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structs.rs
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structs.rs
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use crate::impls::impl_typed;
use crate::ReflectStruct;
use proc_macro::TokenStream;
use quote::quote;
use syn::{Index, Member};
/// Implements `Struct`, `GetTypeRegistration`, and `Reflect` for the given derive data.
pub(crate) fn impl_struct(reflect_struct: &ReflectStruct) -> TokenStream {
let bevy_reflect_path = reflect_struct.meta().bevy_reflect_path();
let struct_name = reflect_struct.meta().type_name();
let field_names = reflect_struct
.active_fields()
.map(|field| {
field
.data
.ident
.as_ref()
.map(|i| i.to_string())
.unwrap_or_else(|| field.index.to_string())
})
.collect::<Vec<String>>();
let field_idents = reflect_struct
.active_fields()
.map(|field| {
field
.data
.ident
.as_ref()
.map(|ident| Member::Named(ident.clone()))
.unwrap_or_else(|| Member::Unnamed(Index::from(field.index)))
})
.collect::<Vec<_>>();
let field_types = reflect_struct.active_types();
let field_count = field_idents.len();
let field_indices = (0..field_count).collect::<Vec<usize>>();
let hash_fn = reflect_struct
.meta()
.traits()
.get_hash_impl(bevy_reflect_path);
let debug_fn = reflect_struct.meta().traits().get_debug_impl();
let partial_eq_fn = reflect_struct.meta()
.traits()
.get_partial_eq_impl(bevy_reflect_path)
.unwrap_or_else(|| {
quote! {
fn reflect_partial_eq(&self, value: &dyn #bevy_reflect_path::Reflect) -> Option<bool> {
#bevy_reflect_path::struct_partial_eq(self, value)
}
}
});
let typed_impl = impl_typed(
struct_name,
reflect_struct.meta().generics(),
quote! {
let fields = [
#(#bevy_reflect_path::NamedField::new::<#field_types, _>(#field_names),)*
];
let info = #bevy_reflect_path::StructInfo::new::<Self>(&fields);
#bevy_reflect_path::TypeInfo::Struct(info)
},
bevy_reflect_path,
);
let get_type_registration_impl = reflect_struct.get_type_registration();
let (impl_generics, ty_generics, where_clause) =
reflect_struct.meta().generics().split_for_impl();
TokenStream::from(quote! {
#get_type_registration_impl
#typed_impl
impl #impl_generics #bevy_reflect_path::Struct for #struct_name #ty_generics #where_clause {
fn field(&self, name: &str) -> Option<&dyn #bevy_reflect_path::Reflect> {
match name {
#(#field_names => Some(&self.#field_idents),)*
_ => None,
}
}
fn field_mut(&mut self, name: &str) -> Option<&mut dyn #bevy_reflect_path::Reflect> {
match name {
#(#field_names => Some(&mut self.#field_idents),)*
_ => None,
}
}
fn field_at(&self, index: usize) -> Option<&dyn #bevy_reflect_path::Reflect> {
match index {
#(#field_indices => Some(&self.#field_idents),)*
_ => None,
}
}
fn field_at_mut(&mut self, index: usize) -> Option<&mut dyn #bevy_reflect_path::Reflect> {
match index {
#(#field_indices => Some(&mut self.#field_idents),)*
_ => None,
}
}
fn name_at(&self, index: usize) -> Option<&str> {
match index {
#(#field_indices => Some(#field_names),)*
_ => None,
}
}
fn field_len(&self) -> usize {
#field_count
}
fn iter_fields(&self) -> #bevy_reflect_path::FieldIter {
#bevy_reflect_path::FieldIter::new(self)
}
fn clone_dynamic(&self) -> #bevy_reflect_path::DynamicStruct {
let mut dynamic = #bevy_reflect_path::DynamicStruct::default();
dynamic.set_name(self.type_name().to_string());
#(dynamic.insert_boxed(#field_names, self.#field_idents.clone_value());)*
dynamic
}
}
impl #impl_generics #bevy_reflect_path::Reflect for #struct_name #ty_generics #where_clause {
#[inline]
fn type_name(&self) -> &str {
std::any::type_name::<Self>()
}
#[inline]
fn get_type_info(&self) -> &'static #bevy_reflect_path::TypeInfo {
<Self as #bevy_reflect_path::Typed>::type_info()
}
#[inline]
fn into_any(self: Box<Self>) -> Box<dyn std::any::Any> {
self
}
#[inline]
fn as_any(&self) -> &dyn std::any::Any {
self
}
#[inline]
fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
self
}
#[inline]
fn as_reflect(&self) -> &dyn #bevy_reflect_path::Reflect {
self
}
#[inline]
fn as_reflect_mut(&mut self) -> &mut dyn #bevy_reflect_path::Reflect {
self
}
#[inline]
fn clone_value(&self) -> Box<dyn #bevy_reflect_path::Reflect> {
Box::new(#bevy_reflect_path::Struct::clone_dynamic(self))
}
#[inline]
fn set(&mut self, value: Box<dyn #bevy_reflect_path::Reflect>) -> Result<(), Box<dyn #bevy_reflect_path::Reflect>> {
*self = value.take()?;
Ok(())
}
#[inline]
fn apply(&mut self, value: &dyn #bevy_reflect_path::Reflect) {
if let #bevy_reflect_path::ReflectRef::Struct(struct_value) = value.reflect_ref() {
for (i, value) in struct_value.iter_fields().enumerate() {
let name = struct_value.name_at(i).unwrap();
#bevy_reflect_path::Struct::field_mut(self, name).map(|v| v.apply(value));
}
} else {
panic!("Attempted to apply non-struct type to struct type.");
}
}
fn reflect_ref(&self) -> #bevy_reflect_path::ReflectRef {
#bevy_reflect_path::ReflectRef::Struct(self)
}
fn reflect_mut(&mut self) -> #bevy_reflect_path::ReflectMut {
#bevy_reflect_path::ReflectMut::Struct(self)
}
#hash_fn
#partial_eq_fn
#debug_fn
}
})
}