rhai/tests/print.rs

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use rhai::{Engine, EvalAltResult, RegisterFn, INT};
use std::sync::{Arc, RwLock};
#[test]
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fn test_print_debug() -> Result<(), Box<EvalAltResult>> {
let logbook = Arc::new(RwLock::new(Vec::<String>::new()));
// Redirect print/debug output to 'log'
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let log1 = logbook.clone();
let log2 = logbook.clone();
let mut engine = Engine::new();
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engine
.on_print(move |s| log1.write().unwrap().push(format!("entry: {}", s)))
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.on_debug(move |s, pos| {
log2.write()
.unwrap()
.push(format!("DEBUG at {:?}: {}", pos, s))
});
// Evaluate script
engine.eval::<()>("print(40 + 2)")?;
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engine.eval::<()>(r#"let x = "hello!"; debug(x)"#)?;
// 'logbook' captures all the 'print' and 'debug' output
assert_eq!(logbook.read().unwrap().len(), 2);
assert_eq!(logbook.read().unwrap()[0], "entry: 42");
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assert_eq!(logbook.read().unwrap()[1], r#"DEBUG at 1:19: "hello!""#);
for entry in logbook.read().unwrap().iter() {
println!("{}", entry);
}
Ok(())
}
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#[derive(Debug, Clone, Eq, PartialEq, Hash, Default)]
struct MyStruct {
field: INT,
}
impl std::fmt::Display for MyStruct {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "hello: {}", self.field)
}
}
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#[cfg(not(feature = "no_object"))]
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#[test]
fn test_print_custom_type() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine
.register_type_with_name::<MyStruct>("MyStruct")
.register_fn("to_debug", |x: &mut MyStruct| x.to_string())
.register_fn("debug", |x: &mut MyStruct| x.to_string())
.register_fn("new_ts", || MyStruct { field: 42 });
engine.consume("let x = new_ts(); debug(x);")?;
#[cfg(not(feature = "no_index"))]
assert_eq!(
engine.eval::<String>(
r#"
let x = [ 123, true, (), "world", new_ts() ];
x.to_string()
"#
)?,
r#"[123, true, (), "world", hello: 42]"#
);
assert!(engine
.eval::<String>(
r#"
let x = #{ a:123, b:true, c:(), d:"world", e:new_ts() };
x.to_string()
"#
)?
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.contains(r#""e": hello: 42"#));
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Ok(())
}