1 ;;; mule-caesar.el --- ROT 13-47 Caesar rotation utility
3 ;; Copyright (C) 1997,1998 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Keywords: ROT 13-47, caesar, mail, news, text/x-rot13-47
8 ;; This file is part of APEL (A Portable Emacs Library).
10 ;; This program is free software; you can redistribute it and/or
11 ;; modify it under the terms of the GNU General Public License as
12 ;; published by the Free Software Foundation; either version 2, or (at
13 ;; your option) any later version.
15 ;; This program is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 ;; Boston, MA 02110-1301, USA.
27 (require 'emu) ; for backward compatibility.
28 (require 'poe) ; char-after.
29 (require 'poem) ; charset-chars, char-charset,
32 (defun mule-caesar-region (start end &optional stride-ascii)
33 "Caesar rotation of current region.
34 Optional argument STRIDE-ASCII is rotation-size for Latin alphabet
35 \(A-Z and a-z). For non-ASCII text, ROT-N/2 will be performed in any
36 case (N=charset-chars; 94 for 94 or 94x94 graphic character set; 96
37 for 96 or 96x96 graphic character set)."
39 (setq stride-ascii (if stride-ascii
44 (narrow-to-region start end)
46 (while (< (point)(point-max))
47 (let* ((chr (char-after (point))))
48 (cond ((and (<= ?A chr) (<= chr ?Z))
49 (setq chr (+ chr stride-ascii))
56 ((and (<= ?a chr) (<= chr ?z))
57 (setq chr (+ chr stride-ascii))
68 (let* ((stride (lsh (charset-chars (char-charset chr)) -1))
69 (ret (mapcar (function
75 (cdr (split-char chr)))))
77 (insert (make-char (char-charset chr)
78 (car ret)(car (cdr ret))))
84 (product-provide (provide 'mule-caesar) (require 'apel-ver))
86 ;;; mule-caesar.el ends here