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192 lines
4.9 KiB
C++
192 lines
4.9 KiB
C++
/*
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* CConfigHandler.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "CConfigHandler.h"
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#include "../lib/filesystem/Filesystem.h"
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#include "../lib/GameConstants.h"
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#include "../lib/VCMIDirs.h"
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VCMI_LIB_NAMESPACE_BEGIN
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SettingsStorage settings;
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SettingsStorage persistentStorage;
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template<typename Accessor>
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SettingsStorage::NodeAccessor<Accessor>::NodeAccessor(SettingsStorage & _parent, std::vector<std::string> _path):
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parent(_parent),
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path(std::move(_path))
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{
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}
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template<typename Accessor>
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SettingsStorage::NodeAccessor<Accessor> SettingsStorage::NodeAccessor<Accessor>::operator[](const std::string & nextNode) const
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{
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std::vector<std::string> newPath = path;
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newPath.push_back(nextNode);
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return NodeAccessor(parent, newPath);
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}
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template<typename Accessor>
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SettingsStorage::NodeAccessor<Accessor>::operator Accessor() const
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{
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return Accessor(parent, path);
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}
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template<typename Accessor>
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SettingsStorage::NodeAccessor<Accessor> SettingsStorage::NodeAccessor<Accessor>::operator () (std::vector<std::string> _path) const
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{
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std::vector<std::string> newPath = path;
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newPath.insert( newPath.end(), _path.begin(), _path.end());
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return NodeAccessor(parent, newPath);
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}
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SettingsStorage::SettingsStorage():
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write(NodeAccessor<Settings>(*this, std::vector<std::string>() )),
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listen(NodeAccessor<SettingsListener>(*this, std::vector<std::string>() ))
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{
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}
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void SettingsStorage::init(const std::string & dataFilename, const std::string & schema)
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{
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this->dataFilename = dataFilename;
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this->schema = schema;
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JsonPath confName = JsonPath::builtin(dataFilename);
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JsonUtils::assembleFromFiles(confName.getOriginalName()).swap(config);
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// Probably new install. Create config file to save settings to
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if (!CResourceHandler::get("local")->existsResource(confName))
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CResourceHandler::get("local")->createResource(dataFilename);
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if(!schema.empty())
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{
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JsonUtils::maximize(config, schema);
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JsonUtils::validate(config, schema, "settings");
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}
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}
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void SettingsStorage::invalidateNode(const std::vector<std::string> &changedPath)
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{
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for(SettingsListener * listener : listeners)
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listener->nodeInvalidated(changedPath);
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JsonNode savedConf = config;
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savedConf.Struct().erase("session");
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if(!schema.empty())
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JsonUtils::minimize(savedConf, schema);
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std::fstream file(CResourceHandler::get()->getResourceName(JsonPath::builtin(dataFilename))->c_str(), std::ofstream::out | std::ofstream::trunc);
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file << savedConf.toJson();
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}
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JsonNode & SettingsStorage::getNode(const std::vector<std::string> & path)
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{
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JsonNode *node = &config;
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for(const std::string & value : path)
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node = &(*node)[value];
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return *node;
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}
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Settings SettingsStorage::get(const std::vector<std::string> & path)
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{
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return Settings(*this, path);
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}
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const JsonNode & SettingsStorage::operator[](const std::string & value) const
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{
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return config[value];
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}
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const JsonNode & SettingsStorage::toJsonNode() const
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{
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return config;
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}
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SettingsListener::SettingsListener(SettingsStorage & _parent, std::vector<std::string> _path):
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parent(_parent),
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path(std::move(_path))
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{
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parent.listeners.insert(this);
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}
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SettingsListener::SettingsListener(const SettingsListener &sl):
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parent(sl.parent),
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path(sl.path),
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callback(sl.callback)
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{
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parent.listeners.insert(this);
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}
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SettingsListener::~SettingsListener()
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{
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parent.listeners.erase(this);
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}
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void SettingsListener::nodeInvalidated(const std::vector<std::string> &changedPath)
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{
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if (!callback)
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return;
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size_t min = std::min(path.size(), changedPath.size());
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size_t mismatch = std::mismatch(path.begin(), path.begin()+min, changedPath.begin()).first - path.begin();
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if (min == mismatch)
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callback(parent.getNode(path));
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}
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void SettingsListener::operator() (std::function<void(const JsonNode&)> _callback)
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{
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callback = std::move(_callback);
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}
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Settings::Settings(SettingsStorage &_parent, const std::vector<std::string> &_path):
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parent(_parent),
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path(_path),
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node(_parent.getNode(_path)),
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copy(_parent.getNode(_path))
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{
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}
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Settings::~Settings()
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{
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if (node != copy)
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parent.invalidateNode(path);
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}
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JsonNode* Settings::operator -> ()
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{
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return &node;
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}
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const JsonNode* Settings::operator ->() const
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{
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return &node;
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}
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const JsonNode & Settings::operator[](const std::string & value) const
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{
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return node[value];
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}
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JsonNode & Settings::operator[](const std::string & value)
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{
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return node[value];
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}
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// Force instantiation of the SettingsStorage::NodeAccessor class template.
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// That way method definitions can sit in the cpp file
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template struct SettingsStorage::NodeAccessor<SettingsListener>;
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template struct SettingsStorage::NodeAccessor<Settings>;
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VCMI_LIB_NAMESPACE_END
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