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newtype.rs
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newtype.rs
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#![allow(clippy::option_if_let_else)]
use darling::ast::{Data, Style};
use proc_macro::TokenStream;
use quote::quote;
use syn::Error;
use crate::args::{self, NewTypeName, RenameTarget};
use crate::utils::{get_crate_name, get_rustdoc, visible_fn, GeneratorResult};
pub fn generate(newtype_args: &args::NewType) -> GeneratorResult<TokenStream> {
let crate_name = get_crate_name(newtype_args.internal);
let ident = &newtype_args.ident;
let (impl_generics, ty_generics, where_clause) = newtype_args.generics.split_for_impl();
let gql_typename = match &newtype_args.name {
NewTypeName::New(name) => Some(name.clone()),
NewTypeName::Rust => Some(RenameTarget::Type.rename(ident.to_string())),
NewTypeName::Original => None,
};
let desc = get_rustdoc(&newtype_args.attrs)
.map(|s| quote! { ::std::option::Option::Some(#s) })
.unwrap_or_else(|| quote! {::std::option::Option::None});
let visible = visible_fn(&newtype_args.visible);
let fields = match &newtype_args.data {
Data::Struct(e) => e,
_ => {
return Err(
Error::new_spanned(ident, "NewType can only be applied to an struct.").into(),
)
}
};
if fields.style == Style::Tuple && fields.fields.len() != 1 {
return Err(Error::new_spanned(ident, "Invalid type.").into());
}
let inner_ty = &fields.fields[0];
let type_name = match &gql_typename {
Some(name) => quote! { ::std::borrow::Cow::Borrowed(#name) },
None => quote! { <#inner_ty as #crate_name::LegacyInputType>::type_name() },
};
let create_type_info = if let Some(name) = &gql_typename {
let specified_by_url = match &newtype_args.specified_by_url {
Some(specified_by_url) => quote! { ::std::option::Option::Some(#specified_by_url) },
None => quote! { ::std::option::Option::None },
};
quote! {
registry.create_input_type::<#ident, _>(|_|
#crate_name::registry::MetaType::Scalar(#crate_name::registry::ScalarType {
name: ::std::borrow::ToOwned::to_owned(#name),
description: #desc,
is_valid: |value| <#ident as #crate_name::LegacyScalarType>::is_valid(value),
visible: #visible,
specified_by_url: #specified_by_url,
})
)
}
} else {
quote! { <#inner_ty as #crate_name::LegacyInputType>::create_type_info(registry) }
};
let expanded = quote! {
#[allow(clippy::all, clippy::pedantic)]
impl #impl_generics #crate_name::LegacyScalarType for #ident #ty_generics #where_clause {
fn parse(value: #crate_name::Value) -> #crate_name::InputValueResult<Self> {
<#inner_ty as #crate_name::LegacyScalarType>::parse(value).map(#ident).map_err(#crate_name::InputValueError::propagate)
}
fn to_value(&self) -> #crate_name::Value {
<#inner_ty as #crate_name::LegacyScalarType>::to_value(&self.0)
}
}
impl #impl_generics ::std::convert::From<#inner_ty> for #ident #ty_generics #where_clause {
fn from(value: #inner_ty) -> Self {
Self(value)
}
}
impl #impl_generics ::std::convert::Into<#inner_ty> for #ident #ty_generics #where_clause {
fn into(self) -> #inner_ty {
self.0
}
}
#[allow(clippy::all, clippy::pedantic)]
impl #impl_generics #crate_name::LegacyInputType for #ident #ty_generics #where_clause {
type RawValueType = #inner_ty;
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
#type_name
}
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> #crate_name::registry::InputValueType {
#create_type_info
}
fn parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
<#ident as #crate_name::LegacyScalarType>::parse(value.unwrap_or_default())
}
fn to_value(&self) -> #crate_name::Value {
<#ident as #crate_name::LegacyScalarType>::to_value(self)
}
fn as_raw_value(&self) -> ::std::option::Option<&Self::RawValueType> {
self.0.as_raw_value()
}
}
#[allow(clippy::all, clippy::pedantic)]
#[#crate_name::async_trait::async_trait]
impl #impl_generics #crate_name::LegacyOutputType for #ident #ty_generics #where_clause {
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
#type_name
}
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> #crate_name::registry::MetaFieldType {
#create_type_info
}
async fn resolve(
&self,
_: &#crate_name::ContextSelectionSet<'_>,
_field: &#crate_name::Positioned<#crate_name::parser::types::Field>
) -> #crate_name::ServerResult<#crate_name::ResponseNodeId> {
Ok(#crate_name::LegacyScalarType::to_value(self))
}
}
};
Ok(expanded.into())
}