[Bugfix][Processing] Py and R scripts parsing file param

Need to be cherry-picked

python/plugins/processing/algs/r/RAlgorithm.py

@@ -241,9 +241,12 @@ def processInputParameterToken(self, token, name):
                 param = ParameterTableField(name, desc, field)
         elif token.lower().strip() == 'extent':
             param = ParameterExtent(name, desc)
-        elif token.lower().strip() == 'file':
+        elif token.lower().strip().startswith('file'):
             param = ParameterFile(name, desc, False)
-        elif token.lower().strip() == 'folder':
+            ext = token.strip()[len('file') + 1:]
+            if ext:
+                param.ext = ext
+        elif token.lower().strip().startswith('folder'):
             param = ParameterFile(name, desc, True)
         elif token.lower().strip().startswith('string'):
             default = token.strip()[len('string') + 1:]
@@ -257,7 +260,7 @@ def processInputParameterToken(self, token, name):
                 param = ParameterString(name, desc, default, multiline=True)
             else:
                 param = ParameterString(name, desc, multiline=True)
-        elif token.lower().strip() == 'crs':
+        elif token.lower().strip().startswith('crs'):
             default = token.strip()[len('crs') + 1:]
             if default:
                 param = ParameterCrs(name, desc, default)

python/plugins/processing/script/ScriptAlgorithm.py

@@ -225,9 +225,12 @@ def processInputParameterToken(self, token, name):
                 param = ParameterBoolean(name, descName)
         elif token.lower().strip() == 'extent':
             param = ParameterExtent(name, descName)
-        elif token.lower().strip() == 'file':
+        elif token.lower().strip().startswith('file'):
             param = ParameterFile(name, descName, False)
-        elif token.lower().strip() == 'folder':
+            ext = token.strip()[len('file') + 1:]
+            if ext:
+                param.ext = ext
+        elif token.lower().strip().startswith('folder'):
             param = ParameterFile(name, descName, True)
         elif token.lower().strip().startswith('number'):
             default = token.strip()[len('number') + 1:]