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1 <!doctype html>
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2
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3 <title>CodeMirror: Brainfuck mode</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../../doc/docs.css">
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6
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7 <link rel="stylesheet" href="../../lib/codemirror.css">
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8 <script src="../../lib/codemirror.js"></script>
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9 <script src="../../addon/edit/matchbrackets.js"></script>
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10 <script src="./brainfuck.js"></script>
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11 <style>
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12 .CodeMirror { border: 2px inset #dee; }
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13 </style>
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14 <div id=nav>
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15 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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16
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17 <ul>
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18 <li><a href="../../index.html">Home</a>
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19 <li><a href="../../doc/manual.html">Manual</a>
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20 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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21 </ul>
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22 <ul>
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23 <li><a href="../index.html">Language modes</a>
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24 <li><a class=active href="#"></a>
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25 </ul>
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26 </div>
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27
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28 <article>
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29 <h2>Brainfuck mode</h2>
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30 <form><textarea id="code" name="code">
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31 [ This program prints "Hello World!" and a newline to the screen, its
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32 length is 106 active command characters [it is not the shortest.]
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33
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34 This loop is a "comment loop", it's a simple way of adding a comment
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35 to a BF program such that you don't have to worry about any command
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36 characters. Any ".", ",", "+", "-", "<" and ">" characters are simply
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37 ignored, the "[" and "]" characters just have to be balanced.
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38 ]
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39 +++++ +++ Set Cell #0 to 8
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40 [
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41 >++++ Add 4 to Cell #1; this will always set Cell #1 to 4
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42 [ as the cell will be cleared by the loop
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43 >++ Add 2 to Cell #2
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44 >+++ Add 3 to Cell #3
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45 >+++ Add 3 to Cell #4
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46 >+ Add 1 to Cell #5
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47 <<<<- Decrement the loop counter in Cell #1
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48 ] Loop till Cell #1 is zero; number of iterations is 4
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49 >+ Add 1 to Cell #2
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50 >+ Add 1 to Cell #3
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51 >- Subtract 1 from Cell #4
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52 >>+ Add 1 to Cell #6
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53 [<] Move back to the first zero cell you find; this will
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54 be Cell #1 which was cleared by the previous loop
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55 <- Decrement the loop Counter in Cell #0
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56 ] Loop till Cell #0 is zero; number of iterations is 8
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57
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58 The result of this is:
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59 Cell No : 0 1 2 3 4 5 6
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60 Contents: 0 0 72 104 88 32 8
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61 Pointer : ^
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62
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63 >>. Cell #2 has value 72 which is 'H'
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64 >---. Subtract 3 from Cell #3 to get 101 which is 'e'
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65 +++++++..+++. Likewise for 'llo' from Cell #3
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66 >>. Cell #5 is 32 for the space
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67 <-. Subtract 1 from Cell #4 for 87 to give a 'W'
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68 <. Cell #3 was set to 'o' from the end of 'Hello'
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69 +++.------.--------. Cell #3 for 'rl' and 'd'
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70 >>+. Add 1 to Cell #5 gives us an exclamation point
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71 >++. And finally a newline from Cell #6
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72 </textarea></form>
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73
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74 <script>
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75 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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76 lineNumbers: true,
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77 matchBrackets: true,
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78 mode: "text/x-brainfuck"
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79 });
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80 </script>
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81
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82 <p>A mode for Brainfuck</p>
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83
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84 <p><strong>MIME types defined:</strong> <code>text/x-brainfuck</code></p>
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85 </article>
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