-;;; decipher.el --- Cryptanalyze monoalphabetic substitution ciphers
+;;; decipher.el --- cryptanalyze monoalphabetic substitution ciphers
;;
-;; Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+;; Copyright (C) 1995, 1996, 2003, 2005 Free Software Foundation, Inc.
;;
-;; Author: Christopher J. Madsen <ac608@yfn.ysu.edu>
+;; Author: Christopher J. Madsen <chris_madsen@geocities.com>
;; Keywords: games
;;
;; This file is part of GNU Emacs.
;; 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.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+;;; Commentary:
+;;
;;; Quick Start:
;;
;; To decipher a message, type or load it into a buffer and type
;; Helen Fouche Gaines
;; ISBN 0-486-20097-3
-;;; Commentary:
-;;
;; This package is designed to help you crack simple substitution
;; ciphers where one letter stands for another. It works for ciphers
;; with or without word divisions. (You must set the variable
;;
;; The buffer is made read-only so it can't be modified by normal
;; Emacs commands.
+;;
+;; Decipher supports Font Lock mode. To use it, you can also add
+;; (add-hook 'decipher-mode-hook 'turn-on-font-lock)
+;; See the variable `decipher-font-lock-keywords' if you want to customize
+;; the faces used. I'd like to thank Simon Marshall for his help in making
+;; Decipher work well with Font Lock.
;;; Things To Do:
;;
(eval-when-compile
(require 'cl))
-(defvar decipher-force-uppercase t
+(defgroup decipher nil
+ "Cryptanalyze monoalphabetic substitution ciphers."
+ :prefix "decipher-"
+ :group 'games)
+
+(defcustom decipher-force-uppercase t
"*Non-nil means to convert ciphertext to uppercase.
-Nil means the case of the ciphertext is preserved.
-This variable must be set before typing `\\[decipher]'.")
+nil means the case of the ciphertext is preserved.
+This variable must be set before typing `\\[decipher]'."
+ :type 'boolean
+ :group 'decipher)
-(defvar decipher-ignore-spaces nil
+
+(defcustom decipher-ignore-spaces nil
"*Non-nil means to ignore spaces and punctuation when counting digrams.
-You should set this to `nil' if the cipher message is divided into words,
-or `t' if it is not.
-This variable is buffer-local.")
+You should set this to nil if the cipher message is divided into words,
+or t if it is not.
+This variable is buffer-local."
+ :type 'boolean
+ :group 'decipher)
(make-variable-buffer-local 'decipher-ignore-spaces)
-(defvar decipher-undo-limit 5000
+(defcustom decipher-undo-limit 5000
"The maximum number of entries in the undo list.
When the undo list exceeds this number, 100 entries are deleted from
-the tail of the list.")
+the tail of the list."
+ :type 'integer
+ :group 'decipher)
+
+(defcustom decipher-mode-hook nil
+ "Hook to run upon entry to decipher."
+ :type 'hook
+ :group 'decipher)
;; End of user modifiable variables
;;--------------------------------------------------------------------
+(defvar decipher-font-lock-keywords
+ '(("^:.*" . font-lock-keyword-face)
+ ("^>.*" . font-lock-string-face)
+ ("^%!.*" . font-lock-constant-face)
+ ("^%.*" . font-lock-comment-face)
+ ("\\`(\\([a-z]+\\) +\\([A-Z]+\\)"
+ (1 font-lock-string-face)
+ (2 font-lock-keyword-face))
+ ("^)\\([A-Z ]+\\)\\([a-z ]+\\)"
+ (1 font-lock-keyword-face)
+ (2 font-lock-string-face)))
+ "Expressions to fontify in Decipher mode.
+
+Ciphertext uses `font-lock-keyword-face', plaintext uses
+`font-lock-string-face', comments use `font-lock-comment-face', and
+checkpoints use `font-lock-constant-face'. You can customize the
+display by changing these variables. For best results, I recommend
+that all faces use the same background color.
+
+For example, to display ciphertext in the `bold' face, use
+ (add-hook 'decipher-mode-hook
+ (lambda () (set (make-local-variable 'font-lock-keyword-face)
+ 'bold)))
+in your `.emacs' file.")
+
(defvar decipher-mode-map nil
"Keymap for Decipher mode.")
(if (not decipher-mode-map)
(define-key decipher-mode-map "R" 'decipher-restore-checkpoint)
(define-key decipher-mode-map "U" 'decipher-undo)
(define-key decipher-mode-map " " 'decipher-keypress)
- (substitute-key-definition 'undo 'decipher-undo
- decipher-mode-map global-map)
- (substitute-key-definition 'advertised-undo 'decipher-undo
- decipher-mode-map global-map)
+ (define-key decipher-mode-map [remap undo] 'decipher-undo)
+ (define-key decipher-mode-map [remap advertised-undo] 'decipher-undo)
(let ((key ?a))
(while (<= key ?z)
(define-key decipher-mode-map (vector key) 'decipher-keypress)
(setq case-fold-search nil)) ;Case is significant when searching
(use-local-map decipher-mode-map)
(set-syntax-table decipher-mode-syntax-table)
- (decipher-read-alphabet)
+ (unless (= (point-min) (point-max))
+ (decipher-read-alphabet))
+ (set (make-local-variable 'font-lock-defaults)
+ '(decipher-font-lock-keywords t))
;; Make the buffer writable when we exit Decipher mode:
- (make-local-hook 'change-major-mode-hook)
(add-hook 'change-major-mode-hook
(lambda () (setq buffer-read-only nil
buffer-undo-list nil))
nil t)
- (run-hooks 'decipher-mode-hook)
+ (run-mode-hooks 'decipher-mode-hook)
(setq buffer-read-only t))
(put 'decipher-mode 'mode-class 'special)
(setcdr (nthcdr (1- new-size) decipher-undo-list) nil)
(setq decipher-undo-list-size new-size))))))
+(defun decipher-copy-cons (cons)
+ (if cons
+ (cons (car cons) (cdr cons))))
+
(defun decipher-get-undo (cipher-char plain-char)
;; Return an undo record that will undo the result of
;; (decipher-set-map CIPHER-CHAR PLAIN-CHAR)
- ;; We must use copy-list because the original cons cells will be
+ ;; We must copy the cons cell because the original cons cells will be
;; modified using setcdr.
- (let ((cipher-map (copy-list (rassoc cipher-char decipher-alphabet)))
- (plain-map (copy-list (assoc plain-char decipher-alphabet))))
+ (let ((cipher-map (decipher-copy-cons (rassoc cipher-char decipher-alphabet)))
+ (plain-map (decipher-copy-cons (assoc plain-char decipher-alphabet))))
(cond ((equal ?\ plain-char)
cipher-map)
((equal cipher-char (cdr plain-map))
(decipher-insert plain-char)
(setq case-fold-search t ;Case is not significant
cipher-string (downcase cipher-string))
- (while (search-forward-regexp "^:" nil t)
- (setq bound (save-excursion (end-of-line) (point)))
- (while (search-forward cipher-string bound 'end)
- (decipher-insert plain-char))))))
+ (let ((font-lock-fontify-region-function 'ignore))
+ ;; insert-and-inherit will pick the right face automatically
+ (while (search-forward-regexp "^:" nil t)
+ (setq bound (save-excursion (end-of-line) (point)))
+ (while (search-forward cipher-string bound 'end)
+ (decipher-insert plain-char)))))))
(defun decipher-insert (char)
;; Insert CHAR in the row below point. It replaces any existing
(move-to-column col t)
(or (eolp)
(delete-char 1))
- (insert char))))
+ (insert-and-inherit char))))
;;--------------------------------------------------------------------
;; Checkpoints:
(decipher-read-alphabet)
(setq alphabet decipher-alphabet)
(goto-char (point-min))
- (and (re-search-forward "^).+$" nil t)
+ (and (re-search-forward "^).+" nil t)
(replace-match ")" nil nil))
- (while (re-search-forward "^>.+$" nil t)
+ (while (re-search-forward "^>.+" nil t)
(replace-match ">" nil nil))
(decipher-read-alphabet)
(while (setq mapping (pop alphabet))
(set-buffer (decipher-stats-buffer))
(goto-char (point-min))
(or (re-search-forward (format "^%c: " cipher-char) nil t)
- (error "Character `%c' is not used in ciphertext." cipher-char))
+ (error "Character `%c' is not used in ciphertext" cipher-char))
(forward-line -1)
(setq start (point))
(forward-line 3)
major-mode 'decipher-stats-mode
mode-name "Decipher-Stats")
(use-local-map decipher-stats-mode-map)
- (run-hooks 'decipher-stats-mode-hook))
+ (run-mode-hooks 'decipher-stats-mode-hook))
(put 'decipher-stats-mode 'mode-class 'special)
;;--------------------------------------------------------------------
;;; (delete-backward-char 1)
;;; (insert ")\n"))))))
+;;; arch-tag: 8f094d88-ffe1-4f99-afe3-a5e81dd939d9
;;; decipher.el ends here