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WIP, not quite right with differentiating chars

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Justin Ethier 2017-08-15 19:02:47 -04:00
parent 61d242521b
commit 62a54a50d5
2 changed files with 30 additions and 19 deletions
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41
read.scm
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@ -701,6 +701,9 @@
(parse2 (open-input-file "test.scm")))
;(read-token (open-input-file "test.scm")))
TODO: getting there, but still not parsed correctly:
(eq? c #\))
;; Notes on writing a fast parser:
; - Interface to the user is (read). This needs to be fast
; - Could read input a line at a time, but then need to buffer in the port_type object
@ -732,17 +735,6 @@
(let ((token (read-token fp))) ;; TODO: this will be a C call
;(write `(token ,token))
(cond
;; Open paren, start read loop
((eq? token #\()
(let loop ((lis '())
(t (parse2 fp)))
(cond
((eof-object? t)
(error "missing closing parenthesis"))
((eq? t #\))
(reverse lis))
(else
(loop (cons t lis) (parse2 fp))))))
((vector? token)
(cond
((= (vector-length token) 2) ;; Special case: number
@ -752,7 +744,26 @@
(exact (string->number (vector-ref token 0) (vector-ref token 1)))
(inexact (string->number (vector-ref token 0) (vector-ref token 1)))))
((= (vector-length token) 1) ;; Special case: error
(error (vector-ref token 0)))
(cond
;; Open paren, start read loop
((eq? (vector-ref token 0) #\()
(let loop ((lis '())
(t (parse2 fp)))
(cond
((eof-object? t)
(error "missing closing parenthesis"))
((eq? t #\)) TODO: here and below, need to wait for the vectorized close?
(reverse lis))
(else
(loop (cons t lis) (parse2 fp))))))
((eq? (vector-ref token 0) #\')
(list 'quote (parse2 fp)))
((eq? (vector-ref token 0) #\`)
(list 'quasiquote (parse2 fp)))
((eq? (vector-ref token 0) #\,)
(list 'unquote (parse2 fp)))
(else
(error (vector-ref token 0)))))
(else
(let loop ((lis '())
(t (parse2 fp)))
@ -773,12 +784,6 @@
(apply bytevector (reverse lis)))
(else
(loop (cons t lis) (parse2 fp))))))
((eq? token #\')
(list 'quote (parse2 fp)))
((eq? token #\`)
(list 'quasiquote (parse2 fp)))
((eq? token #\,)
(list 'unquote (parse2 fp)))
((eq? token (string->symbol ",@"))
(list 'unquote-splicing (parse2 fp)))
((eq? token (string->symbol "#;"))

8
runtime.c
View file

@ -6106,7 +6106,13 @@ void Cyc_io_read_token(void *data, object cont, object port)
_read_whitespace(p);
} else if (c == '(' || c == ')' || c == '\'' || c == '`') {
if (p->tok_end) _read_return_atom(data, cont, p);
return_thread_runnable(data, obj_char2obj(c));
//return_thread_runnable(data, obj_char2obj(c));
// Encode within a vector so we can distinguish between these and chars such as #\(
make_empty_vector(vec);
vec.num_elements = 1;
vec.elements = (object *) alloca(sizeof(object) * vec.num_elements);
vec.elements[0] = obj_char2obj(c);
return_thread_runnable(data, &vec);
} else if (c == ',') {
if (p->tok_end) _read_return_atom(data, cont, p);