Reshuege autosolver - Automatically solves tests from reshguege

reshuege_autosolver.user.js

// ==UserScript==
// @name         Reshuege autosolver
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Automatically solve tests from reshguege
// @author       Nuark
// @match        *://*.sdamgia.ru/test*
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    window.zxc = function(e, do_alert=true) {
        let href = e.parentNode.querySelector(".prob_nums > a").href;
        fetch(href).then(r => r.text()).then(text => {
            let holder = document.createElement("div");
            holder.innerHTML = text;
            [...holder.querySelectorAll("script"), ...holder.querySelectorAll("link")].forEach(scr => scr.remove())
            let solution = holder.querySelector(".solution");
            let matches = solution.innerText.match(/Ответ: (.+)/gmi);
            if (matches !== null) {
                e.value = matches[0].replace(/Ответ: (.+)/mi, "$1");
                if (e.value.endsWith(".")) {
                    e.value = e.value.slice(0, e.value.length-1);
                }
                if (e.value.indexOf("|") !== -1) {
                    e.value = e.value.split("|").pop();
                }
            }
            else if (do_alert) {
                let winop = window.open(href, "_blank");
                winop.blur();
                window.focus();
            }
        });
    }

    window.solveAll = function() {
        document.querySelectorAll(".prob_list .test_inp").forEach(x => window.zxc(x, false));
    }

    let init = function() {
        document.querySelectorAll(".prob_list .test_inp").forEach(x => {
            x.ondblclick = function () {
                window.zxc(this);
            }
        });
        let input = document.createElement("input");
        input.type = "button";
        input.onclick = window.solveAll;
        input.value = "Решить всё";
        document.querySelector('div.content input[type="button"]').parentNode.append(input);
    }

    init();
})();