using System;

using System.Text;

using System.Collections.Generic;

using Sprache;

​

public class Program

{

    public static void Main()

    {

        var stringParser = BuildStringLiteralParser('\"').Or(BuildStringLiteralParser('\''));

        var str1 = stringParser.Parse("\"'Hello' \\\"John\\\"\"");

        str1.Dump();

        var str2 = stringParser.Parse("\'\\'Hello\\' \"John\"\'");

        str2.Dump();

    }

​

    private static readonly StringBuilder _reusableStringBuilder = new StringBuilder();

    private static Parser<string> BuildStringLiteralParser(char delimiterChar)

    {

        var escapeChar = '\\';

        var delimiter = Sprache.Parse.Char(delimiterChar);

        var escape = Sprache.Parse.Char(escapeChar);

        var escapedDelimiter = Sprache.Parse.String($"{escapeChar}{delimiterChar}");

        var splitByEscape = Sprache.Parse.AnyChar.Except(delimiter.Or(escape)).Many().Text().DelimitedBy(escapedDelimiter);

        string BuildStr(IEnumerable<IEnumerable<string>> splittedByEscape)

        {

            _reusableStringBuilder.Clear();

            var i = 0;

            foreach (var splittedByEscapedDelimiter in splittedByEscape)

            {

                if (i > 0)

                {

                    _reusableStringBuilder.Append(escapeChar);

                }

​

                var j = 0;

                foreach (var str in splittedByEscapedDelimiter)

                {

                    if (j > 0)

                    {

                        _reusableStringBuilder.Append(delimiterChar);

                    }

​

                    _reusableStringBuilder.Append(str);

                    j++;

                }

​

                i++;

            }

​

            return _reusableStringBuilder.ToString();

        }

​

        return (

            from ln in delimiter

            from splittedByEscape in splitByEscape.DelimitedBy(escape)from rn in delimiter

            select BuildStr(splittedByEscape)).Named("string");

    }

}