Equinox: A Forth Programming Language Targeting Lua

Equinox is an innovative implementation of the Forth programming language designed to compile directly to optimized Lua source code. With its unique modeless approach, Equinox eliminates the complexities of interpretation modes and return stacks, making it an efficient choice for developers.

Key Features

• Optimized Compilation: Equinox compiles directly to Lua source code, ensuring high performance.
• Modeless Design: Operates without layered interpretation, offering a streamlined programming experience.
• Enhanced Lua Integration: Supports Lua tables and arrays while addressing the issues of accidental global variable creation.
• Game Development Support: Tailored for game developers using popular frameworks like Love2D and TIC-80.
• Self-hosted Compiler (Planned): Future updates will introduce enhancements that allow users to compile within Equinox itself.

Example Usage

Equinox allows users to write compact and powerful code. For instance, here’s how to define and use a Fibonacci function:

: fibonacci ( n -- .. ) 0 1 rot 0 do 2dup + loop ;
10 fibonacci .s

Getting Started

To begin using Equinox, start the REPL and load the built-in tutorial:

$ equinox
load-file tutorial

Comparison with Traditional Forth Languages

Equinox introduces several modern features that enhance usability:

• Leverages Lua’s table structure for both arrays and dictionaries.
• Utilizes ! (put) and @ (at) for accessing and modifying tables, simplifying syntax.
• Enables control structures like if and loops outside of word definitions, enhancing code clarity.
• Implements safer loop semantics and string literals within the language syntax.

Why Choose Equinox?

Equinox combines the lightweight capabilities of Lua with the nostalgic programming style of Forth, making it a fitting choice for retro game development. The distinct separation of sequential tables and hash maps enhances code readability, while the prevention of accidental globals resolves a common pain point in Lua programming.

Though Equinox might present a learning curve for those unfamiliar with postfix notation and stack management, it facilitates a deeper understanding of programming principles by emphasizing simplicity and modular design.

Documentation

For further information and in-depth guides, refer to the documentation:

• Core
• Variables
• Lua Interop
• Table Operations
• Modules & Objects
• Catalogue

Explore Equinox and discover how to bring the charm of Forth programming to Lua applications!