f7d523e983
Fix hanging when parsing unterminated statements block. |
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.github/workflows | ||
benches | ||
codegen | ||
examples | ||
no_std/no_std_test | ||
scripts | ||
src | ||
tests | ||
.gitignore | ||
Cargo.toml | ||
CHANGELOG.md | ||
LICENSE-APACHE.txt | ||
LICENSE-MIT.txt | ||
README.md |
Rhai - Embedded Scripting for Rust
Rhai is an embedded scripting language and evaluation engine for Rust that gives a safe and easy way to add scripting to any application.
Supported targets and builds
- All common CPU targets for Windows, Linux and MacOS.
- WebAssembly (WASM)
no-std
- Minimum Rust version 1.49
Standard features
- Simple language similar to JavaScript+Rust with dynamic typing.
- Fairly efficient evaluation (1 million iterations in 0.3 sec on a single-core, 2.3 GHz Linux VM).
- Tight integration with native Rust functions and types, including getters/setters, methods and indexers.
- Freely pass Rust values into a script as variables/constants via an external
Scope
- all clonable Rust types are supported; no need to implement any special trait. Or tap directly into the variable resolution process. - Built-in support for most common data types including booleans, integers, floating-point numbers (including
Decimal
), strings, Unicode characters, arrays and object maps. - Easily call a script-defined function from Rust.
- Relatively little
unsafe
code (yes there are some for performance reasons), andunsafe
code is only used for type casting, never to get around the borrow checker. - Few dependencies - currently only
smallvec
,num-traits
,ahash
andsmartstring
. - Re-entrant scripting engine can be made
Send + Sync
(via thesync
feature). - Compile once to AST form for repeated evaluations.
- Scripts are optimized (useful for template-based machine-generated scripts).
- Easy custom API development via plugins system powered by procedural macros.
- Function overloading and operator overloading.
- Dynamic dispatch via function pointers with additional support for currying.
- Closures (anonymous functions) that can capture shared values.
- Some syntactic support for object-oriented programming (OOP).
- Organize code base with dynamically-loadable modules, optionally overriding the resolution process.
- Serialization/deserialization support via serde (requires the
serde
feature). - Support for minimal builds by excluding unneeded language features.
Protected against attacks
- Don't Panic guarantee - Any panic is a bug. Rhai subscribes to the motto that a library should never panic the host system, and is coded with this in mind.
- Sand-boxed - the scripting engine, if declared immutable, cannot mutate the containing environment unless explicitly permitted.
- Rugged - protected against malicious attacks (such as stack-overflow, over-sized data, and runaway scripts etc.) that may come from untrusted third-party user-land scripts.
- Track script evaluation progress and manually terminate a script run.
For those who actually want their own language
- Use as a DSL.
- Restrict the language by surgically disabling keywords and operators.
- Define custom operators.
- Extend the language with custom syntax.
Project Site
Documentation
See The Rhai Book for details on the Rhai scripting engine and language.
Playground
An Online Playground is available with syntax-highlighting editor, powered by WebAssembly.
Scripts can be evaluated directly from the editor.
License
Licensed under either of the following, at your choice:
Unless explicitly stated otherwise, any contribution intentionally submitted for inclusion in this crate, as defined in the Apache-2.0 license, shall be dual-licensed as above, without any additional terms or conditions.