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