lisp/play/morse.el

   1 ;;; morse.el --- convert text to morse code and back             -*- coding: utf-8 -*-
   2
   3 ;; Copyright (C) 1995, 2001-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: Rick Farnbach <rick_farnbach@MENTORG.COM>
   6 ;; Keywords: games
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; Converts text to Morse code and back with M-x morse-region and
  26 ;; M-x unmorse-region (though Morse code is no longer official :-().
  27
  28 ;;; Code:
  29
  30 (defvar morse-code '(("a" . ".-")
  31                      ("b" . "-...")
  32                      ("c" . "-.-.")
  33                      ("d" . "-..")
  34                      ("e" . ".")
  35                      ("f" . "..-.")
  36                      ("g" . "--.")
  37                      ("h" . "....")
  38                      ("i" . "..")
  39                      ("j" . ".---")
  40                      ("k" . "-.-")
  41                      ("l" . ".-..")
  42                      ("m" . "--")
  43                      ("n" . "-.")
  44                      ("o" . "---")
  45                      ("p" . ".--.")
  46                      ("q" . "--.-")
  47                      ("r" . ".-.")
  48                      ("s" . "...")
  49                      ("t" . "-")
  50                      ("u" . "..-")
  51                      ("v" . "...-")
  52                      ("w" . ".--")
  53                      ("x" . "-..-")
  54                      ("y" . "-.--")
  55                      ("z" . "--..")
  56                      ;; Punctuation
  57                      ("=" . "-...-")
  58                      ("?" . "..--..")
  59                      ("/" . "-..-.")
  60                      ("," . "--..--")
  61                      ("." . ".-.-.-")
  62                      (":" . "---...")
  63                      ("'" . ".----.")
  64                      ("-" . "-....-")
  65                      ("(" . "-.--.-")
  66                      (")" . "-.--.-")
  67                      ;; Numbers
  68                      ("0" . "-----")
  69                      ("1" . ".----")
  70                      ("2" . "..---")
  71                      ("3" . "...--")
  72                      ("4" . "....-")
  73                      ("5" . ".....")
  74                      ("6" . "-....")
  75                      ("7" . "--...")
  76                      ("8" . "---..")
  77                      ("9" . "----.")
  78                      ;; Non-ASCII
  79                      ("Ä" . ".-.-")
  80                      ("Æ" . ".-.-")
  81                      ("Á" . ".--.-")
  82                      ("Å" . ".--.-")
  83                      ;; ligature character?? ("Ch" . "----")
  84                      ("ß" . ".../...")
  85                      ("É" . "..-..")
  86                      ("Ñ" . "--.--")
  87                      ("Ö" . "---.")
  88                      ("Ø" . "---.")
  89                      ("Ü" . "..--")
  90                      ;; Recently standardized
  91                      ("@" . ".--.-."))
  92   "Morse code character set.")
  93
  94 ;;;###autoload
  95 (defun morse-region (beg end)
  96   "Convert all text in a given region to morse code."
  97   (interactive "r")
  98   (if (integerp end)
  99       (setq end (copy-marker end)))
 100   (save-excursion
 101     (let ((sep "")
 102           str morse)
 103       (goto-char beg)
 104       (while (< (point) end)
 105         (setq str (downcase (buffer-substring (point) (1+ (point)))))
 106         (cond ((looking-at "\\s-+")
 107                (goto-char (match-end 0))
 108                (setq sep ""))
 109               ((setq morse (assoc str morse-code))
 110                (delete-char 1)
 111                (insert sep (cdr morse))
 112                (setq sep "/"))
 113               (t
 114                (forward-char 1)
 115                (setq sep "")))))))
 116
 117 ;;;###autoload
 118 (defun unmorse-region (beg end)
 119   "Convert morse coded text in region to ordinary ASCII text."
 120   (interactive "r")
 121   (if (integerp end)
 122       (setq end (copy-marker end)))
 123   (save-excursion
 124     (let (str paren morse)
 125       (goto-char beg)
 126       (while (< (point) end)
 127         (if (null (looking-at "[-.]+"))
 128             (forward-char 1)
 129           (setq str (buffer-substring (match-beginning 0) (match-end 0)))
 130           (if (null (setq morse (rassoc str morse-code)))
 131               (goto-char (match-end 0))
 132             (replace-match
 133                   (if (string-equal "(" (car morse))
 134                       (if (setq paren (null paren)) "(" ")")
 135                     (car morse)) t)
 136             (if (looking-at "/")
 137                 (delete-char 1))))))))
 138
 139 (provide 'morse)
 140
 141 ;;; morse.el ends here