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;;; morse.el --- Convert text to morse code and back.
;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Author: Rick Farnbach <rick_farnbach@MENTORG.COM>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Code:
(defvar morse-code '(("a" . ".-")
("b" . "-...")
("c" . "-.-.")
("d" . "-..")
("e" . ".")
("f" . "..-.")
("g" . "--.")
("h" . "....")
("i" . "..")
("j" . ".---")
("k" . "-.-")
("l" . ".-..")
("m" . "--")
("n" . "-.")
("o" . "---")
("p" . ".--.")
("q" . "--.-")
("r" . ".-.")
("s" . "...")
("t" . "-")
("u" . "..-")
("v" . "...-")
("w" . ".--")
("x" . "-..-")
("y" . "-.--")
("z" . "--..")
;; Punctuation
("=" . "-...-")
("?" . "..--..")
("/" . "-..-.")
("," . "--..--")
("." . ".-.-.-")
(":" . "---...")
("'" . ".----.")
("-" . "-....-")
("(" . "-.--.-")
(")" . "-.--.-")
;; Numbers
("0" . "-----")
("1" . ".----")
("2" . "..---")
("3" . "...--")
("4" . "....-")
("5" . ".....")
("6" . "-....")
("7" . "--...")
("8" . "---..")
("9" . "----."))
"Morse code character set.")
(defun morse-region (beg end)
"Convert all text in a given region to morse code."
(interactive "r")
(if (integerp end)
(setq end (copy-marker end)))
(save-excursion
(let ((sep "")
str morse)
(goto-char beg)
(while (< (point) end)
(setq str (downcase (buffer-substring (point) (1+ (point)))))
(cond ((looking-at "\\s-+")
(goto-char (match-end 0))
(setq sep ""))
((setq morse (assoc str morse-code))
(delete-char 1)
(insert sep (cdr morse))
(setq sep "/"))
(t
(forward-char 1)
(setq sep "")))))))
(defun unmorse-region (beg end)
"Convert morse coded text in region to ordinary ASCII text."
(interactive "r")
(if (integerp end)
(setq end (copy-marker end)))
(save-excursion
(let (str paren morse)
(goto-char beg)
(while (< (point) end)
(if (null (looking-at "[-.]+"))
(forward-char 1)
(setq str (buffer-substring (match-beginning 0) (match-end 0)))
(if (null (setq morse (rassoc str morse-code)))
(goto-char (match-end 0))
(replace-match
(if (string-equal "(" (car morse))
(if (setq paren (null paren)) "(" ")")
(car morse)) t)
(if (looking-at "/")
(delete-char 1))))))))
(provide 'morse)
;;; morse.el ends here
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