Screme is a really basic Scheme interpretor written in Ruby. This was built as toy for learning and is not intended to be a serious language to write code in.

I don't intend to do anything with this, consider this public domain abandonware.

I figure its better off on GitHub than getting lost on my hard drive. I've done a minimal amount of work to add this README file and add bundler support. Otherwise, this project hasn't been touched since around 2010.

Screme provides a Read-Eval-Print-Loop where you can evaluate Screme code on the fly:

$ rake repl
Screme REPL
>

Here's a function that computes the n^th number of the Fibonacci sequence (note that Screme is not tail-recursive):

(define fib
  (lambda (n)
    (if (< n 2)
      n
      (+ (fib (- n 1)) (fib (- n 2))))))

Scheme has three test suites:

1. Specs written in Ruby that tests most parts of the implementation of the interpretor. You can run them with just rake spec.
2. Native functional tests written in Screme. This tests the languages runtime among other thigns. You can run them with cd test && ruby native_test.rb *.scm.