97 lines
3.1 KiB
Rust
97 lines
3.1 KiB
Rust
use rhai::{Engine, EvalAltResult, Position, Scope, INT};
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#[test]
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fn test_var_scope() -> Result<(), Box<EvalAltResult>> {
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let engine = Engine::new();
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let mut scope = Scope::new();
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engine.eval_with_scope::<()>(&mut scope, "let x = 4 + 5")?;
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assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 9);
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engine.eval_with_scope::<()>(&mut scope, "x += 1; x += 2;")?;
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assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 12);
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scope.set_value("x", 42 as INT);
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assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 42);
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engine.eval_with_scope::<()>(&mut scope, "{let x = 3}")?;
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assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "x")?, 42);
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Ok(())
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}
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#[test]
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fn test_scope_eval() -> Result<(), Box<EvalAltResult>> {
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let engine = Engine::new();
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// First create the state
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let mut scope = Scope::new();
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// Then push some initialized variables into the state
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// NOTE: Remember the default numbers used by Rhai are INT and f64.
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// Better stick to them or it gets hard to work with other variables in the script.
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scope.push("y", 42 as INT);
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scope.push("z", 999 as INT);
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// First invocation
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engine
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.eval_with_scope::<()>(&mut scope, " let x = 4 + 5 - y + z; y = 1;")
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.expect("y and z not found?");
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// Second invocation using the same state
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let result = engine.eval_with_scope::<INT>(&mut scope, "x")?;
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println!("result: {}", result); // should print 966
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// Variable y is changed in the script
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assert_eq!(
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scope
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.get_value::<INT>("y")
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.expect("variable y should exist"),
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1
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);
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Ok(())
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}
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#[test]
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fn test_var_resolver() -> Result<(), Box<EvalAltResult>> {
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let mut engine = Engine::new();
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let mut scope = Scope::new();
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scope.push("innocent", 1 as INT);
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scope.push("chameleon", 123 as INT);
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scope.push("DO_NOT_USE", 999 as INT);
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engine.on_var(|name, _, context| {
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match name {
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"MYSTIC_NUMBER" => Ok(Some((42 as INT).into())),
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// Override a variable - make it not found even if it exists!
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"DO_NOT_USE" => {
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Err(EvalAltResult::ErrorVariableNotFound(name.to_string(), Position::NONE).into())
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}
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// Silently maps 'chameleon' into 'innocent'.
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"chameleon" => context
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.scope
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.get_value("innocent")
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.map(Some)
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.ok_or_else(|| {
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EvalAltResult::ErrorVariableNotFound(name.to_string(), Position::NONE).into()
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}),
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// Return Ok(None) to continue with the normal variable resolution process.
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_ => Ok(None),
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}
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});
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assert_eq!(
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engine.eval_with_scope::<INT>(&mut scope, "MYSTIC_NUMBER")?,
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42
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);
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assert_eq!(engine.eval_with_scope::<INT>(&mut scope, "chameleon")?, 1);
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assert!(
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matches!(*engine.eval_with_scope::<INT>(&mut scope, "DO_NOT_USE").expect_err("should error"),
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EvalAltResult::ErrorVariableNotFound(n, _) if n == "DO_NOT_USE")
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);
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Ok(())
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}
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