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viewer.html
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viewer.html
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<input type="file" id="file">
<script>
~function() {
function ViewBuilder(root) {
this.root = root;
this.elementStack = null;
this.commandHandlers = {
// Base
'b': function(command) {
var base = this.root.appendChild(document.createElement('base'));
base.href = command.v;
}.bind(this),
// Open Element
'n': function(command) {
var element = document.createElement(command.n);
this.elementStack.push(element);
}.bind(this),
'a': function(command) {
this.top().setAttribute(command.n, command.v);
}.bind(this),
// Close Element
'/': function(command) {
var element = this.elementStack.pop();
// intentionally crippling script nodes for now
if (element.tagName == 'SCRIPT')
element.setAttribute('type', 'dead');
this.top().appendChild(element);
}.bind(this),
// Text
't': function(command) {
this.top().appendChild(document.createTextNode(command.v));
}.bind(this),
// Comment
'c': function(command) {
this.top().appendChild(document.createComment(command.v));
}.bind(this),
}
}
ViewBuilder.prototype.top = function() {
return this.elementStack[this.elementStack.length - 1];
}
ViewBuilder.prototype.build = function(data) {
this.elementStack = [this.root];
this.root.textContent = '';
data.forEach(function(command) {
var handler = this.commandHandlers[command.t];
(handler || nil)(command);
}, this);
function nil() {}
}
document.getElementById('file').addEventListener('change', function(evt) {
if (!evt.target.files.length)
return;
var reader = new FileReader();
reader.addEventListener('load', function(evt) {
var data = JSON.parse(evt.target.result);
var viewer = new ViewBuilder(document.documentElement);
console.time('Build DOM');
viewer.build(data);
console.timeEnd('Build DOM');
});
reader.readAsText(evt.target.files[0]);
});
}();
</script>
</body>
</html>