Implement RFC 2: Initial integration of "GDAL SRS barn" work

This work mostly consists of:
- a C++ implementation of the ISO-19111:2018 / OGC Topic 2
  "Referencing by coordinates" classes to represent Datums,
  Coordinate systems, CRSs (Coordinate Reference Systems) and
  Coordinate Operations.
- methods to convert between this C++ modeling and WKT1, WKT2
  and PROJ string representations of those objects
- management and query of a SQLite3 database of CRS and Coordinate Operation definition
- a C API binding part of those capabilities

This is all-in-one squashed commit of the work of
https://github.com/OSGeo/proj.4/pull/1040

1 files changed, 104 insertions, 0 deletions

diff --git a/include/proj/internal/coordinatesystem_internal.hpp b/include/proj/internal/coordinatesystem_internal.hpp
new file mode 100644
index 00000000..63c5f7af
--- /dev/null
+++ b/include/proj/internal/coordinatesystem_internal.hpp
@@ -0,0 +1,104 @@
+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  ISO19111:2018 implementation
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2018, Even Rouault <even dot rouault at spatialys dot com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#ifndef FROM_PROJ_CPP
+#error This file should only be included from a PROJ cpp file
+#endif
+
+#ifndef COORDINATESYSTEM_INTERNAL_HH_INCLUDED
+#define COORDINATESYSTEM_INTERNAL_HH_INCLUDED
+
+#include "proj/util.hpp"
+
+#include <map>
+#include <set>
+#include <string>
+
+//! @cond Doxygen_Suppress
+
+NS_PROJ_START
+
+namespace cs {
+
+// ---------------------------------------------------------------------------
+
+class AxisDirectionWKT1 : public util::CodeList {
+  public:
+    static const AxisDirectionWKT1 *valueOf(const std::string &nameIn);
+
+    static const AxisDirectionWKT1 NORTH;
+    static const AxisDirectionWKT1 SOUTH;
+    static const AxisDirectionWKT1 EAST;
+    static const AxisDirectionWKT1 WEST;
+    static const AxisDirectionWKT1 UP;
+    static const AxisDirectionWKT1 DOWN;
+    static const AxisDirectionWKT1 OTHER;
+
+  private:
+    explicit AxisDirectionWKT1(const std::string &nameIn);
+
+    static std::map<std::string, const AxisDirectionWKT1 *> registry;
+};
+
+// ---------------------------------------------------------------------------
+
+class AxisName {
+  public:
+    static const std::string Longitude;
+    static const std::string Latitude;
+    static const std::string Easting;
+    static const std::string Northing;
+    static const std::string Westing;
+    static const std::string Southing;
+    static const std::string Ellipsoidal_height;
+    static const std::string Geocentric_X;
+    static const std::string Geocentric_Y;
+    static const std::string Geocentric_Z;
+};
+
+// ---------------------------------------------------------------------------
+
+class AxisAbbreviation {
+  public:
+    static const std::string lon;
+    static const std::string lat;
+    static const std::string E;
+    static const std::string N;
+    static const std::string h;
+    static const std::string X;
+    static const std::string Y;
+    static const std::string Z;
+};
+
+} // namespace cs
+
+NS_PROJ_END
+
+//! @endcond
+
+#endif // COORDINATESYSTEM_INTERNAL_HH_INCLUDED