95 lines
2.9 KiB
Scheme
Executable File
95 lines
2.9 KiB
Scheme
Executable File
;;; -*-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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;;; scm.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 (list . rest) rest)
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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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(#t (loop2 (eval e a) (readenv a) a))
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;;(#t (loop2 ((cdr (assoc 'eval a)) e a) (readenv a) a))
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))
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;;(display 'loop:read-loop2-exiting...)
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;;(newline)
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EOF
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(define (+ x y) (- x (- 0 y)))
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(define-macro (and x y)
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(cond (x y)
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(#t #f)))
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(define-macro (or x y)
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(cond (x x)
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(#t y)))
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(define (split-params bindings params)
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(cond ((null bindings) params)
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(#t (split-params (cdr bindings)
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(append params (cons (caar bindings) '()))))))
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(define (split-values bindings values)
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(cond ((null bindings) values)
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(#t (split-values (cdr bindings)
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(append values (cdar bindings) '())))))
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(define-macro (let bindings . body)
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(cons (cons 'lambda (cons (split-params bindings '()) body))
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(split-values bindings '())))
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(define (expand-let* bindings body)
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(cond ((null bindings)
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(cons (cons 'lambda (cons '() body)) '()))
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(#t
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(cons
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(cons 'lambda (cons (cons (caar bindings) '())
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(cons (expand-let* (cdr bindings) body) '())))
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(cdar bindings)))))
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(define-macro (let* bindings . body)
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(expand-let* bindings body))
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