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

namespace TableParser
{
    [TestFixture]
    public class QuotedFieldTaskTests
    {
        [TestCase("''", 0, "", 2)]
        [TestCase("'a'", 0, "a", 3)]
        [TestCase("'abc'", 0, "abc", 5)]
        [TestCase("'a\\\''", 0, "a\'", 5)]
        [TestCase("\'\'", 0, "", 2)]
        [TestCase("'a\"\"'", 0, "a\"\"", 5)]
        [TestCase("'b\"a'\"", 2, "a\'", 4)]

        //[TestCase("\'\'\'\'", 0, "", 5)]
        //[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 q = line[startIndex];
            var otherQ = q.ToString() == "\'" ? "\"" : "\'";
            var i = startIndex+1;
            while (line[i] != q || line.Length>1 && line[i] == q && line[i - 1].ToString() == "\\")
            {
                if (line[i] == q && line[i - 1].ToString() == "\\") i++;
                if (i == line.Length - 1) break;
                i++;
            }

            line = line.Substring(startIndex+1, i - startIndex-1);
			Console.WriteLine(line);

            var res = "";
            var j = 0;
            while (j < line.Length)
            {
				if (j == line.Length-1)
				{
					res+= line[line.Length-1];
					break;
				}
                if ((line[j].ToString() == "\\" || line[j].ToString() == otherQ))
				{
					j++;
					continue;
				}
				res += line[j];
                j++;
            }

            return new Token(res, startIndex, line.Length+2);
        }
    }
}