305 lines
7.8 KiB
Scheme
305 lines
7.8 KiB
Scheme
#! /bin/sh
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# -*-scheme-*-
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exec ./mes "$@" < "$0"
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!#
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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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;;; 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 programming -- 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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;; loop adds definitions of mes.mes to current-environment
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;;mes.mes
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;; ;; -*-scheme-*-
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;; ;;
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;; (define (caar x) (car (car x)))
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;; (define (cadr x) (car (cdr x)))
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;; (define (cdar x) (cdr (car x)))
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;; (define (cddr x) (cdr (cdr x)))
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;; (define (caadr x) (car (car (cdr x))))
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;; (define (caddr x) (car (cdr (cdr x))))
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;; (define (cddar x) (cdr (cdr (car x))))
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;; (define (cdadr x) (cdr (car (cdr x))))
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;; (define (cadar x) (car (cdr (car x))))
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;; (define (cdddr x) (cdr (cdr (cdr x))))
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;; ;; Page 12
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;; (define (pairlis x y a)
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;; (debug "pairlis x=~a y=~a a=~a\n" x y a)
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;; (cond
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;; ((null x) a)
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;; (#t (cons (cons (car x) (car y))
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;; (pairlis (cdr x) (cdr y) a)))))
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;; (define (assoc x a)
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;; ;;(stderr "assoc x=~a\n" x)
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;; ;;(debug "assoc x=~a a=~a\n" x a)
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;; (cond
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;; ((null a) #f)
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;; ((eq (caar a) x) (car a))
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;; (#t (assoc x (cdr a)))))
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;; ;; Page 13
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;; (define (eval-quote fn x)
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;; (debug "eval-quote fn=~a x=~a" fn x)
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;; (apply fn x '()))
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(define (evcon c a)
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;;(debug "evcon c=~a a=~a\n" c a)
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(cond
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;; single-statement cond
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;; ((eval (caar c) a) (eval (cadar c) a))
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((eval (caar c) a)
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(cond ((null (cddar c)) (eval (cadar c) a))
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(#t (eval (cadar c) a)
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(evcon
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(cons (cons #t (cddar c)) '())
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a))))
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(#t (evcon (cdr c) a))))
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(define (evlis m a)
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;;(debug "evlis m=~a a=~a\n" m a)
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(cond
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((null m) '())
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(#t (cons (eval (car m) a) (evlis (cdr m) a)))))
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(define (apply fn x a)
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;; (display 'mes-apply:)
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;; (newline)
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;; (display 'fn:)
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;; (display fn)
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;; (newline)
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;; (display 'builtin:)
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;; (display (builtin fn))
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;; (newline)
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;; (display 'x:)
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;; (display x)
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;; (newline)
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(cond
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((atom fn)
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(cond
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((builtin fn)
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(call fn x))
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(#t (apply (eval fn a) x a))))
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((eq (car fn) 'lambda)
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(cond ((null (cdr (cddr fn)))
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(eval (caddr fn) (pairlis (cadr fn) x a)))
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(#t
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(eval (caddr fn) (pairlis (cadr fn) x a))
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(apply (cons (car fn) (cons (cadr fn) (cdddr fn)))
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x
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(pairlis (cadr fn) x a)))))
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((eq (car fn) 'label) (apply (caddr fn) x (cons (cons (cadr fn)
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(caddr fn)) a)))))
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(define (eval e a)
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;;(debug "eval e=~a a=~a\n" e a)
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;;(debug "eval (atom ~a)=~a\n" e (atom e))
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;; (display 'mes-eval:)
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;; (display e)
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;; (newline)
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;; (display 'a:)
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;; (display a)
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;; (newline)
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;;(display 'pair?*macro*:)
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;;(display (assoc '*macro* a))
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;; (display (cdr (assoc '*macro* a)))
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;; (newline)
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(cond
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((number e) e)
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((eq e #t) #t)
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((eq e #f) #f)
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((atom e) (cdr (assoc e a)))
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((builtin e) e)
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((atom (car e))
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(cond
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((eq (car e) 'quote) (cadr e))
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((eq (car e) 'cond) (evcon (cdr e) a))
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(;;#f ;; #f: no macro support
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#t ;; #t: macro support
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(cond
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((eq (assoc '*macro* a) #f)
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(display 'we-have-no-macros:)
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(display e)
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(newline)
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(apply (car e) (evlis (cdr e) a) a)
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)
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((pair (assoc (car e) (cdr (assoc '*macro* a))))
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;; (display 'expanz0r:)
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;; (display (assoc (car e) (cdr (assoc '*macro* a))))
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;; (newline)
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;; (display 'running:)
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;; (display (cdr (assoc (car e) (cdr (assoc '*macro* a)))))
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;; (newline)
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;; (display 'args:)
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;; (display (cdr e))
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;; (newline)
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;; (display '==>args:)
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;; (display (evlis (cdr e) a))
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;; (newline)
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(eval (apply
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(cdr (assoc (car e) (cdr (assoc '*macro* a))))
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(evlis (cdr e) a)
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a)
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a))
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(#t
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(apply (car e) (evlis (cdr e) a) a))))
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(#t (apply (car e) (evlis (cdr e) a) a))))
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(#t (apply (car e) (evlis (cdr e) a) a))))
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;; readenv et al works, but slows down dramatically
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(define (DISABLED-readenv a)
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(readword (getchar) '() a))
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(define (readword c w a)
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;; (display 'readword:)
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;; (display c)
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;; (newline)
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(cond ((eq c -1) ;; eof
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(cond ((eq w '()) '())
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(#t (lookup w a))))
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((eq c 10) ;; \n
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(cond ((eq w '()) (readword (getchar) w a))
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(#t (lookup w a))))
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((eq c 32) ;; \space
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(readword 10 w a))
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((eq c 40) ;; (
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(cond ((eq w '()) (readlis a))
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(#t (ungetchar c) (lookup w a))))
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((eq c 41) ;; )
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(cond ((eq w '()) (ungetchar c) w)
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(#t (ungetchar c) (lookup w a))))
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((eq c 39) ;; '
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(cond ((eq w '())
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(cons (lookup (cons c '()) a)
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(cons (readword (getchar) w a) '())))
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(#t (ungetchar c) (lookup w a))))
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((eq c 59) ;; ;
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(readcomment 59)
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(readword 10 w a))
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(#t (readword (getchar) (append w (cons c '())) a))))
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(define (readlis a)
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;; (display 'readlis:)
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;; (newline)
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(cond ((eq (peekchar) 41) ;; )
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(getchar)
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'())
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(#t (xcons (readlis a) (readword (getchar) '() a)))))
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(define (xcons a b)
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(cons b a))
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(define (readcomment c)
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(cond ((eq c 10) ;; \n
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c)
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(#t (readcomment (getchar)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; we also add helpers to make loop2 simpler
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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 (scm-display x)
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(display x))
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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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;; loop2 skips one read:
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'this-is-skipped-scm
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(display 123)
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4
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(newline)
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(display 'hello-display-symbol)
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(newline)
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(display '(0 1 2))
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(newline)
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(display (- 12 3))
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(newline)
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(define (+ x y) (- x (- 0 y)))
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(display (+ 3 4))
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(newline)
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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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(display 'and-0-1:)
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(display (and 0 1))
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(newline)
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(display 'and-#f-2:)
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(display (and #f 2))
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(newline)
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(display 'or-0-1:)
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(display (or 0 1))
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(newline)
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(display 'or-#f-2:)
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(display (or #f 2))
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(newline)
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'()
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EOF2
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EOF
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