source: trunk/abcl/src/org/armedbear/lisp/source-transform.lisp @ 11457

Last change on this file since 11457 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: 3.3 KB
Line 
1;;; source-transform.lisp
2;;;
3;;; Copyright (C) 2004-2005 Peter Graves
4;;; $Id: source-transform.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(in-package #:system)
33
34(export '(source-transform define-source-transform expand-source-transform))
35
36(defun source-transform (name)
37  (get-function-info-value name :source-transform))
38
39(defun set-source-transform (name transform)
40  (set-function-info-value name :source-transform transform))
41
42(defsetf source-transform set-source-transform)
43
44(defmacro define-source-transform (name lambda-list &rest body)
45  (let* ((form (gensym))
46         (env (gensym))
47         (body (parse-defmacro lambda-list form body name 'defmacro
48                               :environment env))
49         (expander
50          (if (symbolp name)
51              `(lambda (,form) (block ,name ,body))
52              `(lambda (,form) (block ,(cadr name) ,body)))))
53    `(eval-when (:compile-toplevel :load-toplevel :execute)
54       (setf (source-transform ',name) ,expander)
55       ',name)))
56
57(defun expand-source-transform-1 (form)
58  (let ((expander nil)
59        (newdef nil))
60    (cond ((atom form)
61           (values form nil))
62          ((and (consp (%car form))
63                (eq (caar form) 'SETF)
64                (setf expander (source-transform (%car form))))
65           (values (setf newdef (funcall expander form))
66                   (not (eq newdef form))))
67          ((and (symbolp (%car form))
68                (setf expander (source-transform (%car form))))
69           (values (setf newdef (funcall expander form))
70                   (not (eq newdef form))))
71          (t
72           (values form nil)))))
73
74(defun expand-source-transform (form)
75  (let ((expanded-p nil))
76    (loop
77      (multiple-value-bind (expansion exp-p) (expand-source-transform-1 form)
78        (if exp-p
79            (setf form expansion
80                  expanded-p t)
81            (return))))
82    (values form expanded-p)))
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