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viewer.html
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viewer.html
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<!--
Copyright 2015 Google Inc. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!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>