use darling::ast::Data;
use proc_macro::TokenStream;
use quote::quote;
use syn::ext::IdentExt;
use syn::Error;
use crate::args::{self, RenameRuleExt, RenameTarget};
use crate::utils::{generate_default, get_crate_name, get_rustdoc, visible_fn, GeneratorResult};
pub fn generate(object_args: &args::InputObject) -> 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 s = match &object_args.data {
Data::Struct(s) => s,
_ => {
return Err(
Error::new_spanned(ident, "InputObject can only be applied to an struct.").into(),
)
}
};
let mut struct_fields = Vec::new();
for field in &s.fields {
let vis = &field.vis;
let ty = &field.ty;
let ident = match &field.ident {
Some(ident) => ident,
None => return Err(Error::new_spanned(&ident, "All fields must be named.").into()),
};
let attrs = field
.attrs
.iter()
.filter(|attr| !attr.path.is_ident("field"))
.collect::<Vec<_>>();
struct_fields.push(quote! {
#(#attrs)*
#vis #ident: #ty
});
}
let gql_typename = object_args
.name
.clone()
.or_else(|| object_args.input_name.clone())
.unwrap_or_else(|| RenameTarget::Type.rename(ident.to_string()));
let desc = get_rustdoc(&object_args.attrs)?
.map(|s| quote! { ::std::option::Option::Some(#s) })
.unwrap_or_else(|| quote! {::std::option::Option::None});
let mut get_fields = Vec::new();
let mut put_fields = Vec::new();
let mut fields = Vec::new();
let mut schema_fields = Vec::new();
let mut flatten_fields = Vec::new();
let mut federation_fields = Vec::new();
for field in &s.fields {
let ident = field.ident.as_ref().unwrap();
let ty = &field.ty;
let name = field.name.clone().unwrap_or_else(|| {
object_args
.rename_fields
.rename(ident.unraw().to_string(), RenameTarget::Field)
});
if field.skip {
get_fields.push(quote! {
let #ident: #ty = ::std::default::Default::default();
});
fields.push(ident);
continue;
}
federation_fields.push((ty, name.clone()));
let validators = field
.validator
.clone()
.unwrap_or_default()
.create_validators(
&crate_name,
quote!(&#ident),
quote!(#ty),
Some(quote!(.map_err(#crate_name::InputValueError::propagate))),
)?;
if field.flatten {
flatten_fields.push((ident, ty));
schema_fields.push(quote! {
#crate_name::static_assertions::assert_impl_one!(#ty: #crate_name::InputObjectType);
#ty::create_type_info(registry);
if let #crate_name::registry::MetaType::InputObject { input_fields, .. } =
registry.create_fake_input_type::<#ty>() {
fields.extend(input_fields);
}
});
get_fields.push(quote! {
let #ident: #ty = #crate_name::InputType::parse(
::std::option::Option::Some(#crate_name::Value::Object(::std::clone::Clone::clone(&obj)))
).map_err(#crate_name::InputValueError::propagate)?;
#validators
});
fields.push(ident);
put_fields.push(quote! {
if let #crate_name::Value::Object(values) = #crate_name::InputType::to_value(&self.#ident) {
map.extend(values);
}
});
continue;
}
let desc = get_rustdoc(&field.attrs)?
.map(|s| quote! { ::std::option::Option::Some(#s) })
.unwrap_or_else(|| quote! {::std::option::Option::None});
let default = generate_default(&field.default, &field.default_with)?;
let schema_default = default
.as_ref()
.map(|value| {
quote! {
::std::option::Option::Some(::std::string::ToString::to_string(
&<#ty as #crate_name::InputType>::to_value(&#value)
))
}
})
.unwrap_or_else(|| quote!(::std::option::Option::None));
let secret = field.secret;
if let Some(default) = default {
get_fields.push(quote! {
#[allow(non_snake_case)]
let #ident: #ty = {
match obj.get(#name) {
::std::option::Option::Some(value) => {
#crate_name::InputType::parse(::std::option::Option::Some(::std::clone::Clone::clone(&value)))
.map_err(#crate_name::InputValueError::propagate)?
},
::std::option::Option::None => #default,
}
};
#validators
});
} else {
get_fields.push(quote! {
#[allow(non_snake_case)]
let #ident: #ty = #crate_name::InputType::parse(obj.get(#name).cloned())
.map_err(#crate_name::InputValueError::propagate)?;
#validators
});
}
put_fields.push(quote! {
map.insert(
#crate_name::Name::new(#name),
#crate_name::InputType::to_value(&self.#ident)
);
});
fields.push(ident);
let visible = visible_fn(&field.visible);
schema_fields.push(quote! {
fields.insert(::std::borrow::ToOwned::to_owned(#name), #crate_name::registry::MetaInputValue {
name: #name,
description: #desc,
ty: <#ty as #crate_name::InputType>::create_type_info(registry),
default_value: #schema_default,
visible: #visible,
is_secret: #secret,
});
})
}
if get_fields.is_empty() {
return Err(Error::new_spanned(
&ident,
"A GraphQL Input Object type must define one or more input fields.",
)
.into());
}
let visible = visible_fn(&object_args.visible);
let get_federation_fields = {
let fields = federation_fields.into_iter().map(|(ty, name)| {
quote! {
if let ::std::option::Option::Some(fields) = <#ty as #crate_name::InputType>::federation_fields() {
res.push(::std::format!("{} {}", #name, fields));
} else {
res.push(::std::string::ToString::to_string(#name));
}
}
});
quote! {
let mut res = ::std::vec::Vec::new();
#(#fields)*
::std::option::Option::Some(::std::format!("{{ {} }}", res.join(" ")))
}
};
let expanded = if object_args.concretes.is_empty() {
quote! {
#[allow(clippy::all, clippy::pedantic)]
impl #crate_name::InputType for #ident {
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 {
registry.create_input_type::<Self, _>(|registry| #crate_name::registry::MetaType::InputObject {
name: ::std::borrow::ToOwned::to_owned(#gql_typename),
description: #desc,
input_fields: {
let mut fields = #crate_name::indexmap::IndexMap::new();
#(#schema_fields)*
fields
},
visible: #visible,
rust_typename: ::std::any::type_name::<Self>(),
})
}
fn parse(value: ::std::option::Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
if let ::std::option::Option::Some(#crate_name::Value::Object(obj)) = value {
#(#get_fields)*
::std::result::Result::Ok(Self { #(#fields),* })
} 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();
#(#put_fields)*
#crate_name::Value::Object(map)
}
fn federation_fields() -> ::std::option::Option<::std::string::String> {
#get_federation_fields
}
fn as_raw_value(&self) -> ::std::option::Option<&Self::RawValueType> {
::std::option::Option::Some(self)
}
}
impl #crate_name::InputObjectType 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, _>(|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,
rust_typename: ::std::any::type_name::<Self>(),
})
}
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(obj)) = value {
#(#get_fields)*
::std::result::Result::Ok(Self { #(#fields),* })
} 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();
#(#put_fields)*
#crate_name::Value::Object(map)
}
fn __internal_federation_fields() -> ::std::option::Option<::std::string::String> {
#get_federation_fields
}
}
});
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> {
Self::__internal_federation_fields()
}
fn as_raw_value(&self) -> ::std::option::Option<&Self::RawValueType> {
::std::option::Option::Some(self)
}
}
impl #crate_name::InputObjectType for #concrete_type {}
};
code.push(expanded);
}
quote!(#(#code)*)
};
Ok(expanded.into())
}