mes-m2/test/test020/define-macro.scm

;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU 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.
;;;
;;; GNU 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 GNU Mes.  If not, see <http://www.gnu.org/licenses/>

;; Setup output file
(set-current-output-port (open-output-file "test/results/test020.answer"))

(define (newline) (display #\newline))

;; Start with a simple example
(define-macro (foo a) (list 'quote a))
(display (foo bar))
(newline)

;; Let us make it more complex
(define-macro (bar a) (reverse (list a 'quote)))
(display (bar baz))
(newline)

;; Let us see if we can add a new primitive
(define-macro (backwards . body)
	(cons 'begin
		(reverse body)))

;; now to use it
(backwards
	(newline)
	(display 3)
	(newline)
	(display 2)
	(newline)
	(display 1))

(exit 0)