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, 2008, 2009, 2010, 2011 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 3 of the License, or
  14 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Converts text to Morse code and back with M-x morse-region and
  27 ;; M-x unmorse-region (though Morse code is no longer official :-().
  28
  29 ;;; Code:
  30
  31 (defvar morse-code '(("a" . ".-")
  32                      ("b" . "-...")
  33                      ("c" . "-.-.")
  34                      ("d" . "-..")
  35                      ("e" . ".")
  36                      ("f" . "..-.")
  37                      ("g" . "--.")
  38                      ("h" . "....")
  39                      ("i" . "..")
  40                      ("j" . ".---")
  41                      ("k" . "-.-")
  42                      ("l" . ".-..")
  43                      ("m" . "--")
  44                      ("n" . "-.")
  45                      ("o" . "---")
  46                      ("p" . ".--.")
  47                      ("q" . "--.-")
  48                      ("r" . ".-.")
  49                      ("s" . "...")
  50                      ("t" . "-")
  51                      ("u" . "..-")
  52                      ("v" . "...-")
  53                      ("w" . ".--")
  54                      ("x" . "-..-")
  55                      ("y" . "-.--")
  56                      ("z" . "--..")
  57                      ;; Punctuation
  58                      ("=" . "-...-")
  59                      ("?" . "..--..")
  60                      ("/" . "-..-.")
  61                      ("," . "--..--")
  62                      ("." . ".-.-.-")
  63                      (":" . "---...")
  64                      ("'" . ".----.")
  65                      ("-" . "-....-")
  66                      ("(" . "-.--.-")
  67                      (")" . "-.--.-")
  68                      ;; Numbers
  69                      ("0" . "-----")
  70                      ("1" . ".----")
  71                      ("2" . "..---")
  72                      ("3" . "...--")
  73                      ("4" . "....-")
  74                      ("5" . ".....")
  75                      ("6" . "-....")
  76                      ("7" . "--...")
  77                      ("8" . "---..")
  78                      ("9" . "----.")
  79                      ;; Non-ASCII
  80                      ("Ä" . ".-.-")
  81                      ("Æ" . ".-.-")
  82                      ("Á" . ".--.-")
  83                      ("Å" . ".--.-")
  84                      ;; ligature character?? ("Ch" . "----")
  85                      ("ß" . ".../...")
  86                      ("É" . "..-..")
  87                      ("Ñ" . "--.--")
  88                      ("Ö" . "---.")
  89                      ("Ø" . "---.")
  90                      ("Ü" . "..--")
  91                      ;; Recently standardized
  92                      ("@" . ".--.-."))
  93   "Morse code character set.")
  94
  95 ;;;###autoload
  96 (defun morse-region (beg end)
  97   "Convert all text in a given region to morse code."
  98   (interactive "r")
  99   (if (integerp end)
 100       (setq end (copy-marker end)))
 101   (save-excursion
 102     (let ((sep "")
 103           str morse)
 104       (goto-char beg)
 105       (while (< (point) end)
 106         (setq str (downcase (buffer-substring (point) (1+ (point)))))
 107         (cond ((looking-at "\\s-+")
 108                (goto-char (match-end 0))
 109                (setq sep ""))
 110               ((setq morse (assoc str morse-code))
 111                (delete-char 1)
 112                (insert sep (cdr morse))
 113                (setq sep "/"))
 114               (t
 115                (forward-char 1)
 116                (setq sep "")))))))
 117
 118 ;;;###autoload
 119 (defun unmorse-region (beg end)
 120   "Convert morse coded text in region to ordinary ASCII text."
 121   (interactive "r")
 122   (if (integerp end)
 123       (setq end (copy-marker end)))
 124   (save-excursion
 125     (let (str paren morse)
 126       (goto-char beg)
 127       (while (< (point) end)
 128         (if (null (looking-at "[-.]+"))
 129             (forward-char 1)
 130           (setq str (buffer-substring (match-beginning 0) (match-end 0)))
 131           (if (null (setq morse (rassoc str morse-code)))
 132               (goto-char (match-end 0))
 133             (replace-match
 134                   (if (string-equal "(" (car morse))
 135                       (if (setq paren (null paren)) "(" ")")
 136                     (car morse)) t)
 137             (if (looking-at "/")
 138                 (delete-char 1))))))))
 139
 140 (provide 'morse)
 141
 142 ;;; morse.el ends here