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#pragma once
#include "schema.h"
#include <variant>
#include <vector>
namespace saw {
template <class T> class message_container;
template <class T, class Container = message_container<T>> class message;
template <size_t N, class... T> struct message_parameter_pack_type;
template <class TN, class... T>
struct message_parameter_pack_type<0, TN, T...> {
using Type = TN;
};
template <size_t N, class TN, class... T>
struct message_parameter_pack_type<N, TN, T...> {
static_assert(sizeof...(T) > 0, "Exhausted parameters");
using Type = typename message_parameter_pack_type<N - 1, T...>::Type;
};
template <class T, class... TL> struct MessageParameterPackIndex;
template <class T, class... TL> struct MessageParameterPackIndex<T, T, TL...> {
static constexpr size_t Value = 0u;
};
template <class T, class TL0, class... TL>
struct MessageParameterPackIndex<T, TL0, TL...> {
static constexpr size_t Value =
1u + MessageParameterPackIndex<T, TL...>::Value;
};
/*
* Nightmare inducing compiler problems found here. Somehow non-type
* StringLiterals cannot be resolved as non-type primitive template values can.
* This is the workaround
*/
template <string_literal V, string_literal Key0, string_literal... Keys>
struct message_parameter_key_pack_index_helper {
static constexpr size_t Value =
(V == Key0)
? (0u)
: (1u + message_parameter_key_pack_index_helper<V, Keys...>::Value);
};
template <string_literal V, string_literal Key0>
struct message_parameter_key_pack_index_helper<V, Key0> {
static constexpr size_t Value = (V == Key0) ? (0u) : (1u);
};
template <string_literal V, string_literal... Keys>
struct message_parameter_key_pack_index {
static constexpr size_t Value =
message_parameter_key_pack_index_helper<V, Keys...>::Value;
static_assert(Value < sizeof...(Keys),
"Provided StringLiteral doesn't exist in searched list");
};
template <class T> struct schema_is_array {
constexpr static bool Value = false;
};
template <class T> struct schema_is_array<schema::Array<T>> {
constexpr static bool Value = true;
};
template <class... V, string_literal... Keys>
class message_container<schema::Struct<schema::NamedMember<V, Keys>...>> {
private:
using ValueType = std::tuple<message<V, message_container<V>>...>;
ValueType values_;
public:
using SchemaType = schema::Struct<schema::NamedMember<V, Keys>...>;
template <size_t i>
using ElementType = typename message_parameter_pack_type<
i, message<V, message_container<V>>...>::Type;
template <size_t i> ElementType<i> &get() { return std::get<i>(values_); }
};
/*
* Union storage
*/
template <class... V, string_literal... Keys>
class message_container<schema::Union<schema::NamedMember<V, Keys>...>> {
private:
using ValueType = std::variant<message<V, message_container<V>>...>;
ValueType value_;
public:
using SchemaType = schema::Union<schema::NamedMember<V, Keys>...>;
template <size_t i>
using ElementType = typename message_parameter_pack_type<
i, message<V, message_container<V>>...>::Type;
template <size_t i> ElementType<i> &get() {
if (i != value_.index()) {
using MessageIV =
typename message_parameter_pack_type<i, V...>::Type;
value_ = message<MessageIV, message_container<MessageIV>>{};
}
return std::get<i>(value_);
}
size_t index() const noexcept { return value_.index(); }
};
/*
* Array storage
*/
template <class T> class message_container<schema::Array<T>> {
private:
using ValueType = std::vector<message<T, message_container<T>>>;
ValueType values_;
public:
using SchemaType = schema::Array<T>;
using ElementType = message<T, message_container<T>>;
message<T, message_container<T>> &get(size_t index) {
return values_.at(index);
}
void resize(size_t size) { values_.resize(size); }
size_t size() const { return values_.size(); }
};
/*
* Tuple storage
*/
template <class... T> class message_container<schema::Tuple<T...>> {
private:
using ValueType = std::tuple<message<T, message_container<T>>...>;
ValueType values_;
public:
using SchemaType = schema::Tuple<T...>;
template <size_t i>
using ElementType = typename message_parameter_pack_type<
i, message<T, message_container<T>>...>::Type;
template <size_t i> ElementType<i> &get() { return std::get<i>(values_); }
};
/*
* Helper for the basic message container, so the class doesn't have to be
* specialized 10 times.
*/
template <class T> struct PrimitiveTypeHelper;
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::SignedInteger, 1>> {
using Type = int8_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::SignedInteger, 2>> {
using Type = int16_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::SignedInteger, 4>> {
using Type = int32_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::SignedInteger, 8>> {
using Type = int64_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::UnsignedInteger, 1>> {
using Type = uint8_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::UnsignedInteger, 2>> {
using Type = uint16_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::UnsignedInteger, 4>> {
using Type = uint32_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::UnsignedInteger, 8>> {
using Type = uint64_t;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::FloatingPoint, 4>> {
using Type = float;
};
template <>
struct PrimitiveTypeHelper<schema::Primitive<schema::FloatingPoint, 8>> {
using Type = double;
};
template <class T, size_t N> class message_container<schema::Primitive<T, N>> {
public:
using SchemaType = schema::Primitive<T, N>;
using ValueType =
typename PrimitiveTypeHelper<schema::Primitive<T, N>>::Type;
private:
ValueType value_;
public:
message_container() : value_{0} {}
void set(const ValueType &v) { value_ = v; }
const ValueType &get() const { return value_; }
};
template <> class message_container<schema::String> {
public:
using SchemaType = schema::String;
using ValueType = std::string;
using ValueViewType = std::string_view;
private:
ValueType value_;
public:
void set(ValueType &&v) { value_ = std::move(v); }
void set(const ValueType &v) { value_ = v; }
void set(const ValueViewType v) { value_ = std::string{v}; }
const ValueType &get() const { return value_; }
};
} // namespace saw
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