Project set up following C# Setup section of the ANTLR Mega Tutorial. Reference to original repo at: https://github.com/unosviluppatore/antlr-mega-tutorial.
Differently from what is used in official repo, this project uses official ANTLR 4 runtime instead of antlr4cs. It requires the execution of the Java-based ANTLR tool to generate parser and lexer code:
antlr4 -Dlanguage=CSharp Spreadsheet.g4