A Lua based embeddable scripting language for the dotnet standard
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This repository contains two closely alligned projects: Lua for dotnet, and Regolith

The first is to implement Lua 5.3 in dotnet and provide tools and packages for it to be used in or as dotnet projects, with support for importing dotnet libraries using require, using Lua's : operator to pipe to instance methods and extension methods, and treating Lua iterators as IEnumerable<dynamic> to allow for direct use of Linq extension methods. This is intended as a 'learning step' in the development of Regolith, and is not intended as a long term, maintained way of adding Lua scripting functionality to dotnet programs.

The second project is a new language called Regolith that is inspired by Lua, Typescript, and F#.

Regolith Features:

  • Keep dotnet interopability of the Lua project
  • Static type system
    • Interface style type definitions
    • Type unions and intersections
  • Fully featured pipes
    • : will always just move the value on its left to the first parameter of the function call on the right
    • instance methods and extension methods take 'self' as first parameter, so instances are piped to the call
  • optional immutability
    • constant and local constant
    • function parameters can be marked constant to disallow assignments or calling impure methods on the parameter
  • optionaly pure functions
    • disallow access to global or parent scopes and marks parameters as constant to guarantee lack of side effects
    • example: local pure function theFuture(Timer timer, number seconds) -> number return timer.now() + seconds end
  • partial function application
    • calling functions without all parameters returns a new function that takes the remaining parameters


They key motivator of adding static typing to Lua is to enable a rich set of features that will improve Lua's portability, scalability, and accesability.

  • Portability: With AST generation and static typing the ability to create a diverse set of compilation and transpilation tools emerges
    • WASM?! ARM?! Shaders?! C transpilation?! JavaScript transpilation?! Yes please
  • Scalability: Strong compile time knowledge of code will allow for tools that enable easy maintainence of large code bases
    • -> go to definition <-
  • Accesability: Compile time code knowledge and development with accesability in mind from the start will enable a wide range of beginner-friendly features
    • Advanced debugging with forward-and-back stepping
    • Syntax tree visualizations
    • Relevant tips and refactorings
    • Runtime state visualizations and history