rhai/tests/constants.rs

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use rhai::{Engine, EvalAltResult, ParseErrorType, Scope, INT};
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#[test]
fn test_constant() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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assert_eq!(engine.eval::<INT>("const x = 123; x")?, 123);
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assert!(matches!(
*engine
.eval::<INT>("const x = 123; x = 42;")
.expect_err("expects error"),
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EvalAltResult::ErrorParsing(ParseErrorType::AssignmentToConstant(x), ..) if x == "x"
));
#[cfg(not(feature = "no_index"))]
assert!(matches!(
*engine.run("const x = [1, 2, 3, 4, 5]; x[2] = 42;").expect_err("expects error"),
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EvalAltResult::ErrorAssignmentToConstant(x, ..) if x == "x"
));
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Ok(())
}
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#[test]
fn test_constant_scope() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
let mut scope = Scope::new();
scope.push_constant("x", 42 as INT);
assert!(matches!(
*engine.run_with_scope(&mut scope, "x = 1").expect_err("expects error"),
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EvalAltResult::ErrorAssignmentToConstant(x, ..) if x == "x"
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));
Ok(())
}
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#[cfg(not(feature = "no_object"))]
#[test]
fn test_constant_mut() -> Result<(), Box<EvalAltResult>> {
#[derive(Debug, Clone)]
struct TestStruct(INT); // custom type
let mut engine = Engine::new();
fn set_value(obj: &mut TestStruct, value: INT) {
obj.0 = value;
}
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engine
.register_type_with_name::<TestStruct>("TestStruct")
.register_fn("new_ts", || TestStruct(123))
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.register_get("value", |obj: &mut TestStruct| obj.0)
.register_set("value", set_value)
.register_fn("update_value", set_value);
assert_eq!(
engine.eval::<INT>(
"
const MY_NUMBER = new_ts();
MY_NUMBER.update_value(42);
MY_NUMBER.value
",
)?,
42
);
assert_eq!(
engine.eval::<INT>(
"
const MY_NUMBER = new_ts();
update_value(MY_NUMBER, 42);
MY_NUMBER.value
",
)?,
123
);
assert!(matches!(
*engine
.run(
"
const MY_NUMBER = new_ts();
MY_NUMBER.value = 42;
"
)
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.unwrap_err(),
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EvalAltResult::ErrorNonPureMethodCallOnConstant(..)
));
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let mut scope = Scope::new();
scope.push_constant("MY_NUMBER", TestStruct(123));
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
"
update_value(MY_NUMBER, 42);
MY_NUMBER.value
",
)?,
123
);
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assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
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"
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MY_NUMBER.update_value(42);
MY_NUMBER.value
",
)?,
42
);
assert!(matches!(
*engine
.run_with_scope(&mut scope, "MY_NUMBER.value = 42;")
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.unwrap_err(),
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EvalAltResult::ErrorNonPureMethodCallOnConstant(..)
));
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Ok(())
}