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[elisp/apel.git] / mule-caesar.el

diff --git a/mule-caesar.el b/mule-caesar.el
index d1e4955..172b586 100644 (file)
--- a/mule-caesar.el
+++ b/mule-caesar.el
@@ -1,9 +1,8 @@
 ;;; mule-caesar.el --- ROT 13-47 Caesar rotation utility
 
-;; Copyright (C) 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1997,1998 Free Software Foundation, Inc.
 
 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
-;; Version: $Id: mule-caesar.el,v 1.1 1997-05-09 01:22:58 morioka Exp $
 ;; Keywords: ROT 13-47, caesar, mail, news, text/x-rot13-47
 
 ;; This file is part of APEL (A Portable Emacs Library).
@@ -20,61 +19,68 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; Thanks for Martin Buchholz <mrb@eng.sun.com>'s suggestion
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Code:
 
-(defun mule-caesar-string (string &optional stride-ascii)
-  "Caesar rotation of STRING, and return the result.
-Optional argument STRIDE-ASCII is rotation-size for Latin alphabet
-\(A-Z and a-z).  For non-ASCII text, ROT47 will be performed in any
-case."
-  (setq stride-ascii
-       (if stride-ascii
-           (mod stride-ascii 26)
-         13))
-  (mapconcat (function
-             (lambda (chr)
-               (if (< chr 128)
-                   (cond ((and (<= ?A chr) (<= chr ?Z))
-                          (setq chr (+ chr stride-ascii))
-                          (if (> chr ?Z)
-                              (setq chr (- chr 26))
-                            ))
-                         ((and (<= ?a chr) (<= chr ?z))
-                          (setq chr (+ chr stride-ascii))
-                          (if (> chr ?z)
-                              (setq chr (- chr 26))
-                            )))
-                 (let ((octet (logand chr 127)))
-                   (if (and (< 32 octet) (< octet 127))
-                       (setq chr
-                             (if (< octet 80)
-                                 (+ chr 47)
-                               (- chr 47)))
-                     )))
-               (char-to-string chr)
-               )) string "")
-  )
+(require 'emu)                         ; for backward compatibility.
+(require 'poe)                         ; char-after.
+(require 'poem)                                ; charset-chars, char-charset,
+                                       ; and split-char.
 
-(defun mule-caesar-region (start end stride-ascii)
+(defun mule-caesar-region (start end &optional stride-ascii)
   "Caesar rotation of current region.
 Optional argument STRIDE-ASCII is rotation-size for Latin alphabet
-\(A-Z and a-z).  For non-ASCII text, ROT47 will be performed in any
-case."
+\(A-Z and a-z).  For non-ASCII text, ROT-N/2 will be performed in any
+case (N=charset-chars; 94 for 94 or 94x94 graphic character set; 96
+for 96 or 96x96 graphic character set)."
   (interactive "r\nP")
+  (setq stride-ascii (if stride-ascii
+                        (mod stride-ascii 26)
+                      13))
   (save-excursion
-    (let ((str (buffer-substring start end)))
-      (delete-region start end)
-      (insert (mule-caesar-string str stride-ascii))
-      )))
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char start)
+      (while (< (point)(point-max))
+       (let* ((chr (char-after (point))))
+         (cond ((and (<= ?A chr) (<= chr ?Z))
+                (setq chr (+ chr stride-ascii))
+                (if (> chr ?Z)
+                    (setq chr (- chr 26))
+                  )
+                (delete-char 1)
+                (insert chr)
+                )
+               ((and (<= ?a chr) (<= chr ?z))
+                (setq chr (+ chr stride-ascii))
+                (if (> chr ?z)
+                    (setq chr (- chr 26))
+                  )
+                (delete-char 1)
+                (insert chr)
+                )
+               ((<= chr ?\x9f)
+                (forward-char)
+                )
+               (t
+                (let* ((stride (lsh (charset-chars (char-charset chr)) -1))
+                       (ret (mapcar (function
+                                     (lambda (octet)
+                                       (if (< octet 80)
+                                           (+ octet stride)
+                                         (- octet stride)
+                                         )))
+                                    (cdr (split-char chr)))))
+                  (delete-char 1)
+                  (insert (make-char (char-charset chr)
+                                     (car ret)(car (cdr ret))))
+                  )))
+         )))))
 
 
-(provide 'mule-caesar)
+(require 'product)
+(product-provide (provide 'mule-caesar) (require 'apel-ver))
 
 ;;; mule-caesar.el ends here