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SchemaLoader.cpp
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1933 lines (1607 loc) · 48 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
#include "SchemaLoader.h"
#include <cctype>
#include <fstream>
#include <iostream>
#include <regex>
#include <set>
#include <sstream>
#include <stdexcept>
#include <tuple>
using namespace std::literals;
namespace graphql::generator {
const std::string_view SchemaLoader::s_introspectionNamespace = "introspection"sv;
const BuiltinTypeMap SchemaLoader::s_builtinTypes = {
{ "Int"sv, BuiltinType::Int },
{ "Float"sv, BuiltinType::Float },
{ "String"sv, BuiltinType::String },
{ "Boolean"sv, BuiltinType::Boolean },
{ "ID"sv, BuiltinType::ID },
};
const CppTypeMap SchemaLoader::s_builtinCppTypes = {
"int"sv,
"double"sv,
"std::string"sv,
"bool"sv,
"response::IdType"sv,
};
const std::string_view SchemaLoader::s_scalarCppType = R"cpp(response::Value)cpp"sv;
SchemaLoader::SchemaLoader(SchemaOptions&& schemaOptions)
: _schemaOptions(std::move(schemaOptions))
, _isIntrospection(_schemaOptions.isIntrospection)
, _schemaNamespace(_schemaOptions.schemaNamespace)
{
_ast = peg::parseSchemaFile(_schemaOptions.schemaFilename);
if (!_ast.root)
{
throw std::logic_error("Unable to parse the service schema, but there was no error "
"message from the parser!");
}
// Visit all of the definitions in the first pass.
for (const auto& child : _ast.root->children)
{
if (!isExtension(*child))
{
visitDefinition(*child);
}
}
// Visit all of the extensions in a second pass.
for (const auto& child : _ast.root->children)
{
if (isExtension(*child))
{
visitDefinition(*child);
}
}
validateSchema();
}
void SchemaLoader::validateSchema()
{
// Verify that none of the custom types conflict with a built-in type.
for (const auto& entry : _schemaTypes)
{
if (s_builtinTypes.find(entry.first) != s_builtinTypes.cend())
{
std::ostringstream error;
auto itrPosition = _typePositions.find(entry.first);
error << "Builtin type overridden: " << entry.first;
if (itrPosition != _typePositions.cend())
{
error << " line: " << itrPosition->second.line
<< " column: " << itrPosition->second.column;
}
throw std::runtime_error(error.str());
}
}
// Fixup all of the fieldType members.
for (auto& entry : _inputTypes)
{
fixupInputFieldList(entry.fields);
}
// Handle nested input types by fully declaring the dependencies first.
reorderInputTypeDependencies();
// Validate the interface dependencies and that all of the interface fields are implemented.
validateImplementedInterfaces();
for (auto& entry : _interfaceTypes)
{
fixupOutputFieldList(entry.fields, std::nullopt, std::nullopt);
}
if (!_isIntrospection)
{
bool queryDefined = false;
if (_operationTypes.empty())
{
// Fill in the operations with default type names if present.
constexpr auto strDefaultQuery = "Query"sv;
constexpr auto strDefaultMutation = "Mutation"sv;
constexpr auto strDefaultSubscription = "Subscription"sv;
if (_objectNames.find(strDefaultQuery) != _objectNames.cend())
{
_operationTypes.push_back(
{ strDefaultQuery, getSafeCppName(strDefaultQuery), service::strQuery });
queryDefined = true;
}
if (_objectNames.find(strDefaultMutation) != _objectNames.cend())
{
_operationTypes.push_back({ strDefaultMutation,
getSafeCppName(strDefaultMutation),
service::strMutation });
}
if (_objectNames.find(strDefaultSubscription) != _objectNames.cend())
{
_operationTypes.push_back({ strDefaultSubscription,
getSafeCppName(strDefaultSubscription),
service::strSubscription });
}
}
else
{
// Validate that all of the operation types exist and that query is defined.
for (const auto& operation : _operationTypes)
{
if (_objectNames.find(operation.type) == _objectNames.cend())
{
std::ostringstream error;
error << "Unknown operation type: " << operation.type
<< " operation: " << operation.operation;
throw std::runtime_error(error.str());
}
queryDefined = queryDefined || (operation.operation == service::strQuery);
}
}
if (!queryDefined)
{
throw std::runtime_error("Query operation type undefined");
}
}
else if (!_operationTypes.empty())
{
throw std::runtime_error("Introspection should not define any operation types");
}
std::string_view mutationType;
for (const auto& operation : _operationTypes)
{
if (operation.operation == service::strMutation)
{
mutationType = operation.type;
break;
}
}
for (auto& entry : _objectTypes)
{
auto interfaceFields = std::make_optional<std::unordered_set<std::string_view>>();
auto accessor = (mutationType == entry.type)
? std::make_optional<std::string_view>(strApply)
: std::nullopt;
for (const auto& interfaceName : entry.interfaces)
{
auto itr = _interfaceNames.find(interfaceName);
if (itr != _interfaceNames.cend())
{
for (const auto& field : _interfaceTypes[itr->second].fields)
{
interfaceFields->insert(field.name);
}
}
}
fixupOutputFieldList(entry.fields, interfaceFields, accessor);
}
// Validate the objects that are possible types for unions and add the unions to
// the list of matching types for the objects.
for (const auto& entry : _unionTypes)
{
for (const auto& objectName : entry.options)
{
auto itr = _objectNames.find(objectName);
if (itr == _objectNames.cend())
{
std::ostringstream error;
auto itrPosition = _typePositions.find(entry.type);
error << "Unknown type: " << objectName << " included by: " << entry.type;
if (itrPosition != _typePositions.cend())
{
error << " line: " << itrPosition->second.line
<< " column: " << itrPosition->second.column;
}
throw std::runtime_error(error.str());
}
_objectTypes[itr->second].unions.push_back(entry.type);
}
}
}
void SchemaLoader::fixupOutputFieldList(OutputFieldList& fields,
const std::optional<std::unordered_set<std::string_view>>& interfaceFields,
const std::optional<std::string_view>& accessor)
{
for (auto& entry : fields)
{
if (interfaceFields)
{
entry.interfaceField = false;
entry.inheritedField = interfaceFields->find(entry.name) != interfaceFields->cend();
}
else
{
entry.interfaceField = true;
entry.inheritedField = false;
}
if (accessor)
{
entry.accessor = *accessor;
}
if (s_builtinTypes.find(entry.type) != s_builtinTypes.cend())
{
continue;
}
auto itr = _schemaTypes.find(entry.type);
if (itr == _schemaTypes.cend())
{
std::ostringstream error;
error << "Unknown field type: " << entry.type;
if (entry.position)
{
error << " line: " << entry.position->line << " column: " << entry.position->column;
}
throw std::runtime_error(error.str());
}
switch (itr->second)
{
case SchemaType::Scalar:
entry.fieldType = OutputFieldType::Scalar;
break;
case SchemaType::Enum:
entry.fieldType = OutputFieldType::Enum;
break;
case SchemaType::Union:
entry.fieldType = OutputFieldType::Union;
break;
case SchemaType::Interface:
entry.fieldType = OutputFieldType::Interface;
break;
case SchemaType::Object:
entry.fieldType = OutputFieldType::Object;
break;
default:
{
std::ostringstream error;
error << "Invalid field type: " << entry.type;
if (entry.position)
{
error << " line: " << entry.position->line
<< " column: " << entry.position->column;
}
throw std::runtime_error(error.str());
}
}
fixupInputFieldList(entry.arguments);
}
}
void SchemaLoader::fixupInputFieldList(InputFieldList& fields)
{
for (auto& entry : fields)
{
if (s_builtinTypes.find(entry.type) != s_builtinTypes.cend())
{
continue;
}
auto itr = _schemaTypes.find(entry.type);
if (itr == _schemaTypes.cend())
{
std::ostringstream error;
error << "Unknown argument type: " << entry.type;
if (entry.position)
{
error << " line: " << entry.position->line << " column: " << entry.position->column;
}
throw std::runtime_error(error.str());
}
switch (itr->second)
{
case SchemaType::Scalar:
entry.fieldType = InputFieldType::Scalar;
break;
case SchemaType::Enum:
entry.fieldType = InputFieldType::Enum;
break;
case SchemaType::Input:
entry.fieldType = InputFieldType::Input;
break;
default:
{
std::ostringstream error;
error << "Invalid argument type: " << entry.type;
if (entry.position)
{
error << " line: " << entry.position->line
<< " column: " << entry.position->column;
}
throw std::runtime_error(error.str());
}
}
}
}
void SchemaLoader::reorderInputTypeDependencies()
{
// Build the dependency list for each input type.
std::for_each(_inputTypes.begin(), _inputTypes.end(), [](InputType& entry) noexcept {
std::for_each(entry.fields.cbegin(),
entry.fields.cend(),
[&entry](const InputField& field) noexcept {
if (field.fieldType == InputFieldType::Input)
{
// https://spec.graphql.org/October2021/#sec-Input-Objects.Circular-References
if (!field.modifiers.empty()
&& field.modifiers.front() != service::TypeModifier::None)
{
entry.declarations.push_back(field.type);
}
else
{
entry.dependencies.insert(field.type);
}
}
});
});
std::unordered_set<std::string_view> handled;
auto itr = _inputTypes.begin();
while (itr != _inputTypes.end())
{
// Put all of the input types without unhandled dependencies at the front.
const auto itrDependent = std::stable_partition(itr,
_inputTypes.end(),
[&handled](const InputType& entry) noexcept {
return std::find_if(entry.dependencies.cbegin(),
entry.dependencies.cend(),
[&handled](std::string_view dependency) noexcept {
return handled.find(dependency) == handled.cend();
})
== entry.dependencies.cend();
});
// Check to make sure we made progress.
if (itrDependent == itr)
{
std::ostringstream error;
error << "Input object cycle type: " << itr->type;
throw std::runtime_error(error.str());
}
if (itrDependent != _inputTypes.end())
{
std::for_each(itr, itrDependent, [&handled](const InputType& entry) noexcept {
handled.insert(entry.type);
});
}
itr = itrDependent;
}
}
void SchemaLoader::validateImplementedInterfaces() const
{
for (const auto& interfaceType : _interfaceTypes)
{
validateTransitiveInterfaces(interfaceType.type, interfaceType.interfaces);
for (auto interfaceName : interfaceType.interfaces)
{
validateInterfaceFields(interfaceType.type, interfaceName, interfaceType.fields);
}
}
for (const auto& objectType : _objectTypes)
{
validateTransitiveInterfaces(objectType.type, objectType.interfaces);
for (auto interfaceName : objectType.interfaces)
{
validateInterfaceFields(objectType.type, interfaceName, objectType.fields);
}
}
}
bool SchemaLoader::isExtension(const peg::ast_node& definition) noexcept
{
return definition.is_type<peg::schema_extension>()
|| definition.is_type<peg::scalar_type_extension>()
|| definition.is_type<peg::enum_type_extension>()
|| definition.is_type<peg::input_object_type_extension>()
|| definition.is_type<peg::union_type_extension>()
|| definition.is_type<peg::interface_type_extension>()
|| definition.is_type<peg::object_type_extension>();
}
void SchemaLoader::visitDefinition(const peg::ast_node& definition)
{
if (definition.is_type<peg::schema_definition>())
{
visitSchemaDefinition(definition);
}
else if (definition.is_type<peg::schema_extension>())
{
visitSchemaExtension(definition);
}
else if (definition.is_type<peg::scalar_type_definition>())
{
visitScalarTypeDefinition(definition);
}
else if (definition.is_type<peg::scalar_type_extension>())
{
visitScalarTypeExtension(definition);
}
else if (definition.is_type<peg::enum_type_definition>())
{
visitEnumTypeDefinition(definition);
}
else if (definition.is_type<peg::enum_type_extension>())
{
visitEnumTypeExtension(definition);
}
else if (definition.is_type<peg::input_object_type_definition>())
{
visitInputObjectTypeDefinition(definition);
}
else if (definition.is_type<peg::input_object_type_extension>())
{
visitInputObjectTypeExtension(definition);
}
else if (definition.is_type<peg::union_type_definition>())
{
visitUnionTypeDefinition(definition);
}
else if (definition.is_type<peg::union_type_extension>())
{
visitUnionTypeExtension(definition);
}
else if (definition.is_type<peg::interface_type_definition>())
{
visitInterfaceTypeDefinition(definition);
}
else if (definition.is_type<peg::interface_type_extension>())
{
visitInterfaceTypeExtension(definition);
}
else if (definition.is_type<peg::object_type_definition>())
{
visitObjectTypeDefinition(definition);
}
else if (definition.is_type<peg::object_type_extension>())
{
visitObjectTypeExtension(definition);
}
else if (definition.is_type<peg::directive_definition>())
{
visitDirectiveDefinition(definition);
}
else
{
const auto position = definition.begin();
std::ostringstream error;
error << "Unexpected executable definition line: " << position.line
<< " column: " << position.column;
throw std::runtime_error(error.str());
}
}
void SchemaLoader::visitSchemaDefinition(const peg::ast_node& schemaDefinition)
{
std::string_view description;
peg::on_first_child<peg::description>(schemaDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
if (_schemaDescription.empty())
{
_schemaDescription = description;
}
peg::for_each_child<peg::root_operation_definition>(schemaDefinition,
[this](const peg::ast_node& child) {
const auto operation(child.children.front()->string_view());
const auto name(child.children.back()->string_view());
const auto cppName(getSafeCppName(name));
_operationTypes.push_back({ name, cppName, operation });
});
}
void SchemaLoader::visitSchemaExtension(const peg::ast_node& schemaExtension)
{
peg::for_each_child<peg::operation_type_definition>(schemaExtension,
[this](const peg::ast_node& child) {
const auto operation(child.children.front()->string_view());
const auto name(child.children.back()->string_view());
const auto cppName(getSafeCppName(name));
_operationTypes.push_back({ name, cppName, operation });
});
}
void SchemaLoader::visitObjectTypeDefinition(const peg::ast_node& objectTypeDefinition)
{
std::string_view name;
std::string_view description;
peg::on_first_child<peg::object_name>(objectTypeDefinition,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
peg::on_first_child<peg::description>(objectTypeDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
_schemaTypes[name] = SchemaType::Object;
_typePositions.emplace(name, objectTypeDefinition.begin());
_objectNames[name] = _objectTypes.size();
auto cppName = getSafeCppName(name);
_objectTypes.push_back({ name, cppName, {}, {}, {}, description });
visitObjectTypeExtension(objectTypeDefinition);
}
void SchemaLoader::visitObjectTypeExtension(const peg::ast_node& objectTypeExtension)
{
std::string_view name;
peg::on_first_child<peg::object_name>(objectTypeExtension,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
const auto itrType = _objectNames.find(name);
if (itrType != _objectNames.cend())
{
auto& objectType = _objectTypes[itrType->second];
peg::for_each_child<peg::interface_type>(objectTypeExtension,
[&objectType](const peg::ast_node& child) {
objectType.interfaces.push_back(child.string_view());
});
peg::on_first_child<peg::fields_definition>(objectTypeExtension,
[&objectType](const peg::ast_node& child) {
auto fields = getOutputFields(child.children);
objectType.fields.reserve(objectType.fields.size() + fields.size());
for (auto& field : fields)
{
objectType.fields.push_back(std::move(field));
}
});
if (!_isIntrospection)
{
for (const auto& field : objectType.fields)
{
blockReservedName(field.name, field.position);
for (const auto& argument : field.arguments)
{
blockReservedName(argument.name, argument.position);
}
}
}
}
}
void SchemaLoader::visitInterfaceTypeDefinition(const peg::ast_node& interfaceTypeDefinition)
{
std::string_view name;
std::string_view description;
peg::on_first_child<peg::interface_name>(interfaceTypeDefinition,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
peg::on_first_child<peg::description>(interfaceTypeDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
_schemaTypes[name] = SchemaType::Interface;
_typePositions.emplace(name, interfaceTypeDefinition.begin());
_interfaceNames[name] = _interfaceTypes.size();
auto cppName = getSafeCppName(name);
_interfaceTypes.push_back({ name, cppName, {}, {}, description });
visitInterfaceTypeExtension(interfaceTypeDefinition);
}
void SchemaLoader::visitInterfaceTypeExtension(const peg::ast_node& interfaceTypeExtension)
{
std::string_view name;
peg::on_first_child<peg::interface_name>(interfaceTypeExtension,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
const auto itrType = _interfaceNames.find(name);
if (itrType != _interfaceNames.cend())
{
auto& interfaceType = _interfaceTypes[itrType->second];
peg::for_each_child<peg::interface_type>(interfaceTypeExtension,
[&interfaceType](const peg::ast_node& child) {
interfaceType.interfaces.push_back(child.string_view());
});
peg::on_first_child<peg::fields_definition>(interfaceTypeExtension,
[&interfaceType](const peg::ast_node& child) {
auto fields = getOutputFields(child.children);
interfaceType.fields.reserve(interfaceType.fields.size() + fields.size());
for (auto& field : fields)
{
interfaceType.fields.push_back(std::move(field));
}
});
if (!_isIntrospection)
{
for (const auto& field : interfaceType.fields)
{
blockReservedName(field.name, field.position);
for (const auto& argument : field.arguments)
{
blockReservedName(argument.name, argument.position);
}
}
}
}
}
void SchemaLoader::visitInputObjectTypeDefinition(const peg::ast_node& inputObjectTypeDefinition)
{
std::string_view name;
std::string_view description;
peg::on_first_child<peg::object_name>(inputObjectTypeDefinition,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
peg::on_first_child<peg::description>(inputObjectTypeDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
_schemaTypes[name] = SchemaType::Input;
_typePositions.emplace(name, inputObjectTypeDefinition.begin());
_inputNames[name] = _inputTypes.size();
auto cppName = getSafeCppName(name);
_inputTypes.push_back({ name, cppName, {}, description });
visitInputObjectTypeExtension(inputObjectTypeDefinition);
}
void SchemaLoader::visitInputObjectTypeExtension(const peg::ast_node& inputObjectTypeExtension)
{
std::string_view name;
peg::on_first_child<peg::object_name>(inputObjectTypeExtension,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
const auto itrType = _inputNames.find(name);
if (itrType != _inputNames.cend())
{
auto& inputType = _inputTypes[itrType->second];
peg::on_first_child<peg::input_fields_definition>(inputObjectTypeExtension,
[&inputType](const peg::ast_node& child) {
auto fields = getInputFields(child.children);
inputType.fields.reserve(inputType.fields.size() + fields.size());
for (auto& field : fields)
{
inputType.fields.push_back(std::move(field));
}
});
if (!_isIntrospection)
{
for (const auto& field : inputType.fields)
{
blockReservedName(field.name, field.position);
}
}
}
}
void SchemaLoader::visitEnumTypeDefinition(const peg::ast_node& enumTypeDefinition)
{
std::string_view name;
std::string_view description;
peg::on_first_child<peg::enum_name>(enumTypeDefinition,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
peg::on_first_child<peg::description>(enumTypeDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
_schemaTypes[name] = SchemaType::Enum;
_typePositions.emplace(name, enumTypeDefinition.begin());
_enumNames[name] = _enumTypes.size();
auto cppName = getSafeCppName(name);
_enumTypes.push_back({ name, cppName, {}, description });
visitEnumTypeExtension(enumTypeDefinition);
}
void SchemaLoader::visitEnumTypeExtension(const peg::ast_node& enumTypeExtension)
{
std::string_view name;
peg::on_first_child<peg::enum_name>(enumTypeExtension,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
const auto itrType = _enumNames.find(name);
if (itrType != _enumNames.cend())
{
auto& enumType = _enumTypes[itrType->second];
peg::for_each_child<
peg::enum_value_definition>(enumTypeExtension, [&enumType](const peg::ast_node& child) {
EnumValueType value;
peg::on_first_child<peg::enum_value>(child, [&value](const peg::ast_node& enumValue) {
value.value = enumValue.string_view();
value.cppValue = getSafeCppName(value.value);
});
peg::on_first_child<peg::description>(child,
[&value](const peg::ast_node& description) {
if (!description.children.empty())
{
value.description = description.children.front()->unescaped_view();
}
});
peg::on_first_child<peg::directives>(child, [&value](const peg::ast_node& directives) {
peg::for_each_child<peg::directive>(directives,
[&value](const peg::ast_node& directive) {
std::string_view directiveName;
peg::on_first_child<peg::directive_name>(directive,
[&directiveName](const peg::ast_node& name) {
directiveName = name.string_view();
});
if (directiveName == "deprecated"sv)
{
peg::on_first_child<peg::arguments>(directive,
[&value](const peg::ast_node& arguments) {
peg::on_first_child<peg::argument>(arguments,
[&value](const peg::ast_node& argument) {
std::string_view argumentName;
peg::on_first_child<peg::argument_name>(argument,
[&argumentName](const peg::ast_node& name) {
argumentName = name.string_view();
});
if (argumentName == "reason"sv)
{
peg::on_first_child<peg::string_value>(argument,
[&value](const peg::ast_node& argumentValue) {
value.deprecationReason =
argumentValue.unescaped_view();
});
}
});
});
}
});
});
value.position = child.begin();
enumType.values.push_back(std::move(value));
});
}
}
void SchemaLoader::visitScalarTypeDefinition(const peg::ast_node& scalarTypeDefinition)
{
std::string_view name;
std::string_view description;
peg::on_first_child<peg::scalar_name>(scalarTypeDefinition,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
peg::on_first_child<peg::description>(scalarTypeDefinition,
[&description](const peg::ast_node& child) {
if (!child.children.empty())
{
description = child.children.front()->unescaped_view();
}
});
_schemaTypes[name] = SchemaType::Scalar;
_typePositions.emplace(name, scalarTypeDefinition.begin());
_scalarNames[name] = _scalarTypes.size();
_scalarTypes.push_back({ name, description });
visitScalarTypeExtension(scalarTypeDefinition);
}
void SchemaLoader::visitScalarTypeExtension(const peg::ast_node& scalarTypeExtension)
{
std::string_view name;
peg::on_first_child<peg::scalar_name>(scalarTypeExtension,
[isIntrospection = _isIntrospection, &name](const peg::ast_node& child) {
name = child.string_view();
if (!isIntrospection)
{
blockReservedName(name, child.begin());
}
});
const auto itrType = _scalarNames.find(name);
if (itrType != _scalarNames.cend())
{
auto& scalarType = _scalarTypes[itrType->second];
peg::on_first_child<peg::directives>(scalarTypeExtension,
[&scalarType](const peg::ast_node& directives) {
peg::for_each_child<peg::directive>(directives,
[&scalarType](const peg::ast_node& directive) {
std::string_view directiveName;
peg::on_first_child<peg::directive_name>(directive,
[&directiveName](const peg::ast_node& name) {
directiveName = name.string_view();
});
if (directiveName == "specifiedBy"sv)
{
std::string_view specifiedByURL;
peg::on_first_child<peg::arguments>(directive,
[&specifiedByURL](const peg::ast_node& arguments) {
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