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

use crate::config::ToNamingStyle;
use crate::Config;
use interoptopus::lang::c::{CType, CompositeType, Constant, ConstantValue, EnumType, FnPointerType, Function, OpaqueType, PrimitiveType, PrimitiveValue, Variant};
use interoptopus::patterns::callbacks::NamedCallback;
use interoptopus::patterns::TypePattern;
use interoptopus::util::safe_name;

/// Implements [`CTypeConverter`].
#[derive(Clone)]
pub struct Converter {
    pub(crate) config: Config,
}

/// Converts Interoptopus types to C types.
pub trait CTypeConverter {
    fn config(&self) -> &Config;

    /// Converts a primitive (Rust) type to a native C# type name, e.g., `f32` to `float`.
    fn primitive_to_typename(&self, x: &PrimitiveType) -> String;

    /// Converts a Rust enum name such as `Error` to a C# enum name `Error`.
    fn enum_to_typename(&self, x: &EnumType) -> String;

    fn enum_variant_to_name(&self, the_enum: &EnumType, x: &Variant) -> String;

    /// TODO Converts an opaque Rust struct `Context` to a C# struct ``.
    fn opaque_to_typename(&self, opaque: &OpaqueType) -> String;

    /// Converts an Rust struct name `Vec2` to a C# struct name `Vec2`.
    fn composite_to_typename(&self, x: &CompositeType) -> String;

    /// Converts an Rust `fn()` to a C# delegate name such as `InteropDelegate`.
    fn fnpointer_to_typename(&self, x: &FnPointerType) -> String;

    fn named_callback_to_typename(&self, x: &NamedCallback) -> String {
        format!("{}{}", self.config().prefix, x.name().to_naming_style(&self.config().type_naming))
    }

    /// Converts the `u32` part in a Rust paramter `x: u32` to a C# equivalent. Might convert pointers to `out X` or `ref X`.
    fn to_type_specifier(&self, x: &CType) -> String;

    fn const_name_to_name(&self, x: &Constant) -> String;

    fn constant_value_to_value(&self, value: &ConstantValue) -> String;

    fn function_name_to_c_name(&self, function: &Function) -> String;
}

impl CTypeConverter for Converter {
    fn config(&self) -> &Config {
        &self.config
    }

    fn primitive_to_typename(&self, x: &PrimitiveType) -> String {
        match x {
            PrimitiveType::Void => "void".to_string(),
            PrimitiveType::Bool => "bool".to_string(),
            PrimitiveType::U8 => "uint8_t".to_string(),
            PrimitiveType::U16 => "uint16_t".to_string(),
            PrimitiveType::U32 => "uint32_t".to_string(),
            PrimitiveType::U64 => "uint64_t".to_string(),
            PrimitiveType::I8 => "int8_t".to_string(),
            PrimitiveType::I16 => "int16_t".to_string(),
            PrimitiveType::I32 => "int32_t".to_string(),
            PrimitiveType::I64 => "int64_t".to_string(),
            PrimitiveType::F32 => "float".to_string(),
            PrimitiveType::F64 => "double".to_string(),
        }
    }

    fn enum_to_typename(&self, x: &EnumType) -> String {
        format!("{}{}", self.config().prefix, x.rust_name()).to_naming_style(&self.config.type_naming)
    }

    fn enum_variant_to_name(&self, the_enum: &EnumType, x: &Variant) -> String {
        format!(
            "{}{}_{}",
            self.config().prefix,
            the_enum.rust_name().to_naming_style(&self.config.type_naming),
            x.name()
        )
        .to_naming_style(&self.config.enum_variant_naming)
    }

    fn opaque_to_typename(&self, x: &OpaqueType) -> String {
        format!("{}{}", self.config().prefix, x.rust_name()).to_naming_style(&self.config.type_naming)
    }

    fn composite_to_typename(&self, x: &CompositeType) -> String {
        format!("{}{}", self.config().prefix, x.rust_name()).to_naming_style(&self.config.type_naming)
    }

    fn fnpointer_to_typename(&self, x: &FnPointerType) -> String {
        let prefixed = format!("{}fptr", self.config().prefix);
        vec![prefixed, safe_name(&x.internal_name())].join("_")
    }

    fn to_type_specifier(&self, x: &CType) -> String {
        match x {
            CType::Primitive(x) => self.primitive_to_typename(x),
            CType::Enum(x) => self.enum_to_typename(x),
            CType::Opaque(x) => self.opaque_to_typename(x),
            CType::Composite(x) => self.composite_to_typename(x),
            CType::ReadPointer(x) => format!("const {}*", self.to_type_specifier(x)),
            CType::ReadWritePointer(x) => format!("{}*", self.to_type_specifier(x)),
            CType::FnPointer(x) => self.fnpointer_to_typename(x),
            CType::Pattern(TypePattern::CChar) => "char".to_string(),
            CType::Pattern(TypePattern::NamedCallback(x)) => self.named_callback_to_typename(x),
            CType::Pattern(x) => self.to_type_specifier(&x.fallback_type()),
            // TODO: This should be handled in nicer way so that arrays-of-arrays and other thing work properly
            CType::Array(_) => panic!("Arrays need special handling in the writer."),
        }
    }

    fn const_name_to_name(&self, x: &Constant) -> String {
        format!("{}{}", self.config().prefix, x.name()).to_naming_style(&self.config.const_naming)
    }

    fn constant_value_to_value(&self, value: &ConstantValue) -> String {
        match value {
            ConstantValue::Primitive(x) => match x {
                PrimitiveValue::Bool(x) => format!("{}", x),
                PrimitiveValue::U8(x) => format!("{}", x),
                PrimitiveValue::U16(x) => format!("{}", x),
                PrimitiveValue::U32(x) => format!("{}", x),
                PrimitiveValue::U64(x) => format!("{}", x),
                PrimitiveValue::I8(x) => format!("{}", x),
                PrimitiveValue::I16(x) => format!("{}", x),
                PrimitiveValue::I32(x) => format!("{}", x),
                PrimitiveValue::I64(x) => format!("{}", x),
                PrimitiveValue::F32(x) => format!("{}", x),
                PrimitiveValue::F64(x) => format!("{}", x),
            },
        }
    }

    fn function_name_to_c_name(&self, function: &Function) -> String {
        function.name().to_string()
    }
}