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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 free software; you can redistribute it and/or modify
8: ;; it under the terms of the GNU General Public License as published by
9: ;; the Free Software Foundation; either version 1, or (at your option)
10: ;; any later version.
11:
12: ;; GNU Emacs is distributed in the hope that it will be useful,
13: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: ;; GNU General Public License for more details.
16:
17: ;; You should have received a copy of the GNU General Public License
18: ;; along with GNU Emacs; see the file COPYING. If not, write to
19: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20:
21: (provide 'life)
22:
23: (defconst life-patterns
24: [("@@@" " @@" "@@@")
25: ("@@@ @@@" "@@ @@ " "@@@ @@@")
26: ("@@@ @@@" "@@ @@" "@@@ @@@")
27: ("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@")
28: ("@@@@@@@@@@")
29: (" @@@@@@@@@@ "
30: " @@@@@@@@@@ "
31: " @@@@@@@@@@ "
32: "@@@@@@@@@@ "
33: "@@@@@@@@@@ ")
34: ("@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@" "@")
35: ("@ @" "@ @" "@ @"
36: "@ @" "@ @" "@ @"
37: "@ @" "@ @" "@ @"
38: "@ @" "@ @" "@ @"
39: "@ @" "@ @" "@ @")
40: ("@@ " " @@ " " @@ "
41: " @@ " " @@ " " @@ "
42: " @@ " " @@ " " @@ "
43: " @@ " " @@ " " @@ "
44: " @@ " " @@ " " @@ "
45: " @@")
46: ("@@@@@@@@@" "@ @ @" "@ @@@@@ @" "@ @ @ @" "@@@ @@@"
47: "@ @ @ @" "@ @@@@@ @" "@ @ @" "@@@@@@@@@")]
48: "Vector of rectangles containing some Life startup patterns.")
49:
50: ;; Macros are used macros for manifest constants instead of variables
51: ;; because the compiler will convert them to constants, which should
52: ;; eval faster than symbols.
53: ;;
54: ;; The (require) wrapping forces the compiler to eval these macros at
55: ;; compile time. This would not be necessary if we did not use macros
56: ;; inside of macros, which the compiler doesn't seem to check for.
57: ;;
58: ;; Don't change any of the life-* macro constants unless you thoroughly
59: ;; understand the `life-grim-reaper' function.
60: (require
61: (progn
62: (defmacro life-life-char () ?@)
63: (defmacro life-death-char () (1+ (life-life-char)))
64: (defmacro life-birth-char () 3)
65: (defmacro life-void-char () ?\ )
66:
67: (defmacro life-life-string () (char-to-string (life-life-char)))
68: (defmacro life-death-string () (char-to-string (life-death-char)))
69: (defmacro life-birth-string () (char-to-string (life-birth-char)))
70: (defmacro life-void-string () (char-to-string (life-void-char)))
71: (defmacro life-not-void-regexp () (concat "[^" (life-void-string) "\n]"))
72:
73: ;; try to optimize the (goto-char (point-min)) & (goto-char (point-max))
74: ;; idioms. This depends on goto-char's not griping if we underrshoot
75: ;; or overshoot beginning or end of buffer.
76: (defmacro goto-beginning-of-buffer () '(goto-char 1))
77: (defmacro maxint () (lsh (lsh (lognot 0) 1) -1))
78: (defmacro goto-end-of-buffer () '(goto-char (maxint)))
79:
80: (defmacro increment (variable) (list 'setq variable (list '1+ variable)))
81: 'life))
82:
83: ;; list of numbers that tell how many characters to move to get to
84: ;; each of a cell's eight neighbors.
85: (defconst life-neighbor-deltas nil)
86:
87: ;; window display always starts here. Easier to deal with than
88: ;; (scroll-up) and (scroll-down) when trying to center the display.
89: (defconst life-window-start nil)
90:
91: ;; For mode line
92: (defconst life-current-generation nil)
93: ;; Sadly, mode-line-format won't display numbers.
94: (defconst life-generation-string nil)
95:
96: (defun abs (n) (if (< n 0) (- n) n))
97:
98: (defun life (&optional sleeptime)
99: "Run Conway's Life simulation.
100: The starting pattern is randomly selected. Prefix arg (optional first arg
101: non-nil from a program) is the number of seconds to sleep between
102: generations (this defaults to 1)."
103: (interactive "p")
104: (or sleeptime (setq sleeptime 1))
105: (life-setup)
106: (life-display-generation sleeptime)
107: (while t
108: (let ((inhibit-quit t))
109: (life-grim-reaper)
110: (life-expand-plane-if-needed)
111: (life-increment-generation)
112: (life-display-generation sleeptime))))
113:
114: (fset 'life-mode 'life)
115: (put 'life-mode 'mode-class 'special)
116:
117: (random t)
118:
119: (defun life-setup ()
120: (let (n)
121: (switch-to-buffer (get-buffer-create "*Life*") t)
122: (erase-buffer)
123: (kill-all-local-variables)
124: (setq case-fold-search nil
125: mode-name "Life"
126: major-mode 'life-mode
127: truncate-lines t
128: life-current-generation 0
129: life-generation-string "0"
130: mode-line-buffer-identification '("Life: generation "
131: life-generation-string)
132: fill-column (1- (window-width))
133: life-window-start 1)
134: (buffer-flush-undo (current-buffer))
135: ;; stuff in the random pattern
136: (life-insert-random-pattern)
137: ;; make sure (life-life-char) is used throughout
138: (goto-beginning-of-buffer)
139: (while (re-search-forward (life-not-void-regexp) nil t)
140: (replace-match (life-life-string) t t))
141: ;; center the pattern horizontally
142: (goto-beginning-of-buffer)
143: (setq n (/ (- fill-column (save-excursion (end-of-line) (point))) 2))
144: (while (not (eobp))
145: (indent-to n)
146: (forward-line))
147: ;; center the pattern vertically
148: (setq n (/ (- (1- (window-height))
149: (count-lines (point-min) (point-max)))
150: 2))
151: (goto-beginning-of-buffer)
152: (newline n)
153: (goto-end-of-buffer)
154: (newline n)
155: ;; pad lines out to fill-column
156: (goto-beginning-of-buffer)
157: (while (not (eobp))
158: (end-of-line)
159: (indent-to fill-column)
160: (move-to-column fill-column)
161: (delete-region (point) (progn (end-of-line) (point)))
162: (forward-line))
163: ;; expand tabs to spaces
164: (untabify (point-min) (point-max))
165: ;; before starting be sure the automaton has room to grow
166: (life-expand-plane-if-needed)
167: ;; compute initial neighbor deltas
168: (life-compute-neighbor-deltas)))
169:
170: (defun life-compute-neighbor-deltas ()
171: (setq life-neighbor-deltas
172: (list -1 (- fill-column)
173: (- (1+ fill-column)) (- (+ 2 fill-column))
174: 1 fill-column (1+ fill-column)
175: (+ 2 fill-column))))
176:
177: (defun life-insert-random-pattern ()
178: (insert-rectangle
179: (elt life-patterns (% (abs (random)) (length life-patterns))))
180: (insert ?\n))
181:
182: (defun life-increment-generation ()
183: (increment life-current-generation)
184: (setq life-generation-string (int-to-string life-current-generation)))
185:
186: (defun life-grim-reaper ()
187: ;; Clear the match information. Later we check to see if it
188: ;; is still clear, if so then all the cells have died.
189: (store-match-data nil)
190: (goto-beginning-of-buffer)
191: ;; For speed declare all local variable outside the loop.
192: (let (point char pivot living-neighbors list)
193: (while (search-forward (life-life-string) nil t)
194: (setq list life-neighbor-deltas
195: living-neighbors 0
196: pivot (1- (point)))
197: (while list
198: (setq point (+ pivot (car list))
199: char (char-after point))
200: (cond ((eq char (life-void-char))
201: (subst-char-in-region point (1+ point)
202: (life-void-char) 1 t))
203: ((< char 3)
204: (subst-char-in-region point (1+ point) char (1+ char) t))
205: ((< char 9)
206: (subst-char-in-region point (1+ point) char 9 t))
207: ((>= char (life-life-char))
208: (increment living-neighbors)))
209: (setq list (cdr list)))
210: (if (memq living-neighbors '(2 3))
211: ()
212: (subst-char-in-region pivot (1+ pivot)
213: (life-life-char) (life-death-char) t))))
214: (if (null (match-beginning 0))
215: (life-extinct-quit))
216: (subst-char-in-region 1 (point-max) 9 (life-void-char) t)
217: (subst-char-in-region 1 (point-max) 1 (life-void-char) t)
218: (subst-char-in-region 1 (point-max) 2 (life-void-char) t)
219: (subst-char-in-region 1 (point-max) (life-birth-char) (life-life-char) t)
220: (subst-char-in-region 1 (point-max) (life-death-char) (life-void-char) t))
221:
222: (defun life-expand-plane-if-needed ()
223: (catch 'done
224: (goto-beginning-of-buffer)
225: (while (not (eobp))
226: ;; check for life at beginning or end of line. If found at
227: ;; either end, expand at both ends,
228: (cond ((or (eq (following-char) (life-life-char))
229: (eq (progn (end-of-line) (preceding-char)) (life-life-char)))
230: (goto-beginning-of-buffer)
231: (while (not (eobp))
232: (insert (life-void-char))
233: (end-of-line)
234: (insert (life-void-char))
235: (forward-char))
236: (setq fill-column (+ 2 fill-column))
237: (scroll-left 1)
238: (life-compute-neighbor-deltas)
239: (throw 'done t)))
240: (forward-line)))
241: (goto-beginning-of-buffer)
242: ;; check for life within the first two lines of the buffer.
243: ;; If present insert two lifeless lines at the beginning..
244: (cond ((search-forward (life-life-string)
245: (+ (point) fill-column fill-column 2) t)
246: (goto-beginning-of-buffer)
247: (insert-char (life-void-char) fill-column)
248: (insert ?\n)
249: (insert-char (life-void-char) fill-column)
250: (insert ?\n)
251: (setq life-window-start (+ life-window-start fill-column 1))))
252: (goto-end-of-buffer)
253: ;; check for life within the last two lines of the buffer.
254: ;; If present insert two lifeless lines at the end.
255: (cond ((search-backward (life-life-string)
256: (- (point) fill-column fill-column 2) t)
257: (goto-end-of-buffer)
258: (insert-char (life-void-char) fill-column)
259: (insert ?\n)
260: (insert-char (life-void-char) fill-column)
261: (insert ?\n)
262: (setq life-window-start (+ life-window-start fill-column 1)))))
263:
264: (defun life-display-generation (sleeptime)
265: (goto-char life-window-start)
266: (recenter 0)
267: (sit-for sleeptime))
268:
269: (defun life-extinct-quit ()
270: (life-display-generation 0)
271: (signal 'life-extinct nil))
272:
273: (put 'life-extinct 'error-conditions '(life-extinct quit))
274: (put 'life-extinct 'error-message "All life has perished")
275:
276:
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