b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
104 lines
2.1 KiB
JavaScript
104 lines
2.1 KiB
JavaScript
'use strict';
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/**
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* Exports
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* @ignore
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*/
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module.exports = Emitter;
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/**
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* Simple logger
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*
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* @type {Function}
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* @private
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*/
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var debug = 0 ? console.log.bind(console, '[Emitter]') : () => {};
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/**
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* Create new `Emitter`
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*
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* @class Emitter
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*/
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function Emitter(host) {
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if (host) return Object.assign(host, Emitter.prototype);
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}
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Emitter.prototype = {
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/**
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* Add an event listener.
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*
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* It is possible to subscript to * events.
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*
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* @param {String} type
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* @param {Function} callback
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* @return {this} for chaining
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*/
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on: function(type, callback) {
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debug('on', type, callback);
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if (!this._callbacks) this._callbacks = {};
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if (!this._callbacks[type]) this._callbacks[type] = [];
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this._callbacks[type].push(callback);
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return this;
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},
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/**
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* Remove an event listener.
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*
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* @example
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*
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* emitter.off('name', fn); // remove one callback
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* emitter.off('name'); // remove all callbacks for 'name'
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* emitter.off(); // remove all callbacks
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*
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* @param {String} [type]
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* @param {Function} [callback]
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* @return {this} for chaining
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*/
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off: function(type, callback) {
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debug('off', type, callback);
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if (this._callbacks) {
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switch (arguments.length) {
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case 0: this._callbacks = {}; break;
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case 1: delete this._callbacks[type]; break;
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default:
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var typeListeners = this._callbacks[type];
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if (!typeListeners) return;
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var i = typeListeners.indexOf(callback);
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if (~i) typeListeners.splice(i, 1);
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}
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}
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return this;
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},
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/**
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* Emit an event.
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*
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* @example
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*
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* emitter.emit('name', { some: 'data' });
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*
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* @param {String} type
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* @param {*} [data]
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* @return {this} for chaining
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*/
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emit: function(type, data) {
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debug('emit', type, data);
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if (this._callbacks) {
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var fns = this._callbacks[type] || [];
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fns = fns.concat(this._callbacks['*'] || []);
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for (var i = 0; i < fns.length; i++) fns[i].call(this, data, type);
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}
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return this;
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}
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};
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var p = Emitter.prototype;
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p['off'] = p.off;
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p['on'] = p.on;
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