stk/Lib/srfi-0.stk

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;;;; srfi-O.stk -- SRFI-0 aka cond-expand
;;;;
;;;; 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-0 (Marc Feeley). The implementation is
;;;; a simple adaptation of the one given in in the SRFI document.
;;;;
;;;; Author: Erick Gallesio [eg@unice.fr]
;;;; Creation date: 30-Aug-1999 16:26 (eg)
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;;;; Last file update: 27-Sep-1999 14:12 (eg)
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(require "defsyntax")
(define-syntax cond-expand
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(syntax-rules ( and or not else srfi-0 srfi-2 srfi-6 srfi-8 srfi-9)
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((cond-expand) (error "Unfulfilled cond-expand"))
((cond-expand (else body ...))
(begin body ...))
((cond-expand ((and) body ...) more-clauses ...)
(begin body ...))
((cond-expand ((and req1 req2 ...) body ...) more-clauses ...)
(cond-expand
(req1 (cond-expand ((and req2 ...) body ...) more-clauses ...))
more-clauses ...))
((cond-expand ((or) body ...) more-clauses ...)
(cond-expand more-clauses ...))
((cond-expand ((or req1 req2 ...) body ...) more-clauses ...)
(cond-expand (req1
(begin body ...))
(else (cond-expand ((or req2 ...) body ...)
more-clauses ...))))
((cond-expand ((not req) body ...) more-clauses ...)
(cond-expand (req (cond-expand more-clauses ...))
(else body ...)))
;; SRFI 0 -- COND-EXPAND
((cond-expand (srfi-0 body ...) more-clauses ...)
(begin body ...))
;; SRFI 1 -- List primitives
; not final
;; SRFI 2 -- LAND*
((cond-expand (srfi-2 body ...) more-clauses ...)
(begin (require "srfi-2") body ...))
;; SRFI 6 -- String ports
((cond-expand (srfi-6 body ...) more-clauses ...)
(begin body ...))
;; SRFI 8 -- RECEIVE
((cond-expand (srfi-8 body ...) more-clauses ...)
(begin body ...))
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;; SRFI 9 -- RECORDS
((cond-expand (srfi-9 body ...) more-clauses ...)
(begin body ...))
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((cond-expand (feature-id body ...) more-clauses ...)
(cond-expand more-clauses ...))))
(provide "srfi-0")