source: trunk/abcl/src/org/armedbear/lisp/sequences.lisp @ 12516

Last change on this file since 12516 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: 2.8 KB
Line 
1;;; sequences.lisp
2;;;
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: sequences.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;(require "EXTENSIBLE-SEQUENCES-BASE")
33
34(in-package #:system)
35
36(defmacro type-specifier-atom (type)
37  `(if (atom ,type) ,type (car ,type)))
38
39(defun make-sequence-of-type (type length)
40  (case (type-specifier-atom type)
41    (list
42     (make-list length))
43    ((bit-vector simple-bit-vector)
44     (make-array length :element-type 'bit))
45    ((simple-base-string simple-string string)
46     (make-string length))
47    ((simple-vector vector)
48     (if (cadr type)
49         (make-array length :element-type (cadr type))
50         (make-array length)))
51    (nil-vector
52     (make-array length :element-type nil))
53    (simple-array
54     (if (cadr type)
55         (make-array length :element-type (cadr type))
56         (make-array length)))
57    (t
58     (error "MAKE-SEQUENCE-OF-TYPE: unsupported case ~S" type))))
59
60(defmacro make-sequence-like (sequence length)
61  "Return a sequence of the same type as SEQUENCE and the given LENGTH."
62  ;;Can't use gensyms: stack overflow in boot.lisp
63    `(let ((msl-seq-tmp-var ,sequence) (msl-len-tmp-var ,length))
64       (sequence::seq-dispatch msl-seq-tmp-var
65   (make-sequence-of-type (type-of msl-seq-tmp-var) msl-len-tmp-var)
66   (make-sequence-of-type (type-of msl-seq-tmp-var) msl-len-tmp-var)
67   (sequence::make-sequence-like msl-seq-tmp-var msl-len-tmp-var))))
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