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rhai-1.18.0
Rhai - embedded scripting for Rust
Rhai is a tiny, simple and fast embedded scripting language for Rust that gives you a safe and easy way to add scripting to your applications. It provides a familiar syntax based on JavaScript and Rust and a simple Rust interface. Here is a quick example.
First, the contents of my_script.rhai
:
// Brute force factorial function
fn factorial(x) {
if x == 1 { return 1; }
x * factorial(x - 1)
}
// Calling an external function 'compute'
compute(factorial(10))
And the Rust part:
use rhai::{Engine, EvalAltResult, RegisterFn};
fn main() -> Result<(), Box<EvalAltResult>>
{
// Define external function
fn compute_something(x: i64) -> bool {
(x % 40) == 0
}
// Create scripting engine
let mut engine = Engine::new();
// Register external function as 'compute'
engine.register_fn("compute", compute_something);
# #[cfg(not(feature = "no_std"))]
# #[cfg(not(target_arch = "wasm32"))]
assert_eq!(
// Evaluate the script, expects a 'bool' return
engine.eval_file::<bool>("my_script.rhai".into())?,
true
);
Ok(())
}
Documentation
See The Rhai Book for details on the Rhai script engine and language.