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;
        }
	}
}