Fix #100

Author: wravery

include/graphqlservice/GraphQLGrammar.h

@@ -1107,7 +1107,7 @@ struct directive_definition_start
 };
 
 struct directive_definition_content
-	: seq<star<ignored>, one<'@'>, directive_name, arguments_definition, plus<ignored>, on_keyword, plus<ignored>, directive_locations>
+	: seq<star<ignored>, one<'@'>, directive_name, opt<star<ignored>, arguments_definition>, plus<ignored>, on_keyword, plus<ignored>, directive_locations>
 {
 };
 

samples/schema.today.graphql

@@ -9,6 +9,8 @@ schema {
 
 scalar ItemCursor
 
+directive @id on FIELD_DEFINITION
+
 "Root Query type"
 type Query {
     """[Object Identification](https://facebook.github.io/relay/docs/en/graphql-server-specification.html#object-identification)"""

samples/separate/TodaySchema.cpp

@@ -183,6 +183,9 @@ void AddTypesToSchema(const std::shared_ptr<introspection::Schema>& schema)
 	AddNestedTypeDetails(typeNestedType, schema);
 	AddExpensiveDetails(typeExpensive, schema);
 
+	schema->AddDirective(std::make_shared<introspection::Directive>("id", R"md()md", std::vector<response::StringType>({
+		R"gql(FIELD_DEFINITION)gql"
+	}), std::vector<std::shared_ptr<introspection::InputValue>>()));
 	schema->AddDirective(std::make_shared<introspection::Directive>("subscriptionTag", R"md()md", std::vector<response::StringType>({
 		R"gql(SUBSCRIPTION)gql"
 	}), std::vector<std::shared_ptr<introspection::InputValue>>({

samples/unified/TodaySchema.cpp

@@ -1194,6 +1194,9 @@ void AddTypesToSchema(const std::shared_ptr<introspection::Schema>& schema)
 		std::make_shared<introspection::Field>("order", R"md()md", std::nullopt, std::vector<std::shared_ptr<introspection::InputValue>>(), schema->WrapType(introspection::TypeKind::NON_NULL, schema->LookupType("Int")))
 	});
 
+	schema->AddDirective(std::make_shared<introspection::Directive>("id", R"md()md", std::vector<response::StringType>({
+		R"gql(FIELD_DEFINITION)gql"
+	}), std::vector<std::shared_ptr<introspection::InputValue>>()));
 	schema->AddDirective(std::make_shared<introspection::Directive>("subscriptionTag", R"md()md", std::vector<response::StringType>({
 		R"gql(SUBSCRIPTION)gql"
 	}), std::vector<std::shared_ptr<introspection::InputValue>>({