652 lines
22 KiB
Scheme
652 lines
22 KiB
Scheme
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(library (ikarus lists)
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(export $memq list? list list* make-list append length list-ref reverse
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last-pair memq memv member assq assv assoc
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map for-each andmap ormap)
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(import
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(ikarus system $fx)
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(ikarus system $pairs)
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(except (ikarus) list? list list* make-list append reverse
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last-pair length list-ref memq memv member assq assv
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assoc map for-each andmap ormap))
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(define $memq
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(lambda (x ls)
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(let f ([x x] [ls ls])
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(and (pair? ls)
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(if (eq? x (car ls))
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ls
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(f x (cdr ls)))))))
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(define list (lambda x x))
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(define list*
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(lambda (fst . rest)
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(let f ([fst fst] [rest rest])
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(cond
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[(null? rest) fst]
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[else
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(cons fst (f ($car rest) ($cdr rest)))]))))
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(define list?
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(letrec ([race
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(lambda (h t)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(and (not (eq? h t))
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(race ($cdr h) ($cdr t)))
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(null? h)))
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(null? h)))])
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(lambda (x) (race x x))))
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(module (make-list)
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(define f
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(lambda (n fill ls)
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(cond
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[($fxzero? n) ls]
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[else
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(f ($fxsub1 n) fill (cons fill ls))])))
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(define make-list
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(case-lambda
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[(n)
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(if (and (fixnum? n) ($fx>= n 0))
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(f n (void) '())
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(error 'make-list "~s is not a valid length" n))]
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[(n fill)
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(if (and (fixnum? n) ($fx>= n 0))
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(f n fill '())
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(error 'make-list "~s is not a valid length" n))])))
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(define length
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(letrec ([race
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(lambda (h t ls n)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls ($fx+ n 2))
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(error 'length "circular list ~s" ls))
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(if (null? h)
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($fx+ n 1)
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(error 'length "~s is not a proper list" ls))))
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(if (null? h)
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n
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(error 'length "~s is not a proper list" ls))))])
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(lambda (ls)
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(race ls ls ls 0))))
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(define list-ref
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(lambda (list index)
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(define f
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(lambda (ls i)
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(cond
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[($fxzero? i)
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(if (pair? ls)
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($car ls)
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(error 'list-ref "index ~s is out of range for ~s" index list))]
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[(pair? ls)
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(f ($cdr ls) ($fxsub1 i))]
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[(null? ls)
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(error 'list-rec "index ~s is out of range for ~s" index list)]
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[else (error 'list-ref "~s is not a list" list)])))
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(unless (and (fixnum? index) ($fx>= index 0))
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(error 'list-ref "~s is not a valid index" index))
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(f list index)))
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(module (append)
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(define reverse
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(lambda (h t ls ac)
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(if (pair? h)
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(let ([h ($cdr h)] [a1 ($car h)])
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(if (pair? h)
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(if (not (eq? h t))
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(let ([a2 ($car h)])
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(reverse ($cdr h) ($cdr t) ls (cons a2 (cons a1 ac))))
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(error 'append "circular list ~s" ls))
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(if (null? h)
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(cons a1 ac)
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(error 'append "~s is not a proper list" ls))))
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(if (null? h)
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ac
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(error 'append "~s is not a proper list" ls)))))
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(define revcons
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(lambda (ls ac)
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(cond
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[(null? ls) ac]
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[else
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(revcons ($cdr ls) (cons ($car ls) ac))])))
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(define append1
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(lambda (ls ls*)
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(cond
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[(null? ls*) ls]
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[else
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(revcons (reverse ls ls ls '())
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(append1 ($car ls*) ($cdr ls*)))])))
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(define append
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(case-lambda
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[() '()]
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[(ls) ls]
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[(ls . ls*)
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(append1 ls ls*)])))
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(define reverse
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(letrec ([race
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(lambda (h t ls ac)
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(if (pair? h)
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(let ([h ($cdr h)] [ac (cons ($car h) ac)])
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(if (pair? h)
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls (cons ($car h) ac))
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(error 'reverse "~s is a circular list" ls))
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(if (null? h)
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ac
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(error 'reverse "~s is not a proper list" ls))))
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(if (null? h)
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ac
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(error 'reverse "~s is not a proper list" ls))))])
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(lambda (x)
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(race x x x '()))))
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(define last-pair
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(letrec ([race
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(lambda (h t ls last)
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(if (pair? h)
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(let ([h ($cdr h)] [last h])
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(if (pair? h)
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls h)
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(error 'last-pair "~s is a circular list" ls))
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last))
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last))])
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(lambda (x)
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(if (pair? x)
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(let ([d (cdr x)])
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(race d d x x))
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(error 'last-pair "~s is not a pair" x)))))
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(define memq
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(letrec ([race
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(lambda (h t ls x)
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(if (pair? h)
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(if (eq? ($car h) x)
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h
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eq? ($car h) x)
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h
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls x)
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(error 'memq "circular list ~s" ls)))
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(if (null? h)
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'#f
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(error 'memq "~s is not a proper list" ls)))))
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(if (null? h)
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'#f
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(error 'memq "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race ls ls ls x))))
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(define memv
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(letrec ([race
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(lambda (h t ls x)
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(if (pair? h)
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(if (eqv? ($car h) x)
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h
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eqv? ($car h) x)
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h
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls x)
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(error 'memv "circular list ~s" ls)))
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(if (null? h)
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'#f
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(error 'memv "~s is not a proper list" ls)))))
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(if (null? h)
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'#f
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(error 'memv "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race ls ls ls x))))
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(define member
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(letrec ([race
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(lambda (h t ls x)
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(if (pair? h)
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(if (equal? ($car h) x)
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h
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (equal? ($car h) x)
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h
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(if (not (eq? h t))
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(race ($cdr h) ($cdr t) ls x)
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(error 'member "circular list ~s" ls)))
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(if (null? h)
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'#f
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(error 'member "~s is not a proper list" ls)))))
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(if (null? h)
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'#f
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(error 'member "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race ls ls ls x))))
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(define assq
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(letrec ([race
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(lambda (x h t ls)
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(if (pair? h)
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(let ([a ($car h)] [h ($cdr h)])
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(if (pair? a)
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(if (eq? ($car a) x)
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a
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(if (pair? h)
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(if (not (eq? h t))
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(let ([a ($car h)])
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(if (pair? a)
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(if (eq? ($car a) x)
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a
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(race x ($cdr h) ($cdr t) ls))
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(error 'assq "malformed alist ~s"
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ls)))
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(error 'assq "circular list ~s" ls))
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(if (null? h)
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#f
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(error 'assq "~s is not a proper list" ls))))
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(error 'assq "malformed alist ~s" ls)))
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(if (null? h)
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#f
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(error 'assq "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race x ls ls ls))))
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(define assv
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(letrec ([race
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(lambda (x h t ls)
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(if (pair? h)
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(let ([a ($car h)] [h ($cdr h)])
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(if (pair? a)
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(if (eqv? ($car a) x)
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a
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(if (pair? h)
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(if (not (eq? h t))
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(let ([a ($car h)])
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(if (pair? a)
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(if (eqv? ($car a) x)
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a
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(race x ($cdr h) ($cdr t) ls))
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(error 'assv "malformed alist ~s"
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ls)))
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(error 'assv "circular list ~s" ls))
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(if (null? h)
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#f
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(error 'assv "~s is not a proper list" ls))))
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(error 'assv "malformed alist ~s" ls)))
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(if (null? h)
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#f
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(error 'assv "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race x ls ls ls))))
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(define assoc
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(letrec ([race
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(lambda (x h t ls)
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(if (pair? h)
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(let ([a ($car h)] [h ($cdr h)])
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(if (pair? a)
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(if (equal? ($car a) x)
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a
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(if (pair? h)
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(if (not (eq? h t))
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(let ([a ($car h)])
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(if (pair? a)
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(if (equal? ($car a) x)
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a
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(race x ($cdr h) ($cdr t) ls))
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(error 'assoc "malformed alist ~s"
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ls)))
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(error 'assoc "circular list ~s" ls))
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(if (null? h)
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#f
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(error 'assoc "~s is not a proper list" ls))))
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(error 'assoc "malformed alist ~s" ls)))
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(if (null? h)
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#f
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(error 'assoc "~s is not a proper list" ls))))])
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(lambda (x ls)
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(race x ls ls ls))))
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(module (map)
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(define who 'map)
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(define len
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(lambda (h t n)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eq? h t)
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(error who "circular list")
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(len ($cdr h) ($cdr t) ($fx+ n 2)))
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(if (null? h)
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($fxadd1 n)
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(error who "improper list"))))
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(if (null? h)
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n
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(error who "improper list")))))
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(define map1
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(lambda (f a d n)
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(cond
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[(pair? d)
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(if ($fxzero? n)
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(error who "list was altered!")
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(cons (f a)
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(map1 f ($car d) ($cdr d) ($fxsub1 n))))]
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[(null? d)
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(if ($fxzero? n)
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(cons (f a) '())
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(error who "list was altered"))]
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[else (error who "list was altered")])))
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(define map2
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(lambda (f a1 a2 d1 d2 n)
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(cond
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[(pair? d1)
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(cond
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[(pair? d2)
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(if ($fxzero? n)
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(error who "list was altered")
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(cons (f a1 a2)
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(map2 f
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($car d1) ($car d2)
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($cdr d1) ($cdr d2)
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($fxsub1 n))))]
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[else (error who "length mismatch")])]
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[(null? d1)
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(cond
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[(null? d2)
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(if ($fxzero? n)
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(cons (f a1 a2) '())
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(error who "list was altered"))]
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[else (error who "length mismatch")])]
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[else (error who "list was altered")])))
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(define cars
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(lambda (ls*)
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(cond
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[(null? ls*) '()]
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[else
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(let ([a (car ls*)])
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(cond
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[(pair? a)
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(cons (car a) (cars (cdr ls*)))]
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[else
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(error 'map "length mismatch")]))])))
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(define cdrs
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(lambda (ls*)
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(cond
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[(null? ls*) '()]
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[else
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(let ([a (car ls*)])
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(cond
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[(pair? a)
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(cons (cdr a) (cdrs (cdr ls*)))]
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[else
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(error 'map "length mismatch")]))])))
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(define mapm
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(lambda (f ls ls* n)
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(cond
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[(null? ls)
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(if (andmap null? ls*)
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(if (fxzero? n)
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'()
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(error 'map "lists were mutated during operation"))
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(error 'map "length mismatch"))]
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[(fxzero? n)
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(error 'map "lists were mutated during operation")]
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[else
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(cons
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(apply f (car ls) (cars ls*))
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(mapm f (cdr ls) (cdrs ls*) (fxsub1 n)))])))
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(define map
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(case-lambda
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[(f ls)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(let ([d ($cdr ls)])
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(map1 f ($car ls) d (len d d 0)))]
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[(null? ls) '()]
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[else (error who "improper list")])]
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[(f ls ls2)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(if (pair? ls2)
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(let ([d ($cdr ls)])
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(map2 f ($car ls) ($car ls2) d ($cdr ls2) (len d d 0)))
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(error who "length mismatch"))]
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[(null? ls)
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(if (null? ls2)
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'()
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(error who "length mismatch"))]
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[else (error who "not a list")])]
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[(f ls . ls*)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(let ([n (len ls ls 0)])
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(mapm f ls ls* n))]
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[(null? ls)
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(if (andmap null? ls*)
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'()
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(error who "length mismatch"))])])))
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(module (for-each)
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(define who 'for-each)
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(define len
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(lambda (h t n)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eq? h t)
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(error who "circular list")
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(len ($cdr h) ($cdr t) ($fx+ n 2)))
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(if (null? h)
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($fxadd1 n)
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(error who "improper list"))))
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(if (null? h)
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n
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(error who "improper list")))))
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(define for-each1
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(lambda (f a d n)
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(cond
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[(pair? d)
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(if ($fxzero? n)
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(error who "list was altered!")
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(begin
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(f a)
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(for-each1 f ($car d) ($cdr d) ($fxsub1 n))))]
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[(null? d)
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(if ($fxzero? n)
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(f a)
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(error who "list was altered"))]
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[else (error who "list was altered")])))
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(define for-each2
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(lambda (f a1 a2 d1 d2 n)
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(cond
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[(pair? d1)
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(cond
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[(pair? d2)
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(if ($fxzero? n)
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(error who "list was altered")
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(begin
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(f a1 a2)
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(for-each2 f
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($car d1) ($car d2)
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($cdr d1) ($cdr d2)
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($fxsub1 n))))]
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[else (error who "length mismatch")])]
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[(null? d1)
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(cond
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[(null? d2)
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(if ($fxzero? n)
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(f a1 a2)
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(error who "list was altered"))]
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[else (error who "length mismatch")])]
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[else (error who "list was altered")])))
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(define for-each
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(case-lambda
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[(f ls)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(let ([d ($cdr ls)])
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(for-each1 f ($car ls) d (len d d 0)))]
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[(null? ls) (void)]
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[else (error who "improper list")])]
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[(f ls ls2)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(if (pair? ls2)
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(let ([d ($cdr ls)])
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(for-each2 f
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($car ls) ($car ls2) d ($cdr ls2) (len d d 0)))
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(error who "length mismatch"))]
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[(null? ls)
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(if (null? ls2)
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(void)
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(error who "length mismatch"))]
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[else (error who "not a list")])]
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[_ (error who "vararg not supported yet")])))
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(module (andmap)
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(define who 'andmap)
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(define len
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(lambda (h t n)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eq? h t)
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(error who "circular list")
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(len ($cdr h) ($cdr t) ($fx+ n 2)))
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(if (null? h)
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($fxadd1 n)
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(error who "improper list"))))
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(if (null? h)
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n
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(error who "improper list")))))
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(define andmap1
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(lambda (f a d n)
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(cond
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[(pair? d)
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(if ($fxzero? n)
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(error who "list was altered!")
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(and (f a)
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(andmap1 f ($car d) ($cdr d) ($fxsub1 n))))]
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[(null? d)
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(if ($fxzero? n)
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(f a)
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(error who "list was altered"))]
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[else (error who "list was altered")])))
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(define andmap2
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(lambda (f a1 a2 d1 d2 n)
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(cond
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[(pair? d1)
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(cond
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[(pair? d2)
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(if ($fxzero? n)
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(error who "list was altered")
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(and
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(f a1 a2)
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(andmap2 f
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($car d1) ($car d2)
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($cdr d1) ($cdr d2)
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($fxsub1 n))))]
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[else (error who "length mismatch")])]
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[(null? d1)
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(cond
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[(null? d2)
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(if ($fxzero? n)
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(f a1 a2)
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(error who "list was altered"))]
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[else (error who "length mismatch")])]
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[else (error who "list was altered")])))
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(define andmap
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(case-lambda
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[(f ls)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(let ([d ($cdr ls)])
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(andmap1 f ($car ls) d (len d d 0)))]
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[(null? ls) #t]
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[else (error who "improper list")])]
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[(f ls ls2)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(if (pair? ls2)
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(let ([d ($cdr ls)])
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(andmap2 f
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($car ls) ($car ls2) d ($cdr ls2) (len d d 0)))
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(error who "length mismatch"))]
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[(null? ls)
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(if (null? ls2)
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#t
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(error who "length mismatch"))]
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[else (error who "not a list")])]
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[(f . ls*) (error who "vararg not supported yet in ~s" (length ls*))])))
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(module (ormap)
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(define who 'ormap)
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(define len
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(lambda (h t n)
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(if (pair? h)
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(let ([h ($cdr h)])
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(if (pair? h)
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(if (eq? h t)
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(error who "circular list")
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(len ($cdr h) ($cdr t) ($fx+ n 2)))
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(if (null? h)
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($fxadd1 n)
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(error who "improper list"))))
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(if (null? h)
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n
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(error who "improper list")))))
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(define ormap1
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(lambda (f a d n)
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(cond
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[(pair? d)
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(if ($fxzero? n)
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(error who "list was altered!")
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(or (f a)
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(ormap1 f ($car d) ($cdr d) ($fxsub1 n))))]
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[(null? d)
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(if ($fxzero? n)
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(f a)
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(error who "list was altered"))]
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[else (error who "list was altered")])))
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(define ormap
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(case-lambda
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[(f ls)
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(unless (procedure? f)
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(error who "~s is not a procedure" f))
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(cond
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[(pair? ls)
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(let ([d ($cdr ls)])
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(ormap1 f ($car ls) d (len d d 0)))]
|
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[(null? ls) #f]
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[else (error who "improper list")])]
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[_ (error who "vararg not supported yet")])))
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)
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