use darling::ast::{Data, Style};
use proc_macro::TokenStream;
use quote::quote;
use syn::{Error, Type};
use crate::{
args,
args::{RenameRuleExt, RenameTarget},
utils::{get_crate_name, get_rustdoc, visible_fn, GeneratorResult},
};
pub fn generate(object_args: &args::OneofObject) -> GeneratorResult<TokenStream> {
let crate_name = get_crate_name(object_args.internal);
let (impl_generics, ty_generics, where_clause) = object_args.generics.split_for_impl();
let ident = &object_args.ident;
let desc = get_rustdoc(&object_args.attrs)?
.map(|s| quote! { ::std::option::Option::Some(::std::string::ToString::to_string(#s)) })
.unwrap_or_else(|| quote! {::std::option::Option::None});
let inaccessible = object_args.inaccessible;
let tags = object_args
.tags
.iter()
.map(|tag| quote!(::std::string::ToString::to_string(#tag)))
.collect::<Vec<_>>();
let gql_typename = if !object_args.name_type {
let name = object_args
.input_name
.clone()
.or_else(|| object_args.name.clone())
.unwrap_or_else(|| RenameTarget::Type.rename(ident.to_string()));
quote!(::std::borrow::Cow::Borrowed(#name))
} else {
quote!(<Self as #crate_name::TypeName>::type_name())
};
let s = match &object_args.data {
Data::Enum(s) => s,
_ => {
return Err(
Error::new_spanned(ident, "InputObject can only be applied to an enum.").into(),
)
}
};
let mut enum_names = Vec::new();
let mut schema_fields = Vec::new();
let mut parse_item = Vec::new();
let mut put_fields = Vec::new();
for variant in s {
let enum_name = &variant.ident;
let field_name = variant.name.clone().unwrap_or_else(|| {
object_args
.rename_fields
.rename(enum_name.to_string(), RenameTarget::Field)
});
let inaccessible = variant.inaccessible;
let tags = variant
.tags
.iter()
.map(|tag| quote!(::std::string::ToString::to_string(#tag)))
.collect::<Vec<_>>();
let desc = get_rustdoc(&object_args.attrs)?
.map(|s| quote! { ::std::option::Option::Some(::std::string::ToString::to_string(#s)) })
.unwrap_or_else(|| quote! {::std::option::Option::None});
let ty = match variant.fields.style {
Style::Tuple if variant.fields.fields.len() == 1 => &variant.fields.fields[0],
Style::Tuple => {
return Err(Error::new_spanned(
enum_name,
"Only single value variants are supported",
)
.into())
}
Style::Unit => {
return Err(
Error::new_spanned(enum_name, "Empty variants are not supported").into(),
)
}
Style::Struct => {
return Err(Error::new_spanned(
enum_name,
"Variants with named fields are not supported",
)
.into())
}
};
if let Type::Path(_) = ty {
enum_names.push(enum_name);
let secret = variant.secret;
let visible = visible_fn(&variant.visible);
schema_fields.push(quote! {
fields.insert(::std::borrow::ToOwned::to_owned(#field_name), #crate_name::registry::MetaInputValue {
name: ::std::string::ToString::to_string(#field_name),
description: #desc,
ty: <::std::option::Option<#ty> as #crate_name::InputType>::create_type_info(registry),
default_value: ::std::option::Option::None,
visible: #visible,
inaccessible: #inaccessible,
tags: ::std::vec![ #(#tags),* ],
is_secret: #secret,
});
});
let validators = variant
.validator
.clone()
.unwrap_or_default()
.create_validators(
&crate_name,
quote!(&value),
Some(quote!(.map_err(#crate_name::InputValueError::propagate))),
)?;
parse_item.push(quote! {
if obj.contains_key(#field_name) && obj.len() == 1 {
let value = #crate_name::InputType::parse(obj.remove(#field_name)).map_err(#crate_name::InputValueError::propagate)?;
#validators
return ::std::result::Result::Ok(Self::#enum_name(value));
}
});
put_fields.push(quote! {
Self::#enum_name(value) => {
map.insert(#crate_name::Name::new(#field_name), #crate_name::InputType::to_value(value));
}
});
} else {
return Err(Error::new_spanned(ty, "Invalid type").into());
}
}
let visible = visible_fn(&object_args.visible);
let expanded = if object_args.concretes.is_empty() {
quote! {
impl #crate_name::InputType for #ident {
type RawValueType = Self;
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
#gql_typename
}
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
registry.create_input_type::<Self, _>(#crate_name::registry::MetaTypeId::InputObject, |registry| #crate_name::registry::MetaType::InputObject {
name: ::std::borrow::Cow::into_owned(#gql_typename),
description: #desc,
input_fields: {
let mut fields = #crate_name::indexmap::IndexMap::new();
#(#schema_fields)*
fields
},
visible: #visible,
inaccessible: #inaccessible,
tags: ::std::vec![ #(#tags),* ],
rust_typename: ::std::option::Option::Some(::std::any::type_name::<Self>()),
oneof: true,
})
}
fn parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
if let ::std::option::Option::Some(#crate_name::Value::Object(mut obj)) = value {
#(#parse_item)*
::std::result::Result::Err(#crate_name::InputValueError::expected_type(#crate_name::Value::Object(obj)))
} else {
::std::result::Result::Err(#crate_name::InputValueError::expected_type(value.unwrap_or_default()))
}
}
fn to_value(&self) -> #crate_name::Value {
let mut map = #crate_name::indexmap::IndexMap::new();
match self {
#(#put_fields)*
}
#crate_name::Value::Object(map)
}
fn federation_fields() -> ::std::option::Option<::std::string::String> {
::std::option::Option::None
}
fn as_raw_value(&self) -> ::std::option::Option<&Self::RawValueType> {
::std::option::Option::Some(self)
}
}
impl #crate_name::InputObjectType for #ident {}
impl #crate_name::OneofObjectType for #ident {}
}
} else {
let mut code = Vec::new();
code.push(quote! {
#[allow(clippy::all, clippy::pedantic)]
impl #impl_generics #ident #ty_generics #where_clause {
fn __internal_create_type_info(registry: &mut #crate_name::registry::Registry, name: &str) -> ::std::string::String where Self: #crate_name::InputType {
registry.create_input_type::<Self, _>(#crate_name::registry::MetaTypeId::InputObject, |registry| #crate_name::registry::MetaType::InputObject {
name: ::std::borrow::ToOwned::to_owned(name),
description: #desc,
input_fields: {
let mut fields = #crate_name::indexmap::IndexMap::new();
#(#schema_fields)*
fields
},
visible: #visible,
inaccessible: #inaccessible,
tags: ::std::vec![ #(#tags),* ],
rust_typename: ::std::option::Option::Some(::std::any::type_name::<Self>()),
oneof: true,
})
}
fn __internal_parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> where Self: #crate_name::InputType {
if let ::std::option::Option::Some(#crate_name::Value::Object(mut obj)) = value {
#(#parse_item)*
::std::result::Result::Err(#crate_name::InputValueError::expected_type(#crate_name::Value::Object(obj)))
} else {
::std::result::Result::Err(#crate_name::InputValueError::expected_type(value.unwrap_or_default()))
}
}
fn __internal_to_value(&self) -> #crate_name::Value where Self: #crate_name::InputType {
let mut map = #crate_name::indexmap::IndexMap::new();
match self {
#(#put_fields)*
}
#crate_name::Value::Object(map)
}
}
});
for concrete in &object_args.concretes {
let gql_typename = &concrete.name;
let params = &concrete.params.0;
let concrete_type = quote! { #ident<#(#params),*> };
let expanded = quote! {
#[allow(clippy::all, clippy::pedantic)]
impl #crate_name::InputType for #concrete_type {
type RawValueType = Self;
fn type_name() -> ::std::borrow::Cow<'static, ::std::primitive::str> {
::std::borrow::Cow::Borrowed(#gql_typename)
}
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> ::std::string::String {
Self::__internal_create_type_info(registry, #gql_typename)
}
fn parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
Self::__internal_parse(value)
}
fn to_value(&self) -> #crate_name::Value {
self.__internal_to_value()
}
fn federation_fields() -> ::std::option::Option<::std::string::String> {
::std::option::Option::None
}
fn as_raw_value(&self) -> ::std::option::Option<&Self::RawValueType> {
::std::option::Option::Some(self)
}
}
impl #crate_name::InputObjectType for #concrete_type {}
impl #crate_name::OneofObjectType for #concrete_type {}
};
code.push(expanded);
}
quote!(#(#code)*)
};
Ok(expanded.into())
}