115 lines
3.7 KiB
Rust
115 lines
3.7 KiB
Rust
use crate::args;
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use crate::utils::get_crate_name;
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use proc_macro::TokenStream;
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use quote::quote;
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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 attrs = &input.attrs;
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let vis = &input.vis;
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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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.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 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 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.to_string());
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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(&variant.ident);
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items.push(quote! {
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#crate_name::GQLEnumItem {
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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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#crate_name::registry::EnumValue {
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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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#(#attrs)*
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#[derive(Copy, Clone, Eq, PartialEq, Debug)]
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#vis enum #ident {
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#(#enum_items),*
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}
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impl #crate_name::GQLEnum for #ident {
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fn items() -> &'static [#crate_name::GQLEnumItem<#ident>] {
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&[#(#items),*]
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}
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}
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impl #crate_name::GQLType 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::type_name(), |registry| {
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#crate_name::registry::Type::Enum {
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name: #gql_typename,
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description: #desc,
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enum_values: vec![#(#schema_enum_items),*],
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}
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})
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}
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}
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impl #crate_name::GQLInputValue for #ident {
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fn parse(value: &#crate_name::Value) -> Option<Self> {
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#crate_name::GQLEnum::parse_enum(value)
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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::GQLOutputValue for #ident {
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async fn resolve(&self, _: &#crate_name::ContextSelectionSet<'_>) -> #crate_name::Result<serde_json::Value> {
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#crate_name::GQLEnum::resolve_enum(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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