scripts/CodeMirror/mode/clojure/index.html (view raw)
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27<article>
28<h2>Clojure mode</h2>
29<form><textarea id="code" name="code">
30(ns game-of-life
31 "Conway's Game of Life, based on the work of
32 Christophe Grand (http://clj-me.cgrand.net/2011/08/19/conways-game-of-life)
33 and Laurent Petit (https://gist.github.com/1200343).")
34
35;;; Core game of life's algorithm functions
36
37(defn neighbors
38 "Given a cell's coordinates `[x y]`, returns the coordinates of its
39 neighbors."
40 [[x y]]
41 (for [dx [-1 0 1]
42 dy (if (zero? dx)
43 [-1 1]
44 [-1 0 1])]
45 [(+ dx x) (+ dy y)]))
46
47(defn step
48 "Given a set of living `cells`, computes the new set of living cells."
49 [cells]
50 (set (for [[cell n] (frequencies (mapcat neighbors cells))
51 :when (or (= n 3)
52 (and (= n 2)
53 (cells cell)))]
54 cell)))
55
56;;; Utility methods for displaying game on a text terminal
57
58(defn print-grid
59 "Prints a `grid` of `w` columns and `h` rows, on *out*, representing a
60 step in the game."
61 [grid w h]
62 (doseq [x (range (inc w))
63 y (range (inc h))]
64 (when (= y 0) (println))
65 (print (if (grid [x y])
66 "[X]"
67 " . "))))
68
69(defn print-grids
70 "Prints a sequence of `grids` of `w` columns and `h` rows on *out*,
71 representing several steps."
72 [grids w h]
73 (doseq [grid grids]
74 (print-grid grid w h)
75 (println)))
76
77;;; Launches an example grid
78
79(def grid
80 "`grid` represents the initial set of living cells"
81 #{[2 1] [2 2] [2 3]})
82
83(print-grids (take 3 (iterate step grid)) 5 5)</textarea></form>
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93 <p><strong>MIME types defined:</strong> <code>text/x-clojure</code>.</p>
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