def test_fixed_values(self):
return defer.DeferredList([
self.run_test(AND("fixed_arg_true", TRUE()), True),
self.run_test(AND("fixed_arg_false", TRUE()), False),
self.run_test(ELEMENT_OF("doesntexist", "fixed_arg_list"), False),
self.run_test(ELEMENT_OF("test", "fixed_arg_list"), True),
])
def test_not(self):
return defer.DeferredList([
self.run_test(NOT(FALSE()), True),
self.run_test(NOT(TRUE()), False),
self.run_test(NOT(OR(TRUE(), FALSE())), False),
self.run_test(NOT(AND(TRUE(), TRUE(), AND(TRUE(), FALSE()))),
True),
])
def test_all_bool(self):
return defer.DeferredList([
self.run_test(
AND("sync_dynamic_arg_true", "async_dynamic_arg_true",
'fixed_arg_true', NOT("sync_dynamic_arg_false"),
NOT("async_dynamic_arg_false"), NOT("fixed_arg_false"),
TRUE(), NOT(FALSE()), True), True),
self.run_test(
OR(NOT("sync_dynamic_arg_true"), NOT("async_dynamic_arg_true"),
NOT('fixed_arg_true'), "sync_dynamic_arg_false",
"async_dynamic_arg_false", "fixed_arg_false", FALSE(),
NOT(TRUE()), False), False),
])
def test_or(self):
return defer.DeferredList([
self.run_test(OR(FALSE(), TRUE(), AND(TRUE(), TRUE())), True),
self.run_test(AND(TRUE(), TRUE(), OR(TRUE(), FALSE())), True),
self.run_test(OR(FALSE(), FALSE(), FALSE(), FALSE(), TRUE()),
True),
self.run_test(OR(TRUE(), FALSE(), FALSE(), FALSE(), FALSE()), True)
])
from txevaluate import Evaluator, AND, OR, NOT, TRUE, FALSE, ELEMENT_OF
from twisted.internet import defer
# create an expression
will_survive = lambda who: (
OR(
AND(
ELEMENT_OF(who, "heart_of_gold"),
ELEMENT_OF(who, "get_ape_descendants"),
# make sure earth still exists
TRUE(),
),
# since we're in an OR clause, this will never be executed if the
# other condition is true.
NOT("meaning_of_life"),
))
def never_executed():
print "Execution may stop before this is printed"
return True
def some_database_request():
# let's pretend we were getting that from a database
return defer.succeed(["arthur", "trillian", "barkeeper"])
fixed_value_args = {"heart_of_gold": ["arthur", "ford", "zaphod", "trillian"]}
dynamic_args = {
def test_or_arg_count(self):
self.failureResultOf(self.run_test(OR(), False), ValueError)
self.failureResultOf(self.run_test(OR(TRUE()), False), ValueError)
self.run_test(OR(TRUE(), TRUE()), True)
self.run_test(OR(TRUE(), TRUE(), TRUE(), TRUE()), True)
def test_true(self):
return self.run_test(TRUE(), True)
def async_dynamic_argument_expression():
return defer.succeed(OR(FALSE(), TRUE()))
def sync_dynamic_argument_expression():
return OR(FALSE(), TRUE())
def test_not_arg_count(self):
with self.assertRaises(TypeError):
self.run_test(NOT(), False)
with self.assertRaises(TypeError):
self.run_test(NOT(TRUE(), TRUE()), False)
def test_and(self):
return defer.DeferredList([
self.run_test(AND(TRUE(), TRUE(), AND(TRUE(), TRUE())), True),
self.run_test(AND(TRUE(), TRUE(), AND(TRUE(), FALSE())), False),
self.run_test(AND(FALSE(), TRUE(), TRUE(), TRUE(), TRUE()), False),
self.run_test(AND(TRUE(), TRUE(), TRUE(), TRUE(), FALSE()), False)
])