115 lines
4.4 KiB
Rust
115 lines
4.4 KiB
Rust
use darling::ast::Data;
|
|
use proc_macro::TokenStream;
|
|
use proc_macro2::Span;
|
|
use quote::quote;
|
|
use syn::{Error, LitInt};
|
|
|
|
use crate::args::{self, RenameTarget};
|
|
use crate::utils::{get_crate_name, get_rustdoc, GeneratorResult};
|
|
|
|
pub fn generate(object_args: &args::MergedObject) -> GeneratorResult<TokenStream> {
|
|
let crate_name = get_crate_name(object_args.internal);
|
|
let ident = &object_args.ident;
|
|
let extends = object_args.extends;
|
|
let generics = &object_args.generics;
|
|
let where_clause = &generics.where_clause;
|
|
let gql_typename = object_args
|
|
.name
|
|
.clone()
|
|
.unwrap_or_else(|| RenameTarget::Type.rename(ident.to_string()));
|
|
|
|
let desc = get_rustdoc(&object_args.attrs)?
|
|
.map(|s| quote! { ::std::option::Option::Some(#s) })
|
|
.unwrap_or_else(|| quote! {::std::option::Option::None});
|
|
|
|
let s = match &object_args.data {
|
|
Data::Struct(e) => e,
|
|
_ => {
|
|
return Err(
|
|
Error::new_spanned(ident, "MergedObject can only be applied to an struct.").into(),
|
|
)
|
|
}
|
|
};
|
|
|
|
let mut types = Vec::new();
|
|
for field in &s.fields {
|
|
types.push(&field.ty);
|
|
}
|
|
|
|
let create_merged_obj = {
|
|
let mut obj = quote! { #crate_name::MergedObjectTail };
|
|
for i in 0..types.len() {
|
|
let n = LitInt::new(&format!("{}", i), Span::call_site());
|
|
obj = quote! { #crate_name::MergedObject(&self.#n, #obj) };
|
|
}
|
|
quote! {
|
|
#obj
|
|
}
|
|
};
|
|
|
|
let merged_type = {
|
|
let mut obj = quote! { #crate_name::MergedObjectTail };
|
|
for ty in &types {
|
|
obj = quote! { #crate_name::MergedObject::<#ty, #obj> };
|
|
}
|
|
obj
|
|
};
|
|
|
|
let expanded = quote! {
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
impl #generics #crate_name::Type for #ident #generics #where_clause {
|
|
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
|
|
::std::borrow::Cow::Borrowed(#gql_typename)
|
|
}
|
|
|
|
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
|
|
registry.create_type::<Self, _>(|registry| {
|
|
let mut fields = ::std::default::Default::default();
|
|
let mut cache_control = ::std::default::Default::default();
|
|
|
|
if let #crate_name::registry::MetaType::Object {
|
|
fields: obj_fields,
|
|
cache_control: obj_cache_control,
|
|
..
|
|
} = registry.create_dummy_type::<#merged_type>() {
|
|
fields = obj_fields;
|
|
cache_control = obj_cache_control;
|
|
}
|
|
|
|
#crate_name::registry::MetaType::Object {
|
|
name: ::std::borrow::ToOwned::to_owned(#gql_typename),
|
|
description: #desc,
|
|
fields,
|
|
cache_control,
|
|
extends: #extends,
|
|
keys: ::std::option::Option::None,
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
#[#crate_name::async_trait::async_trait]
|
|
impl #generics #crate_name::resolver_utils::ContainerType for #ident #generics #where_clause {
|
|
async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
|
|
#create_merged_obj.resolve_field(ctx).await
|
|
}
|
|
|
|
async fn find_entity(&self, ctx: &#crate_name::Context<'_>, params: &#crate_name::Value) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
|
|
#create_merged_obj.find_entity(ctx, params).await
|
|
}
|
|
}
|
|
|
|
#[allow(clippy::all, clippy::pedantic)]
|
|
#[#crate_name::async_trait::async_trait]
|
|
impl #generics #crate_name::OutputType for #ident #generics #where_clause {
|
|
async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::ServerResult<#crate_name::Value> {
|
|
#crate_name::resolver_utils::resolve_container(ctx, self).await
|
|
}
|
|
}
|
|
|
|
impl #generics #crate_name::ObjectType for #ident #generics #where_clause {}
|
|
};
|
|
Ok(expanded.into())
|
|
}
|