rhai/tests/syntax.rs
2020-07-09 19:54:28 +08:00

70 lines
2.0 KiB
Rust

#![cfg(feature = "internals")]
use rhai::{
Dynamic, Engine, EvalAltResult, EvalState, Expr, Imports, LexError, Module, Scope, INT,
};
#[test]
fn test_custom_syntax() -> Result<(), Box<EvalAltResult>> {
let mut engine = Engine::new();
engine
.add_custom_syntax(
&["do", "$ident$", "$block$", "while", "$expr$"],
1,
|engine: &Engine,
scope: &mut Scope,
mods: &mut Imports,
state: &mut EvalState,
lib: &Module,
this_ptr: &mut Option<&mut Dynamic>,
exprs: &[Expr],
level: usize| {
let var_name = match exprs.get(0).unwrap() {
Expr::Variable(s) => (s.0).0.clone(),
_ => unreachable!(),
};
let stmt = exprs.get(1).unwrap();
let expr = exprs.get(2).unwrap();
scope.push(var_name, 0 as INT);
loop {
engine.eval_expr_from_ast(scope, mods, state, lib, this_ptr, stmt, level)?;
if !engine
.eval_expr_from_ast(scope, mods, state, lib, this_ptr, expr, level)?
.as_bool()
.map_err(|_| {
EvalAltResult::ErrorBooleanArgMismatch(
"do-while".into(),
expr.position(),
)
})?
{
break;
}
}
Ok(().into())
},
)
.unwrap();
assert!(matches!(
*engine.add_custom_syntax(&["!"], 0, |_, _, _, _, _, _, _, _| Ok(().into())).expect_err("should error"),
LexError::ImproperSymbol(s) if s == "!"
));
assert_eq!(
engine.eval::<INT>(
r"
do x { x += 1 } while x < 42;
x
"
)?,
42
);
Ok(())
}