Qualify tag classes under union type classes

nirum-lang#68

src/Nirum/Targets/Python.hs

@@ -545,6 +545,11 @@ class $className($parentClass):
 
     def __hash__(self){ ret "int" }:
         return hash($hashTuple)
+
+
+$parentClass.$className = $className
+if hasattr($parentClass, '__qualname__'):
+    $className.__qualname__ = $parentClass.__qualname__ + '.{className}'
 |]
 compilePrimitiveType :: PrimitiveTypeIdentifier -> CodeGen Code
 compilePrimitiveType primitiveTypeIdentifier = do

test/python/primitive_test.py

@@ -174,6 +174,7 @@ def test_union():
     assert MixedName.Tag.western_name.value == 'western_name'
     assert MixedName.Tag.east_asian_name.value == 'east_asian_name'
     assert MixedName.Tag.culture_agnostic_name.value == 'culture_agnostic_name'
+    assert WesternName is MixedName.WesternName  # alias
     assert isinstance(WesternName, type)
     assert issubclass(WesternName, MixedName)
     with raises(NotImplementedError):
@@ -202,6 +203,7 @@ def test_union():
                                        last_name=u'wrong')
     assert hash(WesternName(first_name=u'foo', middle_name=u'bar',
                             last_name=u'baz'))
+    assert EastAsianName is MixedName.EastAsianName
     assert isinstance(EastAsianName, type)
     assert issubclass(EastAsianName, MixedName)
     east_asian_name = EastAsianName(family_name=u'foo', given_name=u'baz')
@@ -219,6 +221,7 @@ def test_union():
         EastAsianName(family_name=1, given_name=u'baz')
     with raises(TypeError):
         EastAsianName(family_name=u'foo', given_name=2)
+    assert CultureAgnosticName is MixedName.CultureAgnosticName
     assert isinstance(CultureAgnosticName, type)
     assert issubclass(CultureAgnosticName, MixedName)
     agnostic_name = CultureAgnosticName(fullname=u'foobar')