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Demo.html
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<html>
<head>
<title>Huffman Coding Demo</title>
<script src="lib/jquery.js"></script>
<script src="src/priorityQueue.js"></script>
<script src="src/misc.js"></script>
<script src="src/huffman.js"></script>
</head>
<body>
<div class='column c1'>
<h2>Corpus:</h2>
<textarea class='corpus'></textarea>
<div class='buttons'>
<button class='generate'>Generate</button>
<button class='lorem'>Use Lorem Ipsum</button>
<button class='declaration'>Use Declaration of Independence</button>
</div>
<h2>Plain text:</h2>
<textarea type='text' class='encode'></textarea>
<div class='buttons'>
<button class='encode'>Encode</button>
<button class='encodeCorpus'>Use Corpus</button>
</div>
<h2>Coded text:</h2>
<textarea type='text' class='decode'></textarea>
<div class='buttons'>
<button class='decode'>Decode</button>
</div>
<div class='error'></div>
</div>
<div class='column c2'>
<h2>Your encoding scheme:</h2>
<ul class='coding'>
</ul>
<div class='efficiency'>
<h2>Efficiency:</h2>
<div class='standard'></div>
<div class='huffman'></div>
<div class='reduction'></div>
</div>
</div>
<style>
body {
font-family: courier;
}
.column {
margin: 0;
padding: 0 10px;
float: left;
}
.c1 {
width: 55%;
}
.c2 {
width: 40%;
}
.buttons {
margin-top: 5px;
margin-bottom: 10px;
}
.error {
color: #a00;
}
.efficiency {
margin-top: 20px;
float: left;
display: none;
}
body {
margin: 5px;
padding: 0 10px 20px;
}
h2 {
margin-top: 0;
margin-bottom: 5px;
}
textarea {
min-width: 80%;
min-height: 130px;
}
input {
min-width: 80%;
}
ul {
margin: 0;
padding: 0;
}
li {
display: block;
width: 48%;
margin: 0;
float: left;
white-space: pre-wrap;
}
</style>
<script>
var getDictionaryFromTree = function(tree) {
var result = {};
var traverse = function(node, current) {
if (node.val.length === 1) {
result[node.val] = current;
}
if (node.left) {
traverse(node.left, current + "0");
}
if (node.right) {
traverse(node.right, current + "1");
}
};
traverse(tree, "");
return result;
};
var calcEfficiency = function(uncodedLen, codedLen, charSetSize) {
var stdWordSize = Math.ceil(Math.log(charSetSize)/Math.LN2);
var stdCodedLen = stdWordSize*uncodedLen;
var reduction = ((stdCodedLen - codedLen)*100/stdCodedLen).toFixed(2) + "%";
$('.efficiency').show();
$('.efficiency .standard').text("With standard coding: " + stdCodedLen + " bits");
$('.efficiency .huffman').text("With Huffman coding: " + codedLen + " bits");
$('.efficiency .reduction').text("Reduction: " + reduction);
};
var huffman = null;
var triggerGenerateHuffman = function() {
$(".efficiency").hide();
var corpus = $("textarea.corpus").val();
huffman = makeHuffmanTree(corpus);
var dictionary = getDictionaryFromTree(huffman);
var ul = $('.coding');
ul.html('');
var pairs = Object
.keys(dictionary)
.sort(function(a, b) {
return a < b ? -1 : 1;
})
.forEach(function(key) {
var li = $("<li></li>");
li.text(key + " - " + dictionary[key]);
ul.append(li);
});
};
var triggerLorem = function() {
var corpus = $("textarea.corpus").val(loremIpsum);
triggerGenerateHuffman();
};
var triggerDeclaration = function() {
var corpus = $("textarea.corpus").val(declaration);
triggerGenerateHuffman();
};
var triggerEncode = function() {
$("textarea.decode").val('');
if (!huffman) {
$(".error").text("Please enter a corpus and create an encoding scheme first.")
return;
};
var input = $('textarea.encode').val();
if (!input) {
$(".error").text("Please enter some text to encode.")
return;
}
var output;
try {
output = encodeString(input, huffman);
} catch (ex) {
$('.error').text(ex.message);
return;
}
$('.error').text('');
$("textarea.decode").val(output);
calcEfficiency(input.length, output.length, huffman.val.length)
};
var triggerEncodeCorpus = function() {
$('textarea.encode').val($('textarea.corpus').val());
triggerEncode();
};
var triggerDecode = function() {
$(".efficiency").hide();
$("textarea.encode").val('');
if (!huffman) {
$(".error").text("Please enter a corpus and create an encoding scheme first.")
return;
};
var input = $('textarea.decode').val();
if (!input) {
$(".error").text("Please enter some text to decode.")
return;
}
var output;
try {
output = decodeString(input, huffman);
} catch (ex) {
$('.error').text(ex.message);
return;
}
$('.error').text('');
$("textarea.encode").val(output);
};
$(document).on('click', 'button.generate', triggerGenerateHuffman);
$(document).on('click', 'button.lorem', triggerLorem);
$(document).on('click', 'button.declaration', triggerDeclaration);
$(document).on('click', 'button.encode', triggerEncode);
$(document).on('click', 'button.encodeCorpus', triggerEncodeCorpus);
$(document).on('click', 'button.decode', triggerDecode);
</script>
</body>
</html>