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use std::{fmt, io::Write};
use proc_macro::TokenStream;
use syn::DeriveInput;
use quote::ToTokens;
fn _rustfmt<C: fmt::Display>(code: C) -> String{
let code = format!("{}", code);
let mut child = ::std::process::Command::new("rustfmt")
.stdin(::std::process::Stdio::piped())
.stdout(::std::process::Stdio::piped())
.spawn()
.expect("Failed to format source snippet");
{
let stdin = child.stdin.as_mut().expect("Failed to open stdin");
stdin.write_all(code.as_bytes()).expect("Failed to write to stdin");
}
let out = child.wait_with_output().expect("Failed to format source snippet").stdout;
String::from_utf8_lossy(&out).to_string()
}
pub fn impl_filter(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
let lifetime = &ast.generics.lifetimes().next().unwrap().lifetime;
let struct_data = match &ast.data{
&syn::Data::Enum(_) => panic!("Can't be derived for enums"),
&syn::Data::Struct(ref struct_data) => struct_data,
&syn::Data::Union(ref _union_data) => panic!("Can't be derived for unions"),
};
let fieldss = struct_data.fields.iter().map(|f| &f.ident).collect::<Vec<_>>();
let fields = &fieldss;
let fields2 = &fieldss;
let types = struct_data.fields.iter().map(|f| &f.ty).collect::<Vec<_>>();
let types = &types;
let first_type = types.first().unwrap();
let raw_type_generics = struct_data.fields.iter()
.map(|f| if let syn::Type::Path(syn::TypePath{path, ..}) = &f.ty
{
let segment = path.segments.last().unwrap();
let ty = &segment.ident;
let generics = &segment.arguments;
let mut p = syn::punctuated::Punctuated::<_, syn::token::Colon2>::new();
p.push(ty.clone().into_token_stream());
if !generics.is_empty() {
p.push(generics.clone().into_token_stream());
}
p
}else if let syn::Type::Tuple(_) = &f.ty {
if let Some(ident) = f.ident.as_ref(){
panic!("Field {} is a tuple. Only rinecs operators supported as Filter fields", ident);
}else{
unreachable!()
}
}else{
if let Some(ident) = f.ident.as_ref(){
panic!("Can't understand type for field {}. Only rinecs operators supported as Filter fields", ident);
}else{
unreachable!()
}
}).collect::<Vec<_>>();
let raw_type_generics = &raw_type_generics;
let crate_name = match super::rinecs_crate_name(){
Ok(crate_name) => crate_name,
Err(err) => return err.to_compile_error().into(),
};
let repeat_crate_name = &vec![&crate_name; types.len()];
let gen = quote! {
impl #impl_generics #crate_name::operators::FromComponent<#lifetime, #name #ty_generics> for #name #ty_generics #where_clause{
fn from_component(component: #name #ty_generics) -> Self {
component
}
}
impl #impl_generics #crate_name::operators::filter::FilterFrom<(#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::ComponentsRef),*)> for #name #ty_generics #where_clause {
fn filter_from(t: (#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::ComponentsRef),*)) -> Self {
use #crate_name::FromComponent;
let (#(#fields),*) = t;
#name{
#(
#fields: #raw_type_generics ::from_component(#fields2)
),*
}
}
}
impl #impl_generics #crate_name::UnorderedData<#lifetime> for #name #ty_generics #where_clause {
type Iter = #crate_name::operators::filter::FilterIter<
#lifetime,
Self,
(#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::Storage),*),
>;
type IterMut = #crate_name::operators::filter::FilterIter<
#lifetime,
Self,
(#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::Storage),*),
>;
type Components = (#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::Components),*);
type ComponentsRef = Self;
type Storage = #crate_name::operators::filter::FilterStorage<
#lifetime,
Self,
(#(<#types as #repeat_crate_name::UnorderedData<#lifetime>>::Storage),*),
>;
fn query_mask<E: #crate_name::entity::EntitiesStorage>(entities: &E) -> #crate_name::Bitmask {
#(#raw_type_generics ::query_mask(entities)) | *
}
fn into_iter<E: #crate_name::entity::EntitiesStorage>(entities: & #lifetime E) -> Self::Iter{
#crate_name::operators::filter::FilterIter::new(Self::storage(entities))
}
fn into_iter_mut<E: #crate_name::entity::EntitiesStorage>(entities: & #lifetime E) -> Self::IterMut{
#crate_name::operators::filter::FilterIter::new(Self::storage(entities))
}
fn storage<E: #crate_name::entity::EntitiesStorage>(entities: & #lifetime E) -> Option<Self::Storage>{
let __storages = (#( #raw_type_generics ::storage(entities)?),*);
let ids = entities.entities_for_mask(
Self::query_mask(entities),
&__storages
);
Some(#crate_name::operators::filter::FilterStorage::new(
__storages,
ids,
))
}
}
impl #impl_generics #crate_name::DataAccesses for #name #ty_generics #where_clause {
fn reads() -> Vec<std::any::TypeId> {
let mut reads = vec![];
#(
reads.extend_from_slice(&<#types as #repeat_crate_name::DataAccesses>::reads());
)*
reads
}
fn writes() -> Vec<std::any::TypeId> {
let mut writes = vec![];
#(
writes.extend_from_slice(&<#types as #repeat_crate_name::DataAccesses>::writes());
)*
writes
}
}
unsafe impl #impl_generics #crate_name::operators::SafeIter<#lifetime> for #name #ty_generics
where #(#types: #crate_name::operators::SafeIter<#lifetime>),*
{}
unsafe impl #impl_generics #crate_name::operators::SafeStreamingIter<#lifetime> for #name #ty_generics
where #first_type: #crate_name::operators::SafeStreamingIter<#lifetime>
{}
impl<#lifetime, '_filter_lifetimed_> #crate_name::operators::filter::Filter<'_filter_lifetimed_> for #name #ty_generics #where_clause {
type Lifetimed = #name<'_filter_lifetimed_>;
}
};
TokenStream::from(gen)
}