Add support for new GraphQL grammar/Introspection

Author: wravery

include/SchemaLoader.h

@@ -48,6 +48,7 @@ struct ScalarType
 {
 	std::string_view type;
 	std::string_view description;
+	std::string_view specifiedByURL;
 };
 
 using ScalarTypeList = std::vector<ScalarType>;
@@ -113,6 +114,7 @@ using InputTypeList = std::vector<InputType>;
 struct Directive
 {
 	std::string_view name;
+	bool isRepeatable = false;
 	std::vector<std::string_view> locations;
 	InputFieldList arguments;
 	std::string_view description;
@@ -219,6 +221,7 @@ class SchemaLoader
 	explicit SchemaLoader(SchemaOptions&& schemaOptions);
 
 	bool isIntrospection() const noexcept;
+	std::string_view getSchemaDescription() const noexcept;
 	std::string_view getFilenamePrefix() const noexcept;
 	std::string_view getSchemaNamespace() const noexcept;
 
@@ -265,6 +268,7 @@ class SchemaLoader
 	void visitSchemaDefinition(const peg::ast_node& schemaDefinition);
 	void visitSchemaExtension(const peg::ast_node& schemaExtension);
 	void visitScalarTypeDefinition(const peg::ast_node& scalarTypeDefinition);
+	void visitScalarTypeExtension(const peg::ast_node& scalarTypeExtension);
 	void visitEnumTypeDefinition(const peg::ast_node& enumTypeDefinition);
 	void visitEnumTypeExtension(const peg::ast_node& enumTypeExtension);
 	void visitInputObjectTypeDefinition(const peg::ast_node& inputObjectTypeDefinition);
@@ -294,6 +298,7 @@ class SchemaLoader
 
 	const SchemaOptions _schemaOptions;
 	const bool _isIntrospection;
+	std::string_view _schemaDescription;
 	std::string_view _schemaNamespace;
 	peg::ast _ast;