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<!doctype html>

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<title>CodeMirror: Brainfuck mode</title>

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<style>

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.CodeMirror { border: 2px inset #dee; }

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</style>

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<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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<ul>

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<li><a href="../../doc/manual.html">Manual</a>

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</ul>

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<ul>

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<li><a href="../index.html">Language modes</a>

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</ul>

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</div>

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<h2>Brainfuck mode</h2>

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[ This program prints "Hello World!" and a newline to the screen, its

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length is 106 active command characters [it is not the shortest.]

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This loop is a "comment loop", it's a simple way of adding a comment

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to a BF program such that you don't have to worry about any command

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characters. Any ".", ",", "+", "-", "<" and ">" characters are simply

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ignored, the "[" and "]" characters just have to be balanced.

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]

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+++++ +++ Set Cell #0 to 8

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[

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>++++ Add 4 to Cell #1; this will always set Cell #1 to 4

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[ as the cell will be cleared by the loop

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>++ Add 2 to Cell #2

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>+++ Add 3 to Cell #3

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>+++ Add 3 to Cell #4

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>+ Add 1 to Cell #5

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<<<<- Decrement the loop counter in Cell #1

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] Loop till Cell #1 is zero; number of iterations is 4

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>+ Add 1 to Cell #2

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>+ Add 1 to Cell #3

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>- Subtract 1 from Cell #4

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>>+ Add 1 to Cell #6

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[<] Move back to the first zero cell you find; this will

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be Cell #1 which was cleared by the previous loop

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<- Decrement the loop Counter in Cell #0

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] Loop till Cell #0 is zero; number of iterations is 8

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The result of this is:

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Cell No : 0 1 2 3 4 5 6

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Contents: 0 0 72 104 88 32 8

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Pointer : ^

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>>. Cell #2 has value 72 which is 'H'

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>---. Subtract 3 from Cell #3 to get 101 which is 'e'

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+++++++..+++. Likewise for 'llo' from Cell #3

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>>. Cell #5 is 32 for the space

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<-. Subtract 1 from Cell #4 for 87 to give a 'W'

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<. Cell #3 was set to 'o' from the end of 'Hello'

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+++.------.--------. Cell #3 for 'rl' and 'd'

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>>+. Add 1 to Cell #5 gives us an exclamation point

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>++. And finally a newline from Cell #6

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</textarea></form>

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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {

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lineNumbers: true,

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matchBrackets: true,

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mode: "text/x-brainfuck"

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});

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</script>

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<p>A mode for Brainfuck</p>

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<p><strong>MIME types defined:</strong> <code>text/x-brainfuck</code></p>

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</article>

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