372 lines
14 KiB
Rust
372 lines
14 KiB
Rust
use darling::ast::{Data, Style};
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use proc_macro::TokenStream;
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use proc_macro2::{Ident, Span};
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use quote::quote;
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use std::collections::HashSet;
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use syn::visit_mut::VisitMut;
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use syn::{visit_mut, Error, Lifetime, Type};
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use crate::args::{self, InterfaceField, InterfaceFieldArgument, RenameRuleExt, RenameTarget};
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use crate::output_type::OutputType;
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use crate::utils::{generate_default, get_crate_name, get_rustdoc, GeneratorResult};
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pub fn generate(interface_args: &args::Interface) -> GeneratorResult<TokenStream> {
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let crate_name = get_crate_name(interface_args.internal);
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let ident = &interface_args.ident;
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let generics = &interface_args.generics;
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let s = match &interface_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, "Interface 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 extends = interface_args.extends;
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let mut enum_names = Vec::new();
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let mut enum_items = HashSet::new();
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let mut type_into_impls = Vec::new();
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let gql_typename = interface_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 desc = get_rustdoc(&interface_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 mut registry_types = Vec::new();
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let mut possible_types = Vec::new();
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let mut get_introspection_typename = Vec::new();
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let mut collect_all_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 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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struct RemoveLifetime;
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impl VisitMut for RemoveLifetime {
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fn visit_lifetime_mut(&mut self, i: &mut Lifetime) {
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i.ident = Ident::new("_", Span::call_site());
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visit_mut::visit_lifetime_mut(self, i);
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}
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}
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let mut assert_ty = p.clone();
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RemoveLifetime.visit_type_path_mut(&mut assert_ty);
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type_into_impls.push(quote! {
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#crate_name::static_assertions::assert_impl_any!(#assert_ty: #crate_name::ObjectType, #crate_name::InterfaceType);
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#[allow(clippy::all, clippy::pedantic)]
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impl #generics ::std::convert::From<#p> for #ident #generics {
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fn from(obj: #p) -> Self {
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#ident::#enum_name(obj)
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}
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}
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});
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enum_names.push(enum_name);
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registry_types.push(quote! {
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<#p as #crate_name::Type>::create_type_info(registry);
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registry.add_implements(&<#p as #crate_name::Type>::type_name(), #gql_typename);
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});
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possible_types.push(quote! {
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possible_types.insert(<#p as #crate_name::Type>::type_name().into_owned());
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});
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get_introspection_typename.push(quote! {
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#ident::#enum_name(obj) => <#p as #crate_name::Type>::type_name()
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});
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collect_all_fields.push(quote! {
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#ident::#enum_name(obj) => obj.collect_all_fields(ctx, fields)
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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 mut methods = Vec::new();
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let mut schema_fields = Vec::new();
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let mut resolvers = Vec::new();
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if interface_args.fields.is_empty() {
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return Err(Error::new_spanned(
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&ident,
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"A GraphQL Interface type must define one or more fields.",
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)
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.into());
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}
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for InterfaceField {
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name,
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method,
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desc,
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ty,
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args,
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deprecation,
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external,
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provides,
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requires,
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} in &interface_args.fields
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{
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let (name, method_name) = if let Some(method) = method {
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(name.to_string(), Ident::new(method, Span::call_site()))
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} else {
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let method_name = Ident::new(&name, Span::call_site());
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(
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interface_args
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.rename_fields
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.rename(name, RenameTarget::Field),
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method_name,
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)
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};
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let ty = match syn::parse_str::<syn::Type>(&ty.value()) {
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Ok(ty) => ty,
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Err(_) => return Err(Error::new_spanned(&ty, "Expect type").into()),
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};
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let mut calls = Vec::new();
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let mut use_params = Vec::new();
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let mut decl_params = Vec::new();
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let mut get_params = Vec::new();
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let mut schema_args = Vec::new();
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let requires = match &requires {
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Some(requires) => quote! { ::std::option::Option::Some(#requires) },
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None => quote! { ::std::option::Option::None },
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};
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let provides = match &provides {
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Some(provides) => quote! { ::std::option::Option::Some(#provides) },
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None => quote! { ::std::option::Option::None },
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};
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decl_params.push(quote! { ctx: &'ctx #crate_name::Context<'ctx> });
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use_params.push(quote! { ctx });
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for InterfaceFieldArgument {
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name,
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desc,
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ty,
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default,
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default_with,
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} in args
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{
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let ident = Ident::new(name, Span::call_site());
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let name = interface_args
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.rename_args
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.rename(name, RenameTarget::Argument);
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let ty = match syn::parse_str::<syn::Type>(&ty.value()) {
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Ok(ty) => ty,
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Err(_) => return Err(Error::new_spanned(&ty, "Expect type").into()),
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};
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decl_params.push(quote! { #ident: #ty });
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use_params.push(quote! { #ident });
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let default = generate_default(&default, &default_with)?;
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let get_default = match &default {
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Some(default) => quote! { ::std::option::Option::Some(|| -> #ty { #default }) },
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None => quote! { ::std::option::Option::None },
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};
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get_params.push(quote! {
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let #ident: #ty = ctx.param_value(#name, #get_default)?;
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});
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let desc = desc
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.as_ref()
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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 schema_default = default
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.as_ref()
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.map(|value| {
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quote! {
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::std::option::Option::Some(::std::string::ToString::to_string(
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&<#ty as #crate_name::InputType>::to_value(&#value)
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))
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}
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})
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.unwrap_or_else(|| quote! {::std::option::Option::None});
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schema_args.push(quote! {
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args.insert(#name, #crate_name::registry::MetaInputValue {
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name: #name,
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description: #desc,
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ty: <#ty as #crate_name::Type>::create_type_info(registry),
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default_value: #schema_default,
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validator: ::std::option::Option::None,
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});
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});
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}
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for enum_name in &enum_names {
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calls.push(quote! {
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#ident::#enum_name(obj) => obj.#method_name(#(#use_params),*).await.map(::std::convert::Into::into)
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});
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}
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let desc = desc
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.as_ref()
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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 deprecation = deprecation
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.as_ref()
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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 oty = OutputType::parse(&ty)?;
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let ty = match oty {
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OutputType::Value(ty) => ty,
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OutputType::Result(_, ty) => ty,
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};
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let schema_ty = oty.value_type();
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methods.push(quote! {
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#[inline]
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pub async fn #method_name<'ctx>(&self, #(#decl_params),*) -> #crate_name::Result<#ty> {
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match self {
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#(#calls,)*
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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(::std::string::ToString::to_string(#name), #crate_name::registry::MetaField {
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name: ::std::string::ToString::to_string(#name),
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description: #desc,
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args: {
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let mut args = #crate_name::indexmap::IndexMap::new();
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#(#schema_args)*
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args
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},
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ty: <#schema_ty as #crate_name::Type>::create_type_info(registry),
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deprecation: #deprecation,
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cache_control: ::std::default::Default::default(),
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external: #external,
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provides: #provides,
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requires: #requires,
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});
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});
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let resolve_obj = quote! {
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self.#method_name(#(#use_params),*)
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.await
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.map_err(|err| err.into_server_error().at(ctx.item.pos))?
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};
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resolvers.push(quote! {
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if ctx.item.node.name.node == #name {
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#(#get_params)*
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let ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
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return #crate_name::OutputType::resolve(&#resolve_obj, &ctx_obj, ctx.item).await.map(::std::option::Option::Some);
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}
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});
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}
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let introspection_type_name = if get_introspection_typename.is_empty() {
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quote! { ::std::unreachable!() }
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} else {
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quote! {
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match self {
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#(#get_introspection_typename),*
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}
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}
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};
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let expanded = quote! {
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#(#type_into_impls)*
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#[allow(clippy::all, clippy::pedantic)]
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impl #generics #ident #generics {
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#(#methods)*
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}
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#[allow(clippy::all, clippy::pedantic)]
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impl #generics #crate_name::Type for #ident #generics {
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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 introspection_type_name(&self) -> ::std::borrow::Cow<'static, ::std::primitive::str> {
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#introspection_type_name
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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_type::<Self, _>(|registry| {
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#(#registry_types)*
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#crate_name::registry::MetaType::Interface {
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name: ::std::string::ToString::to_string(#gql_typename),
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description: #desc,
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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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possible_types: {
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let mut possible_types = #crate_name::indexmap::IndexSet::new();
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#(#possible_types)*
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possible_types
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},
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extends: #extends,
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keys: ::std::option::Option::None,
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}
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})
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}
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}
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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::resolver_utils::ContainerType for #ident #generics {
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async fn resolve_field(&self, ctx: &#crate_name::Context<'_>) -> #crate_name::ServerResult<::std::option::Option<#crate_name::Value>> {
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#(#resolvers)*
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::std::result::Result::Ok(::std::option::Option::None)
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}
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fn collect_all_fields<'__life>(&'__life self, ctx: &#crate_name::ContextSelectionSet<'__life>, fields: &mut #crate_name::resolver_utils::Fields<'__life>) -> #crate_name::ServerResult<()> {
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match self {
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#(#collect_all_fields),*
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}
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}
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}
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#[allow(clippy::all, clippy::pedantic)]
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::OutputType for #ident #generics {
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async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>, _field: &#crate_name::Positioned<#crate_name::parser::types::Field>) -> #crate_name::ServerResult<#crate_name::Value> {
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#crate_name::resolver_utils::resolve_container(ctx, self).await
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}
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}
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impl #generics #crate_name::InterfaceType for #ident #generics {}
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};
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Ok(expanded.into())
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}
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