From 0b749558b9d47ecff38b3d323c7942956a084b4c Mon Sep 17 00:00:00 2001
From: Alexander Bruy <alexander.bruy@gmail.com>
Date: Sun, 5 Jan 2020 13:34:55 +0200
Subject: [PATCH] [processing] add proper support for range parameters (fix
 #29269)

---
 python/plugins/processing/algs/grass7/Grass7Algorithm.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/python/plugins/processing/algs/grass7/Grass7Algorithm.py b/python/plugins/processing/algs/grass7/Grass7Algorithm.py
index f7a9e712700d..fcb06099a051 100644
--- a/python/plugins/processing/algs/grass7/Grass7Algorithm.py
+++ b/python/plugins/processing/algs/grass7/Grass7Algorithm.py
@@ -25,6 +25,7 @@
 import os
 import re
 import uuid
+import math
 import importlib
 
 from qgis.PyQt.QtCore import QCoreApplication, QUrl
@@ -48,6 +49,7 @@
                        QgsProcessingParameterField,
                        QgsProcessingParameterPoint,
                        QgsProcessingParameterBoolean,
+                       QgsProcessingParameterRange,
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterVectorLayer,
                        QgsProcessingParameterRasterLayer,
@@ -617,6 +619,12 @@ def processCommand(self, parameters, context, feedback, delOutputs=False):
             elif isinstance(param, (QgsProcessingParameterNumber,
                                     QgsProcessingParameterPoint)):
                 value = self.parameterAsString(parameters, paramName, context)
+            elif isinstance(param, QgsProcessingParameterRange):
+                v = self.parameterAsRange(parameters, paramName, context)
+                if (param.flags() & QgsProcessingParameterDefinition.FlagOptional) and (math.isnan(v[0]) or math.isnan(v[1])):
+                    continue
+                else:
+                    value = '{},{}'.format(v[0], v[1])
             # For everything else, we assume that it is a string
             else:
                 value = '"{}"'.format(