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Change interfaces to require enums

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This commit is contained in:
Blaine Bublitz 2020-05-10 20:03:13 -07:00
parent 2761224335
commit 9ee269c512
1 changed files with 70 additions and 46 deletions
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116
async-graphql-derive/src/interface.rs
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@ -6,26 +6,25 @@ use inflector::Inflector;
use proc_macro::TokenStream;
use proc_macro2::{Ident, Span};
use quote::quote;
use std::collections::HashSet;
use syn::{Data, DeriveInput, Error, Fields, Result, Type};
pub fn generate(interface_args: &args::Interface, input: &DeriveInput) -> Result<TokenStream> {
let crate_name = get_crate_name(interface_args.internal);
let ident = &input.ident;
let generics = &input.generics;
let attrs = &input.attrs;
let vis = &input.vis;
let s = match &input.data {
Data::Struct(s) => s,
_ => return Err(Error::new_spanned(input, "It should be a struct.")),
};
let fields = match &s.fields {
Fields::Unnamed(fields) => Some(&fields.unnamed),
Fields::Unit => None,
_ => return Err(Error::new_spanned(input, "All fields must be unnamed.")),
Data::Enum(s) => s,
_ => {
return Err(Error::new_spanned(
input,
"Interfaces can only be applied to an enum.",
))
}
};
let extends = interface_args.extends;
let mut enum_names = Vec::new();
let mut enum_items = Vec::new();
let mut enum_items = HashSet::new();
let mut type_into_impls = Vec::new();
let gql_typename = interface_args
.name
@ -45,41 +44,67 @@ pub fn generate(interface_args: &args::Interface, input: &DeriveInput) -> Result
let mut collect_inline_fields = Vec::new();
let mut get_introspection_typename = Vec::new();
if let Some(fields) = fields {
for field in fields {
if let Type::Path(p) = &field.ty {
let enum_name = &p.path.segments.last().unwrap().ident;
enum_items.push(quote! { #enum_name(#p) });
type_into_impls.push(quote! {
impl #generics From<#p> for #ident #generics {
fn from(obj: #p) -> Self {
#ident::#enum_name(obj)
}
}
});
enum_names.push(enum_name);
registry_types.push(quote! {
<#p as #crate_name::Type>::create_type_info(registry);
registry.add_implements(&<#p as #crate_name::Type>::type_name(), #gql_typename);
});
possible_types.push(quote! {
possible_types.insert(<#p as #crate_name::Type>::type_name().to_string());
});
collect_inline_fields.push(quote! {
if let #ident::#enum_name(obj) = self {
return obj.collect_inline_fields(name, ctx, futures);
}
});
get_introspection_typename.push(quote! {
#ident::#enum_name(obj) => <#p as #crate_name::Type>::type_name()
})
} else {
return Err(Error::new_spanned(field, "Invalid type"));
for variant in s.variants.iter() {
let enum_name = &variant.ident;
let field = match &variant.fields {
Fields::Unnamed(fields) if fields.unnamed.len() == 1 => fields.unnamed.first().unwrap(),
Fields::Unnamed(_) => {
return Err(Error::new_spanned(
variant,
"Only single value variants are supported",
))
}
Fields::Unit => {
return Err(Error::new_spanned(
variant,
"Empty variants are not supported",
))
}
Fields::Named(_) => {
return Err(Error::new_spanned(
variant,
"Variants with named fields are not supported",
))
}
};
if let Type::Path(p) = &field.ty {
// This validates that the field type wasn't already used
if enum_items.insert(p) == false {
return Err(Error::new_spanned(
field,
"This type already used in another variant",
));
}
type_into_impls.push(quote! {
impl #generics From<#p> for #ident #generics {
fn from(obj: #p) -> Self {
#ident::#enum_name(obj)
}
}
});
enum_names.push(enum_name);
registry_types.push(quote! {
<#p as #crate_name::Type>::create_type_info(registry);
registry.add_implements(&<#p as #crate_name::Type>::type_name(), #gql_typename);
});
possible_types.push(quote! {
possible_types.insert(<#p as #crate_name::Type>::type_name().to_string());
});
collect_inline_fields.push(quote! {
if let #ident::#enum_name(obj) = self {
return obj.collect_inline_fields(name, ctx, futures);
}
});
get_introspection_typename.push(quote! {
#ident::#enum_name(obj) => <#p as #crate_name::Type>::type_name()
})
} else {
return Err(Error::new_spanned(field, "Invalid type"));
}
}
@ -236,8 +261,7 @@ pub fn generate(interface_args: &args::Interface, input: &DeriveInput) -> Result
};
let expanded = quote! {
#(#attrs)*
#vis enum #ident #generics { #(#enum_items),* }
#input
#(#type_into_impls)*