ikarus/scheme/ikarus.strings.ss

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(library (ikarus strings)
(export string-length string-ref string-set! make-string string->list
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string-append substring string list->string uuid
string-copy string-for-each string-fill!
string=? string<? string<=? string>? string>=?)
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(import
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(ikarus system $strings)
(ikarus system $fx)
(ikarus system $chars)
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(ikarus system $bytevectors)
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(ikarus system $pairs)
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(except (ikarus) string-length string-ref string-set! make-string
string->list string-append substring string
list->string uuid string-copy string-for-each
string=? string<? string<=? string>? string>=?
string-fill!))
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(define string-length
(lambda (x)
(unless (string? x)
(error 'string-length "~s is not a string" x))
($string-length x)))
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(define (string-ref s i)
(unless (string? s)
(error 'string-ref "~s is not a string" s))
(unless (fixnum? i)
(error 'string-ref "~s is not a valid index" i))
(unless (and ($fx< i ($string-length s))
($fx<= 0 i))
(error 'string-ref "index ~s is out of range for ~s" i s))
(let ([c ($string-ref s i)])
(unless (char? c)
(error 'string-ref "BUG: got a non-char"))
c))
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(define string-set!
(lambda (s i c)
(unless (string? s)
(error 'string-set! "~s is not a string" s))
(unless (fixnum? i)
(error 'string-set! "~s is not a valid index" i))
(unless (and ($fx< i ($string-length s))
($fx>= i 0))
(error 'string-set! "index ~s is out of range for ~s" i s))
(unless (char? c)
(error 'string-set! "~s is not a character" c))
($string-set! s i c)))
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(define make-string
(let ()
(define fill!
(lambda (s i n c)
(cond
[($fx= i n) s]
[else
($string-set! s i c)
(fill! s ($fx+ i 1) n c)])))
(define make-string
(case-lambda
[(n)
(unless (and (fixnum? n) (fx>= n 0))
(error 'make-string "~s is not a valid length" n))
(fill! ($make-string n) 0 n (integer->char 0))]
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[(n c)
(unless (and (fixnum? n) (fx>= n 0))
(error 'make-string "~s is not a valid length" n))
(unless (char? c)
(error 'make-string "~s is not a character" c))
(fill! ($make-string n) 0 n c)]))
make-string))
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(define string
;;; FIXME: add case-lambda
(letrec ([length
(lambda (ls n)
(cond
[(null? ls) n]
[(char? ($car ls)) (length ($cdr ls) ($fx+ n 1))]
[else (error 'string "~s is not a character" ($car ls))]))]
[loop
(lambda (s ls i n)
(cond
[($fx= i n) s]
[else
($string-set! s i ($car ls))
(loop s ($cdr ls) ($fx+ i 1) n)]))])
(lambda ls
(let ([n (length ls 0)])
(let ([s (make-string n)])
(loop s ls 0 n))))))
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(module (substring)
(define fill
(lambda (s d si sj di)
(cond
[($fx= si sj) d]
[else
($string-set! d di ($string-ref s si))
(fill s d ($fxadd1 si) sj ($fxadd1 di))])))
(define substring
(lambda (s n m)
(unless (string? s)
(error 'substring "~s is not a string" s))
(let ([len ($string-length s)])
(unless (and (fixnum? n)
($fx>= n 0)
($fx< n len))
(error 'substring "~s is not a valid start index for ~s" n s))
(unless (and (fixnum? m)
($fx>= m 0)
($fx<= m len))
(error 'substring "~s is not a valid end index for ~s" m s))
(let ([len ($fx- m n)])
(if ($fx<= len 0)
""
(fill s ($make-string len) n m 0)))))))
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(define string-copy
(lambda (s)
(if (string? s)
(substring s 0 (string-length s))
(error 'string-copy "~s is not a string" s))))
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(module (string=?)
(define bstring=?
(lambda (s1 s2 i j)
(or ($fx= i j)
(and ($char= ($string-ref s1 i) ($string-ref s2 i))
(bstring=? s1 s2 ($fxadd1 i) j)))))
(define check-strings-and-return-false
(lambda (s*)
(cond
[(null? s*) #f]
[(string? ($car s*))
(check-strings-and-return-false ($cdr s*))]
[else (err ($car s*))])))
(define strings=?
(lambda (s s* n)
(or (null? s*)
(let ([a ($car s*)])
(unless (string? a)
(error 'string=? "~s is not a string" a))
(if ($fx= n ($string-length a))
(and (strings=? s ($cdr s*) n)
(bstring=? s a 0 n))
(check-strings-and-return-false ($cdr s*)))))))
(define (err x)
(error 'string=? "~s is not a string" x))
(define string=?
(case-lambda
[(s s1)
(if (string? s)
(if (string? s1)
(let ([n ($string-length s)])
(and ($fx= n ($string-length s1))
(bstring=? s s1 0 n)))
(err s1))
(err s))]
[(s . s*)
(if (string? s)
(strings=? s s* ($string-length s))
(err s))])))
(define string-cmp
(lambda (who cmp s1 s*)
(if (string? s1)
(let f ([s1 s1] [s* s*])
(cond
[(null? s*) #t]
[else
(let ([s2 (car s*)])
(if (string? s2)
(if (cmp s1 s2)
(f s2 (cdr s*))
(let f ([s* (cdr s*)])
(cond
[(null? s*) #f]
[(string? (car s*))
(f (cdr s*))]
[else
(error who "~s is not a string"
(car s*))]))))
(error who "~s is not a string" s2))])))
(error who "~s is not a string" s1)))
(define ($string<? s1 s2)
(let ([n1 ($string-length s1)]
[n2 ($string-length s2)])
(if ($fx< n1 n2)
(let f ([i 0] [n n1] [s1 s1] [s2 s2])
(if ($fx= i n)
#t
(let ([c1 ($string-ref s1 i)]
[c2 ($string-ref s2 i)])
(if ($char< c1 c2)
#t
(if ($char= c1 c2)
(f ($fxadd1 i) n s1 s2)
#f)))))
(let f ([i 0] [n n2] [s1 s1] [s2 s2])
(if ($fx= i n)
#f
(let ([c1 ($string-ref s1 i)]
[c2 ($string-ref s2 i)])
(if ($char< c1 c2)
#t
(if ($char= c1 c2)
(f ($fxadd1 i) n s1 s2)
#f))))))))
(define ($string<=? s1 s2)
(let ([n1 ($string-length s1)]
[n2 ($string-length s2)])
(if ($fx<= n1 n2)
(let f ([i 0] [n n1] [s1 s1] [s2 s2])
(if ($fx= i n)
#t
(let ([c1 ($string-ref s1 i)]
[c2 ($string-ref s2 i)])
(if ($char< c1 c2)
#t
(if ($char= c1 c2)
(f ($fxadd1 i) n s1 s2)
#f)))))
(let f ([i 0] [n n2] [s1 s1] [s2 s2])
(if ($fx= i n)
#f
(let ([c1 ($string-ref s1 i)]
[c2 ($string-ref s2 i)])
(if ($char< c1 c2)
#t
(if ($char= c1 c2)
(f ($fxadd1 i) n s1 s2)
#f))))))))
(define ($string>? s1 s2)
($string<? s2 s1))
(define ($string>=? s1 s2)
($string<=? s2 s1))
(define string<?
(case-lambda
[(s1 s2)
(if (string? s1)
(if (string? s2)
($string<? s1 s2)
(error 'string<? "~s is not a string" s2))
(error 'string<? "~s is not a string" s2))]
[(s . s*)
(string-cmp 'string<? $string<? s s*)]))
(define string<=?
(case-lambda
[(s1 s2)
(if (string? s1)
(if (string? s2)
($string<=? s1 s2)
(error 'string<=? "~s is not a string" s2))
(error 'string<=? "~s is not a string" s2))]
[(s . s*)
(string-cmp 'string<=? $string<=? s s*)]))
(define string>?
(case-lambda
[(s1 s2)
(if (string? s1)
(if (string? s2)
($string>? s1 s2)
(error 'string>? "~s is not a string" s2))
(error 'string>? "~s is not a string" s2))]
[(s . s*)
(string-cmp 'string>? $string>? s s*)]))
(define string>=?
(case-lambda
[(s1 s2)
(if (string? s1)
(if (string? s2)
($string>=? s1 s2)
(error 'string>=? "~s is not a string" s2))
(error 'string>=? "~s is not a string" s2))]
[(s . s*)
(string-cmp 'string>=? $string>=? s s*)]))
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(define string->list
(lambda (x)
(unless (string? x)
(error 'string->list "~s is not a string" x))
(let f ([x x] [i ($string-length x)] [ac '()])
(cond
[($fxzero? i) ac]
[else
(let ([i ($fxsub1 i)])
(f x i (cons ($string-ref x i) ac)))]))))
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(define list->string
(letrec ([race
(lambda (h t ls n)
(if (pair? h)
(let ([h ($cdr h)])
(if (pair? h)
(if (not (eq? h t))
(race ($cdr h) ($cdr t) ls ($fx+ n 2))
(error 'reverse "circular list ~s" ls))
(if (null? h)
($fx+ n 1)
(error 'reverse "~s is not a proper list" ls))))
(if (null? h)
n
(error 'reverse "~s is not a proper list" ls))))]
[fill
(lambda (s i ls)
(cond
[(null? ls) s]
[else
(let ([c ($car ls)])
(unless (char? c)
(error 'list->string "~s is not a character" c))
($string-set! s i c)
(fill s ($fxadd1 i) (cdr ls)))]))])
(lambda (ls)
(let ([n (race ls ls ls 0)])
(let ([s ($make-string n)])
(fill s 0 ls))))))
(module (string-append)
;; FIXME: make nonconsing on 0,1,2, and 3 args
(define length*
(lambda (s* n)
(cond
[(null? s*) n]
[else
(let ([a ($car s*)])
(unless (string? a)
(error 'string-append "~s is not a string" a))
(length* ($cdr s*) ($fx+ n ($string-length a))))])))
(define fill-string
(lambda (s a si sj ai)
(unless ($fx= si sj)
($string-set! s si ($string-ref a ai))
(fill-string s a ($fxadd1 si) sj ($fxadd1 ai)))))
(define fill-strings
(lambda (s s* i)
(cond
[(null? s*) s]
[else
(let ([a ($car s*)])
(let ([n ($string-length a)])
(let ([j ($fx+ i n)])
(fill-string s a i j 0)
(fill-strings s ($cdr s*) j))))])))
(define string-append
(lambda s*
(let ([n (length* s* 0)])
(let ([s ($make-string n)])
(fill-strings s s* 0))))))
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(module (string-for-each)
(define who 'string-for-each)
(define string-for-each
(case-lambda
[(p v)
(unless (procedure? p)
(error who "~s is not a procedure" p))
(unless (string? v)
(error who "~s is not a string" v))
(let f ([p p] [v v] [i 0] [n (string-length v)])
(cond
[($fx= i n) (void)]
[else
(p (string-ref v i))
(f p v ($fxadd1 i) n)]))]
[(p v0 v1)
(unless (procedure? p)
(error who "~s is not a procedure" p))
(unless (string? v0)
(error who "~s is not a string" v0))
(unless (string? v1)
(error who "~s is not a string" v1))
(let ([n (string-length v0)])
(unless ($fx= n ($string-length v1))
(error who "length mismatch between ~s and ~s" v0 v1))
(let f ([p p] [v0 v0] [v1 v1] [i 0] [n n])
(cond
[($fx= i n) (void)]
[else
(p ($string-ref v0 i) ($string-ref v1 i))
(f p v0 v1 ($fxadd1 i) n)])))]
[(p v0 v1 . v*)
(unless (procedure? p)
(error who "~s is not a procedure" p))
(unless (string? v0)
(error who "~s is not a string" v0))
(unless (string? v1)
(error who "~s is not a string" v1))
(let ([n (string-length v0)])
(unless ($fx= n ($string-length v1))
(error who "length mismatch between ~s and ~s" v0 v1))
(let f ([v* v*] [n n])
(unless (null? v*)
(let ([a ($car v*)])
(unless (string? a)
(error who "~s is not a string" a))
(unless ($fx= ($string-length a) n)
(error who "length mismatch")))
(f ($cdr v*) n)))
(let f ([p p] [v0 v0] [v1 v1] [v* v*] [i 0] [n n])
(cond
[($fx= i n) (void)]
[else
(apply p ($string-ref v0 i) ($string-ref v1 i)
(let f ([i i] [v* v*])
(if (null? v*)
'()
(cons ($string-ref ($car v*) i)
(f i ($cdr v*))))))
(f p v0 v1 v* ($fxadd1 i) n)])))])))
(define (string-fill! v fill)
(unless (string? v)
(error 'string-fill! "~s is not a vector" v))
(unless (char? fill)
(error 'string-fill! "~s is not a character" fill))
(let f ([v v] [i 0] [n ($string-length v)] [fill fill])
(unless ($fx= i n)
($string-set! v i fill)
(f v ($fxadd1 i) n fill))))
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(define uuid
(lambda ()
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(let ([s ($make-bytevector 16)])
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(utf8->string
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(or (foreign-call "ik_uuid" s)
(error 'uuid "failed!"))))))
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)