306 lines
13 KiB
Rust
306 lines
13 KiB
Rust
use crate::args;
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use crate::utils::{build_value_repr, get_crate_name};
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use proc_macro::TokenStream;
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use quote::quote;
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use syn::{
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Error, FnArg, GenericArgument, ImplItem, ItemImpl, Pat, PathArguments, Result, ReturnType,
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Type, TypeReference,
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};
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enum OutputType<'a> {
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Value(&'a Type),
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Result(&'a Type, &'a Type),
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}
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pub fn generate(object_args: &args::Object, item_impl: &mut ItemImpl) -> Result<TokenStream> {
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let crate_name = get_crate_name(object_args.internal);
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let (self_ty, self_name) = match item_impl.self_ty.as_ref() {
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Type::Path(path) => (
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path,
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path.path
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.segments
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.last()
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.map(|s| s.ident.to_string())
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.unwrap(),
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),
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_ => return Err(Error::new_spanned(&item_impl.self_ty, "Invalid type")),
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};
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let generics = &item_impl.generics;
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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(|| self_name.clone());
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let desc = object_args
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let mut resolvers = Vec::new();
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let mut schema_fields = Vec::new();
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for item in &mut item_impl.items {
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if let ImplItem::Method(method) = item {
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if let Some(field) = args::Field::parse(&method.attrs)? {
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let field_name = field
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.name
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.clone()
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.unwrap_or_else(|| method.sig.ident.to_string());
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let field_desc = field
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.desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let field_deprecation = field
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.deprecation
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let ty = match &method.sig.output {
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ReturnType::Type(_, ty) => {
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if let Type::Path(p) = ty.as_ref() {
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if p.path.is_ident("Result") {
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if let PathArguments::AngleBracketed(args) =
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&p.path.segments[0].arguments
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{
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if args.args.len() == 0 {
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return Err(Error::new_spanned(
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&method.sig.output,
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"Invalid type",
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));
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}
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let mut res = None;
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for arg in &args.args {
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if let GenericArgument::Type(value_ty) = arg {
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res = Some(OutputType::Result(ty, value_ty));
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break;
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}
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}
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if res.is_none() {
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return Err(Error::new_spanned(
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&method.sig.output,
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"Invalid type",
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));
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}
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res.unwrap()
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} else {
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return Err(Error::new_spanned(
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&method.sig.output,
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"Invalid type",
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));
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}
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} else {
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OutputType::Value(ty)
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}
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} else if let Type::Reference(_) = ty.as_ref() {
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OutputType::Value(ty)
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} else {
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return Err(Error::new_spanned(&method.sig.output, "Invalid type"));
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}
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}
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ReturnType::Default => {
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return Err(Error::new_spanned(&method.sig.output, "Missing type"));
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}
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};
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let mut arg_ctx = false;
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let mut args = Vec::new();
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for (idx, arg) in method.sig.inputs.iter_mut().enumerate() {
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if let FnArg::Receiver(receiver) = arg {
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if idx != 0 {
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return Err(Error::new_spanned(
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receiver,
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"The self receiver must be the first parameter.",
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));
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}
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} else if let FnArg::Typed(pat) = arg {
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if idx == 0 {
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// 第一个参数必须是self
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return Err(Error::new_spanned(
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pat,
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"The self receiver must be the first parameter.",
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));
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}
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match (&*pat.pat, &*pat.ty) {
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(Pat::Ident(arg_ident), Type::Path(arg_ty)) => {
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args.push((arg_ident, arg_ty, args::Argument::parse(&pat.attrs)?));
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pat.attrs.clear();
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}
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(_, Type::Reference(TypeReference { elem, .. })) => {
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if let Type::Path(path) = elem.as_ref() {
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if idx != 1
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|| path.path.segments.last().unwrap().ident.to_string()
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!= "Context"
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{
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return Err(Error::new_spanned(
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arg,
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"The Context must be the second argument.",
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));
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}
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arg_ctx = true;
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}
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}
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_ => return Err(Error::new_spanned(arg, "Invalid argument type.")),
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}
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}
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}
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let mut schema_args = Vec::new();
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let mut use_params = Vec::new();
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let mut get_params = Vec::new();
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for (
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ident,
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ty,
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args::Argument {
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name,
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desc,
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default,
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},
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) in args
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{
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let name = name.clone().unwrap_or_else(|| ident.ident.to_string());
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let desc = desc
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.as_ref()
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.map(|s| quote! {Some(#s)})
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.unwrap_or_else(|| quote! {None});
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let schema_default = default
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.as_ref()
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.map(|v| {
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let s = v.to_string();
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quote! {Some(#s)}
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})
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.unwrap_or_else(|| quote! {None});
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schema_args.push(quote! {
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#crate_name::registry::InputValue {
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name: #name,
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description: #desc,
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ty: <#ty as #crate_name::GQLType>::create_type_info(registry),
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default_value: #schema_default,
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}
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});
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use_params.push(quote! { #ident });
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let default = match &default {
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Some(default) => {
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let repr = build_value_repr(&crate_name, &default);
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quote! {|| #repr }
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}
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None => quote! { || #crate_name::Value::Null },
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};
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get_params.push(quote! {
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let #ident: #ty = ctx_field.param_value(#name, #default)?;
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});
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}
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let schema_ty = match &ty {
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OutputType::Result(_, value_ty) => value_ty,
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OutputType::Value(value_ty) => value_ty,
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};
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schema_fields.push(quote! {
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#crate_name::registry::Field {
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name: #field_name,
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description: #field_desc,
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args: vec![#(#schema_args),*],
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ty: <#schema_ty as #crate_name::GQLType>::create_type_info(registry),
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deprecation: #field_deprecation,
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}
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});
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let ctx_field = match arg_ctx {
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true => quote! { &ctx_field, },
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false => quote! {},
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};
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let field_ident = &method.sig.ident;
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let resolve_obj = match &ty {
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OutputType::Value(_) => quote! {
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self.#field_ident(#ctx_field #(#use_params),*).await
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},
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OutputType::Result(_, _) => {
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quote! {
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self.#field_ident(#ctx_field #(#use_params),*).await.
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map_err(|err| err.with_position(field.position))?
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}
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}
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};
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resolvers.push(quote! {
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if field.name.as_str() == #field_name {
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#(#get_params)*
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let ctx_obj = ctx_field.with_item(&field.selection_set);
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let value = #resolve_obj.resolve(&ctx_obj).await.map_err(|err| err.with_position(field.position))?;
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result.insert(field.alias.clone().unwrap_or_else(|| field.name.clone()), value.into());
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continue;
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}
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});
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method.attrs.clear();
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}
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}
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}
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let expanded = quote! {
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#item_impl
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impl #generics #crate_name::GQLType for #self_ty {
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fn type_name() -> std::borrow::Cow<'static, 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) -> String {
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registry.create_type::<Self, _>(|registry| #crate_name::registry::Type::Object {
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name: #gql_typename,
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description: #desc,
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fields: vec![#(#schema_fields),*]
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})
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}
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}
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#[#crate_name::async_trait::async_trait]
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impl #generics #crate_name::GQLOutputValue for #self_ty {
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async fn resolve(&self, ctx: &#crate_name::ContextSelectionSet<'_>) -> #crate_name::Result<#crate_name::serde_json::Value> {
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use #crate_name::ErrorWithPosition;
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if ctx.items.is_empty() {
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#crate_name::anyhow::bail!(#crate_name::QueryError::MustHaveSubFields {
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object: #gql_typename,
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}.with_position(ctx.span.0));
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}
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let mut result = #crate_name::serde_json::Map::<String, #crate_name::serde_json::Value>::new();
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for field in ctx.fields(&*ctx) {
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let field = field?;
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let ctx_field = ctx.with_item(field);
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if ctx_field.is_skip(&field.directives)? {
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continue;
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}
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if field.name.as_str() == "__typename" {
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let name = field.alias.clone().unwrap_or_else(|| field.name.clone());
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result.insert(name, #gql_typename.into());
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continue;
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}
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if field.name.as_str() == "__schema" {
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continue;
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}
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#(#resolvers)*
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#crate_name::anyhow::bail!(#crate_name::QueryError::FieldNotFound {
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field_name: field.name.clone(),
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object: #gql_typename,
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}.with_position(field.position));
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}
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Ok(#crate_name::serde_json::Value::Object(result))
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}
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}
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impl#generics #crate_name::GQLObject for #self_ty {}
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};
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Ok(expanded.into())
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}
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