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mirror.js
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mirror.js
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// Copyright 2012 Google Inc.
//
// 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.
var receiverURL = 'ws://' + location.host + '/receiver';
window.addEventListener('DOMContentLoaded', function() {
var base;
var mirror = new TreeMirror(document, {
createElement: function(tagName) {
if (tagName == 'SCRIPT') {
var node = document.createElement('NO-SCRIPT');
node.style.display = 'none';
return node;
}
if (tagName == 'HEAD') {
var node = document.createElement('HEAD');
node.appendChild(document.createElement('BASE'));
node.firstChild.href = base;
return node;
}
}
});
var socket = new WebSocket(receiverURL);
function clearPage() {
while (document.firstChild) {
document.removeChild(document.firstChild);
}
}
function handleMessage(msg) {
if (msg.clear)
clearPage();
else if (msg.base)
base = msg.base;
else
mirror[msg.f].apply(mirror, msg.args);
}
socket.onmessage = function(event) {
var msg = JSON.parse(event.data);
if (msg instanceof Array) {
msg.forEach(function(subMessage) {
handleMessage(JSON.parse(subMessage));
});
} else {
handleMessage(msg);
}
}
socket.onclose = function() {
socket = new WebSocket(receiverURL);
}
});