;;;
;;; srfi-14/query - character set (querying contents)
;;;
;;;   Copyright (c) 2000-2016  Shiro Kawai  <shiro@acm.org>
;;;
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;;;      notice, this list of conditions and the following disclaimer.
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;; Say `(use srfi-14)' and this file is autoloaded on demand.

(select-module srfi-14)

(define (char-set-count pred cs)
  (char-set-fold (lambda (c r) (if (pred c) (+ r 1) r)) 0 cs))

(define (char-set->list cs)
  (char-set-fold cons '() cs))

(define (char-set->string cs)
  (list->string (char-set-fold cons '() cs)))

;; char-set-contains? : native

(define (char-set-every pred cs)
  (let loop ((cursor (char-set-cursor cs)))
    (cond ((end-of-char-set? cursor))
          ((pred (char-set-ref cs cursor))
           (loop (char-set-cursor-next cs cursor)))
          (else #f))))

(define (char-set-any pred cs)
  (let loop ((cursor (char-set-cursor cs)))
    (cond ((end-of-char-set? cursor) #f)
          ((pred (char-set-ref cs cursor)) #t)
          (else (loop (char-set-cursor-next cs cursor))))))

