rhai/tests/side_effects.rs
2021-08-17 15:50:56 +08:00

82 lines
2.2 KiB
Rust

///! This test simulates an external command object that is driven by a script.
use rhai::{Engine, EvalAltResult, Scope, INT};
use std::sync::{Arc, Mutex, RwLock};
/// Simulate a command object.
struct Command {
/// Simulate an external state.
state: INT,
}
impl Command {
/// Do some action.
pub fn action(&mut self, val: INT) {
self.state = val;
}
/// Get current value.
pub fn get(&self) -> INT {
self.state
}
}
type API = Arc<Mutex<Command>>;
#[cfg(not(feature = "no_object"))]
#[test]
fn test_side_effects_command() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
let mut scope = Scope::new();
// Create the command object with initial state, handled by an `Arc`.
let command = Arc::new(Mutex::new(Command { state: 12 }));
assert_eq!(command.lock().unwrap().get(), 12);
// Create the API object.
let api = command.clone(); // Notice this clones the `Arc` only
// Make the API object a singleton in the script environment.
scope.push_constant("Command", api);
// Register type.
engine.register_type_with_name::<API>("CommandType");
engine.register_fn("action", |api: &mut API, x: INT| {
let mut command = api.lock().unwrap();
let val = command.get();
command.action(val + x);
});
engine.register_get("value", |command: &mut API| command.lock().unwrap().get());
assert_eq!(
engine.eval_with_scope::<INT>(
&mut scope,
"
// Drive the command object via the wrapper
Command.action(30);
Command.value
"
)?,
42
);
// Make sure the actions are properly performed
assert_eq!(command.lock().unwrap().get(), 42);
Ok(())
}
#[test]
fn test_side_effects_print() -> Result<(), Box<EvalAltResult>> {
let result = Arc::new(RwLock::new(String::new()));
let mut engine = Engine::new();
// Override action of 'print' function
let logger = result.clone();
engine.on_print(move |s| logger.write().unwrap().push_str(s));
engine.run("print(40 + 2);")?;
assert_eq!(*result.read().unwrap(), "42");
Ok(())
}