[processing] Fix some script parameter export/import issues

python/plugins/processing/core/parameters.py

@@ -229,7 +229,9 @@ def fromScriptCode(self, line):
         isOptional, name, definition = _splitParameterOptions(line)
         if definition.startswith("boolean"):
             descName = _createDescriptiveName(name)
-            default = definition.strip()[len('boolean') + 1:]
+            default = definition.strip()[len('boolean') + 1:] or None
+            if default == 'None':
+                default = None
             if default:
                 param = ParameterBoolean(name, descName, default)
             else:
@@ -292,6 +294,8 @@ def fromScriptCode(self, line):
         if definition.startswith("crs"):
             descName = _createDescriptiveName(name)
             default = definition.strip()[len('crs') + 1:]
+            if default == 'None':
+                default = None
             if default:
                 return ParameterCrs(name, descName, default, isOptional)
             else:
@@ -574,7 +578,7 @@ def fromScriptCode(self, line):
         if definition.startswith("fixedtable"):
             descName = _createDescriptiveName(name)
             default = definition.strip()[len('fixedtable') + 1:] or None
-            return ParameterFixedTable(name, descName, default, isOptional)
+            return ParameterFixedTable(name, descName, optional=isOptional)
 
 
 class ParameterMultipleInput(ParameterDataObject):
@@ -1186,15 +1190,17 @@ def getAsScriptCode(self):
         param_type = ''
         if self.optional:
             param_type += 'optional '
-        param_type += 'string'
-        return '##' + self.name + '=' + param_type + self.default
+        param_type += 'string '
+        return '##' + self.name + '=' + param_type + str(self.default)
 
     @classmethod
     def fromScriptCode(self, line):
         isOptional, name, definition = _splitParameterOptions(line)
         descName = _createDescriptiveName(name)
         if definition.lower().strip().startswith('string'):
-            default = definition.strip()[len('string') + 1:]
+            default = definition.strip()[len('string') + 1:] or None
+            if default == 'None':
+                default = None
             if default:
                 return ParameterString(name, descName, default, optional=isOptional)
             else:
@@ -1255,15 +1261,17 @@ def getAsScriptCode(self):
         param_type = ''
         if self.optional:
             param_type += 'optional '
-        param_type += 'expression'
-        return '##' + self.name + '=' + param_type + self.default
+        param_type += 'expression '
+        return '##' + self.name + '=' + param_type + str(self.default)
 
     @classmethod
     def fromScriptCode(self, line):
         isOptional, name, definition = _splitParameterOptions(line)
         if definition.lower().strip().startswith('expression'):
             descName = _createDescriptiveName(name)
-            default = definition.strip()[len('expression') + 1:]
+            default = definition.strip()[len('expression') + 1:] or None
+            if default == 'None':
+                default = None
             if default:
                 return ParameterExpression(name, descName, default, optional=isOptional)
             else:
@@ -1413,7 +1421,7 @@ def getAsScriptCode(self):
         if self.optional:
             param_type += 'optional '
         param_type += 'field'
-        return '##' + self.name + '=' + param_type + self.parent
+        return '##' + self.name + '=' + param_type + str(self.parent)
 
     @classmethod
     def fromScriptCode(self, line):

python/plugins/processing/tests/ParametersTest.py

@@ -25,6 +25,8 @@
 
 __revision__ = '$Format:%H$'
 
+import sys
+from inspect import isclass
 from qgis.testing import start_app, unittest
 
 from processing.core.parameters import (Parameter,
@@ -66,6 +68,19 @@ def testGetValueAsCommandLineParameter(self):
         parameter.setValue(123)
         self.assertEqual(parameter.getValueAsCommandLineParameter(), '123')
 
+    def testScriptCode(self):
+        """Simple check that default constructed object export/import correctly"""
+        paramClasses = [c for c in list(sys.modules[__name__].__dict__.values())
+                        if isclass(c) and issubclass(c, Parameter) and c != Parameter]
+
+        for paramClass in paramClasses:
+            param = paramClass()
+            if hasattr(param, 'getAsScriptCode'):
+                code = param.getAsScriptCode()
+                importedParam = paramClass.fromScriptCode(code)
+                self.assertEquals(param.optional, importedParam.optional)
+                self.assertEquals(param.default, importedParam.default, param)
+
 
 class ParameterBooleanTest(unittest.TestCase):
 
@@ -619,6 +634,7 @@ def testScriptCode(self):
         result = getParameterFromString(code)
         self.assertIsInstance(result, ParameterExpression)
         self.assertTrue(result.optional)
+        self.assertEquals(result.default, parameter.default)
 
 
 class ParameterTableFieldTest(unittest.TestCase):