198 lines
7.8 KiB
Rust
198 lines
7.8 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, Fields, 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 generics = &input.generics;
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let where_clause = &generics.where_clause;
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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 getters = Vec::new();
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let mut resolvers = Vec::new();
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let mut schema_fields = Vec::new();
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let fields = match &s.fields {
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Fields::Named(fields) => Some(fields),
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Fields::Unit => None,
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_ => return Err(Error::new_spanned(input, "All fields must be named.")),
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};
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if let Some(fields) = fields {
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for item in &fields.named {
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if let Some(field) = args::Field::parse(&crate_name, &item.attrs)? {
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let field_name = field.name.clone().unwrap_or_else(|| {
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item.ident
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.as_ref()
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.unwrap()
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.unraw()
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.to_string()
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.to_camel_case()
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});
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let field_desc = field
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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 field_deprecation = field
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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 external = field.external;
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let requires = match &field.requires {
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Some(requires) => quote! { Some(#requires) },
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None => quote! { None },
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};
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let provides = match &field.provides {
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Some(provides) => quote! { Some(#provides) },
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None => quote! { None },
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};
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let vis = &item.vis;
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let ty = &item.ty;
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let cache_control = {
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let public = field.cache_control.public;
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let max_age = field.cache_control.max_age;
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quote! {
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#crate_name::CacheControl {
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public: #public,
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max_age: #max_age,
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}
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}
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};
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schema_fields.push(quote! {
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fields.insert(#field_name.to_string(), #crate_name::registry::MetaField {
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name: #field_name.to_string(),
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description: #field_desc,
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args: Default::default(),
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ty: <#ty as #crate_name::Type>::create_type_info(registry),
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deprecation: #field_deprecation,
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cache_control: #cache_control,
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external: #external,
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provides: #provides,
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requires: #requires,
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});
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});
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let ident = &item.ident;
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let guard = field
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.guard
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.map(|guard| quote! { #guard.check(ctx).await.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?; });
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let post_guard = field
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.post_guard
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.map(|guard| quote! { #guard.check(ctx, &res).await.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?; });
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getters.push(if !field.owned {
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quote! {
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#[inline]
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#[allow(missing_docs)]
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#vis async fn #ident(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::FieldResult<&#ty> {
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Ok(&self.#ident)
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}
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}
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} else {
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quote! {
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#[inline]
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#[allow(missing_docs)]
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#vis async fn #ident(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::FieldResult<#ty> {
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Ok(self.#ident.clone())
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}
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}
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});
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resolvers.push(quote! {
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if ctx.item.node.name.node == #field_name {
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#guard
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let res = self.#ident(ctx).await.map_err(|err| err.into_error_with_path(ctx.item.pos, ctx.path_node.as_ref()))?;
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let ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
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#post_guard
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return #crate_name::OutputValueType::resolve(&res, &ctx_obj, ctx.item).await;
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}
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});
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}
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}
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}
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let cache_control = {
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let public = object_args.cache_control.public;
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let max_age = object_args.cache_control.max_age;
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quote! {
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#crate_name::CacheControl {
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public: #public,
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max_age: #max_age,
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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 #generics #ident #where_clause {
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#(#getters)*
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}
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#[allow(clippy::all, clippy::pedantic)]
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impl #generics #crate_name::Type for #ident #generics #where_clause {
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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| #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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let mut fields = #crate_name::indexmap::IndexMap::new();
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#(#schema_fields)*
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fields
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},
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cache_control: #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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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::resolver_utils::ObjectType for #ident #generics #where_clause {
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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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#(#resolvers)*
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Err(#crate_name::QueryError::FieldNotFound {
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field_name: ctx.item.node.name.to_string(),
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object: #gql_typename.to_string(),
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}.into_error(ctx.item.pos))
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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 #generics #crate_name::OutputValueType for #ident #generics #where_clause {
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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::resolver_utils::resolve_object(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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