use crate::args::{self, RenameRuleExt, RenameTarget};
use crate::utils::{
generate_default, generate_validator, get_crate_name, get_rustdoc, GeneratorResult,
};
use darling::ast::Data;
use proc_macro::TokenStream;
use quote::quote;
use syn::ext::IdentExt;
use syn::Error;
pub fn generate(object_args: &args::InputObject) -> GeneratorResult<TokenStream> {
let crate_name = get_crate_name(object_args.internal);
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 = &field.ident;
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()
.unwrap_or_else(|| RenameTarget::Type.rename(ident.to_string()));
let desc = get_rustdoc(&object_args.attrs)?
.map(|s| quote! { Some(#s) })
.unwrap_or_else(|| quote! {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();
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.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 Some(#crate_name::registry::MetaType::InputObject{ input_fields, .. }) =
registry.types.get(&*<#ty as #crate_name::Type>::type_name()) {
fields.extend(input_fields.clone());
}
});
get_fields.push(quote! {
let #ident: #ty = #crate_name::InputValueType::parse(
Some(#crate_name::Value::Object(obj.clone()))
).map_err(#crate_name::InputValueError::propagate)?;
});
fields.push(ident);
put_fields.push(quote! {
if let #crate_name::Value::Object(values) = #crate_name::InputValueType::to_value(&self.#ident) {
map.extend(values);
}
});
continue;
}
let validator = match &field.validator {
Some(meta) => {
let stream = generate_validator(&crate_name, meta)?;
quote!(Some(#stream))
}
None => quote!(None),
};
let desc = get_rustdoc(&field.attrs)?
.map(|s| quote! { Some(#s) })
.unwrap_or_else(|| quote! {None});
let default = generate_default(&field.default, &field.default_with)?;
let schema_default = default
.as_ref()
.map(|value| {
quote! {Some( <#ty as #crate_name::InputValueType>::to_value(&#value).to_string() )}
})
.unwrap_or_else(|| quote! {None});
if let Some(default) = default {
get_fields.push(quote! {
#[allow(non_snake_case)]
let #ident: #ty = {
match obj.get(#name) {
Some(value) => #crate_name::InputValueType::parse(Some(value.clone()))
.map_err(#crate_name::InputValueError::propagate)?,
None => #default,
}
};
});
} else {
get_fields.push(quote! {
#[allow(non_snake_case)]
let #ident: #ty = #crate_name::InputValueType::parse(obj.get(#name).cloned())
.map_err(#crate_name::InputValueError::propagate)?;
});
}
put_fields.push(quote! {
map.insert(
#crate_name::Name::new(#name),
#crate_name::InputValueType::to_value(&self.#ident)
);
});
fields.push(ident);
schema_fields.push(quote! {
fields.insert(#name.to_string(), #crate_name::registry::MetaInputValue {
name: #name,
description: #desc,
ty: <#ty as #crate_name::Type>::create_type_info(registry),
default_value: #schema_default,
validator: #validator,
});
})
}
let expanded = quote! {
#[allow(clippy::all, clippy::pedantic)]
impl #crate_name::Type for #ident {
fn type_name() -> ::std::borrow::Cow<'static, str> {
::std::borrow::Cow::Borrowed(#gql_typename)
}
fn create_type_info(registry: &mut #crate_name::registry::Registry) -> String {
registry.create_type::<Self, _>(|registry| #crate_name::registry::MetaType::InputObject {
name: #gql_typename.to_string(),
description: #desc,
input_fields: {
let mut fields = #crate_name::indexmap::IndexMap::new();
#(#schema_fields)*
fields
}
})
}
}
#[allow(clippy::all, clippy::pedantic)]
impl #crate_name::InputValueType for #ident {
fn parse(value: Option<#crate_name::Value>) -> #crate_name::InputValueResult<Self> {
if let Some(#crate_name::Value::Object(obj)) = value {
#(#get_fields)*
Ok(Self { #(#fields),* })
} else {
Err(#crate_name::InputValueError::expected_type(value.unwrap_or_default()))
}
}
fn to_value(&self) -> #crate_name::Value {
let mut map = ::std::collections::BTreeMap::new();
#(#put_fields)*
#crate_name::Value::Object(map)
}
}
impl #crate_name::InputObjectType for #ident {}
};
Ok(expanded.into())
}