Overview

A simple Scheme interpreter built by following this tutorial. The aim of this project was to learn Haskell and for a quick introduction to writing interpreters.

How to use it

Compile with ghc scheme.hs to create a binary of the interpreter. You can then choose run the interpreter in interactive mode or execute a script by passing it as an argument.

For example, interactive mode:

$ ./scheme
scheme> (+ 1 2 3)
6
scheme> (define (square x) (* x x))
...
scheme> (square 2)
4

The library

To make scripting easier, the file lib.scm contains predefined functions to mimic the standard library. To use it, put (load "lib.scm") at the beginning of you script. It can also be used in the REPL:

$ ./scheme
scheme> (load "lib.scm")
"Library loaded correctly"
scheme> (map (curry + 1) (list 1 2 3))
(2 3 4)
scheme> (filter even? (make-range 0 10))
(0 2 4 6 8 10)

The library is also an example of what can be done with such a basic intepreter.