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1 <!doctype html>
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2 <html>
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3 <head>
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4 <title>CodeMirror: PEG.js Mode</title>
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5 <meta charset="utf-8"/>
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6 <link rel=stylesheet href="../../doc/docs.css">
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7
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8 <link rel="stylesheet" href="../../lib/codemirror.css">
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9 <script src="../../lib/codemirror.js"></script>
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10 <script src="../javascript/javascript.js"></script>
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11 <script src="pegjs.js"></script>
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12 <style>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
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13 </head>
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14 <body>
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15 <div id=nav>
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16 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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17
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18 <ul>
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19 <li><a href="../../index.html">Home</a>
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20 <li><a href="../../doc/manual.html">Manual</a>
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21 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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22 </ul>
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23 <ul>
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24 <li><a href="../index.html">Language modes</a>
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25 <li><a class=active href="#">PEG.js Mode</a>
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26 </ul>
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27 </div>
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28
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29 <article>
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30 <h2>PEG.js Mode</h2>
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31 <form><textarea id="code" name="code">
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32 /*
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33 * Classic example grammar, which recognizes simple arithmetic expressions like
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34 * "2*(3+4)". The parser generated from this grammar then computes their value.
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35 */
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36
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37 start
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38 = additive
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39
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40 additive
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41 = left:multiplicative "+" right:additive { return left + right; }
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42 / multiplicative
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43
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44 multiplicative
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45 = left:primary "*" right:multiplicative { return left * right; }
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46 / primary
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47
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48 primary
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49 = integer
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50 / "(" additive:additive ")" { return additive; }
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51
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52 integer "integer"
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53 = digits:[0-9]+ { return parseInt(digits.join(""), 10); }
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54
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55 letter = [a-z]+</textarea></form>
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56 <script>
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57 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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58 mode: {name: "pegjs"},
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59 lineNumbers: true
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60 });
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61 </script>
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62 <h3>The PEG.js Mode</h3>
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63 <p> Created by Forbes Lindesay.</p>
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64 </article>
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65 </body>
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66 </html>
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