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

Last change on this file 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: 2.5 KB
Line 
1;;; fill.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: fill.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(require "EXTENSIBLE-SEQUENCES-BASE")
35
36;;; Adapted from CMUCL.
37
38(defun list-fill (sequence item start end)
39  (do ((current (nthcdr start sequence) (cdr current))
40       (index start (1+ index)))
41      ((or (atom current) (and end (= index end)))
42       sequence)
43    (rplaca current item)))
44
45(defun vector-fill (sequence item start end)
46  (unless end
47    (setf end (length sequence)))
48  (do ((index start (1+ index)))
49      ((= index end) sequence)
50    (setf (aref sequence index) item)))
51
52(defun fill (sequence item &key (start 0) end)
53  "Replace the specified elements of SEQUENCE with ITEM."
54  (sequence::seq-dispatch sequence
55    (list-fill sequence item start end)
56    (cond ((and (stringp sequence)
57    (zerop start)
58    (null end))
59     (simple-string-fill sequence item))
60    (t
61     (vector-fill sequence item start end)))
62    (sequence:fill sequence item
63       :start start
64       :end (sequence::%check-generic-sequence-bounds
65       sequence start end))))
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