SWIG: Add typemaps for std::optional<int> and std::optional<double>

common/swig/kicad.i

@@ -157,6 +157,9 @@ typedef long time_t;
 // Shapes/geometry
 %include shape.i
 
+// std::optional type mappings
+%include optional.i
+
 // ignore warning relative to operator = and operator ++:
 #pragma SWIG nowarn=362,383
 

common/swig/optional.i

@@ -0,0 +1,74 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2024 Mark Haemmerling <dev@markh.de>
+ * Copyright (C) 1992-2024 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file optional.i
+ * @brief typemaps for std::optional<int> and std::optional<double>
+ */
+
+/* Handle std::optional<int> */
+%typemap(in) (std::optional<int>) {
+    if ($input == Py_None)
+        $1 = std::nullopt;
+    else if (PyLong_Check($input))
+        $1 = std::optional<int>(PyLong_AsLong($input));
+    else
+    {
+        PyErr_SetString(PyExc_TypeError, "Need an int or None");
+        SWIG_fail;
+    }
+}
+
+%typemap(out) std::optional<int> {
+    if ($1)
+        $result = PyLong_FromLong(*$1);
+    else
+    {
+        Py_INCREF(Py_None);
+        $result = Py_None;
+    }
+}
+
+/* Handle std::optional<double> */
+%typemap(in) (std::optional<double>) {
+    if ($input == Py_None)
+        $1 = std::nullopt;
+    else if (PyFloat_Check($input))
+        $1 = std::optional<double>(PyFloat_AsDouble($input));
+    else
+    {
+        PyErr_SetString(PyExc_TypeError, "Need a float or None");
+        SWIG_fail;
+    }
+}
+
+%typemap(out) std::optional<double> {
+    if ($1)
+        $result = PyFloat_FromDouble(*$1);
+    else
+    {
+        Py_INCREF(Py_None);
+        $result = Py_None;
+    }
+}