1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/**
@namespace
*/
(function(module, ns) {
/**
* Constructor
*
* @param {Object} list of events to add onto responder.
*/
function Responder(events) {
this._$events = Object.create(null);
if (typeof(events) !== 'undefined') {
this.addEventListener(events);
}
};
/**
* Stringifies request to websocket
*
*
* @param {String} command command name.
* @param {Object} data object to be sent over the wire.
* @return {String} json object.
*/
Responder.stringify = function stringify(command, data) {
return JSON.stringify([command, data]);
};
/**
* Parses request from WebSocket.
*
* @param {String} json json string to translate.
* @return {Object} ex: { event: 'test', data: {} }.
*/
Responder.parse = function parse(json) {
var data;
try {
data = (json.forEach) ? json : JSON.parse(json);
} catch (e) {
throw new Error("Could not parse json: '" + json + '"');
}
return {event: data[0], data: data[1]};
};
Responder.prototype = {
parse: Responder.parse,
stringify: Responder.stringify,
/**
* Events on this instance
*
* @type Object
*/
_$events: null,
/**
* Recieves json string event and dispatches an event.
*
* @param {String|Object} json data object to respond to.
* @param {String} json.event event to emit.
* @param {Object} json.data data to emit with event.
* @param {Object} [params] option number of params to pass to emit.
* @return {Object} result of WebSocketCommon.parse.
*/
respond: function respond(json) {
var event = Responder.parse(json),
args = Array.prototype.slice.call(arguments).slice(1);
args.unshift(event.data);
args.unshift(event.event);
this.emit.apply(this, args);
return event;
},
//TODO: Extract event emitter logic
/**
* Adds an event listener to this object.
*
*
* @param {String} type event name.
* @param {Function} callback event callback.
*/
addEventListener: function addEventListener(type, callback) {
var event;
if (typeof(callback) === 'undefined' && typeof(type) === 'object') {
for (event in type) {
if (type.hasOwnProperty(event)) {
this.addEventListener(event, type[event]);
}
}
return this;
}
if (!(type in this._$events)) {
this._$events[type] = [];
}
this._$events[type].push(callback);
return this;
},
/**
* Adds an event listener which will
* only fire once and then remove itself.
*
*
* @param {String} type event name.
* @param {Function} callback fired when event is emitted.
*/
once: function once(type, callback) {
var self = this;
function onceCb() {
self.removeEventListener(type, onceCb);
callback.apply(this, arguments);
}
this.addEventListener(type, onceCb);
return this;
},
/**
* Emits an event.
*
* Accepts any number of additional arguments to pass unto
* event listener.
*
* @param {String} eventName name of the event to emit.
* @param {Object} [arguments] additional arguments to pass.
*/
emit: function emit() {
var args = Array.prototype.slice.call(arguments),
event = args.shift(),
eventList,
self = this;
if (event in this._$events) {
eventList = this._$events[event];
eventList.forEach(function(callback) {
callback.apply(self, args);
});
}
return this;
},
/**
* Removes all event listeners for a given event type
*
*
* @param {String} event event type to remove.
*/
removeAllEventListeners: function removeAllEventListeners(name) {
if (name in this._$events) {
//reuse array
this._$events[name].length = 0;
}
return this;
},
/**
* Removes a single event listener from a given event type
* and callback function.
*
*
* @param {String} eventName event name.
* @param {Function} callback same instance of event handler.
*/
removeEventListener: function removeEventListener(name, callback) {
var i, length, events;
if (!(name in this._$events)) {
return false;
}
events = this._$events[name];
for (i = 0, length = events.length; i < length; i++) {
if (events[i] && events[i] === callback) {
events.splice(i, 1);
return true;
}
}
return false;
}
};
Responder.prototype.on = Responder.prototype.addEventListener;
module.exports = Responder;
}.apply(
this,
(this.Webcals) ?
[Webcals('responder'), Webcals] :
[module, require('./webcals')]
));
|
