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177 lines
4.2 KiB
177 lines
4.2 KiB
'use strict';
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/**
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* Class representing an event.
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*
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* @private
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*/
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class Event {
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/**
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* Create a new `Event`.
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*
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* @param {String} type The name of the event
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* @param {Object} target A reference to the target to which the event was dispatched
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*/
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constructor(type, target) {
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this.target = target;
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this.type = type;
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}
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}
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/**
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* Class representing a message event.
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*
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* @extends Event
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* @private
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*/
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class MessageEvent extends Event {
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/**
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* Create a new `MessageEvent`.
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*
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* @param {(String|Buffer|ArrayBuffer|Buffer[])} data The received data
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* @param {WebSocket} target A reference to the target to which the event was dispatched
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*/
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constructor(data, target) {
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super('message', target);
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this.data = data;
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}
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}
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/**
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* Class representing a close event.
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*
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* @extends Event
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* @private
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*/
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class CloseEvent extends Event {
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/**
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* Create a new `CloseEvent`.
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*
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* @param {Number} code The status code explaining why the connection is being closed
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* @param {String} reason A human-readable string explaining why the connection is closing
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* @param {WebSocket} target A reference to the target to which the event was dispatched
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*/
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constructor(code, reason, target) {
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super('close', target);
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this.wasClean = target._closeFrameReceived && target._closeFrameSent;
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this.reason = reason;
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this.code = code;
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}
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}
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/**
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* Class representing an open event.
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*
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* @extends Event
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* @private
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*/
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class OpenEvent extends Event {
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/**
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* Create a new `OpenEvent`.
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*
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* @param {WebSocket} target A reference to the target to which the event was dispatched
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*/
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constructor(target) {
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super('open', target);
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}
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}
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/**
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* Class representing an error event.
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*
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* @extends Event
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* @private
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*/
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class ErrorEvent extends Event {
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/**
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* Create a new `ErrorEvent`.
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*
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* @param {Object} error The error that generated this event
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* @param {WebSocket} target A reference to the target to which the event was dispatched
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*/
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constructor(error, target) {
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super('error', target);
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this.message = error.message;
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this.error = error;
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}
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}
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/**
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* This provides methods for emulating the `EventTarget` interface. It's not
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* meant to be used directly.
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*
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* @mixin
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*/
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const EventTarget = {
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/**
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* Register an event listener.
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*
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* @param {String} type A string representing the event type to listen for
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* @param {Function} listener The listener to add
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* @param {Object} options An options object specifies characteristics about
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* the event listener
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* @param {Boolean} options.once A `Boolean`` indicating that the listener
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* should be invoked at most once after being added. If `true`, the
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* listener would be automatically removed when invoked.
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* @public
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*/
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addEventListener(type, listener, options) {
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if (typeof listener !== 'function') return;
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function onMessage(data) {
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listener.call(this, new MessageEvent(data, this));
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}
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function onClose(code, message) {
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listener.call(this, new CloseEvent(code, message, this));
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}
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function onError(error) {
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listener.call(this, new ErrorEvent(error, this));
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}
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function onOpen() {
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listener.call(this, new OpenEvent(this));
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}
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const method = options && options.once ? 'once' : 'on';
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if (type === 'message') {
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onMessage._listener = listener;
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this[method](type, onMessage);
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} else if (type === 'close') {
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onClose._listener = listener;
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this[method](type, onClose);
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} else if (type === 'error') {
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onError._listener = listener;
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this[method](type, onError);
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} else if (type === 'open') {
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onOpen._listener = listener;
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this[method](type, onOpen);
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} else {
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this[method](type, listener);
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}
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},
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/**
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* Remove an event listener.
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*
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* @param {String} type A string representing the event type to remove
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* @param {Function} listener The listener to remove
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* @public
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*/
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removeEventListener(type, listener) {
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const listeners = this.listeners(type);
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for (let i = 0; i < listeners.length; i++) {
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if (listeners[i] === listener || listeners[i]._listener === listener) {
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this.removeListener(type, listeners[i]);
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}
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}
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}
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};
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module.exports = EventTarget;
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