Selector.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Html_Serializer
{
    internal class Selector
    {
        public string TagName { get; set; }
        public string Id { get; set; }
        public List<string> Classes { get; set; } = new List<string>();
        public Selector Parent { get; set; }
        public Selector Child { get; set; }
        public static Selector Casting(string query)
        {
            string[] arr = query.Split(' ');
            Selector current = null, root = null;
            foreach (string s in arr)
            {
                Selector selector = new Selector();
                var match = Regex.Match(s, @"^(?<name>\w+)(#(?<id>[\w-]+))?(\.(?<classes>[\w.-]+))?$");
                if (match.Success)
                {
                    selector.TagName = match.Groups["name"].Value;
                    selector.Id = match.Groups["id"].Value;
                    selector.Classes = match.Groups["classes"].Success
                    ? match.Groups["classes"].Value.Split('.').ToList() : new List<string>();
                }
                if (current != null)
                {
                    current.Child = selector;
                    selector.Parent = current;
                }
                else
                    root = selector;
                current = selector;
            }
            return root;
        }
    }
}