rhai/tests/switch.rs

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use rhai::{Engine, EvalAltResult, ParseErrorType, Scope, INT};
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#[test]
fn test_switch() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
let mut scope = Scope::new();
scope.push("x", 42 as INT);
assert_eq!(
engine.eval_with_scope::<bool>(&mut scope, "switch x { 1 => (), 2 => 'a', 42 => true }")?,
true
);
assert_eq!(
engine.eval_with_scope::<bool>(&mut scope, "switch x { 1 => (), 2 => 'a', _ => true }")?,
true
);
assert_eq!(
engine.eval_with_scope::<()>(&mut scope, "switch x { 1 => 123, 2 => 'a' }")?,
()
);
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assert_eq!(
engine.eval::<INT>("let x = timestamp(); switch x { 1 => 123, _ => 42 }")?,
42
);
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assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
"switch x { 1 => 123, 42 => { x / 2 }, _ => 999 }"
)?,
21
);
#[cfg(not(feature = "no_index"))]
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
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"
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let y = [1, 2, 3];
switch y {
42 => 1,
true => 2,
[1, 2, 3] => 3,
_ => 9
}
"
)?,
3
);
#[cfg(not(feature = "no_object"))]
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
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"
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let y = #{a:1, b:true, c:'x'};
switch y {
42 => 1,
true => 2,
#{b:true, c:'x', a:1} => 3,
_ => 9
}
"
)?,
3
);
Ok(())
}
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#[test]
fn test_switch_errors() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert!(matches!(
*engine
.compile("switch x { 1 => 123, 1 => 42 }")
.expect_err("should error")
.0,
ParseErrorType::DuplicatedSwitchCase
));
assert!(matches!(
*engine
.compile("switch x { _ => 123, 1 => 42 }")
.expect_err("should error")
.0,
ParseErrorType::WrongSwitchDefaultCase
));
Ok(())
}
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#[test]
fn test_switch_condition() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
let mut scope = Scope::new();
scope.push("x", 42 as INT);
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
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"
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switch x / 2 {
21 if x > 40 => 1,
0 if x < 100 => 2,
1 => 3,
_ => 9
}
"
)?,
1
);
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
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"
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switch x / 2 {
21 if x < 40 => 1,
0 if x < 100 => 2,
1 => 3,
_ => 9
}
"
)?,
9
);
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assert!(matches!(
*engine
.compile(
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"
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switch x {
21 if x < 40 => 1,
21 if x == 10 => 10,
0 if x < 100 => 2,
1 => 3,
_ => 9
}
"
)
.expect_err("should error")
.0,
ParseErrorType::DuplicatedSwitchCase
));
assert!(matches!(
*engine
.compile("switch x { 1 => 123, _ if true => 42 }")
.expect_err("should error")
.0,
ParseErrorType::WrongSwitchCaseCondition
));
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Ok(())
}
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#[cfg(not(feature = "no_index"))]
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#[cfg(not(feature = "no_object"))]
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mod test_switch_enum {
use super::*;
use rhai::Array;
#[derive(Debug, Clone)]
enum MyEnum {
Foo,
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Bar(INT),
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Baz(String, bool),
}
impl MyEnum {
fn get_enum_data(&mut self) -> Array {
match self {
Self::Foo => vec!["Foo".into()] as Array,
Self::Bar(num) => vec!["Bar".into(), (*num).into()] as Array,
Self::Baz(name, option) => {
vec!["Baz".into(), name.clone().into(), (*option).into()] as Array
}
}
}
}
#[test]
fn test_switch_enum() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
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engine
.register_type_with_name::<MyEnum>("MyEnum")
.register_get("get_data", MyEnum::get_enum_data);
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let mut scope = Scope::new();
scope.push("x", MyEnum::Baz("hello".to_string(), true));
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
r#"
switch x.get_data {
["Foo"] => 1,
["Bar", 42] => 2,
["Bar", 123] => 3,
["Baz", "hello", false] => 4,
["Baz", "hello", true] => 5,
_ => 9
}
"#
)?,
5
);
Ok(())
}
}