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jonathandturner 2016-03-03 11:08:46 -05:00
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README.md
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@ -68,10 +68,15 @@ print(add(2, 3))
# Example 1: Hello world # Example 1: Hello world
```Rust ```Rust
let mut engine = Engine::new(); extern crate rhai;
use rhai::Engine;
if let Ok(result) = engine.eval("40 + 2".to_string()).unwrap().downcast::<i32>() { fn main() {
let mut engine = Engine::new();
if let Ok(result) = engine.eval("40 + 2".to_string()).unwrap().downcast::<i32>() {
println!("Answer: {}", *result); // prints 42 println!("Answer: {}", *result); // prints 42
}
} }
``` ```
# Example 2: Working with functions # Example 2: Working with functions
@ -79,6 +84,9 @@ if let Ok(result) = engine.eval("40 + 2".to_string()).unwrap().downcast::<i32>()
Rhai's scripting engine is very lightweight. It gets its ability from the functions in your program. To call these functions, you need to register them with the scripting engine. Rhai's scripting engine is very lightweight. It gets its ability from the functions in your program. To call these functions, you need to register them with the scripting engine.
```Rust ```Rust
extern crate rhai;
use rhai::{Engine, FnRegister};
fn add(x: i32, y: i32) -> i32 { fn add(x: i32, y: i32) -> i32 {
x + y x + y
} }
@ -99,6 +107,11 @@ fn main() {
Generic functions can be used in Rhai, but you'll need to register separate instances for each concrete type: Generic functions can be used in Rhai, but you'll need to register separate instances for each concrete type:
```Rust ```Rust
use std::fmt::Display;
extern crate rhai;
use rhai::{Engine, FnRegister};
fn showit<T: Display>(x: &mut T) -> () { fn showit<T: Display>(x: &mut T) -> () {
println!("{}", x) println!("{}", x)
} }
@ -119,6 +132,9 @@ You can also see in this example how you can register multiple functions (or in
Here's an more complete example of working with Rust. First the example, then we'll break it into parts: Here's an more complete example of working with Rust. First the example, then we'll break it into parts:
```Rust ```Rust
extern crate rhai;
use rhai::{Engine, FnRegister};
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
struct TestStruct { struct TestStruct {
x: i32 x: i32
@ -134,15 +150,17 @@ impl TestStruct {
} }
} }
let mut engine = Engine::new(); fn main() {
let mut engine = Engine::new();
engine.register_type::<TestStruct>(); engine.register_type::<TestStruct>();
&(TestStruct::update as fn(&mut TestStruct)->()).register(&mut engine, "update"); &(TestStruct::update as fn(&mut TestStruct)->()).register(&mut engine, "update");
&(TestStruct::new as fn()->TestStruct).register(&mut engine, "new_ts"); &(TestStruct::new as fn()->TestStruct).register(&mut engine, "new_ts");
if let Ok(result) = engine.eval("var x = new_ts(); x.update(); x".to_string()).unwrap().downcast::<TestStruct>() { if let Ok(result) = engine.eval("var x = new_ts(); x.update(); x".to_string()).unwrap().downcast::<TestStruct>() {
println!("result: {}", result.x); // prints 1001 println!("result: {}", result.x); // prints 1001
}
} }
``` ```