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;;; 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)))))))
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