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A runtime for Ohua in Rust.
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README.md

Ohua for Rust

ohua-rust-runtime

This is a Rust-based implementation of the Ohua Runtime.

Project Structure

The project is split into two modules, ohua_codegen and ohua_runtime. The codegen module forms the backend of the Ohua compiler infrastructure and generates the code necessary to integrate an algorithm in native Rust code. Some recurring functionality and types used throughout the generated code have been bundled into the ohua_runtime module.

Getting Started

The ohuac compiler

cargo and the libraries in this repository only provide the backend for Ohua. So, you will additionally need to have ohuac, the standalone compiler, installed. Please follow the installation instructions in the repository.

Due to the fact, that we are still heavily developing both this runtime and the compiler, use master branch versions of both to make sure the tools are interoperable.

The ohauc binary will automatically be invoked by rustc, so you don't have to familiarize yourself with its usage.

Using the right toolchain

Due to the fact, that the backend uses unstable features such as fnbox, Ohua can currently only be used in nightly Rust. When using rustup, you can simply run

rustup override set nightly

in your project root.

Using Ohua in your project

Add Ohua to your project's dependencies:

[dependencies]
ohua_codegen = { git = "https://github.com/ohua-dev/ohua-rust-runtime" }
ohua_runtime = { git = "https://github.com/ohua-dev/ohua-rust-runtime" }

Then, specify the necessary feature flags in your projects' main.rs or lib.rs. Also, don't forget the extern crate specification, if you are using the 2015 edition.

#![feature(proc_macro_hygiene, fnbox)]

Now you are good to go! Wherever you want to use an Ohua algorithm in your code, import the macro and link your algorithm file! Assuming, you have an algorithm file saved at src/foo/bar.ohuac and want to use this in src/foo/mod.rs, you would write:

use ohua_codegen::ohua; // the codegen macro

fn something() {
    // This invokes the algorithm with no arguments, expecting no return value.
    #[ohua]
    foo::bar();

    // You can take arguments and return values, too!
    #[ohua]
    let result = foo::bar(some_var, 42);
}

Note that the algorithm is always invoked by specifying the complete path, separated by double-colons and omitting the .ohuac file extension.

For a complete example, you can have a look at the example folder or the testcases.

Testing

Ohua's Rust backend comes with a variety of tests that are designed to verify the correct operation of Ohua's core functionalities.

To run the tests, simply switch into the testcases folder and fire up cargo test. Any failing tests have to be de-activated using the unimplemented! macro, since errors during code generation will force the whole test run to come to a stop.

Documentation

A documentation for the project can be obtained by running

RUSTDOCFLAGS="--document-private-items" cargo doc

in the respective libraries or by reading the docs inline. Please note that this project is still under heavy development and the documentation might be outdated.

Caveats

Although Ohua algorithms can be defined in many dialects, only ohuac files, which use Rust-like syntax, are currently supported.

License

This project is licensed under the Eclipse Public License version 1.0. For further information please refer to the LICENSE file.

The Rust Logo is trademark of the Rust programming language.

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