Amazon Tag Remove (All)

Elimina la variable tag de los vínculos hacia Amazon
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// ==UserScript==
// @name           Amazon Tag Remove (All)
// @namespace      Tag remove for links of Amazon
// @description    Elimina la variable tag de los vínculos hacia Amazon
// @include        *
// @author         WeSo
// @version        20160310
// @run-at         document-end

// ==/UserScript==


// Amazon sites
var sites = Array(
      "amazon.com",
      "amazon.es",
      "amazon.co.uk",
      "amazon.de",
      "amazon.it",
      "amazon.fr",
      "amazon.ca",
      "amazon.cn",
      "amazon.co.jp",
      "goo.gl"
    );

function delTag (text) {
  var tmp = unescape(text);
  tmp = tmp.replace(/&amp;/gi,"&");

  // &...&
  var pattern = "&tag=[a-zA-Z0-9.-]*-[0-9]{1,2}&";
  var exp = new RegExp(pattern, "g");
  tmp = tmp.replace(exp,"&");

  // &...
  pattern = "&tag=[a-zA-Z0-9.-]*-[0-9]{1,2}";
  exp = new RegExp(pattern, "g");
  tmp = tmp.replace(exp,"");

  // ?...&
  pattern = "\\?tag=[a-zA-Z0-9.-]*-[0-9]{1,2}&";
  exp = new RegExp(pattern, "g");
  tmp = tmp.replace(exp,"?");

  // ?...
  pattern = "\\?tag=[a-zA-Z0-9.-]*-[0-9]{1,2}";
  exp = new RegExp(pattern, "g");
  tmp = tmp.replace(exp,"");


  return tmp;
}

function clearText (text,site) {
  var tmp = unescape(text);
  tmp = tmp.replace(/&amp;/gi,"&");
  var result;

  // Filtro 1
  var pattern = "http(s?)://[w]{0,3}.?"+site+"/(.*)/dp/B([A-Z0-9]{9})/?.*";
  var exp = new RegExp(pattern, "gi");
  if (result = exp.exec(tmp))
    tmp = "http"+result[1]+"://www."+site+"/dp/B"+result[3]+"/"+result[2]+"/";

  // Filtro 2
  pattern = "http(s?)://[w]{0,3}.?"+site+"/(.*)/dp/([A-Z0-9]{9,10})/?.*";
  exp = new RegExp(pattern, "gi");
  if (result = exp.exec(tmp))
    tmp = "http"+result[1]+"://www."+site+"/dp/B"+result[3]+"/"+result[2]+"/";

  // Filtro 3
  pattern = "http(s?)://[w]{0,3}.?"+site+"/gp/product/([A-Z0-9]{9,10}).*";
  exp = new RegExp(pattern, "gi");
  if (result = exp.exec(tmp))
    tmp = "http"+result[1]+"://www."+site+"/gp/product/"+result[2]+"/";

  // Filtro 5 (link.php)
  pattern = "http(s?)://[w]{0,3}.?.*?/link\.php\?url\=(.*)";
  exp = new RegExp(pattern, "gi");
  if (result = exp.exec(tmp))
    tmp = result[2];

  // Filtro 6 (limpiar por delante)
  pattern = ".*http(s?)://[w]{0,3}.?"+site+"/(.*)";
  exp = new RegExp(pattern, "gi");
  if (result = exp.exec(tmp))
    tmp = "http"+result[1]+"://www."+site+"/"+result[2];

  return tmp;
}

for (var n = 0; n < sites.length; n++) {
    var links = document.evaluate("//a[contains(@href, '"+sites[n]+"')]", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0; i < links.snapshotLength; i++)
    {
        var link = links.snapshotItem(i);
        link.href = clearText(decodeURIComponent(link.href),sites[n]);
        link.href = delTag(link.href);
    }
}