94 lines
5.8 KiB
Markdown
94 lines
5.8 KiB
Markdown
Rhai - Embedded Scripting for Rust
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=================================
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[](https://github.com/jonathandturner/rhai/actions)
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[](https://github.com/license/jonathandturner/rhai)
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[](https://crates.io/crates/rhai/)
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[](https://crates.io/crates/rhai/)
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[](https://docs.rs/rhai/)
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[](https://discord.gg/HquqbYFcZ9)
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[](https://www.reddit.com/r/Rhai)
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Rhai is an embedded scripting language and evaluation engine for Rust that gives a safe and easy way
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to add scripting to any application.
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Supported targets and builds
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---------------------------
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* All common CPU targets for Windows, Linux and MacOS.
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* WebAssembly (WASM)
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* `no-std`
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* Minimum Rust version 1.45
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Standard features
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-----------------
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* Easy-to-use language similar to JavaScript+Rust with dynamic typing.
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* Fairly low compile-time overhead.
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* Fairly efficient evaluation (1 million iterations in 0.3 sec on a single core, 2.3 GHz Linux VM).
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* Tight integration with native Rust [functions](https://schungx.github.io/rhai/rust/functions.html) and [types]([#custom-types-and-methods](https://schungx.github.io/rhai/rust/custom.html)), including [getters/setters](https://schungx.github.io/rhai/rust/getters-setters.html), [methods](https://schungx.github.io/rhai/rust/custom.html) and [indexers](https://schungx.github.io/rhai/rust/indexers.html).
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* Freely pass Rust variables/constants into a script via an external [`Scope`](https://schungx.github.io/rhai/rust/scope.html) - all clonable Rust types are supported; no need to implement any special trait.
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* Easily [call a script-defined function](https://schungx.github.io/rhai/engine/call-fn.html) from Rust.
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* Relatively little `unsafe` code (yes there are some for performance reasons).
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* Few dependencies (currently only [`smallvec`](https://crates.io/crates/smallvec)).
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* Re-entrant scripting engine can be made `Send + Sync` (via the `sync` feature).
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* Scripts are [optimized](https://schungx.github.io/rhai/engine/optimize.html) (useful for template-based machine-generated scripts) for repeated evaluations.
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* Easy custom API development via [plugins](https://schungx.github.io/rhai/plugins/index.html) system powered by procedural macros.
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* [Function overloading](https://schungx.github.io/rhai/language/overload.html) and [operator overloading](https://schungx.github.io/rhai/rust/operators.html).
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* Dynamic dispatch via [function pointers](https://schungx.github.io/rhai/language/fn-ptr.html) with additional support for [currying](https://schungx.github.io/rhai/language/fn-curry.html).
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* [Closures](https://schungx.github.io/rhai/language/fn-closure.html) (anonymous functions) that can capture shared values.
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* Some syntactic support for [object-oriented programming (OOP)](https://schungx.github.io/rhai/language/oop.html).
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* Organize code base with dynamically-loadable [modules](https://schungx.github.io/rhai/language/modules.html).
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* Serialization/deserialization support via [serde](https://crates.io/crates/serde) (requires the `serde` feature).
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* Support for [minimal builds](https://schungx.github.io/rhai/start/builds/minimal.html) by excluding unneeded language [features](https://schungx.github.io/rhai/start/features.html).
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Protected against attacks
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-------------------------
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* Sand-boxed - the scripting engine, if declared immutable, cannot mutate the containing environment unless [explicitly permitted](https://schungx.github.io/rhai/patterns/control.html).
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* Rugged - protected against malicious attacks (such as [stack-overflow](https://schungx.github.io/rhai/safety/max-call-stack.html), [over-sized data](https://schungx.github.io/rhai/safety/max-string-size.html), and [runaway scripts](https://schungx.github.io/rhai/safety/max-operations.html) etc.) that may come from untrusted third-party user-land scripts.
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* Track script evaluation [progress](https://schungx.github.io/rhai/safety/progress.html) and manually terminate a script run.
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For those who actually want their own language
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---------------------------------------------
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* Use as a [DSL](https://schungx.github.io/rhai/engine/dsl.html).
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* Restrict the language by surgically [disabling keywords and operators](https://schungx.github.io/rhai/engine/disable.html).
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* Define [custom operators](https://schungx.github.io/rhai/engine/custom-op.html).
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* Extend the language with [custom syntax](https://schungx.github.io/rhai/engine/custom-syntax.html).
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Documentation
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-------------
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See [The Rhai Book](https://schungx.github.io/rhai) for details on the Rhai scripting engine and language.
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To build _The Book_, first install [`mdbook`](https://github.com/rust-lang/mdBook)
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and [`mdbook-tera`](https://github.com/avitex/mdbook-tera) (for templating).
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Running `mdbook build` builds it.
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Playground
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----------
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An [Online Playground](https://alvinhochun.github.io/rhai-demo/) is available with syntax-highlighting editor.
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Scripts can be evaluated directly from the editor.
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License
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-------
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Licensed under either of the following, at your choice:
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* [Apache License, Version 2.0](https://github.com/jonathandturner/rhai/blob/master/LICENSE-APACHE.txt), or
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* [MIT license](https://github.com/jonathandturner/rhai/blob/master/LICENSE-MIT.txt)
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Unless explicitly stated otherwise, any contribution intentionally submitted
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for inclusion in this crate, as defined in the Apache-2.0 license, shall
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be dual-licensed as above, without any additional terms or conditions.
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