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(string-any, string-every): Use a scheme

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wrapper around the C code so for the final call to the predicate
procedure is a tail call, per SRFI-13 spec.
This commit is contained in:
Kevin Ryde 2004-12-14 00:21:25 +00:00
parent 680b523714
commit fdc6aebfaf
2 changed files with 30 additions and 2 deletions
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28
ice-9/boot-9.scm
View file

@ -51,6 +51,34 @@
(define format simple-format)
;; this is scheme wrapping the C code so the final pred call is a tail call,
;; per SRFI-13 spec
(define (string-any char_pred s . rest)
(let ((start (if (null? rest)
0 (car rest)))
(end (if (or (null? rest) (null? (cdr rest)))
(string-length s) (cadr rest))))
(if (and (procedure? char_pred)
(> end start)
(<= end (string-length s))) ;; let c-code handle range error
(or (string-any-c-code char_pred s start (1- end))
(char_pred (string-ref s (1- end))))
(string-any-c-code char_pred s start end))))
;; this is scheme wrapping the C code so the final pred call is a tail call,
;; per SRFI-13 spec
(define (string-every char_pred s . rest)
(let ((start (if (null? rest)
0 (car rest)))
(end (if (or (null? rest) (null? (cdr rest)))
(string-length s) (cadr rest))))
(if (and (procedure? char_pred)
(> end start)
(<= end (string-length s))) ;; let c-code handle range error
(and (string-every-c-code char_pred s start (1- end))
(char_pred (string-ref s (1- end))))
(string-every-c-code char_pred s start end))))
;;; {EVAL-CASE}

4
libguile/srfi-13.c
View file

@ -75,7 +75,7 @@ race_error ()
}
#endif
SCM_DEFINE (scm_string_any, "string-any", 2, 2, 0,
SCM_DEFINE (scm_string_any, "string-any-c-code", 2, 2, 0,
(SCM char_pred, SCM s, SCM start, SCM end),
"Check if the predicate @var{pred} is true for any character in\n"
"the string @var{s}.\n"
@ -134,7 +134,7 @@ SCM_DEFINE (scm_string_any, "string-any", 2, 2, 0,
#undef FUNC_NAME
SCM_DEFINE (scm_string_every, "string-every", 2, 2, 0,
SCM_DEFINE (scm_string_every, "string-every-c-code", 2, 2, 0,
(SCM char_pred, SCM s, SCM start, SCM end),
"Check if the predicate @var{pred} is true for every character\n"
"in the string @var{s}.\n"