ast/playground.html at master · levp/ast · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>

    <style>
        body {
            font-family: verdana, arial, sans-serif;
            font-size: 20px;
            background-color: #cccccc;
        }

        input {
            padding: 0;
            margin: 0;
            font-size: inherit;
        }

        input[type="button"] {
            padding: 2px;;
        }
    </style>
</head>
<body>

<div>
    <label>Enter an expression: <input type="text" id="input"></label>
</div>
<div>
    <input type="button" id="evaluate-btn" value="Evaluate">
</div>
<div>
    Result: <span id="output"></span>
</div>

<script src="shunting_yard.js"></script>
<script>
    var inputField = document.getElementById("input");
    var outputElem = document.getElementById("output");
    var evaluateBtn = document.getElementById("evaluate-btn");

    evaluateBtn.addEventListener("click", function () {
        var expr = inputField.value;
        var result;

        try {
            var tokens = Tokenizer.tokenize(expr);
            var ast = AST.create(tokens);
            result = ast.evaluate();
        } catch (ex) {
            result = "Error: " + ex.message;
        }

        outputElem.innerHTML = result;
    });


</script>

</body>
</html>