# -*- 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()