Language Reference

See docs/lx-language-ref.md for the full specification. Examples and test scripts live in DotNetLxInterpreter/LxScripts.

Feature	Notes
Types	Numbers, strings, booleans, nil; truthy semantics
Functions	First-class, lexical closures, strict arity
Control Flow	if/else, while, for (desugared), break, return
Classes	Methods, properties (getter blocks), static methods
Inheritance	Single inheritance with super method dispatch
Built-ins	print() and clock() native functions
Analyzer	Unused vars, invalid break, return, this, super

DotNetLx

DotNetLx is a C# interpreter for Lx, a compact dynamic language built as part of a Crafting Interpreters-style exploration. Reference: https://craftinginterpreters.com/

This repo implements Part 2 of the book in .NET. All challenges through Chapter 13 are completed.

Key implementation details:

• Frontend is a hand-written scanner and recursive descent parser with the grammar in DotNetLxInterpreter/FrontEnd/language.grammar.
• Middle ground is a static analyzer that resolves lexical scope, enforces control-flow rules, and reports unused locals.
• Runtime is a tree-walking interpreter with environments, closures, and a small native surface (clock).
• Classes are implemented with instances, bound methods, properties as zero-arg getters, and a metaclass for statics.

TODO:

• import data from files (:import <filename.lx> in console and probably a history of commands I've run);
• Support inner for inverted class hierarchies.
• Sugar syntax for each loops (via iterator).
• Protocol class properties like:
  • toString for custom stringification in print() and string concatenation.
  • iterator for custom iteration in each loops.