source: trunk/abcl/src/org/armedbear/lisp/rotatef.lisp

Last change on this file was 11391, checked in by vvoutilainen, 13 years ago

ABCL license is GPL + Classpath exception. This was intended
by Peter Graves, the original author. For reference, see
http://sourceforge.net/mailarchive/forum.php?thread_name=20040721115302.839%40prufrock&forum_name=armedbear-j-announce

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.3 KB
Line 
1;;; rotatef.lisp
2;;;
3;;; Copyright (C) 2004 Peter Graves
4;;; $Id: rotatef.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19;;;
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
31
32;;; Adapted from SBCL.
33
34(in-package #:system)
35
36(eval-when (:compile-toplevel)
37  (require '#:collect))
38
39(defmacro rotatef (&rest args &environment env)
40  (when args
41    (collect ((let*-bindings) (mv-bindings) (setters) (getters))
42      (dolist (arg args)
43  (multiple-value-bind (temps subforms store-vars setter getter)
44      (get-setf-expansion arg env)
45    (loop
46      for temp in temps
47      for subform in subforms
48      do (let*-bindings `(,temp ,subform)))
49    (mv-bindings store-vars)
50    (setters setter)
51    (getters getter)))
52      (setters nil)
53      (getters (car (getters)))
54      (labels ((thunk (mv-bindings getters)
55     (if mv-bindings
56         `((multiple-value-bind ,(car mv-bindings) ,(car getters)
57       ,@(thunk (cdr mv-bindings) (cdr getters))))
58         (setters))))
59  `(let* ,(let*-bindings)
60     ,@(thunk (mv-bindings) (cdr (getters))))))))
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