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use crate::*;
pub fn gen_async(
def: &tables::TypeDef,
interfaces: &[InterfaceInfo],
gen: &Gen,
) -> (TokenStream, TokenStream) {
let kind = async_kind(def);
if kind != AsyncKind::None {
return gen_async_kind(kind, def, def, gen);
}
for interface in interfaces {
let kind = async_kind(&interface.def);
if kind != AsyncKind::None {
return gen_async_kind(kind, &interface.def, def, gen);
}
}
(TokenStream::new(), TokenStream::new())
}
#[derive(PartialEq)]
pub enum AsyncKind {
None,
Action,
ActionWithProgress,
Operation,
OperationWithProgress,
}
pub fn async_kind(def: &tables::TypeDef) -> AsyncKind {
if def.namespace() != "Windows.Foundation" {
return AsyncKind::None;
}
match def.name() {
"IAsyncAction" => AsyncKind::Action,
"IAsyncActionWithProgress`1" => AsyncKind::ActionWithProgress,
"IAsyncOperation`1" => AsyncKind::Operation,
"IAsyncOperationWithProgress`2" => AsyncKind::OperationWithProgress,
_ => AsyncKind::None,
}
}
fn gen_async_kind(
kind: AsyncKind,
name: &tables::TypeDef,
self_name: &tables::TypeDef,
gen: &Gen,
) -> (TokenStream, TokenStream) {
let return_type = match kind {
AsyncKind::Operation | AsyncKind::OperationWithProgress => name.generics[0].gen_name(gen),
_ => quote! { () },
};
let handler = match kind {
AsyncKind::Action => quote! { AsyncActionCompletedHandler },
AsyncKind::ActionWithProgress => quote! { AsyncActionWithProgressCompletedHandler },
AsyncKind::Operation => quote! { AsyncOperationCompletedHandler },
AsyncKind::OperationWithProgress => quote! { AsyncOperationWithProgressCompletedHandler },
_ => panic!("Unexpected AsyncKind"),
};
let constraints = self_name.gen_constraints(gen);
let name = self_name.gen_name(gen);
let namespace = gen.namespace("Windows.Foundation");
(
quote! {
pub fn get(&self) -> ::windows::Result<#return_type> {
if self.Status()? == #namespace AsyncStatus::Started {
let (waiter, signaler) = ::windows::Waiter::new();
self.SetCompleted(#namespace #handler::new(move |_sender, _args| {
unsafe { signaler.signal(); }
Ok(())
}))?;
}
self.GetResults()
}
},
quote! {
impl<#constraints> ::std::future::Future for #name {
type Output = ::windows::Result<#return_type>;
fn poll(self: ::std::pin::Pin<&mut Self>, context: &mut ::std::task::Context) -> ::std::task::Poll<Self::Output> {
if self.Status()? == #namespace AsyncStatus::Started {
let waker = context.waker().clone();
let _ = self.SetCompleted(#namespace #handler::new(move |_sender, _args| {
waker.wake_by_ref();
Ok(())
}));
::std::task::Poll::Pending
} else {
::std::task::Poll::Ready(self.GetResults())
}
}
}
},
)
}