def observer(old_value, new_value):
new_expression_value = expression.expression(container)
run = True
if on_xml.get("value") is not None:
run = run and (parse_logic_expression(on_xml.get("value")).expression(container) == new_expression_value)
if on_xml.get("old_value") is not None and "value" in context:
run = run and (parse_logic_expression(on_xml.get("old_value")).expression(container) == context["value"])
context["value"] = new_expression_value
if run:
eval_procedure(container, on_xml.getchildren(), expression_value=new_expression_value)
def handle_signal(container, on_xml, **kwargs):
for k, v in kwargs.iteritems():
if on_xml.get(k):
w = parse_logic_expression(on_xml.get(k)).expression(container)
if w != v:
logger.debug("Skipping %s because %s value %r != %r", etree.tostring(on_xml).strip(), k, w, v)
return
eval_procedure(container, on_xml.getchildren())
def setup_ons(config, container):
for on_xml in config.xpath("/smarthome/on"):
if on_xml.get("signal"):
object, signal = on_xml.get("signal").split(".", 1)
container.object_manager.connect_object_signal(object, signal,
functools.partial(handle_signal, container, on_xml))
elif on_xml.get("expression") or on_xml.get("property"):
expression = parse_logic_expression(on_xml.get("expression") or on_xml.get("property"))
observer = create_expression_change_observer(container, on_xml, expression, {})
for property_pointer in expression.properties_involved:
container.object_manager.add_object_property_change_observer(property_pointer.object_pointer.name,
property_pointer.name,
observer)
else:
raise ValueError("<on/> should specify signal or property to bind")
def logic_expression(s):
return parse_logic_expression(s)
def eval_procedure(container, procedure, **kwargs):
had_if = False
eval_next_else = False
for command in procedure:
logger.debug("Evaluating %s", etree.tostring(command).strip())
if command.tag == "else":
if not had_if:
raise ValueError("Else witout preceding if")
if eval_next_else:
eval_procedure(container, command.getchildren(), **kwargs)
else:
logger.debug("Skipping this else because if condition was True")
continue
had_if = False
eval_next_else = False
if command.tag == "if":
had_if = True
condition = parse_logic_expression(command.get("condition")).expression(container, **kwargs)
logger.debug("Condition value: %r", condition)
if condition:
eval_procedure(container, command.getchildren(), **kwargs)
else:
eval_next_else = True
elif command.tag == "call":
if command.get("method"):
object, method = command.get("method").split(".")
meth = getattr(container.object_manager.objects[object], method)
result = meth(**{k: parse_logic_expression(v).expression(container, **kwargs)
for k, v in command.attrib.iteritems()
if k not in ("method",)})
if command.getchildren():
if not isinstance(result, Promise):
raise ValueError("Command has children but did not returned a Promise")
for child in command.getchildren():
getattr(result, "on_%s" % child.tag)(functools.partial(eval_procedure, container,
child.getchildren(), **kwargs))
elif command.get("routine"):
container.routine_manager.call_routine(command.get("routine"))
elif command.tag == "set":
object, property = command.get("property").split(".")
expression = parse_logic_expression(command.get("value"))
container.object_manager.objects[object].set_property(property,
expression.expression(container, **kwargs))
elif command.tag == "async":
container.worker_pool.run_task(functools.partial(eval_procedure, container, command.getchildren(), **kwargs))
elif command.tag == "wait":
if command.get("seconds"):
time.sleep(int(command.get("seconds")))
elif command.tag == "connect_pad":
dst_object = container.object_manager.objects[command.get("dst_object")]
dst_object.connect_to_pad(command.get("dst_pad"), command.get("src_object"), command.get("src_pad"))
elif command.tag == "disconnect_pad":
dst_object = container.object_manager.objects[command.get("dst_object")]
dst_object.disconnect_from_pad(command.get("dst_pad"), command.get("src_object"), command.get("src_pad"))
elif command.tag == "toggle_pad_connection":
dst_object = container.object_manager.objects[command.get("dst_object")]
dst_pad = command.get("dst_pad")
if len(dst_object.dump_incoming_pad_connections().get(dst_pad, [])) == 0:
dst_object.connect_to_pad(dst_pad, command.get("src_object"), command.get("src_pad"))
else:
dst_object.disconnect_all_from_pad(dst_pad)
elif command.tag == "disconnect_all_from_pad":
dst_object = container.object_manager.objects[command.get("dst_object")]
dst_object.disconnect_all_from_pad(command.get("dst_pad"))
else:
raise ValueError("Unknown command: %s" % command.tag)