Ventonegro

As part of my Lisp studies, I have implemented a toy Scheme interpreter in roughly 1000 lines of Lua. It is here. It supports tail-call optimisation, lexical scope for closures, and first-class continuations via call/cc.

I have departed from the traditional approach of implementing a Scheme interpreter in Scheme itself because I wanted to avoid possible confusions between the defined language and the defining language. This has made a lot of the concepts clearer. The evaluator is written in continuation-passing style, which is easily done in Lua because the latter has tail-call optimisations. This way it is easier to reify continuations to first-class values.

I have also added a few primitives to allow me to run some examples, as the factorial and fibonacci functions. More primitives can be easily added if desired.