Utils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using Microsoft.VisualBasic.FileIO;
using tp1;

namespace tpfinal
{
    internal class Utils
    {
        private static string patron = "";
        public static int lineCount;

        public static void init_patron()
        {
            //patron = System.IO.Directory.GetCurrentDirectory();
            //lineCount = File.ReadLines(@patron).Count();
        }

        public static void set_patron(string patron_parm)
        {
            patron = patron_parm;
            //lineCount = File.ReadLines(@patron).Count();
        }
        public static string get_patron()
        {
            if (patron == null)
            {
                patron = ""; // System.IO.Directory.GetCurrentDirectory();
                //lineCount = File.ReadLines(@patron).Count();

            }
            
            return patron;  
        }



        public static string RemoveSpecialCharacters(string str)
        {
            StringBuilder sb = new StringBuilder();
            //string str = str_input.Replace(' ', '_');
            foreach (char c in str)
            {
                if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_' || c == ' ')
                {
                    sb.Append(c);
                }
            }
            return sb.ToString();
        }

		public static IEnumerable<IList<string>> Parse(TextReader reader, char delimiter, char qualifier)
		{
			var inQuote = false;
			var record = new List<string>();
			var sb = new StringBuilder();

			while (reader.Peek() != -1)
			{
				var readChar = (char)reader.Read();

				if (readChar == '\n' || (readChar == '\r' && (char)reader.Peek() == '\n'))
				{
					// If it's a \r\n combo consume the \n part and throw it away.
					if (readChar == '\r')
						reader.Read();

					if (inQuote)
					{
						if (readChar == '\r')
							sb.Append('\r');
						sb.Append('\n');
					}
					else
					{
						if (record.Count > 0 || sb.Length > 0)
						{
							record.Add(sb.ToString());
							sb.Clear();
						}

						if (record.Count > 0)
							yield return record;

						record = new List<string>(record.Count);
					}
				}
				else if (sb.Length == 0 && !inQuote)
				{
					if (readChar == qualifier)
						inQuote = true;
					else if (readChar == delimiter)
					{
						record.Add(sb.ToString());
						sb.Clear();
					}
					else if (char.IsWhiteSpace(readChar))
					{
						// Ignore leading whitespace
					}
					else
						sb.Append(readChar);
				}
				else if (readChar == delimiter)
				{
					if (inQuote)
						sb.Append(delimiter);
					else
					{
						record.Add(sb.ToString());
						sb.Clear();
					}
				}
				else if (readChar == qualifier)
				{
					if (inQuote)
					{
						if ((char)reader.Peek() == qualifier)
						{
							reader.Read();
							sb.Append(qualifier);
						}
						else
							inQuote = false;
					}
					else
						sb.Append(readChar);
				}
				else
					sb.Append(readChar);
			}

			if (record.Count > 0 || sb.Length > 0)
				record.Add(sb.ToString());

			if (record.Count > 0)
				yield return record;
		}



    }

}