[Core] Create ElementMap and tests

Test is a dummy for now. `ElementMap.h` only contains const values.

src/App/CMakeLists.txt

@@ -278,6 +278,7 @@ SET(FreeCADApp_HPP_SRCS
     Color.h
     ColorModel.h
     ComplexGeoData.h
+    ElementMap.h
     Enumeration.h
     IndexedName.h
     MappedName.h

src/App/ElementMap.h

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/****************************************************************************
+ *   Copyright (c) 2018-2022 Zheng, Lei (realthunder)                       *
+ *   <realthunder.dev@gmail.com>                                            *
+ *   Copyright (c) 2023 FreeCAD Project Association                         *
+ *                                                                          *
+ *   This file is part of FreeCAD.                                          *
+ *                                                                          *
+ *   FreeCAD is free software: you can redistribute it and/or modify it     *
+ *   under the terms of the GNU Lesser General Public License as            *
+ *   published by the Free Software Foundation, either version 2.1 of the   *
+ *   License, or (at your option) any later version.                        *
+ *                                                                          *
+ *   FreeCAD 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       *
+ *   Lesser General Public License for more details.                        *
+ *                                                                          *
+ *   You should have received a copy of the GNU Lesser General Public       *
+ *   License along with FreeCAD. If not, see                                *
+ *   <https://www.gnu.org/licenses/>.                                       *
+ *                                                                          *
+ ***************************************************************************/
+
+#ifndef DATA_ELEMENTMAP_H
+#define DATA_ELEMENTMAP_H
+
+#include "FCGlobal.h"
+#include "IndexedName.h"
+
+namespace Data {
+
+static constexpr const char *POSTFIX_TAG = ";:H";
+static constexpr const char *POSTFIX_DECIMAL_TAG = ";:T";
+static constexpr const char *POSTFIX_EXTERNAL_TAG = ";:X";
+static constexpr const char *POSTFIX_CHILD = ";:C";
+static constexpr const char *POSTFIX_INDEX = ";:I";
+static constexpr const char *POSTFIX_UPPER = ";:U";
+static constexpr const char *POSTFIX_LOWER = ";:L";
+static constexpr const char *POSTFIX_MOD = ";:M";
+static constexpr const char *POSTFIX_GEN = ";:G";
+static constexpr const char *POSTFIX_MODGEN = ";:MG";
+static constexpr const char *POSTFIX_DUPLICATE = ";D";
+
+} // namespace data
+
+#endif // DATA_ELEMENTMAP_H

tests/src/App/CMakeLists.txt

@@ -3,7 +3,8 @@ target_sources(
         PRIVATE
             ${CMAKE_CURRENT_SOURCE_DIR}/Branding.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/Expression.cpp
-	    ${CMAKE_CURRENT_SOURCE_DIR}/IndexedName.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/ElementMap.cpp
+            ${CMAKE_CURRENT_SOURCE_DIR}/IndexedName.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/License.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/MappedName.cpp
             ${CMAKE_CURRENT_SOURCE_DIR}/Metadata.cpp

tests/src/App/ElementMap.cpp

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "gtest/gtest.h"
+
+#include "App/ElementMap.h"
+
+#include <sstream>
+
+class ElementMapTest : public ::testing::Test {
+};
+
+TEST_F(ElementMapTest, defaultConstruction)
+{
+  // Act
+
+  // Assert
+}