source: trunk/abcl/src/org/armedbear/lisp/defsetf.lisp @ 14196

Last change on this file since 14196 was 11391, checked in by vvoutilainen, 12 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: 3.7 KB
Line 
1;;; defsetf.lisp
2;;;
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: defsetf.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(require '#:collect)
37
38(defun %defsetf (orig-access-form num-store-vars expander)
39  (collect ((subforms) (subform-vars) (subform-exprs) (store-vars))
40           (dolist (subform (cdr orig-access-form))
41             (if (constantp subform)
42                 (subforms subform)
43                 (let ((var (gensym)))
44                   (subforms var)
45                   (subform-vars var)
46                   (subform-exprs subform))))
47           (dotimes (i num-store-vars)
48             (store-vars (gensym)))
49           (values (subform-vars)
50                   (subform-exprs)
51                   (store-vars)
52                   (funcall expander (cons (subforms) (store-vars)))
53                   `(,(car orig-access-form) ,@(subforms)))))
54
55(defmacro defsetf (access-fn &rest rest)
56  (cond ((not (listp (car rest)))
57   `(eval-when (:load-toplevel :compile-toplevel :execute)
58      (%define-setf-macro ',access-fn
59                                nil
60                                ',(car rest)
61        ,(when (and (car rest) (stringp (cadr rest)))
62           `',(cadr rest)))))
63  ((and (cdr rest) (listp (cadr rest)))
64   (destructuring-bind
65          (lambda-list (&rest store-variables) &body body)
66          rest
67          (let ((arglist-var (gensym "ARGS-"))
68                (access-form-var (gensym "ACCESS-FORM-"))
69                (env-var (gensym "ENVIRONMENT-")))
70            (multiple-value-bind
71              (body doc)
72              (parse-defmacro `(,lambda-list ,@store-variables)
73                              arglist-var body access-fn 'defsetf
74                              :anonymousp t)
75              `(eval-when (:load-toplevel :compile-toplevel :execute)
76                 (%define-setf-macro
77                  ',access-fn
78                  #'(lambda (,access-form-var ,env-var)
79                     (declare (ignore ,env-var))
80                     (%defsetf ,access-form-var ,(length store-variables)
81                               #'(lambda (,arglist-var)
82                                  (block ,access-fn
83                                    ,body))))
84                  nil
85                  ',doc))))))
86  (t
87   (error "Ill-formed DEFSETF for ~S" access-fn))))
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