ikarus/src/ikarus.fixnums.ss

213 lines
5.8 KiB
Scheme

(library (ikarus fixnums)
(export fxzero? fxadd1 fxsub1 fxlognot fx+ fx- fx* fxquotient
fxremainder fxmodulo fxlogor fxlogand fxlogxor fxsll fxsra
fx= fx< fx<= fx> fx>= fixnum->string)
(import
(ikarus system $fx)
(ikarus system $chars)
(ikarus system $strings)
(except (ikarus) fxzero? fxadd1 fxsub1 fxlognot fx+ fx- fx*
fxquotient fxremainder fxmodulo fxlogor fxlogand
fxlogxor fxsll fxsra fx= fx< fx<= fx> fx>=
fixnum->string))
(define fxzero?
(lambda (x)
(cond
[(eq? x 0) #t]
[(fixnum? x) #f]
[else (error 'fxzero? "~s is not a fixnum" x)])))
(define fxadd1
(lambda (n)
(if (fixnum? n)
($fxadd1 n)
(error 'fxadd1 "~s is not a fixnum" n))))
(define fxsub1
(lambda (n)
(if (fixnum? n)
($fxsub1 n)
(error 'fxsub1 "~s is not a fixnum" n))))
(define fxlognot
(lambda (x)
(unless (fixnum? x)
(error 'fxlognot "~s is not a fixnum" x))
($fxlognot x)))
(define fx+
(lambda (x y)
(unless (fixnum? x)
(error 'fx+ "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx+ "~s is not a fixnum" y))
($fx+ x y)))
(define fx-
(lambda (x y)
(unless (fixnum? x)
(error 'fx- "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx- "~s is not a fixnum" y))
($fx- x y)))
(define fx*
(lambda (x y)
(unless (fixnum? x)
(error 'fx* "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx* "~s is not a fixnum" y))
($fx* x y)))
(define fx=
(lambda (x y)
(unless (fixnum? x)
(error 'fx= "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx= "~s is not a fixnum" y))
($fx= x y)))
(define fx<
(lambda (x y)
(unless (fixnum? x)
(error 'fx< "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx< "~s is not a fixnum" y))
($fx< x y)))
(define fx<=
(lambda (x y)
(unless (fixnum? x)
(error 'fx<= "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx<= "~s is not a fixnum" y))
($fx<= x y)))
(define fx>
(lambda (x y)
(unless (fixnum? x)
(error 'fx> "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx> "~s is not a fixnum" y))
($fx> x y)))
(define fx>=
(lambda (x y)
(unless (fixnum? x)
(error 'fx>= "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fx>= "~s is not a fixnum" y))
($fx>= x y)))
(define fxquotient
(lambda (x y)
(unless (fixnum? x)
(error 'fxquotient "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxquotient "~s is not a fixnum" y))
(when ($fxzero? y)
(error 'fxquotient "zero dividend ~s" y))
($fxquotient x y)))
(define fxremainder
(lambda (x y)
(unless (fixnum? x)
(error 'fxremainder "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxremainder "~s is not a fixnum" y))
(when ($fxzero? y)
(error 'fxremainder "zero dividend ~s" y))
(let ([q ($fxquotient x y)])
($fx- x ($fx* q y)))))
(define fxmodulo
(lambda (x y)
(unless (fixnum? x)
(error 'fxmodulo "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxmodulo "~s is not a fixnum" y))
(when ($fxzero? y)
(error 'fxmodulo "zero dividend ~s" y))
($fxmodulo x y)))
(define fxlogor
(lambda (x y)
(unless (fixnum? x)
(error 'fxlogor "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxlogor "~s is not a fixnum" y))
($fxlogor x y)))
(define fxlogxor
(lambda (x y)
(unless (fixnum? x)
(error 'fxlogxor "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxlogxor "~s is not a fixnum" y))
($fxlogxor x y)))
(define fxlogand
(lambda (x y)
(unless (fixnum? x)
(error 'fxlogand "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxlogand "~s is not a fixnum" y))
($fxlogand x y)))
(define fxsra
(lambda (x y)
(unless (fixnum? x)
(error 'fxsra "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxsra "~s is not a fixnum" y))
(unless ($fx>= y 0)
(error 'fxsra "negative shift not allowed, got ~s" y))
($fxsra x y)))
(define fxsll
(lambda (x y)
(unless (fixnum? x)
(error 'fxsll "~s is not a fixnum" x))
(unless (fixnum? y)
(error 'fxsll "~s is not a fixnum" y))
(unless ($fx>= y 0)
(error 'fxsll "negative shift not allowed, got ~s" y))
($fxsll x y)))
(module (fixnum->string)
(define f
(lambda (n i j)
(cond
[($fxzero? n)
(values (make-string i) j)]
[else
(let ([q ($fxquotient n 10)])
(call-with-values
(lambda () (f q ($fxadd1 i) j))
(lambda (str j)
(let ([r ($fx- n ($fx* q 10))])
(string-set! str j
($fixnum->char ($fx+ r ($char->fixnum #\0))))
(values str ($fxadd1 j))))))])))
(define fixnum->string
(lambda (x)
(unless (fixnum? x) (error 'fixnum->string "~s is not a fixnum" x))
(cond
[($fxzero? x) "0"]
[($fx> x 0)
(call-with-values
(lambda () (f x 0 0))
(lambda (str j) str))]
;;; FIXME: DON'T HARDCODE CONSTANTS
[($fx= x -536870912) "-536870912"]
[else
(call-with-values
(lambda () (f ($fx- 0 x) 1 1))
(lambda (str j)
($string-set! str 0 #\-)
str))]))))
)