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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>CodeMirror: Clojure mode</title>
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<link rel="stylesheet" href="../../lib/codemirror.css">
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<script src="../../lib/codemirror.js"></script>
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<script src="clojure.js"></script>
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<style>.CodeMirror {background: #f8f8f8;}</style>
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<link rel="stylesheet" href="../../doc/docs.css">
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</head>
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<body>
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<h1>CodeMirror: Clojure mode</h1>
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<form><textarea id="code" name="code">
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; Conway's Game of Life, based on the work of:
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;; Laurent Petit https://gist.github.com/1200343
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;; Christophe Grand http://clj-me.cgrand.net/2011/08/19/conways-game-of-life
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(ns ^{:doc "Conway's Game of Life."}
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game-of-life)
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;; Core game of life's algorithm functions
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(defn neighbours
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"Given a cell's coordinates, returns the coordinates of its neighbours."
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[[x y]]
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(for [dx [-1 0 1] dy (if (zero? dx) [-1 1] [-1 0 1])]
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[(+ dx x) (+ dy y)]))
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(defn step
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"Given a set of living cells, computes the new set of living cells."
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[cells]
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(set (for [[cell n] (frequencies (mapcat neighbours cells))
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:when (or (= n 3) (and (= n 2) (cells cell)))]
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cell)))
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;; Utility methods for displaying game on a text terminal
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(defn print-board
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"Prints a board on *out*, representing a step in the game."
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[board w h]
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(doseq [x (range (inc w)) y (range (inc h))]
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(if (= y 0) (print "\n"))
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(print (if (board [x y]) "[X]" " . "))))
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(defn display-grids
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"Prints a squence of boards on *out*, representing several steps."
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[grids w h]
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(doseq [board grids]
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(print-board board w h)
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(print "\n")))
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;; Launches an example board
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(def
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^{:doc "board represents the initial set of living cells"}
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board #{[2 1] [2 2] [2 3]})
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(display-grids (take 3 (iterate step board)) 5 5)
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;; Let's play with characters
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(println \1 \a \# \\
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\" \( \newline
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\} \" \space
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\tab \return \backspace
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\u1000 \uAaAa \u9F9F)
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</textarea></form>
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<script>
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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {});
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</script>
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<p><strong>MIME types defined:</strong> <code>text/x-clojure</code>.</p>
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</body>
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</html>
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