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Programming Languages Rhai - Embedded Scripting for Rust No.627bca167e84024c6ea07392 Sticky Alternative URL

NiQin updated at 2022-05-11 22:37:10+08:00

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Keys/tags: rust rhai embedded-scripting 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.

Targets and builds

  • All CPU and O/S targets supported by Rust, including:
    • WebAssembly (WASM)
    • no-std
  • Minimum Rust version 1.57

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 (including packed byte arrays) and object maps.
  • Easily call a script-defined function from Rust.
  • Relatively little unsafe code (yes there are some for performance reasons).
  • Few dependencies - currently only smallvec, num-traits, ahash, bitflags and smartstring.
  • Re-entrant scripting engine can be made Send + Sync (via the sync 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.
  • A debugging interface.

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.
  • Passes Miri.

For those who actually want their own language

  • Use as a DSL.
  • Disable certain language features such as looping.
  • Further restrict the language by surgically disabling keywords and operators.
  • Define custom operators.
  • Extend the language with custom syntax.
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