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#pragma once
#include <forstio/common.hpp>
#include <forstio/string_literal.hpp>
namespace saw {
namespace schema {
// NOLINTBEGIN
template <typename T, string_literal Literal> struct Member {
static constexpr string_literal name = "Member";
using ValueType = T;
static constexpr string_literal KeyLiteral = Literal;
};
template <typename... T> struct Struct {
static_assert(
always_false<T...>,
"This schema template doesn't support this type of template argument");
};
template <typename... V, string_literal... K>
struct Struct<Member<V, K>...> {
static constexpr string_literal name = "Struct";
};
template <typename... T> struct Union {
static_assert(
always_false<T...>,
"This schema template doesn't support this type of template argument");
};
template <typename... V, string_literal... K>
struct Union<Member<V, K>...> {
static constexpr string_literal name = "Union";
};
template <typename T, size_t Dim = 1> struct Array {
static constexpr string_literal name = "Array";
};
template<typename T, size_t... S> struct FixedArray {
static constexpr string_literal name = "FixedArray";
};
template <typename... T> struct Tuple {
static constexpr string_literal name = "Tuple";
};
/**
* This acts as a separator of different encodings being mashed together
* For example we can transport any base64 encodings in JSON
*
* using WrappedExample = schema::Tuple<
* schema::Wrapper<schema::String, encode::Base64>
* >;
*
* data<WrappedExample, encode::Json> ex_data;
*/
template <typename T, typename Enc>
class Wrapper {
static constexpr string_literal name = "Wrapper";
};
struct String {
static constexpr string_literal name = "String";
};
struct SignedInteger {
static constexpr string_literal name = "SignedInteger";
};
struct UnsignedInteger {
static constexpr string_literal name = "UnsignedInteger";
};
struct FloatingPoint {
static constexpr string_literal name = "FloatingPoint";
};
template <class T, size_t N> struct Primitive {
static_assert(((std::is_same_v<T, SignedInteger> ||
std::is_same_v<T, UnsignedInteger>)&&(N == 1 || N == 2 ||
N == 4 || N == 8)) ||
(std::is_same_v<T, FloatingPoint> && (N == 4 || N == 8)),
"Primitive Type is not supported");
static constexpr string_literal name = "Primitive";
};
using Int8 = Primitive<SignedInteger, 1>;
using Int16 = Primitive<SignedInteger, 2>;
using Int32 = Primitive<SignedInteger, 4>;
using Int64 = Primitive<SignedInteger, 8>;
using UInt8 = Primitive<UnsignedInteger, 1>;
using UInt16 = Primitive<UnsignedInteger, 2>;
using UInt32 = Primitive<UnsignedInteger, 4>;
using UInt64 = Primitive<UnsignedInteger, 8>;
using Float32 = Primitive<FloatingPoint, 4>;
using Float64 = Primitive<FloatingPoint, 8>;
/**
* Classes allowing to distinguish Ints from VarInts
*/
template<typename T, std::size_t MaxLen>
struct VariableLengthPrimitive {
static constexpr string_literal name = "VariableLengthPrimitive";
};
using VarInt = VariableLengthPrimitive<SignedInteger, 5>;
using VarLong = VariableLengthPrimitive<SignedInteger, 10>;
/**
* Classes enabling Rpc calls
*/
template <class Request, class Response>
struct Function {
static constexpr string_literal name = "Function";
using RequestT = Request;
using ResponseT = Response;
};
template <class... T> struct Interface {
static_assert(
always_false<T...>,
"This schema template doesn't support this type of template argument");
static constexpr string_literal name = "Interface";
};
template <class... Requests, class... Responses, string_literal... Names>
struct Interface<Member<Function<Requests, Responses>,Names>...> {
static constexpr string_literal name = "Interface";
};
// NOLINTEND
} // namespace schema
template<typename T, typename Schema>
struct schema_has_member{
static_assert(
always_false<T, Schema>,
"Not supported schema case");
};
/**
* Checks if identical type exists in schema structure
*/
template<typename T, typename... Members>
struct schema_has_member<T, schema::Struct<Members...>> {
private:
template<size_t i>
static constexpr bool value_element() {
if constexpr ( i < sizeof...(Members) ){
using MT = typename parameter_pack_type<i, Members...>::type;
if constexpr ( std::is_same_v<T,MT> ) {
return true;
} else {
return value_element<i+1u>();
}
}
return false;
}
public:
static constexpr bool value = value_element<0>();
};
/**
*
*/
template<string_literal Key, typename Schema>
struct schema_has_key {
static_assert(
always_false<Schema>,
"Not supported schema case");
};
template<string_literal Key, typename... Members>
struct schema_has_key<Key, schema::Struct<Members...>> {
private:
template<size_t i>
static constexpr bool value_element() {
if constexpr ( i < sizeof...(Members) ){
using MT = typename parameter_pack_type<i, Members...>::type;
if constexpr ( Key == MT::KeyLiteral ) {
return true;
}else{
return value_element<i+1u>();
}
}
return false;
}
public:
static constexpr bool value = value_element<0>();
};
template<string_literal Name, typename Iface>
struct schema_member_index {
static_assert(
always_false<Iface>,
"Not supported schema case");
};
template<string_literal Name, typename... MemberVals, string_literal... MemberKeys >
struct schema_member_index<Name, schema::Interface<schema::Member<MemberVals, MemberKeys>...>> {
static constexpr uint64_t value = parameter_key_pack_index<Name, MemberKeys...>::value;
};
template<string_literal Name, typename Iface>
struct schema_member_type {
static_assert(
always_false<Iface>,
"Not supported schema case");
};
template<string_literal Name, typename... MemberVals, string_literal... MemberKeys >
struct schema_member_type<Name, schema::Interface<schema::Member<MemberVals, MemberKeys>...>> {
using type = typename parameter_pack_type<schema_member_index<Name, schema::Interface<schema::Member<MemberVals,MemberKeys>...>>::value, MemberVals...>::type;
};
template <class T> struct is_struct {
constexpr static bool value = false;
};
template <class... V, string_literal... K> struct is_struct<schema::Struct<schema::Member<V,K>...>> {
constexpr static bool value = true;
};
template <class T> struct is_string {
constexpr static bool value = false;
};
template <> struct is_string<schema::String> {
constexpr static bool value = true;
};
template <class T> struct is_tuple {
constexpr static bool value = false;
};
template <class... T> struct is_tuple<schema::Tuple<T...>> {
constexpr static bool value = true;
};
template <class T> struct is_array {
constexpr static bool value = false;
};
template <class T, size_t Dim> struct is_array<schema::Array<T,Dim>> {
constexpr static bool value = true;
};
template <class T> struct is_primitive {
constexpr static bool value = false;
};
template <typename T, size_t N> struct is_primitive<schema::Primitive<T,N>> {
constexpr static bool value = true;
};
} // namespace saw
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