rhai/tests/internal_fn.rs

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#![cfg(not(feature = "no_function"))]
use rhai::{Engine, EvalAltResult, ParseErrorType, INT};
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#[test]
fn test_internal_fn() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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assert_eq!(
engine.eval::<INT>("fn add_me(a, b) { a+b } add_me(3, 4)")?,
7
);
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assert_eq!(
engine.eval::<INT>("fn add_me(a, b,) { a+b } add_me(3, 4,)")?,
7
);
assert_eq!(engine.eval::<INT>("fn bob() { return 4; 5 } bob()")?, 4);
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assert_eq!(engine.eval::<INT>("fn add(x, n) { x + n } add(40, 2)")?, 42);
assert_eq!(
engine.eval::<INT>("fn add(x, n,) { x + n } add(40, 2,)")?,
42
);
assert_eq!(
engine.eval::<INT>("fn add(x, n) { x + n } let a = 40; add(a, 2); a")?,
40
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>("fn add(n) { this + n } let x = 40; x.add(2)")?,
42
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>("fn add(n) { this += n; } let x = 40; x.add(2); x")?,
42
);
assert_eq!(engine.eval::<INT>("fn mul2(x) { x * 2 } mul2(21)")?, 42);
assert_eq!(
engine.eval::<INT>("fn mul2(x) { x *= 2 } let a = 21; mul2(a); a")?,
21
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>("fn mul2() { this * 2 } let x = 21; x.mul2()")?,
42
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>("fn mul2() { this *= 2; } let x = 21; x.mul2(); x")?,
42
);
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Ok(())
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}
#[test]
fn test_internal_fn_big() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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assert_eq!(
engine.eval::<INT>(
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"
fn math_me(a, b, c, d, e, f) {
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a - b * c + d * e - f
}
math_me(100, 5, 2, 9, 6, 32)
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",
)?,
112
);
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Ok(())
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}
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#[test]
fn test_internal_fn_overloading() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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assert_eq!(
engine.eval::<INT>(
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"
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fn abc(x,y,z) { 2*x + 3*y + 4*z + 888 }
fn abc(x,y) { x + 2*y + 88 }
fn abc() { 42 }
fn abc(x) { x - 42 }
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abc() + abc(1) + abc(1,2) + abc(1,2,3)
"
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)?,
1002
);
assert_eq!(
*engine
.compile(
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"
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fn abc(x) { x + 42 }
fn abc(x) { x - 42 }
"
)
.expect_err("should error")
.0,
ParseErrorType::FnDuplicatedDefinition("abc".to_string(), 1)
);
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Ok(())
}
#[test]
fn test_internal_fn_params() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
// Expect duplicated parameters error
assert_eq!(
*engine
.compile("fn hello(x, x) { x }")
.expect_err("should be error")
.0,
ParseErrorType::FnDuplicatedParam("hello".to_string(), "x".to_string())
);
Ok(())
}
#[test]
fn test_function_pointers() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(engine.eval::<String>(r#"type_of(Fn("abc"))"#)?, "Fn");
assert_eq!(
engine.eval::<INT>(
r#"
fn foo(x) { 40 + x }
let f = Fn("foo");
call(f, 2)
"#
)?,
42
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>(
r#"
fn foo(x) { 40 + x }
let fn_name = "f";
fn_name += "oo";
let f = Fn(fn_name);
f.call(2)
"#
)?,
42
);
#[cfg(not(feature = "no_object"))]
assert!(matches!(
*engine.eval::<INT>(r#"let f = Fn("abc"); f.call(0)"#).expect_err("should error"),
EvalAltResult::ErrorFunctionNotFound(f, _) if f.starts_with("abc (")
));
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>(
r#"
fn foo(x) { 40 + x }
let x = #{ action: Fn("foo") };
x.action.call(2)
"#
)?,
42
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval::<INT>(
r#"
fn foo(x) { this.data += x; }
let x = #{ data: 40, action: Fn("foo") };
x.action(2);
x.data
"#
)?,
42
);
Ok(())
}
#[test]
#[cfg(not(feature = "no_closure"))]
fn test_internal_fn_captures() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(
engine.eval::<INT>(
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"
fn foo(y) { x += y; x }
let x = 41;
let y = 999;
foo!(1) + x
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"
)?,
83
);
assert!(engine
.eval::<INT>(
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"
fn foo(y) { x += y; x }
let x = 41;
let y = 999;
foo(1) + x
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"
)
.is_err());
#[cfg(not(feature = "no_object"))]
assert!(matches!(
*engine
.compile(
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"
fn foo() { this += x; }
let x = 41;
let y = 999;
y.foo!();
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"
)
.expect_err("should error")
.0,
ParseErrorType::MalformedCapture(_)
));
Ok(())
}
#[test]
fn test_internal_fn_is_def() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert!(engine.eval::<bool>(
r#"
fn foo(x) { x + 1 }
is_def_fn("foo", 1)
"#
)?);
assert!(!engine.eval::<bool>(
r#"
fn foo(x) { x + 1 }
is_def_fn("bar", 1)
"#
)?);
assert!(!engine.eval::<bool>(
r#"
fn foo(x) { x + 1 }
is_def_fn("foo", 0)
"#
)?);
Ok(())
}