1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use proc_macro2::TokenStream;
4use quote::quote;
5use syn::Data;
6
7use crate::utils::{crate_ident_new, gen_enum_from_glib, parse_nested_meta_items, NestedMetaItem};
8
9pub fn impl_error_domain(input: &syn::DeriveInput) -> syn::Result<TokenStream> {
10 let name = &input.ident;
11
12 let enum_variants = match input.data {
13 Data::Enum(ref e) => &e.variants,
14 _ => {
15 return Err(syn::Error::new_spanned(
16 input,
17 "#[derive(glib::ErrorDomain)] only supports enums",
18 ))
19 }
20 };
21
22 let mut domain_name = NestedMetaItem::<syn::LitStr>::new("name")
23 .required()
24 .value_required();
25 let found = parse_nested_meta_items(&input.attrs, "error_domain", &mut [&mut domain_name])?;
26
27 if found.is_none() {
28 return Err(syn::Error::new_spanned(
29 input,
30 "#[derive(glib::ErrorDomain)] requires #[error_domain(name = \"domain-name\")]",
31 ));
32 };
33 let domain_name = domain_name.value.unwrap();
34 let crate_ident = crate_ident_new();
35
36 let from_glib = gen_enum_from_glib(name, enum_variants);
37
38 Ok(quote! {
39 impl #crate_ident::error::ErrorDomain for #name {
40 #[inline]
41 fn domain() -> #crate_ident::Quark {
42 use #crate_ident::translate::from_glib;
43
44 static QUARK: ::std::sync::OnceLock<#crate_ident::Quark> = ::std::sync::OnceLock::new();
45 *QUARK.get_or_init(|| unsafe {
46 from_glib(#crate_ident::ffi::g_quark_from_static_string(concat!(#domain_name, "\0") as *const ::core::primitive::str as *const _))
47 })
48 }
49
50 #[inline]
51 fn code(self) -> i32 {
52 self as i32
53 }
54
55 #[inline]
56 fn from(value: i32) -> ::core::option::Option<Self>
57 where
58 Self: ::std::marker::Sized
59 {
60 #from_glib
61 }
62 }
63 })
64}
65