2020-03-01 10:54:34 +00:00
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use crate::args;
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use proc_macro::TokenStream;
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use proc_macro2::Span;
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use quote::quote;
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use syn::{Data, DeriveInput, Error, Ident, Result};
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pub fn generate(object_args: &args::Object, input: &DeriveInput) -> Result<TokenStream> {
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let attrs = &input.attrs;
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let vis = &input.vis;
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let ident = &input.ident;
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let s = match &input.data {
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Data::Struct(s) => s,
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_ => return Err(Error::new_spanned(input, "It should be a struct.")),
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};
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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(|| ident.to_string());
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let trait_ident = Ident::new(&format!("{}Fields", ident.to_string()), Span::call_site());
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let mut new_fields = Vec::new();
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let mut trait_fns = Vec::new();
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let mut resolvers = Vec::new();
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for field in &s.fields {
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if let Some(field_args) = args::Field::parse(&field.attrs)? {
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// is field
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let vis = &field.vis;
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let ty = &field.ty;
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let ident = field.ident.as_ref().unwrap();
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let field_name = ident.to_string();
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if field_args.is_attr {
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new_fields.push(quote! { #vis #ident: #ty });
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}
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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 use_params = Vec::new();
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for arg in &field_args.arguments {
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let name = Ident::new(&arg.name, Span::call_site());
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let ty = &arg.ty;
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let name_str = name.to_string();
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decl_params.push(quote! { #name: #ty });
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get_params.push(quote! {
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let #name: #ty = ctx_field.param_value(#name_str)?;
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});
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use_params.push(quote! { #name });
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}
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trait_fns.push(quote! {
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async fn #ident(&self, ctx: &async_graphql::ContextField<'_>, #(#decl_params),*) -> async_graphql::Result<#ty>;
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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 obj = #trait_ident::#ident(&self, &ctx_field, #(#use_params),*).await.
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map_err(|err| err.with_position(field.position))?;
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let ctx_obj = ctx_field.with_item(&field.selection_set);
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let value = obj.resolve(&ctx_obj).await.
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map_err(|err| err.with_position(field.position))?;
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result.insert(#field_name.to_string(), value.into());
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continue;
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}
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});
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} else {
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new_fields.push(quote! { #field });
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}
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}
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let expanded = quote! {
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#(#attrs)*
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#vis struct #ident {
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#(#new_fields),*
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}
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#[async_graphql::async_trait::async_trait]
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#vis trait #trait_ident {
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#(#trait_fns)*
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}
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impl async_graphql::GQLType for #ident {
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fn type_name() -> String {
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#gql_typename.to_string()
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}
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}
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#[async_graphql::async_trait::async_trait]
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impl async_graphql::GQLOutputValue for #ident {
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async fn resolve(self, ctx: &async_graphql::ContextSelectionSet<'_>) -> async_graphql::Result<async_graphql::serde_json::Value> {
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2020-03-01 13:35:39 +00:00
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use async_graphql::ErrorWithPosition;
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2020-03-01 10:54:34 +00:00
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if ctx.items.is_empty() {
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2020-03-01 13:35:39 +00:00
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async_graphql::anyhow::bail!(async_graphql::QueryError::MustHaveSubFields {
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2020-03-01 10:54:34 +00:00
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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 = async_graphql::serde_json::Map::<String, async_graphql::serde_json::Value>::new();
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for selection in &ctx.items {
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match selection {
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async_graphql::graphql_parser::query::Selection::Field(field) => {
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let ctx_field = ctx.with_item(field);
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if field.name.as_str() == "__typename" {
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result.insert("__typename".to_string(), #gql_typename.into());
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continue;
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}
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#(#resolvers)*
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2020-03-01 13:35:39 +00:00
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async_graphql::anyhow::bail!(async_graphql::QueryError::FieldNotFound {
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2020-03-01 10:54:34 +00:00
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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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_ => {}
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}
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}
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Ok(async_graphql::serde_json::Value::Object(result))
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}
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}
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impl async_graphql::GQLObject for #ident {}
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};
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Ok(expanded.into())
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}
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