okira-e / lox-rs

The Lox Programming Language Interpreter from the amazing book Crafting Interpreters by Robert Nystrom implemented in Rust.

The Lox Programming Language in Rust

This repository provides an implementation of the Lox programming language in Rust, following the guidance from the "Crafting Interpreters" book by Robert Nystrom. Lox is a dynamically-typed, object-oriented programming language that is simple to understand, making it an excellent language for learning about language design and implementation.

Introduction

Lox is a high-level programming language that supports features such as variables, control flow, functions, classes, and more. It's designed to be a straightforward language for learning about language design and crafting an interpreter. This implementation follows the principles outlined in the "Crafting Interpreters" book, which provides detailed insights into creating a Lox interpreter in two main stages: a tree-walking interpreter and a bytecode compiler.

if condition {
    print("yes");
} else {
    print("no");
}

var a = 1;
for a < 10 {
    print(a);
    a = a + 1;
}

for var a = 1; a < 10; a = a + 1 {
    print(a);
}

func printSum(a, b) {
    print(a + b);
}

class Breakfast {
    cook() {
        print("Eggs a-fryin'!");
    }

    serve(who) {
        print("Enjoy your breakfast, " + who + ".");
    }
}

Current State

Features implemented so far include: variable declaration, variable resolution, printing, and if statements.

A working example can be found here: ./code/dev.lox

Getting Started

To get started, clone this repository and run the following command:

cargo build --release

This will build the Lox interpreter in release mode, which will be located at target/release/lox. You can then run the interpreter with a Lox script as an argument:

target/release/lox code.lox

or you can run the interpreter in REPL mode (interactive mode):

target/release/lox