//<script>
/*

  Esta librería permite interactuar con un servidor mediante un contacto del tipo
  xml_http_request. La técnica se denomina Ajax.

  Requiere:
  - prototype.js
  - enumerable.js
  - string.js

*/

Ajax.Ping = Class.create();
Ajax.Ping.prototype = {
  initialize: function(url, object, value, pattern, options) {
    this.url = url;
    this.options = options;
    this.pattern = pattern;
    this.params = new Object();
    this.params['object'] = object;
    this.params['value'] = eval(Ajax.decode(value));
    this.save();
  },

  save: function() {
    if (this.params['object']) {
      if (this.params['value'] == null) return;
      if (!this.pattern.exec(this.params['value'])) return;
      this.url = this.url + '/%s'.ins(Ajax.response(this.params))
    }
    new Ajax.Request(this.url, this.options);
  }
}

Ajax.response = function(params) {
  var response = new Array();
  params.each_pair(function(key, value) {
    response.push('%s=%s'.ins(key, Ajax.encode(value)));
  });
  return response.join(':');
}

Ajax.retrieve = function(params) {
  result = new Array();
  params = params.split(':');
  params.each(function(pair) {
    elements = pair.split('=');
    key = elements.shift();
    value = elements.join('=');
    result[key] = Ajax.decode(value);
  });
  return result;
}

Ajax.decode = function (str) {
  return decode64(str.replace(/SLASH/, '/').replace(/COLON/, ':'));
}

Ajax.encode = function (str) {
  return encode64(str).replace(/\//, 'SLASH').replace(/:/, 'COLON');
}

//----------------------------------------------
// Base54 encode/decode
//----------------------------------------------

var keyStr = "ABCDEFGHIJKLMNOP" +
  "QRSTUVWXYZabcdef" +
  "ghijklmnopqrstuv" +
  "wxyz0123456789+/" +
  "=";

function encode64(input) {
  var output = "";
  var chr1, chr2, chr3 = "";
  var enc1, enc2, enc3, enc4 = "";
  var i = 0;

  do {
    chr1 = input.charCodeAt(i++);
    chr2 = input.charCodeAt(i++);
    chr3 = input.charCodeAt(i++);

    enc1 = chr1 >> 2;
    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
    enc4 = chr3 & 63;

    if (isNaN(chr2)) {
      enc3 = enc4 = 64;
    } else if (isNaN(chr3)) {
      enc4 = 64;
    }

    output = output +
    keyStr.charAt(enc1) +
    keyStr.charAt(enc2) +
    keyStr.charAt(enc3) +
    keyStr.charAt(enc4);
    chr1 = chr2 = chr3 = "";
    enc1 = enc2 = enc3 = enc4 = "";
  } while (i < input.length);

  return output;
}

function decode64(input) {
  var output = "";
  var chr1, chr2, chr3 = "";
  var enc1, enc2, enc3, enc4 = "";
  var i = 0;

  // Remove all characters that are not A-Z, a-z, 0-9, +, /, or =
  input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

  do {
    enc1 = keyStr.indexOf(input.charAt(i++));
    enc2 = keyStr.indexOf(input.charAt(i++));
    enc3 = keyStr.indexOf(input.charAt(i++));
    enc4 = keyStr.indexOf(input.charAt(i++));

    chr1 = (enc1 << 2) | (enc2 >> 4);
    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    chr3 = ((enc3 & 3) << 6) | enc4;

    output = output + String.fromCharCode(chr1);

    if (enc3 != 64) {
      output = output + String.fromCharCode(chr2);
    }
    if (enc4 != 64) {
      output = output + String.fromCharCode(chr3);
    }

    chr1 = chr2 = chr3 = "";
    enc1 = enc2 = enc3 = enc4 = "";

  } while (i < input.length);

  return output;
}

//</script>