;; Copyright (c) 2009 Derick Eddington
;;
;; Permission is hereby granted, free of charge, to any person obtaining a
;; copy of this software and associated documentation files (the "Software"),
;; to deal in the Software without restriction, including without limitation
;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
;; and/or sell copies of the Software, and to permit persons to whom the
;; Software is furnished to do so, subject to the following conditions:
;;
;; The above copyright notice and this permission notice shall be included in
;; all copies or substantial portions of the Software.
;;
;; Except as contained in this notice, the name(s) of the above copyright
;; holders shall not be used in advertising or otherwise to promote the sale,
;; use or other dealings in this Software without prior written authorization.
;;
;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
;; DEALINGS IN THE SOFTWARE.

#!r6rs
(library (srfi private OS-id-features)
  (export
    OS-id-features)
  (import 
   (only (rnrs) define apply append map cdr filter lambda car let and <= + or string-ci=? substring string-length)
    )

  (define (OS-id-features OS-id features-alist)
    (define OS-id-len (string-length OS-id))
    (define (OS-id-contains? str)
      (define str-len (string-length str))
      (let loop ((i 0))
        (and (<= (+ i str-len) OS-id-len)
             (or (string-ci=? str (substring OS-id i (+ i str-len)))
                 (loop (+ 1 i))))))
    (apply append
           (map cdr (filter (lambda (x) (OS-id-contains? (car x)))
                            features-alist))))
)