style: add name translation to latent styles

Use BabelFish to translate between UI and internal style names when
necessary.

Author: Steve Canny

docx/styles/latent.py

@@ -8,6 +8,7 @@
     absolute_import, division, print_function, unicode_literals
 )
 
+from . import BabelFish
 from ..shared import ElementProxy
 
 
@@ -24,7 +25,8 @@ def __getitem__(self, key):
         """
         Enables dictionary-style access to a latent style by name.
         """
-        lsdException = self._element.get_by_name(key)
+        style_name = BabelFish.ui2internal(key)
+        lsdException = self._element.get_by_name(style_name)
         if lsdException is None:
             raise KeyError("no latent style with name '%s'" % key)
         return _LatentStyle(lsdException)
@@ -42,7 +44,7 @@ def add_latent_style(self, name):
         having *name*.
         """
         lsdException = self._element.add_lsdException()
-        lsdException.name = name
+        lsdException.name = BabelFish.ui2internal(name)
         return _LatentStyle(lsdException)
 
     @property
@@ -179,7 +181,7 @@ def name(self):
         """
         The name of the built-in style this exception applies to.
         """
-        return self._element.name
+        return BabelFish.internal2ui(self._element.name)
 
     @property
     def priority(self):

tests/styles/test_latent.py

@@ -56,7 +56,7 @@ def delete_fixture(self):
         return latent_style, latent_styles, expected_xml
 
     @pytest.fixture(params=[
-        ('w:lsdException{w:name=Foobar}', 'Foobar'),
+        ('w:lsdException{w:name=heading 1}', 'Heading 1'),
     ])
     def name_get_fixture(self, request):
         lsdException_cxml, expected_value = request.param
@@ -194,8 +194,8 @@ def it_can_change_its_boolean_properties(self, bool_prop_set_fixture):
     @pytest.fixture
     def add_fixture(self):
         latent_styles = LatentStyles(element('w:latentStyles'))
-        name = 'Foobar'
-        expected_xml = xml('w:latentStyles/w:lsdException{w:name=Foobar}')
+        name = 'Heading 1'
+        expected_xml = xml('w:latentStyles/w:lsdException{w:name=heading 1}')
         return latent_styles, name, expected_xml
 
     @pytest.fixture(params=[
@@ -261,6 +261,7 @@ def count_set_fixture(self, request):
         ('w:lsdException{w:name=Ab},w:lsdException,w:lsdException', 'Ab', 0),
         ('w:lsdException,w:lsdException{w:name=Cd},w:lsdException', 'Cd', 1),
         ('w:lsdException,w:lsdException,w:lsdException{w:name=Ef}', 'Ef', 2),
+        ('w:lsdException{w:name=heading 1}', 'Heading 1', 0),
     ])
     def getitem_fixture(self, request):
         cxml, name, idx = request.param