73 lines
2.8 KiB
Rust
73 lines
2.8 KiB
Rust
use proc_macro::TokenStream;
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use quote::quote;
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use syn::ItemImpl;
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use crate::args::{self, RenameTarget};
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use crate::utils::{get_crate_name, get_rustdoc, get_type_path_and_name, GeneratorResult};
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pub fn generate(
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scalar_args: &args::Scalar,
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item_impl: &mut ItemImpl,
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) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(scalar_args.internal);
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let self_name = get_type_path_and_name(item_impl.self_ty.as_ref())?.1;
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let gql_typename = scalar_args
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.name
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.clone()
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.unwrap_or_else(|| RenameTarget::Type.rename(self_name.clone()));
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let desc = if scalar_args.use_type_description {
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quote! { ::std::option::Option::Some(<Self as #crate_name::Description>::description()) }
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} else {
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get_rustdoc(&item_impl.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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};
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let self_ty = &item_impl.self_ty;
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let generic = &item_impl.generics;
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let where_clause = &item_impl.generics.where_clause;
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let expanded = quote! {
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#item_impl
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#[allow(clippy::all, clippy::pedantic)]
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impl #generic #crate_name::Type for #self_ty #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_type::<#self_ty, _>(|_| #crate_name::registry::MetaType::Scalar {
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name: ::std::borrow::ToOwned::to_owned(#gql_typename),
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description: #desc,
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is_valid: |value| <#self_ty as #crate_name::ScalarType>::is_valid(value),
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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 #generic #crate_name::InputType for #self_ty #where_clause {
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fn parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
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<#self_ty as #crate_name::ScalarType>::parse(value.unwrap_or_default())
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}
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fn to_value(&self) -> #crate_name::Value {
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<#self_ty as #crate_name::ScalarType>::to_value(self)
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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 #generic #crate_name::OutputType for #self_ty #where_clause {
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async fn resolve(
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&self,
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_: &#crate_name::ContextSelectionSet<'_>,
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_field: &#crate_name::Positioned<#crate_name::parser::types::Field>
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) -> #crate_name::ServerResult<#crate_name::Value> {
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::std::result::Result::Ok(#crate_name::ScalarType::to_value(self))
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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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