array.hpp

#pragma once
 
#include <vector>
 
#include <userver/formats/json/value.hpp>
#include <userver/formats/parse/common_containers.hpp>
#include <userver/formats/parse/to.hpp>
#include <userver/utils/meta.hpp>
 
#include <userver/chaotic/validators.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace chaotic {
 
template <typename ItemType, typename UserType, typename... Validators>
struct Array final {
  const UserType& value;
};
 
template <typename Value, typename ItemType, typename UserType,
          typename... Validators>
UserType Parse(const Value& value,
               formats::parse::To<Array<ItemType, UserType, Validators...>>) {
  UserType arr;
  auto inserter = std::inserter(arr, arr.end());
  if constexpr (meta::kIsReservable<UserType>) {
    arr.reserve(value.GetSize());
  }
  for (const auto& item : value) {
    *inserter = item.template As<ItemType>();
    ++inserter;
  }
 
  chaotic::Validate<Validators...>(arr, value);
 
  return arr;
}
 
template <typename Value, typename ItemType, typename... Validators>
std::vector<formats::common::ParseType<Value, ItemType>> Parse(
    const Value& value,
    formats::parse::To<Array<
        ItemType, std::vector<formats::common::ParseType<Value, ItemType>>,
        Validators...>>) {
  std::vector<formats::common::ParseType<Value, ItemType>> arr;
  arr.reserve(value.GetSize());
  for (const auto& item : value) {
    arr.emplace_back(item.template As<ItemType>());
  }
 
  chaotic::Validate<Validators...>(arr, value);
 
  return arr;
}
 
template <typename Value, typename ItemType, typename UserType,
          typename... Validators>
Value Serialize(const Array<ItemType, UserType, Validators...>& ps,
                formats::serialize::To<Value>) {
  typename Value::Builder vb{formats::common::Type::kArray};
  for (const auto& item : ps.value) {
    vb.PushBack(ItemType{item});
  }
  return vb.ExtractValue();
}
 
}  // namespace chaotic
 
USERVER_NAMESPACE_END