/** 
* @projectDescription 	Poly9's polyvalent URLParser class
*
* @author	Denis Laprise - denis@poly9.com - http://poly9.com
* @version	0.1 
* @namespace	Poly9
*
* Usage: var p = new Poly9.URLParser('http://user:password@poly9.com/pathname?arguments=1#fragment');
* p.getHost() == 'poly9.com';
* p.getProtocol() == 'http';
* p.getPathname() == '/pathname';
* p.getQuerystring() == 'arguments=1';
* p.getFragment() == 'fragment';
* p.getUsername() == 'user';
* p.getPassword() == 'password';
*
* See the unit test file for more examples.
* URLParser is freely distributable under the terms of an MIT-style license.
*/

if (typeof Poly9 == 'undefined')
 var Poly9 = {};

/**
 * Creates an URLParser instance
 *
 * @classDescription	Creates an URLParser instance
 * @return {Object}	return an URLParser object
 * @param {String} url	The url to parse
 * @constructor
 * @exception {String}  Throws an exception if the specified url is invalid
 */
Poly9.URLParser = function(url) {
 this._fields = {'Username' : 4, 'Password' : 5, 'Port' : 7, 'Protocol' : 2, 'Host' : 6, 'Pathname' : 8, 'URL' : 0, 'Querystring' : 9, 'Fragment' : 10};
 this._values = {};
 this._regex = null;
 this.version = 0.1;
 this._regex = /^((\w+):\/\/)?((\w+):?(\w+)?@)?([^\/\?:]+):?(\d+)?(\/?[^\?#]+)?\??([^#]+)?#?(\w*)/;
 for(var f in this._fields)
  this['get' + f] = this._makeGetter(f);
 if (typeof url != 'undefined')
  this._parse(url);
}
 
/**
 * @method 
 * @param {String} url	The url to parse
 * @exception {String} 	Throws an exception if the specified url is invalid
 */
Poly9.URLParser.prototype.setURL = function(url) {
  this._parse(url);
}

Poly9.URLParser.prototype._initValues = function() {
   for(var f in this._fields)
   this._values[f] = '';
}

Poly9.URLParser.prototype._parse = function(url) {
  this._initValues();
  var r = this._regex.exec(url);
  if (!r) throw "DPURLParser::_parse -> Invalid URL"
  for(var f in this._fields) if (typeof r[this._fields[f]] != 'undefined')
   this._values[f] = r[this._fields[f]];
}

Poly9.URLParser.prototype._makeGetter = function(field) {
 return function() {
  return this._values[field];
 }
}