source: trunk/j/src/org/armedbear/lisp/fill.lisp @ 2248

Last change on this file since 2248 was 2248, checked in by piso, 18 years ago

Initial checkin.

File size: 1.6 KB
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1;;; fill.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: fill.lisp,v 1.1 2003-06-10 16:05:43 piso Exp $
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(in-package "COMMON-LISP")
21
22(export 'fill)
23
24;;; From CMUCL.
25
26(defmacro vector-fill (sequence item start end)
27  `(do ((index ,start (1+ index)))
28       ((= index ,end) ,sequence)
29     (setf (aref ,sequence index) ,item)))
30
31(defmacro list-fill (sequence item start end)
32  `(do ((current (nthcdr ,start ,sequence) (cdr current))
33        (index ,start (1+ index)))
34       ((or (atom current) (and end (= index ,end)))
35        sequence)
36     (rplaca current ,item)))
37
38(defun list-fill* (sequence item start end)
39  (list-fill sequence item start end))
40
41(defun vector-fill* (sequence item start end)
42  (when (null end) (setq end (length sequence)))
43  (vector-fill sequence item start end))
44
45(defun fill (sequence item &key (start 0) end)
46  (if (listp sequence)
47      (list-fill* sequence item start end)
48      (vector-fill* sequence item start end)))
49
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