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252 lines (193 loc) · 8.18 KB
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# -*- coding: utf-8 -*-
import ast
import numbers
from bpython.simpleeval import (simple_eval,
evaluate_current_expression,
EvaluationError,
safe_get_attribute,
safe_get_attribute_new_style)
from bpython.test import unittest
from bpython._py3compat import py3
class TestSimpleEval(unittest.TestCase):
def assertMatchesStdlib(self, expr):
self.assertEqual(ast.literal_eval(expr), simple_eval(expr))
def test_matches_stdlib(self):
"""Should match the stdlib literal_eval if no names or indexing"""
self.assertMatchesStdlib("[1]")
self.assertMatchesStdlib("{(1,): [2,3,{}]}")
def test_indexing(self):
"""Literals can be indexed into"""
self.assertEqual(simple_eval('[1,2][0]'), 1)
self.assertEqual(simple_eval('a', {'a': 1}), 1)
def test_name_lookup(self):
"""Names can be lookup up in a namespace"""
self.assertEqual(simple_eval('a', {'a': 1}), 1)
self.assertEqual(simple_eval('map'), map)
self.assertEqual(simple_eval('a[b]', {'a': {'c': 1}, 'b': 'c'}), 1)
def test_allow_name_lookup(self):
"""Names can be lookup up in a namespace"""
self.assertEqual(simple_eval('a', {'a': 1}), 1)
def test_lookup_on_suspicious_types(self):
class FakeDict(object):
pass
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': FakeDict()})
class TrickyDict(dict):
def __getitem__(self, index):
self.fail("doing key lookup isn't safe")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': TrickyDict()})
class SchrodingersDict(dict):
def __getattribute__(inner_self, attr):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': SchrodingersDict()})
class SchrodingersCatsDict(dict):
def __getattr__(inner_self, attr):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a[1]', {'a': SchrodingersDict()})
def test_operators_on_suspicious_types(self):
class Spam(numbers.Number):
def __add__(inner_self, other):
self.fail("doing attribute lookup might have side effects")
with self.assertRaises(ValueError):
simple_eval('a + 1', {'a': Spam()})
def test_operators_on_numbers(self):
self.assertEqual(simple_eval('-2'), -2)
self.assertEqual(simple_eval('1 + 1'), 2)
self.assertEqual(simple_eval('a - 2', {'a': 1}), -1)
with self.assertRaises(ValueError):
simple_eval('2 * 3')
with self.assertRaises(ValueError):
simple_eval('2 ** 3')
def test_function_calls_raise(self):
with self.assertRaises(ValueError):
simple_eval('1()')
def test_nonexistant_names_raise(self):
with self.assertRaises(EvaluationError):
simple_eval('a')
def test_attribute_access(self):
class Foo(object):
abc = 1
self.assertEqual(simple_eval('foo.abc', {'foo': Foo()}), 1)
class TestEvaluateCurrentExpression(unittest.TestCase):
def assertEvaled(self, line, value, ns=None):
assert line.count('|') == 1
cursor_offset = line.find('|')
line = line.replace('|', '')
self.assertEqual(evaluate_current_expression(cursor_offset, line, ns),
value)
def assertCannotEval(self, line, ns=None):
assert line.count('|') == 1
cursor_offset = line.find('|')
line = line.replace('|', '')
with self.assertRaises(EvaluationError):
evaluate_current_expression(cursor_offset, line, ns)
def test_simple(self):
self.assertEvaled('[1].a|bc', [1])
self.assertEvaled('[1].abc|', [1])
self.assertEvaled('[1].|abc', [1])
self.assertEvaled('[1]. |abc', [1])
self.assertEvaled('[1] .|abc', [1])
self.assertCannotEval('[1].abc |', [1])
self.assertCannotEval('[1]. abc |', [1])
self.assertCannotEval('[2][1].a|bc', [1])
def test_nonsense(self):
self.assertEvaled('!@#$ [1].a|bc', [1])
self.assertEvaled('--- [2][0].a|bc', 2)
self.assertCannotEval('"asdf".centered()[1].a|bc')
self.assertEvaled('"asdf"[1].a|bc', 's')
def test_with_namespace(self):
self.assertEvaled('a[1].a|bc', 'd', {'a': 'adsf'})
self.assertCannotEval('a[1].a|bc', {})
class A(object):
a = 'a'
class B(A):
b = 'b'
class Property(object):
@property
def prop(self):
raise AssertionError('Property __get__ executed')
class Slots(object):
__slots__ = ['s1', 's2', 's3']
if not py3:
@property
def s3(self):
raise AssertionError('Property __get__ executed')
class SlotsSubclass(Slots):
@property
def s4(self):
raise AssertionError('Property __get__ executed')
class OverriddenGetattr(object):
def __getattr__(self, attr):
raise AssertionError('custom __getattr__ executed')
a = 1
class OverriddenGetattribute(object):
def __getattribute__(self, attr):
raise AssertionError('custom __getattribute__ executed')
a = 1
class OverriddenMRO(object):
def __mro__(self):
raise AssertionError('custom mro executed')
a = 1
member_descriptor = type(Slots.s1)
class TestSafeGetAttribute(unittest.TestCase):
def test_lookup_on_object(self):
a = A()
a.x = 1
self.assertEqual(safe_get_attribute_new_style(a, 'x'), 1)
self.assertEqual(safe_get_attribute_new_style(a, 'a'), 'a')
b = B()
b.y = 2
self.assertEqual(safe_get_attribute_new_style(b, 'y'), 2)
self.assertEqual(safe_get_attribute_new_style(b, 'a'), 'a')
self.assertEqual(safe_get_attribute_new_style(b, 'b'), 'b')
def test_avoid_running_properties(self):
p = Property()
self.assertEqual(safe_get_attribute_new_style(p, 'prop'),
Property.prop)
@unittest.skipIf(py3, 'Old-style classes not in Python 3')
def test_raises_on_old_style_class(self):
class Old:
pass
with self.assertRaises(ValueError):
safe_get_attribute_new_style(Old, 'asdf')
def test_lookup_with_slots(self):
s = Slots()
s.s1 = 's1'
self.assertEqual(safe_get_attribute(s, 's1'), 's1')
self.assertIsInstance(safe_get_attribute_new_style(s, 's1'),
member_descriptor)
with self.assertRaises(AttributeError):
safe_get_attribute(s, 's2')
self.assertIsInstance(safe_get_attribute_new_style(s, 's2'),
member_descriptor)
def test_lookup_on_slots_classes(self):
sga = safe_get_attribute
s = SlotsSubclass()
self.assertIsInstance(sga(Slots, 's1'), member_descriptor)
self.assertIsInstance(sga(SlotsSubclass, 's1'), member_descriptor)
self.assertIsInstance(sga(SlotsSubclass, 's4'), property)
self.assertIsInstance(sga(s, 's4'), property)
@unittest.skipIf(py3, "Py 3 doesn't allow slots and prop in same class")
def test_lookup_with_property_and_slots(self):
sga = safe_get_attribute
s = SlotsSubclass()
self.assertIsInstance(sga(Slots, 's3'), property)
self.assertEqual(safe_get_attribute(s, 's3'),
Slots.__dict__['s3'])
self.assertIsInstance(sga(SlotsSubclass, 's3'), property)
def test_lookup_on_overridden_methods(self):
sga = safe_get_attribute
self.assertEqual(sga(OverriddenGetattr(), 'a'), 1)
self.assertEqual(sga(OverriddenGetattribute(), 'a'), 1)
self.assertEqual(sga(OverriddenMRO(), 'a'), 1)
with self.assertRaises(AttributeError):
sga(OverriddenGetattr(), 'b')
with self.assertRaises(AttributeError):
sga(OverriddenGetattribute(), 'b')
with self.assertRaises(AttributeError):
sga(OverriddenMRO(), 'b')
if __name__ == '__main__':
unittest.main()