Newer
Older
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
// Copyright 2021 Axiom-Team
//
// This file is part of Substrate-Libre-Currency.
//
// Substrate-Libre-Currency is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, version 3 of the License.
//
// Substrate-Libre-Currency 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with Substrate-Libre-Currency. If not, see <https://www.gnu.org/licenses/>.
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::TokenStream;
use quote::{quote, quote_spanned};
use syn::{parse_macro_input, spanned::Spanned, Fields, Ident, ItemStruct, Type};
fn snake_to_class_case(ident: &Ident) -> Ident {
let span = ident.span();
let mut acc = String::new();
let mut prev = '_';
for ch in ident.to_string().chars() {
if ch != '_' {
if prev == '_' {
for chu in ch.to_uppercase() {
acc.push(chu);
}
} else if prev.is_uppercase() {
for chl in ch.to_lowercase() {
acc.push(chl);
}
} else {
acc.push(ch);
}
}
prev = ch;
}
Ident::new(&acc, span)
}
#[proc_macro_attribute]
pub fn generate_fields_getters(_: TokenStream, input: TokenStream) -> TokenStream {
let item_struct = parse_macro_input!(input as ItemStruct);
let ItemStruct { fields, .. } = item_struct.clone();
let mut class_idents: Vec<Ident> = Vec::new();
let mut idents: Vec<Ident> = Vec::new();
let mut types: Vec<Type> = Vec::new();
if let Fields::Named(named_fields) = fields {
let named_fields = named_fields.named;
for field in named_fields.iter() {
if let Some(ref ident) = field.ident {
class_idents.push(snake_to_class_case(ident));
idents.push(ident.clone());
types.push(field.ty.clone());
}
}
(quote! {
#item_struct
#(
pub struct #class_idents<T: Config>(core::marker::PhantomData<T>);
impl<T: Config> Get<T::#types> for #class_idents<T> {
fn get() -> T::#types {
Pallet::<T>::parameters().#idents
}
}
)*
})
.into()
} else {
(quote_spanned! {
fields.span() => compile_error("Expected named fields");
})
.into()
}
}