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