baba-lang

Yet another programming language, made in Python. Has nothing to do with the video game "Baba is You".

Right now in version 0.5.1-testing.

Notes

• baba-lang is now in its 0.x versions. This means that later versions of baba-lang is not guaranteed to be backward compatible with the previous ones.
• baba-lang is written for educational purposes only; it is not meant to be used in production.

How to install and use baba-lang

Installing and running baba-lang is simple:

1. Prerequisites: Python 3 (At least 3.12 can be sure to work), Lark (see requirements.txt).
2. Either:

• Download the latest point release on GitHub (recommended, as it is stable)
• Clone the repository

git clone https://github.com/dangduomg/baba-lang.git

3. Set working directory to the project root.

cd baba-lang

4. (Optionally) Create and activate a virtual environment.

python3 -m venv .venv
source .venv/bin/activate

5. Install requirements.

pip install -r requirements.txt

6. Run src/main.py without arguments to open an interactive prompt. To run a source file, enter src/main.py <file>. Source files are of extension .bl. Run src/main.py -h for further help.

Features

• Familiar JS-like syntax
• First-class functions
• Classes with inheritance
• Exceptions
• Modules
• Easy Python interop with py_function and py_method

Example

Here is an example snippet that demonstrates most of baba-lang's features:

class Random {
    MULTIPLIER = 1103515245;
    CONSTANT = 12345;
    BITS = 31;

    fun __init__(seed) {
        this.seed = seed;
        this.state = this.seed;
    }

    fun next() {
        this.state = (
            this.MULTIPLIER * this.state + this.CONSTANT & (1 << this.BITS) - 1
        );
        return this.state;
    }

    fun __str__() {
        return '<pseudorandom number generator with seed '
             + to_string(this.seed)
             + '>';
    }
}

seed = to_int(input('seed: '));
random = new Random(seed);
print("Random number generator: " + to_string(random));
print('\nthe first 5 random numbers are:');
for (i = 0; i < 5; i += 1) {
    print(random.next());
}

To-do list

• A bytecode interpreter in Rust (compiler will still be written in Python)
• More tests
• Rest and keyword arguments
• Traits/mixins
• Algebraic data types
• import instead of include
• Static/Gradual type checking
• Package manager