source: project/chicken/branches/prerelease/private-namespace.scm @ 15101

Last change on this file since 15101 was 15101, checked in by felix winkelmann, 10 years ago

merged trunk changes from 14491:15100 into prerelease branch

File size: 2.3 KB
Line 
1;;;; compiler-namespace.scm - A simple namespace system to keep compiler variables hidden
2;
3; Copyright (c) 2007, Felix L. Winkelmann
4; Copyright (c) 2008-2009, The Chicken Team
5; All rights reserved.
6;
7; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
8; conditions are met:
9;
10;   Redistributions of source code must retain the above copyright notice, this list of conditions and the following
11;     disclaimer.
12;   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
13;     disclaimer in the documentation and/or other materials provided with the distribution.
14;   Neither the name of the author nor the names of its contributors may be used to endorse or promote
15;     products derived from this software without specific prior written permission.
16;
17; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
18; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
19; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
20; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25; POSSIBILITY OF SUCH DAMAGE.
26
27
28(define-syntax private
29  (lambda (form r c)
30    (let ((namespace (cadr form))
31          (vars (cddr form)))
32      (##sys#check-symbol namespace 'private)
33      (let* ((str (symbol->string namespace)) ; somewhat questionable (renaming)
34             (prefix (string-append
35                      (string (integer->char (string-length str)))
36                      (symbol->string namespace))))
37        (for-each
38         (lambda (var)
39           (put! 
40            var 'c:namespace
41            (##sys#string->qualified-symbol prefix (symbol->string var))))
42         vars)
43        '(##core#undefined) ) ) ) ) 
44
45(set! ##sys#alias-global-hook
46  (lambda (var . assign)                ; must work with old chicken
47    (or (get var 'c:namespace) var) ) )
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