draconisplusplus/include/rfl/bson/read.hpp

#ifndef RFL_BSON_READ_HPP_
#define RFL_BSON_READ_HPP_

#include <bson/bson.h>
#include <istream>
#include <string>

#include "../Processors.hpp"
#include "../internal/wrap_in_rfl_array_t.hpp"
#include "Parser.hpp"
#include "Reader.hpp"

namespace rfl {
  namespace bson {

    using InputObjectType = typename Reader::InputObjectType;
    using InputVarType    = typename Reader::InputVarType;

    /// Parses an object from a BSON var.
    template <class T, class... Ps>
    Result<internal::wrap_in_rfl_array_t<T>> read(const InputVarType& _obj) {
      const auto r = Reader();
      return Parser<T, Processors<Ps...>>::read(r, _obj);
    }

    /// Parses an BSON object using reflection.
    template <class T, class... Ps>
    auto read(const uint8_t* _bytes, const size_t _size) {
      Reader::BSONValue value;
      value.val_.value.v_doc.data_len = static_cast<uint32_t>(_size);
      value.val_.value.v_doc.data     = const_cast<uint8_t*>(_bytes);
      value.val_.value_type           = BSON_TYPE_DOCUMENT;
      auto doc                        = InputVarType {&value};
      return read<T, Ps...>(doc);
    }

    /// Parses an BSON object using reflection.
    template <class T, class... Ps>
    auto read(const char* _bytes, const size_t _size) {
      return read<T, Ps...>(reinterpret_cast<const uint8_t*>(_bytes), _size);
    }

    /// Parses an object from BSON using reflection.
    template <class T, class... Ps>
    auto read(const std::vector<char>& _bytes) {
      return read<T, Ps...>(_bytes.data(), _bytes.size());
    }

    /// Parses an object from a stream.
    template <class T, class... Ps>
    auto read(std::istream& _stream) {
      std::istreambuf_iterator<char> begin(_stream), end;
      auto                           bytes = std::vector<char>(begin, end);
      return read<T, Ps...>(bytes.data(), bytes.size());
    }

  } // namespace bson
} // namespace rfl

#endif