glib_macros/
error_domain_derive.rsuse proc_macro2::TokenStream;
use quote::quote;
use syn::Data;
use crate::utils::{crate_ident_new, gen_enum_from_glib, parse_nested_meta_items, NestedMetaItem};
pub fn impl_error_domain(input: &syn::DeriveInput) -> syn::Result<TokenStream> {
let name = &input.ident;
let enum_variants = match input.data {
Data::Enum(ref e) => &e.variants,
_ => {
return Err(syn::Error::new_spanned(
input,
"#[derive(glib::ErrorDomain)] only supports enums",
))
}
};
let mut domain_name = NestedMetaItem::<syn::LitStr>::new("name")
.required()
.value_required();
let found = parse_nested_meta_items(&input.attrs, "error_domain", &mut [&mut domain_name])?;
if found.is_none() {
return Err(syn::Error::new_spanned(
input,
"#[derive(glib::ErrorDomain)] requires #[error_domain(name = \"domain-name\")]",
));
};
let domain_name = domain_name.value.unwrap();
let crate_ident = crate_ident_new();
let from_glib = gen_enum_from_glib(name, enum_variants);
Ok(quote! {
impl #crate_ident::error::ErrorDomain for #name {
#[inline]
fn domain() -> #crate_ident::Quark {
use #crate_ident::translate::from_glib;
static QUARK: ::std::sync::OnceLock<#crate_ident::Quark> = ::std::sync::OnceLock::new();
*QUARK.get_or_init(|| unsafe {
from_glib(#crate_ident::ffi::g_quark_from_static_string(concat!(#domain_name, "\0") as *const ::core::primitive::str as *const _))
})
}
#[inline]
fn code(self) -> i32 {
self as i32
}
#[inline]
fn from(value: i32) -> ::core::option::Option<Self>
where
Self: ::std::marker::Sized
{
#from_glib
}
}
})
}