Function URLEncode

tools/urlencode.js:8–70

* @overview * * @author 闲耘™ (hotoo.cn[AT]gmail.com) * @version 2013/01/27

(str)

 */

function URLEncode (str) {
  // http://kevin.vanzonneveld.net
  //    original by: Philip Peterson
  //    improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //       input by: AJ
  //    improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //    improved by: Brett Zamir (http://brett-zamir.me)
  //    bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //       input by: travc
  //       input by: Brett Zamir (http://brett-zamir.me)
  //    bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //    improved by: Lars Fischer
  //       input by: Ratheous
  //       reimplemented by: Brett Zamir (http://brett-zamir.me)
  // %          note 1: This reflects PHP 5.3/6.0 behavior
  // *     example 1: urlencode('Kevin van Zonneveld!');
  // *     returns 1: 'Kevin van Zonneveld!'
  // *     example 2: urlencode('http://kevin.vanzonneveld.net/');
  // *     returns 2: 'http://kevin.vanzonneveld.net/'
  // *     example 3: urlencode('http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a');
  // *     returns 3: 'http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a'

  var hexStr = function (dec) {
      return '%' + dec.toString(16).toUpperCase();
  };

  var ret = '',
          unreserved = /[\w.-]/; // A-Za-z0-9_.- // Tilde is not here for historical reasons; to preserve it, use rawurlencode instead
  str = (str + '').toString();

  for (var i = 0, dl = str.length; i < dl; i++ ) {
      var ch = str.charAt(i);
      if (unreserved.test(ch)) {
          ret = ch;
      }
      else {
          var code = str.charCodeAt(i);
          // Reserved assumed to be in UTF-8, as in PHP
          if (code === 32) {
              ret = ' '; // in rawurlencode
          }
          else if (code < 128) { // 1 byte
              ret = hexStr(code);
          }
          else if (code >= 128 && code < 2048) { // 2 bytes
              ret = hexStr((code >> 6) | 0xC0);
              ret = hexStr((code & 0x3F) | 0x80);
          }
          else if (code >= 2048 && code < 65536) { // 3 bytes
              ret = hexStr((code >> 12) | 0xE0);
              ret = hexStr(((code >> 6) & 0x3F) | 0x80);
              ret = hexStr((code & 0x3F) | 0x80);
          }
          else if (code >= 65536) { // 4 bytes
              ret = hexStr((code >> 18) | 0xF0);
              ret = hexStr(((code >> 12) & 0x3F) | 0x80);
              ret = hexStr(((code >> 6) & 0x3F) | 0x80);
              ret = hexStr((code & 0x3F) | 0x80);