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

Last change on this file since 11391 was 11391, checked in by vvoutilainen, 12 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: 3.5 KB
Line 
1;;; mismatch.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: mismatch.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;;; MISMATCH (from ECL)
32
33(in-package "COMMON-LISP")
34
35(export 'mismatch)
36
37;;; From ECL.
38
39(defun bad-seq-limit (x &optional y)
40  (error "bad sequence limit ~a" (if y (list x y) x)))
41
42(defun the-end (x y)
43  (cond ((sys::fixnump x)
44   (unless (<= x (length y))
45     (bad-seq-limit x))
46   x)
47  ((null x)
48   (length y))
49  (t (bad-seq-limit x))))
50
51(defun the-start (x)
52  (cond ((sys::fixnump x)
53   (unless (>= x 0)
54           (bad-seq-limit x))
55   x)
56  ((null x) 0)
57  (t (bad-seq-limit x))))
58
59(defmacro with-start-end (start end seq &body body)
60  `(let* ((,start (if ,start (the-start ,start) 0))
61          (,end (the-end ,end ,seq)))
62     (unless (<= ,start ,end) (bad-seq-limit ,start ,end))
63     ,@ body))
64
65(defun call-test (test test-not item keyx)
66  (cond (test (funcall test item keyx))
67        (test-not (not (funcall test-not item keyx)))
68        (t (eql item keyx))))
69
70(defun test-error()
71  (error "both test and test are supplied"))
72
73(defun mismatch (sequence1 sequence2 &key from-end test test-not
74                           (key #'identity) start1 start2 end1 end2)
75  (and test test-not (test-error))
76  (with-start-end
77    start1 end1 sequence1
78    (with-start-end
79      start2 end2 sequence2
80      (if (not from-end)
81          (do ((i1 start1 (1+ i1))
82               (i2 start2 (1+ i2)))
83              ((or (>= i1 end1) (>= i2 end2))
84               (if (and (>= i1 end1) (>= i2 end2)) nil i1))
85            (unless (call-test test test-not
86                               (funcall key (elt sequence1 i1))
87                               (funcall key (elt sequence2 i2)))
88              (return i1)))
89          (do ((i1 (1- end1) (1- i1))
90               (i2 (1- end2)  (1- i2)))
91              ((or (< i1 start1) (< i2 start2))
92               (if (and (< i1 start1) (< i2 start2)) nil (1+ i1)))
93            (unless (call-test test test-not
94                               (funcall key (elt sequence1 i1))
95                               (funcall key (elt sequence2 i2)))
96              (return (1+ i1))))))))
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