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| <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 ".", ",", "+", "-", "<" 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 6 | |
| Contents: 0 0 72 104 88 32 8 | |
| Pointer : ^ | |
| >>. 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> | |