129 lines
4.6 KiB
Rust
129 lines
4.6 KiB
Rust
use crate::args;
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use crate::utils::{get_crate_name, get_rustdoc};
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use inflector::Inflector;
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use proc_macro::TokenStream;
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use quote::quote;
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use syn::ext::IdentExt;
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use syn::{Data, DeriveInput, Error, Result};
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pub fn generate(enum_args: &args::Enum, input: &DeriveInput) -> Result<TokenStream> {
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let crate_name = get_crate_name(enum_args.internal);
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let ident = &input.ident;
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let e = match &input.data {
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Data::Enum(e) => e,
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_ => return Err(Error::new_spanned(input, "It should be a enum")),
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};
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let gql_typename = enum_args.name.clone().unwrap_or_else(|| ident.to_string());
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let desc = enum_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 mut enum_items = Vec::new();
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let mut items = Vec::new();
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let mut schema_enum_items = Vec::new();
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for variant in &e.variants {
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if !variant.fields.is_empty() {
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return Err(Error::new_spanned(
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&variant,
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format!(
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"Invalid enum variant {}.\nGraphQL enums may only contain unit variants.",
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variant.ident
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),
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));
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}
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let item_ident = &variant.ident;
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let item_attrs = variant
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.attrs
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.iter()
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.filter(|attr| !attr.path.is_ident("item"))
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.collect::<Vec<_>>();
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let mut item_args = args::EnumItem::parse(&variant.attrs)?;
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let gql_item_name = item_args
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.name
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.take()
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.unwrap_or_else(|| variant.ident.unraw().to_string().to_screaming_snake_case());
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let item_deprecation = item_args
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.deprecation
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.as_ref()
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.map(|s| quote! { Some(#s) })
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.unwrap_or_else(|| quote! {None});
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let item_desc = item_args
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.desc
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.as_ref()
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.map(|s| quote! { Some(#s) })
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.unwrap_or_else(|| quote! {None});
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enum_items.push(quote! { #(#item_attrs)* #item_ident});
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items.push(quote! {
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#crate_name::resolver_utils::EnumItem {
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name: #gql_item_name,
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value: #ident::#item_ident,
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}
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});
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schema_enum_items.push(quote! {
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enum_items.insert(#gql_item_name, #crate_name::registry::MetaEnumValue {
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name: #gql_item_name,
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description: #item_desc,
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deprecation: #item_deprecation,
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});
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});
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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::resolver_utils::EnumType for #ident {
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fn items() -> &'static [#crate_name::resolver_utils::EnumItem<#ident>] {
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&[#(#items),*]
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}
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}
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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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#crate_name::registry::MetaType::Enum {
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name: #gql_typename.to_string(),
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description: #desc,
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enum_values: {
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let mut enum_items = #crate_name::indexmap::IndexMap::new();
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#(#schema_enum_items)*
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enum_items
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},
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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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impl #crate_name::InputValueType for #ident {
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fn parse(value: Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
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#crate_name::resolver_utils::parse_enum(value.unwrap_or_default())
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}
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fn to_value(&self) -> #crate_name::Value {
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#crate_name::resolver_utils::enum_value(*self)
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}
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}
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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, _: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::Result<#crate_name::serde_json::Value> {
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Ok(#crate_name::resolver_utils::enum_value(*self).into_json().unwrap())
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}
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}
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impl #crate_name::type_mark::TypeMarkEnum for #ident {}
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};
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Ok(expanded.into())
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}
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