;; 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