// /**
//  * File: CharStream.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
namespace ln.types.stream
{
    public class CharStream
    {
        public char Current => characters[position];
        public int Position => position;

        char[] characters;
        int position;

        public CharStream(IEnumerable<char> characters)
            : this(characters.ToArray()) { }

        public CharStream(char[] characters)
        {
            this.characters = characters;
        }

        public bool TryNext()
        {
            position++;
            return (position < this.characters.Length);
        }
        public void MoveNext()
        {
            position++;
            if (position >= this.characters.Length)
                throw new IOException("Unexpected end of characters");
        }

        public void Skip(Func<char, bool> test)
        {
            if (position < this.characters.Length)
                while (test(Current) && TryNext())
                {
                }
        }
        public char[] Read(Func<char, bool> test)
        {
            List<char> chars = new List<char>();

            while (test(Current))
            {
                chars.Add(Current);
                MoveNext();
            }

            return chars.ToArray();
        }


    }
}