54 lines
1.9 KiB
Plaintext
54 lines
1.9 KiB
Plaintext
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;;; -*-scheme-*-
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;;; Mes --- Maxwell Equations of Software
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; loop.mes: This file is part of Mes.
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;;;
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;;; Mes is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Mes is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
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;; The Maxwell Equations of Software -- John McCarthy page 13
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;; http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
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(define (scm-define x a)
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(cond ((atom? (cadr x)) (cons (cadr x) (eval (caddr x) a)))
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(#t (cons (caadr x) (cons 'lambda (cons (cdadr x) (cddr x)))))))
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(define (scm-define-macro x a)
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(cons '*macro*
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(cons (cons (caadr e) (cons 'lambda (cons (cdadr e) (cddr e))))
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(cdr (assoc '*macro* a)))))
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(define (loop2 r e a)
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;; (display '____loop2)
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;; (newline)
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;; (display 'e:)
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;; (display e)
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;; (newline)
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(cond ((null? e) r)
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((eq? e 'EOF2)
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(display 'loop2-exiting...)
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(newline))
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((atom? e)
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(loop2 (eval e a) (readenv a) a))
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((eq? (car e) 'define)
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(loop2 *unspecified* (readenv a) (cons (scm-define e a) a)))
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((eq? (car e) 'define-macro)
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(loop2 *unspecified* (readenv a) (cons (scm-define-macro e a) a)))
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((eq? (car e) 'set!)
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(loop2 (set-cdr! (assoc (cadr e) a) (eval (caddr e) a)) (readenv a) a))
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(#t (loop2 (eval e a) (readenv a) a))))
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EOF
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