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

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.0 KB
1;;; deftype.lisp
3;;; Copyright (C) 2004-2005 Peter Graves
4;;; $Id: deftype.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
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.
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14;;; GNU General Public License for more details.
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.
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.
32(in-package #:system)
34(defmacro deftype (name lambda-list &rest body)
35  (when (eq (symbol-package name) +cl-package+)
36    (error :format-control "Attempt to define ~S, a symbol in the COMMON-LISP package, as a type specifier."
37           :format-arguments (list name)))
38  (check-declaration-type name)
39  ;; Optional and keyword parameters default to * rather than NIL.
40  (when (or (memq '&optional lambda-list)
41            (memq '&key lambda-list))
42    (let ((new-lambda-list ())
43          (state nil))
44      (dolist (thing lambda-list)
45        (cond ((eq thing '&optional)
46               (setf state '&optional))
47              ((eq thing '&key)
48               (setf state '&key))
49              ((memq thing lambda-list-keywords)
50               (setf state nil))
51              ((eq state '&optional)
52               (when (symbolp thing)
53                 (setf thing (list thing ''*))))
54              ((eq state '&key)
55               (when (symbolp thing)
56                 (setf thing (list thing ''*)))))
57        (push thing new-lambda-list))
58      (setf lambda-list (nreverse new-lambda-list))))
59  `(progn
60     (setf (get ',name 'deftype-definition)
61           #'(lambda ,lambda-list (block ,name ,@body)))
62     ',name))
64(defun expand-deftype (type)
65  (let (tp i)
66    (loop
67      (if (consp type)
68          (setf tp (%car type) i (%cdr type))
69          (setf tp type
70                i nil))
71      (if (and (symbolp tp) (get tp 'deftype-definition))
72          (setf type (apply (get tp 'deftype-definition) i))
73          (return))))
74  type)
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