stk/Lib/srfi-7.stk

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1999-09-05 07:16:41 -04:00
;;;; srfi-7.stk -- SRFI-7 (PROGRAM)
;;;;
;;;; Copyright <20> 1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; Permission to use, copy, modify, distribute,and license this
;;;; software and its documentation for any purpose is hereby granted,
;;;; provided that existing copyright notices are retained in all
;;;; copies and that this notice is included verbatim in any
;;;; distributions. No written agreement, license, or royalty fee is
;;;; required for any of the authorized uses.
;;;; This software is provided ``AS IS'' without express or implied
;;;; warranty.
;;;;
;;;; This is an implementation of SRFI-7 (Richard Kelsey). This implementation
;;;; corresponds to the second implementation given in the reference document.
;;;;
;;;; Author: Erick Gallesio [eg@unice.fr]
;;;; Creation date: 31-Aug-1999 16:10 (eg)
;;;; Last file update: 3-Sep-1999 19:54 (eg)
(require "defsyntax")
(define-syntax program
(syntax-rules (requires files code feature-cond)
((program)
(begin))
((program (requires feature-id ...) more ...)
(begin (cond-expand ((and feature-id ...) 'okay)) (program more ...)))
((program (files filename ...) more ...)
(begin (load filename) ... (program more ...)))
((program (code stuff ...) more ...)
(begin stuff ... (program more ...)))
((program (feature-cond (requirement stuff ...) ...) more ...)
(begin (cond-expand (requirement (program stuff ...)) ...)
(program more ...)))))
(provide "srfi-7")