80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
/* 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. */
|
|
var EventEmitter = function () {
|
|
this.events = {};
|
|
};
|
|
|
|
EventEmitter.prototype.on = function (event, listener) {
|
|
if (typeof this.events[event] !== 'object') {
|
|
this.events[event] = [];
|
|
}
|
|
|
|
this.events[event].push(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);
|
|
}
|
|
}
|
|
};
|
|
|
|
EventEmitter.prototype.emit = async function (event) {
|
|
console.debug('Event emitted: ' + event);
|
|
|
|
var i, listeners, length, args = [].slice.call(arguments, 1);
|
|
|
|
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');
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
EventEmitter.prototype.once = function (event, listener) {
|
|
this.on(event, function g () {
|
|
this.removeListener(event, g);
|
|
listener.apply(this, arguments);
|
|
});
|
|
};
|
|
|
|
export { EventEmitter }
|