to haskell as close as possible. I might refactor some of this later.
To build and run the interpreter you will need a version of stack.
stack build
stack run -- [filename]
You can invoke loxomotive either with zero args to start the repl or with a
file to interpret that file
loxomotive v1.0.0
Usage: loxomotive [filename]