fixes in datatypes

- Enum.__call__(self, value) should raise BadValueError when
  value is not hashable
- added TextType.copy (DataType.copy will not work here)

Change-Id: I6c460991fa1e6595a939fb0814f490d2188c97b4
Reviewed-on: https://forge.frm2.tum.de/review/21015
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/datatypes.py

@@ -339,7 +339,7 @@ class EnumType(DataType):
         """return the validated (internal) value or raise"""
         try:
             return self._enum[value]
-        except KeyError:
+        except (KeyError, TypeError): # TypeError will be raised when value is not hashable
             raise BadValueError(u'%r is not a member of enum %r' % (value, self._enum))
 
     def from_string(self, text):
@@ -469,6 +469,10 @@ class TextType(StringType):
     def __repr__(self):
         return u'TextType(%d, %d)' % (self.minsize, self.maxsize)
 
+    def copy(self):
+        # DataType.copy will not work, because it is exported as 'string'
+        return TextType(self.maxsize)
+
 
 # Bool is a special enum
 class BoolType(DataType):

test/test_datatypes.py

@@ -174,7 +174,7 @@ def test_EnumType():
         dt(-9)
     with pytest.raises(ValueError):
         dt(u'XX')
-    with pytest.raises(TypeError):
+    with pytest.raises(ValueError):
         dt([19, u'X'])
 
     assert dt(u'a') == 3