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use proc_easy::EasyAttributes;
use syn::spanned::Spanned;
use crate::{merge_where_clauses, Borrow, Name, OnDrop, OnReplace, WhereClause};
proc_easy::easy_attributes! {
@(edict)
struct ComponentAttributes {
name: Option<Name>,
borrow: Option<Borrow>,
on_drop: Option<OnDrop>,
on_replace: Option<OnReplace>,
where_clauses: Vec<WhereClause>,
}
}
pub fn derive(
input: syn::DeriveInput,
edict_path: &syn::Path,
edict_namespace: &syn::Ident,
) -> syn::Result<proc_macro2::TokenStream> {
let ident = &input.ident;
let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
let attributes = ComponentAttributes::parse_in(edict_namespace, &input.attrs, input.span())?;
let where_clause = merge_where_clauses(where_clause, &attributes.where_clauses);
let fn_name = attributes.name.map(|name| {
let name = name.literal;
Some(quote::quote! {
#[inline]
fn name() -> &'static str {
#name
}
})
});
let on_drop = attributes.on_drop.map(|on_drop| {
let on_drop = &on_drop.function;
quote::quote! {
#[allow(unused_variables)]
#[inline]
fn on_drop(&mut self, entity: #edict_path::entity::EntityId, encoder: #edict_path::action::ActionEncoder<'_>) {
(#on_drop)(self, entity, encoder)
}
}
});
let on_replace = attributes.on_replace.map(|on_replace|{
let on_replace = &on_replace.function;
quote::quote! {
#[allow(unused_variables)]
#[inline]
fn on_replace(&mut self, value: &Self, entity: #edict_path::entity::EntityId, encoder: #edict_path::action::ActionEncoder<'_>) -> bool {
(#on_replace)(self, value, entity, encoder)
}
}
}
);
let insert_borrows = match attributes.borrow {
None => None,
Some(borrow) => {
let mut insert_borrows = quote::quote!();
for target in borrow.targets.iter() {
match target {
syn::Type::TraitObject(trait_object) => {
if trait_object.bounds.len() != 1 {
return Err(syn::Error::new(
target.span(),
"Only dyn traits without markers and lifetimes are supported",
));
}
let bound =
match &trait_object.bounds[0] {
syn::TypeParamBound::Trait(bound) => bound,
_ => return Err(syn::Error::new(
target.span(),
"Only dyn traits without markers and lifetimes are supported",
)),
};
insert_borrows.extend(quote::quote! {
{
#![allow(dead_code)]
struct DispatchBorrowSendSync<T>(DispatchBorrowSend<T>);
struct DispatchBorrowSend<T>(DispatchBorrowSync<T>);
struct DispatchBorrowSync<T>(DispatchBorrow<T>);
struct DispatchBorrow<T>(core::marker::PhantomData<T>);
impl<T> core::ops::Deref for DispatchBorrowSendSync<T> {
type Target = DispatchBorrowSend<T>;
fn deref(&self) -> &DispatchBorrowSend<T> {
&self.0
}
}
impl<T> core::ops::Deref for DispatchBorrowSend<T> {
type Target = DispatchBorrowSync<T>;
fn deref(&self) -> &DispatchBorrowSync<T> {
&self.0
}
}
impl<T> core::ops::Deref for DispatchBorrowSync<T> {
type Target = DispatchBorrow<T>;
fn deref(&self) -> &DispatchBorrow<T> {
&self.0
}
}
impl<T: #bound + Send + Sync + 'static> DispatchBorrowSendSync<T> {
fn insert(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
self.insert_one(extend);
self.0.insert_one(extend);
self.0 .0.insert_one(extend);
self.0 .0 .0.insert_one(extend);
}
fn insert_one(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
extend.extend(Some(#edict_path::component::ComponentBorrow::make(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &(dyn #bound + Send + Sync) {
unsafe { ptr.cast::<T>().as_ref() }
},
core::option::Option::Some(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &mut (dyn #bound + Send + Sync) {
unsafe { ptr.cast::<T>().as_mut() }
},
),
)));
}
}
impl<T: #bound + Send + 'static> DispatchBorrowSend<T> {
fn insert(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
self.insert_one(extend);
self.0 .0.insert_one(extend);
}
fn insert_one(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
extend.extend(Some(#edict_path::component::ComponentBorrow::make(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &(dyn #bound + Send) {
unsafe { ptr.cast::<T>().as_ref() }
},
core::option::Option::Some(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &mut (dyn #bound + Send) {
unsafe { ptr.cast::<T>().as_mut() }
},
),
)));
}
}
impl<T: #bound + Sync + 'static> DispatchBorrowSync<T> {
fn insert(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
self.insert_one(extend);
self.0.insert_one(extend);
}
fn insert_one(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
extend.extend(Some(#edict_path::component::ComponentBorrow::make(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &(dyn #bound + Sync) {
unsafe { ptr.cast::<T>().as_ref() }
},
core::option::Option::Some(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &mut (dyn #bound + Sync) {
unsafe { ptr.cast::<T>().as_mut() }
},
),
)));
}
}
impl<T: #bound + 'static> DispatchBorrow<T> {
fn insert(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
self.insert_one(extend);
}
fn insert_one(
&self,
extend: &mut #edict_path::private::Vec<#edict_path::component::ComponentBorrow>,
) {
extend.extend(Some(#edict_path::component::ComponentBorrow::make(
|ptr: core::ptr::NonNull<u8>, core::marker::PhantomData| -> &dyn #bound {
unsafe { ptr.cast::<T>().as_ref() }
},
core::option::Option::Some(
|ptr: core::ptr::NonNull<u8>,
core::marker::PhantomData|
-> &mut dyn #bound {
unsafe { ptr.cast::<T>().as_mut() }
},
),
)));
}
}
let dispatch = DispatchBorrowSendSync(DispatchBorrowSend(DispatchBorrowSync(
DispatchBorrow(core::marker::PhantomData::<#ident>),
)));
dispatch.insert(&mut output);
}
});
}
_ => {
insert_borrows.extend(quote::quote! {
let dispatch = #edict_path::component::private::DispatchBorrowMut(#edict_path::component::private::DispatchBorrow(core::marker::PhantomData::<(#ident, #target)>));
dispatch.insert(&mut output);
});
}
};
}
Some(insert_borrows)
}
};
let output = quote::quote! {
impl #impl_generics #edict_path::component::Component for #ident #ty_generics
#where_clause
{
#fn_name
#on_drop
#on_replace
fn borrows() -> #edict_path::private::Vec<#edict_path::component::ComponentBorrow> {
let mut output = Vec::new();
output.push(#edict_path::component::ComponentBorrow::auto::<Self>());
#edict_path::borrow_dyn_any!(Self => output);
#insert_borrows
output
}
}
};
Ok(output)
}