class BitwiseExpressionTests(LeftOperatorRightExpresisonTestsBase):
ExpressionClass = ast.BitwiseExpression
false_value = 0.0
left_value = three = ast.FloatExpression(context, 3.0)
right_value = five = ast.FloatExpression(context, 5.0)
def test_ast_expression_left_operator_right_bitwise(self):
self.assertExpressionTests('bwand', equals_value=1.0)
self.assertExpressionTests('bwor', equals_value=7.0)
self.assertExpressionTests('bwxor', equals_value=6.0)
def test_ast_expression_left_operator_right_bitwise_type_errors(self):
for operation in ('bwand', 'bwor', 'bwxor'):
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.1),
ast.FloatExpression(context, 5.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.0),
ast.FloatExpression(context, 5.1))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, -3.0),
ast.FloatExpression(context, 5.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.0),
ast.FloatExpression(context, -5.0))
for left, right in itertools.product(trueish, falseish):
if isinstance(left, ast.FloatExpression) and isinstance(
right, ast.FloatExpression):
continue
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation, left, right)
class ArithmeticExpressionTests(LeftOperatorRightExpresisonTestsBase):
ExpressionClass = ast.ArithmeticExpression
false_value = 0.0
left_value = two = ast.FloatExpression(context, 2.0)
right_value = four = ast.FloatExpression(context, 4.0)
def test_ast_expression_left_operator_right_arithmetic(self):
self.assertExpressionTests('add', equals_value=6.0)
self.assertExpressionTests('sub', equals_value=-2.0)
self.assertExpressionTests('fdiv', equals_value=0.0)
self.assertExpressionTests('tdiv', equals_value=0.5)
self.assertExpressionTests('mod', equals_value=2.0)
self.assertExpressionTests('mul', equals_value=8.0)
self.assertExpressionTests('pow', equals_value=16.0)
def test_ast_expression_left_operator_right_arithmetic_type_errors(self):
for operation in ('add', 'sub', 'fdiv', 'tdiv', 'mod', 'mul', 'pow'):
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.FloatExpression(context, 2.0),
ast.StringExpression(context, '4.0'))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.StringExpression(context, '2.0'),
ast.FloatExpression(context, 4.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.FloatExpression(context, 2.0),
ast.BooleanExpression(context, True))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.BooleanExpression(context, True),
ast.FloatExpression(context, 4.0))
def test_ast_expression_getitem_error(self):
container = ast.StringExpression(context, 'Rule Engine')
member = ast.FloatExpression(context, 100.0)
with self.assertRaises(errors.LookupError):
ast.GetItemExpression(context, container, member).evaluate(None)
member = ast.FloatExpression(context, 1.1)
with self.assertRaises(errors.EvaluationError):
ast.GetItemExpression(context, container, member).evaluate(None)
def test_ast_expression_contains_error(self):
container = ast.StringExpression(context, 'Rule Engine')
member = ast.FloatExpression(context, 1.0)
with self.assertRaises(errors.EvaluationError):
ast.ContainsExpression(context, container, member).evaluate(None)
container = ast.FloatExpression(context, 1.0)
with self.assertRaises(errors.EvaluationError):
ast.ContainsExpression(context, container, member).evaluate(None)
def test_ast_expression_left_operator_right_arithmeticcomparison_numeric(
self):
neg_one = ast.FloatExpression(context, -1.0)
zero = ast.FloatExpression(context, 0.0)
one = ast.FloatExpression(context, 1.0)
values = (neg_one, zero, one)
for number in values:
self.assertExpressionTests('ge', number, zero, number is zero
or number is one)
self.assertExpressionTests('gt', number, zero, number is one)
self.assertExpressionTests('le', number, zero, number is zero
or number is neg_one)
self.assertExpressionTests('lt', number, zero, number is neg_one)
def test_ast_expression_getitem_error(self):
for container in self.containers.values():
member = ast.FloatExpression(context, 100.0)
with self.assertRaises(errors.LookupError):
ast.GetItemExpression(context, container,
member).evaluate(None)
member = ast.FloatExpression(context, 1.1)
with self.assertRaises(errors.EvaluationError):
ast.GetItemExpression(context, container,
member).evaluate(None)
member = ast.NullExpression(context)
with self.assertRaises(errors.EvaluationError):
ast.GetItemExpression(context, container, member)
def test_ast_expression_getslice_safe(self):
sym_name = ''.join(
random.choice(string.ascii_letters) for _ in range(10))
container = ast.SymbolExpression(context, sym_name)
start = ast.FloatExpression(context, 0)
stop = ast.FloatExpression(context, -1)
get_slice = ast.GetSliceExpression(context, container, start, stop)
with self.assertRaises(errors.EvaluationError):
get_slice.evaluate({sym_name: None})
get_slice = ast.GetSliceExpression(context,
container,
start,
stop,
safe=True)
self.assertIsNone(get_slice.evaluate({sym_name: None}))
def test_ast_expression_getitem_reduces(self):
container = ast.MappingExpression(context, (('one', 1), ('two', 2)))
member = ast.FloatExpression(context, 0)
with self.assertRaises(errors.LookupError):
get_item = ast.GetItemExpression(context, container, member)
get_item = ast.GetItemExpression(context, container, member, safe=True)
self.assertIsInstance(get_item.reduce(), ast.NullExpression)
def test_ast_expression_literal_float(self):
trueish_floats = (expression.value for expression in trueish
if isinstance(expression, ast.FloatExpression))
self.assertLiteralTests(ast.FloatExpression, 0.0, float('nan'),
*trueish_floats)
# converts ints to floats automatically
int_float = ast.FloatExpression(context, 1)
self.assertIsInstance(int_float.value, decimal.Decimal)
self.assertEqual(int_float.value, 1.0)
def test_ast_expression_left_operator_right_arithmetic_type_errors(self):
for operation in ('add', 'sub', 'fdiv', 'tdiv', 'mod', 'mul', 'pow'):
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.FloatExpression(context, 2.0),
ast.StringExpression(context, '4.0'))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.StringExpression(context, '2.0'),
ast.FloatExpression(context, 4.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.FloatExpression(context, 2.0),
ast.BooleanExpression(context, True))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(
operation, ast.BooleanExpression(context, True),
ast.FloatExpression(context, 4.0))
def test_ast_expression_getitem_safe(self):
sym_name = ''.join(
random.choice(string.ascii_letters) for _ in range(10))
container = ast.SymbolExpression(context, sym_name)
member = ast.FloatExpression(context, 0)
get_item = ast.GetItemExpression(context, container, member)
with self.assertRaises(errors.EvaluationError):
get_item.evaluate({sym_name: None})
get_item = ast.GetItemExpression(context, container, member, safe=True)
self.assertIsNone(get_item.evaluate({sym_name: None}))
def test_ast_expression_getitem(self):
container = self.containers[types.DataType.ARRAY]
item_0 = ast.FloatExpression(context, 0.0)
get_item = ast.GetItemExpression(context, container, item_0)
self.assertEqual(get_item.evaluate(None), 'one')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
item_n1 = ast.FloatExpression(context, -1.0)
get_item = ast.GetItemExpression(context, container, item_n1)
self.assertEqual(get_item.evaluate(None), 'two')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
container = self.containers[types.DataType.STRING]
get_item = ast.GetItemExpression(context, container, item_0)
self.assertEqual(get_item.evaluate(None), 'R')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
get_item = ast.GetItemExpression(context, container, item_n1)
self.assertEqual(get_item.evaluate(None), '!')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
def test_ast_expression_getitem(self):
container = ast.LiteralExpressionBase.from_value(context, range(5))
item_1 = ast.FloatExpression(context, 1.0)
get_item = ast.GetItemExpression(context, container, item_1)
self.assertEqual(get_item.evaluate(None), 1)
self.assertIsInstance(get_item.reduce(), ast.FloatExpression)
item_n1 = ast.FloatExpression(context, -1.0)
get_item = ast.GetItemExpression(context, container, item_n1)
self.assertEqual(get_item.evaluate(None), 4)
self.assertIsInstance(get_item.reduce(), ast.FloatExpression)
container = ast.StringExpression(context, 'Rule Engine')
get_item = ast.GetItemExpression(context, container, item_1)
self.assertEqual(get_item.evaluate(None), 'u')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
get_item = ast.GetItemExpression(context, container, item_n1)
self.assertEqual(get_item.evaluate(None), 'e')
self.assertIsInstance(get_item.reduce(), ast.StringExpression)
def test_ast_expression_contains(self):
container = ast.LiteralExpressionBase.from_value(context, range(3))
member = ast.FloatExpression(context, 1.0)
contains = ast.ContainsExpression(context, container, member)
self.assertTrue(contains.evaluate(None))
self.assertIsInstance(contains.reduce(), ast.BooleanExpression)
member = ast.FloatExpression(context, -1.0)
contains = ast.ContainsExpression(context, container, member)
self.assertFalse(contains.evaluate(None))
self.assertIsInstance(contains.reduce(), ast.BooleanExpression)
container = ast.StringExpression(context, 'Rule Engine')
member = ast.StringExpression(context, ' ')
self.assertTrue(
ast.ContainsExpression(context, container, member).evaluate(None))
member = ast.StringExpression(context, 'x')
self.assertFalse(
ast.ContainsExpression(context, container, member).evaluate(None))
def test_ast_comprehension_result_type(self):
iterable = (None, )
iterable_expression = ast.LiteralExpressionBase.from_value(
context, iterable)
comprehension = ast.ComprehensionExpression(
context, ast.NullExpression(context), 'test', iterable_expression)
self.assertEqual(comprehension.result_type,
types.DataType.ARRAY(types.DataType.NULL))
comprehension = ast.ComprehensionExpression(
context, ast.FloatExpression(context, 1), 'test',
iterable_expression)
self.assertEqual(comprehension.result_type,
types.DataType.ARRAY(types.DataType.FLOAT))
def test_ast_expression_left_operator_right_bitwise_type_errors(self):
for operation in ('bwand', 'bwor', 'bwxor', 'bwlsh', 'bwrsh'):
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.1),
ast.FloatExpression(context, 5.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.0),
ast.FloatExpression(context, 5.1))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, -3.0),
ast.FloatExpression(context, 5.0))
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation,
ast.FloatExpression(context, 3.0),
ast.FloatExpression(context, -5.0))
for left, right in itertools.product(trueish, falseish):
if isinstance(left, ast.FloatExpression) and isinstance(
right, ast.FloatExpression):
continue
with self.assertRaises(errors.EvaluationError):
self.assertExpressionTests(operation, left, right)
import unittest
import rule_engine.ast as ast
import rule_engine.engine as engine
__all__ = ('LiteralExpressionTests',)
context = engine.Context()
context.builtins = engine.Builtins.from_defaults(
{'test': {'one': 1.0, 'two': 2.0}}
)
# literal expressions which should evaluate to false
falseish = (
ast.ArrayExpression(context, tuple()),
ast.BooleanExpression(context, False),
ast.FloatExpression(context, 0.0),
ast.NullExpression(context),
ast.StringExpression(context, '')
)
# literal expressions which should evaluate to true
trueish = (
ast.ArrayExpression(context, tuple((ast.NullExpression(context),))),
ast.BooleanExpression(context, True),
ast.DatetimeExpression(context, datetime.datetime.now()),
ast.FloatExpression(context, float('-inf')),
ast.FloatExpression(context, -1.0),
ast.FloatExpression(context, 1.0),
ast.FloatExpression(context, float('inf')),
ast.StringExpression(context, 'non-empty')
)
import rule_engine.ast as ast
import rule_engine.engine as engine
__all__ = ('LiteralExpressionTests', )
context = engine.Context()
context.builtins = engine.Builtins.from_defaults(
{'test': {
'one': 1.0,
'two': 2.0
}})
# literal expressions which should evaluate to false
falseish = (ast.ArrayExpression(context, tuple()),
ast.BooleanExpression(context,
False), ast.FloatExpression(context, 0.0),
ast.NullExpression(context), ast.StringExpression(context, ''))
# literal expressions which should evaluate to true
trueish = (ast.ArrayExpression(context, tuple(
(ast.NullExpression(context), ))),
ast.ArrayExpression(context,
tuple((ast.FloatExpression(context, 1.0), ))),
ast.BooleanExpression(context, True),
ast.DatetimeExpression(context, datetime.datetime.now()),
ast.FloatExpression(context, float('-inf')),
ast.FloatExpression(context,
-1.0), ast.FloatExpression(context, 1.0),
ast.FloatExpression(context, float('inf')),
ast.StringExpression(context, 'non-empty'))
def test_ast_expression_literall_array_error(self):
with self.assertRaises(TypeError):
ast.ArrayExpression(
self.context,
tuple((ast.FloatExpression(self.context, 1.0),
ast.StringExpression(self.context, 'error'))))