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; Part of Scheme 48 1.9. See file COPYING for notices and license.
; Authors: Richard Kelsey, Jonathan Rees, Mike Sperber
; Tiny image and simple I/O test system
(define (start arg in in-encoding out out-encoding error-out error-out-encoding resumer-records)
(letrec ((fib (lambda (n)
(if (< n 2)
1
(+ (fib (- n 1))
(fib (- n 2) ))))))
(fib 32)
0)
(write-string "Hello " out)
(write-string (read-string in) out)
(newline out)
(if (vector? arg)
(if (< 0 (vector-length arg))
(write-byte-vector (vector-ref arg 0) out)))
(newline out)
(let ((c #f))
(foo (lambda ()
(if (call-with-current-continuation (lambda (cc)
(set! c cc)
10))
'a
'b)))
(collect)
(collect)
(symbol-check in out)
(collect)
(if c 1 2)
(write-image "test.image" start "Hello?" error-out)
0))
(define (foo thunk)
(+ (begin (thunk) 1)
2))
(define (wrapper thunk out)
(call-with-current-continuation
(lambda (c)
(write-string "[in]" out)
(newline out)
(call-with-values
(let ((x thunk)) (set! thunk #f) x)
(lambda results
(write-string "[out with " out)
(display-list results out)
(write-string "]" out)
(newline out)
(apply values results))))))
(define (display-list c out)
(if (eq? c '())
(write-string "()" out)
(begin
(write-string "(" out)
(write-string (symbol->string (car c)) out)
(let loop ((c (cdr c)))
(if (eq? c '())
(write-string ")" out)
(begin
(write-string " " out)
(write-string (symbol->string (car c)) out)
(loop (cdr c))))))))
(define (call-with-current-continuation proc)
(primitive-cwcc
(lambda (cont)
(proc (continuation->procedure cont)))))
(define (primitive-cwcc p)
(primitive-catch (lambda (cont)
(p (loophole :escape cont))))) ;?
(define (continuation->procedure cont)
(lambda results
(with-continuation cont
(lambda ()
(apply values results)))))
(define *the-symbols* '())
(define (lookup s)
(let loop ((syms *the-symbols*))
(cond ((eq? syms '())
(set! *the-symbols*
(cons (lookup-shared-binding s #f)
*the-symbols*))
#f)
((string=? s (shared-binding-name (car syms)))
(car syms))
(else
(loop (cdr syms))))))
(define (symbol-check in out)
(let loop ()
(write-string "> " out)
(let ((s (read-string in)))
(if (< 0 (string-length s))
(let ((sym (lookup s)))
(write-string (if sym
(if (eq? sym (lookup-shared-binding s #f))
"[old, eq]"
"[old, not eq]")
"[new]")
out)
(newline out)
(loop))))))
(define (write-string string . channel-option) ; test n-ary procedures
(write-byte-vector (string->byte-vector string)
(car channel-option)))
(define (write-byte-vector bytes channel)
(channel-maybe-write channel
bytes
0
(byte-vector-length bytes)))
(define (string->byte-vector string)
(let* ((size (string-length string))
(bytes (make-byte-vector size 0)))
(do ((i 0 (+ 1 i)))
((>= i size))
(byte-vector-set! bytes i (char->scalar-value (string-ref string i))))
bytes))
(define (string->low-string string)
(let* ((size (string-length string))
(bytes (make-byte-vector (+ 1 size) 0)))
(do ((i 0 (+ 1 i)))
((>= i size))
(byte-vector-set! bytes i (char->scalar-value (string-ref string i))))
bytes))
(define (newline channel)
(write-string "
" channel))
(define (read-string in)
((lambda (buffer)
(letrec ((loop (lambda (have)
((lambda (got)
(if (eq? got (eof-object))
"eof"
((lambda (len)
(if len
((lambda (string)
(copy-bytes-to-string! buffer string len)
string)
(make-string len #\space))
(loop (+ have got))))
(has-newline buffer have got))))
(channel-maybe-read in buffer have (- 80 have) #f)))))
(loop 0)))
(make-byte-vector 80 (char->scalar-value #\space))))
(define (has-newline bytes start count)
(letrec ((loop (lambda (i)
(if (= i count)
#f
(if (char=? #\newline
(scalar-value->char
(byte-vector-ref bytes (+ start i))))
(+ start i)
(loop (+ i 1)))))))
(loop 0)))
(define (copy-bytes-to-string! from to count)
(letrec ((loop (lambda (i)
(if (< i count)
(begin
(string-set! to i
(scalar-value->char (byte-vector-ref from i)))
(loop (+ i 1)))))))
(loop 0)))
;----------------
(define (write-image filename start-procedure message error-out)
(let ((undumpable (make-vector 1000 #f)))
(write-image-low (string->low-string filename)
start-procedure (string->low-string message)
undumpable)
(if (vector-ref undumpable 0)
(begin
(write-string "undumpable records written in image:" error-out)
(display-list (vector-prefix->list undumpable) error-out)
(newline error-out)))))
; Return a list containing the non-#F values at the beginning of VECTOR.
(define (vector-prefix->list vector)
(do ((i 0 (+ i 1))
(losers '() (cons (vector-ref vector i) losers)))
((or (= i (vector-length vector))
(if (vector-ref vector i) #f #t))
losers)))
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