c2rs 0.1.0

C Struct to Rust struct
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

use syn::{braced, bracketed, parse::Parse, punctuated::Punctuated, token::Comma, Ident, LitInt};

use syn::token;

use proc_macro::TokenStream;

use quote::quote;

struct Field {
    name: Ident,
    typ: Ident,
    arr: Option<LitInt>,
}

struct Struct {
    name: Ident,
    fields: Punctuated<Field, Comma>,
}

struct Structs {
    structs: Vec<Struct>,
}

impl Parse for Field {
    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
        // type
        let typ: Ident = input.parse()?;

        let mut arr = None;

        if input.peek(token::Bracket) {
            let content;

            bracketed!(content in input);

            let size: syn::LitInt = content.parse()?;

            arr = Some(size);
        }

        let ident: Ident = input.parse()?;

        if input.peek(token::Bracket) {
            let content;

            bracketed!(content in input);

            let size: syn::LitInt = content.parse()?;

            arr = Some(size);
        }

        Ok(Self {
            typ,
            name: ident,
            arr,
        })
    }
}

impl Parse for Struct {
    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
        input.parse::<token::Struct>()?;

        let name = input.parse::<Ident>()?;

        let content;

        braced!(content in input);

        let mut fields = Punctuated::new();

        loop {
            if content.is_empty() {
                break;
            }

            let field: Field = content.parse()?;

            content.parse::<syn::token::Semi>()?;

            fields.push(field);
        }

        input.parse::<syn::token::Semi>()?;

        Ok(Self { name, fields })
    }
}

impl Parse for Structs {
    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
        let mut structs: Vec<Struct> = Vec::new();

        loop {
            if input.is_empty() {
                break;
            }

            let c: Struct = input.parse()?;

            structs.push(c);
        }

        Ok(Structs { structs })
    }
}

#[proc_macro]
pub fn c2rs_def(input: TokenStream) -> TokenStream {
    let structs = syn::parse::<Structs>(input).expect("error");

    let mut rs_structs = Vec::new();

    for c in structs.structs {
        let name = c.name;
        let fields = c.fields;
        let mut rs_fields = Vec::new();

        for field in fields {
            let name = field.name;
            let typ = field.typ;
            let typ = {
                if let Some(arr) = field.arr {
                    quote! {
                        [#typ; #arr]
                    }
                } else {
                    quote! {
                        #typ
                    }
                }
            };

            rs_fields.push(quote! {
                pub #name: #typ
            })
        }

        rs_structs.push(quote! {
            #[allow(unused)]
            #[allow(non_camel_case_types)]
            #[allow(non_snake_case)]
            #[derive(Debug, Clone, Default)]
            #[repr(C)]
            pub struct #name{
                #(#rs_fields), *
            }

            impl #name{

                #[inline]
                pub unsafe fn from_mut_bytes(bytes: *mut u8) -> *mut Self{
                    std::mem::transmute(bytes)
                }

                #[inline]
                pub unsafe fn from_bytes(bytes: *const u8) -> *const Self{
                    std::mem::transmute(bytes)
                }

                #[inline]
                pub fn size() -> usize{
                    std::mem::size_of::<Self>()
                }

            }

        })
    }

    let gen = quote! {
        #(#rs_structs)*
    };

    gen.into()
}