Function _EncodeEmailAddress

public/libs/showdown.js:1295–1347

(addr)

var _EncodeEmailAddress = function(addr) {
//
//  Input: an email address, e.g. "foo@example.com"
//
//  Output: the email address as a mailto link, with each character
//  of the address encoded as either a decimal or hex entity, in
//  the hopes of foiling most address harvesting spam bots. E.g.:
//
//  <a href="&#x6D;&#97;&#105;&#108;&#x74;&#111;:&#102;&#111;&#111;&#64;&#101;
//     x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;">&#102;&#111;&#111;
//     &#64;&#101;x&#x61;&#109;&#x70;&#108;&#x65;&#x2E;&#99;&#111;&#109;</a>
//
//  Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
//  mailing list: <http://tinyurl.com/yu7ue>
//

  // attacklab: why can't javascript speak hex?
  function char2hex(ch) {
    var hexDigits = '0123456789ABCDEF';
    var dec = ch.charCodeAt(0);
    return(hexDigits.charAt(dec>>4) + hexDigits.charAt(dec&15));
  }

  var encode = [
    function(ch){return "&#"+ch.charCodeAt(0)+";";},
    function(ch){return "&#x"+char2hex(ch)+";";},
    function(ch){return ch;}
  ];

  addr = "mailto:" + addr;

  addr = addr.replace(/./g, function(ch) {
    if (ch == "@") {
        // this *must* be encoded. I insist.
      ch = encode[Math.floor(Math.random()*2)](ch);
    } else if (ch !=":") {
      // leave ':' alone (to spot mailto: later)
      var r = Math.random();
      // roughly 10% raw, 45% hex, 45% dec
      ch =  (
          r > .9  ? encode[2](ch)   :
          r > .45 ? encode[1](ch)   :
                encode[0](ch)
        );
    }
    return ch;
  });

  addr = "<a href=\"" + addr + "\">" + addr + "</a>";
  addr = addr.replace(/">.+:/g,"\">"); // strip the mailto: from the visible part

  return addr;
}


var _UnescapeSpecialChars = function(text) {