/usr/share/uim/lib/srfi-0.scm is in libuim-data 1:1.8.6+gh20161003.0.d63dadd-2.
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;; About : SRFI-0 Feature-based conditional expansion construct
;;
;; Copyright (c) 2007-2008 SigScheme Project <uim-en AT googlegroups.com>
;;
;; All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions
;; are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;; 3. Neither the name of authors nor the names of its contributors
;; may be used to endorse or promote products derived from this software
;; without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
;; IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
;; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(require-extension (srfi 23))
(define-macro %cond-expand-dummy
(lambda () #t))
(define %cond-expand-feature?
(lambda (feature-exp)
(cond
((symbol? feature-exp)
(or (eq? feature-exp 'else)
(provided? (symbol->string feature-exp))))
((pair? feature-exp)
(let ((directive (car feature-exp))
(args (cdr feature-exp)))
(case directive
((and)
;;(every %cond-expand-feature? args))
(not (memq #f (map %cond-expand-feature? args))))
((or)
;;(any %cond-expand-feature? args))
(not (not (memq #t (map %cond-expand-feature? args)))))
((not)
(if (not (null? (cdr args)))
(error "invalid feature expression"))
(not (%cond-expand-feature? (car args))))
(else
(error "invalid feature expression"))))))))
(define-macro cond-expand
(lambda clauses
(if (null? clauses)
(error "unfulfilled cond-expand")
;; (let ((clause (find (lambda (clause)
;; (%cond-expand-feature? (car clause)))
;; clauses)))
(let ((clause (let rec ((rest clauses))
(cond
((null? rest)
#f)
((%cond-expand-feature? (caar rest))
(car rest))
(else
(rec (cdr rest)))))))
(if clause
`(begin
;; raise error if cond-expand is placed in non-toplevel
(define-macro %cond-expand-dummy (lambda () #t))
. ,(cdr clause))
(error "unfulfilled cond-expand"))))))
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