def _iterate_vertical_moments_forward_in_expr(expr):
#if not isinstance(expr, scoretools.Component):
# raise TypeError
governors = (expr, )
current_offset, stop_offsets, buffer = \
durationtools.Offset(0), [], []
_buffer_components_starting_with(expr, buffer, stop_offsets)
while buffer:
vertical_moment = selectiontools.VerticalMoment()
offset = durationtools.Offset(current_offset)
components = list(buffer)
components.sort(key=lambda x: x._get_parentage().score_index)
vertical_moment._offset = offset
vertical_moment._governors = governors
vertical_moment._components = components
yield vertical_moment
current_offset, stop_offsets = min(stop_offsets), []
_update_buffer(current_offset, buffer, stop_offsets)
def _get_vertical_moment_at(self, offset):
return selectiontools.VerticalMoment(self, offset)
def _get_vertical_moment(self, governor=None):
offset = self._get_timespan().start_offset
if governor is None:
governor = self._get_parentage().root
return selectiontools.VerticalMoment(governor, offset)
def get_vertical_moment_at(self, offset):
r'''Select vertical moment at `offset`.
'''
from abjad.tools import selectiontools
return selectiontools.VerticalMoment(self, offset)