155 lines
3.8 KiB
JavaScript
155 lines
3.8 KiB
JavaScript
/* Polyfill indexOf. */
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var indexOf;
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if (typeof Array.prototype.indexOf === 'function') {
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indexOf = function (haystack, needle) {
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return haystack.indexOf(needle);
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};
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} else {
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indexOf = function (haystack, needle) {
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var i = 0, length = haystack.length, idx = -1, found = false;
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while (i < length && !found) {
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if (haystack[i] === needle) {
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idx = i;
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found = true;
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}
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i++;
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}
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return idx;
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};
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};
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/* Polyfill EventEmitter. */
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var EventEmitter = function () {
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this.events = {};
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};
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EventEmitter.prototype.on = function (event, listener) {
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// Unknown event used by external libraries?
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if (event === undefined) {
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console.trace('EventEmitter: Cannot listen to undefined event');
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return;
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}
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if (typeof this.events[event] !== 'object') {
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this.events[event] = [];
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}
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this.events[event].push(listener);
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};
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/**
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* Makes the listener the last to be called when the event is emitted
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* @param {string} event Event name
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* @param {function} listener Event listener
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*/
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EventEmitter.prototype.makeLast = function (event, listener) {
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if (typeof this.events[event] !== 'object') {
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this.events[event] = [];
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}
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const events = this.events[event];
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const idx = events.indexOf(listener);
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if (idx > -1) {
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events.splice(idx, 1);
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}
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events.push(listener);
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}
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/**
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* Makes the listener the first to be called when the event is emitted
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* @param {string} event Event name
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* @param {function} listener Event listener
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*/
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EventEmitter.prototype.makeFirst = function (event, listener) {
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if (typeof this.events[event] !== 'object') {
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this.events[event] = [];
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}
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const events = this.events[event];
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const idx = events.indexOf(listener);
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if (idx > -1) {
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events.splice(idx, 1);
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}
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events.unshift(listener);
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}
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EventEmitter.prototype.removeListener = function (event, listener) {
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var idx;
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if (typeof this.events[event] === 'object') {
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idx = indexOf(this.events[event], listener);
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if (idx > -1) {
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this.events[event].splice(idx, 1);
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}
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}
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};
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EventEmitter.prototype.emit = async function (event) {
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if (localStorage.getItem('eventTracing') === 'true') {
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console.trace('Event emitted: ' + event, args);
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} else {
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console.debug('Event emitted: ' + event);
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}
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var i, listeners, length, args = [].slice.call(arguments, 1);
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if (typeof this.events[event] === 'object') {
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listeners = this.events[event].slice();
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length = listeners.length;
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for (i = 0; i < length; i++) {
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try {
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await listeners[i].apply(this, args);
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}
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catch (err) {
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console.error(err);
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console.trace('Error in event listener');
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}
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}
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}
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};
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EventEmitter.prototype.emitAndWait = function (event) {
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if (localStorage.getItem('eventTracing') === 'true') {
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console.trace('Event emitted: ' + event, args);
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} else {
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console.debug('Event emitted: ' + event);
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}
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var i, listeners, length, args = [].slice.call(arguments, 1);
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if (typeof this.events[event] === 'object') {
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listeners = this.events[event].slice();
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length = listeners.length;
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for (i = 0; i < length; i++) {
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try {
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listeners[i].apply(this, args);
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}
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catch (err) {
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console.error(err);
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console.trace('Error in event listener');
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}
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}
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}
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};
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EventEmitter.prototype.once = function (event, listener) {
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this.on(event, function g () {
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this.removeListener(event, g);
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listener.apply(this, arguments);
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});
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};
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export { EventEmitter }
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