path.js

exports.normalizeArray = function(arr) {
    var [final_array, items, item] = [ [], arr.slice(0), null ];                                                                                             
    while(items.length){                                                                                                                                     
        item = items.shift();                                                                                                                                
        if( (item == undefined) || (item == '') || (item == '.') ){
            // do nothing
        } else if(item == '..'){                                                                                                                             
            final_array.pop();                                                                                                                               
        } else {                                                                                                                                             
            final_array.push(item);
        }
    }
    return final_array;
};

exports.normalize = function(p) {                                                                                                                            
    var final_array = exports.normalizeArray(p.split('/'));                                                                                                  
    var start = (p.charAt(0) == '/') ? '/' : '';                                                                                                             
    return start + final_array.join('/');                                                                                                                    
};  
    
exports.join = function() {
    var items = Array.prototype.slice.call(arguments);
    return exports.normalize(items.join('/'));
};  
                                                                                                                                                             
exports.extname = function(p) {
    var ext = p.match(/\.([^\.]+)$/);                                                                                                                        
    return ext[1];                                                                                                                                           
};