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test_simpleeval.py
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146 lines (113 loc) · 4.87 KB
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# -*- coding: utf-8 -*-
import ast
import numbers
import sys
from bpython.simpleeval import (
simple_eval,
evaluate_current_expression,
EvaluationError,
)
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,{}]}")
@unittest.skipUnless(py3, "Only Python3 versions of ast.literal_eval evaluate set literals")
def test_matches_stdlib_py3(self):
"""Should match the stdlib literal_eval if no names or indexing"""
self.assertMatchesStdlib("{1, 2}")
@unittest.skipUnless(sys.version_info[:2] >= (3, 9), "Only Python3.9 evaluates set()")
def test_matches_stdlib_set_literal(self):
"""set() is evaluated"""
self.assertMatchesStdlib("set()")
def test_indexing(self):
"""Literals can be indexed into"""
self.assertEqual(simple_eval("[1,2][0]"), 1)
def test_name_lookup(self):
"""Names can be looked up in a namespace"""
self.assertEqual(simple_eval("a", {"a": 1}), 1)
self.assertEqual(simple_eval("map"), map)
def test_name_lookup_indexing(self):
"""Names can be looked up in a namespace"""
self.assertEqual(simple_eval("a[b]", {"a": {"c": 1}, "b": "c"}), 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(s
543B
elf, 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", {})
if __name__ == "__main__":
unittest.main()