50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
use rhai::{Engine, EvalAltResult, ParseErrorType, RegisterFn, INT};
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#[test]
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fn test_tokens_disabled() {
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let mut engine = Engine::new();
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engine.disable_symbol("if"); // disable the 'if' keyword
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assert!(matches!(
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*engine.compile("let x = if true { 42 } else { 0 };").expect_err("should error").0,
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ParseErrorType::MissingToken(ref token, _) if token == ";"
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));
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engine.disable_symbol("+="); // disable the '+=' operator
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assert!(matches!(
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*engine.compile("let x = 40 + 2; x += 1;").expect_err("should error").0,
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ParseErrorType::BadInput(ref s) if s == "Unexpected '+='"
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));
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}
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#[test]
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fn test_tokens_custom_operator() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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// Register a custom operator called `foo` and give it
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// a precedence of 140 (i.e. between +|- and *|/).
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engine.register_custom_operator("foo", 140).unwrap();
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// Register a binary function named `foo`
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engine.register_fn("foo", |x: INT, y: INT| (x * y) - (x + y));
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assert_eq!(
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engine.eval_expression::<INT>("1 + 2 * 3 foo 4 - 5 / 6")?,
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15
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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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fn foo(x, y) { y - x }
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1 + 2 * 3 foo 4 - 5 / 6
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"
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)?,
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-1
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);
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Ok(())
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}
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