using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NUnit.Framework;

namespace TableParser
{
    [TestFixture]
    public class QuotedFieldTaskTests
    {
        [TestCase("''", 0, "", 2)]
        [TestCase("'a'", 0, "a", 3)]
        public void Test(string line, int startIndex, string expectedValue, int expectedLength)
        {
            var actualToken = QuotedFieldTask.ReadQuotedField(line, startIndex);
            Assert.AreEqual(actualToken, new Token(expectedValue, startIndex, expectedLength));
        }

        // Добавьте свои тесты
    }

    class QuotedFieldTask
    {
        public static Token ReadQuotedField(string line, int startIndex)
        {
            var character = line[startIndex];
            var len = 1;
            var value = "";
            var slash = false;
            for (var i = startIndex + 1; i <= line.Length; i++)
            {
                if (i == line.Length)
                {
                    len = line.Length - startIndex;
                    break;
                }
                if (line[i] == '\\' && !slash)
                {
                    slash = true;
                    len++;
                }
                else if (slash)
                {
                    len++;
                    value += line[i];
                    slash = !slash;
                }
                else if (line[i] == character)
                {
                    len++;
                    break;
                }
                else
                {
                    len++;
                    value += line[i];
                }
            }
            return new Token(value, startIndex, len);
        }
    }
}