glib_macros/
error_domain_derive.rs

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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}
glib_macros/error_domain_derive.rs

glib_macros/
error_domain_derive.rs
