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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 ".", ",", "+", "-", "<" and ">" characters are simply ignored, the "[" and "]" characters just have to be balanced.]+++++ +++ Set Cell #0 to 8[ >++++ Add 4 to Cell #1; this will always set Cell #1 to 4 [ as the cell will be cleared by the loop >++ Add 2 to Cell #2 >+++ Add 3 to Cell #3 >+++ Add 3 to Cell #4 >+ Add 1 to Cell #5 <<<<- Decrement the loop counter in Cell #1 ] Loop till Cell #1 is zero; number of iterations is 4 >+ Add 1 to Cell #2 >+ Add 1 to Cell #3 >- Subtract 1 from Cell #4 >>+ Add 1 to Cell #6 [<] Move back to the first zero cell you find; this will be Cell #1 which was cleared by the previous loop <- 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 6Contents: 0 0 72 104 88 32 8Pointer : ^
>>. Cell #2 has value 72 which is 'H'>---. Subtract 3 from Cell #3 to get 101 which is 'e'+++++++..+++. Likewise for 'llo' from Cell #3>>. Cell #5 is 32 for the space<-. Subtract 1 from Cell #4 for 87 to give a 'W'<. Cell #3 was set to 'o' from the end of 'Hello'+++.------.--------. Cell #3 for 'rl' and 'd'>>+. Add 1 to Cell #5 gives us an exclamation point>++. 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>
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