79 lines
2.3 KiB
Rust
79 lines
2.3 KiB
Rust
use rhai::{Engine, EvalAltResult, EvalContext, Expression, ParseErrorType, INT};
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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.consume("while false {}")?;
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// Disable 'while' and make sure it still works with custom syntax
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engine.disable_symbol("while");
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assert!(matches!(
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*engine.compile("while false {}").expect_err("should error").0,
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ParseErrorType::Reserved(err) if err == "while"
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));
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assert!(matches!(
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*engine.compile("let while = 0").expect_err("should error").0,
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ParseErrorType::Reserved(err) if err == "while"
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));
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engine.register_custom_syntax(
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&[
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"do", "|", "$ident$", "|", "->", "$block$", "while", "$expr$",
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],
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1,
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|context: &mut EvalContext, inputs: &[Expression]| {
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let var_name = inputs[0].get_variable_name().unwrap().to_string();
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let stmt = inputs.get(1).unwrap();
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let condition = inputs.get(2).unwrap();
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context.scope.push(var_name, 0 as INT);
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loop {
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context.eval_expression_tree(stmt)?;
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let stop = !context
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.eval_expression_tree(condition)?
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.as_bool()
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.map_err(|err| {
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Box::new(EvalAltResult::ErrorMismatchDataType(
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"bool".to_string(),
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err.to_string(),
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condition.position(),
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))
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})?;
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if stop {
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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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// 'while' is now a custom keyword so this it can no longer be a variable
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engine.consume("let while = 0").expect_err("should error");
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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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// The first symbol must be an identifier
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assert_eq!(
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*engine
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.register_custom_syntax(&["!"], 0, |_, _| Ok(().into()))
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.expect_err("should error")
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.0,
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ParseErrorType::BadInput("Improper symbol for custom syntax: '!'".to_string())
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);
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Ok(())
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}
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