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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
💻 . - Memory safe through reference counting
📖 . - Awesome macros
📖 . - Template literals
📖 . - Try operators
📖 . - Pattern matching
📖 . - Structs and enums
📖 with associated data and functions. - Dynamic vectors
📖 , objects📖 , and tuples📖 with out-of-the-box serde support💻 . - First-class async support
📖 . - 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-unit --trace --dump-vm
See --help for more information.
Running scripts from Rust
You can find more examples in the
examplesfolder.
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;
#[tokio::main]
async fn main() -> rune::Result<()> {
let context = Context::with_default_modules()?;
let runtime = Arc::new(context.runtime());
let mut sources = Sources::new();
sources.insert(Source::new(
"script",
r#"
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);
Ok(())
}