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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| use proc_macro2::{Span, TokenStream}; | ||
| use quote::quote; | ||
| use syn::{parse_quote, Ident, ReturnType, Signature, Type}; | ||
|
|
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| use crate::agent_fn::{AgentFn, AgentFnType, AgentName}; | ||
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| pub struct OneshotFn {} | ||
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| impl AgentFnType for OneshotFn { | ||
| type OutputType = Type; | ||
| type RecvType = Type; | ||
|
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| fn attr_name() -> &'static str { | ||
| "oneshot" | ||
| } | ||
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| fn agent_type_name() -> &'static str { | ||
| "oneshot" | ||
| } | ||
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| fn parse_recv_type(sig: &Signature) -> syn::Result<Self::RecvType> { | ||
| let mut inputs = sig.inputs.iter(); | ||
| let arg = inputs | ||
| .next() | ||
| .ok_or_else(|| syn::Error::new_spanned(&sig.ident, "expected 1 argument"))?; | ||
|
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| let ty = Self::extract_fn_arg_type(arg)?; | ||
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| Self::assert_no_left_argument(inputs, 1)?; | ||
|
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| Ok(ty) | ||
| } | ||
|
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| fn parse_output_type(sig: &Signature) -> syn::Result<Self::OutputType> { | ||
| let ty = match &sig.output { | ||
| ReturnType::Default => { | ||
| parse_quote! { () } | ||
| } | ||
| ReturnType::Type(_, ty) => *ty.clone(), | ||
| }; | ||
|
|
||
| Ok(ty) | ||
| } | ||
| } | ||
|
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| pub fn oneshot_impl(name: AgentName, mut agent_fn: AgentFn<OneshotFn>) -> syn::Result<TokenStream> { | ||
| agent_fn.merge_agent_name(name)?; | ||
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||
| let struct_attrs = agent_fn.filter_attrs_for_agent_struct(); | ||
| let oneshot_impl_attrs = agent_fn.filter_attrs_for_agent_impl(); | ||
| let phantom_generics = agent_fn.phantom_generics(); | ||
| let oneshot_name = agent_fn.agent_name(); | ||
| let fn_name = agent_fn.inner_fn_ident(); | ||
| let inner_fn = agent_fn.print_inner_fn(); | ||
|
|
||
| let AgentFn { | ||
| recv_type: input_type, | ||
| generics, | ||
| output_type, | ||
| vis, | ||
| is_async, | ||
| .. | ||
| } = agent_fn; | ||
| let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); | ||
| let fn_generics = ty_generics.as_turbofish(); | ||
|
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| let in_ident = Ident::new("_input", Span::mixed_site()); | ||
|
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| let fn_call = if is_async { | ||
| quote! { #fn_name #fn_generics (#in_ident).await } | ||
| } else { | ||
| quote! { #fn_name #fn_generics (#in_ident) } | ||
| }; | ||
| let crate_name = quote! { ::yew_agent }; | ||
|
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| let quoted = quote! { | ||
| #(#struct_attrs)* | ||
| #[allow(unused_parens)] | ||
| #vis struct #oneshot_name #generics #where_clause { | ||
| inner: ::std::pin::Pin<::std::boxed::Box<dyn ::std::future::Future<Output = #output_type>>>, | ||
| _marker: ::std::marker::PhantomData<(#phantom_generics)>, | ||
| } | ||
|
|
||
| // we cannot disable any lints here because it will be applied to the function body | ||
| // as well. | ||
| #(#oneshot_impl_attrs)* | ||
| impl #impl_generics ::#crate_name::oneshot::Oneshot for #oneshot_name #ty_generics #where_clause { | ||
| type Input = #input_type; | ||
|
|
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| fn create(#in_ident: Self::Input) -> Self { | ||
| #inner_fn | ||
|
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| Self { | ||
| inner: ::std::boxed::Box::pin( | ||
| async move { | ||
| #fn_call | ||
| } | ||
| ), | ||
| _marker: ::std::marker::PhantomData, | ||
| } | ||
| } | ||
| } | ||
|
|
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| impl #impl_generics ::std::future::Future for #oneshot_name #ty_generics #where_clause { | ||
| type Output = #output_type; | ||
|
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| fn poll(mut self: ::std::pin::Pin<&mut Self>, cx: &mut ::std::task::Context<'_>) -> ::std::task::Poll<Self::Output> { | ||
| ::std::future::Future::poll(::std::pin::Pin::new(&mut self.inner), cx) | ||
| } | ||
| } | ||
|
|
||
| impl #impl_generics ::#crate_name::Registrable for #oneshot_name #ty_generics #where_clause { | ||
| type Registrar = ::#crate_name::oneshot::OneshotRegistrar<Self>; | ||
|
|
||
| fn registrar() -> Self::Registrar { | ||
| ::#crate_name::oneshot::OneshotRegistrar::<Self>::new() | ||
| } | ||
| } | ||
|
|
||
| impl #impl_generics ::#crate_name::Spawnable for #oneshot_name #ty_generics #where_clause { | ||
| type Spawner = ::#crate_name::oneshot::OneshotSpawner<Self>; | ||
|
|
||
| fn spawner() -> Self::Spawner { | ||
| ::#crate_name::oneshot::OneshotSpawner::<Self>::new() | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| Ok(quoted) | ||
| } |
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