draconisplusplus/include/rfl/xml/read.hpp

#ifndef RFL_XML_READ_HPP_
#define RFL_XML_READ_HPP_

#include <istream>
#include <pugixml.hpp>
#include <string>

#include "../Processors.hpp"
#include "../internal/get_type_name.hpp"
#include "../internal/remove_namespaces.hpp"
#include "Parser.hpp"
#include "Reader.hpp"

namespace rfl {
  namespace xml {

    using InputVarType = typename Reader::InputVarType;

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

    /// Parses an object from XML using reflection.
    template <class T, class... Ps>
    Result<T> read(const std::string& _xml_str) {
      pugi::xml_document doc;
      const auto         result = doc.load_string(_xml_str.c_str());
      if (!result) {
        return Error(
            "XML string could not be parsed: " +
            std::string(result.description())
        );
      }
      const auto var = InputVarType(doc.first_child());
      return read<T, Ps...>(var);
    }

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

  } // namespace xml
} // namespace rfl

#endif