1 ;;; mule-caesar.el --- ROT 13-47 Caesar rotation utility
3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Version: $Id: mule-caesar.el,v 1.4 1998-06-05 00:26:48 morioka Exp $
7 ;; Keywords: ROT 13-47, caesar, mail, news, text/x-rot13-47
9 ;; This file is part of APEL (A Portable Emacs Library).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
28 ;; avoid bug of XEmacs
29 (or (integerp (cdr (split-char ?a)))
30 (defun split-char (char)
31 "Return list of charset and one or two position-codes of CHAR."
32 (let ((charset (char-charset char)))
33 (if (eq charset 'ascii)
34 (list charset (char-int char))
36 (len (charset-dimension charset))
37 (code (if (integerp char)
42 (setq dest (cons (logand code 127) dest)
49 (defun char-to-octet-list (character)
50 "Return list of octets in code table of graphic character set."
51 (cdr (split-char character)))
53 (defun mule-caesar-region (start end &optional stride-ascii)
54 "Caesar rotation of current region.
55 Optional argument STRIDE-ASCII is rotation-size for Latin alphabet
56 \(A-Z and a-z). For non-ASCII text, ROT-N/2 will be performed in any
57 case (N=charset-chars; 94 for 94 or 94x94 graphic character set; 96
58 for 96 or 96x96 graphic character set)."
60 (setq stride-ascii (if stride-ascii
65 (narrow-to-region start end)
67 (while (< (point)(point-max))
68 (let* ((chr (char-after (point)))
69 (charset (char-charset chr))
71 (if (eq charset 'ascii)
72 (cond ((and (<= ?A chr) (<= chr ?Z))
73 (setq chr (+ chr stride-ascii))
80 ((and (<= ?a chr) (<= chr ?z))
81 (setq chr (+ chr stride-ascii))
91 (let* ((stride (lsh (charset-chars charset) -1))
92 (ret (mapcar (function
98 (char-to-octet-list chr))))
100 (insert (make-char (char-charset chr)
101 (car ret)(car (cdr ret))))
105 (provide 'mule-caesar)
107 ;;; mule-caesar.el ends here