92 lines
3.4 KiB
Rust
92 lines
3.4 KiB
Rust
use darling::ast::Data;
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use proc_macro::TokenStream;
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use proc_macro2::Span;
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use quote::quote;
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use syn::{Error, LitInt};
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use crate::args::{self, RenameTarget};
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use crate::utils::{get_crate_name, get_rustdoc, visible_fn, GeneratorResult};
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pub fn generate(object_args: &args::MergedSubscription) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let ident = &object_args.ident;
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let extends = object_args.extends;
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let gql_typename = object_args
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.name
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.clone()
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.unwrap_or_else(|| RenameTarget::Type.rename(ident.to_string()));
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let desc = get_rustdoc(&object_args.attrs)?
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.map(|s| quote! { ::std::option::Option::Some(#s) })
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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let s = match &object_args.data {
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Data::Struct(e) => e,
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_ => {
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return Err(Error::new_spanned(
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&ident,
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"MergedSubscription can only be applied to an struct.",
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)
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.into())
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}
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};
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let types: Vec<_> = s.fields.iter().map(|field| &field.ty).collect();
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let create_field_stream: proc_macro2::TokenStream = (0..types.len())
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.map(|i| {
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let n = LitInt::new(&i.to_string(), Span::call_site());
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quote!(.or_else(|| #crate_name::SubscriptionType::create_field_stream(&self.#n, ctx)))
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})
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.collect();
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let merged_type = types.iter().fold(
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quote!(#crate_name::MergedObjectTail),
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|obj, ty| quote!(#crate_name::MergedObject::<#ty, #obj>),
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);
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let visible = visible_fn(&object_args.visible);
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let expanded = quote! {
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#[allow(clippy::all, clippy::pedantic)]
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impl #crate_name::Type for #ident {
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fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
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::std::borrow::Cow::Borrowed(#gql_typename)
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}
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fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
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registry.create_type::<Self, _>(|registry| {
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let mut fields = ::std::default::Default::default();
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if let #crate_name::registry::MetaType::Object {
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fields: obj_fields,
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..
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} = registry.create_dummy_type::<#merged_type>() {
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fields = obj_fields;
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}
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#crate_name::registry::MetaType::Object {
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name: ::std::borrow::ToOwned::to_owned(#gql_typename),
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description: #desc,
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fields,
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cache_control: ::std::default::Default::default(),
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extends: #extends,
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keys: ::std::option::Option::None,
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visible: #visible,
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}
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})
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}
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}
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#[allow(clippy::all, clippy::pedantic)]
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impl #crate_name::SubscriptionType for #ident {
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fn create_field_stream<'__life>(
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&'__life self,
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ctx: &'__life #crate_name::Context<'__life>
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) -> ::std::option::Option<::std::pin::Pin<::std::boxed::Box<dyn #crate_name::futures_util::stream::Stream<Item = #crate_name::Response> + ::std::marker::Send + '__life>>> {
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::std::option::Option::None #create_field_stream
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}
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}
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};
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Ok(expanded.into())
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}
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