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;;; morse.el --- convert text to morse code and back -*- lexical-binding: t -*-
;; Copyright (C) 1995, 2001-2021 Free Software Foundation, Inc.
;; Author: Rick Farnbach <rick_farnbach@MENTORG.COM>
;; Keywords: games
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Converts text to Morse code and back with M-x morse-region and
;; M-x unmorse-region (though Morse code is no longer official :-().
;; Converts text to NATO phonetic alphabet and back with M-x
;; nato-region and M-x denato-region.
;;; 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" . "----.")
;; Non-ASCII
("Ä" . ".-.-")
("Æ" . ".-.-")
("Á" . ".--.-")
("Å" . ".--.-")
;; ligature character?? ("Ch" . "----")
("ß" . ".../...")
("É" . "..-..")
("Ñ" . "--.--")
("Ö" . "---.")
("Ø" . "---.")
("Ü" . "..--")
;; Recently standardized
("@" . ".--.-."))
"Morse code character set.")
(defvar nato-alphabet '(("a" . "Alfa")
("b" . "Bravo")
("c" . "Charlie")
("d" . "Delta")
("e" . "Echo")
("f" . "Foxtrot")
("g" . "Golf")
("h" . "Hotel")
("i" . "India")
("j" . "Juliett")
("k" . "Kilo")
("l" . "Lima")
("m" . "Mike")
("n" . "November")
("o" . "Oscar")
("p" . "Papa")
("q" . "Quebec")
("r" . "Romeo")
("s" . "Sierra")
("t" . "Tango")
("u" . "Uniform")
("v" . "Victor")
("w" . "Whiskey")
("x" . "Xray")
("y" . "Yankee")
("z" . "Zulu")
;; Numbers
("0" . "Zero")
("1" . "One")
("2" . "Two")
("3" . "Three")
("4" . "Four")
("5" . "Five")
("6" . "Six")
("7" . "Seven")
("8" . "Eight")
("9" . "Niner")
;; Punctuation is not part of standard
("=" . "Equals")
("?" . "Query")
("/" . "Slash")
("," . "Comma")
("." . "Stop")
(":" . "Colon")
("'" . "Apostrophe")
("-" . "Dash")
("(" . "Open")
(")" . "Close")
("@" . "At"))
"NATO phonetic alphabet.
See “International Code of Signals” (INTERCO), United States
Edition, 1969 Edition (Revised 2003) available from National
Geospatial-Intelligence Agency at URL `http://www.nga.mil/'")
;;;###autoload
(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 "")))))))
;;;###autoload
(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))))))))
;;;###autoload
(defun nato-region (beg end)
"Convert all text in a given region to NATO phonetic alphabet."
;; Copied from morse-region. -- ashawley 2009-02-10
(interactive "*r")
(if (integerp end)
(setq end (copy-marker end)))
(save-excursion
(let ((sep "")
str nato)
(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 nato (assoc str nato-alphabet))
(delete-char 1)
(insert sep (cdr nato))
(setq sep "-"))
(t
(forward-char 1)
(setq sep "")))))))
;;;###autoload
(defun denato-region (beg end)
"Convert NATO phonetic alphabet in region to ordinary ASCII text."
;; Copied from unmorse-region. -- ashawley 2009-02-10
(interactive "*r")
(if (integerp end)
(setq end (copy-marker end)))
(save-excursion
(let (str paren nato)
(goto-char beg)
(while (< (point) end)
(if (null (looking-at "[a-z]+"))
(forward-char 1)
(setq str (buffer-substring (match-beginning 0) (match-end 0)))
(if (null (setq nato (rassoc (capitalize str) nato-alphabet)))
(goto-char (match-end 0))
(replace-match
(if (string-equal "(" (car nato))
(if (setq paren (null paren)) "(" ")")
(car nato)) t)
(if (looking-at "-")
(delete-char 1))))))))
(provide 'morse)
;;; morse.el ends here
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