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rune

The Rune Language, an embeddable dynamic programming language for Rust.

Contributing

If you want to help out, please have a look at Open Issues.

Highlights of Rune

• Runs a compact representation of the language on top of an efficient stack-based virtual machine.
• Clean Rust integration 💻.
• Multithreaded 📖 execution.
• Hot reloading 📖.
• Memory safe through reference counting 📖.
• Awesome macros 📖 and Template literals 📖.
• Try operators 📖 and Pattern matching 📖.
• Structs and enums 📖 with associated data and functions.
• Dynamic containers like vectors 📖, objects 📖, and tuples 📖 all with out-of-the-box serde support 💻.
• First-class async support 📖 with Generators 📖.
• Dynamic instance functions 📖.
• Stack isolation 📖 between function calls.

Rune scripts

You can run Rune programs with the bundled CLI:

cargo run --bin rune -- run scripts/hello_world.rn

If you want to see detailed diagnostics of your program while it’s running, you can use:

cargo run --bin rune -- run scripts/hello_world.rn --dump --trace

See --help for more information.

Running scripts from Rust

You can find more examples in the examples folder.

The following is a complete example, including rich diagnostics using termcolor. It can be made much simpler if this is not needed.

use rune::{Context, Diagnostics, Source, Sources, Vm};
use rune::termcolor::{ColorChoice, StandardStream};
use std::sync::Arc;

let context = Context::with_default_modules()?;
let runtime = Arc::new(context.runtime()?);

let mut sources = Sources::new();
sources.insert(Source::memory("pub fn add(a, b) { a + b }")?);

let mut diagnostics = Diagnostics::new();

let result = rune::prepare(&mut sources)
    .with_context(&context)
    .with_diagnostics(&mut diagnostics)
    .build();

if !diagnostics.is_empty() {
    let mut writer = StandardStream::stderr(ColorChoice::Always);
    diagnostics.emit(&mut writer, &sources)?;
}

let unit = result?;
let mut vm = Vm::new(runtime, Arc::new(unit));

let output = vm.call(["add"], (10i64, 20i64))?;
let output: i64 = rune::from_value(output)?;

println!("{}", output);