source: trunk/abcl/src/org/armedbear/lisp/parse-integer.lisp @ 14215

Last change on this file since 14215 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: 3.1 KB
Line 
1;;; parse-integer.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: parse-integer.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 "SYSTEM")
33
34;;; From OpenMCL.
35
36(defun parse-integer-error (string)
37  (error 'parse-error "not an integer string: ~S" string))
38
39(defun parse-integer (string &key (start 0) end
40                             (radix 10) junk-allowed)
41  (when (null end)
42    (setq end (length string)))
43  (let ((index (do ((i start (1+ i)))
44                   ((= i end)
45                    (if junk-allowed
46                        (return-from parse-integer (values nil end))
47                        (parse-integer-error string)))
48                 (unless (whitespacep (char string i)) (return i))))
49        (minusp nil)
50        (found-digit nil)
51        (result 0))
52    (let ((char (char string index)))
53      (cond ((char= char #\-)
54             (setq minusp t)
55             (setq index (1+ index)))
56            ((char= char #\+)
57             (setq index (1+ index)))))
58    (loop
59      (when (= index end) (return nil))
60      (let* ((char (char string index))
61             (weight (digit-char-p char radix)))
62        (cond (weight
63               (setq result (+ weight (* result radix))
64                     found-digit t))
65              (junk-allowed (return nil))
66              ((whitespacep char)
67               (do () ((= (setq index (1+ index)) end))
68                 (unless (whitespacep (char string index))
69                   (parse-integer-error string)))
70               (return nil))
71              (t
72               (parse-integer-error string))))
73      (setq index (1+ index)))
74    (values
75     (if found-digit
76         (if minusp (- result) result)
77         (if junk-allowed
78             nil
79             (parse-integer-error string)))
80     index)))
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