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extern crate proc_macro;
mod container_attributes;
mod derive_data;
#[cfg(feature = "documentation")]
mod documentation;
mod enum_utility;
mod field_attributes;
mod from_reflect;
mod impls;
mod reflect_value;
mod registration;
mod trait_reflection;
mod type_uuid;
mod utility;
use crate::derive_data::{ReflectDerive, ReflectMeta, ReflectStruct};
use proc_macro::TokenStream;
use quote::quote;
use reflect_value::ReflectValueDef;
use syn::spanned::Spanned;
use syn::{parse_macro_input, DeriveInput};
pub(crate) static REFLECT_ATTRIBUTE_NAME: &str = "reflect";
pub(crate) static REFLECT_VALUE_ATTRIBUTE_NAME: &str = "reflect_value";
#[proc_macro_derive(Reflect, attributes(reflect, reflect_value, module))]
pub fn derive_reflect(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let derive_data = match ReflectDerive::from_input(&ast) {
Ok(data) => data,
Err(err) => return err.into_compile_error().into(),
};
match derive_data {
ReflectDerive::Struct(struct_data) | ReflectDerive::UnitStruct(struct_data) => {
impls::impl_struct(&struct_data)
}
ReflectDerive::TupleStruct(struct_data) => impls::impl_tuple_struct(&struct_data),
ReflectDerive::Enum(meta) => impls::impl_enum(&meta),
ReflectDerive::Value(meta) => impls::impl_value(&meta),
}
}
#[proc_macro_derive(FromReflect, attributes(reflect))]
pub fn derive_from_reflect(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let derive_data = match ReflectDerive::from_input(&ast) {
Ok(data) => data,
Err(err) => return err.into_compile_error().into(),
};
match derive_data {
ReflectDerive::Struct(struct_data) | ReflectDerive::UnitStruct(struct_data) => {
from_reflect::impl_struct(&struct_data)
}
ReflectDerive::TupleStruct(struct_data) => from_reflect::impl_tuple_struct(&struct_data),
ReflectDerive::Enum(meta) => from_reflect::impl_enum(&meta),
ReflectDerive::Value(meta) => from_reflect::impl_value(&meta),
}
}
#[proc_macro_derive(TypeUuid, attributes(uuid))]
pub fn derive_type_uuid(input: TokenStream) -> TokenStream {
type_uuid::type_uuid_derive(input)
}
#[proc_macro_attribute]
pub fn reflect_trait(args: TokenStream, input: TokenStream) -> TokenStream {
trait_reflection::reflect_trait(&args, input)
}
#[proc_macro]
pub fn impl_reflect_value(input: TokenStream) -> TokenStream {
let def = parse_macro_input!(input as ReflectValueDef);
let meta = ReflectMeta::new(
&def.type_name,
&def.generics,
def.traits.unwrap_or_default(),
);
#[cfg(feature = "documentation")]
let meta = meta.with_docs(documentation::Documentation::from_attributes(&def.attrs));
impls::impl_value(&meta)
}
#[proc_macro]
pub fn impl_reflect_struct(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let derive_data = match ReflectDerive::from_input(&ast) {
Ok(data) => data,
Err(err) => return err.into_compile_error().into(),
};
match derive_data {
ReflectDerive::Struct(struct_data) => {
let impl_struct: proc_macro2::TokenStream = impls::impl_struct(&struct_data).into();
let impl_from_struct: proc_macro2::TokenStream =
from_reflect::impl_struct(&struct_data).into();
TokenStream::from(quote! {
#impl_struct
#impl_from_struct
})
}
ReflectDerive::TupleStruct(..) => syn::Error::new(
ast.span(),
"impl_reflect_struct does not support tuple structs",
)
.into_compile_error()
.into(),
ReflectDerive::UnitStruct(..) => syn::Error::new(
ast.span(),
"impl_reflect_struct does not support unit structs",
)
.into_compile_error()
.into(),
_ => syn::Error::new(ast.span(), "impl_reflect_struct only supports structs")
.into_compile_error()
.into(),
}
}
#[proc_macro]
pub fn impl_from_reflect_value(input: TokenStream) -> TokenStream {
let def = parse_macro_input!(input as ReflectValueDef);
from_reflect::impl_value(&ReflectMeta::new(
&def.type_name,
&def.generics,
def.traits.unwrap_or_default(),
))
}