Crate rune

Minimum support: Rust 1.74+.

Visit the site 🌐 — Read the book 📖

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 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);

Re-exports

• pub use self::runtime::from_value;
• pub use self::runtime::to_value;
• pub use self::runtime::FromValue;
• pub use self::runtime::ToValue;
• pub use self::runtime::Unit;
• pub use self::runtime::Value;
• pub use self::runtime::Vm;
• pub use self::source::Source;
• pub use ::codespan_reporting::term::termcolor;
  emit

Modules

• alloc
  The Rune core allocation and collections library
• ast
  Abstract syntax trees for the Rune language.
• clicli
  Helper to build customized commandline interfaces using custom rune contexts.
• compile
  The Rune compiler.
• diagnostics
  Diagnostics module for Rune.
• docdoc
  Helper to generate documentation from a context.
• languageserver
  Utility for building a language server.
• macros
  The macro system of Rune.
• module
  Types used for defining native modules.
• modules
  Public packages that can be used to provide extract functionality to virtual machines.
• no_std
  Helper prelude for #no_std support. Public types related to using rune in #no_std environments.
• parse
  Parsing utilities for Rune.
• query
  Lazy query system, used to compile and build items on demand and keep track of what’s being used and not.
• runtime
  Runtime module for Rune.
• source
  Module for dealing with sources.
• workspaceworkspace
  Types for dealing with workspaces of rune code.

Macros

• K
  Helper macro to reference a specific token kind, or short sequence of kinds.
• T
  Helper macro to reference a specific token.
• sources
  Helper macro to define a collection of sources populatedc with the given entries.
• vm_panic
  Helper to cause a panic.
• vm_try
  Helper to perform the try operation over VmResult.
• vm_write
  Helper macro to perform a write! in a context which errors with VmResult and returns VmResult<Result<_, E>> on write errors.

Structs

• Build
  High level helper for setting up a build of Rune sources into a Unit.
• BuildError
  Error raised when we failed to load sources.
• Context
  Context used for the Rune language.
• Diagnostics
  Structure to collect compilation diagnostics.
• Hash
  The primitive hash that among other things is used to reference items, types, and native functions.
• Module
  A Module that is a collection of native functions and types.
• Options
  Options that can be provided to the compiler.
• Params
  Helper to register a parameterized function.
• SourceId
  The opaque identifier of a source file, as returned by Sources::insert.
• Sources
  A collection of source files.

Enums

• ContextError
  An error raised when building the context.

Traits

• Any
  A trait which can be stored inside of an AnyObj.
• ToTypeHash
  Helper trait used to convert a type into a type hash.

Functions

• prepare
  Entry point to building Sources of Rune using the default unit storage.

Attribute Macros

• function
  Macro used to annotate native functions which can be loaded into rune.
• module
  Macro used to annotate a module with metadata.

Derive Macros

• Any
• FromValue
• ToValue