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Auto Select CF Language

Auto selects the language based on file extension, when you upload a file

// ==UserScript==
// @name         Auto Select CF Language
// @namespace    http://tampermonkey.net/
// @version      0.2.0
// @description  Auto selects the language based on file extension, when you upload a file
// @author       Mushfiqur Rahman Talha
// @match        *codeforces.com/contest/*/problem/*
// @match        *codeforces.com/problemset/problem/*
// @match        *mirror.codeforces.com/contest/*/problem/*
// @match        *mirror.codeforces.com/problemset/problem/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=codeforces.com
// @grant        none
// @license      Apache-2.0
// ==/UserScript==

(function() {
    'use strict';

    /*
    Language Support:
     - GNU GCC C11 5.1.0
     - GNU G++23 14.2 (64 bit, msys2)
     - C# 10, .NET SDK 6.0
     - D DMD32 v2.105.0
     - Go 1.22.2
     - Java 21 64bit
     - Kotlin 1.9.21
     - OCaml 4.02.1
     - PHP 8.1.7
     - PyPy 3.10 (7.3.15, 64bit)
     - Ruby 3.2.2
     - Rust 1.75.0 (2021)
     - Node.js 15.8.0 (64bit)
    */
    const fileInput = document.querySelector("input[name=sourceFile]");
    fileInput.addEventListener("change", event => {
        const file = event.target.files[0];
        if (!file) return;
        const ext = file.name.split('.').pop();
        let optionValue = null;
        switch (ext) {
            case "cpp":
                optionValue = "91";
                break;
            case "c":
                optionValue = "43";
                break;
            case "java":
                optionValue = "87";
                break;
            case "py":
                optionValue = "70";
                break;
            case "cs":
                optionValue = "79";
                break;
            case "js":
                optionValue = "55";
                break;
            case "d":
                optionValue = "28";
                break;
            case "go":
                optionValue = "32";
                break;
            case "kt":
                optionValue = "88";
                break;
            case "ml":
                optionValue = "19";
                break;
            case "php":
                optionValue = "6";
                break;
            case "rb":
                optionValue = "67";
                break;
            case "rs":
                optionValue = "75";
                break;

            default:
                break;
        }

        if (!optionValue) return;
        document.querySelectorAll("option").forEach(element => element.removeAttribute("selected"));
        document.querySelector(`option[value='${optionValue}']`).setAttribute("selected", "selected");
    });
})();