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

use std::collections::HashSet;

use cfg_expr::targets::TargetInfo;
use cfg_expr::{Expression, Predicate};
use syn::Attribute;

use crate::binding_module::CargoFeature;

pub(crate) fn is_primitive(name: &str) -> bool {
    name == "u8"
        || name == "u16"
        || name == "u32"
        || name == "u64"
        || name == "i8"
        || name == "i16"
        || name == "i32"
        || name == "i64"
        || name == "f32"
        || name == "f64"
        || name == "isize"
        || name == "usize"
        || name == "bool"
}

#[derive(Debug, Clone)]
pub struct BuildContext {
    current_target_info: &'static TargetInfo,
    features: Vec<CargoFeature>,
    target_features: Vec<String>,
}

impl BuildContext {
    pub fn new(
        current_target_info: &'static TargetInfo,
        features: Vec<CargoFeature>,
        target_features: Vec<String>,
    ) -> Self {
        Self {
            current_target_info,
            features,
            target_features,
        }
    }

    pub(crate) fn check_cfg_attrs<T>(&self, attrs: &T) -> bool
    where
        for<'a> &'a T: IntoIterator<Item = &'a Attribute>,
    {
        attrs
            .into_iter()
            .map(|attr| {
                let cfg = match &attr.meta {
                    syn::Meta::List(val) => val.tokens.to_string(),
                    _ => panic!("Invalid cfg attribute"),
                };

                let required_cfg = Expression::parse(&cfg).expect("Invalid cfg attribute");

                required_cfg.eval(|pred| match pred {
                    Predicate::Target(tp) => tp.matches(self.current_target_info),
                    Predicate::Feature(feature) => self
                        .features
                        .iter()
                        .any(|val| *val == CargoFeature::new(feature)),
                    Predicate::TargetFeature(target_feature) => {
                        self.target_features.iter().any(|val| val == target_feature)
                    }
                    _ => panic!("Unsupported cfg value"),
                })
            })
            .all(|el| el)
    }
}

#[derive(Debug, Default)]
struct NameTracker {
    known: HashSet<String>,
    unknown: HashSet<String>,
}

impl NameTracker {
    pub(crate) fn add_unknown(&mut self, name: String) {
        if !self.known.iter().any(|v| v == &name) {
            self.unknown.insert(name);
        }
    }

    pub(crate) fn add_known(&mut self, name: String) {
        self.unknown.retain(|v| v != &name);
        self.known.insert(name);
    }
}

#[derive(Debug, Default)]
pub struct NamesTracker {
    traits: NameTracker,
    custom_types: NameTracker,
}

impl NamesTracker {
    pub(crate) fn add_known_trait(&mut self, name: String) {
        self.traits.add_known(name)
    }

    pub(crate) fn add_unknown_trait(&mut self, name: String) {
        self.traits.add_unknown(name)
    }

    pub(crate) fn add_known_custom_type(&mut self, name: String) {
        self.custom_types.add_known(name)
    }

    pub(crate) fn add_unknown_custom_type(&mut self, name: String) {
        self.custom_types.add_unknown(name)
    }

    pub(crate) fn get_unknown(&self) -> Vec<String> {
        let mut result = vec![];
        result.extend(self.custom_types.unknown.iter().cloned());
        result.extend(self.traits.unknown.iter().cloned());
        result
    }
}

#[cfg(test)]
pub(crate) mod helpers {
    use cfg_expr::targets::get_builtin_target_by_triple;
    use syn::ItemEnum;

    use crate::enum_helpers::get_enums_from_module;
    use crate::utils::BuildContext;

    pub fn get_context() -> BuildContext {
        BuildContext {
            current_target_info: get_builtin_target_by_triple("x86_64-apple-darwin").unwrap(),
            features: vec![],
            target_features: vec![],
        }
    }

    pub fn get_enum_item() -> ItemEnum {
        let rust_code = "
mod ffi {
    enum En1 {
        V1,
        V2,
    }
}
        ";
        let context = get_context();
        let module = syn::parse_str(rust_code).unwrap();
        get_enums_from_module(&module, &context).unwrap().remove(0)
    }
}