rhai/tests/var_scope.rs
2020-03-10 09:30:12 +08:00

49 lines
1.5 KiB
Rust

use rhai::{Engine, EvalAltResult, Scope};
#[test]
fn test_var_scope() -> Result<(), EvalAltResult> {
let mut engine = Engine::new();
let mut scope = Scope::new();
engine.eval_with_scope::<()>(&mut scope, false, "let x = 4 + 5")?;
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, false, "x")?, 9);
engine.eval_with_scope::<()>(&mut scope, false, "x = x + 1; x = x + 2;")?;
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, false, "x")?, 12);
assert_eq!(
engine.eval_with_scope::<()>(&mut scope, false, "{let x = 3}")?,
()
);
assert_eq!(engine.eval_with_scope::<i64>(&mut scope, false, "x")?, 12);
Ok(())
}
#[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", 42_i64);
scope.push("z", 999_i64);
// First invocation
engine
.eval_with_scope::<()>(&mut scope, false, " let x = 4 + 5 - y + z; y = 1;")
.expect("y and z not found?");
// Second invocation using the same state
let result = engine.eval_with_scope::<i64>(&mut scope, false, "x")?;
println!("result: {}", result); // should print 966
// Variable y is changed in the script
assert_eq!(scope.get_value::<i64>("y").unwrap(), 1);
Ok(())
}