227 lines
7.2 KiB
C++
227 lines
7.2 KiB
C++
/* +------------------------------------------------------+
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____/ \____ /| - Open source game framework licensed to freely use, |
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\ / / | copy, modify and sell without restriction |
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+--\ ^__^ /--+ | |
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| ~/ \~ | | - created for <https://foam.shampoo.ooo> |
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| ~~~~~~~~~~~~ | +------------------------------------------------------+
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| SPACE ~~~~~ | /
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| ~~~~~~~ BOX |/
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+-------------*/
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#pragma once
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#include <fstream>
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#include <ostream>
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#include <iomanip>
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#include "json/json.hpp"
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#include "filesystem.hpp"
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#include "Node.hpp"
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#include "Animation.hpp"
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#include "Log.hpp"
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#include "extension.hpp"
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class Configuration : public Node
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{
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private:
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Animation auto_refresher = Animation(&Configuration::refresh, this);
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fs::file_time_type config_file_modification_time;
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nlohmann::json config;
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fs::path file_to_refresh;
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/*!
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* Fill the config JSON with default values set by the framework.
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*/
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void set_defaults();
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/*!
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* Pass a JSON object along with key names to get value at the specified hierarchy of keys.
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*
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* @warning This probably should not be called directly and is just used to provide a recursive call for variadic
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* access through Configuration::operator()
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*
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* @param json a JSON element in the configuration
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* @param key first-level key
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* @param keys zero or more next level keys
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*/
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template<class Key, class... Keys>
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const nlohmann::json& access(const nlohmann::json& json, const Key& key, const Keys&... keys) const
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{
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if constexpr (sizeof...(keys) > 0)
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{
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return access(json[key], keys...);
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}
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else
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{
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return json[key];
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}
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}
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public:
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/*!
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* Construct a Configuration object. The path argument is the location to look for a user configuration. If valid JSON is found,
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* it will be merged into the hard-coded default assignments, overwriting any existing key/value pairs. The path will be watched
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* for changes if auto refresh is turned on.
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*
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* @param parent SPACEBOX Node rooted at the Game object
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*/
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Configuration(Node* parent);
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/*!
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* Get a writable JSON object corresponding to a key in the configuration.
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*
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* The JSON object's value can be used directly if it can be implictly type-cast, and it can be assigned a new value. See
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* https://nlohmann.github.io/json/api/basic_json/ for further information on how to read and write the JSON object.
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*
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* @param key Top level key corresponding to a section of the SPACEBOX configuration JSON
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* @return
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*/
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nlohmann::json& operator[](const std::string& key);
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/*!
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* Get a read-only JSON object reference to the specified keys, each given as a separate argument. If no keys are given,
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* a reference to the entire configuration JSON object is returned.
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*
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* @return read-only JSON object reference
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*/
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const nlohmann::json& operator[](const std::string& key) const;
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/*!
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* @return Read-only JSON object reference to the full configuration
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*/
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const nlohmann::json& operator()() const;
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/*!
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* Get a read-only reference to the value at the given hierarchy of keys. If no type is specified for the return type, a
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* JSON object will be returned.
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*
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* Example,
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*
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* std::cout << _configuration() << std::endl;
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* std::cout << _configuration("recording", "enabled") << " " << _configuration("input") << " " << _configuration("levels", 0, 3, 1) << std::endl;
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*
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* Prints,
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*
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* [full config...]
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* true {"any-key-ignore-commands":[],"default-unsuppress-delay":0.7,"ignore-repeat-keypress":true,"suppress-any-key-on-mods":true, \
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* "system-any-key-ignore-commands":["fullscreen","screenshot","record","quit"]} 261.0
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*
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* @param keys hierarchy of keys used to look up a specific value in the config JSON
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* @return read-only reference to value specified by keys
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*/
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template<typename... Key>
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const nlohmann::json& operator()(const Key&... keys) const
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{
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return access(config, keys...);
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}
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/*!
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* Merge new SPACEBOX configuration JSON with the JSON already in memory, overwriting any existing key/value pairs.
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*
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* @param incoming JSON object populated with SPACEBOX configuration settings
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*/
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void merge(const nlohmann::json& incoming);
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/*!
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* Merge new SPACEBOX configuration from a given path to a JSON file.
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*
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* @param path JSON file path with new configuration values
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*/
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void merge(const fs::path& path);
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/*!
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* @overload void Configuration::merge(fs::path path)
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*/
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void merge(const std::string& path);
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/*!
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* @overload void Configuration::merge(fs::path path)
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*/
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void merge(const char* path);
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/*!
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* Enable auto refresh. Auto refresh watches the file at the given path for changes and loads them automatically every interval given
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* in seconds.
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*
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* @param file_to_refresh path to a configuration JSON
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* @param interval amount of seconds between each refresh
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*/
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void enable_auto_refresh(const fs::path& file_to_refresh, float interval);
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/*!
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* Disable auto refresh. The file previously set with Configuration::enable_auto_refresh will no longer be watched for changes.
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*/
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void disable_auto_refresh();
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/*!
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* Check if the user config file was modified and merge if so.
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*/
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void refresh();
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/*!
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* Update the auto refresher with the given timestamp, which should be the timestamp passed to Game::update.
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*
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* @param timestamp seconds elapsed since the program started
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*/
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void update(float timestamp);
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};
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/* Extend GLM so nlohmann::json can read and write glm::vec2 */
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namespace glm
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{
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template <typename T>
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void to_json(nlohmann::json& j, const vec<2, T, defaultp>& v)
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{
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j = nlohmann::json{v.x, v.y};
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}
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template <typename T>
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void from_json(const nlohmann::json& j, vec<2, T, defaultp>& v)
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{
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j.at(0).get_to(v.x);
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j.at(1).get_to(v.y);
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}
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}
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/* Extend std::filesystem so nlohmann::json can read and write std::filesystem::path */
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#if defined(__MINGW32__)
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namespace std::experimental::filesystem
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#else
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namespace std::filesystem
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#endif
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{
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template <typename T>
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void to_json(nlohmann::json& j, const path& p)
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{
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j = nlohmann::json{p};
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}
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template <typename T>
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void from_json(const nlohmann::json& j, path& p)
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{
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j.at(0).get_to(p);
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}
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}
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namespace std
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{
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/*!
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* Stream the entire JSON when the stream operator is called.
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*
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* @param out Output stream
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* @param configuration Configuration object being output to the stream
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* @return A reference to the input stream
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*/
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std::ostream& operator<<(std::ostream& out, const Configuration& configuration);
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}
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/* Add Configuration class to the sb namespace. This should be the default location, but Configuration is left in the global namespace
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* for backward compatibility. */
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namespace sb
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{
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using ::Configuration;
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}
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