Better Luogu Problem Searcher

洛谷题目跳转器优化
当前为 2019-07-09 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Better Luogu Problem Searcher
// @namespace    n/a
// @version      0.0.2
// @description  洛谷题目跳转器优化
// @author       iotang
// @match        https://www.luogu.org
// @match        https://www.luogu.org/
// @match        https://www.luogu.org/#feed
// @match        https://www.luogu.org/#feed/
// @match        http://www.luogu.org
// @match        http://www.luogu.org/
// @match        http://www.luogu.org/#feed
// @match        http://www.luogu.org/#feed/
// @grant        none
// ==/UserScript==

(function()
{
    'use strict';

    var hrefOld = "https://www.luogu.org/problemnew";
    var hrefNew = "https://www.luogu.org/fe/problem";

    function jumpfn()
    {
        var target = document.getElementsByClassName("am-form-field")[0].value;
        if(target === "")return;

        var checked = document.getElementById("switch_to_fe").checked;

        var go;
        if(checked === true)go = hrefNew + "/list?keyword=" + target + "&content=true";
        else go = hrefOld + "/lists?name=" + target + "&orderitem=pid&tag=&content=1&type=";

        location.href = go;
    }

    function searchfn()
    {
        var target = document.getElementsByClassName("am-form-field")[0].value;
        if(target === "")return;

        var targetu = target.toUpperCase();
        var checked = document.getElementById("switch_to_fe").checked;
        var go = "";

        if(checked === true)go = hrefNew;
        else go = hrefOld + "/show";

        if(target.match(/^[1-9][0-9][0-9][0-9]+$/) == target)go = go + "/P" + target;
        else if(targetu.match(/^[0-9]+[A-Z][0-9]?$/) == targetu)go = go + "/CF" + targetu;
        else if(targetu.match(/^(?:U|P|CF|SP|AT|UVA)[0-9]+[A-Z]?[0-9]?$/) == targetu)go = go + "/" + targetu;
        else
        {
            if(checked === true)go = hrefNew + "/list?keyword=" + target + "&content=true";
            else go = hrefOld + "/lists?name=" + target + "&orderitem=pid&tag=&content=1&type=";
        }

        location.href = go;
    }

    var locations =
        document.getElementsByClassName("lg-index-content")[0]
    .getElementsByClassName("lg-article lg-index-stat")[0]
    .getElementsByClassName("am-btn am-btn-primary am-btn-sm")[0]
    .parentNode;

    var button = document.createElement("button");
    button.className = "am-btn am-btn-success am-btn-sm";
    button.name = "gotosearch";
    button.id = "gotosearch";
    button.innerHTML = "搜索";
    button.onclick = function(){jumpfn();};

    var checkbox = document.createElement("input");
    checkbox.type = "checkbox";
    checkbox.class = "switch_to_fe";
    checkbox.id = "switch_to_fe";
    checkbox.defaultChecked = "true";

    locations.appendChild(button);
    locations.appendChild(checkbox);

    document.getElementsByClassName("am-form-field")[0].placeholder = "输入题号或题目名，按回车确认";
    document.getElementsByClassName("am-form-field")[0].onkeyup = function(event){if(event.keyCode === 13){searchfn();}};

    document.getElementsByClassName("lg-article lg-index-stat")[0].getElementsByTagName("h2")[0].innerHTML = "问题搜索";

    document.getElementsByName("gotorandom")[0].innerHTML = "随机";
})();