Selector.cs


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

namespace HtmlSerializer
{
    public 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 FromQuery(string query)
        {
            var levels = query.Split(' ', StringSplitOptions.RemoveEmptyEntries);

            Selector root = new Selector();
            Selector current = root;

            foreach (var level in levels)
            {
                var sel = new Selector();
                var parts = Regex.Split(level, "(?=[#\\.])");

                foreach (var part in parts)
                {
                    if (part.StartsWith("#"))
                        sel.Id = part.Substring(1);
                    else if (part.StartsWith("."))
                        sel.Classes.Add(part.Substring(1));
                    else
                        sel.TagName = part;
                }

                current.Child = sel;
                sel.Parent = current;
                current = sel;
            }

            return root.Child; 
        }

    }

}