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Mini Shell
Mini Shell
/*!
* EventEmitter2
* https://github.com/hij1nx/EventEmitter2
*
* Copyright (c) 2013 hij1nx
* Licensed under the MIT license.
*/
;!function(undefined) {
var isArray = Array.isArray ? Array.isArray : function _isArray(obj) {
return Object.prototype.toString.call(obj) === "[object Array]";
};
var defaultMaxListeners = 10;
function init() {
this._events = {};
if (this._conf) {
configure.call(this, this._conf);
}
}
function configure(conf) {
if (conf) {
this._conf = conf;
conf.delimiter && (this.delimiter = conf.delimiter);
this._maxListeners = conf.maxListeners !== undefined ? conf.maxListeners : defaultMaxListeners;
conf.wildcard && (this.wildcard = conf.wildcard);
conf.newListener && (this._newListener = conf.newListener);
conf.removeListener && (this._removeListener = conf.removeListener);
conf.verboseMemoryLeak && (this.verboseMemoryLeak = conf.verboseMemoryLeak);
if (this.wildcard) {
this.listenerTree = {};
}
} else {
this._maxListeners = defaultMaxListeners;
}
}
function logPossibleMemoryLeak(count, eventName) {
var errorMsg = '(node) warning: possible EventEmitter memory ' +
'leak detected. ' + count + ' listeners added. ' +
'Use emitter.setMaxListeners() to increase limit.';
if(this.verboseMemoryLeak){
errorMsg += ' Event name: ' + eventName + '.';
}
if(typeof process !== 'undefined' && process.emitWarning){
var e = new Error(errorMsg);
e.name = 'MaxListenersExceededWarning';
e.emitter = this;
e.count = count;
process.emitWarning(e);
} else {
console.error(errorMsg);
if (console.trace){
console.trace();
}
}
}
function EventEmitter(conf) {
this._events = {};
this._newListener = false;
this._removeListener = false;
this.verboseMemoryLeak = false;
configure.call(this, conf);
}
EventEmitter.EventEmitter2 = EventEmitter; // backwards compatibility for exporting EventEmitter property
//
// Attention, function return type now is array, always !
// It has zero elements if no any matches found and one or more
// elements (leafs) if there are matches
//
function searchListenerTree(handlers, type, tree, i) {
if (!tree) {
return [];
}
var listeners=[], leaf, len, branch, xTree, xxTree, isolatedBranch, endReached,
typeLength = type.length, currentType = type[i], nextType = type[i+1];
if (i === typeLength && tree._listeners) {
//
// If at the end of the event(s) list and the tree has listeners
// invoke those listeners.
//
if (typeof tree._listeners === 'function') {
handlers && handlers.push(tree._listeners);
return [tree];
} else {
for (leaf = 0, len = tree._listeners.length; leaf < len; leaf++) {
handlers && handlers.push(tree._listeners[leaf]);
}
return [tree];
}
}
if ((currentType === '*' || currentType === '**') || tree[currentType]) {
//
// If the event emitted is '*' at this part
// or there is a concrete match at this patch
//
if (currentType === '*') {
for (branch in tree) {
if (branch !== '_listeners' && tree.hasOwnProperty(branch)) {
listeners = listeners.concat(searchListenerTree(handlers, type, tree[branch], i+1));
}
}
return listeners;
} else if(currentType === '**') {
endReached = (i+1 === typeLength || (i+2 === typeLength && nextType === '*'));
if(endReached && tree._listeners) {
// The next element has a _listeners, add it to the handlers.
listeners = listeners.concat(searchListenerTree(handlers, type, tree, typeLength));
}
for (branch in tree) {
if (branch !== '_listeners' && tree.hasOwnProperty(branch)) {
if(branch === '*' || branch === '**') {
if(tree[branch]._listeners && !endReached) {
listeners = listeners.concat(searchListenerTree(handlers, type, tree[branch], typeLength));
}
listeners = listeners.concat(searchListenerTree(handlers, type, tree[branch], i));
} else if(branch === nextType) {
listeners = listeners.concat(searchListenerTree(handlers, type, tree[branch], i+2));
} else {
// No match on this one, shift into the tree but not in the type array.
listeners = listeners.concat(searchListenerTree(handlers, type, tree[branch], i));
}
}
}
return listeners;
}
listeners = listeners.concat(searchListenerTree(handlers, type, tree[currentType], i+1));
}
xTree = tree['*'];
if (xTree) {
//
// If the listener tree will allow any match for this part,
// then recursively explore all branches of the tree
//
searchListenerTree(handlers, type, xTree, i+1);
}
xxTree = tree['**'];
if(xxTree) {
if(i < typeLength) {
if(xxTree._listeners) {
// If we have a listener on a '**', it will catch all, so add its handler.
searchListenerTree(handlers, type, xxTree, typeLength);
}
// Build arrays of matching next branches and others.
for(branch in xxTree) {
if(branch !== '_listeners' && xxTree.hasOwnProperty(branch)) {
if(branch === nextType) {
// We know the next element will match, so jump twice.
searchListenerTree(handlers, type, xxTree[branch], i+2);
} else if(branch === currentType) {
// Current node matches, move into the tree.
searchListenerTree(handlers, type, xxTree[branch], i+1);
} else {
isolatedBranch = {};
isolatedBranch[branch] = xxTree[branch];
searchListenerTree(handlers, type, { '**': isolatedBranch }, i+1);
}
}
}
} else if(xxTree._listeners) {
// We have reached the end and still on a '**'
searchListenerTree(handlers, type, xxTree, typeLength);
} else if(xxTree['*'] && xxTree['*']._listeners) {
searchListenerTree(handlers, type, xxTree['*'], typeLength);
}
}
return listeners;
}
function growListenerTree(type, listener) {
type = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
//
// Looks for two consecutive '**', if so, don't add the event at all.
//
for(var i = 0, len = type.length; i+1 < len; i++) {
if(type[i] === '**' && type[i+1] === '**') {
return;
}
}
var tree = this.listenerTree;
var name = type.shift();
while (name !== undefined) {
if (!tree[name]) {
tree[name] = {};
}
tree = tree[name];
if (type.length === 0) {
if (!tree._listeners) {
tree._listeners = listener;
}
else {
if (typeof tree._listeners === 'function') {
tree._listeners = [tree._listeners];
}
tree._listeners.push(listener);
if (
!tree._listeners.warned &&
this._maxListeners > 0 &&
tree._listeners.length > this._maxListeners
) {
tree._listeners.warned = true;
logPossibleMemoryLeak.call(this, tree._listeners.length, name);
}
}
return true;
}
name = type.shift();
}
return true;
}
// By default EventEmitters will print a warning if more than
// 10 listeners are added to it. This is a useful default which
// helps finding memory leaks.
//
// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.delimiter = '.';
EventEmitter.prototype.setMaxListeners = function(n) {
if (n !== undefined) {
this._maxListeners = n;
if (!this._conf) this._conf = {};
this._conf.maxListeners = n;
}
};
EventEmitter.prototype.event = '';
EventEmitter.prototype.once = function(event, fn) {
return this._once(event, fn, false);
};
EventEmitter.prototype.prependOnceListener = function(event, fn) {
return this._once(event, fn, true);
};
EventEmitter.prototype._once = function(event, fn, prepend) {
this._many(event, 1, fn, prepend);
return this;
};
EventEmitter.prototype.many = function(event, ttl, fn) {
return this._many(event, ttl, fn, false);
}
EventEmitter.prototype.prependMany = function(event, ttl, fn) {
return this._many(event, ttl, fn, true);
}
EventEmitter.prototype._many = function(event, ttl, fn, prepend) {
var self = this;
if (typeof fn !== 'function') {
throw new Error('many only accepts instances of Function');
}
function listener() {
if (--ttl === 0) {
self.off(event, listener);
}
return fn.apply(this, arguments);
}
listener._origin = fn;
this._on(event, listener, prepend);
return self;
};
EventEmitter.prototype.emit = function() {
this._events || init.call(this);
var type = arguments[0];
if (type === 'newListener' && !this._newListener) {
if (!this._events.newListener) {
return false;
}
}
var al = arguments.length;
var args,l,i,j;
var handler;
if (this._all && this._all.length) {
handler = this._all.slice();
if (al > 3) {
args = new Array(al);
for (j = 0; j < al; j++) args[j] = arguments[j];
}
for (i = 0, l = handler.length; i < l; i++) {
this.event = type;
switch (al) {
case 1:
handler[i].call(this, type);
break;
case 2:
handler[i].call(this, type, arguments[1]);
break;
case 3:
handler[i].call(this, type, arguments[1], arguments[2]);
break;
default:
handler[i].apply(this, args);
}
}
}
if (this.wildcard) {
handler = [];
var ns = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
searchListenerTree.call(this, handler, ns, this.listenerTree, 0);
} else {
handler = this._events[type];
if (typeof handler === 'function') {
this.event = type;
switch (al) {
case 1:
handler.call(this);
break;
case 2:
handler.call(this, arguments[1]);
break;
case 3:
handler.call(this, arguments[1], arguments[2]);
break;
default:
args = new Array(al - 1);
for (j = 1; j < al; j++) args[j - 1] = arguments[j];
handler.apply(this, args);
}
return true;
} else if (handler) {
// need to make copy of handlers because list can change in the middle
// of emit call
handler = handler.slice();
}
}
if (handler && handler.length) {
if (al > 3) {
args = new Array(al - 1);
for (j = 1; j < al; j++) args[j - 1] = arguments[j];
}
for (i = 0, l = handler.length; i < l; i++) {
this.event = type;
switch (al) {
case 1:
handler[i].call(this);
break;
case 2:
handler[i].call(this, arguments[1]);
break;
case 3:
handler[i].call(this, arguments[1], arguments[2]);
break;
default:
handler[i].apply(this, args);
}
}
return true;
} else if (!this._all && type === 'error') {
if (arguments[1] instanceof Error) {
throw arguments[1]; // Unhandled 'error' event
} else {
throw new Error("Uncaught, unspecified 'error' event.");
}
return false;
}
return !!this._all;
};
EventEmitter.prototype.emitAsync = function() {
this._events || init.call(this);
var type = arguments[0];
if (type === 'newListener' && !this._newListener) {
if (!this._events.newListener) { return Promise.resolve([false]); }
}
var promises= [];
var al = arguments.length;
var args,l,i,j;
var handler;
if (this._all) {
if (al > 3) {
args = new Array(al);
for (j = 1; j < al; j++) args[j] = arguments[j];
}
for (i = 0, l = this._all.length; i < l; i++) {
this.event = type;
switch (al) {
case 1:
promises.push(this._all[i].call(this, type));
break;
case 2:
promises.push(this._all[i].call(this, type, arguments[1]));
break;
case 3:
promises.push(this._all[i].call(this, type, arguments[1], arguments[2]));
break;
default:
promises.push(this._all[i].apply(this, args));
}
}
}
if (this.wildcard) {
handler = [];
var ns = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
searchListenerTree.call(this, handler, ns, this.listenerTree, 0);
} else {
handler = this._events[type];
}
if (typeof handler === 'function') {
this.event = type;
switch (al) {
case 1:
promises.push(handler.call(this));
break;
case 2:
promises.push(handler.call(this, arguments[1]));
break;
case 3:
promises.push(handler.call(this, arguments[1], arguments[2]));
break;
default:
args = new Array(al - 1);
for (j = 1; j < al; j++) args[j - 1] = arguments[j];
promises.push(handler.apply(this, args));
}
} else if (handler && handler.length) {
handler = handler.slice();
if (al > 3) {
args = new Array(al - 1);
for (j = 1; j < al; j++) args[j - 1] = arguments[j];
}
for (i = 0, l = handler.length; i < l; i++) {
this.event = type;
switch (al) {
case 1:
promises.push(handler[i].call(this));
break;
case 2:
promises.push(handler[i].call(this, arguments[1]));
break;
case 3:
promises.push(handler[i].call(this, arguments[1], arguments[2]));
break;
default:
promises.push(handler[i].apply(this, args));
}
}
} else if (!this._all && type === 'error') {
if (arguments[1] instanceof Error) {
return Promise.reject(arguments[1]); // Unhandled 'error' event
} else {
return Promise.reject("Uncaught, unspecified 'error' event.");
}
}
return Promise.all(promises);
};
EventEmitter.prototype.on = function(type, listener) {
return this._on(type, listener, false);
};
EventEmitter.prototype.prependListener = function(type, listener) {
return this._on(type, listener, true);
};
EventEmitter.prototype.onAny = function(fn) {
return this._onAny(fn, false);
};
EventEmitter.prototype.prependAny = function(fn) {
return this._onAny(fn, true);
};
EventEmitter.prototype.addListener = EventEmitter.prototype.on;
EventEmitter.prototype._onAny = function(fn, prepend){
if (typeof fn !== 'function') {
throw new Error('onAny only accepts instances of Function');
}
if (!this._all) {
this._all = [];
}
// Add the function to the event listener collection.
if(prepend){
this._all.unshift(fn);
}else{
this._all.push(fn);
}
return this;
}
EventEmitter.prototype._on = function(type, listener, prepend) {
if (typeof type === 'function') {
this._onAny(type, listener);
return this;
}
if (typeof listener !== 'function') {
throw new Error('on only accepts instances of Function');
}
this._events || init.call(this);
// To avoid recursion in the case that type == "newListeners"! Before
// adding it to the listeners, first emit "newListeners".
if (this._newListener)
this.emit('newListener', type, listener);
if (this.wildcard) {
growListenerTree.call(this, type, listener);
return this;
}
if (!this._events[type]) {
// Optimize the case of one listener. Don't need the extra array object.
this._events[type] = listener;
}
else {
if (typeof this._events[type] === 'function') {
// Change to array.
this._events[type] = [this._events[type]];
}
// If we've already got an array, just add
if(prepend){
this._events[type].unshift(listener);
}else{
this._events[type].push(listener);
}
// Check for listener leak
if (
!this._events[type].warned &&
this._maxListeners > 0 &&
this._events[type].length > this._maxListeners
) {
this._events[type].warned = true;
logPossibleMemoryLeak.call(this, this._events[type].length, type);
}
}
return this;
}
EventEmitter.prototype.off = function(type, listener) {
if (typeof listener !== 'function') {
throw new Error('removeListener only takes instances of Function');
}
var handlers,leafs=[];
if(this.wildcard) {
var ns = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
leafs = searchListenerTree.call(this, null, ns, this.listenerTree, 0);
}
else {
// does not use listeners(), so no side effect of creating _events[type]
if (!this._events[type]) return this;
handlers = this._events[type];
leafs.push({_listeners:handlers});
}
for (var iLeaf=0; iLeaf<leafs.length; iLeaf++) {
var leaf = leafs[iLeaf];
handlers = leaf._listeners;
if (isArray(handlers)) {
var position = -1;
for (var i = 0, length = handlers.length; i < length; i++) {
if (handlers[i] === listener ||
(handlers[i].listener && handlers[i].listener === listener) ||
(handlers[i]._origin && handlers[i]._origin === listener)) {
position = i;
break;
}
}
if (position < 0) {
continue;
}
if(this.wildcard) {
leaf._listeners.splice(position, 1);
}
else {
this._events[type].splice(position, 1);
}
if (handlers.length === 0) {
if(this.wildcard) {
delete leaf._listeners;
}
else {
delete this._events[type];
}
}
if (this._removeListener)
this.emit("removeListener", type, listener);
return this;
}
else if (handlers === listener ||
(handlers.listener && handlers.listener === listener) ||
(handlers._origin && handlers._origin === listener)) {
if(this.wildcard) {
delete leaf._listeners;
}
else {
delete this._events[type];
}
if (this._removeListener)
this.emit("removeListener", type, listener);
}
}
function recursivelyGarbageCollect(root) {
if (root === undefined) {
return;
}
var keys = Object.keys(root);
for (var i in keys) {
var key = keys[i];
var obj = root[key];
if ((obj instanceof Function) || (typeof obj !== "object") || (obj === null))
continue;
if (Object.keys(obj).length > 0) {
recursivelyGarbageCollect(root[key]);
}
if (Object.keys(obj).length === 0) {
delete root[key];
}
}
}
recursivelyGarbageCollect(this.listenerTree);
return this;
};
EventEmitter.prototype.offAny = function(fn) {
var i = 0, l = 0, fns;
if (fn && this._all && this._all.length > 0) {
fns = this._all;
for(i = 0, l = fns.length; i < l; i++) {
if(fn === fns[i]) {
fns.splice(i, 1);
if (this._removeListener)
this.emit("removeListenerAny", fn);
return this;
}
}
} else {
fns = this._all;
if (this._removeListener) {
for(i = 0, l = fns.length; i < l; i++)
this.emit("removeListenerAny", fns[i]);
}
this._all = [];
}
return this;
};
EventEmitter.prototype.removeListener = EventEmitter.prototype.off;
EventEmitter.prototype.removeAllListeners = function(type) {
if (type === undefined) {
!this._events || init.call(this);
return this;
}
if (this.wildcard) {
var ns = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
var leafs = searchListenerTree.call(this, null, ns, this.listenerTree, 0);
for (var iLeaf=0; iLeaf<leafs.length; iLeaf++) {
var leaf = leafs[iLeaf];
leaf._listeners = null;
}
}
else if (this._events) {
this._events[type] = null;
}
return this;
};
EventEmitter.prototype.listeners = function(type) {
if (this.wildcard) {
var handlers = [];
var ns = typeof type === 'string' ? type.split(this.delimiter) : type.slice();
searchListenerTree.call(this, handlers, ns, this.listenerTree, 0);
return handlers;
}
this._events || init.call(this);
if (!this._events[type]) this._events[type] = [];
if (!isArray(this._events[type])) {
this._events[type] = [this._events[type]];
}
return this._events[type];
};
EventEmitter.prototype.eventNames = function(){
return Object.keys(this._events);
}
EventEmitter.prototype.listenerCount = function(type) {
return this.listeners(type).length;
};
EventEmitter.prototype.listenersAny = function() {
if(this._all) {
return this._all;
}
else {
return [];
}
};
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(function() {
return EventEmitter;
});
} else if (typeof exports === 'object') {
// CommonJS
module.exports = EventEmitter;
}
else {
// Browser global.
window.EventEmitter2 = EventEmitter;
}
}();
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