rhai/tests/closures.rs
2020-08-22 23:01:25 +08:00

253 lines
5.8 KiB
Rust

#![cfg(not(feature = "no_function"))]
use rhai::{Dynamic, Engine, EvalAltResult, FnPtr, Module, ParseErrorType, RegisterFn, Scope, INT};
use std::any::TypeId;
use std::cell::RefCell;
use std::mem::take;
use std::rc::Rc;
#[cfg(not(feature = "no_object"))]
use rhai::Map;
#[test]
fn test_fn_ptr_curry_call() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
#[allow(deprecated)]
engine.register_raw_fn(
"call_with_arg",
&[TypeId::of::<FnPtr>(), TypeId::of::<INT>()],
|engine: &Engine, lib: &Module, args: &mut [&mut Dynamic]| {
let fn_ptr = std::mem::take(args[0]).cast::<FnPtr>();
fn_ptr.call_dynamic(engine, lib, None, [std::mem::take(args[1])])
},
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>(
r#"
let addition = |x, y| { x + y };
let curried = addition.curry(2);
call_with_arg(curried, 40)
"#
)?,
42
);
Ok(())
}
#[test]
#[cfg(not(feature = "no_closure"))]
#[cfg(not(feature = "no_object"))]
fn test_closures() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
assert!(matches!(
*engine
.compile_expression("let f = |x| {};")
.expect_err("should error")
.0,
ParseErrorType::BadInput(_)
));
assert_eq!(
engine.eval::<INT>(
r#"
let x = 8;
let res = |y, z| {
let w = 12;
return (|| x + y + z + w).call();
}.curry(15).call(2);
res + (|| x - 3).call()
"#
)?,
42
);
assert_eq!(
engine.eval::<INT>(
r#"
let a = 41;
let foo = |x| { a += x };
foo.call(1);
a
"#
)?,
42
);
assert!(engine.eval::<bool>(
r#"
let a = 41;
let foo = |x| { a += x };
a.is_shared()
"#
)?);
engine.register_fn("plus_one", |x: INT| x + 1);
assert_eq!(
engine.eval::<INT>(
r#"
let a = 41;
let f = || plus_one(a);
f.call()
"#
)?,
42
);
assert_eq!(
engine.eval::<INT>(
r#"
let a = 40;
let f = |x| {
let f = |x| {
let f = |x| plus_one(a) + x;
f.call(x)
};
f.call(x)
};
f.call(1)
"#
)?,
42
);
assert_eq!(
engine.eval::<INT>(
r#"
let a = 21;
let f = |x| a += x;
f.call(a);
a
"#
)?,
42
);
#[allow(deprecated)]
engine.register_raw_fn(
"custom_call",
&[TypeId::of::<INT>(), TypeId::of::<FnPtr>()],
|engine: &Engine, module: &Module, args: &mut [&mut Dynamic]| {
let func = take(args[1]).cast::<FnPtr>();
func.call_dynamic(engine, module, None, [])
},
);
assert_eq!(
engine.eval::<INT>(
r#"
let a = 41;
let b = 0;
let f = || b.custom_call(|| a + 1);
f.call()
"#
)?,
42
);
Ok(())
}
#[test]
#[cfg(not(feature = "no_closure"))]
#[cfg(not(feature = "no_object"))]
#[cfg(not(feature = "sync"))]
fn test_closures_data_race() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(
engine.eval::<INT>(
r#"
let a = 1;
let b = 40;
let foo = |x| { this += a + x };
b.call(foo, 1);
b
"#
)?,
42
);
assert!(matches!(
*engine
.eval::<INT>(
r#"
let a = 20;
let foo = |x| { this += a + x };
a.call(foo, 1);
a
"#
)
.expect_err("should error"),
EvalAltResult::ErrorDataRace(_, _)
));
Ok(())
}
type MyType = Rc<RefCell<INT>>;
#[test]
#[cfg(not(feature = "no_object"))]
#[cfg(not(feature = "sync"))]
fn test_closure_shared_obj() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
// Register API on MyType
engine
.register_type_with_name::<MyType>("MyType")
.register_get_set(
"data",
|p: &mut MyType| *p.borrow(),
|p: &mut MyType, value: INT| *p.borrow_mut() = value,
)
.register_fn("+=", |p1: &mut MyType, p2: MyType| {
*p1.borrow_mut() += *p2.borrow()
})
.register_fn("-=", |p1: &mut MyType, p2: MyType| {
*p1.borrow_mut() -= *p2.borrow()
});
let engine = engine; // Make engine immutable
let code = r#"
#{
name: "A",
description: "B",
cost: 1,
health_added: 0,
action: |p1, p2| { p1 += p2 }
}
"#;
let ast = engine.compile(code)?;
let res = engine.eval_ast::<Map>(&ast)?;
// Make closure
let f = move |p1: MyType, p2: MyType| -> Result<(), Box<EvalAltResult>> {
let action_ptr = res["action"].clone().cast::<FnPtr>();
let name = action_ptr.fn_name();
engine.call_fn::<_, ()>(&mut Scope::new(), &ast, name, (p1, p2))
};
// Test closure
let p1 = Rc::new(RefCell::new(41));
let p2 = Rc::new(RefCell::new(1));
f(p1.clone(), p2.clone())?;
assert_eq!(*p1.borrow(), 42);
Ok(())
}