This is a skeleton showing how to start writing a tiny interpreter in OCaml. It just parses, pretty-prints, and evaluates a trivial arithmetic AST.
To build the project, you will need Dune v1.10.0+.
You can install it using opam install dune.
There is one dependency: Menhir.
If you don't already have it, this will work to get it (or you can just do opam install menhir):
$ dune build @check # Generate the OPAM file.
$ opam install . --deps-only
You can build the project and run an example in one step:
$ echo '8*(3+2)+2' | dune exec calc
If you just need to compile, use dune build.
Or, to watch for changes and automatically rebuild, install fswatch and then:
$ dune build --watch
Explore the implementation in a utop REPL:
$ opam install utop
$ dune utop src
This repository contains:
src/: The language implementation.bin/calc.ml: A tool that reads a program from standard input.dune-project,src/dune, andbin/dune: The build configuration for Dune.