private-namespace.scm

Scheme跨平台编译器

;;;; compiler-namespace.scm - A simple namespace system to keep compiler variables hidden
;
; Copyright (c) 2007, Felix L. Winkelmann
; Copyright (c) 2008, The Chicken Team
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
;   Redistributions of source code must retain the above copyright notice, this list of conditions and the following
;     disclaimer. 
;   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. 
;   Neither the name of the author 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.


(define-macro (private . args)
  (let ((namespace (car args))
	(vars (cdr args)))
    (##sys#check-symbol namespace 'private)
    (let* ((str (symbol->string namespace))
	   (prefix (string-append 
		    (string (integer->char (string-length str)))
		    (symbol->string namespace))))
      (for-each
       (lambda (var)
	 (put! 
	  var 'c:namespace
	  (##sys#string->qualified-symbol prefix (symbol->string var))))
       vars)
      '(void) ) ) )

(set! ##sys#alias-global-hook
  (lambda (var)
    (or (get var 'c:namespace) var) ) )