rhai/tests/var_scope.rs

55 lines
1.6 KiB
Rust

use rhai::{Engine, EvalAltResult, Scope, INT};
#[test]
fn test_var_scope() -> Result<(), EvalAltResult> {
let engine = Engine::new();
let mut scope = Scope::new();
engine.eval_with_scope::<()>(&mut scope, "let x = 4 + 5")?;
assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 9);
engine.eval_with_scope::<()>(&mut scope, "x = x + 1; x = x + 2;")?;
assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 12);
scope.set_value("x", 42 as INT);
assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 42);
engine.eval_with_scope::<()>(&mut scope, "{let x = 3}")?;
assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 42);
Ok(())
}
#[test]
fn test_scope_eval() -> Result<(), EvalAltResult> {
let 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 INT and f64.
// Better stick to them or it gets hard to work with other variables in the script.
scope.push("y", 42 as INT);
scope.push("z", 999 as INT);
// First invocation
engine
.eval_with_scope::<()>(&mut scope, " 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::<INT>(&mut scope, "x")?;
println!("result: {}", result); // should print 966
// Variable y is changed in the script
assert_eq!(
scope
.get_value::<INT>("y")
.expect("variable y should exist"),
1
);
Ok(())
}