TSV parser

using System;
using System.Text;
using System.Collections.Generic;
using System.IO;

namespace TSV
{
    public static class TSV
    {
        public static void ToString(TextWriter w, string[] inputs)
        {
            bool first = true;
            foreach(string col in inputs)
            {
                if( first )
                    first = false;
                else
                    w.Write( '\t' );

                if( col.Contains( "\"" ) || col.Contains( "\t" ) || col.Contains( "\n" ) || col.Contains( "\r" ) )
                    w.Write(string.Format( "\"{0}\"", col.Replace( "\"", "\"\"" ) ));
                else
                    w.Write( col );
            }
        }

        public static void FromString(TextReader r, out string[] ret)
        {
            List<string> list = new List<string>();
            StringBuilder sb = new StringBuilder();

            while( true )
            {
                int ic = r.Read();
                if( ic < 0 )
                    break;

                char c = (char)ic;
                switch( c )
                {
                case '\t':
                    list.Add( sb.ToString() );
                    sb.Clear();
                    break;
                case '\n': // reached end of this TSV
                    break;
                case '"':
                    // parse
                    while( true )
                    {
                        ic = r.Read();
                        if( ic < 0 )
                            break;
                        c = (char)ic;

                        if( c == '"' )
                        {
                            if( r.Peek() == '"' ) // is it escaped?
                            {
                                r.Read(); // read the 2nd quote
                                sb.Append( '"' );
                            }
                            else
                                break; // reached the end of the quote
                        }
                        else
                            sb.Append( c );
                    }

                    break;
                default:
                    sb.Append( c );
                    break;
                }
            }

            if(sb.Length != 0)
                list.Add( sb.ToString() );

            ret = list.ToArray();
        }
    }
}

namespace TSVExportImporter
{
    class MainClass
    {

        public static void Main( string[] args )
        {
            StringBuilder output = new StringBuilder();
            StringWriter w = new StringWriter(output);

            TSV.TSV.ToString( w, new[]{ "Hello,", "World!", "Complex\nNewline", "Complex\"Quote", "Complex\tTab" } );
            Console.WriteLine( "Encode:" );
            Console.WriteLine( output.ToString() );

            StringReader r = new StringReader( output.ToString() );
            string[] result;
            TSV.TSV.FromString( r, out result );

            Console.WriteLine( "Decode:" );
            foreach( string elm in result )
                Console.WriteLine( elm );
        }
    }
}