Rhai

lastmod 2025-09-20created 2025-09-201 edits

Embedded scripting language for Rust

About

Scripting language and execution engine that can be easily embedded in Rust applications
Designed to add dynamic logic through external scripts or to build custom DSLs
Highly compatible with Rust, with an architecture that considers performance, security, and extensibility
Runs on all Rust-supported platforms (WASM, no-std) with Rust 1.66.0+ or later
Syntax is a dynamically typed language similar to JavaScript + Rust
Performance: 0.14 seconds for 1 million iterations on a single-core 2.6GHz Linux VM
Native Rust integration: supports Rust functions, types, getters/setters, methods, and indexers
Rust values can be passed to scripts as variables/constants (using Scope)
Supports major data types: booleans, integers, floating point, Decimal, strings, Unicode characters, arrays, byte arrays, object maps
Functions defined in Rhai scripts can be called from Rust
Minimal dependencies (uses only a few libraries such as smallvec, thin-vec)
Re-entrant engine: Send + Sync possible via sync
Provides AST compilation and optimization
Supports a plugin system and macro-based API extension
Partial support for function/operator overloading, function pointers, currying, closures, and OOP patterns
Provides a module system; the codebase can be composed dynamically
serde serialization/deserialization support (optional)
Provides a debugging interface

Don’t Panic guarantee: a panic is considered a bug; the host system stays safe
Sandboxed execution: cannot change the external environment unless explicitly allowed
Protection against malicious attacks: blocks stack overflows, oversized data, and runaway execution
Execution progress can be tracked and terminated manually
Passes Miri checks

author Zer0 sitemap