Uses a Web Worker to ensure high-precision timing for setInterval and setTimeout.
As of
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/552983/1679684/HackTimer%20V1.js
// ==UserScript==
// @license MIT
// @name HackTimer V1
// @namespace HackTimer
// @version 1.0.1.1
// @description Uses a Web Worker to ensure high-precision timing for setInterval and setTimeout.
// @grant none
// ==/UserScript==
(function (workerScript) {
if (!/MSIE 10/i.test (navigator.userAgent)) {
try {
var blob = new Blob([`
var fakeIdToId = {};\
onmessage = function (event) {\
var data = event.data,\
name = data.name,\
fakeId = data.fakeId,\
time;\
if(data.hasOwnProperty('time')) {\
time = data.time;\
}\
switch (name) {\
case 'setInterval':\
fakeIdToId[fakeId] = setInterval(function () {\
postMessage({fakeId: fakeId});\
}, time);\
break;\
case 'clearInterval':\
if (fakeIdToId.hasOwnProperty (fakeId)) {\
clearInterval(fakeIdToId[fakeId]);\
delete fakeIdToId[fakeId];\
}\
break;\
case 'setTimeout':\
fakeIdToId[fakeId] = setTimeout(function () {\
postMessage({fakeId: fakeId});\
if (fakeIdToId.hasOwnProperty (fakeId)) {\
delete fakeIdToId[fakeId];\
}\
}, time);\
break;\
case 'clearTimeout':\
if (fakeIdToId.hasOwnProperty (fakeId)) {\
clearTimeout(fakeIdToId[fakeId]);\
delete fakeIdToId[fakeId];\
}\
break;\
}\
}\
"`]);
// Obtain a blob URL reference to our worker 'file'.
workerScript = window.URL.createObjectURL(blob);
} catch (error) {
/* Blob is not supported, use external script instead */
}
}
var worker,
fakeIdToCallback = {},
lastFakeId = 0,
maxFakeId = 0x7FFFFFFF, // 2 ^ 31 - 1, 31 bit, positive values of signed 32 bit integer
logPrefix = 'HackTimer.js by turuslan: ';
if (typeof (Worker) !== 'undefined') {
function getFakeId () {
do {
if (lastFakeId == maxFakeId) {
lastFakeId = 0;
} else {
lastFakeId ++;
}
} while (fakeIdToCallback.hasOwnProperty (lastFakeId));
return lastFakeId;
}
try {
worker = new Worker (workerScript);
window.setInterval = function (callback, time /* , parameters */) {
var fakeId = getFakeId ();
fakeIdToCallback[fakeId] = {
callback: callback,
parameters: Array.prototype.slice.call(arguments, 2)
};
worker.postMessage ({
name: 'setInterval',
fakeId: fakeId,
time: time
});
return fakeId;
};
window.clearInterval = function (fakeId) {
if (fakeIdToCallback.hasOwnProperty(fakeId)) {
delete fakeIdToCallback[fakeId];
worker.postMessage ({
name: 'clearInterval',
fakeId: fakeId
});
}
};
window.setTimeout = function (callback, time /* , parameters */) {
var fakeId = getFakeId ();
fakeIdToCallback[fakeId] = {
callback: callback,
parameters: Array.prototype.slice.call(arguments, 2),
isTimeout: true
};
worker.postMessage ({
name: 'setTimeout',
fakeId: fakeId,
time: time
});
return fakeId;
};
window.clearTimeout = function (fakeId) {
if (fakeIdToCallback.hasOwnProperty(fakeId)) {
delete fakeIdToCallback[fakeId];
worker.postMessage ({
name: 'clearTimeout',
fakeId: fakeId
});
}
};
worker.onmessage = function (event) {
var data = event.data,
fakeId = data.fakeId,
request,
parameters,
callback;
if (fakeIdToCallback.hasOwnProperty(fakeId)) {
request = fakeIdToCallback[fakeId];
callback = request.callback;
parameters = request.parameters;
if (request.hasOwnProperty ('isTimeout') && request.isTimeout) {
delete fakeIdToCallback[fakeId];
}
}
if (typeof (callback) === 'string') {
try {
callback = new Function (callback);
} catch (error) {
console.log (logPrefix + 'Error parsing callback code string: ', error);
}
}
if (typeof (callback) === 'function') {
callback.apply (window, parameters);
}
};
worker.onerror = function (event) {
console.log (event);
};
} catch (error) {
console.log (logPrefix + 'Initialisation failed');
console.error (error);
}
} else {
console.log (logPrefix + 'Initialisation failed - HTML5 Web Worker is not supported');
}
}) ('HackTimerWorker.js');