draconisplusplus/include/rfl/json/read.hpp

#ifndef RFL_JSON_READ_HPP_
#define RFL_JSON_READ_HPP_

#include <istream>
#include <string>
#include <yyjson.h>

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

namespace rfl {
  namespace json {

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

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

    /// Parses an object from JSON using reflection.
    template <class T, class... Ps>
    Result<internal::wrap_in_rfl_array_t<T>> read(const std::string& _json_str
    ) {
      yyjson_doc* doc = yyjson_read(_json_str.c_str(), _json_str.size(), 0);
      if (!doc) { return Error("Could not parse document"); }
      yyjson_val* root = yyjson_doc_get_root(doc);
      const auto  r    = Reader();
      auto res = Parser<T, Processors<Ps...>>::read(r, InputVarType(root));
      yyjson_doc_free(doc);
      return res;
    }

    /// Parses an object from a stringstream.
    template <class T, class... Ps>
    auto read(std::istream& _stream) {
      const auto json_str = std::string(
          std::istreambuf_iterator<char>(_stream),
          std::istreambuf_iterator<char>()
      );
      return read<T, Ps...>(json_str);
    }

  } // namespace json
} // namespace rfl

#endif