using System.Collections.Generic;

namespace Ink
{

	public class CharacterSet : HashSet<char>
	{
		public static CharacterSet FromRange(char start, char end) 
		{
			return new CharacterSet ().AddRange (start, end);
		}

		public CharacterSet ()
		{
		}

		public CharacterSet(string str)
		{
            AddCharacters (str);
		}

        public CharacterSet(CharacterSet charSetToCopy)
        {
            AddCharacters (charSetToCopy);
        }

		public CharacterSet AddRange(char start, char end)
		{
			for(char c=start; c<=end; ++c) {
				Add (c);
			}
			return this;
		}

		public CharacterSet AddCharacters(IEnumerable<char> chars)
		{
            foreach (char c in chars) {
				Add (c);
			}
			return this;
		}

        public CharacterSet AddCharacters (string chars)
        {
        	foreach (char c in chars) {
        		Add (c);
        	}
        	return this;
        }

	}
}