YAMLReader.h

#pragma once
 
#include <optional>
#include <variant>
#include <vector>
 
#include <yaml-cpp/yaml.h>
 
#include "ConfigFileReader.h"
 
namespace iguana {

  class YAMLReader : public ConfigFileReader
  {
 
    public:

      using node_finder_t = std::function<YAML::Node(YAML::Node const)>;

      using node_id_t = std::variant<std::string, node_finder_t>;

      using node_path_t = std::deque<node_id_t>;

      YAMLReader(std::string_view name = "config")
          : ConfigFileReader(name)
      {}
      ~YAMLReader() {}

      void LoadFiles();

      std::optional<YAML::Node> GetNode(node_path_t node_path);

      static std::string NodePath2String(node_path_t const& node_path);

      template <typename SCALAR>
      std::optional<SCALAR> GetScalar(YAML::Node node);

      template <typename SCALAR>
      std::optional<SCALAR> GetScalar(node_path_t node_path);

      template <typename SCALAR>
      std::optional<std::vector<SCALAR>> GetVector(YAML::Node node);

      template <typename SCALAR>
      std::optional<std::vector<SCALAR>> GetVector(node_path_t node_path);

      template <typename SCALAR>
      node_finder_t InRange(std::string const& key, SCALAR val);
 
    private:

      YAML::Node FindNode(YAML::Node node, node_path_t node_path);

      std::deque<std::pair<YAML::Node, std::string>> m_configs;
  };
}