pure

Implementation of pure lisp.
(But already it's not 'pure'.pure has many optional functions.)

Build & Test

$ make
$ make test
$ ./test

Usage

1.REPL interface

$ ./pure
> 1
1
>

2. Running source file

$ ./pure [filename]

3. Running from stdin source code

$ echo "(print 1)" | ./pure
1

Spec

Special Form

Implements the following Special Form.

• if
• quote
• lambda
• define

Primitive Functions

Implements the following functions.

• atom
• eq
• car
• cdr
• cons
• print
• +
• -
• *
• /
• %
• <
• >
• <=
• >=

Garbage Collection

pure has adopted a conservative Mark & Sweep GC.

Scope

pure has adopted a lexical scope.

Example

Implementation of [tak function](https://en.wikipedia.org/wiki/Tak_(function) is as follows:

(define tak (lambda (x y z)
  (if (<= x y)
    y
    (tak
      (tak (- x 1) y z)
      (tak (- y 1) z x)
      (tak (- z 1) x y)))))

(print (tak 10 5 0))

License

MIT