// http://whatsock.com/modules/accessible_chat_dialog_module/js/fb_chat.js
/*!
The Facebook Chat Bookmarklet - v1.0
For use on Facebook.com when a chat dialog is open.
Bryan Garaventa, WhatSock
*/

window.enableWSFBChat = function(){

var getEl = function(e){
if (document.getElementById) return document.getElementById(e);
else if (document.all) return document.all[e];
else return null;
},

getElsByTag = function(tag, root){
var l = [],
t = tag || '*',
r = root || document;
if (r.getElementsByTagName)
l = r.getElementsByTagName(t);
if (!l || !l.length){
if (t === '*' && r.all) l = r.all;
else if (r.all && r.all.tags) l = r.all.tags(t);
}
return l;
},

createEl = function(t){
var o = document.createElement(t);
if (arguments.length === 1) return o;
if (arguments[1]) setAttr(o, arguments[1]);
if (arguments[2]) css(o, arguments[2]);
return o;
},

createAttr = function(a){
return document.createAttribute(a);
},

css = function(obj, p, v){
if (!obj) return null;
var o = isArray(obj) ? obj : [obj],
check = 'top left bottom right width height';
for (var i = 0; i < o.length; i++){
if (typeof p === 'string'){
try {
o[i].style[xCamelize(p)] = check.indexOf(p) !== -1 && typeof v === 'number' ? v + 'px' : v;
} catch (ex) {
}
} else if (typeof p === 'object'){
for (var a = 1; a < arguments.length; a++){
for (var n in arguments[a]){
try {
o[i].style[xCamelize(n)] = check.indexOf(n) !== -1 && typeof arguments[a][n] === 'number' ? arguments[a][n] + 'px' : arguments[a][n];
} catch (ex) {
}
}
}
}
}
return obj;
},

trim = function(str){
return str.replace(/^\s+|\s+$/g, '');
},

setAttr = function(obj, name, value){
if (!obj) return null;
if (typeof name === 'string'){
var a = createAttr(name);
a.nodeValue = value;
obj.setAttributeNode(a);
} else if (typeof name === 'object'){
for (n in name){
var a = createAttr(n);
a.nodeValue = name[n];
obj.setAttributeNode(a);
}
}
return obj;
},

isArray = function(v){
return v && typeof v === 'object' && typeof v.length === 'number' && typeof v.splice === 'function' && !(v.propertyIsEnumerable('length'));
},

hasClass = function(obj, cn){
if (!obj || !obj.className) return false;
var names = cn.split(' '),
i = 0;
for (var n = 0; n < names.length; n++){
if (obj.className.indexOf(names[n]) !== -1) i += 1;
}
if (i === names.length) return true;
return false;
},

getElsByClass = function(cn, tag, root){
var tag = tag || '*',
root = root || document;
if (root.getElementsByClassName && tag === '*') return root.getElementsByClassName(cn);
var a = getElsByTag(tag, root),
r = [],
names = cn.split(' ');
for (var i = 0; i < a.length; i++){
var c = 0;
for (var n = 0; n < names.length; n++){
if (hasClass(a[i], names[n])) c += 1;
}
if (c === names.length) r.push(a[i]);
}
return r;
},

firstChild = function(e, t){
var e = e ? e.firstChild : null;
while(e){
if (e.nodeType === 1 && (!t || t.toLowerCase() === e.nodeName.toLowerCase())) break;
e = e.nextSibling;
}
return e;
},

lastChild = function(e, t){
var e = e ? e.lastChild : null;
while(e){
if (e.nodeType === 1 && (!t || t.toLowerCase() === e.nodeName.toLowerCase())) break;
e = e.previousSibling;
}
return e;
},

prevSib = function(e, t){
var e = e ? e.previousSibling : null;
while(e){
if (e.nodeType === 1 && (!t || t.toLowerCase() === e.nodeName.toLowerCase())) break;
e = e.previousSibling;
}
return e;
},

xCamelize = function(cssPropStr){
var i, c, a, s;
a = cssPropStr.split('-');
s = a[0];
for (i=1; i<a.length; i++) {
c = a[i].charAt(0);
s += a[i].replace(c, c.toUpperCase());
}
return s;
},

sraCSS = {
fontSize: 0,
height: 0,
width: 0,
position: 'absolute',
overflow: 'hidden',
zIndex: -1000
},

track = {
hist: {},
conv: [],
},

chat = getEl('fbDockChatTabs'),

edit = getElsByTag('textarea', chat)[0],

conv = getElsByClass('conversation', 'div', chat)[0],

check = function(){
if (!conv) return clearInterval(track.timer);
var d = lastChild(conv),
v = trim(d.innerText || d.textContent);
if (v && !track.hist[v]){
track.hist[v] = true;
var sy = getElsByTag('img', d)[0].alt + ' ';
sy += trim(d.innerText ? lastChild(lastChild(d, 'div'), 'div').innerText : lastChild(lastChild(d, 'div'), 'div').textContent);
track.conv.push(sy);
announce(sy);
}
},

addEv = function(o, n, fn, cap){
if (!o) return;
n = n.toLowerCase();
if (o.addEventListener) o.addEventListener(n, fn, cap || false);
else if (o.attachEvent) o.attachEvent('on' + n, fn);
},

key = {
val: 49,
alt: false,
ctrl: true,
shift: true
},
pressed = {},
changePressed = function(ev){
pressed.alt = ev.altKey;
pressed.ctrl = ev.ctrlKey;
pressed.shift = ev.shiftKey;
},

getText = function(n){
if (!n) return '';
return n.innerText || n.textContent || '';
},

announce = function(strm, loop, noRep){
if (strm && strm.nodeName && strm.nodeType === 1) strm = getText(strm);
var obj = strm || this,
str = strm ? strm : this.toString();
if (typeof str !== 'string') return obj;
if (!loop) String.announce.alertMsgs.push(str);
if ((String.announce.alertMsgs.length == 1 || loop)){
var timeLength = String.announce.baseDelay + (String.announce.iterate(String.announce.alertMsgs[0], /\s|\,|\.|\:|\;|\!|\(|\)|\/|\?|\@|\#|\$|\%|\^|\&|\*|\\|\-|\_|\+|\=/g) * String.announce.charMultiplier);
if (noRep && String.announce.lastMsg == String.announce.alertMsgs[0]){}
else {
String.announce.lastMsg = String.announce.alertMsgs[0];
String.announce.placeHolder.innerHTML = String.announce.alertMsgs[0];
}
String.announce.alertTO = setTimeout(function(){
String.announce.placeHolder.innerHTML = '';
String.announce.alertMsgs.shift();
if (String.announce.alertMsgs.length >= 1)
announce(String.announce.alertMsgs[0], true);
}, timeLength);
}
return obj;
};

String.announce = {
alertMsgs: [],
clear: function(){
if (this.alertTO) clearTimeout(this.alertTO);
this.alertMsgs.length = 0;
},
baseDelay: 1000,
charMultiplier: 10,
lastMsg: '',
iterate: function(str, regExp){
var iCount = 0;
str.replace(regExp, function(){
iCount++;
});
return iCount;
}
};

if (!String.announce.placeHolder){
String.announce.placeHolder = createEl('span', {
role: 'status',
'aria-live': 'assertive',
'aria-relevant': 'all'
}, sraCSS);
document.body.appendChild(String.announce.placeHolder);
}

setAttr(prevSib(conv), {
role: 'heading',
'aria-level': 3
});

setAttr(edit, 'accesskey', 'm');
setAttr(edit.parentNode, 'role', 'dialog');

addEv(edit, 'keydown', function(ev){
var e = ev ? ev : window.event;
changePressed(e);
});
addEv(edit, 'keyup', function(ev){
var e = ev ? ev : window.event,
k = e.which || e.keyCode;
if (k == key.val && pressed.ctrl == key.ctrl && pressed.alt == key.alt && pressed.shift == key.shift){
var r = track.conv;
r.reverse();
for (var x = 4; x >= 0; x--){
if (r[x]) announce(r[x]);
}
if (e.preventDefault) e.preventDefault();
else e.returnValue = false;
}
changePressed(e);
});

announce('The Facebook Chat Bookmarklet is activated. Press Control+Shift+1 to hear the last 5 messages announced.');
check();
track.timer = setInterval(check, 1000);

};

window.enableWSFBChat();
</code></pre>