2020-03-27 02:20:20 +00:00
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use crate::args;
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use crate::utils::{check_reserved_name, get_crate_name};
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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::{Data, DeriveInput, Error, Fields, Result};
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pub fn generate(object_args: &args::Object, input: &mut 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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2020-04-09 14:03:09 +00:00
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let extends = object_args.extends;
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2020-03-27 02:20:20 +00:00
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let s = match &mut 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 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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check_reserved_name(&gql_typename, object_args.internal)?;
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let desc = object_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 resolvers = Vec::new();
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let mut schema_fields = Vec::new();
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let fields = match &mut s.fields {
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Fields::Named(fields) => fields,
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_ => return Err(Error::new_spanned(input, "All fields must be named.")),
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};
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for item in &mut fields.named {
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if let Some(field) = args::Field::parse(&item.attrs)? {
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let field_name = field
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.name
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.clone()
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.unwrap_or_else(|| item.ident.as_ref().unwrap().to_string().to_camel_case());
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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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2020-04-09 14:03:09 +00:00
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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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2020-03-27 02:20:20 +00:00
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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::Field {
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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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2020-04-09 14:03:09 +00:00
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external: #external,
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provides: #provides,
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requires: #requires,
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2020-03-27 02:20:20 +00:00
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});
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});
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let ident = &item.ident;
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resolvers.push(quote! {
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if field.name.as_str() == #field_name {
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let ctx_obj = ctx.with_selection_set(&field.selection_set);
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2020-04-02 02:21:04 +00:00
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return #crate_name::OutputValueType::resolve(&self.#ident, &ctx_obj, field.position).await;
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2020-03-27 02:20:20 +00:00
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}
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});
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item.attrs.remove(
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item.attrs
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.iter()
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.enumerate()
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.find(|(_, a)| a.path.is_ident("field"))
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.map(|(idx, _)| idx)
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.unwrap(),
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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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#input
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impl #generics #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| #crate_name::registry::Type::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 = std::collections::HashMap::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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2020-04-09 14:03:09 +00:00
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extends: #extends,
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keys: None,
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2020-03-27 02:20:20 +00:00
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})
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}
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}
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::ObjectType for #ident #generics {
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>, field: &#crate_name::graphql_parser::query::Field) -> #crate_name::Result<#crate_name::serde_json::Value> {
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#(#resolvers)*
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2020-04-02 02:21:04 +00:00
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Err(#crate_name::QueryError::FieldNotFound {
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2020-03-27 02:20:20 +00:00
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field_name: field.name.clone(),
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object: #gql_typename.to_string(),
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2020-04-02 02:21:04 +00:00
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}.into_error(field.position))
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2020-03-27 02:20:20 +00:00
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}
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}
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::OutputValueType for #ident #generics {
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2020-04-02 02:21:04 +00:00
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async fn resolve(value: &Self, ctx: &#crate_name::ContextSelectionSet<'_>, _pos: #crate_name::Pos) -> #crate_name::Result<#crate_name::serde_json::Value> {
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2020-03-27 02:20:20 +00:00
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#crate_name::do_resolve(ctx, value).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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