106 lines
3.6 KiB
Rust
106 lines
3.6 KiB
Rust
use crate::args;
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use crate::utils::{get_crate_name, get_rustdoc};
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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::{Data, DeriveInput, Error, LitInt, Result};
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pub fn generate(object_args: &args::Object, input: &DeriveInput) -> Result<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let ident = &input.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(|| ident.to_string());
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let desc = object_args
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.desc
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.clone()
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.or_else(|| get_rustdoc(&input.attrs).ok().flatten())
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.map(|s| quote! { Some(#s) })
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.unwrap_or_else(|| quote! {None});
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let s = match &input.data {
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Data::Struct(e) => e,
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_ => return Err(Error::new_spanned(input, "It should be a struct")),
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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 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, 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) -> String {
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registry.create_type::<Self, _>(|registry| {
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#merged_type::create_type_info(registry);
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let mut fields = Default::default();
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let mut cache_control = Default::default();
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if let Some(#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.types.remove(&*#merged_type::type_name()) {
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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: #gql_typename.to_string(),
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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: None,
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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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#[#crate_name::async_trait::async_trait]
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impl #crate_name::ObjectType for #ident {
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::Result<#crate_name::serde_json::Value> {
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#create_merged_obj.resolve_field(ctx).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 #crate_name::OutputValueType for #ident {
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async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::Result<#crate_name::serde_json::Value> {
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#crate_name::do_resolve(ctx, self).await
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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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