;;; guile-2d
;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
;;;
;;; Guile-2d is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-2d 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
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this program.  If not, see
;;; <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; Wrapper helper procedures.
;;
;;; Code:

(define-module (2d wrappers util)
  #:export (define-enumeration))

;; Borrowed from guile-figl
(define-syntax-rule (define-enumeration enumerator (name value) ...)
  (define-syntax enumerator
    (lambda (x)
      (syntax-case x ()
        ((_)
         #''(name ...))
        ((_ enum) (number? (syntax->datum #'enum))
         #'enum)
        ((_ enum)
         (or (assq-ref '((name . value) ...)
                       (syntax->datum #'enum))
             (syntax-violation 'enumerator "invalid enumerated value"
                               #'enum)))))))