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boot.mes: boostrap into mes.

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This commit is contained in:
Jan Nieuwenhuizen 2016-05-29 13:44:03 +02:00
parent 1a565a9208
commit bd5a163654
4 changed files with 592 additions and 249 deletions
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8
GNUmakefile
View file

@ -9,5 +9,9 @@ all: mes
check: all
./mes.test
./mes.test ./mes
./mes < scm.mes
./mes.scm < scm.mes
./mes < boot.mes
# ./mes < scm.mes
# ./mes.scm < scm.mes
boot: all
./mes < boot.mes

369
boot.mes Normal file
View file

@ -0,0 +1,369 @@
#! /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 programming -- John McCarthy page 13
;; http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
;; ((label loop
;; (lambda (r e a)
;; (cond ((null e) a)
;; ((eq e 'exit)
;; (display 'loop:exiting)
;; (newline)
;; (apply 'loop2 (cons #t (cons #t (cons a '()))) a))
;; ((atom e) (loop (eval e a) (readenv a) a))
;; ((eq (car e) 'define)
;; (loop *unspecified*
;; (readenv a)
;; (cons
;; (cond ((atom (cadr e))
;; (cons (cadr e) (eval (caddr e) a)))
;; (#t
;; (newline)
;; (cons (caadr e)
;; (cons 'lambda
;; (cons (cdadr e) (cddr e))))))
;; a)))
;; (#t (loop (eval e a) (readenv a) a)))))
;; *unspecified* (readenv '()) '((*macro*)))
(display 'loop-reading...)
(newline)
;; loop adds definitions of mes.mes to current-environment
;;mes.mes
;; ;; -*-scheme-*-
;; ;;
;; (define (caar x) (car (car x)))
;; (define (cadr x) (car (cdr x)))
;; (define (cdar x) (cdr (car x)))
;; (define (cddr x) (cdr (cdr x)))
;; (define (caadr x) (car (car (cdr x))))
;; (define (caddr x) (car (cdr (cdr x))))
;; (define (cddar x) (cdr (cdr (car x))))
;; (define (cdadr x) (cdr (car (cdr x))))
;; (define (cadar x) (car (cdr (car x))))
;; (define (cdddr x) (cdr (cdr (cdr x))))
;; ;; Page 12
;; (define (pairlis x y a)
;; (debug "pairlis x=~a y=~a a=~a\n" x y a)
;; (cond
;; ((null x) a)
;; (#t (cons (cons (car x) (car y))
;; (pairlis (cdr x) (cdr y) a)))))
;; (define (assoc x a)
;; ;;(stderr "assoc x=~a\n" x)
;; ;;(debug "assoc x=~a a=~a\n" x a)
;; (cond
;; ((null a) #f)
;; ((eq (caar a) x) (car a))
;; (#t (assoc x (cdr a)))))
;; ;; Page 13
;; (define (eval-quote fn x)
;; (debug "eval-quote fn=~a x=~a" fn x)
;; (apply fn x '()))
(define (evcon c a)
;;(debug "evcon c=~a a=~a\n" c a)
(cond
;; single-statement cond
;; ((eval (caar c) a) (eval (cadar c) a))
((eval (caar c) a)
(cond ((null (cddar c)) (eval (cadar c) a))
(#t (eval (cadar c) a)
(evcon
(cons (cons #t (cddar c)) '())
a))))
(#t (evcon (cdr c) a))))
(define (evlis m a)
;;(debug "evlis m=~a a=~a\n" m a)
(cond
((null m) '())
(#t (cons (eval (car m) a) (evlis (cdr m) a)))))
(define (apply fn x a)
;; (display 'mes-apply:)
;; (newline)
;; (display 'fn:)
;; (display fn)
;; (newline)
;; (display 'builtin:)
;; (display (builtin fn))
;; (newline)
;; (display 'x:)
;; (display x)
;; (newline)
;;(debug "apply fn=~a x=~a a=~a\n" fn x a)
(cond
((atom fn)
;;(debug "(atom fn)=~a\n" (atom fn))
(cond
;; John McCarthy LISP 1.5
;; ((eq fn CAR) (caar x))
;; ((eq fn CDR) (cdar x))
;; ((eq fn CONS) (cons (car x) (cadr x)))
;; ((eq fn ATOM) (atom (car x)))
;; ((eq fn EQ) (eq (car x) (cadr x)))
((builtin fn)
(call fn x))
(#t (apply (eval fn a) x a))))
;; John McCarthy LISP 1.5
((eq (car fn) 'single-line-LAMBDA) (eval (caddr fn) (pairlis (cadr fn) x a)))
((eq (car fn) 'lambda)
;; (CDDR fn) all eval
(cond ((null (cdr (cddr fn)))
(eval (caddr fn) (pairlis (cadr fn) x a)))
(#t
(eval (caddr fn) (pairlis (cadr fn) x a))
(apply (cons (car fn) (cons (cadr fn) (cdddr fn)))
x
(pairlis (cadr fn) x a)))))
((eq (car fn) 'label) (apply (caddr fn) x (cons (cons (cadr fn)
(caddr fn)) a)))))
(define (eval e a)
;;(debug "eval e=~a a=~a\n" e a)
;;(debug "eval (atom ~a)=~a\n" e (atom e))
;; (display 'mes-eval:)
;; (display e)
;; (newline)
;; (display 'a:)
;; (display a)
;; (newline)
;;(display 'pair?*macro*:)
;;(display (assoc '*macro* a))
;; (display (cdr (assoc '*macro* a)))
;; (newline)
(cond
;;((and (stderr "NUMBER? ~a ==> ~a\n" e (number e)) #f))
((number e) e)
((eq e #t) #t)
((eq e #f) #f)
((atom e) (cdr (assoc e a)))
((builtin e) e)
((atom (car e))
(cond
((eq (car e) 'quote) (cadr e))
((eq (car e) 'cond) (evcon (cdr e) a))
;; no macro support:
(#t (apply (car e) (evlis (cdr e) a) a))
;; ^^^^^^^^^^^^^^^^^
(#t
(cond
;; (#t
;; (display 'could-be-macro:)
;; (display e)
;; (newline)
;; (display 'null:)
;; (display (null (cdr (assoc '*macro* a))))
;; (newline)
;; #f)
;;(#t (apply (car e) (evlis (cdr e) a) a))
((eq (assoc '*macro* a) #f)
;;(null (cdr (assoc '*macro* a)))
;; (display 'we-have-no-macros:)
;; (display e)
;; (newline)
(apply (car e) (evlis (cdr e) a) a)
)
((pair (assoc (car e) (cdr (assoc '*macro* a))))
;; (display 'expanz0r:)
;; (display (assoc (car e) (cdr (assoc '*macro* a))))
;; (newline)
;; (display 'running:)
;; (display (cdr (assoc (car e) (cdr (assoc '*macro* a)))))
;; (newline)
;; (display 'args:)
;; (display (cdr e))
;; (newline)
;; (display '==>args:)
;; (display (evlis (cdr e) a))
;; (newline)
(eval (apply
(cdr (assoc (car e) (cdr (assoc '*macro* a))))
(evlis (cdr e) a)
a)
a))
(#t (apply (car e) (evlis (cdr e) a) a))))
(#t (apply (car e) (evlis (cdr e) a) a))))
(#t (apply (car e) (evlis (cdr e) a) a))))
(define (readenv a)
(readword (getchar) '() a))
(define (readword c w a)
;; (display 'readword:)
;; (display c)
;; (newline)
(cond ((eq c -1) ;; eof
(cond ((eq w '()) '())
(#t (lookup w a))))
((eq c 10) ;; \n
(cond ((eq w '()) (readword (getchar) w a))
(#t (lookup w a))))
((eq c 32) ;; \space
(readword 10 w a))
((eq c 40) ;; (
(cond ((eq w '()) (readlis a))
(#t (ungetchar c) (lookup w a))))
((eq c 41) ;; )
(cond ((eq w '()) (ungetchar c) w)
(#t (ungetchar c) (lookup w a))))
((eq c 39) ;; '
(cond ((eq w '())
(cons (lookup (cons c '()) a)
(cons (readword (getchar) w a) '())))
(#t (ungetchar c) (lookup w a))))
((eq c 59) ;; ;
(readcomment 59)
(readword 10 w a))
(#t (readword (getchar) (append w (cons c '())) a))))
(define (readlis a)
;; (display 'readlis:)
;; (newline)
(cond ((eq (peekchar) 41) ;; )
(getchar)
'())
(#t (xcons (readlis a) (readword (getchar) '() a)))))
(define (xcons a b)
(cons b a))
(define (readcomment c)
(cond ((eq c 10) ;; \n
c)
(#t (readcomment (getchar)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; we also add helpers to make loop2 simpler
(define (scm-define x a)
(cond ((atom (cadr x)) (cons (cadr x) (eval (caddr x) a)))
(#t (cons (caadr x) (cons 'lambda (cons (cdadr x) (cddr x)))))))
(define (scm-define-macro x a)
(cons '*macro*
(cons (cons (caadr e) (cons 'lambda (cons (cdadr e) (cddr e))))
(cdr (assoc '*macro* a)))))
(define (scm-display x)
(display x))
(define (loop2 r e a)
(display '____loop2)
(newline)
(display 'e:)
(display e)
;; (newline)
(cond ((null e) r)
((eq e 'EOF2)
(display 'loop2-exiting...)
(newline))
((eq (assoc '*macro* a) #f)
(loop2 r (readenv a) (cons (cons '*macro* '()) a)))
((atom e)
;; (display 'loop2:atom)
;; (newline)
;; (display 'skipping-one-read-scm:)
;; (display (readenv a))
;; (newline)
(loop2 (eval e a) (readenv a) a)
)
((eq (car e) 'define)
(loop2 *unspecified* (readenv a) (cons (scm-define e a) a)))
((eq (car e) 'define-macro)
(loop2 *unspecified* (readenv a) (cons (scm-define-macro e a) a)))
(#t (loop2 (eval e a) (readenv a) a))
;;(#t (loop2 ((cdr (assoc 'eval a)) e a) (readenv a) a))
))
;;(display 'loop:read-loop2-exiting...)
;;(newline)
;;;EOF
;; loop2 skips one read:
'this-is-skipped-scm
(display 123)
4
(newline)
(display 'hello-display-symbol)
(newline)
(display '(0 1 2))
(newline)
(display (- 12 3))
(newline)
(define (+ x y) (- x (- 0 y)))
(display (+ 3 4))
(newline)
;; (define-macro (and x y)
;; (cond (x
;; (display 'true-inside-and:)
;; (display x)
;; (newline)
;; y)
;; (#t
;; (display 'false-inside-and:)
;; (display x)
;; #f)))
;; (define-macro (and x y)
;; (cond (x y)
;; (#t #f)))
;; (define-macro (or x y)
;; (cond (x x)
;; (#t y)))
;; (display 'and-0-1:)
;; ;; ;;(display (and 0 1))
;; (and 0 1)
;; (and 0 2)
;; (and #f 3)
;; (newline)
;; (display 'xscm-display)
;; (newline)
;; ;; ;;(eval '(display (and 0 1)) '((*macro*)))
;; (display (and 0 1))
'()
EOF2
EOF

462
mes.c
View file

@ -57,7 +57,7 @@ typedef struct scm_t {
int value;
function0_t function0;
function1_t function1;
function2_t function2;
function2_t function2;
function3_t function3;
struct scm_t* cdr;
};
@ -69,17 +69,17 @@ scm scm_f = {ATOM, "#f"};
scm scm_lambda = {ATOM, "lambda"};
scm scm_label = {ATOM, "label"};
scm scm_unspecified = {ATOM, "*unspecified*"};
scm scm_define = {ATOM, "define"};
scm scm_macro = {ATOM, "*macro*"};
scm scm_symbol_cond = {ATOM, "cond"};
scm scm_symbol_quote = {ATOM, "quote"};
// PRIMITIVES
scm *
atom (scm *x)
atom_p (scm *x)
{
return x->type == PAIR ? &scm_f : &scm_t;
}
scm scm_atom = {FUNCTION1, .name="atom", .function1 = &atom};
scm scm_atom = {FUNCTION1, .name="atom", .function1 = &atom_p};
scm *
car (scm *x)
@ -112,10 +112,10 @@ eq_p (scm *x, scm *y)
|| (x->type == NUMBER && y->type == NUMBER
&& x->value == y->value)
// FIXME: alist lookup symbols
|| (atom (x) == &scm_t
|| (atom_p (x) == &scm_t
&& x->type != NUMBER
&& y->type != NUMBER
&& atom (y) == &scm_t
&& y->type != NUMBER
&& atom_p (y) == &scm_t
&& !strcmp (x->name, y->name)))
? &scm_t : &scm_f;
}
@ -143,39 +143,6 @@ quote (scm *x)
return cons (&scm_quote, x);
}
#if QUASIQUOTE
scm scm_unquote;
scm *
unquote (scm *x)
{
return cons (&scm_unquote, x);
}
scm scm_quasiquote;
scm *
quasiquote (scm *x)
{
return cons (&scm_quasiquote, x);
}
scm *eval_quasiquote (scm *, scm *);
#endif
//Primitives
scm scm_car = {FUNCTION1, "car", .function1 = &car};
scm scm_cdr = {FUNCTION1, "cdr", .function1 = &cdr};
scm scm_cons = {FUNCTION2, "cons", .function2 = &cons};
scm scm_cond = {FUNCTION2, "cond"}; //, .function2 = &cond};
scm scm_eq_p = {FUNCTION2, "eq", .function2 = &eq_p};
scm scm_null_p = {FUNCTION1, "null", .function1 = &null_p};
scm scm_pair_p = {FUNCTION1, "pair", .function1 = &pair_p};
scm scm_quote = {FUNCTION1, "quote", .function1 = &quote};
#if QUASIQUOTE
scm scm_unquote = {FUNCTION1, "unquote", .function1 = &unquote};
scm scm_quasiquote = {FUNCTION1, "quasiquote", .function1 = &quasiquote};
#endif
//Library functions
scm scm_read;
@ -218,10 +185,16 @@ list (scm *x, ...)
return lst;
}
// Page 12
scm *
pairlis (scm *x, scm *y, scm *a)
{
#if 0 //DEBUG
printf ("pairlis x=");
display (x);
printf (" y=");
display (y);
puts ("");
#endif
if (x == &scm_nil)
return a;
return cons (cons (car (x), car (y)),
@ -232,23 +205,21 @@ scm scm_pairlis = {FUNCTION3, .name="pairlis", .function3 = &pairlis};
scm *
assoc (scm *x, scm *a)
{
//printf ("assoc: %s\n" , x->name);
// not Page 12:
if (a == &scm_nil) {
#if DEBUG
printf ("alist miss: %s\n", x->name);
#endif
return &scm_f;
}
//
if (eq_p (caar (a), x) == &scm_t)
return car (a);
return assoc (x, cdr (a));
}
scm scm_assoc = {FUNCTION2, .name="assoc", .function2 = &assoc};
// Page 13
scm *apply (scm*, scm*, scm*);
scm *eval_ (scm*, scm*);
scm *apply_ (scm*, scm*, scm*);
scm *
eval_quote (scm *fn, scm *x)
@ -261,27 +232,22 @@ scm *call (scm *, scm*);
scm *display (scm*);
scm *newline ();
// .. continued Page 13
scm *
apply (scm *fn, scm *x, scm *a)
apply_ (scm *fn, scm *x, scm *a)
{
#if DEBUG
printf ("apply fn=");
display (fn);
printf (" x=");
display (x);
//printf (" x=");
//display (x);
puts ("");
#endif
if (atom (fn) != &scm_f)
if (atom_p (fn) != &scm_f)
{
if (builtin_p (fn) == &scm_t)
return call (fn, x);
return apply (eval (fn, a), x, a);
}
// Page 12: single statement lambda
// else if (car (fn) == &scm_lambda)
// return eval (caddr (fn), pairlis (cadr (fn), x, a));
// Multi-statement lambda
else if (car (fn) == &scm_lambda) {
scm *body = cddr (fn);
scm *ax = pairlis (cadr (fn), x, a);
@ -299,20 +265,11 @@ scm *evcon (scm*, scm*);
scm *evlis (scm*, scm*);
scm *
eval (scm *e, scm *a)
eval_ (scm *e, scm *a)
{
#if DEBUG
printf ("eval e=");
display (e);
// printf (" a=");
// display (a);
puts ("");
#endif
// not Page 12
if (e->type == NUMBER)
return e;
//
else if (atom (e) == &scm_t) {
else if (atom_p (e) == &scm_t) {
scm *y = assoc (e, a);
if (y == &scm_f) {
printf ("eval: no such symbol: %s\n", e->name);
@ -320,59 +277,14 @@ eval (scm *e, scm *a)
}
return cdr (y);
}
// not Page 12
if (builtin_p (e) == &scm_t)
return e;
//
else if (atom (car (e)) == &scm_t)
else if (atom_p (car (e)) == &scm_t)
{
scm *macro;
#if DEBUG
printf ("e:");
display (e);
puts ("");
scm *macros = cdr (assoc (&scm_macro, a));
if (pair_p (macros) == &scm_t) {
printf ("macros:");
display (macros);
puts ("");
}
#endif
if (car (e) == &scm_quote)
if (car (e) == &scm_symbol_quote)
return cadr (e);
#if QUASIQUOTE
else if (car (e) == &scm_unquote)
return eval (cadr (e), a);
else if (car (e) == &scm_quasiquote) {
#if DEBUG
printf ("cadr e:");
display (cadr (e));
puts ("");
printf ("qq:");
display (eval_quasiquote (cadr (e), a));
puts ("");
#endif
return eval_quasiquote (cadr (e), a);
}
#endif
else if (car (e) == &scm_cond)
else if (car (e) == &scm_symbol_cond)
return evcon (cdr (e), a);
//return cond (cdr (e), a);
else if ((macro = assoc (car (e), cdr (assoc (&scm_macro, a)))) != &scm_f) {
#if DEBUG
printf ("eval macro:");
display (cdr (macro));
puts ("");
printf ("macro evlis:");
display (evlis (cdr (e), a));
puts ("");
#endif
return eval (apply
(cdr (macro),
evlis (cdr (e), a),
a),
a);
}
else
return apply (car (e), evlis (cdr (e), a), a);
}
@ -380,18 +292,43 @@ eval (scm *e, scm *a)
}
scm *
evcon (scm *c, scm *a)
evcon_ (scm *c, scm *a)
{
// if (eval (caar (c), a) != &scm_f)
// return eval (cadar (c), a);
#if DEBUG
printf ("evcon_ clause=");
display (car (c));
puts ("");
#endif
if (eval (caar (c), a) != &scm_f) {
#if DEBUG
//if (fn != &scm_display && fn != &scm_call)
//if (fn != &scm_call)
printf ("#t clause=");
display (car (c));
printf (" cddar=");
display (cddar (c));
printf (" nil=%d", cddar (c) == &scm_nil);
puts ("");
#endif
if (cddar (c) == &scm_nil)
return eval (cadar (c), a);
eval (cadar (c), a);
return evcon (cons (cons (&scm_t, cddar (c)), &scm_nil), a);
return evcon_ (cons (cons (&scm_t, cddar (c)), &scm_nil), a);
}
return evcon (cdr (c), a);
return evcon_ (cdr (c), a);
}
scm *
evcon (scm *c, scm *a)
{
#if DEBUG
printf ("\n****evcon=");
display (c);
puts ("");
#endif
return evcon_ (c, a);
}
scm scm_evcon = {FUNCTION2, .name="evcon", .function2 = &evcon};
scm *
@ -403,7 +340,24 @@ evlis (scm *m, scm *a)
}
scm scm_evlis = {FUNCTION2, .name="evlis", .function2 = &evlis};
// EXTRAS
//Primitives
scm scm_car = {FUNCTION1, "car", .function1 = &car};
scm scm_cdr = {FUNCTION1, "cdr", .function1 = &cdr};
scm scm_cons = {FUNCTION2, "cons", .function2 = &cons};
scm scm_cond = {FUNCTION2, "cond", .function2 = &evcon};
scm scm_eq_p = {FUNCTION2, "eq", .function2 = &eq_p};
scm scm_null_p = {FUNCTION1, "null", .function1 = &null_p};
scm scm_pair_p = {FUNCTION1, "pair", .function1 = &pair_p};
scm scm_quote = {FUNCTION1, "quote", .function1 = &quote};
scm scm_eval = {FUNCTION2, .name="eval", .function2 = &eval};
scm scm_apply = {FUNCTION3, .name="apply", .function3 = &apply};
scm scm_apply_ = {FUNCTION3, .name="c:apply", .function3 = &apply_};
scm scm_eval_ = {FUNCTION2, .name="c:eval", .function2 = &eval_};
//Helpers
scm *
builtin_p (scm *x)
@ -423,13 +377,35 @@ number_p (scm *x)
}
scm scm_number_p = {FUNCTION1, .name="number", .function1 = &number_p};
scm *display_helper (scm*, bool, char*, bool);
scm *
display (scm *x)
{
return display_helper (x, false, "", false);
}
scm scm_display = {FUNCTION1, .name="display", .function1 = &display};
scm *call (scm*, scm*);
scm scm_call = {FUNCTION2, .name="call", .function2 = &call};
scm *
call (scm *fn, scm *x)
{
#if DEBUG
//if (fn != &scm_display && fn != &scm_call)
//if (fn != &scm_call)
{
printf ("\ncall fn=");
display (fn);
printf (" x=");
display (x);
puts ("");
}
#endif
if (fn->type == FUNCTION0)
return fn->function0 ();
else if (fn->type == FUNCTION1)
if (fn->type == FUNCTION1)
return fn->function1 (car (x));
if (fn->type == FUNCTION2)
return fn->function2 (car (x), cadr (x));
@ -437,7 +413,6 @@ call (scm *fn, scm *x)
return fn->function3 (car (x), cadr (x), caddr (x));
return &scm_unspecified;
}
scm scm_call = {FUNCTION1, .name="call", .function2 = &call};
scm *
append (scm *x, scm *y)
@ -473,29 +448,39 @@ lookup (char *x, scm *a)
{
if (isdigit (*x) || (*x == '-' && isdigit (*(x+1))))
return make_number (atoi (x));
if (x) {
scm *y = make_atom (x);
scm *r = assoc (y, a);
#if 0
if (!strcmp (x, "eval")) {
printf ("lookup %s ==> ", x);
display (r);
puts ("");
}
if (*x == '\'') return &scm_symbol_quote;
if (!strcmp (x, "apply")) {
printf ("lookup %s ==> ", x);
display (r);
puts ("");
}
#endif
if (r != &scm_f) return cdr (r);
return y;
}
if (!strcmp (x, scm_symbol_cond.name)) return &scm_symbol_cond;
if (!strcmp (x, scm_symbol_quote.name)) return &scm_symbol_quote;
if (!strcmp (x, scm_lambda.name)) return &scm_lambda;
if (!strcmp (x, scm_label.name)) return &scm_label;
if (!strcmp (x, scm_nil.name)) return &scm_nil;
return &scm_unspecified;
return make_atom (x);
}
char *
list2str (scm *l)
{
static char buf[256];
char *p = buf;
while (l != &scm_nil) {
scm *c = car (l);
assert (c->type == NUMBER);
*p++ = c->value;
l = cdr (l);
}
*p = 0;
return buf;
}
scm *
builtin_lookup (scm *l, scm *a)
{
return lookup (list2str (l), a);
}
scm scm_lookup = {FUNCTION2, .name="lookup", .function2 = &builtin_lookup};
scm *
cossa (scm *x, scm *a)
{
@ -505,15 +490,6 @@ cossa (scm *x, scm *a)
return cossa (x, cdr (a));
}
scm *display_helper (scm*, bool, char*, bool);
scm *
display (scm *x)
{
return display_helper (x, false, "", false);
}
scm scm_display = {FUNCTION1, .name="display", .function1 = &display};
scm *
newline ()
{
@ -526,7 +502,7 @@ scm *
display_helper (scm *x, bool cont, char *sep, bool quote)
{
scm *r;
printf (sep);
printf ("%s", sep);
if (x->type == NUMBER) printf ("%d", x->value);
else if (x->type == PAIR) {
#if QUOTE_SUGAR
@ -534,16 +510,6 @@ display_helper (scm *x, bool cont, char *sep, bool quote)
printf ("'");
return display_helper (car (cdr (x)), cont, "", true);
}
#if QUASIQUOTE
if (car (x) == &scm_quasiquote) {
printf ("`");
return display_helper (car (cdr (x)), cont, "", true);
}
if (car (x) == &scm_unquote) {
printf (",");
return display_helper (car (cdr (x)), cont, "", true);
}
#endif
#endif
if (!cont) printf ("(");
display (car (x));
@ -555,12 +521,13 @@ display_helper (scm *x, bool cont, char *sep, bool quote)
}
if (!cont) printf (")");
}
else if (atom (x) == &scm_t) printf (x->name);
else if (atom_p (x) == &scm_t) printf ("%s", x->name);
return &scm_unspecified;
}
// READ
int
ungetchar (int c)
{
@ -630,11 +597,9 @@ readword (int c, char* w, scm *a)
&scm_nil));}
if (c == ';') {readcomment (c); return readword ('\n', w, a);}
if (c == '#' && peekchar () == '!') {getchar (); readblock (getchar ()); return readword (getchar (), w, a);}
char s[2];
s[0] = c;
s[1] = 0;
char buf[256] = "";
return readword (getchar (), strcat (w ? w : buf, s), a);
char buf[256] = {0};
char ch = c;
return readword (getchar (), strncat (w ? w : buf, &ch, 1), a);
}
scm *
@ -651,13 +616,18 @@ readenv (scm *a)
{
return readword (getchar (), 0, a);
}
scm scm_readenv = {FUNCTION1, .function1 = &readenv};
scm scm_readenv = {FUNCTION1, .name="readenv", .function1 = &readenv};
// Extras to make interesting program
scm *
add_environment (scm *a, char *name, scm* x)
hello_world ()
{
return cons (cons (make_atom (name), x), a);
puts ("c: hello world");
return &scm_unspecified;
}
scm scm_hello_world = {FUNCTION0, .name="hello-world", .function0 = &hello_world};
scm *
less_p (scm *a, scm *b)
@ -670,37 +640,38 @@ less_p (scm *a, scm *b)
scm *
minus (scm *a, scm *b)
{
#if DEBUG
printf ("\nminus a=");
display (a);
printf (" b=");
display (b);
puts ("");
#endif
assert (a->type == NUMBER);
assert (b->type == NUMBER);
return make_number (a->value - b->value);
//return make_number (a->value - b->value);
scm *r = make_number (a->value - b->value);
#if DEBUG
printf (" ==> ");
display (r);
puts ("");
#endif
return r;
}
scm scm_less_p = {FUNCTION2, .name="<", .function2 = &less_p};
scm scm_minus = {FUNCTION2, .name="-", .function2 = &minus};
scm *global_environment;
scm *
apply_environment (scm *fn, scm *x, scm *a)
add_environment (scm *a, char *name, scm* x)
{
return apply (fn, x, append (a, global_environment));
return cons (cons (make_atom (name), x), a);
}
scm *
eval_environment (scm *e, scm *a)
{
return eval (e, append (a, global_environment));
}
//scm scm_cond = {FUNCTION2, .name="cond", .function2 = &evcon};
scm scm_eval = {FUNCTION2, .name="eval", .function2 = &eval_environment};
scm scm_apply = {FUNCTION3, .name="apply", .function3 = &apply_environment};
scm *
initial_environment ()
{
scm_cond.function2 = &evcon;
scm *a = &scm_nil;
a = add_environment (a, "()", &scm_nil);
@ -723,31 +694,31 @@ initial_environment ()
a = add_environment (a, "quote", &scm_quote);
a = add_environment (a, "'", &scm_quote);
#if QUASIQUOTE
a = add_environment (a, "quasiquote", &scm_quasiquote);
a = add_environment (a, "unquote", &scm_unquote);
a = add_environment (a, ",", &scm_unquote);
a = add_environment (a, "`", &scm_quasiquote);
#endif
a = add_environment (a, "evlis", &scm_evlis);
a = add_environment (a, "evcon", &scm_evcon);
a = add_environment (a, "pairlis", &scm_pairlis);
a = add_environment (a, "pairlis", &scm_pairlis);
a = add_environment (a, "assoc", &scm_assoc);
a = add_environment (a, "c:eval", &scm_eval_);
a = add_environment (a, "c:apply", &scm_apply_);
a = add_environment (a, "eval", &scm_eval);
a = add_environment (a, "apply", &scm_apply);
a = add_environment (a, "getchar", &scm_getchar);
a = add_environment (a, "peekchar", &scm_peekchar);
a = add_environment (a, "ungetchar", &scm_ungetchar);
a = add_environment (a, "lookup", &scm_lookup);
a = add_environment (a, "readenv", &scm_readenv);
a = add_environment (a, "display", &scm_display);
a = add_environment (a, "newline", &scm_newline);
a = add_environment (a, "newline", &scm_newline);
a = add_environment (a, "builtin", &scm_builtin_p);
a = add_environment (a, "number", &scm_number_p);
a = add_environment (a, "call", &scm_call);
a = add_environment (a, "define", &scm_define);
a = add_environment (a, "hello-world", &scm_hello_world);
a = add_environment (a, "<", &scm_less_p);
a = add_environment (a, "-", &scm_minus);
@ -765,30 +736,9 @@ initial_environment ()
a = add_environment (a, "append", &scm_append);
a = add_environment (a, "*macro*", &scm_nil);
// Hmm
//a = add_environment (a, "*a*", &scm_nil);
global_environment = add_environment (a, "*a*", a);
return a;
}
#if QUASIQUOTE
scm *
eval_quasiquote (scm *e, scm *a)
{
if (e == &scm_nil) return e;
else if (atom (e) == &scm_t) return e;
else if (car (e) == &scm_unquote)
return eval (cadr (e), a);
else if (car (e) == &scm_quote)
return cadr (e);
else if (car (e) == &scm_quasiquote)
return cadr (e);
return cons (car (e), eval_quasiquote (cdr (e), a));
}
#endif
scm *
define_lambda (scm *x, scm *a)
{
@ -798,37 +748,27 @@ define_lambda (scm *x, scm *a)
scm *
define (scm *x, scm *a)
{
if (atom (cadr (x)) != &scm_f)
if (atom_p (cadr (x)) != &scm_f)
return cons (cadr (x), eval (caddr (x), a));
return define_lambda (x, a);
}
scm *
define_macro (scm *x, scm *a)
{
return cons (&scm_macro,
cons (define_lambda (x, a),
cdr (assoc (&scm_macro, a))));
}
scm *
loop (scm *r, scm *e, scm *a)
{
//global_environment = add_environment (a, "*a*", a);
if (e == &scm_nil) return r; //a;
else if (eq_p (e, make_atom ("exit")) == &scm_t)
return apply (cdr (assoc (make_atom ("loop"), a)),
if (e == &scm_nil)
return r;
else if (eq_p (e, make_atom ("EOF")) == &scm_t)
return apply (cdr (assoc (make_atom ("loop2"), a)),
cons (&scm_unspecified, cons (&scm_t, cons (a, &scm_nil))), a);
else if (atom (e) == &scm_t)
else if (eq_p (e, make_atom ("EOF2")) == &scm_t)
return r;
else if (atom_p (e) == &scm_t)
return loop (eval (e, a), readenv (a), a);
else if (eq_p (car (e), make_atom ("define")) == &scm_t)
return loop (&scm_unspecified,
readenv (a),
cons (define (e, a), a));
else if (eq_p (car (e), make_atom ("define-macro")) == &scm_t)
return loop (&scm_unspecified,
readenv (a),
cons (define_macro (e, a), a));
return loop (eval (e, a), readenv (a), a);
}
@ -836,17 +776,45 @@ int
main (int argc, char *argv[])
{
scm *a = initial_environment ();
//global_environment = a;
scm *x = readenv (a);
#if DEBUG
printf ("program=");
display (x);
puts ("");
#endif
//display (eval (x, a));
display (loop (&scm_unspecified, x, a));
// loop (&scm_unspecified, x, a);
//loop (&scm_unspecified, read (), initial_environment ());
display (loop (&scm_unspecified, readenv (a), a));
newline ();
return 0;
}
scm *
apply (scm* fn, scm *x, scm *a)
{
#if DEBUG
printf ("\nc:apply fn=");
display (fn);
printf (" x=");
display (x);
puts ("");
#endif
if (fn == &scm_apply_)
return eval_ (x, a);
return apply_ (fn, x, a);
}
bool evalling_p = false;
scm *
eval (scm *e, scm *a)
{
#if DEBUG
printf ("\nc:eval e=");
display (e);
puts ("");
#endif
scm *eval__ = assoc (make_atom ("eval"), a);
assert (eval__ != &scm_f);
eval__ = cdr (eval__);
if (builtin_p (eval__) == &scm_t
|| evalling_p)
return eval_ (e, a);
evalling_p = true;
scm *r = apply (eval__, cons (e, cons (a, &scm_nil)), a);
evalling_p = false;
return r;
}

2
mes.test
View file

@ -4,6 +4,8 @@ echo 0 | $mes
echo 1 | $mes
#echo car | $mes "((0 1))"
echo "(car '(0 1))" | $mes
echo "(car (quote (0 1)))" | $mes
echo "(car '(0 1))" | $mes
#echo cdr | $mes "((0 1))"
echo "(cdr '(0 1))" | $mes
#echo cons | $mes "(0 1)"