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reader: handle whitespace and comments inside lists.

This commit is contained in:
Jan Nieuwenhuizen 2016-07-09 18:56:59 +02:00
parent 59bd723a8d
commit 6d5811bb98
2 changed files with 37 additions and 6 deletions
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10
mes.c
View File

@ -711,10 +711,20 @@ readword (int c, char* w, scm *a)
return readword (getchar (), strncat (w ? w : buf, &ch, 1), a);
}
int
eat_whitespace (int c)
{
while (c == ' ' || c == '\n') c = getchar ();
if (c == ';') return eat_whitespace (readcomment (c));
if (c == '#' && peekchar () == '!') {getchar (); readblock (getchar ()); return eat_whitespace (getchar ());}
return c;
}
scm *
readlis (scm *a)
{
int c = getchar ();
c = eat_whitespace (c);
if (c == ')') return &scm_nil;
scm *w = readword (c, 0, a);
if (w == &scm_dot)

33
mes.mes
View File

@ -156,9 +156,9 @@
(readword (getchar) '() a))
(define (readword c w a)
(display 'mes-readword:)
(display c)
(newline)
;; (display 'mes-readword:)
;; (display c)
;; (newline)
(cond ((eq c -1) ;; eof
(cond ((eq w '()) '())
(#t (lookup w a))))
@ -180,13 +180,34 @@
(cons (readword (getchar) w a) '())))
(#t (ungetchar c) (lookup w a))))
((eq c 59) ;; ;
(readcomment 59)
(readcomment c)
(readword 10 w a))
((eq c 35) ;; #
(cond ((eq (peekchar) 33) ;; !
(getchar)
(readblock (getchar))
(readword 10 w a))
(#t (readword (getchar) (append w (cons c '())) a))))
(#t (readword (getchar) (append w (cons c '())) a))))
(define (readblock c)
;; (display 'mes-readblock:)
;; (display c)
;; (newline)
(cond ((eq c 33) (cond ((eq (peekchar) 35) (getchar))
(#t (readblock (getchar)))))
(#t (readblock (getchar)))))
(define (eat-whitespace)
(cond ((eq (peekchar) 10) (getchar) (eat-whitespace))
((eq (peekchar) 32) (getchar) (eat-whitespace))
((eq (peekchar) 35) (getchar) (eat-whitespace))
(#t #t)))
(define (readlis a)
(display 'mes-readlis:)
(newline)
;; (display 'mes-readlis:)
;; (newline)
(eat-whitespace)
(cond ((eq (peekchar) 41) ;; )
(getchar)
'())