alef 0.25.1

Opinionated polyglot binding generator for Rust libraries
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

use super::*;

#[test]
fn test_struct_with_default_derive() {
    let source = r#"
        /// A configuration with sensible defaults.
        #[derive(Default, Clone)]
        pub struct Config {
            pub name: String,
            pub count: u32,
            pub enabled: bool,
        }
    "#;

    let surface = extract_from_source(source);
    assert_eq!(surface.types.len(), 1);

    let config = &surface.types[0];
    assert_eq!(config.name, "Config");
    // has_default should be true for types with #[derive(Default)]
    assert!(
        config.has_default,
        "Config with #[derive(Default)] should have has_default=true"
    );
}

#[test]
fn test_struct_without_default() {
    let source = r#"
        /// A configuration without defaults.
        pub struct Custom {
            pub value: String,
        }
    "#;

    let surface = extract_from_source(source);
    assert_eq!(surface.types.len(), 1);

    let custom = &surface.types[0];
    assert_eq!(custom.name, "Custom");
    assert!(
        !custom.has_default,
        "Struct without Default should have has_default=false"
    );
}

#[test]
fn test_impl_default_without_fn_default() {
    let source = r#"
        pub struct Incomplete {
            pub value: u32,
        }

        impl Default for Incomplete {
            // Missing fn default() - no matching method
        }
    "#;

    let surface = extract_from_source(source);
    let incomplete = &surface.types[0];
    let value_field = &incomplete.fields[0];

    // When fn default() is not found, fields should get Empty
    assert_eq!(
        value_field.typed_default,
        Some(crate::core::ir::DefaultValue::Empty),
        "Fields should have Empty when fn default() is missing"
    );
}

#[test]
fn test_enum_with_default_derive_and_default_variant() {
    let source = r#"
        #[derive(Default, Clone)]
        pub enum Priority {
            #[default]
            Normal,
            High,
            Low,
        }
    "#;

    let surface = extract_from_source(source);
    assert_eq!(surface.enums.len(), 1);

    let priority = &surface.enums[0];
    assert_eq!(priority.name, "Priority");
    assert_eq!(priority.variants.len(), 3);

    // The Normal variant should be marked as default
    let normal = &priority.variants[0];
    assert_eq!(normal.name, "Normal");
    assert!(
        normal.is_default,
        "Normal variant with #[default] should have is_default=true"
    );

    // Other variants should not be marked as default
    let high = &priority.variants[1];
    assert_eq!(high.name, "High");
    assert!(!high.is_default, "Non-default variant should have is_default=false");

    let low = &priority.variants[2];
    assert_eq!(low.name, "Low");
    assert!(!low.is_default);
}

#[test]
fn test_enum_without_default() {
    let source = r#"
        pub enum Format {
            Json,
            Xml,
            Yaml,
        }
    "#;

    let surface = extract_from_source(source);
    let format = &surface.enums[0];

    // No variants should be marked as default
    for variant in &format.variants {
        assert!(
            !variant.is_default,
            "Variants without #[default] should be is_default=false"
        );
    }
}