def evaluate(self):
r'''Evaluate division set expression lookup expression.
Returns payload expression.
'''
from experimental.tools import musicexpressiontools
expression = self.offset.evaluate()
offset = expression.payload[0]
timespan_inventory = \
self._get_timespan_delimited_single_context_set_expressions(
self.attribute)
time_relation = timespantools.offset_happens_during_timespan(
offset=offset)
candidate_set_expressions = \
timespan_inventory.get_timespans_that_satisfy_time_relation(
time_relation)
root_specification = self.root_specification
source_expression_set_expression = \
root_specification._get_first_expression_that_governs_context_name(
candidate_set_expressions, self.voice_name)
assert source_expression_set_expression is not None
expression = source_expression_set_expression.source_expression
assert isinstance(
expression, musicexpressiontools.IterablePayloadExpression)
expression = self._apply_callbacks(expression)
return expression
def evaluate(self):
r'''Evaluate rhythm set expression lookup expression.
Returns none when nonevaluable.
Returns start-positioned rhythm payload expression when evaluable.
'''
from experimental.tools import musicexpressiontools
expression = self.offset.evaluate()
if expression is None:
return
offset = expression.payload[0]
timespan_inventory = \
self._get_timespan_delimited_single_context_set_expressions(
self.attribute)
time_relation = timespantools.offset_happens_during_timespan(
offset=offset)
candidate_set_expressions = \
timespan_inventory.get_timespans_that_satisfy_time_relation(
time_relation)
source_expression_set_expression = \
self.root_specification._get_first_expression_that_governs_context_name(
candidate_set_expressions, self.voice_name)
assert source_expression_set_expression is not None
assert isinstance(
source_expression_set_expression,
musicexpressiontools.TimespanScopedSingleContextSetExpression)
expression = source_expression_set_expression.source_expression
if isinstance(expression, musicexpressiontools.RhythmMakerExpression):
expression = self._apply_callbacks(expression)
return expression
elif isinstance(
expression,
musicexpressiontools.StartPositionedRhythmPayloadExpression):
# clone to prevent callbacks from inadvertantly changing source_expression expression
expression = expression._clone()
expression = self._apply_callbacks(expression)
return expression
else:
raise TypeError(expression)
def evaluate(self):
r'''Evaluate rhythm set expression lookup expression.
Returns none when nonevaluable.
Returns start-positioned rhythm payload expression when evaluable.
'''
from experimental.tools import musicexpressiontools
expression = self.offset.evaluate()
if expression is None:
return
offset = expression.payload[0]
timespan_inventory = \
self._get_timespan_delimited_single_context_set_expressions(
self.attribute)
time_relation = timespantools.offset_happens_during_timespan(
offset=offset)
candidate_set_expressions = \
timespan_inventory.get_timespans_that_satisfy_time_relation(
time_relation)
source_expression_set_expression = \
self.root_specification._get_first_expression_that_governs_context_name(
candidate_set_expressions, self.voice_name)
assert source_expression_set_expression is not None
assert isinstance(source_expression_set_expression,
musicexpressiontools.TimespanScopedSingleContextSetExpression)
expression = source_expression_set_expression.source_expression
if isinstance(expression, musicexpressiontools.RhythmMakerExpression):
expression = self._apply_callbacks(expression)
return expression
elif isinstance(
expression,
musicexpressiontools.StartPositionedRhythmPayloadExpression):
# clone to prevent callbacks from inadvertantly changing source_expression expression
expression = expression._clone()
expression = self._apply_callbacks(expression)
return expression
else:
raise TypeError(expression)
