Big-Ugly Style Update (#278)

* Bulk replaced tabs with spaces
* Bulk removed trailing whitespace from lines
* Replaced c-style comments with c++-style comments in file banners
* Replace nested namespace definitions with single concise definitions (C++17), this keeps the indentation more manageable
* Cleanup ordering and spacing of include directives
* Bulk renaming of header file extensions from '.h' to '.hpp'.
* Update CODING-STYLE.md
* Update target_compile_features from cxx_std_11 to cxx_std_20.
* Refresh .clang-format file.  Still needs a lot of tweaking.

model/XmlLabelParser.hpp

@@ -0,0 +1,110 @@
+//  XmlLabelParser.hpp
+//
+//  Copyright (C) 2014-2016  Jaye Evins <evins@snaught.com>
+//
+//  This file is part of gLabels-qt.
+//
+//  gLabels-qt 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.
+//
+//  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef model_XmlLabelParser_hpp
+#define model_XmlLabelParser_hpp
+
+
+#include <QObject>
+#include <QDomElement>
+
+
+namespace glabels::model
+{
+
+        // Forward references
+        class Model;
+        class ModelObject;
+        class ModelBoxObject;
+        class ModelEllipseObject;
+        class ModelLineObject;
+        class ModelImageObject;
+        class ModelBarcodeObject;
+        class ModelTextObject;
+        class DataCache;
+
+
+        ///
+        /// XmlLabelParser
+        ///
+        class XmlLabelParser : public QObject
+        {
+                Q_OBJECT
+
+        public:
+                static Model* readFile( const QString& fileName );
+
+                static Model* readBuffer( const QByteArray& buffer );
+
+                static QList<ModelObject*> deserializeObjects( const QByteArray& buffer,
+                                                               const Model*      model );
+
+        private:
+                static void gunzip( const QByteArray& gzippedData,
+                                    QByteArray&       data );
+
+                static Model* parseRootNode( const QDomElement& node,
+                                             const QString&     fileName );
+
+                static QList<ModelObject*> parseObjectsNode( const QDomElement& node,
+                                                             const Model*       model,
+                                                             const DataCache&   data );
+
+                static ModelBoxObject* parseObjectBoxNode( const QDomElement& node );
+
+                static ModelEllipseObject* parseObjectEllipseNode( const QDomElement& node );
+
+                static ModelLineObject* parseObjectLineNode( const QDomElement& node );
+
+                static ModelImageObject* parseObjectImageNode( const QDomElement& node,
+                                                               const Model*       model,
+                                                               const DataCache&   data );
+
+                static ModelBarcodeObject* parseObjectBarcodeNode( const QDomElement& node );
+
+                static ModelTextObject* parseObjectTextNode( const QDomElement& node );
+
+                static QString parsePNode( const QDomElement& node );
+
+                static bool parseRotateAttr( const QDomElement& node );
+
+                static void parseMergeNode( const QDomElement& node,
+                                            Model*             model );
+
+                static void parseVariablesNode( const QDomElement& node,
+                                                Model*             model );
+
+                static void parseVariableNode( const QDomElement& node,
+                                               Model*             model );
+
+                static void parseDataNode( const QDomElement& node,
+                                           const Model*       model,
+                                           DataCache&         data );
+
+                static void parseFileNode( const QDomElement& node,
+                                           const Model*       model,
+                                           DataCache&         data );
+
+        };
+
+}
+
+
+#endif // model_XmlLabelParser_hpp