231 lines
9.1 KiB
C++
231 lines
9.1 KiB
C++
#ifndef RFL_PARSING_PARSER_DEFAULT_HPP_
|
|
#define RFL_PARSING_PARSER_DEFAULT_HPP_
|
|
|
|
#include <map>
|
|
#include <stdexcept>
|
|
#include <type_traits>
|
|
|
|
#include "../Result.hpp"
|
|
#include "../always_false.hpp"
|
|
#include "../from_named_tuple.hpp"
|
|
#include "../internal/enums/StringConverter.hpp"
|
|
#include "../internal/has_reflection_method_v.hpp"
|
|
#include "../internal/has_reflection_type_v.hpp"
|
|
#include "../internal/is_basic_type.hpp"
|
|
#include "../internal/is_description.hpp"
|
|
#include "../internal/is_literal.hpp"
|
|
#include "../internal/is_validator.hpp"
|
|
#include "../internal/processed_t.hpp"
|
|
#include "../internal/to_ptr_named_tuple.hpp"
|
|
#include "../to_view.hpp"
|
|
#include "../type_name_t.hpp"
|
|
#include "AreReaderAndWriter.hpp"
|
|
#include "Parent.hpp"
|
|
#include "Parser_base.hpp"
|
|
#include "is_tagged_union_wrapper.hpp"
|
|
#include "schema/Type.hpp"
|
|
|
|
namespace rfl {
|
|
namespace parsing {
|
|
|
|
/// Default case - anything that cannot be explicitly matched.
|
|
template <class R, class W, class T, class ProcessorsType>
|
|
requires AreReaderAndWriter<R, W, T>
|
|
struct Parser {
|
|
public:
|
|
using InputVarType = typename R::InputVarType;
|
|
using OutputVarType = typename W::OutputVarType;
|
|
|
|
using ParentType = Parent<W>;
|
|
|
|
/// Expresses the variables as type T.
|
|
static Result<T> read(const R& _r, const InputVarType& _var) noexcept {
|
|
if constexpr (R::template has_custom_constructor<T>) {
|
|
return _r.template use_custom_constructor<T>(_var);
|
|
} else {
|
|
if constexpr (internal::has_reflection_type_v<T>) {
|
|
using ReflectionType = std::remove_cvref_t<typename T::ReflectionType>;
|
|
const auto wrap_in_t = [](auto _named_tuple) -> Result<T> {
|
|
try {
|
|
return T(_named_tuple);
|
|
} catch (std::exception& e) { return Error(e.what()); }
|
|
};
|
|
return Parser<R, W, ReflectionType, ProcessorsType>::read(_r, _var).and_then(wrap_in_t);
|
|
} else if constexpr (std::is_class_v<T> && std::is_aggregate_v<T>) {
|
|
return read_struct(_r, _var);
|
|
} else if constexpr (std::is_enum_v<T>) {
|
|
using StringConverter = internal::enums::StringConverter<T>;
|
|
return _r.template to_basic_type<std::string>(_var).and_then(
|
|
StringConverter::string_to_enum
|
|
);
|
|
} else {
|
|
return _r.template to_basic_type<std::remove_cvref_t<T>>(_var);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class P>
|
|
static void write(const W& _w, const T& _var, const P& _parent) noexcept {
|
|
if constexpr (internal::has_reflection_type_v<T>) {
|
|
using ReflectionType = std::remove_cvref_t<typename T::ReflectionType>;
|
|
if constexpr (internal::has_reflection_method_v<T>) {
|
|
Parser<R, W, ReflectionType, ProcessorsType>::write(_w, _var.reflection(), _parent);
|
|
} else {
|
|
const auto& [r] = _var;
|
|
Parser<R, W, ReflectionType, ProcessorsType>::write(_w, r, _parent);
|
|
}
|
|
} else if constexpr (std::is_class_v<T> && std::is_aggregate_v<T>) {
|
|
const auto ptr_named_tuple =
|
|
ProcessorsType::template process<T>(internal::to_ptr_named_tuple(_var));
|
|
using PtrNamedTupleType = std::remove_cvref_t<decltype(ptr_named_tuple)>;
|
|
Parser<R, W, PtrNamedTupleType, ProcessorsType>::write(_w, ptr_named_tuple, _parent);
|
|
} else if constexpr (std::is_enum_v<T>) {
|
|
using StringConverter = internal::enums::StringConverter<T>;
|
|
const auto str = StringConverter::enum_to_string(_var);
|
|
ParentType::add_value(_w, str, _parent);
|
|
} else {
|
|
ParentType::add_value(_w, _var, _parent);
|
|
}
|
|
}
|
|
|
|
/// Generates a schema for the underlying type.
|
|
static schema::Type to_schema(std::map<std::string, schema::Type>* _definitions) {
|
|
using U = std::remove_cvref_t<T>;
|
|
using Type = schema::Type;
|
|
if constexpr (std::is_same<U, bool>()) {
|
|
return Type { Type::Boolean {} };
|
|
|
|
} else if constexpr (std::is_same<U, std::int32_t>()) {
|
|
return Type { Type::Int32 {} };
|
|
|
|
} else if constexpr (std::is_same<U, std::int64_t>()) {
|
|
return Type { Type::Int64 {} };
|
|
|
|
} else if constexpr (std::is_same<U, std::uint32_t>()) {
|
|
return Type { Type::UInt32 {} };
|
|
|
|
} else if constexpr (std::is_same<U, std::uint64_t>()) {
|
|
return Type { Type::UInt64 {} };
|
|
|
|
} else if constexpr (std::is_integral<U>()) {
|
|
return Type { Type::Integer {} };
|
|
|
|
} else if constexpr (std::is_same<U, float>()) {
|
|
return Type { Type::Float {} };
|
|
|
|
} else if constexpr (std::is_floating_point_v<U>) {
|
|
return Type { Type::Double {} };
|
|
|
|
} else if constexpr (std::is_same<U, std::string>()) {
|
|
return Type { Type::String {} };
|
|
|
|
} else if constexpr (rfl::internal::is_description_v<U>) {
|
|
return make_description<U>(_definitions);
|
|
|
|
} else if constexpr (std::is_enum_v<U>) {
|
|
return make_enum<U>(_definitions);
|
|
|
|
} else if constexpr (std::is_class_v<U> && std::is_aggregate_v<U>) {
|
|
return make_reference<U>(_definitions);
|
|
|
|
} else if constexpr (internal::is_literal_v<U>) {
|
|
return Type { Type::Literal { .values_ = U::strings() } };
|
|
|
|
} else if constexpr (internal::is_validator_v<U>) {
|
|
return make_validated<U>(_definitions);
|
|
|
|
} else if constexpr (internal::has_reflection_type_v<U>) {
|
|
return Parser<R, W, typename U::ReflectionType, ProcessorsType>::to_schema(_definitions);
|
|
|
|
} else {
|
|
static_assert(rfl::always_false_v<U>, "Unsupported type.");
|
|
}
|
|
}
|
|
|
|
private:
|
|
template <class U>
|
|
static schema::Type make_description(std::map<std::string, schema::Type>* _definitions) {
|
|
using Type = schema::Type;
|
|
return Type {
|
|
Type::Description {
|
|
.description_ = typename U::Content().str(),
|
|
.type_ = Ref<Type>::make(
|
|
Parser<R, W, std::remove_cvref_t<typename U::Type>, ProcessorsType>::to_schema(
|
|
_definitions
|
|
)
|
|
) }
|
|
};
|
|
}
|
|
|
|
template <class U>
|
|
static schema::Type make_enum(std::map<std::string, schema::Type>* _definitions) {
|
|
using Type = schema::Type;
|
|
using S = internal::enums::StringConverter<U>;
|
|
if constexpr (S::is_flag_enum_) {
|
|
return Type { Type::String {} };
|
|
} else {
|
|
return Parser<R, W, typename S::NamesLiteral, ProcessorsType>::to_schema(_definitions);
|
|
}
|
|
}
|
|
|
|
template <class U>
|
|
static schema::Type make_reference(std::map<std::string, schema::Type>* _definitions) {
|
|
using Type = schema::Type;
|
|
const auto name = make_type_name<U>();
|
|
if (_definitions->find(name) == _definitions->end()) {
|
|
(*_definitions)[name] = Type { Type::Integer {} }; // Placeholder to avoid infinite loop.
|
|
using NamedTupleType = internal::processed_t<U, ProcessorsType>;
|
|
(*_definitions)[name] =
|
|
Parser<R, W, NamedTupleType, ProcessorsType>::to_schema(_definitions);
|
|
}
|
|
return Type { Type::Reference { name } };
|
|
}
|
|
|
|
template <class U>
|
|
static schema::Type make_validated(std::map<std::string, schema::Type>* _definitions) {
|
|
using Type = schema::Type;
|
|
using ReflectionType = std::remove_cvref_t<typename U::ReflectionType>;
|
|
using ValidationType = std::remove_cvref_t<typename U::ValidationType>;
|
|
return Type {
|
|
Type::Validated { .type_ = Ref<Type>::make(
|
|
Parser<R, W, ReflectionType, ProcessorsType>::to_schema(_definitions)
|
|
), .validation_ = ValidationType::template to_schema<ReflectionType>() }
|
|
};
|
|
}
|
|
|
|
template <class U>
|
|
static std::string make_type_name() {
|
|
if constexpr (is_tagged_union_wrapper_v<U>) {
|
|
return replace_non_alphanumeric(type_name_t<typename U::Type>().str() + "__tagged");
|
|
} else {
|
|
return replace_non_alphanumeric(type_name_t<U>().str());
|
|
}
|
|
}
|
|
|
|
/// The way this works is that we allocate space on the stack in this size
|
|
/// of the struct in which we then write the individual fields using views
|
|
/// and placement new. This is how we deal with the fact that some fields
|
|
/// might not be default-constructible.
|
|
static Result<T> read_struct(const R& _r, const InputVarType& _var) {
|
|
alignas(T) unsigned char buf[sizeof(T)];
|
|
auto ptr = reinterpret_cast<T*>(buf);
|
|
auto view = ProcessorsType::template process<T>(to_view(*ptr));
|
|
using ViewType = std::remove_cvref_t<decltype(view)>;
|
|
const auto err = Parser<R, W, ViewType, ProcessorsType>::read_view(_r, _var, &view);
|
|
if (err) [[unlikely]] {
|
|
return *err;
|
|
}
|
|
return std::move(*ptr);
|
|
}
|
|
|
|
static std::string replace_non_alphanumeric(std::string _str) {
|
|
for (auto& ch : _str) { ch = std::isalnum(ch) ? ch : '_'; }
|
|
return _str;
|
|
}
|
|
};
|
|
|
|
} // namespace parsing
|
|
} // namespace rfl
|
|
|
|
#endif
|