@stdlib/esm/vendor/events.js

ES module distribution for Stdlib, a standard library for JavaScript and Node.js.

// MIT
// 
// Copyright Joyent, Inc. and other Node contributors.
// 
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
// 
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// 
var ReflectOwnKeys,R="object"==typeof Reflect?Reflect:null,ReflectApply=R&&"function"==typeof R.apply?R.apply:function(e,t,n){return Function.prototype.apply.call(e,t,n)};function ProcessEmitWarning(e){console&&console.warn&&console.warn(e)}ReflectOwnKeys=R&&"function"==typeof R.ownKeys?R.ownKeys:Object.getOwnPropertySymbols?function(e){return Object.getOwnPropertyNames(e).concat(Object.getOwnPropertySymbols(e))}:function(e){return Object.getOwnPropertyNames(e)};var NumberIsNaN=Number.isNaN||function(e){return e!=e};function EventEmitter(){EventEmitter.init.call(this)}var events=EventEmitter,once_1=once;EventEmitter.EventEmitter=EventEmitter,EventEmitter.prototype._events=void 0,EventEmitter.prototype._eventsCount=0,EventEmitter.prototype._maxListeners=void 0;var defaultMaxListeners=10;function checkListener(e){if("function"!=typeof e)throw new TypeError('The "listener" argument must be of type Function. Received type '+typeof e)}function _getMaxListeners(e){return void 0===e._maxListeners?EventEmitter.defaultMaxListeners:e._maxListeners}function _addListener(e,t,n,r){var i,s,o;if(checkListener(n),void 0===(s=e._events)?(s=e._events=Object.create(null),e._eventsCount=0):(void 0!==s.newListener&&(e.emit("newListener",t,n.listener?n.listener:n),s=e._events),o=s[t]),void 0===o)o=s[t]=n,++e._eventsCount;else if("function"==typeof o?o=s[t]=r?[n,o]:[o,n]:r?o.unshift(n):o.push(n),(i=_getMaxListeners(e))>0&&o.length>i&&!o.warned){o.warned=!0;var u=new Error("Possible EventEmitter memory leak detected. "+o.length+" "+String(t)+" listeners added. Use emitter.setMaxListeners() to increase limit");u.name="MaxListenersExceededWarning",u.emitter=e,u.type=t,u.count=o.length,ProcessEmitWarning(u)}return e}function onceWrapper(){if(!this.fired)return this.target.removeListener(this.type,this.wrapFn),this.fired=!0,0===arguments.length?this.listener.call(this.target):this.listener.apply(this.target,arguments)}function _onceWrap(e,t,n){var r={fired:!1,wrapFn:void 0,target:e,type:t,listener:n},i=onceWrapper.bind(r);return i.listener=n,r.wrapFn=i,i}function _listeners(e,t,n){var r=e._events;if(void 0===r)return[];var i=r[t];return void 0===i?[]:"function"==typeof i?n?[i.listener||i]:[i]:n?unwrapListeners(i):arrayClone(i,i.length)}function listenerCount(e){var t=this._events;if(void 0!==t){var n=t[e];if("function"==typeof n)return 1;if(void 0!==n)return n.length}return 0}function arrayClone(e,t){for(var n=new Array(t),r=0;r<t;++r)n[r]=e[r];return n}function spliceOne(e,t){for(;t+1<e.length;t++)e[t]=e[t+1];e.pop()}function unwrapListeners(e){for(var t=new Array(e.length),n=0;n<t.length;++n)t[n]=e[n].listener||e[n];return t}function once(e,t){return new Promise((function(n,r){function i(){void 0!==s&&e.removeListener("error",s),n([].slice.call(arguments))}var s;"error"!==t&&(s=function(n){e.removeListener(t,i),r(n)},e.once("error",s)),e.once(t,i)}))}Object.defineProperty(EventEmitter,"defaultMaxListeners",{enumerable:!0,get:function(){return defaultMaxListeners},set:function(e){if("number"!=typeof e||e<0||NumberIsNaN(e))throw new RangeError('The value of "defaultMaxListeners" is out of range. It must be a non-negative number. Received '+e+".");defaultMaxListeners=e}}),EventEmitter.init=function(){void 0!==this._events&&this._events!==Object.getPrototypeOf(this)._events||(this._events=Object.create(null),this._eventsCount=0),this._maxListeners=this._maxListeners||void 0},EventEmitter.prototype.setMaxListeners=function(e){if("number"!=typeof e||e<0||NumberIsNaN(e))throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received '+e+".");return this._maxListeners=e,this},EventEmitter.prototype.getMaxListeners=function(){return _getMaxListeners(this)},EventEmitter.prototype.emit=function(e){for(var t=[],n=1;n<arguments.length;n++)t.push(arguments[n]);var r="error"===e,i=this._events;if(void 0!==i)r=r&&void 0===i.error;else if(!r)return!1;if(r){var s;if(t.length>0&&(s=t[0]),s instanceof Error)throw s;var o=new Error("Unhandled error."+(s?" ("+s.message+")":""));throw o.context=s,o}var u=i[e];if(void 0===u)return!1;if("function"==typeof u)ReflectApply(u,this,t);else{var v=u.length,a=arrayClone(u,v);for(n=0;n<v;++n)ReflectApply(a[n],this,t)}return!0},EventEmitter.prototype.addListener=function(e,t){return _addListener(this,e,t,!1)},EventEmitter.prototype.on=EventEmitter.prototype.addListener,EventEmitter.prototype.prependListener=function(e,t){return _addListener(this,e,t,!0)},EventEmitter.prototype.once=function(e,t){return checkListener(t),this.on(e,_onceWrap(this,e,t)),this},EventEmitter.prototype.prependOnceListener=function(e,t){return checkListener(t),this.prependListener(e,_onceWrap(this,e,t)),this},EventEmitter.prototype.removeListener=function(e,t){var n,r,i,s,o;if(checkListener(t),void 0===(r=this._events))return this;if(void 0===(n=r[e]))return this;if(n===t||n.listener===t)0==--this._eventsCount?this._events=Object.create(null):(delete r[e],r.removeListener&&this.emit("removeListener",e,n.listener||t));else if("function"!=typeof n){for(i=-1,s=n.length-1;s>=0;s--)if(n[s]===t||n[s].listener===t){o=n[s].listener,i=s;break}if(i<0)return this;0===i?n.shift():spliceOne(n,i),1===n.length&&(r[e]=n[0]),void 0!==r.removeListener&&this.emit("removeListener",e,o||t)}return this},EventEmitter.prototype.off=EventEmitter.prototype.removeListener,EventEmitter.prototype.removeAllListeners=function(e){var t,n,r;if(void 0===(n=this._events))return this;if(void 0===n.removeListener)return 0===arguments.length?(this._events=Object.create(null),this._eventsCount=0):void 0!==n[e]&&(0==--this._eventsCount?this._events=Object.create(null):delete n[e]),this;if(0===arguments.length){var i,s=Object.keys(n);for(r=0;r<s.length;++r)"removeListener"!==(i=s[r])&&this.removeAllListeners(i);return this.removeAllListeners("removeListener"),this._events=Object.create(null),this._eventsCount=0,this}if("function"==typeof(t=n[e]))this.removeListener(e,t);else if(void 0!==t)for(r=t.length-1;r>=0;r--)this.removeListener(e,t[r]);return this},EventEmitter.prototype.listeners=function(e){return _listeners(this,e,!0)},EventEmitter.prototype.rawListeners=function(e){return _listeners(this,e,!1)},EventEmitter.listenerCount=function(e,t){return"function"==typeof e.listenerCount?e.listenerCount(t):listenerCount.call(e,t)},EventEmitter.prototype.listenerCount=listenerCount,EventEmitter.prototype.eventNames=function(){return this._eventsCount>0?ReflectOwnKeys(this._events):[]},events.once=once_1;export default events;