README.md

##Example

var p = new path('http://abc.com/aa/bb/cc');
p.cd('../../ww');
p.toString();
//returns "http://abc.com/aa/ww"
p.cd('/').toString();
//returns "http://abc.com"

path.js

;(function () {
    this.path = function (dir) {
        var temp = dir.split(/(\w+\:\/\/[\w.]+)/);
        var root = '';
        if (!temp[0] && !temp.shift())
            root = temp.shift();
        var _path = temp.pop().split('/');
        if (_path[0] === '')
            _path.shift();

        this.upDir = function () {
            _path.pop();
            return this;
        };
        this.toString = function () {
            if (_path.length)
                return root + '/' + _path.join('/');
            else
                return root || '/';
        };

        var self = this;

        function _cd(param) {
            var head = param.shift();
            if (head === '..')
                _path.pop();
            else if (head !== '.' && head !== '')
                _path.push(head);
            if (param.length)
                return _cd(param);
            else
                return self;
        }

        this.cd = function (str) {
            if (!str)
                return this;
            var param = str.split('/');
            if (param[0] === '') {
                param.shift();
                _path = [];
            }
            return _cd(param);
        };
    }
})();