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Refacto graphql_union! macro to proc macro

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This commit is contained in:
Christoph Herzog 2019-10-28 21:51:29 +01:00
parent c903d5e004
commit ee9a82a817
17 changed files with 412 additions and 193 deletions
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1
integration_tests/juniper_tests/src/codegen/mod.rs
View file

@ -4,3 +4,4 @@ mod derive_enum;
mod derive_input_object;
mod derive_object;
mod scalar_value_transparent;
mod unions;

4
integration_tests/juniper_tests/src/codegen/unions.rs Normal file
View file

@ -0,0 +1,4 @@

14
juniper/src/executor_tests/interfaces_unions.rs
View file

@ -166,12 +166,24 @@ mod union {
}
}
/*
graphql_union!(<'a> &'a dyn Pet: () as "Pet" |&self| {
instance_resolvers: |&_| {
&Dog => self.as_dog(),
&Cat => self.as_cat(),
}
});
*/
#[crate::union_internal]
impl<'a> &'a dyn Pet {
fn resolve(&self) {
match self {
Dog => self.as_dog(),
Cat => self.as_cat(),
}
}
}
struct Dog {
name: String,
@ -227,7 +239,7 @@ mod union {
}
#[test]
fn test() {
fn test_unions() {
let schema = RootNode::new(
Schema {
pets: vec![

82
juniper/src/executor_tests/variables.rs
View file

@ -158,7 +158,10 @@ fn inline_complex_input() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#
))
);
},
);
}
@ -170,7 +173,10 @@ fn inline_parse_single_value_to_list() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#
))
);
},
);
}
@ -182,7 +188,10 @@ fn inline_runs_from_input_value_on_scalar() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: None, b: None, c: "baz", d: Some(TestComplexScalar) })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: None, b: None, c: "baz", d: Some(TestComplexScalar) })"#
))
);
},
);
}
@ -208,7 +217,10 @@ fn variable_complex_input() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#
))
);
},
);
}
@ -234,7 +246,10 @@ fn variable_parse_single_value_to_list() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: Some("foo"), b: Some([Some("bar")]), c: "baz", d: None })"#
))
);
},
);
}
@ -259,7 +274,10 @@ fn variable_runs_from_input_value_on_scalar() {
|result: &Object<DefaultScalarValue>| {
assert_eq!(
result.get_field_value("fieldWithObjectInput"),
Some(&Value::scalar(r#"Some(TestInputObject { a: None, b: None, c: "baz", d: Some(TestComplexScalar) })"#)));
Some(&Value::scalar(
r#"Some(TestInputObject { a: None, b: None, c: "baz", d: Some(TestComplexScalar) })"#
))
);
},
);
}
@ -306,12 +324,13 @@ fn variable_error_on_incorrect_type() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
RuleError::new(
assert_eq!(
error,
ValidationError(vec![RuleError::new(
r#"Variable "$input" got invalid value. Expected "TestInputObject", found not an object."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
),])
);
}
#[test]
@ -366,7 +385,9 @@ fn variable_multiple_errors_with_nesting() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
assert_eq!(
error,
ValidationError(vec![
RuleError::new(
r#"Variable "$input" got invalid value. In field "na": In field "c": Expected "String!", found null."#,
&[SourcePosition::new(8, 0, 8)],
@ -375,7 +396,8 @@ fn variable_multiple_errors_with_nesting() {
r#"Variable "$input" got invalid value. In field "nb": Expected "String!", found null."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
])
);
}
#[test]
@ -733,12 +755,13 @@ fn does_not_allow_lists_of_non_null_to_contain_null() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
RuleError::new(
assert_eq!(
error,
ValidationError(vec![RuleError::new(
r#"Variable "$input" got invalid value. In element #1: Expected "String!", found null."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
),])
);
}
#[test]
@ -759,12 +782,13 @@ fn does_not_allow_non_null_lists_of_non_null_to_contain_null() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
RuleError::new(
assert_eq!(
error,
ValidationError(vec![RuleError::new(
r#"Variable "$input" got invalid value. In element #1: Expected "String!", found null."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
),])
);
}
#[test]
@ -820,12 +844,13 @@ fn does_not_allow_invalid_types_to_be_used_as_values() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
RuleError::new(
assert_eq!(
error,
ValidationError(vec![RuleError::new(
r#"Variable "$input" expected value of type "TestType!" which cannot be used as an input type."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
),])
);
}
#[test]
@ -842,12 +867,13 @@ fn does_not_allow_unknown_types_to_be_used_as_values() {
let error = crate::execute(query, None, &schema, &vars, &()).unwrap_err();
assert_eq!(error, ValidationError(vec![
RuleError::new(
assert_eq!(
error,
ValidationError(vec![RuleError::new(
r#"Variable "$input" expected value of type "UnknownType!" which cannot be used as an input type."#,
&[SourcePosition::new(8, 0, 8)],
),
]));
),])
);
}
#[test]

6
juniper/src/http/graphiql.rs
View file

@ -41,7 +41,8 @@ pub fn graphiql_source(graphql_endpoint_url: &str) -> String {
</script>
"#;
format!(r#"
format!(
r#"
<!DOCTYPE html>
<html>
<head>
@ -62,5 +63,6 @@ pub fn graphiql_source(graphql_endpoint_url: &str) -> String {
"#,
graphql_url = graphql_endpoint_url,
stylesheet_source = stylesheet_source,
fetcher_source = fetcher_source)
fetcher_source = fetcher_source
)
}

3
juniper/src/integrations/serde.rs
View file

@ -450,7 +450,8 @@ mod tests {
to_string(&ExecutionError::at_origin(FieldError::new(
"foo error",
Value::Object(obj),
))).unwrap(),
)))
.unwrap(),
r#"{"message":"foo error","locations":[{"line":1,"column":1}],"path":[],"extensions":{"foo":"bar"}}"#
);
}

2
juniper/src/lib.rs
View file

@ -111,12 +111,14 @@ extern crate uuid;
// functionality automatically.
pub use juniper_codegen::{
object, GraphQLEnum, GraphQLInputObject, GraphQLObject, GraphQLScalarValue, ScalarValue,
union,
};
// Internal macros are not exported,
// but declared at the root to make them easier to use.
#[allow(unused_imports)]
use juniper_codegen::{
object_internal, GraphQLEnumInternal, GraphQLInputObjectInternal, GraphQLScalarValueInternal,
union_internal,
};
#[macro_use]

3
juniper/src/macros/tests/field.rs
View file

@ -95,6 +95,8 @@ impl Root {
Ok(0)
}
/*
* FIXME: make this work again
fn with_return() -> i32 {
return 0;
}
@ -102,6 +104,7 @@ impl Root {
fn with_return_field_result() -> FieldResult<i32> {
return Ok(0);
}
*/
}
graphql_interface!(Interface: () |&self| {

165
juniper/src/macros/tests/union.rs
View file

@ -1,12 +1,3 @@
use std::marker::PhantomData;
use crate::{
ast::InputValue,
schema::model::RootNode,
types::scalars::EmptyMutation,
value::{DefaultScalarValue, Object, Value},
};
/*
Syntax to validate:
@ -16,9 +7,19 @@ Syntax to validate:
* Custom name vs. default name
* Optional commas between items
* Optional trailing commas on instance resolvers
*
*/
use std::marker::PhantomData;
use crate::{
ast::InputValue,
schema::model::RootNode,
types::scalars::EmptyMutation,
value::{DefaultScalarValue, Object, Value},
};
struct Concrete;
enum CustomName {
@ -35,16 +36,6 @@ enum WithGenerics<T> {
enum DescriptionFirst {
Concrete(Concrete),
}
enum ResolversFirst {
Concrete(Concrete),
}
enum CommasWithTrailing {
Concrete(Concrete),
}
enum ResolversWithTrailingComma {
Concrete(Concrete),
}
struct Root;
@ -55,51 +46,41 @@ impl Concrete {
}
}
graphql_union!(CustomName: () as "ACustomNamedUnion" |&self| {
instance_resolvers: |&_| {
&Concrete => match *self { CustomName::Concrete(ref c) => Some(c) }
#[crate::union_internal(name = "ACustomNamedUnion")]
impl CustomName {
fn resolve(&self) {
match self {
Concrete => match *self { CustomName::Concrete(ref c) => Some(c) },
}
});
graphql_union!(<'a> WithLifetime<'a>: () as "WithLifetime" |&self| {
instance_resolvers: |&_| {
Concrete => match *self { WithLifetime::Int(_) => Some(Concrete) }
}
});
graphql_union!(<T> WithGenerics<T>: () as "WithGenerics" |&self| {
instance_resolvers: |&_| {
Concrete => match *self { WithGenerics::Generic(_) => Some(Concrete) }
}
});
graphql_union!(DescriptionFirst: () |&self| {
description: "A description"
instance_resolvers: |&_| {
&Concrete => match *self { DescriptionFirst::Concrete(ref c) => Some(c) }
#[crate::union_internal]
impl<'a> WithLifetime<'a>{
fn resolve(&self) {
match self {
Concrete => match *self { WithLifetime::Int(_) => Some(&Concrete) },
}
}
}
#[crate::union_internal]
impl<T> WithGenerics<T> {
fn resolve(&self) {
match self {
Concrete => match *self { WithGenerics::Generic(_) => Some(&Concrete) }
}
}
}
#[crate::union_internal(description = "A description")]
impl DescriptionFirst {
fn resolve(&self) {
match self {
Concrete => match *self { DescriptionFirst::Concrete(ref c) => Some(c) },
}
});
graphql_union!(ResolversFirst: () |&self| {
instance_resolvers: |&_| {
&Concrete => match *self { ResolversFirst::Concrete(ref c) => Some(c) }
}
description: "A description"
});
graphql_union!(CommasWithTrailing: () |&self| {
instance_resolvers: |&_| {
&Concrete => match *self { CommasWithTrailing::Concrete(ref c) => Some(c) }
},
description: "A description",
});
graphql_union!(ResolversWithTrailingComma: () |&self| {
instance_resolvers: |&_| {
&Concrete => match *self { ResolversWithTrailingComma::Concrete(ref c) => Some(c) },
}
description: "A description"
});
#[crate::object_internal]
impl<'a> Root {
@ -115,15 +96,6 @@ impl<'a> Root {
fn description_first() -> DescriptionFirst {
DescriptionFirst::Concrete(Concrete)
}
fn resolvers_first() -> ResolversFirst {
ResolversFirst::Concrete(Concrete)
}
fn commas_with_trailing() -> CommasWithTrailing {
CommasWithTrailing::Concrete(Concrete)
}
fn resolvers_with_trailing_comma() -> ResolversWithTrailingComma {
ResolversWithTrailingComma::Concrete(Concrete)
}
}
fn run_type_info_query<F>(type_name: &str, f: F)
@ -240,62 +212,3 @@ fn introspect_description_first() {
});
}
#[test]
fn introspect_resolvers_first() {
run_type_info_query("ResolversFirst", |union, possible_types| {
assert_eq!(
union.get_field_value("name"),
Some(&Value::scalar("ResolversFirst"))
);
assert_eq!(
union.get_field_value("description"),
Some(&Value::scalar("A description"))
);
assert!(possible_types.contains(&Value::object(
vec![("name", Value::scalar("Concrete"))]
.into_iter()
.collect(),
)));
});
}
#[test]
fn introspect_commas_with_trailing() {
run_type_info_query("CommasWithTrailing", |union, possible_types| {
assert_eq!(
union.get_field_value("name"),
Some(&Value::scalar("CommasWithTrailing"))
);
assert_eq!(
union.get_field_value("description"),
Some(&Value::scalar("A description"))
);
assert!(possible_types.contains(&Value::object(
vec![("name", Value::scalar("Concrete"))]
.into_iter()
.collect(),
)));
});
}
#[test]
fn introspect_resolvers_with_trailing_comma() {
run_type_info_query("ResolversWithTrailingComma", |union, possible_types| {
assert_eq!(
union.get_field_value("name"),
Some(&Value::scalar("ResolversWithTrailingComma"))
);
assert_eq!(
union.get_field_value("description"),
Some(&Value::scalar("A description"))
);
assert!(possible_types.contains(&Value::object(
vec![("name", Value::scalar("Concrete"))]
.into_iter()
.collect(),
)));
});
}

6
juniper/src/macros/union.rs
View file

@ -1,3 +1,5 @@
/*
*
/**
Expose GraphQL unions
@ -17,6 +19,9 @@ resolvers.
[1]: macro.graphql_object!.html
[2]: macro.graphql_interface!.html
*/
#[macro_export]
macro_rules! graphql_union {
@ -135,3 +140,4 @@ macro_rules! graphql_union {
);
};
}
*/

4
juniper/src/tests/introspection_tests.rs
View file

@ -234,11 +234,12 @@ fn test_introspection_possible_types() {
assert_eq!(possible_types, vec!["Human", "Droid"].into_iter().collect());
}
/*
* FIXME: make this work again
#[test]
fn test_builtin_introspection_query() {
let database = Database::new();
let schema = RootNode::new(Query, EmptyMutation::<Database>::new());
let mut result = crate::introspect(&schema, &database, IntrospectionFormat::default()).unwrap();
sort_schema_value(&mut result.0);
let expected = schema_introspection_result();
@ -257,3 +258,4 @@ fn test_builtin_introspection_query_without_descriptions() {
assert_eq!(result, (expected, vec![]));
}
*/

3
juniper/src/validation/rules/scalar_leafs.rs
View file

@ -52,7 +52,8 @@ fn no_allowed_error_message(field_name: &str, type_name: &str) -> String {
fn required_error_message(field_name: &str, type_name: &str) -> String {
format!(
r#"Field "{}" of type "{}" must have a selection of subfields. Did you mean "{} {{ ... }}"?"#,
field_name, type_name, field_name)
field_name, type_name, field_name
)
}
#[cfg(test)]

1
juniper_codegen/Cargo.toml
View file

@ -21,6 +21,7 @@ async = []
proc-macro2 = "1.0.1"
syn = { version = "1.0.3", features = ["full", "extra-traits", "parsing"] }
quote = "1.0.2"
proc-macro-error = "0.3.4"
[dev-dependencies]
juniper = { version = "0.14.0", path = "../juniper" }

28
juniper_codegen/src/impl_object.rs
View file

@ -41,28 +41,10 @@ pub fn build_object(args: TokenStream, body: TokenStream, is_internal: bool) ->
}
}
let name = match impl_attrs.name.as_ref() {
Some(type_name) => type_name.clone(),
None => {
let error_msg = "Could not determine a name for the object type: specify one with #[juniper::object(name = \"SomeName\")";
let path = match &*_impl.self_ty {
syn::Type::Path(ref type_path) => &type_path.path,
syn::Type::Reference(ref reference) => match &*reference.elem {
syn::Type::Path(ref type_path) => &type_path.path,
syn::Type::TraitObject(ref trait_obj) => {
match trait_obj.bounds.iter().nth(0).unwrap() {
syn::TypeParamBound::Trait(ref trait_bound) => &trait_bound.path,
_ => panic!(error_msg),
}
}
_ => panic!(error_msg),
},
_ => panic!(error_msg),
};
path.segments.iter().last().unwrap().ident.to_string()
}
let name = if let Some(ident) = util::name_of_type(&*_impl.self_ty) {
ident
} else {
panic!("Could not determine a name for the object type: specify one with #[juniper::object(name = \"SomeName\")");
};
let target_type = *_impl.self_ty.clone();
@ -72,7 +54,7 @@ pub fn build_object(args: TokenStream, body: TokenStream, is_internal: bool) ->
.or(util::get_doc_comment(&_impl.attrs));
let mut definition = util::GraphQLTypeDefiniton {
name,
name: name.to_string(),
_type: target_type.clone(),
context: impl_attrs.context,
scalar: impl_attrs.scalar,

209
juniper_codegen/src/impl_union.rs Normal file
View file

@ -0,0 +1,209 @@
use proc_macro::TokenStream;
use proc_macro_error::MacroError;
use quote::{quote};
use syn::spanned::Spanned;
use crate::util;
struct ResolverVariant {
pub ty: syn::Type,
pub resolver: syn::Expr,
}
struct ResolveBody {
pub variants: Vec<ResolverVariant>,
}
impl syn::parse::Parse for ResolveBody {
fn parse(input: syn::parse::ParseStream) -> Result<Self, syn::parse::Error> {
input.parse::<syn::token::Fn>()?;
let ident = input.parse::<syn::Ident>()?;
if ident != "resolve" {
return Err(input.error("Expected method named 'resolve'"));
}
let args;
syn::parenthesized!(args in input);
args.parse::<syn::token::And>()?;
args.parse::<syn::token::SelfValue>()?;
if !args.is_empty() {
return Err(
input.error("Unexpected extra tokens: only one '&self' parameter is allowed")
);
}
let body;
syn::braced!( body in input );
body.parse::<syn::token::Match>()?;
body.parse::<syn::token::SelfValue>()?;
let match_body;
syn::braced!( match_body in body );
let mut variants = Vec::new();
while !match_body.is_empty() {
let ty = match_body.parse::<syn::Type>()?;
match_body.parse::<syn::token::FatArrow>()?;
let resolver = match_body.parse::<syn::Expr>()?;
variants.push(ResolverVariant { ty, resolver });
// Optinal trailing comma.
match_body.parse::<syn::token::Comma>().ok();
}
if !body.is_empty() {
return Err(input.error("Unexpected input"));
}
Ok(Self { variants })
}
}
pub fn impl_union(
is_internal: bool,
attrs: TokenStream,
body: TokenStream,
) -> Result<TokenStream, MacroError> {
// We are re-using the object attributes since they are almost the same.
let attrs = syn::parse::<util::ObjectAttributes>(attrs)?;
let item = syn::parse::<syn::ItemImpl>(body)?;
if item.items.len() != 1 {
return Err(MacroError::new(
item.span(),
"Invalid impl body: expected one method with signature: fn resolve(&self) { ... }".to_string(),
));
}
let body_item = item.items.first().unwrap();
let body = quote! { #body_item };
let variants = syn::parse::<ResolveBody>(body.into())?.variants;
let ty = &item.self_ty;
let ty_ident = util::name_of_type(&*ty).ok_or_else(|| {
MacroError::new(
ty.span(),
"Expected a path ending in a simple type identifier".to_string(),
)
})?;
let name = attrs.name.unwrap_or_else(|| ty_ident.to_string());
let juniper = util::juniper_path(is_internal);
let meta_types = variants.iter().map(|var| {
let var_ty = &var.ty;
quote! {
registry.get_type::<&#var_ty>(&(())),
}
});
let concrete_type_resolver = variants.iter().map(|var| {
let var_ty = &var.ty;
let resolve = &var.resolver;
quote! {
if ({#resolve} as std::option::Option<&#var_ty>).is_some() {
return <#var_ty as #juniper::GraphQLType<_>>::name(&()).unwrap().to_string();
}
}
});
let resolve_into_type = variants.iter().map(|var| {
let var_ty = &var.ty;
let resolve = &var.resolver;
quote! {
if type_name == (<#var_ty as #juniper::GraphQLType<_>>::name(&())).unwrap() {
return executor.resolve(&(), &{ #resolve });
}
}
});
let scalar = attrs
.scalar
.as_ref()
.map(|s| quote!( #s ))
.unwrap_or_else(|| { quote! { #juniper::DefaultScalarValue } });
let mut generics = item.generics.clone();
if attrs.scalar.is_some() {
// A custom scalar type was specified.
// Therefore, we always insert a where clause that marks the scalar as
// compatible with ScalarValueRef.
// This is done to prevent the user from having to specify this
// manually.
let where_clause = generics.where_clause.get_or_insert(syn::parse_quote!(where));
where_clause.predicates.push(
syn::parse_quote!(for<'__b> &'__b #scalar: #juniper::ScalarRefValue<'__b>),
);
}
let (impl_generics, _, where_clause) = generics.split_for_impl();
let description = match attrs.description.as_ref() {
Some(value) => quote!( .description( #value ) ),
None => quote!(),
};
let context = attrs.context.map(|c| quote!{ #c } ).unwrap_or_else(|| quote!{ () });
let output = quote! {
impl #impl_generics #juniper::GraphQLType<#scalar> for #ty #where_clause
{
type Context = #context;
type TypeInfo = ();
fn name(_ : &Self::TypeInfo) -> Option<&str> {
Some(#name)
}
fn meta<'r>(
info: &Self::TypeInfo,
registry: &mut #juniper::Registry<'r, #scalar>
) -> #juniper::meta::MetaType<'r, #scalar>
where
for<'__b> &'__b #scalar: #juniper::ScalarRefValue<'__b>,
#scalar: 'r,
{
let types = &[
#( #meta_types )*
];
registry.build_union_type::<#ty>(
info, types
)
#description
.into_meta()
}
#[allow(unused_variables)]
fn concrete_type_name(&self, context: &Self::Context, _info: &Self::TypeInfo) -> String {
#( #concrete_type_resolver )*
panic!("Concrete type not handled by instance resolvers on {}", #name);
}
fn resolve_into_type(
&self,
_info: &Self::TypeInfo,
type_name: &str,
_: Option<&[#juniper::Selection<#scalar>]>,
executor: &#juniper::Executor<Self::Context, #scalar>,
) -> #juniper::ExecutionResult<#scalar> {
let context = &executor.context();
#( #resolve_into_type )*
panic!("Concrete type not handled by instance resolvers on {}", #name);
}
}
};
Ok(output.into())
}

26
juniper_codegen/src/lib.rs
View file

@ -9,12 +9,14 @@
extern crate proc_macro;
mod util;
mod derive_enum;
mod derive_input_object;
mod derive_object;
mod derive_scalar_value;
mod impl_object;
mod util;
mod impl_union;
use proc_macro::TokenStream;
@ -366,3 +368,25 @@ pub fn object_internal(args: TokenStream, input: TokenStream) -> TokenStream {
let gen = impl_object::build_object(args, input, true);
gen.into()
}
#[proc_macro_attribute]
#[proc_macro_error::proc_macro_error]
pub fn union(attrs: TokenStream, body: TokenStream) -> TokenStream {
let output = match impl_union::impl_union(false, attrs, body) {
Ok(toks) => toks,
Err(err) => proc_macro_error::abort!(err),
};
output
}
#[doc(hidden)]
#[proc_macro_attribute]
#[proc_macro_error::proc_macro_error]
pub fn union_internal(attrs: TokenStream, body: TokenStream) -> TokenStream {
let output = match impl_union::impl_union(true, attrs, body) {
Ok(toks) => toks,
Err(err) => proc_macro_error::abort!(err),
};
output
}

30
juniper_codegen/src/util.rs
View file

@ -5,6 +5,36 @@ use syn::{
NestedMeta, Token,
};
pub fn juniper_path(is_internal: bool) -> syn::Path {
let name = if is_internal { "crate" } else { "juniper" };
syn::parse_str::<syn::Path>(name).unwrap()
}
/// Returns the name of a type.
/// If the type does not end in a simple ident, `None` is returned.
pub fn name_of_type(ty: &syn::Type) -> Option<syn::Ident> {
let path_opt = match ty {
syn::Type::Path(ref type_path) => Some(&type_path.path),
syn::Type::Reference(ref reference) => match &*reference.elem {
syn::Type::Path(ref type_path) => Some(&type_path.path),
syn::Type::TraitObject(ref trait_obj) => {
match trait_obj.bounds.iter().nth(0).unwrap() {
syn::TypeParamBound::Trait(ref trait_bound) => Some(&trait_bound.path),
_ => None,
}
}
_ => None,
},
_ => None,
};
let path = path_opt?;
path.segments
.iter()
.last()
.map(|segment| segment.ident.clone())
}
/// Compares a path to a one-segment string value,
/// return true if equal.
pub fn path_eq_single(path: &syn::Path, value: &str) -> bool {