rhai/tests/var_scope.rs

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use rhai::{Engine, EvalAltResult, Scope};
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#[test]
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fn test_var_scope() -> Result<(), EvalAltResult> {
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let mut engine = Engine::new();
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let mut scope = Scope::new();
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engine.eval_with_scope::<()>(&mut scope, "let x = 4 + 5")?;
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, "x")?, 9);
engine.eval_with_scope::<()>(&mut scope, "x = x + 1; x = x + 2;")?;
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, "x")?, 12);
assert_eq!(engine.eval_with_scope::<()>(&mut scope, "{let x = 3}")?, ());
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, "x")?, 12);
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Ok(())
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}
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#[test]
fn test_scope_eval() -> Result<(), EvalAltResult> {
let mut engine = Engine::new();
// First create the state
let mut scope = Scope::new();
// Then push some initialized variables into the state
// NOTE: Remember the default numbers used by Rhai are i64 and f64.
// Better stick to them or it gets hard to work with other variables in the script.
scope.push("y".into(), 42_i64);
scope.push("z".into(), 999_i64);
// First invocation
engine
.eval_with_scope::<()>(
&mut scope,
r"
let x = 4 + 5 - y + z;
y = 1;
",
)
.expect("y and z not found?");
// Second invocation using the same state
if let Ok(result) = engine.eval_with_scope::<i64>(&mut scope, "x") {
println!("result: {}", result); // should print 966
}
// Variable y is changed in the script
assert_eq!(scope.get_value::<i64>("y").unwrap(), 1);
Ok(())
}