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<!doctype html>
<title>CodeMirror: Brainfuck mode</title>
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<article>
<h2>Brainfuck mode</h2>
<form><textarea id="code" name="code">
[ This program prints "Hello World!" and a newline to the screen, its
length is 106 active command characters [it is not the shortest.]
This loop is a "comment loop", it's a simple way of adding a comment
to a BF program such that you don't have to worry about any command
characters. Any ".", ",", "+", "-", "&lt;" and "&gt;" characters are simply
ignored, the "[" and "]" characters just have to be balanced.
]
+++++ +++ Set Cell #0 to 8
[
&gt;++++ Add 4 to Cell #1; this will always set Cell #1 to 4
[ as the cell will be cleared by the loop
&gt;++ Add 2 to Cell #2
&gt;+++ Add 3 to Cell #3
&gt;+++ Add 3 to Cell #4
&gt;+ Add 1 to Cell #5
&lt;&lt;&lt;&lt;- Decrement the loop counter in Cell #1
] Loop till Cell #1 is zero; number of iterations is 4
&gt;+ Add 1 to Cell #2
&gt;+ Add 1 to Cell #3
&gt;- Subtract 1 from Cell #4
&gt;&gt;+ Add 1 to Cell #6
[&lt;] Move back to the first zero cell you find; this will
be Cell #1 which was cleared by the previous loop
&lt;- Decrement the loop Counter in Cell #0
] Loop till Cell #0 is zero; number of iterations is 8
The result of this is:
Cell No : 0 1 2 3 4 5 6
Contents: 0 0 72 104 88 32 8
Pointer : ^
&gt;&gt;. Cell #2 has value 72 which is 'H'
&gt;---. Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++. Likewise for 'llo' from Cell #3
&gt;&gt;. Cell #5 is 32 for the space
&lt;-. Subtract 1 from Cell #4 for 87 to give a 'W'
&lt;. Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------. Cell #3 for 'rl' and 'd'
&gt;&gt;+. Add 1 to Cell #5 gives us an exclamation point
&gt;++. And finally a newline from Cell #6
</textarea></form>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
lineNumbers: true,
matchBrackets: true,
mode: "text/x-brainfuck"
});
</script>
<p>A mode for Brainfuck</p>
<p><strong>MIME types defined:</strong> <code>text/x-brainfuck</code></p>
</article>