GRASS: add ext module for v.reclass

In order to check that either 'rules' or 'column' parameter is set

python/plugins/grassprovider/ext/v_reclass.py

@@ -0,0 +1,31 @@
+"""
+***************************************************************************
+    v_reclass.py
+    ----------
+    Date                 : June 2023
+    Copyright            : (C) 2023 by Andrea Giudiceandrea
+    Email                : andreaerdna at libero dot it
+***************************************************************************
+*                                                                         *
+*   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     *
+*   any later version.                                                    *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Andrea Giudiceandrea'
+__date__ = 'June 2023'
+__copyright__ = '(C) 2023, Andrea Giudiceandrea'
+
+
+def checkParameterValuesBeforeExecuting(alg, parameters, context):
+    """ Verify if we have the right parameters """
+    # rules and column parameters are mutually exclusive
+    rules = alg.parameterAsString(parameters, 'rules', context)
+    column = alg.parameterAsString(parameters, 'column', context)
+    if (rules and column) or (not rules and not column):
+        return False, alg.tr("You need to set either a rules file or a column!")
+
+    return True, None