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