source: trunk/j/src/org/armedbear/lisp/do.lisp @ 11391

Last change on this file since 11391 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: 3.0 KB
Line 
1;;; do.lisp
2;;;
3;;; Copyright (C) 2004-2006 Peter Graves <peter@armedbear.org>
4;;;
5;;; This program is free software; you can redistribute it and/or
6;;; modify it under the terms of the GNU General Public License
7;;; as published by the Free Software Foundation; either version 2
8;;; of the License, or (at your option) any later version.
9;;;
10;;; This program is distributed in the hope that it will be useful,
11;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
12;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13;;; GNU General Public License for more details.
14;;;
15;;; You should have received a copy of the GNU General Public License
16;;; along with this program; if not, write to the Free Software
17;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
18;;;
19;;; As a special exception, the copyright holders of this library give you
20;;; permission to link this library with independent modules to produce an
21;;; executable, regardless of the license terms of these independent
22;;; modules, and to copy and distribute the resulting executable under
23;;; terms of your choice, provided that you also meet, for each linked
24;;; independent module, the terms and conditions of the license of that
25;;; module.  An independent module is a module which is not derived from
26;;; or based on this library.  If you modify this library, you may extend
27;;; this exception to your version of the library, but you are not
28;;; obligated to do so.  If you do not wish to do so, delete this
29;;; exception statement from your version.
30
31;;; Adapted from CMUCL.
32
33(in-package "SYSTEM")
34
35(defun do-do-body (varlist endlist decls-and-code bind step name block)
36  (let* ((inits ())
37   (steps ())
38   (L1 (gensym))
39   (L2 (gensym)))
40    ;; Check for illegal old-style do.
41    (when (or (not (listp varlist)) (atom endlist))
42      (error "Ill-formed ~S -- possibly illegal old style DO?" name))
43    ;; Parse the varlist to get inits and steps.
44    (dolist (v varlist)
45      (cond ((symbolp v) (push v inits))
46      ((listp v)
47       (unless (symbolp (first v))
48         (error "~S step variable is not a symbol: ~S" name (first v)))
49       (case (length v)
50         (1 (push (first v) inits))
51         (2 (push v inits))
52         (3 (push (list (first v) (second v)) inits)
53      (setq steps (list* (third v) (first v) steps)))
54         (t (error "~S is an illegal form for a ~S varlist." v name))))
55      (t (error "~S is an illegal form for a ~S varlist." v name))))
56    ;; Construct the new form.
57    (multiple-value-bind (code decls) (parse-body decls-and-code nil)
58      `(block ,block
59         (,bind ,(nreverse inits)
60          ,@decls
61          (tagbody
62           (go ,L2)
63           ,L1
64           ,@code
65           (,step ,@(nreverse steps))
66           ,L2
67           (unless ,(car endlist) (go ,L1))
68           (return-from ,block (progn ,@(cdr endlist)))))))))
69
70(defmacro do (varlist endlist &rest body)
71  (do-do-body varlist endlist body 'let 'psetq 'do nil))
72
73(defmacro do* (varlist endlist &rest body)
74  (do-do-body varlist endlist body 'let* 'setq 'do* nil))
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