alef 0.25.4

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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222

use super::*;

// ==============================================================================
// Tests for functional RefMut pattern (non-opaque types, frozen PyO3/WASM)
// ==============================================================================

#[test]
fn test_gen_method_functional_ref_mut_unit_return() {
    // A RefMut method returning () on a non-opaque type should be generated as a
    // functional clone-mutate-return pattern: &self -> Self, not &mut self -> ().
    let typ = simple_type_def();
    let method = MethodDef {
        name: "apply_update".to_string(),
        params: vec![ParamDef {
            name: "count".to_string(),
            ty: TypeRef::Primitive(PrimitiveType::U32),
            optional: false,
            default: None,
            sanitized: false,
            typed_default: None,
            is_ref: false,
            is_mut: false,
            newtype_wrapper: None,
            original_type: None,
            map_is_ahash: false,
            map_key_is_cow: false,
            vec_inner_is_ref: false,
            map_is_btree: false,
            core_wrapper: alef::core::ir::CoreWrapper::None,
        }],
        return_type: TypeRef::Unit,
        is_async: false,
        is_static: false,
        error_type: None,
        doc: String::new(),
        receiver: Some(ReceiverKind::RefMut),
        sanitized: false,
        trait_source: None,
        returns_ref: false,
        returns_cow: false,
        return_newtype_wrapper: None,
        has_default_impl: false,
        binding_excluded: false,
        binding_exclusion_reason: None,
        version: Default::default(),
    };
    let mapper = RustMapper;
    let cfg = default_cfg();
    let adapter_bodies = AdapterBodies::default();
    let opaque_types = AHashSet::new();

    let result = gen_method(
        &method,
        &mapper,
        &cfg,
        &typ,
        false,
        &opaque_types,
        &AHashSet::new(),
        &adapter_bodies,
    );

    // Signature must use &self (not &mut self) and return Self
    assert!(result.contains("pub fn apply_update"), "should contain method name");
    assert!(result.contains("&self"), "should use &self receiver, not &mut self");
    assert!(!result.contains("&mut self"), "should not use &mut self");
    assert!(result.contains("-> Self"), "should return Self (functional pattern)");
    // Body: construct mutable core, call the method, return converted result
    assert!(result.contains("let mut core_self"), "should declare mutable core_self");
    assert!(
        result.contains("core_self.apply_update("),
        "should call core method on core_self"
    );
    assert!(
        result.contains("core_self.into()"),
        "should convert mutated core back to Self"
    );
}

#[test]
fn test_gen_method_functional_ref_mut_with_named_param() {
    // A RefMut method taking a Named (non-opaque) param should also use the functional pattern.
    // gen_call_args handles Named params via .into(), so this should work.
    let mut typ = simple_type_def();
    typ.name = "ConversionOptions".to_string();
    typ.rust_path = "my_crate::ConversionOptions".to_string();

    let method = MethodDef {
        name: "apply_update".to_string(),
        params: vec![ParamDef {
            name: "update".to_string(),
            ty: TypeRef::Named("ConversionOptionsUpdate".to_string()),
            optional: false,
            default: None,
            sanitized: false,
            typed_default: None,
            is_ref: false,
            is_mut: false,
            newtype_wrapper: None,
            original_type: None,
            map_is_ahash: false,
            map_key_is_cow: false,
            vec_inner_is_ref: false,
            map_is_btree: false,
            core_wrapper: alef::core::ir::CoreWrapper::None,
        }],
        return_type: TypeRef::Unit,
        is_async: false,
        is_static: false,
        error_type: None,
        doc: String::new(),
        receiver: Some(ReceiverKind::RefMut),
        sanitized: false,
        trait_source: None,
        returns_ref: false,
        returns_cow: false,
        return_newtype_wrapper: None,
        has_default_impl: false,
        binding_excluded: false,
        binding_exclusion_reason: None,
        version: Default::default(),
    };
    let mapper = RustMapper;
    let cfg = default_cfg();
    let adapter_bodies = AdapterBodies::default();
    let opaque_types = AHashSet::new();

    let result = gen_method(
        &method,
        &mapper,
        &cfg,
        &typ,
        false,
        &opaque_types,
        &AHashSet::new(),
        &adapter_bodies,
    );

    assert!(result.contains("pub fn apply_update"), "should contain method name");
    assert!(result.contains("&self"), "should use &self receiver");
    assert!(!result.contains("&mut self"), "should not use &mut self");
    assert!(result.contains("-> Self"), "should return Self");
    assert!(result.contains("let mut core_self"), "should declare mutable core_self");
    // Named param should be converted via .into() in the call args
    assert!(
        result.contains("update.into()"),
        "should convert Named param via .into()"
    );
    assert!(
        result.contains("core_self.into()"),
        "should convert mutated core back to Self"
    );
}

#[test]
fn test_gen_method_functional_ref_mut_with_error_type() {
    // A fallible RefMut method should return Result<Self, E> instead of ().
    let typ = simple_type_def();
    let method = MethodDef {
        name: "try_apply".to_string(),
        params: vec![ParamDef {
            name: "value".to_string(),
            ty: TypeRef::Primitive(PrimitiveType::U32),
            optional: false,
            default: None,
            sanitized: false,
            typed_default: None,
            is_ref: false,
            is_mut: false,
            newtype_wrapper: None,
            original_type: None,
            map_is_ahash: false,
            map_key_is_cow: false,
            vec_inner_is_ref: false,
            map_is_btree: false,
            core_wrapper: alef::core::ir::CoreWrapper::None,
        }],
        return_type: TypeRef::Unit,
        is_async: false,
        is_static: false,
        error_type: Some("MyError".to_string()),
        doc: String::new(),
        receiver: Some(ReceiverKind::RefMut),
        sanitized: false,
        trait_source: None,
        returns_ref: false,
        returns_cow: false,
        return_newtype_wrapper: None,
        has_default_impl: false,
        binding_excluded: false,
        binding_exclusion_reason: None,
        version: Default::default(),
    };
    let mapper = RustMapper;
    let cfg = default_cfg();
    let adapter_bodies = AdapterBodies::default();
    let opaque_types = AHashSet::new();

    let result = gen_method(
        &method,
        &mapper,
        &cfg,
        &typ,
        false,
        &opaque_types,
        &AHashSet::new(),
        &adapter_bodies,
    );

    assert!(result.contains("pub fn try_apply"), "should contain method name");
    assert!(result.contains("&self"), "should use &self receiver");
    assert!(!result.contains("&mut self"), "should not use &mut self");
    // Should return Result<Self, ...>
    assert!(result.contains("Result<Self"), "should return Result<Self>");
    assert!(result.contains("let mut core_self"), "should declare mutable core_self");
    assert!(result.contains("core_self.try_apply("), "should call core method");
    // On success, return the mutated self converted back
    assert!(
        result.contains("Ok(core_self.into())"),
        "should return Ok(core_self.into()) on success"
    );
}