mes/scm.mes

#! /bin/sh
# -*-scheme-*-
exec ./mes "$@" < "$0"
!#

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
;;; Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Mes.  If not, see <http://www.gnu.org/licenses/>.

;; The Maxwell Equations of Software -- John McCarthy page 13
;; http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf

(display 'boo)
(newline)

;; (display '*a*:)
;; (display (eval '*a* '()))
;; (newline)

(define (+ x y) (- x (- 0 y)))

(display (+ 3 4))
(newline)

(define-macro (and x y)
  (cond (x y)
        (#t #f)))

(define-macro (or x y)
  (cond (x x)
        (#t y)))

(define (split-params bindings params)
  (cond ((null bindings) params)
        (#t (split-params (cdr bindings)
                          (append params (cons (caar bindings) '()))))))

(define (split-values bindings values)
  (cond ((null bindings) values)
        (#t (split-values (cdr bindings)
                          (append values (cdar bindings) '())))))

(define-macro (let bindings body)
  (cons (cons 'lambda (cons (split-params bindings '()) (cons body '())))
        (split-values bindings '())))

(display 'and-0-1:)
(display (and 0 1))
(newline)

(display 'or-#f-1:)
(display (or #f 2))
(newline)