def test_enabled_and_wrong_output_type(self):
with patch('lusmu.core.VERIFY_OUTPUT_TYPES', True):
with assert_raises(TypeError) as exc:
node = Node(name='node',
action=IntOutputTypeAction(),
inputs=Node.inputs(self.input))
self.input.value = '42'
node._evaluate()
self.assertEqual(
"The output value type 'str' for [node]\n"
"doesn't match the expected type 'int' for action "
'"int_action".', str(exc.exception))
def inner():
input_node = Input()
output_node = Node(action=lambda value: value,
inputs=Node.inputs(input_node))
self.assertEqual(set([output_node]), input_node._dependents)
self.assertEqual((input_node,), output_node._positional_inputs)
return weakref.ref(input_node), weakref.ref(output_node)
def test_home_automation(self):
"""A simple example in the home automation domain"""
brightness_1 = Input()
brightness_2 = Input()
brightness_sum = Node(action=lambda *args: sum(args),
inputs=Node.inputs(brightness_1, brightness_2))
def inverse(value):
"""Return the inverse of a value in the range 0..510"""
return 510 - value
brightness_inverse = Node(action=inverse,
inputs=Node.inputs(brightness_sum))
lamp_power_changes = []
def set_lamp_power(value):
"""Log changes to lamp power"""
lamp_power_changes.append(value)
_lamp_power = Node(action=set_lamp_power,
inputs=Node.inputs(brightness_inverse),
triggered=True)
update_inputs_get_triggered([(brightness_1, 20),
(brightness_2, 40)])
self.assertEqual([450], lamp_power_changes)
update_inputs_get_triggered([(brightness_1, 20),
(brightness_2, 40)])
self.assertEqual([450], lamp_power_changes)
update_inputs_get_triggered([(brightness_1, 24),
(brightness_2, 40)])
self.assertEqual([450, 446], lamp_power_changes)
def test_garbage_collection(self):
"""Interconnected nodes are garbage collected"""
input_node = Input()
output_node = Node(action=lambda value: value,
inputs=Node.inputs(input_node))
self.assertEqual(set([output_node]), input_node._dependents)
self.assertEqual((input_node,), output_node._positional_inputs)
input_ref = weakref.ref(input_node)
output_ref = weakref.ref(output_node)
del input_node
del output_node
gc.collect()
self.assertEqual(None, input_ref())
self.assertEqual(None, output_ref())
def test_garbage_collection_with_finalizer_values(self):
"""Interconnected nodes with gc-unfriendly values are gc'd"""
class Val(object):
def __del__(self):
pass
val = Val()
input_node = Input(value=val)
output_node = Node(action=lambda value: value,
inputs=Node.inputs(input_node))
self.assertEqual(set([output_node]), input_node._dependents)
self.assertEqual((input_node,), output_node._positional_inputs)
self.assertEqual(val, input_node._value)
input_ref = weakref.ref(input_node)
output_ref = weakref.ref(output_node)
del input_node
del output_node
gc.collect()
self.assertEqual(None, input_ref())
self.assertEqual(None, output_ref())
def test_enabled_and_correct_output_type(self):
with patch('lusmu.core.VERIFY_OUTPUT_TYPES', True):
node = Node(action=IntOutputTypeAction(),
inputs=Node.inputs(self.input))
self.input.value = 42
node._evaluate()
def test_disabled_and_wrong_output_type(self):
node = Node(action=IntOutputTypeAction(),
inputs=Node.inputs(self.input))
self.input.value = '42'
node._evaluate()
def test_disabled_and_correct_output_type(self):
node = Node(action=IntOutputTypeAction(),
inputs=Node.inputs(self.input))
self.input.value = 42
node._evaluate()
def test_value_property_getter(self):
"""The value of a Node can be set with the .value property"""
root = Input(value=5)
leaf = Node(action=lambda value: value, inputs=Node.inputs(root))
self.assertEqual(5, leaf.value)
dy = y - TARGET['y']
return math.sqrt(dx ** 2 + dy ** 2)
def is_close_to_target(distance):
return distance < RADIUS
def get_distance_description(is_close):
return "INSIDE" if is_close else "OUTSIDE"
mousex = Input(name='mouse x')
mousey = Input(name='mouse y')
distance = Node(
name='distance',
action=get_distance,
inputs=Node.inputs(mousex, mousey))
is_close = Node(
name='is close',
action=is_close_to_target,
inputs=Node.inputs(distance))
alert = Node(
name='alert',
action=get_distance_description,
inputs=Node.inputs(is_close))
def onclick(event):
update_inputs([(mousex, event.x),
(mousey, event.y)])
print 'distance.value == {:.1f}'.format(distance.value)
def square(x):
return x ** 2
def sum_(*args):
return sum(args)
def sqrt(square):
print "** taking square root of {:.2f}".format(square)
return math.sqrt(square)
area_a = Node(name="square of a", action=square, inputs=Node.inputs(a))
area_b = Node(name="square of b", action=square, inputs=Node.inputs(b))
area_hypothenuse = Node(name="square of hypothenuse", action=sum_, inputs=Node.inputs(area_a, area_b))
hypothenuse = Node(name="length of hypothenuse", action=sqrt, inputs=Node.inputs(area_hypothenuse))
sin_alpha = Node(name="sin of alpha", action=operator.div, inputs=Node.inputs(a, hypothenuse))
alpha = Node(name="angle alpha", action=math.asin, inputs=Node.inputs(sin_alpha))
sin_beta = Node(name="sin of beta", action=operator.div, inputs=Node.inputs(b, hypothenuse))
beta = Node(name="angle beta", action=math.asin, inputs=Node.inputs(sin_beta))
print "Enter float values for a and b, e.g.\n> 3.0 4.0"
while True:
answer = raw_input("\n> ")
if not answer:
break
value_a, value_b = answer.split()
return x - y
class Addition(Fragment):
def build_fragment(self, x, y):
return x + y
class Power(Fragment):
def build_fragment(self, x, p):
return x**p
x = Input(name='x-value')
y = Input(name='y-value')
p = Input(name='power')
difference = Difference(inputs=Node.inputs(x, y))
difference2 = Difference(inputs=Node.inputs(p, p))
addition = Addition(inputs=Node.inputs(difference, difference2))
power = Power(inputs=Node.inputs(difference, p))
update_inputs([(p, 10), (x, 5), (y, 10)])
# print power.value
print addition.value
print "changing y"
update_inputs([(y, 5)])
print addition.value
dx = x - TARGET["x"]
dy = y - TARGET["y"]
return math.sqrt(dx ** 2 + dy ** 2)
def is_close_to_target(distance):
return distance < RADIUS
def get_distance_description(is_close):
return "INSIDE" if is_close else "OUTSIDE"
mousex = Input(name="mouse x")
mousey = Input(name="mouse y")
distance = Node(name="distance", action=get_distance, inputs=Node.inputs(mousex, mousey))
is_close = Node(name="is close", action=is_close_to_target, inputs=Node.inputs(distance))
alert = Node(name="alert", action=get_distance_description, inputs=Node.inputs(is_close))
def onclick(event):
update_inputs([(mousex, event.x), (mousey, event.y)])
print "distance.value == {:.1f}".format(distance.value)
print "is_close.value == {!r}".format(is_close.value)
print "alert.value == {!r}".format(alert.value)
print
colors = {"INSIDE": "red", "OUTSIDE": "blue"}
draw_circle(colors[alert.value])
def draw_circle(color):
