🐕 Ein

Ein is a simple, dynamically-typed programming language, inspired by Rust (in which the interpreter is written), Lua and Wren.

Status

Extremely, extremely work-in-progress - I'm developing this project following the exercises in Bob Nystrom's wonderful Crafting Interpreters book. Hopefully something interesting and/or vaguely usable will come out of it!

Example

fn sayHello(name) {
    return "Hello, " + name + "!";
}

let greeting = sayHello("Ein");

print(greeting);

The above syntax is subject to change - I'll try to keep it in sync with the latest version of the code!

Project Structure

This project is made up of several Rust crates:

Crate	Description
ein	The top level crate, containing a command line interface and REPL.
ein_syntax	Contains a hand-written lexer and LALRPOP-generated parser for the language's syntax.
ein_treewalk	A simple tree-walking interpreter. Probably not very performant, but easy to hack on!