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Web Search Result Domain Filter

Filter search result based on domain names on web search of Bing, DuckDuckGo, Google, Yahoo. Some include search for news, books, etc. All exclude search for images and videos.
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// ==UserScript==
// @name        Web Search Result Domain Filter
// @namespace   WebSearchResultDomainFilter
// @version     1.0.7
// @license     GNU AGPLv3
// @author      jcunews
// @description Filter search result based on domain names on web search of Bing, DuckDuckGo, Google, Yahoo. Some include search for news, books, etc. All exclude search for images and videos.
// @homepageURL https://greasyfork.org/en/users/85671-jcunews
// @include     *://www.bing.com/search*
// @include     *://www.bing.com/news/search*
// @include     *://duckduckgo.com/*
// @include     *://www.google.*/search*
// @include     *://www.google.*.*/search*
// @include     *://search.yahoo.com/search*
// @include     *://search.yahoo.com/yhs/search*
// @include     *://*.search.yahoo.com/search*
// @grant       none
// ==/UserScript==

(function(filter, rx, getItems, getHostName, itemSelector, itemLinkSelector, setupEditFilterLink, cssPatch, items, ele, i, j, excLink, link, createFilterLink, filterEditor, gg) {
  filter = JSON.parse(localStorage.WebSearchResultDomainFilter || "[]");
  rx = filter.join("|").replace(/\./g, "\\.") ? (new RegExp(filter.join("|").replace(/\./g, "\\."))) : null;
  cssPatch = "";
  excLink = document.createElement("DIV");
  filterEditor = document.createElement("DIV");
  gg = location.hostname.indexOf(".google.") > 0;

  function trim(s) {
    return s.replace(/^(\s+|\r+|\n+)|(\s+|\r+|\n+)$/g, "");
  }
  function updateFilter() {
    localStorage.WebSearchResultDomainFilter = JSON.stringify(filter);
    rx = filter.join("|").replace(/\./g, "\\.");
    rx = rx ? (new RegExp(filter.join("|").replace(/\./g, "\\."))) : null;
  }
  function abortEvent(ev) {
    ev.preventDefault();
    if (ev.stopPropagation) ev.stopPropagation();
    if (ev.stopImmediatePropagation) ev.stopImmediatePropagation();
  }
  function processItems(items, i, link, lnk, hn) {
    if (getItems) {
      items = getItems();
    } else items = document.querySelectorAll(itemSelector);
    for (i = items.length-1; i >= 0; i--) {
      link = items[i].querySelector(itemLinkSelector);
      if (!link) continue;
      if (!link.parentNode.querySelector(".domainFilterLink")) {
        lnk = excLink.cloneNode(true);
        lnk.addEventListener("click", function(ev) {
          hn = getHostName(this.parentNode.querySelector("A"));
          if (!confirm('Do you want to hide all search result from below domain name?\n\n' + hn + '\n\nNote:\nSubdomain is not included.\ni.e. hiding "abc.com" will not hide "sub.abc.com" or vice versa.')) return;
          filter.push(hn);
          updateFilter();
          processItems();
          abortEvent(ev);
        }, true);
        link.parentNode.appendChild(lnk);
        if (gg && ((lnk.offsetLeft + lnk.offsetWidth) >= link.parentNode.offsetWidth)) {
          lnk.style.cssText = "position:absolute;top:" + (((link.parentNode.offsetHeight - lnk.offsetHeight) / 2) >> 0) + "px;right:-" + lnk.offsetWidth + "px;margin-left:0";
          link.parentNode.parentNode.insertBefore(lnk, link.parentNode);
        }
      }
      if (rx) {
        items[i].style.display = rx.test(getHostName(link)) ? "none" : "";
      } else items[i].style.display = "";
    }
  }

  if ((/www\.bing\.com\/search/).test(location.href)) {
    itemSelector = "#b_results .b_algo";
    itemLinkSelector = "h2 > a";
    createFilterLink = function() {
      editFilterLink = document.createElement("A");
      editFilterLink.style.marginLeft = "3ex";
      return (window.b_tween || document.querySelector(".b_scopebar ul")).appendChild(editFilterLink);
    };
    cssPatch = '#b_results{width:580px}';
  } else
  if ((/www\.bing\.com\/news\/search/).test(location.href)) {
    itemSelector = "#algocore .newsitem";
    itemLinkSelector = ".title";
    createFilterLink = function(ele) {
      editFilterLink = document.createElement("A");
      editFilterLink.style.cssText = 'float:left;margin:.85em 0 0 3ex';
      return document.querySelector(".nf .menu > ul").appendChild(editFilterLink);
    };
    cssPatch = '.search .newsitem .caption a.title{display:inline!important}';
  } else
  if ((/duckduckgo\.com/).test(location.hostname)) {
    itemSelector = "#links .result";
    itemLinkSelector = ".result__title > a";
    createFilterLink = function(ele) {
      ele = document.querySelector(".search-filters");
      if (!ele || !ele.childElementCount) return;
      editFilterLink = document.createElement("A");
      return ele.appendChild(editFilterLink);
    };
    cssPatch = '#b_results{width:580px}';
    if (window.nrn) {
      window._nrn = window.nrn;
      window.nrn = function(res) {
        res = window._nrn.apply(this, arguments);
        processItems();
        return res;
      };
    }
  } else
  if ((/www\.google\./).test(location.hostname)) {
    itemSelector = "#rso .g";
    itemLinkSelector = "a";
    createFilterLink = function() {
      editFilterLink = document.createElement("A");
      editFilterLink.style.marginLeft = "10ex";
      return window["result-stats"] ? window["result-stats"].appendChild(editFilterLink) : null;
    };
  } else
  if ((/search\.yahoo\.com/).test(location.hostname)) {
    itemLinkSelector = ".title > a, h4 > a";
    getItems = function() {
      return Array.prototype.slice.call(document.querySelectorAll(".searchCenterMiddle > li, .compArticleList > li")).filter(
        function(v) {
          return !(/\bsys_/).test(v.firstElementChild.className);
        }
      );
    };
    createFilterLink = function(ele) {
      editFilterLink = document.createElement("A");
      if (window["refiner-time"]) {
        editFilterLink.style.cssText = 'margin-left:6ex';
        return window["refiner-time"].appendChild(editFilterLink);
      } else {
        ele = document.querySelector("#sidebar .bd,#horizontal-bar .searchLeftTop");
        if (ele.tagName === "OL") {
          ele = ele.appendChild(document.createElement("LI"));
          ele.style.cssText = "1em 0.9em 0.8em 0.9em";
        }
        return ele.appendChild(editFilterLink);
      }
    };
    cssPatch = '.search .newsitem .caption a.title{display:inline!important}';
    getHostName = function(link, a) {
      a = unescape(link.href).match(/\/RU=(http.*?)\/R[A-Z]=/);
      if (a) {
        a = a[1].match(/\/\/(.*?)\//)[1];
      } else a = link.hostname;
      return a;
    };
  }
  if (!(getItems || itemSelector)) return;
  if (!getHostName) {
    getHostName = function(link) {
      return link.hostname;
    };
  }

  filterEditor.id = "filterEditor";
  filterEditor.innerHTML = `
<style>${cssPatch}
.domainFilterLink{display:inline-block;margin-left:1ex;border-radius:4px;padding:0 .5ex;background-color:#d00;color:#fff;font-size:10pt;font-weight:bold;cursor:pointer}
#domainFilterEditLink{cursor:pointer}
#domainFilterEditor{display:none;position:fixed;z-index:999;left:33%;top:20%;right:33%;border-radius:5px;padding:15px;background-color:#ccc}
#domainFilterEditor textarea{margin-bottom:15px;width:100%;min-width:100%;max-width:100%;height:20em;min-height:5em;max-height:30em;box-sizing:border-box}
#domainFilterEditor div{padding:.3em 1ex;background-color:#000;color:#fff;font-weight:bold}
#domainFilterEditor table{width:100%;text-align:center}
#domainFilterEditor button{width:10ex}
</style>
<div id="domainFilterEditor">
  <style></style>
  <div>Edit Domain Filter</div>
  <textarea id="domainFilterEditorEdit"></textarea>
  <table><tr>
    <td><button id="domainFilterEditorOk">OK</button></td>
    <td><button id="domainFilterEditorCancel">Cancel</button></td>
  </tr></table>
</div>`;
  document.body.appendChild(filterEditor);
  domainFilterEditorOk.addEventListener("click", function(ev, txt) {
    txt = trim(domainFilterEditorEdit.value);
    filter = txt.split("\n").reduce(function(prev, cur) {
      cur = trim(cur);
      if (cur) prev.push(cur);
      return prev;
    }, []);
    updateFilter();
    processItems();
    domainFilterEditor.firstElementChild.innerHTML = "";
    abortEvent(ev);
  }, true);
  domainFilterEditorCancel.addEventListener("click", function(ev) {
    domainFilterEditor.firstElementChild.innerHTML = "";
    abortEvent(ev);
  }, true);

  excLink.textContent = "X";
  excLink.title = "Exclude this domain name from search result";
  excLink.className = "domainFilterLink";

  (function addEditFilterLink() {
    if (editFilterLink = createFilterLink()) {
      editFilterLink.textContent = "Edit Domain Filter";
      editFilterLink.title = "Edit search result domain filter";
      editFilterLink.id = "domainFilterEditLink";
      editFilterLink.addEventListener("click", function(ev, txt) {
        txt = filter.join("\n");
        domainFilterEditorEdit.value = txt + (txt ? "\n" : "");
        domainFilterEditor.firstElementChild.innerHTML = `
body>*{display:none!important}
#filterEditor{display:block!important}
#domainFilterEditor{display:block}`;
        abortEvent(ev);
      }, true);
      processItems();
    } else setTimeout(addEditFilterLink, 1000);
  })();

})();
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