Website | Source

Gravity is a powerful, dynamically typed, lightweight, embeddable programming language written in C without any external dependencies (except for stdlib). It is a class-based concurrent scripting language with modern Swift-like syntax.

Gravity supports procedural programming, object-oriented programming, functional programming, and data-driven programming. Thanks to special built-in methods, it can also be used as a prototype-based programming language.

Gravity has been developed from scratch ... in order to offer an easy way to write portable code for the iOS and Android platforms. It is written in portable C code that can be compiled on any platform using a C99 compiler. The VM code is about 4K lines long, the multipass compiler code is about 7K lines and the shared code is about 3K lines long. The compiler and virtual machine combined add less than 200KB to the executable on a 64-bit system.


class Vector {
    // instance variables
    var x = 0;
    var y = 0;
    var z = 0;

    // constructor
    func init (a = 0, b = 0, c = 0) {
        x = a; y = b; z = c;

    // instance method (built-in operator overriding)
    func + (v) {
        if (v is Int) return Vector(x+v, y+v, z+v);
        else if (v is Vector) return Vector(x+v.x, y+v.y, z+v.z);
        return null;

    // instance method (built-in String conversion overriding)
    func String() {
        // string interpolation support
        return "[\(x),\(y),\(z)]";

func main() {
    // initialize a new vector object
    var v1 = Vector(1,2,3);

    // initialize a new vector object
    var v2 = Vector(4,5,6);

    // call + function in the vector object
    var v3 = v1 + v2;

    // returns string "[1,2,3] + [4,5,6] = [5,7,9]"
    return "\(v1) + \(v2) = \(v3)";

Tags: language   native   dynamic  

Last modified 06 April 2022