diff options
Diffstat (limited to 'lisp/play')
| -rw-r--r-- | lisp/play/decipher.el | 83 |
1 files changed, 79 insertions, 4 deletions
diff --git a/lisp/play/decipher.el b/lisp/play/decipher.el index fc78e83a966..f256a1494b4 100644 --- a/lisp/play/decipher.el +++ b/lisp/play/decipher.el @@ -38,6 +38,11 @@ ;;; Commentary: ;; +;; If you want Decipher to use its Font Lock mode, you should use +;; (setq decipher-use-font-lock t) +;; See the variable `decipher-use-font-lock' if you want to customize +;; the faces used. +;; ;; 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 @@ -86,6 +91,28 @@ (eval-when-compile (require 'cl)) +(eval-when-compile + (require 'font-lock)) + +(defvar decipher-use-font-lock (featurep 'font-lock) + "Non-nil means Decipher should use its Font Lock mode. +Do *not* turn on font-lock-mode yourself, it's too slow when used with +Decipher. Decipher contains special code to keep the buffer fontified +without using Font Lock mode directly. + +You should set this in your `.emacs' file or before loading Decipher; +use `\\[decipher-toggle-font-lock]' after Decipher is loaded. + +Ciphertext uses `font-lock-keyword-face', plaintext uses +`font-lock-string-face', comments use `font-lock-comment-face', and +checkpoints use `font-lock-reference-face'. + +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-force-uppercase t "*Non-nil means to convert ciphertext to uppercase. Nil means the case of the ciphertext is preserved. @@ -106,6 +133,19 @@ the tail of the list.") ;; End of user modifiable variables ;;-------------------------------------------------------------------- +(defvar decipher-font-lock-keywords + '(("^:.*\n" . font-lock-keyword-face) + ("^>.*\n" . font-lock-string-face) + ("^%!.*\n" . font-lock-reference-face) + ("^%.*\n" . font-lock-comment-face) + ("\\`(\\([a-z]+\\) +\\([A-Z]+\\).+ +)\\([A-Z ]*\\)\\([a-z ]*\\)" + (1 font-lock-string-face) + (2 font-lock-keyword-face) + (3 font-lock-keyword-face) + (4 font-lock-string-face))) + "Expressions to fontify in Decipher mode. +See the variable `decipher-use-font-lock'.") (defvar decipher-mode-map nil "Keymap for Decipher mode.") (if (not decipher-mode-map) @@ -259,13 +299,22 @@ The most useful commands are: (use-local-map decipher-mode-map) (set-syntax-table decipher-mode-syntax-table) (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) + ;; If someone turns on Font Lock, turn it off and use our code instead: + (make-local-hook 'font-lock-mode-hook) + (add-hook 'font-lock-mode-hook 'decipher-turn-on-font-lock t t) (run-hooks 'decipher-mode-hook) + (and decipher-use-font-lock + ;; Fontify buffer after calling the mode hooks, + ;; in case they change the font-lock variables: + (font-lock-fontify-buffer)) (setq buffer-read-only t)) (put 'decipher-mode 'mode-class 'special) @@ -426,10 +475,15 @@ The most useful commands are: (decipher-set-map (cdr mapping) ?\ t)) (setcdr mapping cipher-char) (search-forward-regexp (concat "^([a-z]*" plain-string)) - (decipher-insert cipher-char) + (and decipher-use-font-lock + (put-text-property 0 1 'face font-lock-keyword-face + cipher-string)) + (decipher-insert cipher-string) (beginning-of-line))) (search-forward-regexp (concat "^([a-z]+ [A-Z]*" cipher-string)) - (decipher-insert plain-char) + (and decipher-use-font-lock + (put-text-property 0 1 'face font-lock-string-face plain-string)) + (decipher-insert plain-string) (setq case-fold-search t ;Case is not significant cipher-string (downcase cipher-string)) (while (search-forward-regexp "^:" nil t) @@ -449,7 +503,7 @@ The most useful commands are: (move-to-column col t) (or (eolp) (delete-char 1)) - (insert char)))) + (insert-and-inherit char)))) ;;-------------------------------------------------------------------- ;; Checkpoints: @@ -490,7 +544,9 @@ Type `\\[decipher-restore-checkpoint]' to restore a checkpoint." (insert "\n%" (make-string 69 ?\-) "\n% Checkpoints:\n% abcdefghijklmnopqrstuvwxyz\n")) (beginning-of-line) - (insert "%!" alphabet "! " desc ?\n))) + (insert "%!" alphabet "! " desc ?\n)) + (and decipher-use-font-lock + (font-lock-fontify-buffer))) (defun decipher-restore-checkpoint () "Restore the cipher alphabet from a checkpoint. @@ -569,6 +625,8 @@ You should use this if you edit the ciphertext." (replace-match ")" nil nil)) (while (re-search-forward "^>.+$" nil t) (replace-match ">" nil nil)) + (and decipher-use-font-lock + (font-lock-fontify-buffer)) (decipher-read-alphabet) (while (setq mapping (pop alphabet)) (or (equal ?\ (cdr mapping)) @@ -577,6 +635,19 @@ You should use this if you edit the ciphertext." decipher-undo-list-size 0) (message "Reprocessing buffer...done")) +(defun decipher-toggle-font-lock (&optional arg) + "Toggle Decipher's Font Lock mode in the current buffer. +With arg, turn Font Lock mode on if and only if arg is positive. +See the variable `decipher-use-font-lock' for more information." + (interactive "P") + (or (eq major-mode 'decipher-mode) + (error "This buffer is not in Decipher mode")) + (let ((on-p (if arg (> (prefix-numeric-value arg) 0) + (not decipher-use-font-lock)))) + (if on-p (font-lock-fontify-buffer) + (font-lock-unfontify-region (point-min) (point-max))) + (make-local-variable 'decipher-use-font-lock) + (setq decipher-use-font-lock on-p))) ;;-------------------------------------------------------------------- ;; Miscellaneous functions: ;;-------------------------------------------------------------------- @@ -593,6 +664,10 @@ You should use this if you edit the ciphertext." (backward-char) (push (cons plain-char (following-char)) decipher-alphabet) (decf plain-char))))) +(defun decipher-turn-on-font-lock () + "Turn on Decipher's Font Lock code and turn off normal Font Lock mode." + (font-lock-mode 0) + (decipher-toggle-font-lock 1)) ;;;=================================================================== ;;; Analyzing ciphertext: |