def _process_element(self, element: ContentElement):
"""Filter ISD element style properties"""
element_styles = list(element.iter_styles())
for style_prop in element_styles:
value = element.get_style(style_prop)
default_value = self.style_property_default_values.get(style_prop)
parent = element.parent()
if parent is not None and style_prop.is_inherited:
# If the parent style property value has not been removed, it means
# the value is not set to default, and so that the child style property
# value may have been "forced" to the default value, so let's skip it.
parent_value = parent.get_style(style_prop)
if parent_value is not None and parent_value is not value:
continue
# Remove the style property if its value is default (and if it is not inherited)
if default_value is not None and value == default_value:
element.set_style(style_prop, None)
for child in element:
self._process_element(child)
def from_model(
ctx: TTMLElement.WritingContext,
model_element: model.ContentElement
) -> typing.Optional[et.Element]:
'''Returns the TTML element corresponding to the model element `model_element`.
`ctx` contains state information used in the process.
'''
if isinstance(model_element, model.Body):
imsc_class = BodyElement
elif isinstance(model_element, model.Div):
imsc_class = DivElement
elif isinstance(model_element, model.P):
imsc_class = PElement
elif isinstance(model_element, model.Span):
imsc_class = SpanElement
elif isinstance(model_element, model.Br):
imsc_class = BrElement
elif isinstance(model_element, model.Ruby):
imsc_class = RubyElement
elif isinstance(model_element, model.Rb):
imsc_class = RbElement
elif isinstance(model_element, model.Rt):
imsc_class = RtElement
elif isinstance(model_element, model.Rbc):
imsc_class = RbcElement
elif isinstance(model_element, model.Rtc):
imsc_class = RtcElement
elif isinstance(model_element, model.Region):
imsc_class = RegionElement
else:
return None
xml_element = imsc_class.make_ttml_element()
if (model_element.parent() is None and model_element.get_space() is model.WhiteSpaceHandling.PRESERVE) or \
(model_element.parent() is not None and model_element.parent().get_space() != model_element.get_space()):
imsc_attr.XMLSpaceAttribute.set(xml_element, model_element.get_space())
if imsc_class.has_region:
if model_element.get_region() is not None:
imsc_attr.RegionAttribute.set(xml_element, model_element.get_region().get_id())
if imsc_class.has_timing:
if model_element.get_begin() is not None:
imsc_attr.BeginAttribute.set(ctx.temporal_context, xml_element, model_element.get_begin())
if model_element.get_end() is not None:
imsc_attr.EndAttribute.set(ctx.temporal_context, xml_element, model_element.get_end())
if model_element.get_id() is not None:
imsc_attr.XMLIDAttribute.set(xml_element, model_element.get_id())
if imsc_class.has_styles:
ContentElement.from_model_style_properties(model_element, xml_element)
ContentElement.from_model_animation(ctx, model_element, xml_element)
if imsc_class.has_children:
last_child_element = None
for child in iter(model_element):
if isinstance(child, model.Text):
if last_child_element is None:
xml_element.text = child.get_text()
else:
last_child_element.tail = child.get_text()
child_element = ContentElement.from_model(ctx, child)
if child_element is not None:
xml_element.append(child_element)
last_child_element = child_element
return xml_element