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schani / forthlisp

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A Small Lisp in Forth

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Lisp in Forth How to use it

README.md

 Lisp in Forth

This is an interpreter for a really simple dynamically scoped Scheme
dialect. It only runs with Gforth, because it uses Gforth's structs
to implement its data structures. One of the more involved parts of
this interpreter is the reader, where I had to do quite a lot of
stack juggling to keep everything in line. It doesn't look very
involved now but I remember spending quite some time thinking about
the stack layout for the reader routines.

 How to use it

Assuming you have Gforth installed (if you're on MacOS you can get it
via Brew), start it with

gforth lisp.fs

There are mainly three words of interest:

  * lisp-load-from-string reads and evaluates a string.

  * lisp-load-from-file reads and evaluates a file, given a filename.

  * lisp-display prints a lisp value.

Example:

s" (+ 1 2 3)" lisp-load-from-string lisp-display
=> 6 ok

s" test.scm" lisp-load-from-file lisp-display
=> 4 120 () ok

In this example, 4 and 120 are printed in test.scm, and () is the
result of the evaluation of the file.

About

A Small Lisp in Forth

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Readme

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Languages

  * Forth 98.3%
  * Scheme 1.7%

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