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(const YAML::Node)>;
 
      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();
 
      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;
  };
}