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