DotLang provides a full fidelity lexer, recursive descent parser, and abstract syntax tree for the Graphviz DOT Language, written in modern C# 8.0. It is available as a netstandard2.0 library.

• DotLang API Documentation

The primary goal of this project is to ultimately provide a language service for Visual Studio that provides rich syntactic and semantic analysis of Graphviz DOT files: syntax highlighting, semantic completion, and Quick Info tooltips.

To support this goal, the lexer and parser are written with inspiration from Roslyn: nothing is ever discarded, and the produced AST can be run through a SyntaxVisitor to produce output DOT source code that is identical to its input.

Notably, DotLang does not aspire to actually render Graphviz graphs. There are plenty of tools for this already.

DotLang is a .NET Standard 2.0 project and can be built with the latest stable Visual Studio, Visual Studio for Mac, or the .NET Core toolchain.

• dotnet build
• dotnet test
• dotnet pack
• dotnet msbuild /t:UpdateDocs

• Actual diagnostics
  • Currently the parser just throws/bails
• Language service
  • Would be awesome to leverage XML/HTML projection buffers for XmlLiteralToken