Lyron

A simple dynamically typed (with type annotations), lightweight programming language designed to be simple and clear. Your feedback and contributions are welcome!

Installation

1. Clone the repo

   git clone https://github.com/re-masashi/lyron.git
   cd lyron

2. Build Lyron

   cargo build --release

   or, if you want to have GxHash (a faster hashmap implementation) enabled.

   RUSTFLAGS="-C target-cpu=native" cargo build --release --features gxhash

---

Quickstart

Create hello.ly:

# hello.ly
print("Hello, Lyron!")

Run it:

lyron hello.ly
# → Hello, Lyron!

---

Syntax

• Functions:

  • Defining a function

    def sum(a:i32, b:i32) -> i32
        a+b
    end 
    

  • Calling a function

    sum(a, b)
    

• Class

  • A class in lyron is just a collection of functions and attributes
  • Constructors should have the same name as the class. Eg:

    class Animal{
        def Animal(self: Self, age: i32)->Animal do
            print("i'm an animal ")
            print("i'm "+age+" years old.")
            self = setattr(self, "age", age) # `self.age = age` is invalid!
            self
        end
    
        def sound(self: Self) -> Animal
            print("i make a sound")
    }
    

• Variables:

  • Declaration:

    let x: i32    
    

  • Assignment:

    x = 42 
    

  Note: Both need to be done separately.

• Operations

  • Available operations =, +, -, *, /, ==, !=, <, >, <=, >=, +=, -=, *=, /=

    let a: i32 = (-b + 5) - 10 / -(5 - -2)
    

• Comments

  • Comments start with # and continue until the end of the line

    # this is a comment
    

• Programs

  • A program consists of just top-level functions, classes, and expressions.

Contributing

1. Fork the repo
2. Create a branch: git checkout -b feature/YourFeature
3. Make your changes & add tests
4. Submit a PR against main

Roadmap

• Core parser improvements (better errors, etc)
• ?Standard library: collections, I/O
• Module system
• Package Manager
• Performance Improvements (make it 4x faster than now, 9th April 2025)

Note: ? indicates half-done stuff

License

MIT © Masashi