extern crate proc_macro;
use std::collections::HashSet;
use proc_macro::TokenStream;
use quote::{
format_ident,
quote,
};
use syn::{
parse_macro_input,
ItemImpl,
Type,
TypePath,
TypeTuple,
};
#[proc_macro_attribute]
pub fn partial_derive_state(_: TokenStream, input: TokenStream) -> TokenStream {
let impl_block: syn::ItemImpl = parse_macro_input!(input as syn::ItemImpl);
let has_create_fn = impl_block
.items
.iter()
.any(|item| matches!(item, syn::ImplItem::Fn(method) if method.sig.ident == "create"));
let parent_dependencies = impl_block
.items
.iter()
.find_map(|item| {
if let syn::ImplItem::Type(syn::ImplItemType { ident, ty, .. }) = item {
(ident == "ParentDependencies").then_some(ty)
} else {
None
}
})
.expect("ParentDependencies must be defined");
let child_dependencies = impl_block
.items
.iter()
.find_map(|item| {
if let syn::ImplItem::Type(syn::ImplItemType { ident, ty, .. }) = item {
(ident == "ChildDependencies").then_some(ty)
} else {
None
}
})
.expect("ChildDependencies must be defined");
let node_dependencies = impl_block
.items
.iter()
.find_map(|item| {
if let syn::ImplItem::Type(syn::ImplItemType { ident, ty, .. }) = item {
(ident == "NodeDependencies").then_some(ty)
} else {
None
}
})
.expect("NodeDependencies must be defined");
let this_type = &impl_block.self_ty;
let this_type = extract_type_path(this_type)
.unwrap_or_else(|| panic!("Self must be a type path, found {}", quote!(#this_type)));
let mut combined_dependencies = HashSet::new();
let self_path: TypePath = syn::parse_quote!(Self);
let parent_dependencies = match extract_tuple(parent_dependencies) {
Some(tuple) => {
let mut parent_dependencies = Vec::new();
for type_ in &tuple.elems {
let mut type_ = extract_type_path(type_).unwrap_or_else(|| {
panic!(
"ParentDependencies must be a tuple of type paths, found {}",
quote!(#type_)
)
});
if type_ == self_path {
type_ = this_type.clone();
}
combined_dependencies.insert(type_.clone());
parent_dependencies.push(type_);
}
parent_dependencies
}
_ => panic!(
"ParentDependencies must be a tuple, found {}",
quote!(#parent_dependencies)
),
};
let child_dependencies = match extract_tuple(child_dependencies) {
Some(tuple) => {
let mut child_dependencies = Vec::new();
for type_ in &tuple.elems {
let mut type_ = extract_type_path(type_).unwrap_or_else(|| {
panic!(
"ChildDependencies must be a tuple of type paths, found {}",
quote!(#type_)
)
});
if type_ == self_path {
type_ = this_type.clone();
}
combined_dependencies.insert(type_.clone());
child_dependencies.push(type_);
}
child_dependencies
}
_ => panic!(
"ChildDependencies must be a tuple, found {}",
quote!(#child_dependencies)
),
};
let node_dependencies = match extract_tuple(node_dependencies) {
Some(tuple) => {
let mut node_dependencies = Vec::new();
for type_ in &tuple.elems {
let mut type_ = extract_type_path(type_).unwrap_or_else(|| {
panic!(
"NodeDependencies must be a tuple of type paths, found {}",
quote!(#type_)
)
});
if type_ == self_path {
type_ = this_type.clone();
}
combined_dependencies.insert(type_.clone());
node_dependencies.push(type_);
}
node_dependencies
}
_ => panic!(
"NodeDependencies must be a tuple, found {}",
quote!(#node_dependencies)
),
};
combined_dependencies.insert(this_type.clone());
let combined_dependencies: Vec<_> = combined_dependencies.into_iter().collect();
let parent_dependancies_idxes: Vec<_> = parent_dependencies
.iter()
.filter_map(|ident| combined_dependencies.iter().position(|i| i == ident))
.collect();
let child_dependencies_idxes: Vec<_> = child_dependencies
.iter()
.filter_map(|ident| combined_dependencies.iter().position(|i| i == ident))
.collect();
let node_dependencies_idxes: Vec<_> = node_dependencies
.iter()
.filter_map(|ident| combined_dependencies.iter().position(|i| i == ident))
.collect();
let this_type_idx = combined_dependencies
.iter()
.enumerate()
.find_map(|(i, ident)| (this_type == *ident).then_some(i))
.unwrap();
let this_view = format_ident!("__data{}", this_type_idx);
let combined_dependencies_quote = combined_dependencies.iter().map(|ident| {
if ident == &this_type {
quote! {shipyard::ViewMut<#ident>}
} else {
quote! {shipyard::View<#ident>}
}
});
let combined_dependencies_quote = quote!((#(#combined_dependencies_quote,)*));
let ItemImpl {
attrs,
defaultness,
unsafety,
impl_token,
generics,
trait_,
self_ty,
items,
..
} = impl_block;
let for_ = trait_.as_ref().map(|t| t.2);
let trait_ = trait_.map(|t| t.1);
let split_views: Vec<_> = (0..combined_dependencies.len())
.map(|i| {
let ident = format_ident!("__data{}", i);
if i == this_type_idx {
quote! {mut #ident}
} else {
quote! {#ident}
}
})
.collect();
let node_view = node_dependencies_idxes
.iter()
.map(|i| format_ident!("__data{}", i))
.collect::<Vec<_>>();
let get_node_view = {
if node_dependencies.is_empty() {
quote! {
let raw_node = ();
}
} else {
let temps = (0..node_dependencies.len())
.map(|i| format_ident!("__temp{}", i))
.collect::<Vec<_>>();
quote! {
let raw_node: (#(*const #node_dependencies,)*) = {
let (#(#temps,)*) = (#(&#node_view,)*).get(id).unwrap_or_else(|err| panic!("Failed to get node view {:?}", err));
(#(#temps as *const _,)*)
};
}
}
};
let deref_node_view = {
if node_dependencies.is_empty() {
quote! {
let node = raw_node;
}
} else {
let indexes = (0..node_dependencies.len()).map(syn::Index::from);
quote! {
let node = unsafe { (#(freya_native_core::prelude::DependancyView::new(&*raw_node.#indexes),)*) };
}
}
};
let parent_view = parent_dependancies_idxes
.iter()
.map(|i| format_ident!("__data{}", i))
.collect::<Vec<_>>();
let get_parent_view = {
if parent_dependencies.is_empty() {
quote! {
let raw_parent = tree.parent_id_advanced(id, Self::TRAVERSE_SHADOW_DOM).map(|_| ());
}
} else {
let temps = (0..parent_dependencies.len())
.map(|i| format_ident!("__temp{}", i))
.collect::<Vec<_>>();
quote! {
let raw_parent = tree.parent_id_advanced(id, Self::TRAVERSE_SHADOW_DOM).and_then(|parent_id| {
let raw_parent: Option<(#(*const #parent_dependencies,)*)> = (#(&#parent_view,)*).get(parent_id).ok().map(|c| {
let (#(#temps,)*) = c;
(#(#temps as *const _,)*)
});
raw_parent
});
}
}
};
let deref_parent_view = {
if parent_dependencies.is_empty() {
quote! {
let parent = raw_parent;
}
} else {
let indexes = (0..parent_dependencies.len()).map(syn::Index::from);
quote! {
let parent = unsafe { raw_parent.map(|raw_parent| (#(freya_native_core::prelude::DependancyView::new(&*raw_parent.#indexes),)*)) };
}
}
};
let child_view = child_dependencies_idxes
.iter()
.map(|i| format_ident!("__data{}", i))
.collect::<Vec<_>>();
let get_child_view = {
if child_dependencies.is_empty() {
quote! {
let raw_children: Vec<_> = tree.children_ids_advanced(id, Self::TRAVERSE_SHADOW_DOM).into_iter().map(|_| ()).collect();
}
} else {
let temps = (0..child_dependencies.len())
.map(|i| format_ident!("__temp{}", i))
.collect::<Vec<_>>();
quote! {
let raw_children: Vec<_> = tree.children_ids_advanced(id, Self::TRAVERSE_SHADOW_DOM).into_iter().filter_map(|id| {
let raw_children: Option<(#(*const #child_dependencies,)*)> = (#(&#child_view,)*).get(id).ok().map(|c| {
let (#(#temps,)*) = c;
(#(#temps as *const _,)*)
});
raw_children
}).collect();
}
}
};
let deref_child_view = {
if child_dependencies.is_empty() {
quote! {
let children = raw_children;
}
} else {
let indexes = (0..child_dependencies.len()).map(syn::Index::from);
quote! {
let children = unsafe { raw_children.iter().map(|raw_children| (#(freya_native_core::prelude::DependancyView::new(&*raw_children.#indexes),)*)).collect::<Vec<_>>() };
}
}
};
let trait_generics = trait_
.as_ref()
.unwrap()
.segments
.last()
.unwrap()
.arguments
.clone();
let create_fn = (!has_create_fn).then(|| {
quote! {
fn create<'a>(
node_view: freya_native_core::prelude::NodeView # trait_generics,
node: <Self::NodeDependencies as Dependancy>::ElementBorrowed<'a>,
parent: Option<<Self::ParentDependencies as Dependancy>::ElementBorrowed<'a>>,
children: Vec<<Self::ChildDependencies as Dependancy>::ElementBorrowed<'a>>,
context: &freya_native_core::prelude::SendAnyMap,
) -> Self {
let mut myself = Self::default();
myself.update(node_view, node, parent, children, context);
myself
}
}
});
quote!(
#(#attrs)*
#defaultness #unsafety #impl_token #generics #trait_ #for_ #self_ty {
#create_fn
#(#items)*
fn workload_system(type_id: std::any::TypeId, dependants: std::sync::Arc<freya_native_core::prelude::Dependants>, pass_direction: freya_native_core::prelude::PassDirection) -> freya_native_core::exports::shipyard::WorkloadSystem {
use freya_native_core::exports::shipyard::{IntoWorkloadSystem, Get, AddComponent};
use freya_native_core::tree::TreeRef;
use freya_native_core::prelude::{NodeType, NodeView};
let node_mask = Self::NODE_MASK.build();
(move |data: #combined_dependencies_quote, run_view: freya_native_core::prelude::RunPassView #trait_generics| {
let (#(#split_views,)*) = data;
let tree = run_view.tree.clone();
let node_types = run_view.node_type.clone();
freya_native_core::prelude::run_pass(type_id, &dependants, pass_direction, run_view, |id, context, height| {
let node_data: &NodeType<_> = node_types.get(id).unwrap_or_else(|err| panic!("Failed to get node type {:?}", err));
if node_data.is_text() {
return false;
}
let raw_myself: Option<*mut Self> = (&mut #this_view).get(id).ok().map(|c| c as *mut _);
#get_node_view
#get_parent_view
#get_child_view
let myself: Option<&mut Self> = unsafe { raw_myself.map(|val| &mut *val) };
#deref_node_view
#deref_parent_view
#deref_child_view
let view = NodeView::new(id, node_data, &node_mask, height);
if let Some(myself) = myself {
myself
.update(view, node, parent, children, context)
}
else {
(&mut #this_view).add_component_unchecked(
id,
Self::create(view, node, parent, children, context));
true
}
})
}).into_workload_system().unwrap()
}
}
)
.into()
}
fn extract_tuple(ty: &Type) -> Option<TypeTuple> {
match ty {
Type::Tuple(tuple) => Some(tuple.clone()),
Type::Group(group) => extract_tuple(&group.elem),
_ => None,
}
}
fn extract_type_path(ty: &Type) -> Option<TypePath> {
match ty {
Type::Path(path) => Some(path.clone()),
Type::Group(group) => extract_type_path(&group.elem),
_ => None,
}
}