jquery.url.js

// JQuery URL Parser plugin - https://github.com/allmarkedup/jQuery-URL-Parser
// Written by Mark Perkins, mark@allmarkedup.com
// License: http://unlicense.org/ (i.e. do what you want with it!)

;(function($, undefined) {
    
    var tag2attr = {
        a       : 'href',
        img     : 'src',
        form    : 'action',
        base    : 'href',
        script  : 'src',
        iframe  : 'src',
        link    : 'href'
    },
    
	key = ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","fragment"], // keys available to query
	
	aliases = { "anchor" : "fragment" }, // aliases for backwards compatability

	parser = {
		strict  : /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,  //less intuitive, more accurate to the specs
		loose   :  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/ // more intuitive, fails on relative paths and deviates from specs
	},
	
	querystring_parser = /(?:^|&|;)([^&=;]*)=?([^&;]*)/g, // supports both ampersand and semicolon-delimted query string key/value pairs
	
	fragment_parser = /(?:^|&|;)([^&=;]*)=?([^&;]*)/g; // supports both ampersand and semicolon-delimted fragment key/value pairs
	
	function parseUri( url, strictMode )
	{
		var str = decodeURI( url ),
		    res   = parser[ strictMode || false ? "strict" : "loose" ].exec( str ),
		    uri = { attr : {}, param : {}, seg : {} },
		    i   = 14;
		
		while ( i-- )
		{
			uri.attr[ key[i] ] = res[i] || "";
		}
		
		// build query and fragment parameters
		
		uri.param['query'] = {};
		uri.param['fragment'] = {};
		
		uri.attr['query'].replace( querystring_parser, function ( $0, $1, $2 ){
			if ($1)
			{
				uri.param['query'][$1] = $2;
			}
		});
		
		uri.attr['fragment'].replace( fragment_parser, function ( $0, $1, $2 ){
			if ($1)
			{
				uri.param['fragment'][$1] = $2;
			}
		});
				
		// split path and fragement into segments
		
        uri.seg['path'] = uri.attr.path.replace(/^\/+|\/+$/g,'').split('/');
        
        uri.seg['fragment'] = uri.attr.fragment.replace(/^\/+|\/+$/g,'').split('/');
        
        // compile a 'base' domain attribute
        
        uri.attr['base'] = uri.attr.host ? uri.attr.protocol+"://"+uri.attr.host + (uri.attr.port ? ":"+uri.attr.port : '') : '';
        
		return uri;
	};
	
	function getAttrName( elm )
	{
		var tn = elm.tagName;
		if ( tn !== undefined ) return tag2attr[tn.toLowerCase()];
		return tn;
	}
	
	$.fn.url = function( strictMode )
	{
	    var url = '';
	    
	    if ( this.length )
	    {
	        url = $(this).attr( getAttrName(this[0]) ) || '';
	    }
	    
        return $.url({ url : url, strict : strictMode });
	};
	
	$.url = function( opts )
	{
	    var url     = '',
	        strict  = false;

	    if ( typeof opts === 'string' )
	    {
	        url = opts;
	    }
	    else
	    {
	        opts = opts || {};
	        strict = opts.strict || strict;
            url = opts.url === undefined ? window.location.toString() : opts.url;
	    }
	    	            
        return {
            
            data : parseUri(url, strict),
            
            // get various attributes from the URI
            attr : function( attr )
            {
                attr = aliases[attr] || attr;
                return attr !== undefined ? this.data.attr[attr] : this.data.attr;
            },
            
            // return query string parameters
            param : function( param )
            {
                return param !== undefined ? this.data.param.query[param] : this.data.param.query;
            },
            
            // return fragment parameters
            fparam : function( param )
            {
                return param !== undefined ? this.data.param.fragment[param] : this.data.param.fragment;
            },
            
            // return path segments
            segment : function( seg )
            {
                if ( seg === undefined )
                {
                    return this.data.seg.path;                    
                }
                else
                {
                    seg = seg < 0 ? this.data.seg.path.length + seg : seg - 1; // negative segments count from the end
                    return this.data.seg.path[seg];                    
                }
            },
            
            // return fragment segments
            fsegment : function( seg )
            {
                if ( seg === undefined )
                {
                    return this.data.seg.fragment;                    
                }
                else
                {
                    seg = seg < 0 ? this.data.seg.fragment.length + seg : seg - 1; // negative segments count from the end
                    return this.data.seg.fragment[seg];                    
                }
            }
            
        };
        
	};
	
})(jQuery);