[go: up one dir, main page]

rhai 0.19.10

Embedded scripting for Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97

use rhai::{Engine, EvalAltResult, ParseErrorType, RegisterFn, Scope, INT};

#[test]
fn test_constant() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();

    assert_eq!(engine.eval::<INT>("const x = 123; x")?, 123);

    assert!(matches!(
        *engine
            .eval::<INT>("const x = 123; x = 42;")
            .expect_err("expects error"),
        EvalAltResult::ErrorParsing(ParseErrorType::AssignmentToConstant(x), _) if x == "x"
    ));

    #[cfg(not(feature = "no_index"))]
    assert!(matches!(
        *engine.consume("const x = [1, 2, 3, 4, 5]; x[2] = 42;").expect_err("expects error"),
        EvalAltResult::ErrorParsing(ParseErrorType::AssignmentToConstant(x), _) if x == "x"
    ));

    Ok(())
}

#[test]
fn test_constant_scope() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();

    let mut scope = Scope::new();
    scope.push_constant("x", 42 as INT);

    assert!(matches!(
        *engine.consume_with_scope(&mut scope, "x = 1").expect_err("expects error"),
        EvalAltResult::ErrorAssignmentToConstant(x, _) if x == "x"
    ));

    Ok(())
}

#[test]
fn test_var_is_def() -> Result<(), Box<EvalAltResult>> {
    let engine = Engine::new();

    assert!(engine.eval::<bool>(
        r#"
            let x = 42;
            is_def_var("x")
    "#
    )?);
    assert!(!engine.eval::<bool>(
        r#"
            let x = 42;
            is_def_var("y")
    "#
    )?);
    assert!(engine.eval::<bool>(
        r#"
            const x = 42;
            is_def_var("x")
    "#
    )?);

    Ok(())
}

#[cfg(not(feature = "no_object"))]
#[test]
fn test_constant_mut() -> Result<(), Box<EvalAltResult>> {
    #[derive(Debug, Clone)]
    struct TestStruct(INT); // custom type

    let mut engine = Engine::new();

    engine
        .register_type_with_name::<TestStruct>("TestStruct")
        .register_get("value", |obj: &mut TestStruct| obj.0)
        .register_fn("update_value", |obj: &mut TestStruct, value: INT| {
            obj.0 = value
        });

    let mut scope = Scope::new();

    scope.push_constant("MY_NUMBER", TestStruct(123));

    assert_eq!(
        engine.eval_with_scope::<INT>(
            &mut scope,
            r"
                MY_NUMBER.update_value(42);
                MY_NUMBER.value
            ",
        )?,
        42
    );

    Ok(())
}