Poly is an innovative polyglot macro system designed to facilitate type-safe cross-language programming in Rust without any external dependencies. With Poly, developers can leverage multiple programming languages while maintaining the performance and safety characteristics inherent to Rust.

Key Features

• Cross-Language Programming: Write code in JavaScript, TypeScript, and Python seamlessly within Rust using embedded interpreters.
• Zero External Dependencies: No need for external runtimes like Python or Node.js—everything runs in pure Rust.
• Type Safety: Enjoy compile-time checking across different languages, ensuring greater reliability in code integration and execution.

Quick Start

Here's how you can use Poly to perform simple operations across multiple languages:

use polyglot_macros::{js, py, ts};

fn main() {
    // JavaScript (using Boa engine, purely in Rust)
    let sum: i32 = js!{ [1,2,3].reduce((a,b) => a+b, 0) };
    
    // TypeScript (using SWC + Boa, all in Rust)
    let typed: i32 = ts!{ const x: number = 5; x * 2 };
    
    // Python scripting (using Rhai, also in Rust)
    let result: i32 = py!{ let x = 10; x * 2 };
    
    println!("{sum}, {typed}, {result}");  // Output: 6, 10, 20
}

Macro and Engine Status

Type-Safe FFI Bridge

Develop type-safe interfaces for external languages:

use polyglot_macros::poly_bridge;

#[poly_bridge(javascript)]
trait Calculator {
    fn add(&self, a: i32, b: i32) -> i32;
}
// Automatically generates JsCalculator with type-checked methods.

The .poly Format

Poly allows for multi-language source files using the .poly extension:

// main.poly

import numpy as np  // Python imports

rust {
    let data = vec![1, 2, 3, 4, 5];
    let doubled = py!{ (np.array(data) * 2).tolist() };
}

python {
    def process(data):
        return [x * 2 for x in data]
}

javascript {
    const render = (data) => console.log(data);
}

Compile with:

polyglot compile main.poly --target wasm
polyglot watch main.poly  # Enables hot reloading

Documentation

For comprehensive guidance, refer to the following:

• Language Spec
• API Reference
• Architecture Overview

Running Examples

To explore Poly, run:

cargo run --example poly_runtime_demo

Building the Project

Compile the project with:

cargo build -p polyglot-macros -p polyglot-runtime

Philosophy

Poly adheres to several core principles:

• Keep it Simple: Example of simplicity: let x: i32 = js!{ 1 + 2 };
• Facilitate Complexity: Support for complex use cases via #[poly_bridge(javascript)].
• Dependability: All interpreters operate within Rust, ensuring performance and reducing integration complexity.
• Ensuring Safety: Comprehensive compile-time checks across language interfaces.