This package includes GPPG and GPLEX tools for compiling YACC and LEX source files in your C# project.
After installing this package, just type "Add-Parser MyLanguage" into Package Manager Console to add a new parser in your project and then Build. For a working example type "Add-CalculatorExample".
Take a look at this post for further informations:
http://ecianciotta-en.abriom.com/2013/08/yacclex-tools-v02.html