guile/module/rnrs/control.scm

;;; control.scm --- The R6RS control structures library

;;      Copyright (C) 2010 Free Software Foundation, Inc.
;;
;; This library 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.
;; 
;; This library 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 library; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA


(library (rnrs control (6))
  (export when unless do case-lambda)
  (import (only (guile) if not begin define-syntax syntax-rules do case-lambda))

  (define-syntax when
    (syntax-rules ()
      ((when test result1 result2 ...)
       (if test (begin result1 result2 ...)))))

  (define-syntax unless
    (syntax-rules ()
      ((unless test result1 result2 ...)
       (if (not test) (begin result1 result2 ...))))))