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1 <!doctype html>
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2
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3 <title>CodeMirror: Dart 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 <link rel="stylesheet" href="../../lib/codemirror.css">
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7 <script src="../../lib/codemirror.js"></script>
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8 <script src="../clike/clike.js"></script>
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9 <script src="dart.js"></script>
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10 <style>.CodeMirror {border: 1px solid #dee;}</style>
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11 <div id=nav>
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12 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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13
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14 <ul>
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15 <li><a href="../../index.html">Home</a>
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16 <li><a href="../../doc/manual.html">Manual</a>
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17 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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18 </ul>
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19 <ul>
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20 <li><a href="../index.html">Language modes</a>
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21 <li><a class=active href="#">Dart</a>
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22 </ul>
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23 </div>
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24
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25 <article>
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26 <h2>Dart mode</h2>
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27 <form>
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28 <textarea id="code" name="code">
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29 import 'dart:math' show Random;
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30
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31 void main() {
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32 print(Die(n: 12).roll());
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33 }
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34
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35 // Define a class.
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36 class Die {
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37 // Define a class variable.
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38 static final Random shaker = Random();
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39
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40 // Define instance variables.
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41 final int sides;
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42 int? lastRoll;
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43
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44 // Define a constructor.
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45 Die({int n = 6}) : sides = n {
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46 if (4 > n || n > 20) {
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47 // Support for errors and exceptions.
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48 throw ArgumentError(/* */);
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49 }
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50 }
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51
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52 // Define a method using shorthand syntax.
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53 @override
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54 String toString() => '$lastRoll';
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55
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56 // Define an instance method.
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57 int roll() {
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58 return lastRoll = shaker.nextInt(sides) + 1;
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59 }
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60 }
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61 </textarea>
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62 </form>
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63
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64 <script>
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65 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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66 lineNumbers: true,
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67 mode: "application/dart"
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68 });
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69 </script>
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70
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71 </article>
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