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/**
* socket.io
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
(function (exports, io) {
/**
* Parser namespace.
*
* @namespace
*/
var parser = exports.parser = {};
/**
* Packet types.
*/
var packets = parser.packets = [
'disconnect'
, 'connect'
, 'heartbeat'
, 'message'
, 'json'
, 'event'
, 'ack'
, 'error'
, 'noop'
];
/**
* Errors reasons.
*/
var reasons = parser.reasons = [
'transport not supported'
, 'client not handshaken'
, 'unauthorized'
];
/**
* Errors advice.
*/
var advice = parser.advice = [
'reconnect'
];
/**
* Shortcuts.
*/
var JSON = io.JSON
, indexOf = io.util.indexOf;
/**
* Encodes a packet.
*
* @api private
*/
parser.encodePacket = function (packet) {
var type = indexOf(packets, packet.type)
, id = packet.id || ''
, endpoint = packet.endpoint || ''
, ack = packet.ack
, data = null;
switch (packet.type) {
case 'error':
var reason = packet.reason ? indexOf(reasons, packet.reason) : ''
, adv = packet.advice ? indexOf(advice, packet.advice) : '';
if (reason !== '' || adv !== '')
data = reason + (adv !== '' ? ('+' + adv) : '');
break;
case 'message':
if (packet.data !== '')
data = packet.data;
break;
case 'event':
var ev = { name: packet.name };
if (packet.args && packet.args.length) {
ev.args = packet.args;
}
data = JSON.stringify(ev);
break;
case 'json':
data = JSON.stringify(packet.data);
break;
case 'connect':
if (packet.qs)
data = packet.qs;
break;
case 'ack':
data = packet.ackId
+ (packet.args && packet.args.length
? '+' + JSON.stringify(packet.args) : '');
break;
}
// construct packet with required fragments
var encoded = [
type
, id + (ack == 'data' ? '+' : '')
, endpoint
];
// data fragment is optional
if (data !== null && data !== undefined)
encoded.push(data);
return encoded.join(':');
};
/**
* Encodes multiple messages (payload).
*
* @param {Array} messages
* @api private
*/
parser.encodePayload = function (packets) {
var decoded = '';
if (packets.length == 1)
return packets[0];
for (var i = 0, l = packets.length; i < l; i++) {
var packet = packets[i];
decoded += '\ufffd' + packet.length + '\ufffd' + packets[i];
}
return decoded;
};
/**
* Decodes a packet
*
* @api private
*/
var regexp = /([^:]+):([0-9]+)?(\+)?:([^:]+)?:?([\s\S]*)?/;
parser.decodePacket = function (data) {
var pieces = data.match(regexp);
if (!pieces) return {};
var id = pieces[2] || ''
, data = pieces[5] || ''
, packet = {
type: packets[pieces[1]]
, endpoint: pieces[4] || ''
};
// whether we need to acknowledge the packet
if (id) {
packet.id = id;
if (pieces[3])
packet.ack = 'data';
else
packet.ack = true;
}
// handle different packet types
switch (packet.type) {
case 'error':
var pieces = data.split('+');
packet.reason = reasons[pieces[0]] || '';
packet.advice = advice[pieces[1]] || '';
break;
case 'message':
packet.data = data || '';
break;
case 'event':
try {
var opts = JSON.parse(data);
packet.name = opts.name;
packet.args = opts.args;
} catch (e) { }
packet.args = packet.args || [];
break;
case 'json':
try {
packet.data = JSON.parse(data);
} catch (e) { }
break;
case 'connect':
packet.qs = data || '';
break;
case 'ack':
var pieces = data.match(/^([0-9]+)(\+)?(.*)/);
if (pieces) {
packet.ackId = pieces[1];
packet.args = [];
if (pieces[3]) {
try {
packet.args = pieces[3] ? JSON.parse(pieces[3]) : [];
} catch (e) { }
}
}
break;
case 'disconnect':
case 'heartbeat':
break;
};
return packet;
};
/**
* Decodes data payload. Detects multiple messages
*
* @return {Array} messages
* @api public
*/
parser.decodePayload = function (data) {
// IE doesn't like data[i] for unicode chars, charAt works fine
if (data.charAt(0) == '\ufffd') {
var ret = [];
for (var i = 1, length = ''; i < data.length; i++) {
if (data.charAt(i) == '\ufffd') {
ret.push(parser.decodePacket(data.substr(i + 1).substr(0, length)));
i += Number(length) + 1;
length = '';
} else {
length += data.charAt(i);
}
}
return ret;
} else {
return [parser.decodePacket(data)];
}
};
})(
'undefined' != typeof io ? io : module.exports
, 'undefined' != typeof io ? io : module.parent.exports
);
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