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|
use quote::quote;
use crate::reflection::field::{generate as generate_field, ReflectionFieldGenOptions};
use crate::util::{find_engine_crate_path, syn_path, SynPathExt};
pub fn generate(input: syn::ItemStruct) -> proc_macro2::TokenStream
{
let engine_crate_path = find_engine_crate_path().unwrap();
let input_ident = input.ident;
let type_reflection_optional = input.generics.params.is_empty();
let mut generics = input.generics;
for type_param in generics.type_params_mut() {
type_param
.bounds
.push(syn::TypeParamBound::Trait(syn::TraitBound {
paren_token: None,
modifier: syn::TraitBoundModifier::None,
lifetimes: None,
path: engine_crate_path.join(syn_path!(reflection::Reflection)),
}));
}
let (impl_generics, type_generics, where_clause) = generics.split_for_impl();
let fields = input
.fields
.into_iter()
.enumerate()
.map(|(field_index, field)| {
generate_field(
&field,
field_index,
&engine_crate_path,
ReflectionFieldGenOptions {
field_vis_override: None,
gen_get_byte_offset: &|field| {
if let Some(field_ident) = &field.ident {
quote! { std::mem::offset_of!(Self, #field_ident) }
} else {
quote! { std::mem::offset_of!(Self, #field_index) }
}
},
type_reflection_optional,
},
)
});
quote! {
unsafe impl #impl_generics #engine_crate_path::reflection::Reflection for
#input_ident #type_generics #where_clause
{
const TYPE_REFLECTION: &#engine_crate_path::reflection::Type =
&const {
#engine_crate_path::reflection::Type::Struct(
#engine_crate_path::reflection::Struct {
fields: &[
#(#fields),*
]
}
)
};
}
}
}
|
