path/path.js at master · aino/path · GitHub

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/*
 * Path v 1.2 2011-02-12
 *
 * Copyright (c) 2011, Aino
 * Licensed under the MIT license.
 */

(function($) {

    var window = this,

        absUrl = function( url ) {

            var l = window.location, h, p, f, i, n;

            if ( /^\w+:/.test( url ) ) {
                return url.toString();
            }

            h = l.protocol + '//' + l.host;
            if ( url.indexOf( '/' ) === 0 ) {
                return h + url.toString();
            }

            p = l.pathname.replace( /\/[^\/]*$/, '' );
            f = url.match(/\.\.\//g);

            if ( f ) {
                n = url.substring(f.length * 3);
                for ( i = f.length; i--; ) {
                    p = p.substring(0, p.lastIndexOf('/'));
                }
            } else {
                n = url.toString();
            }
            return h + p + '/' + n;

        },

        compareArray = function( o, t ) {

            var i;

            if ( o.length !== t.length ) {
                return false;
            }

            for ( i = 0; i < t.length; i++ ) {
                if ( o[i] !== t[i] ) {
                    return false;
                }
            }
            return true;
        },

        trim = function( url ) {
            return url.replace(/#.*$/,'').replace(/\?.*/,'').replace(/\/$/,'');
        },

        location = trim( window.location.href ).split('/'),

        isAnchor = function( elem ) {
            return !!( elem.href && elem.nodeName.toUpperCase() === 'A' );
        },

        href = function( elem ) {
            return trim( absUrl( elem.href ) ).split('/');
        };

    $.extend( $.expr[":"], {

        path : function( elem ) {

            if ( !isAnchor( elem ) ) {
                return false;
            }

            var anchor = href( elem );

            // if anchor points to root, activate if arrays are equal
            if ( anchor.length === 3) {
                return compareArray( location, anchor );
            }

            return ( location.length < anchor.length ) ? false :
                compareArray( location.slice( 0, anchor.length ), anchor );

        },

        current: function( elem ) {

            if ( !isAnchor( elem ) ) {
                return false;
            }

            var anchor = href( elem );

            return compareArray( location, anchor );

        }
    });

}( jQuery ));