config_file_parser.hpp

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#ifndef CONFIGURATION_HPP
#define CONFIGURATION_HPP
 
#include "sbpt_generated_includes.hpp"
 
#include <filesystem>
#include <functional>
#include <optional>
#include <string>
#include <unordered_map>
#include <vector>

class Configuration {
  public:
    using SectionKeyPair = std::pair<std::string, std::string>;
    using ConfigLogic = std::function<void(const std::string)>;
    struct PairHash {
        PairHash() = default;
        size_t operator()(const SectionKeyPair &pair) const {
            return std::hash<std::string>()(pair.first) ^ (std::hash<std::string>()(pair.second) << 1);
        }
    };
    using SectionKeyPairToConfigLogic = std::unordered_map<SectionKeyPair, ConfigLogic, PairHash>;
    using ConfigData = std::unordered_map<std::string, std::unordered_map<std::string, std::string>>;
 
    Configuration(const std::filesystem::path &config_path, const SectionKeyPairToConfigLogic &config_logic = {},
                  bool apply = true);
 
    // discards any in-memory changes
    void reload_config_from_file();
 
    void register_config_handler(const std::string &section, const std::string &key,
                                 std::function<void(const std::string)> logic);
 
    // Live configuration modification methods
 
    bool set_value(const std::string &section, const std::string &key, const std::string &value,
                   const bool apply = false);
    std::optional<std::string> get_value(const std::string &section, const std::string &key);
    bool remove_value(const std::string &section, const std::string &key);
 
    // Query methods
 
    bool has_section(const std::string &section) const;
    bool has_value(const std::string &section, const std::string &key);
    std::vector<std::string> get_sections() const;
    std::vector<std::string> get_keys(const std::string &section);
 
    // File operations
 
    bool save_to_file();
    bool save_to_file(const std::filesystem::path &path);
    bool backup_config(const std::filesystem::path &backup_path);
 
    void apply_config_logic_for_key(const std::string &section, const std::string &key);
    void apply_config_logic();
 
  private:
    std::filesystem::path config_path;
    SectionKeyPairToConfigLogic section_key_to_config_logic;
    std::unordered_map<std::string, std::unordered_map<std::string, std::string>> section_to_key_to_value;
    Logger console_logger{"configuration"};
 
    void parse_config_file();
    static std::string trim(const std::string &str);
};
 
#endif // CONFIGURATION_HPP