(function($) {

	// Copyright (c) 2011 John Resig, http://jquery.com/

	// Permission is hereby granted, free of charge, to any person obtaining
	// a copy of this software and associated documentation files (the
	// "Software"), to deal in the Software without restriction, including
	// without limitation the rights to use, copy, modify, merge, publish,
	// distribute, sublicense, and/or sell copies of the Software, and to
	// permit persons to whom the Software is furnished to do so, subject to
	// the following conditions:

	// The above copyright notice and this permission notice shall be
	// included in all copies or substantial portions of the Software.

	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
	// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

	//define vars for interal use
	var $window = $( window ),
		$html = $( 'html' ),
		$head = $( 'head' ),

		//url path helpers for use in relative url management
		path = {

			// This scary looking regular expression parses an absolute URL or its relative
			// variants (protocol, site, document, query, and hash), into the various
			// components (protocol, host, path, query, fragment, etc that make up the
			// URL as well as some other commonly used sub-parts. When used with RegExp.exec()
			// or String.match, it parses the URL into a results array that looks like this:
			//
			//     [0]: http://jblas:password@mycompany.com:8080/mail/inbox?msg=1234&type=unread#msg-content
			//     [1]: http://jblas:password@mycompany.com:8080/mail/inbox?msg=1234&type=unread
			//     [2]: http://jblas:password@mycompany.com:8080/mail/inbox
			//     [3]: http://jblas:password@mycompany.com:8080
			//     [4]: http:
			//     [5]: //
			//     [6]: jblas:password@mycompany.com:8080
			//     [7]: jblas:password
			//     [8]: jblas
			//     [9]: password
			//    [10]: mycompany.com:8080
			//    [11]: mycompany.com
			//    [12]: 8080
			//    [13]: /mail/inbox
			//    [14]: /mail/
			//    [15]: inbox
			//    [16]: ?msg=1234&type=unread
			//    [17]: #msg-content
			//
			urlParseRE: /^(((([^:\/#\?]+:)?(?:(\/\/)((?:(([^:@\/#\?]+)(?:\:([^:@\/#\?]+))?)@)?(([^:\/#\?\]\[]+|\[[^\/\]@#?]+\])(?:\:([0-9]+))?))?)?)?((\/?(?:[^\/\?#]+\/+)*)([^\?#]*)))?(\?[^#]+)?)(#.*)?/,

			//Parse a URL into a structure that allows easy access to
			//all of the URL components by name.
			parseUrl: function( url ) {
				// If we're passed an object, we'll assume that it is
				// a parsed url object and just return it back to the caller.
				if ( $.type( url ) === "object" ) {
					return url;
				}

				var matches = path.urlParseRE.exec( url || "" ) || [];

					// Create an object that allows the caller to access the sub-matches
					// by name. Note that IE returns an empty string instead of undefined,
					// like all other browsers do, so we normalize everything so its consistent
					// no matter what browser we're running on.
					return {
						href:         matches[  0 ] || "",
						hrefNoHash:   matches[  1 ] || "",
						hrefNoSearch: matches[  2 ] || "",
						domain:       matches[  3 ] || "",
						protocol:     matches[  4 ] || "",
						doubleSlash:  matches[  5 ] || "",
						authority:    matches[  6 ] || "",
						username:     matches[  8 ] || "",
						password:     matches[  9 ] || "",
						host:         matches[ 10 ] || "",
						hostname:     matches[ 11 ] || "",
						port:         matches[ 12 ] || "",
						pathname:     matches[ 13 ] || "",
						directory:    matches[ 14 ] || "",
						filename:     matches[ 15 ] || "",
						search:       matches[ 16 ] || "",
						hash:         matches[ 17 ] || ""
					};
			},

			//Turn relPath into an asbolute path. absPath is
			//an optional absolute path which describes what
			//relPath is relative to.
			makePathAbsolute: function( relPath, absPath ) {
				if ( relPath && relPath.charAt( 0 ) === "/" ) {
					return relPath;
				}

				relPath = relPath || "";
				absPath = absPath ? absPath.replace( /^\/|(\/[^\/]*|[^\/]+)$/g, "" ) : "";

				var absStack = absPath ? absPath.split( "/" ) : [],
					relStack = relPath.split( "/" );
				for ( var i = 0; i < relStack.length; i++ ) {
					var d = relStack[ i ];
					switch ( d ) {
						case ".":
							break;
						case "..":
							if ( absStack.length ) {
								absStack.pop();
							}
							break;
						default:
							absStack.push( d );
							break;
					}
				}
				return "/" + absStack.join( "/" );
			},

			//Returns true if both urls have the same domain.
			isSameDomain: function( absUrl1, absUrl2 ) {
				return path.parseUrl( absUrl1 ).domain === path.parseUrl( absUrl2 ).domain;
			},

			//Returns true for any relative variant.
			isRelativeUrl: function( url ) {
				// All relative Url variants have one thing in common, no protocol.
				return path.parseUrl( url ).protocol === "";
			},

			//Returns true for an absolute url.
			isAbsoluteUrl: function( url ) {
				return path.parseUrl( url ).protocol !== "";
			},

			//Turn the specified realtive URL into an absolute one. This function
			//can handle all relative variants (protocol, site, document, query, fragment).
			makeUrlAbsolute: function( relUrl, absUrl ) {
				if ( !path.isRelativeUrl( relUrl ) ) {
					return relUrl;
				}

				var relObj = path.parseUrl( relUrl ),
					absObj = path.parseUrl( absUrl ),
					protocol = relObj.protocol || absObj.protocol,
					doubleSlash = relObj.protocol ? relObj.doubleSlash : ( relObj.doubleSlash || absObj.doubleSlash ),
					authority = relObj.authority || absObj.authority,
					hasPath = relObj.pathname !== "",
					pathname = path.makePathAbsolute( relObj.pathname || absObj.filename, absObj.pathname ),
					search = relObj.search || ( !hasPath && absObj.search ) || "",
					hash = relObj.hash;

				return protocol + doubleSlash + authority + pathname + search + hash;
			},

			//Add search (aka query) params to the specified url.
			addSearchParams: function( url, params ) {
				var u = path.parseUrl( url ),
					p = ( typeof params === "object" ) ? $.param( params ) : params,
					s = u.search || "?";
				return u.hrefNoSearch + s + ( s.charAt( s.length - 1 ) !== "?" ? "&" : "" ) + p + ( u.hash || "" );
			},

			convertUrlToDataUrl: function( absUrl ) {
				var u = path.parseUrl( absUrl );
				if ( path.isEmbeddedPage( u ) ) {
					// For embedded pages, remove the dialog hash key as in getFilePath(),
					// otherwise the Data Url won't match the id of the embedded Page.
					return u.hash.split( dialogHashKey )[0].replace( /^#/, "" );
				} else if ( path.isSameDomain( u, documentBase ) ) {
					return u.hrefNoHash.replace( documentBase.domain, "" );
				}
				return absUrl;
			},

			//get path from current hash, or from a file path
			get: function( newPath ) {
				if( newPath === undefined ) {
					newPath = location.hash;
				}
				return path.stripHash( newPath ).replace( /[^\/]*\.[^\/*]+$/, '' );
			},

			//return the substring of a filepath before the sub-page key, for making a server request
			getFilePath: function( path ) {
				var splitkey = '&' + $.mobile.subPageUrlKey;
				return path && path.split( splitkey )[0].split( dialogHashKey )[0];
			},

			//set location hash to path
			set: function( path ) {
				location.hash = path;
			},

			//test if a given url (string) is a path
			//NOTE might be exceptionally naive
			isPath: function( url ) {
				return ( /\// ).test( url );
			},

			//return a url path with the window's location protocol/hostname/pathname removed
			clean: function( url ) {
				return url.replace( documentBase.domain, "" );
			},

			//just return the url without an initial #
			stripHash: function( url ) {
				return url.replace( /^#/, "" );
			},

			//remove the preceding hash, any query params, and dialog notations
			cleanHash: function( hash ) {
				return path.stripHash( hash.replace( /\?.*$/, "" ).replace( dialogHashKey, "" ) );
			},

			//check whether a url is referencing the same domain, or an external domain or different protocol
			//could be mailto, etc
			isExternal: function( url ) {
				var u = path.parseUrl( url );
				return u.protocol && u.domain !== documentUrl.domain ? true : false;
			},

			hasProtocol: function( url ) {
				return ( /^(:?\w+:)/ ).test( url );
			}
	};
	
	$.path = path;
}(jQuery));
