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import sys
import unittest
try:
from StringIO import StringIO
except ImportError:
from io import StringIO # doesn't accept 'str' in Py2
from Cython.Utils import (
_CACHE_NAME_PATTERN, _build_cache_name, _find_cache_attributes,
build_hex_version, cached_method, clear_method_caches, try_finally_contextmanager,
print_version, normalise_float_repr,
)
METHOD_NAME = "cached_next"
CACHE_NAME = _build_cache_name(METHOD_NAME)
NAMES = CACHE_NAME, METHOD_NAME
class Cached(object):
@cached_method
def cached_next(self, x):
return next(x)
class TestCythonUtils(unittest.TestCase):
def test_build_hex_version(self):
self.assertEqual('0x001D00A1', build_hex_version('0.29a1'))
self.assertEqual('0x001D03C4', build_hex_version('0.29.3rc4'))
self.assertEqual('0x001D00F0', build_hex_version('0.29'))
self.assertEqual('0x040000F0', build_hex_version('4.0'))
############################## Cached Methods ##############################
def test_cache_method_name(self):
method_name = "foo"
cache_name = _build_cache_name(method_name)
match = _CACHE_NAME_PATTERN.match(cache_name)
self.assertIsNot(match, None)
self.assertEqual(match.group(1), method_name)
def test_requirements_for_Cached(self):
obj = Cached()
self.assertFalse(hasattr(obj, CACHE_NAME))
self.assertTrue(hasattr(obj, METHOD_NAME))
self.set_of_names_equal(obj, set())
def set_of_names_equal(self, obj, value):
self.assertEqual(set(_find_cache_attributes(obj)), value)
def test_find_cache_attributes(self):
obj = Cached()
method_name = "bar"
cache_name = _build_cache_name(method_name)
setattr(obj, CACHE_NAME, {})
setattr(obj, cache_name, {})
self.assertFalse(hasattr(obj, method_name))
self.set_of_names_equal(obj, {NAMES, (cache_name, method_name)})
def test_cached_method(self):
obj = Cached()
value = iter(range(3)) # iter for Py2
cache = {(value,): 0}
# cache args
self.assertEqual(obj.cached_next(value), 0)
self.set_of_names_equal(obj, {NAMES})
self.assertEqual(getattr(obj, CACHE_NAME), cache)
# use cache
self.assertEqual(obj.cached_next(value), 0)
self.set_of_names_equal(obj, {NAMES})
self.assertEqual(getattr(obj, CACHE_NAME), cache)
def test_clear_method_caches(self):
obj = Cached()
value = iter(range(3)) # iter for Py2
cache = {(value,): 1}
obj.cached_next(value) # cache args
clear_method_caches(obj)
self.set_of_names_equal(obj, set())
self.assertEqual(obj.cached_next(value), 1)
self.set_of_names_equal(obj, {NAMES})
self.assertEqual(getattr(obj, CACHE_NAME), cache)
def test_clear_method_caches_with_missing_method(self):
obj = Cached()
method_name = "bar"
cache_name = _build_cache_name(method_name)
names = cache_name, method_name
setattr(obj, cache_name, object())
self.assertFalse(hasattr(obj, method_name))
self.set_of_names_equal(obj, {names})
clear_method_caches(obj)
self.set_of_names_equal(obj, {names})
def test_try_finally_contextmanager(self):
states = []
@try_finally_contextmanager
def gen(*args, **kwargs):
states.append("enter")
yield (args, kwargs)
states.append("exit")
with gen(1, 2, 3, x=4) as call_args:
assert states == ["enter"]
self.assertEqual(call_args, ((1, 2, 3), {'x': 4}))
assert states == ["enter", "exit"]
class MyException(RuntimeError):
pass
del states[:]
with self.assertRaises(MyException):
with gen(1, 2, y=4) as call_args:
assert states == ["enter"]
self.assertEqual(call_args, ((1, 2), {'y': 4}))
raise MyException("FAIL INSIDE")
assert states == ["enter", "exit"]
del states[:]
with self.assertRaises(StopIteration):
with gen(1, 2, y=4) as call_args:
assert states == ["enter"]
self.assertEqual(call_args, ((1, 2), {'y': 4}))
raise StopIteration("STOP")
assert states == ["enter", "exit"]
def test_print_version(self):
orig_stderr = sys.stderr
orig_stdout = sys.stdout
stderr = sys.stderr = StringIO()
stdout = sys.stdout = StringIO()
try:
print_version()
finally:
sys.stdout = orig_stdout
sys.stderr = orig_stderr
stdout = stdout.getvalue()
stderr = stderr.getvalue()
from .. import __version__ as version
self.assertIn(version, stdout)
if stderr: # Depends on os.fstat(1/2).
self.assertIn(version, stderr)
def test_print_version_stdouterr(self):
orig_stderr = sys.stderr
orig_stdout = sys.stdout
stdout = sys.stdout = sys.stderr = StringIO() # same!
try:
print_version()
finally:
sys.stdout = orig_stdout
sys.stderr = orig_stderr
stdout = stdout.getvalue()
from .. import __version__ as version
self.assertIn(version, stdout)
self.assertEqual(stdout.count(version), 1)
def test_normalise_float_repr(self):
examples = [
('.0', '.0'),
('.000000', '.0'),
('.1', '.1'),
('1.', '1.'),
('1.0', '1.'),
('1.000000000000000000000', '1.'),
('00000000000000000000001.000000000000000000000', '1.'),
('12345.0025', '12345.0025'),
('1E5', '100000.'),
('.1E-5', '.000001'),
('1.1E-5', '.000011'),
('12.3E-5', '.000123'),
('.1E10', '1000000000.'),
('1.1E10', '11000000000.'),
('123.4E10', '1234000000000.'),
('123.456E0', '123.456'),
('123.456E-1', '12.3456'),
('123.456E-2', '1.23456'),
('123.456E1', '1234.56'),
('123.456E2', '12345.6'),
('2.1E80', '210000000000000000000000000000000000000000000000000000000000000000000000000000000.'),
]
for float_str, norm_str in examples:
self.assertEqual(float(float_str), float(norm_str)) # safety check for test data
result = normalise_float_repr(float_str)
self.assertEqual(float(float_str), float(result))
self.assertEqual(
result, norm_str,
"normalise_float_repr(%r) == %r != %r (%.330f)" % (float_str, result, norm_str, float(float_str))
)
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