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1.1 root 1: ;; Conway's `Life' for GNU Emacs
2: ;; Copyright (C) 1988 Free Software Foundation, Inc.
3: ;; Contributed by Kyle Jones, [email protected]
4:
5: ;; This file is part of GNU Emacs.
6:
7: ;; GNU Emacs is distributed in the hope that it will be useful,
8: ;; but WITHOUT ANY WARRANTY. No author or distributor
9: ;; accepts responsibility to anyone for the consequences of using it
10: ;; or for whether it serves any particular purpose or works at all,
11: ;; unless he says so in writing. Refer to the GNU Emacs General Public
12: ;; License for full details.
13:
14: ;; Everyone is granted permission to copy, modify and redistribute
15: ;; GNU Emacs, but only under the conditions described in the
16: ;; GNU Emacs General Public License. A copy of this license is
17: ;; supposed to have been given to you along with GNU Emacs so you
18: ;; can know your rights and responsibilities. It should be in a
19: ;; file named COPYING. Among other things, the copyright notice
20: ;; and this notice must be preserved on all copies.
21:
22: (provide 'life)
23:
24: (defconst life-patterns
25: [("@@@" " @@" "@@@")
26: ("@@@ @@@" "@@ @@ " "@@@ @@@")
27: ("@@@ @@@" "@@ @@" "@@@ @@@")
28: ("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")
29: ("@@@@@@@@@@")
30: (" @@@@@@@@@@ "
31: " @@@@@@@@@@ "
32: " @@@@@@@@@@ "
33: "@@@@@@@@@@ "
34: "@@@@@@@@@@ ")
35: ("@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@")
36: ("@ @" "@ @" "@ @"
37: "@ @" "@ @" "@ @"
38: "@ @" "@ @" "@ @"
39: "@ @" "@ @" "@ @"
40: "@ @" "@ @" "@ @")
41: ("@@ " " @@ " " @@ "
42: " @@ " " @@ " " @@ "
43: " @@ " " @@ " " @@ "
44: " @@ " " @@ " " @@ "
45: " @@ " " @@ " " @@ "
46: " @@")
47: ("@@@@@@@@@" "@ @ @" "@ @@@@@ @" "@ @ @ @" "@@@ @@@"
48: "@ @ @ @" "@ @@@@@ @" "@ @ @" "@@@@@@@@@")]
49: "Vector of rectangles containing some Life startup patterns.")
50:
51: ;; Macros are used macros for manifest constants instead of variables
52: ;; because the compiler will convert them to constants, which should
53: ;; eval faster than symbols.
54: ;;
55: ;; The (require) wrapping forces the compiler to eval these macros at
56: ;; compile time. This would not be necessary if we did not use macros
57: ;; inside of macros, which the compiler doesn't seem to check for.
58: ;;
59: ;; Don't change any of the life-* macro constants unless you thoroughly
60: ;; understand the `life-grim-reaper' function.
61: (require
62: (progn
63: (defmacro life-life-char () ?@)
64: (defmacro life-death-char () (1+ (life-life-char)))
65: (defmacro life-birth-char () 3)
66: (defmacro life-void-char () ?\ )
67:
68: (defmacro life-life-string () (char-to-string (life-life-char)))
69: (defmacro life-death-string () (char-to-string (life-death-char)))
70: (defmacro life-birth-string () (char-to-string (life-birth-char)))
71: (defmacro life-void-string () (char-to-string (life-void-char)))
72: (defmacro life-not-void-regexp () (concat "[^" (life-void-string) "\n]"))
73:
74: ;; try to optimize the (goto-char (point-min)) & (goto-char (point-max))
75: ;; idioms. This depends on goto-char's not griping if we underrshoot
76: ;; or overshoot beginning or end of buffer.
77: (defmacro goto-beginning-of-buffer () '(goto-char 1))
78: (defmacro maxint () (lsh (lsh (lognot 0) 1) -1))
79: (defmacro goto-end-of-buffer () '(goto-char (maxint)))
80:
81: (defmacro increment (variable) (list 'setq variable (list '1+ variable)))
82: 'life))
83:
84: ;; list of numbers that tell how many characters to move to get to
85: ;; each of a cell's eight neighbors.
86: (defconst life-neighbor-deltas nil)
87:
88: ;; window display always starts here. Easier to deal with than
89: ;; (scroll-up) and (scroll-down) when trying to center the display.
90: (defconst life-window-start nil)
91:
92: ;; For mode line
93: (defconst life-current-generation nil)
94: ;; Sadly, mode-line-format won't display numbers.
95: (defconst life-generation-string nil)
96:
97: (defun abs (n) (if (< n 0) (- n) n))
98:
99: (defun life (&optional sleeptime)
100: "Run Conway's Life simulation.
101: The starting pattern is randomly selected. Prefix arg (optional first arg
102: non-nil from a program) is the number of seconds to sleep between
103: generations (this defaults to 1)."
104: (interactive "p")
105: (or sleeptime (setq sleeptime 1))
106: (life-setup)
107: (life-display-generation sleeptime)
108: (while t
109: (let ((inhibit-quit t))
110: (life-grim-reaper)
111: (life-expand-plane-if-needed)
112: (life-increment-generation)
113: (life-display-generation sleeptime))))
114:
115: (fset 'life-mode 'life)
116: (put 'life-mode 'mode-class 'special)
117:
118: (random t)
119:
120: (defun life-setup ()
121: (let (n)
122: (switch-to-buffer (get-buffer-create "*Life*") t)
123: (erase-buffer)
124: (kill-all-local-variables)
125: (setq case-fold-search nil
126: mode-name "Life"
127: major-mode 'life-mode
128: truncate-lines t
129: life-current-generation 0
130: life-generation-string "0"
131: mode-line-buffer-identification '("Life: generation "
132: life-generation-string)
133: fill-column (1- (window-width))
134: life-window-start 1)
135: (buffer-flush-undo (current-buffer))
136: ;; stuff in the random pattern
137: (life-insert-random-pattern)
138: ;; make sure (life-life-char) is used throughout
139: (goto-beginning-of-buffer)
140: (while (re-search-forward (life-not-void-regexp) nil t)
141: (replace-match (life-life-string) t t))
142: ;; center the pattern horizontally
143: (goto-beginning-of-buffer)
144: (setq n (/ (- fill-column (save-excursion (end-of-line) (point))) 2))
145: (while (not (eobp))
146: (indent-to n)
147: (forward-line))
148: ;; center the pattern vertically
149: (setq n (/ (- (1- (window-height))
150: (count-lines (point-min) (point-max)))
151: 2))
152: (goto-beginning-of-buffer)
153: (newline n)
154: (goto-end-of-buffer)
155: (newline n)
156: ;; pad lines out to fill-column
157: (goto-beginning-of-buffer)
158: (while (not (eobp))
159: (end-of-line)
160: (indent-to fill-column)
161: (move-to-column fill-column)
162: (delete-region (point) (progn (end-of-line) (point)))
163: (forward-line))
164: ;; expand tabs to spaces
165: (untabify (point-min) (point-max))
166: ;; before starting be sure the automaton has room to grow
167: (life-expand-plane-if-needed)
168: ;; compute initial neighbor deltas
169: (life-compute-neighbor-deltas)))
170:
171: (defun life-compute-neighbor-deltas ()
172: (setq life-neighbor-deltas
173: (list -1 (- fill-column)
174: (- (1+ fill-column)) (- (+ 2 fill-column))
175: 1 fill-column (1+ fill-column)
176: (+ 2 fill-column))))
177:
178: (defun life-insert-random-pattern ()
179: (insert-rectangle
180: (elt life-patterns (% (abs (random)) (length life-patterns))))
181: (insert ?\n))
182:
183: (defun life-increment-generation ()
184: (increment life-current-generation)
185: (setq life-generation-string (int-to-string life-current-generation)))
186:
187: (defun life-grim-reaper ()
188: ;; Clear the match information. Later we check to see if it
189: ;; is still clear, if so then all the cells have died.
190: (store-match-data nil)
191: (goto-beginning-of-buffer)
192: ;; For speed declare all local variable outside the loop.
193: (let (point char pivot living-neighbors list)
194: (while (search-forward (life-life-string) nil t)
195: (setq list life-neighbor-deltas
196: living-neighbors 0
197: pivot (1- (point)))
198: (while list
199: (setq point (+ pivot (car list))
200: char (char-after point))
201: (cond ((eq char (life-void-char))
202: (subst-char-in-region point (1+ point)
203: (life-void-char) 1 t))
204: ((< char 3)
205: (subst-char-in-region point (1+ point) char (1+ char) t))
206: ((< char 9)
207: (subst-char-in-region point (1+ point) char 9 t))
208: ((>= char (life-life-char))
209: (increment living-neighbors)))
210: (setq list (cdr list)))
211: (if (memq living-neighbors '(2 3))
212: ()
213: (subst-char-in-region pivot (1+ pivot)
214: (life-life-char) (life-death-char) t))))
215: (if (null (match-beginning 0))
216: (life-extinct-quit))
217: (subst-char-in-region 1 (point-max) 9 (life-void-char) t)
218: (subst-char-in-region 1 (point-max) 1 (life-void-char) t)
219: (subst-char-in-region 1 (point-max) 2 (life-void-char) t)
220: (subst-char-in-region 1 (point-max) (life-birth-char) (life-life-char) t)
221: (subst-char-in-region 1 (point-max) (life-death-char) (life-void-char) t))
222:
223: (defun life-expand-plane-if-needed ()
224: (catch 'done
225: (goto-beginning-of-buffer)
226: (while (not (eobp))
227: ;; check for life at beginning or end of line. If found at
228: ;; either end, expand at both ends,
229: (cond ((or (eq (following-char) (life-life-char))
230: (eq (progn (end-of-line) (preceding-char)) (life-life-char)))
231: (goto-beginning-of-buffer)
232: (while (not (eobp))
233: (insert (life-void-char))
234: (end-of-line)
235: (insert (life-void-char))
236: (forward-char))
237: (setq fill-column (+ 2 fill-column))
238: (scroll-left 1)
239: (life-compute-neighbor-deltas)
240: (throw 'done t)))
241: (forward-line)))
242: (goto-beginning-of-buffer)
243: ;; check for life within the first two lines of the buffer.
244: ;; If present insert two lifeless lines at the beginning..
245: (cond ((search-forward (life-life-string)
246: (+ (point) fill-column fill-column 2) t)
247: (goto-beginning-of-buffer)
248: (insert-char (life-void-char) fill-column)
249: (insert ?\n)
250: (insert-char (life-void-char) fill-column)
251: (insert ?\n)
252: (setq life-window-start (+ life-window-start fill-column 1))))
253: (goto-end-of-buffer)
254: ;; check for life within the last two lines of the buffer.
255: ;; If present insert two lifeless lines at the end.
256: (cond ((search-backward (life-life-string)
257: (- (point) fill-column fill-column 2) t)
258: (goto-end-of-buffer)
259: (insert-char (life-void-char) fill-column)
260: (insert ?\n)
261: (insert-char (life-void-char) fill-column)
262: (insert ?\n)
263: (setq life-window-start (+ life-window-start fill-column 1)))))
264:
265: (defun life-display-generation (sleeptime)
266: (goto-char life-window-start)
267: (recenter 0)
268: (sit-for sleeptime))
269:
270: (defun life-extinct-quit ()
271: (life-display-generation 0)
272: (signal 'life-extinct nil))
273:
274: (put 'life-extinct 'error-conditions '(life-extinct quit))
275: (put 'life-extinct 'error-message "All life has perished")
276:
277:
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