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
|
// Copyright 2024 Gabriel Bjørnager Jensen.
//
// This file is part of bZipper.
//
// bZipper is free software: you can redistribute
// it and/or modify it under the terms of the GNU
// Lesser General Public License as published by
// the Free Software Foundation, either version 3
// of the License, or (at your option) any later
// version.
//
// bZipper is distributed in the hope that it will
// be useful, but WITHOUT ANY WARRANTY; without
// even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Less-
// er General Public License along with bZipper. If
// not, see <https://www.gnu.org/licenses/>.
#![doc(html_logo_url = "https://gitlab.com/bjoernager/bzipper/-/raw/master/doc-icon.svg")]
//! This crate implements procedural macros for [`bZipper`](https://crates.io/crates/bzipper/).
use proc_macro::TokenStream;
use quote::quote;
use syn::{Data, DeriveInput};
macro_rules! use_mod {
($vis:vis $name:ident) => {
mod $name;
$vis use $name::*;
};
}
pub(crate) use use_mod;
use_mod!(discriminant);
use_mod!(discriminant_iter);
use_mod!(generic_name);
mod impls;
#[proc_macro_derive(Decode)]
pub fn derive_decode(input: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(input as DeriveInput);
let impl_body = match input.data {
Data::Enum( ref data) => impls::decode_enum( data),
Data::Struct(ref data) => impls::decode_struct(data),
Data::Union(..) => panic!("unions cannot derive `Decode`"),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Decode for #ty_name<#generic_names>
#generic_where {
#impl_body
}
};
//panic!("{output}");
output.into()
}
#[proc_macro_derive(Encode)]
pub fn derive_encode(input: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(input as DeriveInput);
let impl_body = match input.data {
Data::Enum( ref data) => impls::encode_enum( data),
Data::Struct(ref data) => impls::encode_struct(data),
Data::Union(..) => panic!("unions cannot derive `Encode`"),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Encode for #ty_name<#generic_names>
#generic_where {
#impl_body
}
};
//panic!("{output}");
output.into()
}
#[proc_macro_derive(SizedEncode)]
pub fn derive_sized_encode(input: TokenStream) -> TokenStream {
let input = syn::parse_macro_input!(input as DeriveInput);
let encode_impl_body = match input.data {
Data::Enum( ref data) => impls::encode_enum( data),
Data::Struct(ref data) => impls::encode_struct(data),
Data::Union(..) => panic!("unions can neither derive `Encode` nor `SizedEncode`"),
};
let sized_encode_impl_body = match input.data {
Data::Enum( ref data) => impls::sized_encode_enum( data),
Data::Struct(ref data) => impls::sized_encode_struct(data),
Data::Union(..) => unreachable!(),
};
let ty_name = &input.ident;
let generic_params = &input.generics.params;
let generic_where = &input.generics.where_clause;
let generic_names = GenericName::extract_from(&input.generics);
let output = quote! {
impl<#generic_params> ::bzipper::Encode for #ty_name<#generic_names>
#generic_where {
#encode_impl_body
}
unsafe impl<#generic_params> ::bzipper::SizedEncode for #ty_name<#generic_names>
#generic_where {
#sized_encode_impl_body
}
};
//panic!("{output}");
output.into()
}
|
