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<html>
  <head>
    <title>CodeMirror: PEG.js Mode</title>
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    <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
        });