source: trunk/j/src/org/armedbear/lisp/count.lisp @ 11391

Last change on this file since 11391 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: 4.1 KB
Line 
1;;; count.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: count.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 "COMMON-LISP")
33
34;;; From CMUCL.
35
36(defmacro vector-count-if (not-p from-end-p predicate sequence)
37  (let ((next-index (if from-end-p '(1- index) '(1+ index)))
38        (pred `(funcall ,predicate (sys::apply-key key (aref ,sequence index)))))
39    `(let ((%start ,(if from-end-p '(1- end) 'start))
40           (%end ,(if from-end-p '(1- start) 'end)))
41       (do ((index %start ,next-index)
42            (count 0))
43           ((= index %end) count)
44         (,(if not-p 'unless 'when) ,pred
45           (setq count (1+ count)))))))
46
47(defmacro list-count-if (not-p from-end-p predicate sequence)
48  (let ((pred `(funcall ,predicate (sys::apply-key key (pop sequence)))))
49    `(let ((%start ,(if from-end-p '(- length end) 'start))
50           (%end ,(if from-end-p '(- length start) 'end))
51           (sequence ,(if from-end-p '(reverse sequence) 'sequence)))
52       (do ((sequence (nthcdr %start ,sequence))
53            (index %start (1+ index))
54            (count 0))
55           ((or (= index %end) (null sequence)) count)
56         (,(if not-p 'unless 'when) ,pred
57           (setq count (1+ count)))))))
58
59(defun count (item sequence &key from-end (test #'eql test-p) (test-not nil test-not-p)
60       (start 0) end key)
61  (when (and test-p test-not-p)
62    (error "test and test-not both supplied"))
63  (let* ((length (length sequence))
64   (end (or end length)))
65    (let ((%test (if test-not-p
66         (lambda (x)
67           (not (funcall test-not item x)))
68         (lambda (x)
69           (funcall test item x)))))
70      (if (listp sequence)
71          (if from-end
72              (list-count-if nil t %test sequence)
73              (list-count-if nil nil %test sequence))
74          (if from-end
75              (vector-count-if nil t %test sequence)
76              (vector-count-if nil nil %test sequence))))))
77
78(defun count-if (test sequence &key from-end (start 0) end key)
79  (let* ((length (length sequence))
80   (end (or end length)))
81    (if (listp sequence)
82        (if from-end
83            (list-count-if nil t test sequence)
84            (list-count-if nil nil test sequence))
85        (if from-end
86            (vector-count-if nil t test sequence)
87            (vector-count-if nil nil test sequence)))))
88
89(defun count-if-not (test sequence &key from-end (start 0) end key)
90  (let* ((length (length sequence))
91   (end (or end length)))
92    (if (listp sequence)
93        (if from-end
94            (list-count-if t t test sequence)
95            (list-count-if t nil test sequence))
96        (if from-end
97            (vector-count-if t t test sequence)
98            (vector-count-if t nil test sequence)))))
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