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6e44da43 | 1 | ;;; decipher.el --- cryptanalyze monoalphabetic substitution ciphers |
c10902fb | 2 | ;; |
f2e3589a | 3 | ;; Copyright (C) 1995, 1996, 2001, 2002, 2003, 2004, |
d7a0267c | 4 | ;; 2005, 2006, 2007 Free Software Foundation, Inc. |
c10902fb | 5 | ;; |
bb10be4c | 6 | ;; Author: Christopher J. Madsen <chris_madsen@geocities.com> |
c10902fb RS |
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 | |
5a9dffec | 13 | ;; the Free Software Foundation; either version 3, or (at your option) |
c10902fb RS |
14 | ;; 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 | |
1fb87c77 | 22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
3a35cf56 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
c10902fb | 25 | |
9f56503b DL |
26 | ;;; Commentary: |
27 | ;; | |
c10902fb RS |
28 | ;;; Quick Start: |
29 | ;; | |
30 | ;; To decipher a message, type or load it into a buffer and type | |
31 | ;; `M-x decipher'. This will format the buffer and place it into | |
32 | ;; Decipher mode. You can save your work to a file with the normal | |
33 | ;; Emacs save commands; when you reload the file it will automatically | |
34 | ;; enter Decipher mode. | |
35 | ;; | |
36 | ;; I'm not going to discuss how to go about breaking a cipher; try | |
37 | ;; your local library for a book on cryptanalysis. One book you might | |
38 | ;; find is: | |
39 | ;; Cryptanalysis: A study of ciphers and their solution | |
40 | ;; Helen Fouche Gaines | |
41 | ;; ISBN 0-486-20097-3 | |
42 | ||
c10902fb RS |
43 | ;; This package is designed to help you crack simple substitution |
44 | ;; ciphers where one letter stands for another. It works for ciphers | |
45 | ;; with or without word divisions. (You must set the variable | |
46 | ;; decipher-ignore-spaces for ciphers without word divisions.) | |
47 | ;; | |
48 | ;; First, some quick definitions: | |
49 | ;; ciphertext The encrypted message (what you start with) | |
50 | ;; plaintext The decrypted message (what you are trying to get) | |
51 | ;; | |
52 | ;; Decipher mode displays ciphertext in uppercase and plaintext in | |
53 | ;; lowercase. You must enter the plaintext in lowercase; uppercase | |
54 | ;; letters are interpreted as commands. The ciphertext may be entered | |
55 | ;; in mixed case; `M-x decipher' will convert it to uppercase. | |
56 | ;; | |
57 | ;; Decipher mode depends on special characters in the first column of | |
58 | ;; each line. The command `M-x decipher' inserts these characters for | |
59 | ;; you. The characters and their meanings are: | |
60 | ;; ( The plaintext & ciphertext alphabets on the first line | |
61 | ;; ) The ciphertext & plaintext alphabets on the second line | |
62 | ;; : A line of ciphertext (with plaintext below) | |
63 | ;; > A line of plaintext (with ciphertext above) | |
64 | ;; % A comment | |
65 | ;; Each line in the buffer MUST begin with one of these characters (or | |
66 | ;; be left blank). In addition, comments beginning with `%!' are reserved | |
67 | ;; for checkpoints; see decipher-make-checkpoint & decipher-restore-checkpoint | |
68 | ;; for more information. | |
69 | ;; | |
70 | ;; While the cipher message may contain digits or punctuation, Decipher | |
71 | ;; mode will ignore these characters. | |
72 | ;; | |
73 | ;; The buffer is made read-only so it can't be modified by normal | |
74 | ;; Emacs commands. | |
40600c94 RS |
75 | ;; |
76 | ;; Decipher supports Font Lock mode. To use it, you can also add | |
77 | ;; (add-hook 'decipher-mode-hook 'turn-on-font-lock) | |
78 | ;; See the variable `decipher-font-lock-keywords' if you want to customize | |
79 | ;; the faces used. I'd like to thank Simon Marshall for his help in making | |
80 | ;; Decipher work well with Font Lock. | |
c10902fb RS |
81 | |
82 | ;;; Things To Do: | |
83 | ;; | |
ddfb0a34 KH |
84 | ;; Email me if you have any suggestions or would like to help. |
85 | ;; But be aware that I work on Decipher only sporadically. | |
86 | ;; | |
87 | ;; 1. The consonant-line shortcut | |
88 | ;; 2. More functions for analyzing ciphertext | |
c10902fb RS |
89 | |
90 | ;;;=================================================================== | |
91 | ;;; Variables: | |
92 | ;;;=================================================================== | |
93 | ||
cb4d47c5 RS |
94 | (eval-when-compile |
95 | (require 'cl)) | |
c10902fb | 96 | |
323f7c49 SE |
97 | (defgroup decipher nil |
98 | "Cryptanalyze monoalphabetic substitution ciphers." | |
99 | :prefix "decipher-" | |
100 | :group 'games) | |
101 | ||
102 | (defcustom decipher-force-uppercase t | |
c10902fb | 103 | "*Non-nil means to convert ciphertext to uppercase. |
f0529b5b | 104 | nil means the case of the ciphertext is preserved. |
323f7c49 SE |
105 | This variable must be set before typing `\\[decipher]'." |
106 | :type 'boolean | |
107 | :group 'decipher) | |
108 | ||
c10902fb | 109 | |
323f7c49 | 110 | (defcustom decipher-ignore-spaces nil |
c10902fb | 111 | "*Non-nil means to ignore spaces and punctuation when counting digrams. |
e7f32a75 JB |
112 | You should set this to nil if the cipher message is divided into words, |
113 | or t if it is not. | |
323f7c49 SE |
114 | This variable is buffer-local." |
115 | :type 'boolean | |
116 | :group 'decipher) | |
c10902fb RS |
117 | (make-variable-buffer-local 'decipher-ignore-spaces) |
118 | ||
323f7c49 | 119 | (defcustom decipher-undo-limit 5000 |
c10902fb RS |
120 | "The maximum number of entries in the undo list. |
121 | When the undo list exceeds this number, 100 entries are deleted from | |
323f7c49 SE |
122 | the tail of the list." |
123 | :type 'integer | |
124 | :group 'decipher) | |
125 | ||
126 | (defcustom decipher-mode-hook nil | |
127 | "Hook to run upon entry to decipher." | |
128 | :type 'hook | |
129 | :group 'decipher) | |
c10902fb RS |
130 | |
131 | ;; End of user modifiable variables | |
132 | ;;-------------------------------------------------------------------- | |
133 | ||
a378799a | 134 | (defvar decipher-font-lock-keywords |
40600c94 RS |
135 | '(("^:.*" . font-lock-keyword-face) |
136 | ("^>.*" . font-lock-string-face) | |
883212ce | 137 | ("^%!.*" . font-lock-constant-face) |
40600c94 RS |
138 | ("^%.*" . font-lock-comment-face) |
139 | ("\\`(\\([a-z]+\\) +\\([A-Z]+\\)" | |
a378799a | 140 | (1 font-lock-string-face) |
40600c94 RS |
141 | (2 font-lock-keyword-face)) |
142 | ("^)\\([A-Z ]+\\)\\([a-z ]+\\)" | |
143 | (1 font-lock-keyword-face) | |
144 | (2 font-lock-string-face))) | |
a378799a | 145 | "Expressions to fontify in Decipher mode. |
4f2c8fbb | 146 | |
67edb19c | 147 | Ciphertext uses `font-lock-keyword-face', plaintext uses |
40600c94 | 148 | `font-lock-string-face', comments use `font-lock-comment-face', and |
883212ce | 149 | checkpoints use `font-lock-constant-face'. You can customize the |
40600c94 RS |
150 | display by changing these variables. For best results, I recommend |
151 | that all faces use the same background color. | |
4f2c8fbb | 152 | |
67edb19c | 153 | For example, to display ciphertext in the `bold' face, use |
40600c94 RS |
154 | (add-hook 'decipher-mode-hook |
155 | (lambda () (set (make-local-variable 'font-lock-keyword-face) | |
156 | 'bold))) | |
157 | in your `.emacs' file.") | |
158 | ||
c10902fb RS |
159 | (defvar decipher-mode-map nil |
160 | "Keymap for Decipher mode.") | |
161 | (if (not decipher-mode-map) | |
162 | (progn | |
163 | (setq decipher-mode-map (make-keymap)) | |
164 | (suppress-keymap decipher-mode-map) | |
165 | (define-key decipher-mode-map "A" 'decipher-show-alphabet) | |
166 | (define-key decipher-mode-map "C" 'decipher-complete-alphabet) | |
167 | (define-key decipher-mode-map "D" 'decipher-digram-list) | |
168 | (define-key decipher-mode-map "F" 'decipher-frequency-count) | |
169 | (define-key decipher-mode-map "M" 'decipher-make-checkpoint) | |
170 | (define-key decipher-mode-map "N" 'decipher-adjacency-list) | |
171 | (define-key decipher-mode-map "R" 'decipher-restore-checkpoint) | |
172 | (define-key decipher-mode-map "U" 'decipher-undo) | |
173 | (define-key decipher-mode-map " " 'decipher-keypress) | |
3ed7472c AS |
174 | (define-key decipher-mode-map [remap undo] 'decipher-undo) |
175 | (define-key decipher-mode-map [remap advertised-undo] 'decipher-undo) | |
c10902fb RS |
176 | (let ((key ?a)) |
177 | (while (<= key ?z) | |
178 | (define-key decipher-mode-map (vector key) 'decipher-keypress) | |
179 | (incf key))))) | |
180 | ||
181 | (defvar decipher-stats-mode-map nil | |
182 | "Keymap for Decipher-Stats mode.") | |
183 | (if (not decipher-stats-mode-map) | |
184 | (progn | |
185 | (setq decipher-stats-mode-map (make-keymap)) | |
186 | (suppress-keymap decipher-stats-mode-map) | |
187 | (define-key decipher-stats-mode-map "D" 'decipher-digram-list) | |
188 | (define-key decipher-stats-mode-map "F" 'decipher-frequency-count) | |
189 | (define-key decipher-stats-mode-map "N" 'decipher-adjacency-list) | |
190 | )) | |
191 | ||
192 | (defvar decipher-mode-syntax-table nil | |
193 | "Decipher mode syntax table") | |
194 | ||
195 | (if decipher-mode-syntax-table | |
196 | () | |
197 | (let ((table (make-syntax-table)) | |
198 | (c ?0)) | |
199 | (while (<= c ?9) | |
200 | (modify-syntax-entry c "_" table) ;Digits are not part of words | |
201 | (incf c)) | |
202 | (setq decipher-mode-syntax-table table))) | |
203 | ||
204 | (defvar decipher-alphabet nil) | |
205 | ;; This is an alist containing entries (PLAIN-CHAR . CIPHER-CHAR), | |
206 | ;; where PLAIN-CHAR runs from ?a to ?z and CIPHER-CHAR is an uppercase | |
207 | ;; letter or space (which means no mapping is known for that letter). | |
208 | ;; This *must* contain entries for all lowercase characters. | |
209 | (make-variable-buffer-local 'decipher-alphabet) | |
210 | ||
211 | (defvar decipher-stats-buffer nil | |
212 | "The buffer which displays statistics for this ciphertext. | |
213 | Do not access this variable directly, use the function | |
214 | `decipher-stats-buffer' instead.") | |
215 | (make-variable-buffer-local 'decipher-stats-buffer) | |
216 | ||
217 | (defvar decipher-undo-list-size 0 | |
218 | "The number of entries in the undo list.") | |
219 | (make-variable-buffer-local 'decipher-undo-list-size) | |
220 | ||
221 | (defvar decipher-undo-list nil | |
222 | "The undo list for this buffer. | |
223 | Each element is either a cons cell (PLAIN-CHAR . CIPHER-CHAR) or a | |
224 | list of such cons cells.") | |
225 | (make-variable-buffer-local 'decipher-undo-list) | |
226 | ||
227 | (defvar decipher-pending-undo-list nil) | |
228 | ||
ddfb0a34 KH |
229 | ;; The following variables are used by the analysis functions |
230 | ;; and are defined here to avoid byte-compiler warnings. | |
231 | ;; Don't mess with them unless you know what you're doing. | |
232 | (defvar decipher-char nil | |
233 | "See the functions decipher-loop-with-breaks and decipher-loop-no-breaks.") | |
234 | (defvar decipher--prev-char) | |
235 | (defvar decipher--digram) | |
236 | (defvar decipher--digram-list) | |
237 | (defvar decipher--before) | |
238 | (defvar decipher--after) | |
239 | (defvar decipher--freqs) | |
240 | ||
c10902fb RS |
241 | ;;;=================================================================== |
242 | ;;; Code: | |
243 | ;;;=================================================================== | |
244 | ;; Main entry points: | |
245 | ;;-------------------------------------------------------------------- | |
246 | ||
247 | ;;;###autoload | |
248 | (defun decipher () | |
249 | "Format a buffer of ciphertext for cryptanalysis and enter Decipher mode." | |
250 | (interactive) | |
251 | ;; Make sure the buffer ends in a newline: | |
252 | (goto-char (point-max)) | |
253 | (or (bolp) | |
254 | (insert "\n")) | |
255 | ;; See if it's already in decipher format: | |
256 | (goto-char (point-min)) | |
257 | (if (looking-at "^(abcdefghijklmnopqrstuvwxyz \ | |
258 | ABCDEFGHIJKLMNOPQRSTUVWXYZ -\\*-decipher-\\*-\n)") | |
259 | (message "Buffer is already formatted, entering Decipher mode...") | |
260 | ;; Add the alphabet at the beginning of the file | |
261 | (insert "(abcdefghijklmnopqrstuvwxyz \ | |
262 | ABCDEFGHIJKLMNOPQRSTUVWXYZ -*-decipher-*-\n)\n\n") | |
263 | ;; Add lines for the solution: | |
264 | (let (begin) | |
265 | (while (not (eobp)) | |
266 | (if (looking-at "^%") | |
267 | (forward-line) ;Leave comments alone | |
268 | (delete-horizontal-space) | |
269 | (if (eolp) | |
270 | (forward-line) ;Just leave blank lines alone | |
271 | (insert ":") ;Mark ciphertext line | |
272 | (setq begin (point)) | |
273 | (forward-line) | |
274 | (if decipher-force-uppercase | |
275 | (upcase-region begin (point))) ;Convert ciphertext to uppercase | |
276 | (insert ">\n"))))) ;Mark plaintext line | |
277 | (delete-blank-lines) ;Remove any blank lines | |
278 | (delete-blank-lines)) ; at end of buffer | |
279 | (goto-line 4) | |
280 | (decipher-mode)) | |
281 | ||
282 | ;;;###autoload | |
283 | (defun decipher-mode () | |
284 | "Major mode for decrypting monoalphabetic substitution ciphers. | |
285 | Lower-case letters enter plaintext. | |
286 | Upper-case letters are commands. | |
287 | ||
288 | The buffer is made read-only so that normal Emacs commands cannot | |
289 | modify it. | |
290 | ||
291 | The most useful commands are: | |
292 | \\<decipher-mode-map> | |
293 | \\[decipher-digram-list] Display a list of all digrams & their frequency | |
294 | \\[decipher-frequency-count] Display the frequency of each ciphertext letter | |
295 | \\[decipher-adjacency-list]\ | |
296 | Show adjacency list for current letter (lists letters appearing next to it) | |
297 | \\[decipher-make-checkpoint] Save the current cipher alphabet (checkpoint) | |
298 | \\[decipher-restore-checkpoint] Restore a saved cipher alphabet (checkpoint)" | |
299 | (interactive) | |
300 | (kill-all-local-variables) | |
301 | (setq buffer-undo-list t ;Disable undo | |
302 | indent-tabs-mode nil ;Do not use tab characters | |
303 | major-mode 'decipher-mode | |
304 | mode-name "Decipher") | |
305 | (if decipher-force-uppercase | |
306 | (setq case-fold-search nil)) ;Case is significant when searching | |
307 | (use-local-map decipher-mode-map) | |
308 | (set-syntax-table decipher-mode-syntax-table) | |
b64e4650 RS |
309 | (unless (= (point-min) (point-max)) |
310 | (decipher-read-alphabet)) | |
a378799a KH |
311 | (set (make-local-variable 'font-lock-defaults) |
312 | '(decipher-font-lock-keywords t)) | |
c10902fb | 313 | ;; Make the buffer writable when we exit Decipher mode: |
c10902fb RS |
314 | (add-hook 'change-major-mode-hook |
315 | (lambda () (setq buffer-read-only nil | |
316 | buffer-undo-list nil)) | |
317 | nil t) | |
c83c9654 | 318 | (run-mode-hooks 'decipher-mode-hook) |
c10902fb RS |
319 | (setq buffer-read-only t)) |
320 | (put 'decipher-mode 'mode-class 'special) | |
321 | ||
322 | ;;-------------------------------------------------------------------- | |
323 | ;; Normal key handling: | |
324 | ;;-------------------------------------------------------------------- | |
325 | ||
326 | (defmacro decipher-last-command-char () | |
327 | ;; Return the char which ran this command (for compatibility with XEmacs) | |
328 | (if (fboundp 'event-to-character) | |
329 | '(event-to-character last-command-event) | |
330 | 'last-command-event)) | |
331 | ||
332 | (defun decipher-keypress () | |
333 | "Enter a plaintext or ciphertext character." | |
334 | (interactive) | |
335 | (let ((decipher-function 'decipher-set-map) | |
336 | buffer-read-only) ;Make buffer writable | |
337 | (save-excursion | |
338 | (or (save-excursion | |
339 | (beginning-of-line) | |
340 | (let ((first-char (following-char))) | |
341 | (cond | |
342 | ((= ?: first-char) | |
343 | t) | |
344 | ((= ?> first-char) | |
345 | nil) | |
346 | ((= ?\( first-char) | |
347 | (setq decipher-function 'decipher-alphabet-keypress) | |
348 | t) | |
349 | ((= ?\) first-char) | |
350 | (setq decipher-function 'decipher-alphabet-keypress) | |
351 | nil) | |
352 | (t | |
353 | (error "Bad location"))))) | |
354 | (let (goal-column) | |
355 | (previous-line 1))) | |
356 | (let ((char-a (following-char)) | |
357 | (char-b (decipher-last-command-char))) | |
358 | (or (and (not (= ?w (char-syntax char-a))) | |
359 | (= char-b ?\ )) ;Spacebar just advances on non-letters | |
360 | (funcall decipher-function char-a char-b))))) | |
361 | (forward-char)) | |
362 | ||
363 | (defun decipher-alphabet-keypress (a b) | |
364 | ;; Handle keypresses in the alphabet lines. | |
365 | ;; A is the character in the alphabet row (which starts with '(') | |
366 | ;; B is the character pressed | |
367 | (cond ((and (>= a ?A) (<= a ?Z)) | |
368 | ;; If A is uppercase, then it is in the ciphertext alphabet: | |
369 | (decipher-set-map a b)) | |
370 | ((and (>= a ?a) (<= a ?z)) | |
371 | ;; If A is lowercase, then it is in the plaintext alphabet: | |
372 | (if (= b ?\ ) | |
373 | ;; We are clearing the association (if any): | |
374 | (if (/= ?\ (setq b (cdr (assoc a decipher-alphabet)))) | |
375 | (decipher-set-map b ?\ )) | |
376 | ;; Associate the plaintext char with the char pressed: | |
377 | (decipher-set-map b a))) | |
378 | (t | |
379 | ;; If A is not a letter, that's a problem: | |
380 | (error "Bad character")))) | |
381 | ||
382 | ;;-------------------------------------------------------------------- | |
383 | ;; Undo: | |
384 | ;;-------------------------------------------------------------------- | |
385 | ||
386 | (defun decipher-undo () | |
387 | "Undo a change in Decipher mode." | |
388 | (interactive) | |
389 | ;; If we don't get all the way thru, make last-command indicate that | |
390 | ;; for the following command. | |
391 | (setq this-command t) | |
392 | (or (eq major-mode 'decipher-mode) | |
393 | (error "This buffer is not in Decipher mode")) | |
394 | (or (eq last-command 'decipher-undo) | |
395 | (setq decipher-pending-undo-list decipher-undo-list)) | |
396 | (or decipher-pending-undo-list | |
397 | (error "No further undo information")) | |
398 | (let ((undo-rec (pop decipher-pending-undo-list)) | |
399 | buffer-read-only ;Make buffer writable | |
400 | redo-map redo-rec undo-map) | |
401 | (or (consp (car undo-rec)) | |
402 | (setq undo-rec (list undo-rec))) | |
403 | (while (setq undo-map (pop undo-rec)) | |
404 | (setq redo-map (decipher-get-undo (cdr undo-map) (car undo-map))) | |
405 | (if redo-map | |
406 | (setq redo-rec | |
407 | (if (consp (car redo-map)) | |
408 | (append redo-map redo-rec) | |
409 | (cons redo-map redo-rec)))) | |
410 | (decipher-set-map (cdr undo-map) (car undo-map) t)) | |
411 | (decipher-add-undo redo-rec)) | |
412 | (setq this-command 'decipher-undo) | |
413 | (message "Undo!")) | |
414 | ||
415 | (defun decipher-add-undo (undo-rec) | |
416 | "Add UNDO-REC to the undo list." | |
417 | (if undo-rec | |
418 | (progn | |
419 | (push undo-rec decipher-undo-list) | |
420 | (incf decipher-undo-list-size) | |
421 | (if (> decipher-undo-list-size decipher-undo-limit) | |
422 | (let ((new-size (- decipher-undo-limit 100))) | |
423 | ;; Truncate undo list to NEW-SIZE elements: | |
424 | (setcdr (nthcdr (1- new-size) decipher-undo-list) nil) | |
425 | (setq decipher-undo-list-size new-size)))))) | |
426 | ||
93ce34bf | 427 | (defun decipher-copy-cons (cons) |
4f2c8fbb RS |
428 | (if cons |
429 | (cons (car cons) (cdr cons)))) | |
430 | ||
c10902fb RS |
431 | (defun decipher-get-undo (cipher-char plain-char) |
432 | ;; Return an undo record that will undo the result of | |
433 | ;; (decipher-set-map CIPHER-CHAR PLAIN-CHAR) | |
4f2c8fbb | 434 | ;; We must copy the cons cell because the original cons cells will be |
c10902fb | 435 | ;; modified using setcdr. |
93ce34bf RS |
436 | (let ((cipher-map (decipher-copy-cons (rassoc cipher-char decipher-alphabet))) |
437 | (plain-map (decipher-copy-cons (assoc plain-char decipher-alphabet)))) | |
c10902fb RS |
438 | (cond ((equal ?\ plain-char) |
439 | cipher-map) | |
440 | ((equal cipher-char (cdr plain-map)) | |
441 | nil) ;We aren't changing anything | |
442 | ((equal ?\ (cdr plain-map)) | |
443 | (or cipher-map (cons ?\ cipher-char))) | |
444 | (cipher-map | |
445 | (list plain-map cipher-map)) | |
446 | (t | |
447 | plain-map)))) | |
448 | ||
449 | ;;-------------------------------------------------------------------- | |
450 | ;; Mapping ciphertext and plaintext: | |
451 | ;;-------------------------------------------------------------------- | |
452 | ||
453 | (defun decipher-set-map (cipher-char plain-char &optional no-undo) | |
454 | ;; Associate a ciphertext letter with a plaintext letter | |
455 | ;; CIPHER-CHAR must be an uppercase or lowercase letter | |
456 | ;; PLAIN-CHAR must be a lowercase letter (or a space) | |
457 | ;; NO-UNDO if non-nil means do not record undo information | |
458 | ;; Any existing associations for CIPHER-CHAR or PLAIN-CHAR will be erased. | |
459 | (setq cipher-char (upcase cipher-char)) | |
460 | (or (and (>= cipher-char ?A) (<= cipher-char ?Z)) | |
461 | (error "Bad character")) ;Cipher char must be uppercase letter | |
462 | (or no-undo | |
463 | (decipher-add-undo (decipher-get-undo cipher-char plain-char))) | |
464 | (let ((cipher-string (char-to-string cipher-char)) | |
465 | (plain-string (char-to-string plain-char)) | |
466 | case-fold-search ;Case is significant | |
467 | mapping bound) | |
468 | (save-excursion | |
469 | (goto-char (point-min)) | |
470 | (if (setq mapping (rassoc cipher-char decipher-alphabet)) | |
471 | (progn | |
472 | (setcdr mapping ?\ ) | |
473 | (search-forward-regexp (concat "^([a-z]*" | |
474 | (char-to-string (car mapping)))) | |
475 | (decipher-insert ?\ ) | |
476 | (beginning-of-line))) | |
477 | (if (setq mapping (assoc plain-char decipher-alphabet)) | |
478 | (progn | |
479 | (if (/= ?\ (cdr mapping)) | |
480 | (decipher-set-map (cdr mapping) ?\ t)) | |
481 | (setcdr mapping cipher-char) | |
482 | (search-forward-regexp (concat "^([a-z]*" plain-string)) | |
40600c94 | 483 | (decipher-insert cipher-char) |
c10902fb RS |
484 | (beginning-of-line))) |
485 | (search-forward-regexp (concat "^([a-z]+ [A-Z]*" cipher-string)) | |
40600c94 | 486 | (decipher-insert plain-char) |
c10902fb RS |
487 | (setq case-fold-search t ;Case is not significant |
488 | cipher-string (downcase cipher-string)) | |
40600c94 RS |
489 | (let ((font-lock-fontify-region-function 'ignore)) |
490 | ;; insert-and-inherit will pick the right face automatically | |
491 | (while (search-forward-regexp "^:" nil t) | |
492 | (setq bound (save-excursion (end-of-line) (point))) | |
493 | (while (search-forward cipher-string bound 'end) | |
494 | (decipher-insert plain-char))))))) | |
c10902fb RS |
495 | |
496 | (defun decipher-insert (char) | |
497 | ;; Insert CHAR in the row below point. It replaces any existing | |
498 | ;; character in that position. | |
499 | (let ((col (1- (current-column)))) | |
500 | (save-excursion | |
501 | (forward-line) | |
502 | (or (= ?\> (following-char)) | |
503 | (= ?\) (following-char)) | |
504 | (error "Bad location")) | |
505 | (move-to-column col t) | |
506 | (or (eolp) | |
507 | (delete-char 1)) | |
a378799a | 508 | (insert-and-inherit char)))) |
c10902fb RS |
509 | |
510 | ;;-------------------------------------------------------------------- | |
511 | ;; Checkpoints: | |
512 | ;;-------------------------------------------------------------------- | |
513 | ;; A checkpoint is a comment of the form: | |
514 | ;; %!ABCDEFGHIJKLMNOPQRSTUVWXYZ! Description | |
515 | ;; Such comments are usually placed at the end of the buffer following | |
516 | ;; this header (which is inserted by decipher-make-checkpoint): | |
517 | ;; %--------------------------- | |
518 | ;; % Checkpoints: | |
519 | ;; % abcdefghijklmnopqrstuvwxyz | |
520 | ;; but this is not required; checkpoints can be placed anywhere. | |
521 | ;; | |
522 | ;; The description is optional; all that is required is the alphabet. | |
523 | ||
524 | (defun decipher-make-checkpoint (desc) | |
525 | "Checkpoint the current cipher alphabet. | |
526 | This records the current alphabet so you can return to it later. | |
527 | You may have any number of checkpoints. | |
528 | Type `\\[decipher-restore-checkpoint]' to restore a checkpoint." | |
529 | (interactive "sCheckpoint description: ") | |
530 | (or (stringp desc) | |
531 | (setq desc "")) | |
532 | (let (alphabet | |
533 | buffer-read-only ;Make buffer writable | |
534 | mapping) | |
535 | (goto-char (point-min)) | |
536 | (re-search-forward "^)") | |
537 | (move-to-column 27 t) | |
538 | (setq alphabet (buffer-substring-no-properties (- (point) 26) (point))) | |
539 | (if (re-search-forward "^%![A-Z ]+!" nil 'end) | |
540 | nil ; Add new checkpoint with others | |
541 | (if (re-search-backward "^% *Local Variables:" nil t) | |
542 | ;; Add checkpoints before local variables list: | |
543 | (progn (forward-line -1) | |
544 | (or (looking-at "^ *$") | |
545 | (progn (forward-line) (insert ?\n) (forward-line -1))))) | |
546 | (insert "\n%" (make-string 69 ?\-) | |
547 | "\n% Checkpoints:\n% abcdefghijklmnopqrstuvwxyz\n")) | |
548 | (beginning-of-line) | |
40600c94 | 549 | (insert "%!" alphabet "! " desc ?\n))) |
c10902fb RS |
550 | |
551 | (defun decipher-restore-checkpoint () | |
552 | "Restore the cipher alphabet from a checkpoint. | |
553 | If point is not on a checkpoint line, moves to the first checkpoint line. | |
554 | If point is on a checkpoint, restores that checkpoint. | |
555 | ||
556 | Type `\\[decipher-make-checkpoint]' to make a checkpoint." | |
557 | (interactive) | |
558 | (beginning-of-line) | |
559 | (if (looking-at "%!\\([A-Z ]+\\)!") | |
560 | ;; Restore this checkpoint: | |
561 | (let ((alphabet (match-string 1)) | |
562 | buffer-read-only) ;Make buffer writable | |
563 | (goto-char (point-min)) | |
564 | (re-search-forward "^)") | |
565 | (or (eolp) | |
566 | (delete-region (point) (progn (end-of-line) (point)))) | |
567 | (insert alphabet) | |
568 | (decipher-resync)) | |
569 | ;; Move to the first checkpoint: | |
570 | (goto-char (point-min)) | |
571 | (if (re-search-forward "^%![A-Z ]+!" nil t) | |
572 | (message "Select the checkpoint to restore and type `%s'" | |
573 | (substitute-command-keys "\\[decipher-restore-checkpoint]")) | |
574 | (error "No checkpoints in this buffer")))) | |
575 | ||
576 | ;;-------------------------------------------------------------------- | |
577 | ;; Miscellaneous commands: | |
578 | ;;-------------------------------------------------------------------- | |
579 | ||
580 | (defun decipher-complete-alphabet () | |
581 | "Complete the cipher alphabet. | |
582 | This fills any blanks in the cipher alphabet with the unused letters | |
583 | in alphabetical order. Use this when you have a keyword cipher and | |
584 | you have determined the keyword." | |
585 | (interactive) | |
586 | (let ((cipher-char ?A) | |
587 | (ptr decipher-alphabet) | |
588 | buffer-read-only ;Make buffer writable | |
589 | plain-map undo-rec) | |
590 | (while (setq plain-map (pop ptr)) | |
591 | (if (equal ?\ (cdr plain-map)) | |
592 | (progn | |
593 | (while (rassoc cipher-char decipher-alphabet) | |
594 | ;; Find the next unused letter | |
595 | (incf cipher-char)) | |
596 | (push (cons ?\ cipher-char) undo-rec) | |
597 | (decipher-set-map cipher-char (car plain-map) t)))) | |
598 | (decipher-add-undo undo-rec))) | |
599 | ||
600 | (defun decipher-show-alphabet () | |
601 | "Display the current cipher alphabet in the message line." | |
602 | (interactive) | |
8c307e0f | 603 | (message "%s" |
c10902fb RS |
604 | (mapconcat (lambda (a) |
605 | (concat | |
606 | (char-to-string (car a)) | |
607 | (char-to-string (cdr a)))) | |
608 | decipher-alphabet | |
609 | ""))) | |
610 | ||
611 | (defun decipher-resync () | |
612 | "Reprocess the buffer using the alphabet from the top. | |
613 | This regenerates all deciphered plaintext and clears the undo list. | |
614 | You should use this if you edit the ciphertext." | |
615 | (interactive) | |
616 | (message "Reprocessing buffer...") | |
617 | (let (alphabet | |
618 | buffer-read-only ;Make buffer writable | |
619 | mapping) | |
620 | (save-excursion | |
621 | (decipher-read-alphabet) | |
622 | (setq alphabet decipher-alphabet) | |
623 | (goto-char (point-min)) | |
40600c94 | 624 | (and (re-search-forward "^).+" nil t) |
c10902fb | 625 | (replace-match ")" nil nil)) |
40600c94 | 626 | (while (re-search-forward "^>.+" nil t) |
c10902fb RS |
627 | (replace-match ">" nil nil)) |
628 | (decipher-read-alphabet) | |
629 | (while (setq mapping (pop alphabet)) | |
630 | (or (equal ?\ (cdr mapping)) | |
631 | (decipher-set-map (cdr mapping) (car mapping)))))) | |
632 | (setq decipher-undo-list nil | |
633 | decipher-undo-list-size 0) | |
634 | (message "Reprocessing buffer...done")) | |
635 | ||
636 | ;;-------------------------------------------------------------------- | |
637 | ;; Miscellaneous functions: | |
638 | ;;-------------------------------------------------------------------- | |
639 | ||
640 | (defun decipher-read-alphabet () | |
641 | "Build the decipher-alphabet from the alphabet line in the buffer." | |
642 | (save-excursion | |
643 | (goto-char (point-min)) | |
644 | (search-forward-regexp "^)") | |
645 | (move-to-column 27 t) | |
646 | (setq decipher-alphabet nil) | |
647 | (let ((plain-char ?z)) | |
648 | (while (>= plain-char ?a) | |
649 | (backward-char) | |
650 | (push (cons plain-char (following-char)) decipher-alphabet) | |
651 | (decf plain-char))))) | |
652 | ||
653 | ;;;=================================================================== | |
654 | ;;; Analyzing ciphertext: | |
655 | ;;;=================================================================== | |
656 | ||
657 | (defun decipher-frequency-count () | |
658 | "Display the frequency count in the statistics buffer." | |
659 | (interactive) | |
660 | (decipher-analyze) | |
661 | (decipher-display-regexp "^A" "^[A-Z][A-Z]")) | |
662 | ||
663 | (defun decipher-digram-list () | |
664 | "Display the list of digrams in the statistics buffer." | |
665 | (interactive) | |
666 | (decipher-analyze) | |
667 | (decipher-display-regexp "[A-Z][A-Z] +[0-9]" "^$")) | |
668 | ||
669 | (defun decipher-adjacency-list (cipher-char) | |
670 | "Display the adjacency list for the letter at point. | |
671 | The adjacency list shows all letters which come next to CIPHER-CHAR. | |
672 | ||
673 | An adjacency list (for the letter X) looks like this: | |
674 | 1 1 1 1 1 3 2 1 3 8 | |
675 | X: 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 * 11 14 9% | |
676 | 1 1 1 2 1 1 2 5 7 | |
677 | This says that X comes before D once, and after B once. X begins 5 | |
678 | words, and ends 3 words (`*' represents a space). X comes before 8 | |
679 | different letters, after 7 differerent letters, and is next to a total | |
680 | of 11 different letters. It occurs 14 times, making up 9% of the | |
681 | ciphertext." | |
682 | (interactive (list (upcase (following-char)))) | |
683 | (decipher-analyze) | |
684 | (let (start end) | |
685 | (save-excursion | |
686 | (set-buffer (decipher-stats-buffer)) | |
687 | (goto-char (point-min)) | |
688 | (or (re-search-forward (format "^%c: " cipher-char) nil t) | |
6e44da43 | 689 | (error "Character `%c' is not used in ciphertext" cipher-char)) |
c10902fb RS |
690 | (forward-line -1) |
691 | (setq start (point)) | |
692 | (forward-line 3) | |
693 | (setq end (point))) | |
694 | (decipher-display-range start end))) | |
695 | ||
696 | ;;-------------------------------------------------------------------- | |
697 | (defun decipher-analyze () | |
698 | "Perform frequency analysis on the current buffer if necessary." | |
699 | (cond | |
700 | ;; If this is the statistics buffer, do nothing: | |
701 | ((eq major-mode 'decipher-stats-mode)) | |
702 | ;; If this is the Decipher buffer, see if the stats buffer exists: | |
703 | ((eq major-mode 'decipher-mode) | |
704 | (or (and (bufferp decipher-stats-buffer) | |
705 | (buffer-name decipher-stats-buffer)) | |
706 | (decipher-analyze-buffer))) | |
707 | ;; Otherwise: | |
708 | (t (error "This buffer is not in Decipher mode")))) | |
709 | ||
710 | ;;-------------------------------------------------------------------- | |
711 | (defun decipher-display-range (start end) | |
712 | "Display text between START and END in the statistics buffer. | |
713 | START and END are positions in the statistics buffer. Makes the | |
714 | statistics buffer visible and sizes the window to just fit the | |
715 | displayed text, but leaves the current window selected." | |
716 | (let ((stats-buffer (decipher-stats-buffer)) | |
717 | (current-window (selected-window)) | |
718 | (pop-up-windows t)) | |
719 | (or (eq (current-buffer) stats-buffer) | |
720 | (pop-to-buffer stats-buffer)) | |
721 | (goto-char start) | |
722 | (or (one-window-p t) | |
723 | (enlarge-window (- (1+ (count-lines start end)) (window-height)))) | |
724 | (recenter 0) | |
725 | (select-window current-window))) | |
726 | ||
727 | (defun decipher-display-regexp (start-regexp end-regexp) | |
728 | "Display text between two regexps in the statistics buffer. | |
729 | ||
730 | START-REGEXP matches the first line to display. | |
731 | END-REGEXP matches the line after that which ends the display. | |
732 | The ending line is included in the display unless it is blank." | |
733 | (let (start end) | |
734 | (save-excursion | |
735 | (set-buffer (decipher-stats-buffer)) | |
736 | (goto-char (point-min)) | |
737 | (re-search-forward start-regexp) | |
738 | (beginning-of-line) | |
739 | (setq start (point)) | |
740 | (re-search-forward end-regexp) | |
741 | (beginning-of-line) | |
742 | (or (looking-at "^ *$") | |
743 | (forward-line 1)) | |
744 | (setq end (point))) | |
745 | (decipher-display-range start end))) | |
746 | ||
747 | ;;-------------------------------------------------------------------- | |
748 | (defun decipher-loop-with-breaks (func) | |
749 | "Loop through ciphertext, calling FUNC once for each letter & word division. | |
750 | ||
751 | FUNC is called with no arguments, and its return value is unimportant. | |
752 | It may examine `decipher-char' to see the current ciphertext | |
753 | character. `decipher-char' contains either an uppercase letter or a space. | |
754 | ||
755 | FUNC is called exactly once between words, with `decipher-char' set to | |
756 | a space. | |
757 | ||
758 | See `decipher-loop-no-breaks' if you do not care about word divisions." | |
759 | (let ((decipher-char ?\ ) | |
760 | (decipher--loop-prev-char ?\ )) | |
761 | (save-excursion | |
762 | (goto-char (point-min)) | |
763 | (funcall func) ;Space marks beginning of first word | |
764 | (while (search-forward-regexp "^:" nil t) | |
765 | (while (not (eolp)) | |
766 | (setq decipher-char (upcase (following-char))) | |
767 | (or (and (>= decipher-char ?A) (<= decipher-char ?Z)) | |
768 | (setq decipher-char ?\ )) | |
769 | (or (and (equal decipher-char ?\ ) | |
770 | (equal decipher--loop-prev-char ?\ )) | |
771 | (funcall func)) | |
772 | (setq decipher--loop-prev-char decipher-char) | |
773 | (forward-char)) | |
774 | (or (equal decipher-char ?\ ) | |
775 | (progn | |
e0b3c2b9 | 776 | (setq decipher-char ?\s |
c10902fb RS |
777 | decipher--loop-prev-char ?\ ) |
778 | (funcall func))))))) | |
779 | ||
780 | (defun decipher-loop-no-breaks (func) | |
781 | "Loop through ciphertext, calling FUNC once for each letter. | |
782 | ||
783 | FUNC is called with no arguments, and its return value is unimportant. | |
784 | It may examine `decipher-char' to see the current ciphertext letter. | |
785 | `decipher-char' contains an uppercase letter. | |
786 | ||
787 | Punctuation and spacing in the ciphertext are ignored. | |
788 | See `decipher-loop-with-breaks' if you care about word divisions." | |
789 | (let (decipher-char) | |
790 | (save-excursion | |
791 | (goto-char (point-min)) | |
792 | (while (search-forward-regexp "^:" nil t) | |
793 | (while (not (eolp)) | |
794 | (setq decipher-char (upcase (following-char))) | |
795 | (and (>= decipher-char ?A) | |
796 | (<= decipher-char ?Z) | |
797 | (funcall func)) | |
798 | (forward-char)))))) | |
799 | ||
800 | ;;-------------------------------------------------------------------- | |
801 | ;; Perform the analysis: | |
802 | ;;-------------------------------------------------------------------- | |
803 | ||
804 | (defun decipher-insert-frequency-counts (freq-list total) | |
805 | "Insert frequency counts in current buffer. | |
806 | Each element of FREQ-LIST is a list (LETTER FREQ ...). | |
807 | TOTAL is the total number of letters in the ciphertext." | |
808 | (let ((i 4) temp-list) | |
809 | (while (> i 0) | |
810 | (setq temp-list freq-list) | |
811 | (while temp-list | |
812 | (insert (caar temp-list) | |
813 | (format "%4d%3d%% " | |
814 | (cadar temp-list) | |
815 | (/ (* 100 (cadar temp-list)) total))) | |
816 | (setq temp-list (nthcdr 4 temp-list))) | |
817 | (insert ?\n) | |
818 | (setq freq-list (cdr freq-list) | |
819 | i (1- i))))) | |
820 | ||
821 | (defun decipher--analyze () | |
822 | ;; Perform frequency analysis on ciphertext. | |
823 | ;; | |
824 | ;; This function is called repeatedly with decipher-char set to each | |
ddfb0a34 | 825 | ;; character of ciphertext. It uses decipher--prev-char to remember |
c10902fb RS |
826 | ;; the previous ciphertext character. |
827 | ;; | |
828 | ;; It builds several data structures, which must be initialized | |
829 | ;; before the first call to decipher--analyze. The arrays are | |
830 | ;; indexed with A = 0, B = 1, ..., Z = 25, SPC = 26 (if used). | |
ddfb0a34 | 831 | ;; decipher--after: (initialize to zeros) |
c10902fb RS |
832 | ;; A vector of 26 vectors of 27 integers. The first vector |
833 | ;; represents the number of times A follows each character, the | |
834 | ;; second vector represents B, and so on. | |
ddfb0a34 KH |
835 | ;; decipher--before: (initialize to zeros) |
836 | ;; The same as decipher--after, but representing the number of | |
837 | ;; times the character precedes each other character. | |
838 | ;; decipher--digram-list: (initialize to nil) | |
c10902fb RS |
839 | ;; An alist with an entry for each digram (2-character sequence) |
840 | ;; encountered. Each element is a cons cell (DIGRAM . FREQ), | |
841 | ;; where DIGRAM is a 2 character string and FREQ is the number | |
842 | ;; of times it occurs. | |
ddfb0a34 | 843 | ;; decipher--freqs: (initialize to zeros) |
c10902fb RS |
844 | ;; A vector of 26 integers, counting the number of occurrences |
845 | ;; of the corresponding characters. | |
ddfb0a34 KH |
846 | (setq decipher--digram (format "%c%c" decipher--prev-char decipher-char)) |
847 | (incf (cdr (or (assoc decipher--digram decipher--digram-list) | |
848 | (car (push (cons decipher--digram 0) | |
849 | decipher--digram-list))))) | |
850 | (and (>= decipher--prev-char ?A) | |
851 | (incf (aref (aref decipher--before (- decipher--prev-char ?A)) | |
c10902fb RS |
852 | (if (equal decipher-char ?\ ) |
853 | 26 | |
854 | (- decipher-char ?A))))) | |
855 | (and (>= decipher-char ?A) | |
ddfb0a34 KH |
856 | (incf (aref decipher--freqs (- decipher-char ?A))) |
857 | (incf (aref (aref decipher--after (- decipher-char ?A)) | |
858 | (if (equal decipher--prev-char ?\ ) | |
c10902fb | 859 | 26 |
ddfb0a34 KH |
860 | (- decipher--prev-char ?A))))) |
861 | (setq decipher--prev-char decipher-char)) | |
c10902fb RS |
862 | |
863 | (defun decipher--digram-counts (counts) | |
864 | "Generate the counts for an adjacency list." | |
865 | (let ((total 0)) | |
866 | (concat | |
867 | (mapconcat (lambda (x) | |
868 | (cond ((> x 99) (incf total) "XX") | |
869 | ((> x 0) (incf total) (format "%2d" x)) | |
870 | (t " "))) | |
871 | counts | |
872 | "") | |
873 | (format "%4d" (if (> (aref counts 26) 0) | |
874 | (1- total) ;Don't count space | |
875 | total))))) | |
876 | ||
877 | (defun decipher--digram-total (before-count after-count) | |
878 | "Count the number of different letters a letter appears next to." | |
879 | ;; We do not include spaces (word divisions) in this count. | |
880 | (let ((total 0) | |
881 | (i 26)) | |
882 | (while (>= (decf i) 0) | |
883 | (if (or (> (aref before-count i) 0) | |
884 | (> (aref after-count i) 0)) | |
885 | (incf total))) | |
886 | total)) | |
887 | ||
888 | (defun decipher-analyze-buffer () | |
889 | "Perform frequency analysis and store results in statistics buffer. | |
890 | Creates the statistics buffer if it doesn't exist." | |
ddfb0a34 KH |
891 | (let ((decipher--prev-char (if decipher-ignore-spaces ?\ ?\*)) |
892 | (decipher--before (make-vector 26 nil)) | |
893 | (decipher--after (make-vector 26 nil)) | |
894 | (decipher--freqs (make-vector 26 0)) | |
c10902fb | 895 | (total-chars 0) |
ddfb0a34 | 896 | decipher--digram decipher--digram-list freq-list) |
c10902fb RS |
897 | (message "Scanning buffer...") |
898 | (let ((i 26)) | |
899 | (while (>= (decf i) 0) | |
ddfb0a34 KH |
900 | (aset decipher--before i (make-vector 27 0)) |
901 | (aset decipher--after i (make-vector 27 0)))) | |
c10902fb RS |
902 | (if decipher-ignore-spaces |
903 | (progn | |
904 | (decipher-loop-no-breaks 'decipher--analyze) | |
905 | ;; The first character of ciphertext was marked as following a space: | |
906 | (let ((i 26)) | |
907 | (while (>= (decf i) 0) | |
ddfb0a34 | 908 | (aset (aref decipher--after i) 26 0)))) |
c10902fb RS |
909 | (decipher-loop-with-breaks 'decipher--analyze)) |
910 | (message "Processing results...") | |
ddfb0a34 | 911 | (setcdr (last decipher--digram-list 2) nil) ;Delete the phony "* " digram |
c10902fb | 912 | ;; Sort the digram list by frequency and alphabetical order: |
ddfb0a34 | 913 | (setq decipher--digram-list (sort (sort decipher--digram-list |
c10902fb RS |
914 | (lambda (a b) (string< (car a) (car b)))) |
915 | (lambda (a b) (> (cdr a) (cdr b))))) | |
916 | ;; Generate the frequency list: | |
917 | ;; Each element is a list of 3 elements (LETTER FREQ DIFFERENT), | |
918 | ;; where LETTER is the ciphertext character, FREQ is the number | |
919 | ;; of times it occurs, and DIFFERENT is the number of different | |
920 | ;; letters it appears next to. | |
921 | (let ((i 26)) | |
922 | (while (>= (decf i) 0) | |
923 | (setq freq-list | |
924 | (cons (list (+ i ?A) | |
ddfb0a34 KH |
925 | (aref decipher--freqs i) |
926 | (decipher--digram-total (aref decipher--before i) | |
927 | (aref decipher--after i))) | |
c10902fb | 928 | freq-list) |
ddfb0a34 | 929 | total-chars (+ total-chars (aref decipher--freqs i))))) |
c10902fb RS |
930 | (save-excursion |
931 | ;; Switch to statistics buffer, creating it if necessary: | |
932 | (set-buffer (decipher-stats-buffer t)) | |
933 | ;; This can't happen, but it never hurts to double-check: | |
934 | (or (eq major-mode 'decipher-stats-mode) | |
935 | (error "Buffer %s is not in Decipher-Stats mode" (buffer-name))) | |
936 | (setq buffer-read-only nil) | |
937 | (erase-buffer) | |
938 | ;; Display frequency counts for letters A-Z: | |
939 | (decipher-insert-frequency-counts freq-list total-chars) | |
940 | (insert ?\n) | |
941 | ;; Display frequency counts for letters in order of frequency: | |
942 | (setq freq-list (sort freq-list | |
943 | (lambda (a b) (> (second a) (second b))))) | |
944 | (decipher-insert-frequency-counts freq-list total-chars) | |
945 | ;; Display letters in order of frequency: | |
946 | (insert ?\n (mapconcat (lambda (a) (char-to-string (car a))) | |
947 | freq-list nil) | |
948 | "\n\n") | |
949 | ;; Display list of digrams in order of frequency: | |
ddfb0a34 | 950 | (let* ((rows (floor (+ (length decipher--digram-list) 9) 10)) |
c10902fb RS |
951 | (i rows) |
952 | temp-list) | |
953 | (while (> i 0) | |
ddfb0a34 | 954 | (setq temp-list decipher--digram-list) |
c10902fb RS |
955 | (while temp-list |
956 | (insert (caar temp-list) | |
957 | (format "%3d " | |
958 | (cdar temp-list))) | |
959 | (setq temp-list (nthcdr rows temp-list))) | |
960 | (delete-horizontal-space) | |
961 | (insert ?\n) | |
ddfb0a34 | 962 | (setq decipher--digram-list (cdr decipher--digram-list) |
c10902fb RS |
963 | i (1- i)))) |
964 | ;; Display adjacency list for each letter, sorted in descending | |
965 | ;; order of the number of adjacent letters: | |
966 | (setq freq-list (sort freq-list | |
967 | (lambda (a b) (> (third a) (third b))))) | |
968 | (let ((temp-list freq-list) | |
969 | entry i) | |
970 | (while (setq entry (pop temp-list)) | |
971 | (if (equal 0 (second entry)) | |
972 | nil ;This letter was not used | |
973 | (setq i (- (car entry) ?A)) | |
974 | (insert ?\n " " | |
ddfb0a34 | 975 | (decipher--digram-counts (aref decipher--before i)) ?\n |
c10902fb RS |
976 | (car entry) |
977 | ": 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 *" | |
978 | (format "%4d %4d %3d%%\n " | |
979 | (third entry) (second entry) | |
980 | (/ (* 100 (second entry)) total-chars)) | |
ddfb0a34 | 981 | (decipher--digram-counts (aref decipher--after i)) ?\n)))) |
c10902fb RS |
982 | (setq buffer-read-only t) |
983 | (set-buffer-modified-p nil) | |
984 | )) | |
985 | (message nil)) | |
986 | ||
987 | ;;==================================================================== | |
988 | ;; Statistics Buffer: | |
989 | ;;==================================================================== | |
990 | ||
991 | (defun decipher-stats-mode () | |
992 | "Major mode for displaying ciphertext statistics." | |
993 | (interactive) | |
994 | (kill-all-local-variables) | |
995 | (setq buffer-read-only t | |
996 | buffer-undo-list t ;Disable undo | |
997 | case-fold-search nil ;Case is significant when searching | |
998 | indent-tabs-mode nil ;Do not use tab characters | |
999 | major-mode 'decipher-stats-mode | |
1000 | mode-name "Decipher-Stats") | |
1001 | (use-local-map decipher-stats-mode-map) | |
c83c9654 | 1002 | (run-mode-hooks 'decipher-stats-mode-hook)) |
c10902fb RS |
1003 | (put 'decipher-stats-mode 'mode-class 'special) |
1004 | ||
1005 | ;;-------------------------------------------------------------------- | |
1006 | ||
1007 | (defun decipher-display-stats-buffer () | |
1008 | "Make the statistics buffer visible, but do not select it." | |
1009 | (let ((stats-buffer (decipher-stats-buffer)) | |
1010 | (current-window (selected-window))) | |
1011 | (or (eq (current-buffer) stats-buffer) | |
1012 | (progn | |
1013 | (pop-to-buffer stats-buffer) | |
1014 | (select-window current-window))))) | |
1015 | ||
1016 | (defun decipher-stats-buffer (&optional create) | |
1017 | "Return the buffer used for decipher statistics. | |
1018 | If CREATE is non-nil, create the buffer if it doesn't exist. | |
1019 | This is guaranteed to return a buffer in Decipher-Stats mode; | |
1020 | if it can't, it signals an error." | |
1021 | (cond | |
1022 | ;; We may already be in the statistics buffer: | |
1023 | ((eq major-mode 'decipher-stats-mode) | |
1024 | (current-buffer)) | |
1025 | ;; See if decipher-stats-buffer exists: | |
1026 | ((and (bufferp decipher-stats-buffer) | |
1027 | (buffer-name decipher-stats-buffer)) | |
1028 | (or (save-excursion | |
1029 | (set-buffer decipher-stats-buffer) | |
1030 | (eq major-mode 'decipher-stats-mode)) | |
1031 | (error "Buffer %s is not in Decipher-Stats mode" | |
1032 | (buffer-name decipher-stats-buffer))) | |
1033 | decipher-stats-buffer) | |
1034 | ;; Create a new buffer if requested: | |
1035 | (create | |
1036 | (let ((stats-name (concat "*" (buffer-name) "*"))) | |
1037 | (setq decipher-stats-buffer | |
1038 | (if (eq 'decipher-stats-mode | |
1039 | (cdr-safe (assoc 'major-mode | |
1040 | (buffer-local-variables | |
1041 | (get-buffer stats-name))))) | |
1042 | ;; We just lost track of the statistics buffer: | |
1043 | (get-buffer stats-name) | |
1044 | (generate-new-buffer stats-name)))) | |
1045 | (save-excursion | |
1046 | (set-buffer decipher-stats-buffer) | |
1047 | (decipher-stats-mode)) | |
1048 | decipher-stats-buffer) | |
1049 | ;; Give up: | |
1050 | (t (error "No statistics buffer")))) | |
1051 | ||
1052 | ;;==================================================================== | |
1053 | ||
1054 | (provide 'decipher) | |
1055 | ||
1056 | ;;;(defun decipher-show-undo-list () | |
1057 | ;;; "Display the undo list (for debugging purposes)." | |
1058 | ;;; (interactive) | |
1059 | ;;; (with-output-to-temp-buffer "*Decipher Undo*" | |
1060 | ;;; (let ((undo-list decipher-undo-list) | |
1061 | ;;; undo-rec undo-map) | |
1062 | ;;; (save-excursion | |
1063 | ;;; (set-buffer "*Decipher Undo*") | |
1064 | ;;; (while (setq undo-rec (pop undo-list)) | |
1065 | ;;; (or (consp (car undo-rec)) | |
1066 | ;;; (setq undo-rec (list undo-rec))) | |
1067 | ;;; (insert ?\() | |
1068 | ;;; (while (setq undo-map (pop undo-rec)) | |
1069 | ;;; (insert (cdr undo-map) (car undo-map) ?\ )) | |
1070 | ;;; (delete-backward-char 1) | |
1071 | ;;; (insert ")\n")))))) | |
1072 | ||
ab5796a9 | 1073 | ;;; arch-tag: 8f094d88-ffe1-4f99-afe3-a5e81dd939d9 |
c10902fb | 1074 | ;;; decipher.el ends here |