source: trunk/abcl/src/org/armedbear/lisp/map.lisp @ 14207

Last change on this file since 14207 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: 2.6 KB
Line 
1;;; map.lisp
2;;;
3;;; Copyright (C) 2005 Peter Graves
4;;; $Id: map.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(defun map (result-type function sequence &rest more-sequences)
35  (let* ((sequences (cons sequence more-sequences))
36         (limit (apply #'min (mapcar #'length sequences))))
37    (declare (type index limit))
38    (cond ((null result-type)
39           (dotimes (i limit nil)
40             (apply function (mapcar #'(lambda (z) (elt z i)) sequences))))
41          ((eq result-type 'LIST)
42           (let (result)
43             (dotimes (i limit (nreverse result))
44               (push (apply function (mapcar #'(lambda (z) (elt z i)) sequences))
45                     result))))
46          (t
47           (let ((result (case result-type
48                           (STRING
49                            (make-string limit))
50                           (VECTOR
51                            (make-array limit))
52                           (t
53                            (make-sequence result-type limit)))))
54             (dotimes (i limit result)
55               (setf (elt result i)
56                     (apply function (mapcar #'(lambda (z) (elt z i)) sequences)))))))))
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