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- ;;; mpuz.el --- multiplication puzzle for GNU Emacs
-
- ;; Copyright (C) 1990 Free Software Foundation, Inc.
-
- ;; Author: Philippe Schnoebelen <phs@lifia.imag.fr>
- ;; 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 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, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; When this package is loaded, `M-x mpuz' generates a random multiplication
- ;; puzzle. This is a multiplication example in which each digit has been
- ;; consistently replaced with some letter. Your job is to reconstruct
- ;; the original digits. Type `?' while the mode is active for detailed help.
-
- ;;; Code:
-
- (random t) ; randomize
-
- (defvar mpuz-silent nil
- "*Set this to T if you don't want dings on inputs.")
-
- (defun mpuz-ding ()
- "Dings, unless global variable `mpuz-silent' forbids it."
- (or mpuz-silent (ding t)))
-
-
- ;; Mpuz mode and keymaps
- ;;----------------------
- (defvar mpuz-mode-hook nil)
-
- (defvar mpuz-mode-map nil
- "Local keymap to use in Mult Puzzle.")
-
- (if mpuz-mode-map nil
- (setq mpuz-mode-map (make-sparse-keymap))
- (define-key mpuz-mode-map "a" 'mpuz-try-letter)
- (define-key mpuz-mode-map "b" 'mpuz-try-letter)
- (define-key mpuz-mode-map "c" 'mpuz-try-letter)
- (define-key mpuz-mode-map "d" 'mpuz-try-letter)
- (define-key mpuz-mode-map "e" 'mpuz-try-letter)
- (define-key mpuz-mode-map "f" 'mpuz-try-letter)
- (define-key mpuz-mode-map "g" 'mpuz-try-letter)
- (define-key mpuz-mode-map "h" 'mpuz-try-letter)
- (define-key mpuz-mode-map "i" 'mpuz-try-letter)
- (define-key mpuz-mode-map "j" 'mpuz-try-letter)
- (define-key mpuz-mode-map "A" 'mpuz-try-letter)
- (define-key mpuz-mode-map "B" 'mpuz-try-letter)
- (define-key mpuz-mode-map "C" 'mpuz-try-letter)
- (define-key mpuz-mode-map "D" 'mpuz-try-letter)
- (define-key mpuz-mode-map "E" 'mpuz-try-letter)
- (define-key mpuz-mode-map "F" 'mpuz-try-letter)
- (define-key mpuz-mode-map "G" 'mpuz-try-letter)
- (define-key mpuz-mode-map "H" 'mpuz-try-letter)
- (define-key mpuz-mode-map "I" 'mpuz-try-letter)
- (define-key mpuz-mode-map "J" 'mpuz-try-letter)
- (define-key mpuz-mode-map "\C-g" 'mpuz-offer-abort)
- (define-key mpuz-mode-map "?" 'describe-mode))
-
- (defun mpuz-mode ()
- "Multiplication puzzle mode.
-
- You have to guess which letters stand for which digits in the
- multiplication displayed inside the `*Mult Puzzle*' buffer.
-
- You may enter a guess for a letter's value by typing first the letter,
- then the digit. Thus, to guess that A=3, type A 3.
-
- To leave the game to do other editing work, just switch buffers.
- Then you may resume the game with M-x mpuz.
- You may abort a game by typing \\<mpuz-mode-map>\\[mpuz-offer-abort]."
- (interactive)
- (setq major-mode 'mpuz-mode
- mode-name "Mult Puzzle")
- (use-local-map mpuz-mode-map)
- (run-hooks 'mpuz-mode-hook))
-
-
- ;; Some variables for statistics
- ;;------------------------------
- (defvar mpuz-nb-errors 0
- "Number of errors made in current game.")
-
- (defvar mpuz-nb-completed-games 0
- "Number of games completed.")
-
- (defvar mpuz-nb-cumulated-errors 0
- "Number of errors made in previous games.")
-
-
- ;; Some variables for game tracking
- ;;---------------------------------
- (defvar mpuz-in-progress nil
- "True if a game is currently in progress.")
-
- (defvar mpuz-found-digits (make-vector 10 nil)
- "A vector recording which digits have been decrypted.")
-
- (defmacro mpuz-digit-solved-p (digit)
- (list 'aref 'mpuz-found-digits digit))
-
-
- ;; A puzzle uses a permutation of [0..9] into itself.
- ;; We use both the permutation and its inverse.
- ;;---------------------------------------------------
- (defvar mpuz-digit-to-letter (make-vector 10 0)
- "A permutation from [0..9] to [0..9].")
-
- (defvar mpuz-letter-to-digit (make-vector 10 0)
- "The inverse of mpuz-digit-to-letter.")
-
- (defmacro mpuz-to-digit (letter)
- (list 'aref 'mpuz-letter-to-digit letter))
-
- (defmacro mpuz-to-letter (digit)
- (list 'aref 'mpuz-digit-to-letter digit))
-
- (defun mpuz-build-random-perm ()
- "Initialize puzzle coding with a random permutation."
- (let ((letters (list 0 1 2 3 4 5 6 7 8 9)) ; new cons cells, because of delq
- (index 10)
- elem)
- (while letters
- (setq elem (nth (random index) letters)
- letters (delq elem letters)
- index (1- index))
- (aset mpuz-digit-to-letter index elem)
- (aset mpuz-letter-to-digit elem index))))
-
-
- ;; A puzzle also uses a board displaying a multiplication.
- ;; Every digit appears in the board, crypted or not.
- ;;------------------------------------------------------
- (defvar mpuz-board (make-vector 10 nil)
- "The board associates to any digit the list of squares where it appears.")
-
- (defun mpuz-put-digit-on-board (number square)
- "Put (last digit of) NUMBER on SQUARE of the puzzle board."
- ;; i.e. push SQUARE on NUMBER square-list
- (setq number (% number 10))
- (aset mpuz-board number (cons square (aref mpuz-board number))))
-
- (defun mpuz-check-all-solved ()
- "Check whether all digits have been solved. Return t if yes."
- (catch 'found
- (let ((digit -1))
- (while (> 10 (setq digit (1+ digit)))
- (if (and (not (mpuz-digit-solved-p digit)) ; unsolved
- (aref mpuz-board digit)) ; and appearing in the puzzle !
- (throw 'found nil))))
- t))
-
-
- ;; To build a puzzle, we take two random numbers and multiply them.
- ;; We also take a random permutation for encryption.
- ;; The random numbers are only use to see which digit appears in which square
- ;; of the board. Everything is stored in individual squares.
- ;;---------------------------------------------------------------------------
- (defun mpuz-random-puzzle ()
- "Draw random values to be multiplied in a puzzle."
- (mpuz-build-random-perm)
- (fillarray mpuz-board nil) ; erase the board
- (let (A B C D E)
- ;; A,B,C,D & E, are the five rows of our multiplication.
- ;; Choose random values, discarding uninteresting cases.
- (while (progn
- (setq A (random 1000)
- B (random 100)
- C (* A (% B 10))
- D (* A (/ B 10))
- E (* A B))
- (or (< C 1000) (< D 1000)))) ; forbid leading zeros in C or D
- ;; Individual digits are now put on their respective squares.
- ;; [NB: A square is a pair <row,column> of the screen.]
- (mpuz-put-digit-on-board A '(2 . 9))
- (mpuz-put-digit-on-board (/ A 10) '(2 . 7))
- (mpuz-put-digit-on-board (/ A 100) '(2 . 5))
- (mpuz-put-digit-on-board B '(4 . 9))
- (mpuz-put-digit-on-board (/ B 10) '(4 . 7))
- (mpuz-put-digit-on-board C '(6 . 9))
- (mpuz-put-digit-on-board (/ C 10) '(6 . 7))
- (mpuz-put-digit-on-board (/ C 100) '(6 . 5))
- (mpuz-put-digit-on-board (/ C 1000) '(6 . 3))
- (mpuz-put-digit-on-board D '(8 . 7))
- (mpuz-put-digit-on-board (/ D 10) '(8 . 5))
- (mpuz-put-digit-on-board (/ D 100) '(8 . 3))
- (mpuz-put-digit-on-board (/ D 1000) '(8 . 1))
- (mpuz-put-digit-on-board E '(10 . 9))
- (mpuz-put-digit-on-board (/ E 10) '(10 . 7))
- (mpuz-put-digit-on-board (/ E 100) '(10 . 5))
- (mpuz-put-digit-on-board (/ E 1000) '(10 . 3))
- (mpuz-put-digit-on-board (/ E 10000) '(10 . 1))))
-
- ;; Display
- ;;--------
- (defconst mpuz-framework
- "
- . . .
- Number of errors (this game): 0
- x . .
- -------
- . . . .
- Number of completed games: 0
- . . . .
- --------- Average number of errors: 0.00
- . . . . ."
- "The general picture of the puzzle screen, as a string.")
-
- (defun mpuz-create-buffer ()
- "Create (or recreate) the puzzle buffer. Return it."
- (let ((buff (get-buffer-create "*Mult Puzzle*")))
- (save-excursion
- (set-buffer buff)
- (let ((buffer-read-only nil))
- (erase-buffer)
- (insert mpuz-framework)
- (mpuz-paint-board)
- (mpuz-paint-errors)
- (mpuz-paint-statistics)))
- buff))
-
- (defun mpuz-paint-errors ()
- "Paint error count on the puzzle screen."
- (mpuz-switch-to-window)
- (let ((buffer-read-only nil))
- (goto-line 3)
- (move-to-column 49)
- (mpuz-delete-line)
- (insert (prin1-to-string mpuz-nb-errors))))
-
- (defun mpuz-paint-statistics ()
- "Paint statistics about previous games on the puzzle screen."
- (let* ((mean (if (zerop mpuz-nb-completed-games) 0
- (/ (+ mpuz-nb-completed-games (* 200 mpuz-nb-cumulated-errors))
- (* 2 mpuz-nb-completed-games))))
- (frac-part (% mean 100)))
- (let ((buffer-read-only nil))
- (goto-line 7)
- (move-to-column 51)
- (mpuz-delete-line)
- (insert (prin1-to-string mpuz-nb-completed-games))
- (goto-line 9)
- (move-to-column 50)
- (mpuz-delete-line)
- (insert (format "%d.%d%d" (/ mean 100) (/ frac-part 10) (% frac-part 10))))))
-
- (defun mpuz-paint-board ()
- "Paint board situation on the puzzle screen."
- (mpuz-switch-to-window)
- (let ((letter -1))
- (while (> 10 (setq letter (1+ letter)))
- (mpuz-paint-digit (mpuz-to-digit letter))))
- (goto-char (point-min)))
-
- (defun mpuz-paint-digit (digit)
- "Paint all occurrences of DIGIT on the puzzle board."
- ;; (mpuz-switch-to-window)
- (let ((char (if (mpuz-digit-solved-p digit)
- (+ digit ?0)
- (+ (mpuz-to-letter digit) ?A)))
- (square-l (aref mpuz-board digit)))
- (let ((buffer-read-only nil))
- (while square-l
- (goto-line (car (car square-l))) ; line before column !
- (move-to-column (cdr (car square-l)))
- (insert char)
- (delete-char 1)
- (backward-char 1)
- (setq square-l (cdr square-l))))))
-
- (defun mpuz-delete-line ()
- "Clear from point to next newline." ; & put nothing in the kill ring
- (while (not (= ?\n (char-after (point))))
- (delete-char 1)))
-
- (defun mpuz-get-buffer ()
- "Get the puzzle buffer if it exists."
- (get-buffer "*Mult Puzzle*"))
-
- (defun mpuz-switch-to-window ()
- "Find or create the Mult-Puzzle buffer, and display it."
- (let ((buff (mpuz-get-buffer)))
- (or buff (setq buff (mpuz-create-buffer)))
- (switch-to-buffer buff)
- (or buffer-read-only (toggle-read-only))
- (mpuz-mode)))
-
-
- ;; Game control
- ;;-------------
- (defun mpuz-abort-game ()
- "Abort any puzzle in progress."
- (message "Mult Puzzle aborted.")
- (setq mpuz-in-progress nil
- mpuz-nb-errors 0)
- (fillarray mpuz-board nil)
- (let ((buff (mpuz-get-buffer)))
- (if buff (kill-buffer buff))))
-
- (defun mpuz-start-new-game ()
- "Start a new puzzle."
- (message "Here we go...")
- (setq mpuz-nb-errors 0
- mpuz-in-progress t)
- (fillarray mpuz-found-digits nil) ; initialize mpuz-found-digits
- (mpuz-random-puzzle)
- (mpuz-switch-to-window)
- (mpuz-paint-board)
- (mpuz-paint-errors)
- (mpuz-ask-for-try))
-
- (defun mpuz-offer-new-game ()
- "Ask if user wants to start a new puzzle."
- (if (y-or-n-p "Start a new game ")
- (mpuz-start-new-game)
- (message "OK. I won't.")))
-
- ;;;###autoload
- (defun mpuz ()
- "Multiplication puzzle with GNU Emacs."
- ;; Main entry point
- (interactive)
- (mpuz-switch-to-window)
- (if mpuz-in-progress
- (mpuz-offer-abort)
- (mpuz-start-new-game)))
-
- (defun mpuz-offer-abort ()
- "Ask if user wants to abort current puzzle."
- (interactive)
- (if (y-or-n-p "Abort game ")
- (mpuz-abort-game)
- (mpuz-ask-for-try)))
-
- (defun mpuz-ask-for-try ()
- "Ask for user proposal in puzzle."
- (message "Your try ?"))
-
- (defun mpuz-try-letter ()
- "Propose a digit for a letter in puzzle."
- (interactive)
- (if mpuz-in-progress
- (let (letter-char digit digit-char message)
- (setq letter-char (upcase last-command-char)
- digit (mpuz-to-digit (- letter-char ?A)))
- (cond ((mpuz-digit-solved-p digit)
- (message "%c already solved." letter-char))
- ((null (aref mpuz-board digit))
- (message "%c does not appear." letter-char))
- ((progn (message "%c = " letter-char)
- ;; <char> has been entered.
- ;; Print "<char> =" and
- ;; read <num> or = <num>
- (setq digit-char (read-char))
- (if (eq digit-char ?=)
- (setq digit-char (read-char)))
- (message "%c = %c" letter-char digit-char)
- (or (> digit-char ?9) (< digit-char ?0))) ; bad input
- (ding t))
- (t
- (mpuz-try-proposal letter-char digit-char))))
- (mpuz-offer-new-game)))
-
- (defun mpuz-try-proposal (letter-char digit-char)
- "Propose LETTER-CHAR as code for DIGIT-CHAR."
- (let* ((letter (- letter-char ?A))
- (digit (- digit-char ?0))
- (correct-digit (mpuz-to-digit letter)))
- (cond ((mpuz-digit-solved-p correct-digit)
- (message "%c has already been found."))
- ((= digit correct-digit)
- (message "%c = %c correct !" letter-char digit-char)
- (mpuz-ding)
- (mpuz-correct-guess digit))
- (t ;;; incorrect guess
- (message "%c = %c incorrect !" letter-char digit-char)
- (mpuz-ding)
- (setq mpuz-nb-errors (1+ mpuz-nb-errors))
- (mpuz-paint-errors)))))
-
- (defun mpuz-correct-guess (digit)
- "Handle correct guessing of DIGIT."
- (aset mpuz-found-digits digit t) ; Mark digit as solved
- (mpuz-paint-digit digit) ; Repaint it (now as a digit)
- (if (mpuz-check-all-solved)
- (mpuz-close-game)))
-
- (defun mpuz-close-game ()
- "Housecleaning when puzzle has been solved."
- (setq mpuz-in-progress nil
- mpuz-nb-cumulated-errors (+ mpuz-nb-cumulated-errors mpuz-nb-errors)
- mpuz-nb-completed-games (1+ mpuz-nb-completed-games))
- (mpuz-paint-statistics)
- (let ((message (mpuz-congratulate)))
- (message message)
- (sit-for 4)
- (if (y-or-n-p (concat message " Start a new game "))
- (mpuz-start-new-game)
- (message "Good Bye !"))))
-
- (defun mpuz-congratulate ()
- "Build a congratulation message when puzzle is solved."
- (format "Puzzle solved with %d errors. %s"
- mpuz-nb-errors
- (cond ((= mpuz-nb-errors 0) "That's perfect !")
- ((= mpuz-nb-errors 1) "That's very good !")
- ((= mpuz-nb-errors 2) "That's good.")
- ((= mpuz-nb-errors 3) "That's not bad.")
- ((= mpuz-nb-errors 4) "That's not too bad...")
- ((and (>= mpuz-nb-errors 5)
- (< mpuz-nb-errors 10)) "That's bad !")
- ((and (>= mpuz-nb-errors 10)
- (< mpuz-nb-errors 15)) "That's awful.")
- ((>= mpuz-nb-errors 15) "That's not serious."))))
-
- (defun mpuz-show-solution ()
- "Display solution for debugging purposes."
- (interactive)
- (mpuz-switch-to-window)
- (let (digit list)
- (setq digit -1)
- (while (> 10 (setq digit (1+ digit)))
- (or (mpuz-digit-solved-p digit)
- (setq list (cons digit list))))
- (mapcar 'mpuz-correct-guess list)))
-
- ;;; mpuz.el ends here
-