// /**
//  * File: TokenReader.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.IO;
using System.Text;
using System.Linq;
namespace ln.http.message
{
    public class TokenReader : TextReader
    {
        public static char[] specialChars = new char[] { '(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=' };

        public TextReader BaseReader { get; }

        public TokenReader(String text)
            :this(new StringReader(text))
        {}
        public TokenReader(TextReader baseReader)
        {
            BaseReader = baseReader;
        }

        public override int Read() => BaseReader.Read();
        public override int Peek() => BaseReader.Peek();

        public string ReadToken()
        {
            while ((BaseReader.Peek() != -1) && char.IsWhiteSpace((char)BaseReader.Peek()))
                BaseReader.Read();

            StringBuilder stringBuilder = new StringBuilder();
            int ch;
            do
            {
                ch = BaseReader.Peek();

                if ((ch <= ' ') || specialChars.Contains((char)ch))
                    return stringBuilder.ToString();

                stringBuilder.Append((char)BaseReader.Read());
            } while (ch != -1);

            return stringBuilder.ToString();
        }

        public string ReadQuotedString()
        {
            StringBuilder stringBuilder = new StringBuilder();

            if (BaseReader.Read() != '"')
                throw new FormatException("quoted string must start with \"");

            int ch;
            while (((ch = BaseReader.Read()) != -1) && (ch != '"'))
                stringBuilder.Append((char)ch);

            return stringBuilder.ToString();
        }

    }
}