fsm/index.php at master · johnclara/fsm · GitHub

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<!doctype html>
<html><head>
	<title>Finite State Machine Designer - by Evan Wallace</title>
  <meta charset="utf-8">
	<style>

body {
	text-align: center;
	background: #DFDFDF;
	margin: 0 30px 100px 30px;
	font: 14px/18px 'Lucida Grande', 'Segoe UI', sans-serif;
}

h1 {
	font: bold italic 50px Georgia, serif;
}

canvas {
	display: block;
	max-width: 800px;
	background: white;
	border-radius: 20px;
	-moz-border-radius: 20px;
	margin: 10px auto;
}

a {
	color: black;
}

div {
	margin: 30px auto;
	text-align: left;
	max-width: 800px;
}

.error {
	display: block;
	color: red;
	font-size: 28px;
	line-height: 30px;
	padding: 30px;
}

.dfaError {
	display: block;
	color: red;
	font-size: 28px;
	line-height: 30px;
	padding: 30px;
}

p {
	margin: 30px 0;
	line-height: 20px;
}

.center {
	text-align: center;
}

textarea {
	display: none;
	width: 75%;
	height: 400px;
	margin: 0 auto;
}

#deleteButton {
  float: right;
}

  </style>
	<script src="fsm.js"></script>
	<script>

/*
 * base64.js - Base64 encoding and decoding functions
 *
 * See: http://developer.mozilla.org/en/docs/DOM:window.btoa
 *      http://developer.mozilla.org/en/docs/DOM:window.atob
 *
 * Copyright (c) 2007, David Lindquist <david.lindquist@gmail.com>
 * Released under the MIT license
 */

if (typeof btoa == 'undefined') {
    function btoa(str) {
        var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
        var encoded = [];
        var c = 0;
        while (c < str.length) {
            var b0 = str.charCodeAt(c++);
            var b1 = str.charCodeAt(c++);
            var b2 = str.charCodeAt(c++);
            var buf = (b0 << 16) + ((b1 || 0) << 8) + (b2 || 0);
            var i0 = (buf & (63 << 18)) >> 18;
            var i1 = (buf & (63 << 12)) >> 12;
            var i2 = isNaN(b1) ? 64 : (buf & (63 << 6)) >> 6;
            var i3 = isNaN(b2) ? 64 : (buf & 63);
            encoded[encoded.length] = chars.charAt(i0);
            encoded[encoded.length] = chars.charAt(i1);
            encoded[encoded.length] = chars.charAt(i2);
            encoded[encoded.length] = chars.charAt(i3);
        }
        return encoded.join('');
    }
}

	</script>
</head><body>
	<h1>Finite State Machine Designer</h1>
  <p id="errorMessage"></p>
	<div>
    <button id="isDFAButton">Is DFA?</button>
    <input id="inputField">
    <button id="runButton">Run</button>
    <button id="deleteButton">Delete Selected</button>
	</div>
	<canvas id="canvas" width="800" height="600">
		<span class="error">Your browser does not support<br>the HTML5 &lt;canvas&gt; element</span>
	</canvas>
	<div>
		<p class="center">Export as: <a href="javascript:saveAsPNG()">PNG</a> | <a href="javascript:saveAsSVG()">SVG</a> | <a href="javascript:saveAsLaTeX()">LaTeX</a></p>
		<textarea id="output"></textarea>
		<p>The big white box above is the FSM designer.&nbsp; Here's how to use it:</p>
		<ul>
			<li><b>Add a state:</b> double-click on the canvas</li>
			<li><b>Add an arrow:</b> shift-drag on the canvas</li>
			<li><b>Move something:</b> drag it around</li>
			<li><b>Delete something:</b> click it and press the delete key (not the backspace key)</li>
		</ul><ul>
			<li><b>Make accept state:</b> double-click on an existing state</li>
			<li><b>Type numeric subscript:</b> put an underscore before the number (like "S_0")</li>
			<li><b>Type greek letter:</b> put a backslash before it (like "\beta")</li>
		</ul>
		<p>This was made in HTML5 and JavaScript using the canvas element.</p>
	</div>
	<p>Created by <a href="http://madebyevan.com/">Evan Wallace</a> in 2010 and extended by John Clara
  in 2017</p>
	<p><a href="http://madebyevan.com/fsm">Original App</a></p>
</body></html>