Ziglisp

A yet another Lisp interpreter written in Zig.

Disclaimer: the author make it for his own learning Zig purposes, so the quality is just that.

Usage

• zig run src/main.zig to start REPL.
• zig run src/main.zig -- src/examples/mergesort.scm to evaluate file.

$ zig run src/main.zig
>>> (print '(hello world))
#print: (hello world)
(hello world)
>>> 

$ cat src/examples/y-comb.scm 
(let ((f (lambda (fib)
           (lambda (n)
             (cond ((= n 0) 0)
                   ((= n 1) 1)
                   (1 (+ (fib (- n 1)) (fib (- n 2))))))))
      (y (lambda (f)
           ((lambda (x) (f (lambda (m) ((x x) m))))
            (lambda (x) (f (lambda (m) ((x x) m))))))))
  ((y f) 10)) ; The 10th fibonacci number
$ zig run src/main.zig -- src/examples/y-comb.scm 
55

Developed under Zig version 0.12.0-dev.789+e6590fea1.

Features

Data types

• Cons cell
• Function
• Number (i64)
• Symbol ([]const u8)

Built-in functions and special forms

Basically respecting R5RS Scheme.

• Functions
  • *
  • +
  • -
  • <
  • =
  • and
  • car
  • cdr
  • cons
  • list
  • modulo
  • null?
  • or
  • print
  • quotient
• Special forms:
  • begin
  • cond
  • define
  • if
  • lambda
  • let
  • quote

Additionally see builtin.scm.

TODOs

• Lambda.
• Macro syntax.
• Represent environment by tree structure.
• GC.

License

MIT