/usr/share/gauche-0.9/0.9.5/lib/srfi-7.scm is in gauche 0.9.5-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | ;; srfi-7 implementation, taken from Richard Kelsey's reference implementation.
;; Gauche module stuff added by Alex Shinn.
;; Copyright (C) Richard Kelsey (1999). All Rights Reserved.
;; This document and translations of it may be copied and furnished to
;; others, and derivative works that comment on or otherwise explain it or
;; assist in its implementation may be prepared, copied, published and
;; distributed, in whole or in part, without restriction of any kind,
;; provided that the above copyright notice and this paragraph are included
;; on all such copies and derivative works. However, this document itself
;; may not be modified in any way, such as by removing the copyright notice
;; or references to the Scheme Request For Implementation process or
;; editors, except as needed for the purpose of developing SRFIs in which
;; case the procedures for copyrights defined in the SRFI process must be
;; followed, or as required to translate it into languages other than
;; English.
;; [SK] the srfi-7 reference implementation using cond-expand expands
;; a form that ends with (begin), although the empty begin isn't defined
;; in R5RS.
;; Gauche usually compiles (begin) into a code that does nothing.
;; However, if there's a form like (begin <constant> (begin)), Gauche's
;; compiler optimizer removes <constant> as well.
;; A user might be surprised when he finds (program (code 4))
;; returns #<undef> ---but note that 'program' form isn't an expression
;; anyway, so expecting its result is beyond the scope of srfi-7.
(define-module srfi-7
(export program))
(select-module srfi-7)
(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 ...)))))
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