rhai/tests/expressions.rs

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use rhai::{Engine, EvalAltResult, Scope, INT};
#[test]
fn test_expressions() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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let mut scope = Scope::new();
scope.push("x", 10 as INT);
assert_eq!(engine.eval_expression::<INT>("2 + (10 + 10) * 2")?, 42);
assert_eq!(
engine.eval_expression_with_scope::<INT>(&mut scope, "2 + (x + 10) * 2")?,
42
);
assert!(engine
.eval_expression_with_scope::<INT>(&mut scope, "if x > 0 { 42 } else { 123 }")
.is_err());
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assert!(engine.eval_expression::<()>("40 + 2;").is_err());
assert!(engine.eval_expression::<()>("40 + { 2 }").is_err());
assert!(engine.eval_expression::<()>("x = 42").is_err());
assert!(engine.compile_expression("let x = 42").is_err());
Ok(())
}
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/// This example taken from https://github.com/jonathandturner/rhai/issues/115
#[test]
#[cfg(not(feature = "no_object"))]
fn test_expressions_eval() -> Result<(), Box<EvalAltResult>> {
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#[derive(Debug, Clone)]
struct AGENT {
pub gender: String,
pub age: INT,
}
impl AGENT {
pub fn get_gender(&mut self) -> String {
self.gender.clone()
}
pub fn get_age(&mut self) -> INT {
self.age
}
}
// This is your agent
let my_agent = AGENT {
gender: "male".into(),
age: 42,
};
// Create the engine
let mut engine = Engine::new();
// Register your AGENT type
engine.register_type_with_name::<AGENT>("AGENT");
engine.register_get("gender", AGENT::get_gender);
engine.register_get("age", AGENT::get_age);
// Create your context, add the agent as a constant
let mut scope = Scope::new();
scope.push_constant("agent", my_agent);
// Evaluate the expression
let result: bool = engine.eval_expression_with_scope(
&mut scope,
r#"
agent.age > 10 && agent.gender == "male"
"#,
)?;
assert_eq!(result, true);
Ok(())
}