refactor: split formatters and matchers into separated singleton classes (#166)

* split formatter into separated singleton classes

* split data engine matchers to classes

* nodiscard attribute for formatter methods

* small refactoring in matchers

* fix codefactor warnings

* fix test building

sources/awesome-widget/plugin/formatters/awpluginformatter.h

@@ -0,0 +1,69 @@
+/***************************************************************************
+ *   This file is part of awesome-widgets                                  *
+ *                                                                         *
+ *   awesome-widgets is free software: you can redistribute it and/or      *
+ *   modify it under the terms of the GNU General Public License as        *
+ *   published by the Free Software Foundation, either version 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   awesome-widgets is distributed in the hope that it will be useful,    *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with awesome-widgets. If not, see http://www.gnu.org/licenses/  *
+ ***************************************************************************/
+
+#pragma once
+
+#include <QLocale>
+#include <QVariant>
+
+#include <memory>
+
+#include "awpluginformatsettings.h"
+
+
+class AWPluginFormaterInterface
+{
+public:
+    virtual ~AWPluginFormaterInterface() = default;
+    [[nodiscard]] virtual QString format(const QVariant &_value, const QString &_key,
+                                         const AWPluginFormatSettings &_settings) const
+        = 0;
+    virtual void load(){};
+};
+
+
+template <typename Formatter> class AWPluginFormatter : public AWPluginFormaterInterface
+{
+public:
+    static constexpr double KBinBytes = 1024.0;
+    static constexpr double MBinBytes = 1024.0 * KBinBytes;
+    static constexpr double GBinBytes = 1024.0 * MBinBytes;
+
+    AWPluginFormatter(AWPluginFormatter &) = delete;
+    void operator=(const AWPluginFormatter &) = delete;
+
+    [[nodiscard]] static Formatter *instance()
+    {
+        static auto instance = loadInstance();
+        return instance.get();
+    };
+
+    [[nodiscard]] static QLocale locale(const AWPluginFormatSettings &_settings)
+    {
+        return _settings.translate ? QLocale::system() : QLocale::c();
+    };
+
+protected:
+    AWPluginFormatter() = default;
+
+    [[nodiscard]] static std::unique_ptr<Formatter> loadInstance()
+    {
+        auto instance = std::make_unique<Formatter>();
+        instance->load();
+        return instance;
+    };
+};