121 lines
4.7 KiB
Rust
121 lines
4.7 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::MergedObject) -> 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 (impl_generics, ty_generics, where_clause) = object_args.generics.split_for_impl();
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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(
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Error::new_spanned(ident, "MergedObject can only be applied to an struct.").into(),
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)
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}
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};
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let mut types = Vec::new();
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for field in &s.fields {
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types.push(&field.ty);
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}
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let create_merged_obj = {
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let mut obj = quote! { #crate_name::MergedObjectTail };
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for i in 0..types.len() {
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let n = LitInt::new(&format!("{}", i), Span::call_site());
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obj = quote! { #crate_name::MergedObject(&self.#n, #obj) };
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}
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quote! {
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#obj
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}
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};
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let merged_type = {
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let mut obj = quote! { #crate_name::MergedObjectTail };
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for ty in &types {
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obj = quote! { #crate_name::MergedObject::<#ty, #obj> };
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}
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obj
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};
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let visible = visible_fn(&object_args.visible);
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let resolve_container = if object_args.serial {
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quote! { #crate_name::resolver_utils::resolve_container_serial(ctx, self).await }
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} else {
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quote! { #crate_name::resolver_utils::resolve_container(ctx, self).await }
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};
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let expanded = quote! {
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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #impl_generics #crate_name::resolver_utils::ContainerType for #ident #ty_generics #where_clause {
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
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#create_merged_obj.resolve_field(ctx).await
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}
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async fn find_entity(&self, ctx: &#crate_name::Context<'_>, params: &#crate_name::Value) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
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#create_merged_obj.find_entity(ctx, params).await
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}
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}
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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #impl_generics #crate_name::OutputType for #ident #ty_generics #where_clause {
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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_output_type::<Self, _>(|registry| {
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let mut fields = ::std::default::Default::default();
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let mut cache_control = ::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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cache_control: obj_cache_control,
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..
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} = registry.create_fake_output_type::<#merged_type>() {
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fields = obj_fields;
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cache_control = obj_cache_control;
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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,
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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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is_subscription: false,
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rust_typename: ::std::any::type_name::<Self>(),
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}
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})
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}
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async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::ServerResult<#crate_name::Value> {
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#resolve_container
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}
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}
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impl #impl_generics #crate_name::ObjectType for #ident #ty_generics #where_clause {}
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};
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Ok(expanded.into())
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}
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