lisp/play/morse.el

   1 ;;; morse.el --- convert text to morse code and back             -*- coding: utf-8 -*-
   2
   3 ;; Copyright (C) 1995, 2001, 2002, 2003, 2004, 2005,
   4 ;;   2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Rick Farnbach <rick_farnbach@MENTORG.COM>
   7 ;; Keywords: games
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  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., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Converts text to Morse code and back with M-x morse-region and
  29 ;; M-x unmorse-region (though Morse code is no longer official :-().
  30
  31 ;;; Code:
  32
  33 (defvar morse-code '(("a" . ".-")
  34                      ("b" . "-...")
  35                      ("c" . "-.-.")
  36                      ("d" . "-..")
  37                      ("e" . ".")
  38                      ("f" . "..-.")
  39                      ("g" . "--.")
  40                      ("h" . "....")
  41                      ("i" . "..")
  42                      ("j" . ".---")
  43                      ("k" . "-.-")
  44                      ("l" . ".-..")
  45                      ("m" . "--")
  46                      ("n" . "-.")
  47                      ("o" . "---")
  48                      ("p" . ".--.")
  49                      ("q" . "--.-")
  50                      ("r" . ".-.")
  51                      ("s" . "...")
  52                      ("t" . "-")
  53                      ("u" . "..-")
  54                      ("v" . "...-")
  55                      ("w" . ".--")
  56                      ("x" . "-..-")
  57                      ("y" . "-.--")
  58                      ("z" . "--..")
  59                      ;; Punctuation
  60                      ("=" . "-...-")
  61                      ("?" . "..--..")
  62                      ("/" . "-..-.")
  63                      ("," . "--..--")
  64                      ("." . ".-.-.-")
  65                      (":" . "---...")
  66                      ("'" . ".----.")
  67                      ("-" . "-....-")
  68                      ("(" . "-.--.-")
  69                      (")" . "-.--.-")
  70                      ;; Numbers
  71                      ("0" . "-----")
  72                      ("1" . ".----")
  73                      ("2" . "..---")
  74                      ("3" . "...--")
  75                      ("4" . "....-")
  76                      ("5" . ".....")
  77                      ("6" . "-....")
  78                      ("7" . "--...")
  79                      ("8" . "---..")
  80                      ("9" . "----.")
  81                      ;; Non-ASCII
  82                      ("Ä" . ".-.-")
  83                      ("Æ" . ".-.-")
  84                      ("Á" . ".--.-")
  85                      ("Å" . ".--.-")
  86                      ;; ligature character?? ("Ch" . "----")
  87                      ("ß" . ".../...")
  88                      ("É" . "..-..")
  89                      ("Ñ" . "--.--")
  90                      ("Ö" . "---.")
  91                      ("Ø" . "---.")
  92                      ("Ü" . "..--")
  93                      ;; Recently standardized
  94                      ("@" . ".--.-."))
  95   "Morse code character set.")
  96
  97 ;;;###autoload
  98 (defun morse-region (beg end)
  99   "Convert all text in a given region to morse code."
 100   (interactive "r")
 101   (if (integerp end)
 102       (setq end (copy-marker end)))
 103   (save-excursion
 104     (let ((sep "")
 105           str morse)
 106       (goto-char beg)
 107       (while (< (point) end)
 108         (setq str (downcase (buffer-substring (point) (1+ (point)))))
 109         (cond ((looking-at "\\s-+")
 110                (goto-char (match-end 0))
 111                (setq sep ""))
 112               ((setq morse (assoc str morse-code))
 113                (delete-char 1)
 114                (insert sep (cdr morse))
 115                (setq sep "/"))
 116               (t
 117                (forward-char 1)
 118                (setq sep "")))))))
 119
 120 ;;;###autoload
 121 (defun unmorse-region (beg end)
 122   "Convert morse coded text in region to ordinary ASCII text."
 123   (interactive "r")
 124   (if (integerp end)
 125       (setq end (copy-marker end)))
 126   (save-excursion
 127     (let (str paren morse)
 128       (goto-char beg)
 129       (while (< (point) end)
 130         (if (null (looking-at "[-.]+"))
 131             (forward-char 1)
 132           (setq str (buffer-substring (match-beginning 0) (match-end 0)))
 133           (if (null (setq morse (rassoc str morse-code)))
 134               (goto-char (match-end 0))
 135             (replace-match
 136                   (if (string-equal "(" (car morse))
 137                       (if (setq paren (null paren)) "(" ")")
 138                     (car morse)) t)
 139             (if (looking-at "/")
 140                 (delete-char 1))))))))
 141
 142 (provide 'morse)
 143
 144 ;;; arch-tag: 3331e6c1-9a9e-453f-abfd-163a9c3f93a6
 145 ;;; morse.el ends here