Toy LISP

This is a toy implementation of lisp, written in python, just for fun.

use:

• run

  ./lisp.py

  to get the interactive interpreter (which stops working after the first error...)

• run

  ./lisp.py filename

  to run the program in the file.

• run

  cat file1 fil2 file 3 | ./lisp.py

  to run a multi-file program.

Syntax

This uses the standard lisp syntax, like this:

(print 
    (+ 1 2
       (* 2 3)))
(defun f (x) 
    (if (> x 0)
        (f (- x 10))
        (0)))
(list 1 2 3)
(defvar x (list 4 5 6))

etc.

Built-in functions:

• Math: +, -, *, /, %, and pow
• List: cat, first, rest, last, list
• Functions and variables: defun, defmacro, defvar, set, let
• Logic: equal, >, <, or, not, and
• Output: print
• Control flow: if, do, while