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