petitparser.github.io/examples/math/eval.html at main · petitparser/petitparser.github.io · GitHub

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Math Evaluator</title>
  <link rel="stylesheet"
        href="//cdn.rawgit.com/milligram/milligram/master/dist/milligram.min.css">
  <style>
    #input, #result, #tree { font-family: monospace; width: 100%; }
    .error { color: red; }
  </style>
</head>
<body>
  <h1>Math Evaluator</h1>

  <h2>Expression</h2>
  <input type="text" id="input" value="1 + 2 * 3"/>

  <h2>Result</h2>
  <p id="result"></p>

  <h2>Tree</h2>
  <p id="tree"></p>

  <script src="eval.dart.js"></script>
  <script async src="https://www.googletagmanager.com/gtag/js?id=G-QK0KCHXW3F"></script>
  <script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments);}gtag('js', new Date());gtag('config', 'G-QK0KCHXW3F');</script>
</body>
</html>