def __eval__(self, context: Context):
forked = context.fork(symbols=context.symbols.fork(
opaque=False)) if self.fork_context else context
try:
if self.create_stack_frame:
return self.body.eval(forked)
else:
return self.body.child.eval(forked)
finally:
context.join(forked)
def values(self, context: Context):
condition_value = self.condition.eval(context)
while condition_value:
forked = context.fork(symbols=context.symbols.fork(opaque=False))
yield self.body.eval(forked)
context.join(forked)
condition_value = self.condition.eval(context)
def __eval__(self, context: Context, assignment: bool = False):
if self.expression is None:
return None
forked = context.fork()
value = self.expression.eval(forked)
if isinstance(value, Music):
return Music(self.get_events(context, forked, value))
else:
context.join(forked)
return value
def get_events(self, context: Context, forked: Context, value: Music):
try:
for event in value.expand(context):
yield event
finally:
context.join(forked)