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1 <!doctype html>
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2
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3 <title>CodeMirror: Mode-Changing Demo</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="../mode/javascript/javascript.js"></script>
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10 <script src="../mode/scheme/scheme.js"></script>
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11 <style>
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12 .CodeMirror {border: 1px solid black;}
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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"></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 class=active href="#">Mode-Changing</a>
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24 </ul>
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25 </div>
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26
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27 <article>
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28 <h2>Mode-Changing Demo</h2>
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29 <form><textarea id="code" name="code">
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30 ;; If there is Scheme code in here, the editor will be in Scheme mode.
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31 ;; If you put in JS instead, it'll switch to JS mode.
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32
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33 (define (double x)
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34 (* x x))
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35 </textarea></form>
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36
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37 <p>On changes to the content of the above editor, a (crude) script
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38 tries to auto-detect the language used, and switches the editor to
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39 either JavaScript or Scheme mode based on that.</p>
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40
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41 <script>
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42 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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43 mode: "scheme",
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44 lineNumbers: true
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45 });
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46 var pending;
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47 editor.on("change", function() {
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48 clearTimeout(pending);
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49 pending = setTimeout(update, 400);
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50 });
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51 function looksLikeScheme(code) {
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52 return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code);
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53 }
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54 function update() {
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55 editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript");
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56 }
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57 </script>
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58 </article>
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