ikarus/scheme/ikarus.strings.ss

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;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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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>=?
string-copy!)
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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 $pairs)
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(except (ikarus) string-length string-ref string-set! make-string
string->list string-append substring string
list->string uuid string-copy string-for-each
string=? string<? string<=? string>? string>=?
string-fill! string-copy!))
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(define string-length
(lambda (x)
(unless (string? x)
(die 'string-length "not a string" x))
($string-length x)))
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(define (string-ref s i)
(unless (string? s)
(die 'string-ref "not a string" s))
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(unless (fixnum? i)
(die 'string-ref "not a valid index" i))
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(unless (and ($fx< i ($string-length s))
($fx<= 0 i))
(die 'string-ref "index is out of range" i s))
(let ([c ($string-ref s i)])
(unless (char? c)
(die 'string-ref "BUG: got a non-char"))
c))
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(define string-set!
(lambda (s i c)
(unless (string? s)
(die 'string-set! "not a string" s))
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(unless (fixnum? i)
(die 'string-set! "not a valid index" i))
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(unless (and ($fx< i ($string-length s))
($fx>= i 0))
(die 'string-set! "index is out of range" i s))
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(unless (char? c)
(die 'string-set! "not a character" c))
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($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 ($fx+ i 1) n c)])))
(define make-string
(case-lambda
[(n)
(unless (and (fixnum? n) (fx>= n 0))
(die 'make-string "not a valid length" n))
(fill! ($make-string n) 0 n (integer->char 0))]
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[(n c)
(unless (and (fixnum? n) (fx>= n 0))
(die 'make-string "not a valid length" n))
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(unless (char? c)
(die 'make-string "not a character" c))
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(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 (die 'string "not a character" ($car ls))]))]
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[loop
(lambda (s ls i n)
(cond
[($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 ($fxadd1 di))])))
(define substring
(lambda (s n m)
(unless (string? s)
(die 'substring "not a string" s))
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(let ([len ($string-length s)])
(unless (and (fixnum? n)
($fx>= n 0)
($fx<= n len))
(die 'substring "not a valid start index" n s))
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(unless (and (fixnum? m)
($fx>= m 0)
($fx<= m len))
(die 'substring "not a valid end index" m s))
(unless ($fx<= n m)
(die 'substring "indices are in decreasing order" n m))
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(let ([len ($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))
(die 'string-copy "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 ($car s*)])
(unless (string? a)
(die 'string=? "not a string" a))
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(if ($fx= n ($string-length a))
(and (strings=? s ($cdr s*) n)
(bstring=? s a 0 n))
(check-strings-and-return-false ($cdr s*)))))))
(define (err x)
(die 'string=? "not a string" x))
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(define string=?
(case-lambda
[(s s1)
(if (string? s)
(if (string? s1)
(let ([n ($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* ($string-length s))
(err s))])))
(define string-cmp
(lambda (who cmp s1 s*)
(if (string? s1)
(let f ([s1 s1] [s* s*])
(cond
[(null? s*) #t]
[else
(let ([s2 (car s*)])
(if (string? s2)
(if (cmp s1 s2)
(f s2 (cdr s*))
(let f ([s* (cdr s*)])
(cond
[(null? s*) #f]
[(string? (car s*))
(f (cdr s*))]
[else
(die who "not a string"
(car s*))])))
(die who "not a string" s2)))]))
(die who "not a string0" s1))))
(define ($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)
(die 'string<? "not a string" s2))
(die 'string<? "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)
(die 'string<=? "not a string" s2))
(die 'string<=? "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)
(die 'string>? "not a string" s2))
(die 'string>? "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)
(die 'string>=? "not a string" s2))
(die 'string>=? "not a string" s2))]
[(s . s*)
(string-cmp 'string>=? $string>=? s s*)]))
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(define string->list
(lambda (x)
(unless (string? x)
(die 'string->list "not a string" x))
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(let f ([x x] [i ($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 ($fx+ n 2))
(die 'reverse "circular list" ls))
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(if (null? h)
($fx+ n 1)
(die 'reverse "not a proper list" ls))))
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(if (null? h)
n
(die 'reverse "not a proper list" ls))))]
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[fill
(lambda (s i ls)
(cond
[(null? ls) s]
[else
(let ([c ($car ls)])
(unless (char? c)
(die 'list->string "not a character" c))
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($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 ($car s*)])
(unless (string? a)
(die 'string-append "not a string" a))
(length* ($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)
(die who "not a procedure" p))
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(unless (string? v)
(die who "not a string" v))
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(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)
(die who "not a procedure" p))
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(unless (string? v0)
(die who "not a string" v0))
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(unless (string? v1)
(die who "not a string" v1))
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(let ([n (string-length v0)])
(unless ($fx= n ($string-length v1))
(die who "length mismatch" v0 v1))
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(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)
(die who "not a procedure" p))
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(unless (string? v0)
(die who "not a string" v0))
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(unless (string? v1)
(die who "not a string" v1))
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(let ([n (string-length v0)])
(unless ($fx= n ($string-length v1))
(die who "length mismatch" v0 v1))
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(let f ([v* v*] [n n])
(unless (null? v*)
(let ([a ($car v*)])
(unless (string? a)
(die who "not a string" a))
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(unless ($fx= ($string-length a) n)
(die who "length mismatch")))
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(f ($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* ($fxadd1 i) n)])))])))
(define (string-fill! v fill)
(unless (string? v)
(die 'string-fill! "not a vector" v))
(unless (char? fill)
(die 'string-fill! "not a character" fill))
(let f ([v v] [i 0] [n ($string-length v)] [fill fill])
(unless ($fx= i n)
($string-set! v i fill)
(f v ($fxadd1 i) n fill))))
(define string-copy!
(lambda (src src-start dst dst-start k)
(cond
[(or (not (fixnum? src-start)) ($fx< src-start 0))
(die 'string-copy! "not a valid starting index" src-start)]
[(or (not (fixnum? dst-start)) ($fx< dst-start 0))
(die 'string-copy! "not a valid starting index" dst-start)]
[(or (not (fixnum? k)) ($fx< k 0))
(die 'string-copy! "not a valid length" k)]
[(not (string? src))
(die 'string-copy! "not a string" src)]
[(not (string? dst))
(die 'string-copy! "not a string" dst)]
[(let ([n ($fx+ src-start k)])
(or ($fx< n 0) ($fx> n ($string-length src))))
(die 'string-copy! "out of range" src-start k)]
[(let ([n ($fx+ dst-start k)])
(or ($fx< n 0) ($fx> n ($string-length dst))))
(die 'string-copy! "out of range" dst-start k)]
[(eq? src dst)
(cond
[($fx< dst-start src-start)
(let f ([src src] [si src-start] [di dst-start] [sj ($fx+ src-start k)])
(unless ($fx= si sj)
($string-set! src di ($string-ref src si))
(f src ($fxadd1 si) ($fxadd1 di) sj)))]
[($fx< src-start dst-start)
(let f ([src src] [si ($fx+ src-start k)] [di ($fx+ dst-start k)] [sj src-start])
(unless ($fx= si sj)
(let ([si ($fxsub1 si)] [di ($fxsub1 di)])
($string-set! src di ($string-ref src si))
(f src si di sj))))]
[else (void)])]
[else
(let f ([src src] [si src-start] [dst dst] [di dst-start] [sj ($fx+ src-start k)])
(unless ($fx= si sj)
($string-set! dst di ($string-ref src si))
(f src ($fxadd1 si) dst ($fxadd1 di) sj)))])))
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(define uuid
(lambda ()
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(let ([s ($make-bytevector 16)])
(let ([r (foreign-call "ik_uuid" s)])
(if (bytevector? r)
(utf8->string r)
(error 'uuid "cannot obtain unique id"))))))
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)