Boa

This is an experimental Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.

Live Demo (WASM)

https://jasonwilliams.github.io/boa/

You can get more verbose errors when running from the command line

Benchmarks

https://jasonwilliams.github.io/boa/dev/bench/

Contributing

If you don't already have Rust installed rustup is the recommended tool to use. It will install Rust and allow you to switch between nightly, stable and beta. You can also install additional components.

curl https://sh.rustup.rs -sSf | sh

Then simply clone this project and cargo build inside the directory.

VSCode

Plugins

Either the Rust (RLS) or the Rust Analyzer extension is preferred. RLS is easier to set up but most of the development is moving towards Rust Analyzer. Both of these plugins will help you with your Rust Development

Tasks

There are some pre-defined tasks in tasks.json

• Build - shift+cmd/ctrl+b should build and run cargo. You should be able to make changes and run this task.
• Test - (there is no shortcut, you'll need to make one) - Runs Cargo Test. I personally set a shortcut of shift+cmd+option+T (or shift+ctrl+alt+T)

If you don't want to install everything on your machine, you can use the Dockerfile. Start VSCode in container mode (you may need the docker container plugin) and use the Dockerfile.

Debugging

See Debugging

Web Assembly

This interpreter can be exposed to javascript! You can build the example locally with:

$ yarn install
$ yarn serve

In the console you can use window.evaluate to pass JavaScript in To develop on the web assembly side you can run yarn serve then go to http://localhost:8080

Roadmap

See Milestones

Changelog

see CHANGELOG

Usage

• Clone this repo
• Run with cargo run -- test.js where test.js is an existing JS file
• If any JS doesn't work then it's a bug. Please raise an issue!

Command-line Options

USAGE:
    boa_cli [OPTIONS] [FILE]...

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -a, --dump-ast <FORMAT>       Dump the ast to stdout with the given format [possible values: Debug, Json,
                                  JsonPretty]
    -t, --dump-tokens <FORMAT>    Dump the token stream to stdout with the given format [possible values: Debug, Json,
                                  JsonPretty]

ARGS:
    <FILE>...    The JavaScript file(s) to be evaluated

Communication

Feel free to contact us on Discord https://discord.gg/tUFFk9Y

Example

License

This project is licensed under the Unlicense or MIT licenses, at your option.