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;; utils.ss -- generic utilities
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sun May 03, 2009 03:09
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3 of the License, or
;; (at your option) any later version.
;; This file 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/>.
;;; Comentary:
;; Utility procedures
;;; Code:
#lang scheme
(provide pair->list
keyword->symbol
symbol->keyword)
(define (pair->list pair)
(let loop ((d pair) (s '()))
(cond ((null? d) (reverse s))
((symbol? d) (reverse (cons d s)))
(else (loop (cdr d) (cons (car d) s))))))
(define keyword->symbol (compose string->symbol keyword->string))
(define (symbol->keyword sym) (string->keyword (format "~a" sym)))
;;; utils.ss ends here
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