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<!doctype html>
<html>
  <head>
    <title>CodeMirror: PEG.js Mode</title>
    <meta charset="utf-8"/>
    <link rel=stylesheet href="../../doc/docs.css">

<ul>
        <li><a href="../../index.html">Home</a>
        <li><a href="../../doc/manual.html">Manual</a>
        <li><a href="https://github.com/codemirror/codemirror">Code</a>
      </ul>
      <ul>
        <li><a href="../index.html">Language modes</a>
        <li><a class=active href="#">PEG.js Mode</a>
      </ul>
    </div>

<article>
      <h2>PEG.js Mode</h2>
      <form><textarea id="code" name="code">
/*
 * Classic example grammar, which recognizes simple arithmetic expressions like
 * "2*(3+4)". The parser generated from this grammar then computes their value.
 */

start
  = additive

additive
  = left:multiplicative "+" right:additive { return left + right; }
  / multiplicative

multiplicative
  = left:primary "*" right:multiplicative { return left * right; }
  / primary

primary
  = integer
  / "(" additive:additive ")" { return additive; }

integer "integer"
  = digits:[0-9]+ { return parseInt(digits.join(""), 10); }

letter = [a-z]+</textarea></form>
      <script>
        var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
          mode: {name: "pegjs"},
          lineNumbers: true
        });
      </script>
      <h3>The PEG.js Mode</h3>
      <p> Created by Forbes Lindesay.</p>
    </article>
  </body>
</html>

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