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/* Polyfill indexOf. */
var indexOf;
if (typeof Array.prototype.indexOf === 'function') {
indexOf = function (haystack, needle) {
return haystack.indexOf(needle);
};
} else {
indexOf = function (haystack, needle) {
var i = 0, length = haystack.length, idx = -1, found = false;
while (i < length && !found) {
if (haystack[i] === needle) {
idx = i;
found = true;
}
i++;
}
return idx;
};
};
/* Polyfill EventEmitter. */
/**
* Creates an event emitter.
* @param {string[]} autoFireAfterEmit Auto-fire event names
*/
var EventEmitter = function (autoFireAfterEmit = []) {
this.events = {};
this.autoFireLastArgs = new Map();
this.autoFireAfterEmit = new Set(autoFireAfterEmit);
};
/**
* Adds a listener to an event.
* @param {string} event Event name
* @param {function} listener Event listener
* @returns
*/
EventEmitter.prototype.on = function (event, listener) {
// Unknown event used by external libraries?
if (event === undefined) {
console.trace('EventEmitter: Cannot listen to undefined event');
return;
}
if (typeof this.events[event] !== 'object') {
this.events[event] = [];
}
this.events[event].push(listener);
if (this.autoFireAfterEmit.has(event) && this.autoFireLastArgs.has(event)) {
listener.apply(this, this.autoFireLastArgs.get(event));
}
};
/**
* Makes the listener the last to be called when the event is emitted
* @param {string} event Event name
* @param {function} listener Event listener
*/
EventEmitter.prototype.makeLast = function (event, listener) {
if (typeof this.events[event] !== 'object') {
this.events[event] = [];
}
const events = this.events[event];
const idx = events.indexOf(listener);
if (idx > -1) {
events.splice(idx, 1);
}
events.push(listener);
if (this.autoFireAfterEmit.has(event) && this.autoFireLastArgs.has(event)) {
listener.apply(this, this.autoFireLastArgs.get(event));
}
}
/**
* Makes the listener the first to be called when the event is emitted
* @param {string} event Event name
* @param {function} listener Event listener
*/
EventEmitter.prototype.makeFirst = function (event, listener) {
if (typeof this.events[event] !== 'object') {
this.events[event] = [];
}
const events = this.events[event];
const idx = events.indexOf(listener);
if (idx > -1) {
events.splice(idx, 1);
}
events.unshift(listener);
if (this.autoFireAfterEmit.has(event) && this.autoFireLastArgs.has(event)) {
listener.apply(this, this.autoFireLastArgs.get(event));
}
}
/**
* Removes a listener from an event.
* @param {string} event Event name
* @param {function} listener Event listener
*/
EventEmitter.prototype.removeListener = function (event, listener) {
var idx;
if (typeof this.events[event] === 'object') {
idx = indexOf(this.events[event], listener);
if (idx > -1) {
this.events[event].splice(idx, 1);
}
}
};
/**
* Emits an event with optional arguments.
* @param {string} event Event name
*/
EventEmitter.prototype.emit = async function (event) {
let args = [].slice.call(arguments, 1);
if (localStorage.getItem('eventTracing') === 'true') {
console.trace('Event emitted: ' + event, args);
} else {
console.debug('Event emitted: ' + event);
}
let i, listeners, length;
if (typeof this.events[event] === 'object') {
listeners = this.events[event].slice();
length = listeners.length;
for (i = 0; i < length; i++) {
try {
await listeners[i].apply(this, args);
}
catch (err) {
console.error(err);
console.trace('Error in event listener');
}
}
}
if (this.autoFireAfterEmit.has(event)) {
this.autoFireLastArgs.set(event, args);
}
};
EventEmitter.prototype.emitAndWait = function (event) {
let args = [].slice.call(arguments, 1);
if (localStorage.getItem('eventTracing') === 'true') {
console.trace('Event emitted: ' + event, args);
} else {
console.debug('Event emitted: ' + event);
}
let i, listeners, length;
if (typeof this.events[event] === 'object') {
listeners = this.events[event].slice();
length = listeners.length;
for (i = 0; i < length; i++) {
try {
listeners[i].apply(this, args);
}
catch (err) {
console.error(err);
console.trace('Error in event listener');
}
}
}
if (this.autoFireAfterEmit.has(event)) {
this.autoFireLastArgs.set(event, args);
}
};
EventEmitter.prototype.once = function (event, listener) {
this.on(event, function g() {
this.removeListener(event, g);
listener.apply(this, arguments);
});
};
export { EventEmitter }
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