1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use proc_macro2::TokenStream;
4use proc_macro_error::abort_call_site;
5use quote::quote;
6use syn::Data;
7
8use crate::utils::{crate_ident_new, gen_enum_from_glib, parse_nested_meta_items, NestedMetaItem};
9
10pub fn impl_error_domain(input: &syn::DeriveInput) -> TokenStream {
11 let name = &input.ident;
12
13 let enum_variants = match input.data {
14 Data::Enum(ref e) => &e.variants,
15 _ => abort_call_site!("#[derive(glib::ErrorDomain)] only supports enums"),
16 };
17
18 let mut domain_name = NestedMetaItem::<syn::LitStr>::new("name")
19 .required()
20 .value_required();
21 let found = parse_nested_meta_items(&input.attrs, "error_domain", &mut [&mut domain_name]);
22
23 match found {
24 Ok(None) => {
25 abort_call_site!(
26 "#[derive(glib::ErrorDomain)] requires #[error_domain(name = \"domain-name\")]"
27 )
28 }
29 Err(e) => return e.to_compile_error(),
30 Ok(_) => (),
31 };
32 let domain_name = domain_name.value.unwrap();
33 let crate_ident = crate_ident_new();
34
35 let from_glib = gen_enum_from_glib(name, enum_variants);
36
37 quote! {
38 impl #crate_ident::error::ErrorDomain for #name {
39 #[inline]
40 fn domain() -> #crate_ident::Quark {
41 use #crate_ident::translate::from_glib;
42
43 static QUARK: #crate_ident::once_cell::sync::Lazy<#crate_ident::Quark> =
44 #crate_ident::once_cell::sync::Lazy::new(|| unsafe {
45 from_glib(#crate_ident::ffi::g_quark_from_static_string(concat!(#domain_name, "\0") as *const ::core::primitive::str as *const _))
46 });
47 *QUARK
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