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

Last change on this file since 14196 was 12516, checked in by astalla, 11 years ago

Support for user-extensible sequences, adapted from SBCL.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.9 KB
Line 
1;;; concatenate.lisp
2;;;
3;;; Copyright (C) 2003-2006 Peter Graves
4;;; $Id: concatenate.lisp 12516 2010-03-03 21:05:41Z astalla $
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 concatenate-to-string (sequences)
35  (declare (optimize speed (safety 0)))
36  (let ((length 0))
37    (declare (type fixnum length))
38    (dolist (seq sequences)
39      (incf length (length seq)))
40    (let ((result (make-string length))
41          (i 0))
42      (declare (type index i))
43      (dolist (seq sequences result)
44        (if (stringp seq)
45            (dotimes (j (length seq))
46              (declare (type index j))
47              (setf (schar result i) (char (truly-the string seq) j))
48              (incf i))
49            (dotimes (j (length seq))
50              (declare (type index j))
51              (setf (schar result i) (elt seq j))
52              (incf i)))))))
53
54;;It uses make-sequence: it should already be user-extensible as-is
55(defun concatenate (result-type &rest sequences)
56  (case result-type
57    (LIST
58     (let ((result ()))
59       (dolist (seq sequences (nreverse result))
60         (dotimes (i (length seq))
61           (push (elt seq i) result)))))
62    ((STRING SIMPLE-STRING)
63     (concatenate-to-string sequences))
64    (t
65     (let* ((length (apply '+ (mapcar 'length sequences)))
66            (result (make-sequence result-type length))
67            (i 0))
68       (declare (type index i))
69       (dolist (seq sequences result)
70         (dotimes (j (length seq))
71           (setf (elt result i) (elt seq j))
72           (incf i)))))))
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