Chat Calculator

Press Tab To Do Math
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// ==UserScript==
// @name         Chat Calculator
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Press Tab To Do Math
// @author       AlphB
// @match        https://www.milkywayidle.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=milkywayidle.com
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/bundle.min.js
// @license      CC0
// ==/UserScript==

(function () {
    document.addEventListener('keydown', function (event) {
        if (event.key === 'Tab' && document.activeElement.classList.contains('Chat_chatInput__16dhX')) {
            event.preventDefault();
            const inputNode = document.activeElement;
            const parser = new exprEval.Parser();
            const originalValue = inputNode.value.trim();
            let result;
            if (originalValue.endsWith("=")) {
                try {
                    result = originalValue + String(parser.evaluate(originalValue.substring(0, originalValue.length - 1)));
                } catch (e) {
                    return;
                }
            } else {
                try {
                    result = parser.evaluate(originalValue);
                } catch (e) {
                    return;
                }
            }
            const tracker = inputNode._valueTracker;
            const previousValue = tracker ? tracker.getValue() : originalValue;
            inputNode.value = result;
            if (tracker) {
                tracker.setValue(previousValue);
                inputNode.dispatchEvent(new Event("input", {bubbles: true}));
            }
        }
    });
})();