def test_maybe_monoid_just_append_nothing(self):
m = Just("Python")
self.assertEquals(
m.append(Nothing()),
m
)
def test_just_functor_law1(self):
# fmap id = id
x = Just(3)
self.assertEquals(
x.map(identity),
x
)
def test_just_functor_law1(self):
# fmap id = id
x = Just(3)
self.assertEqual(
x.map(identity),
x
)
def test_maybe_monoid_just_append_just(self):
m = Just("Python")
n = Just(" rocks!")
self.assertEqual(
m + n,
Just("Python rocks!")
)
def test_just_functor_map(self):
f = lambda x: x*2
x = Just(21)
self.assertEquals(
x.map(f),
Just(42)
)
def test_just_functor_map(self):
f = lambda x: x * 2
x = Just(21)
self.assertEqual(
x.map(f),
Just(42)
)
def test_maybe_monoid_just_append_just(self):
m = Just("Python")
n = Just(" rocks!")
self.assertEquals(
m.append(n),
Just("Python rocks!")
)
def test_just_functor_law2(self):
# fmap (f . g) x = fmap f (fmap g x)
def f(x):
return x + 10
def g(x):
return x * 10
x = Just(42)
self.assertEquals(x.map(compose(f, g)), x.map(g).map(f))
def test_just_functor_law2(self):
# fmap (f . g) x = fmap f (fmap g x)
def f(x):
return x+10
def g(x):
return x*10
x = Just(42)
self.assertEquals(
x.map(compose(f, g)),
x.map(g).map(f)
)
def test_maybe_monoid_just_append_nothing(self):
m = Just("Python")
self.assertEqual(
m + Nothing(),
m
)
def get_url(search_results):
rtn = []
for a in search_results.find_all('a'):
rtn.append(a['href'])
if len(rtn) == 0:
return Nothing
else:
return Just(rtn)
def _get(self, _p, _fp, _d, default):
if len(_p) == 1:
try:
if isinstance(_d, dict) is True:
return Just(_d[_p[0]])
if isinstance(_d, DP) is True:
return Just(_d.raw()[_p[0]])
else:
return Nothing()
except KeyError:
if isinstance(default, Monad) is True:
return default
else:
return Just(default)
d = _d.get(_p[0], None)
if _d.get(_p[0], None) is None:
_fp.append(_p[0])
d = self._mkdir(_d, _p[0], _fp)
return self._get(_p[1:], _fp, d, default)
def get_result(name_version):
theurl = "http://gpo.zugaina.org/Search?search=%s" % name_version
thepage = urllib.request.urlopen(theurl)
soup = BeautifulSoup(thepage, "lxml")
# <div id="search_results">
search_results = soup.find('div', id="search_results")
if search_results:
return Just(search_results)
else:
return Nothing
def _set(self, _p, _fp, _d, value):
if len(_p) == 1:
if isinstance(value, Monad) is True:
_d[_p[0]] = value.value
return value
else:
#print("GGG",_p[0], type(_d), _d,value)
_d[_p[0]] = value
return Just(value)
d = _d.get(_p[0], None)
if _d.get(_p[0], None) is None:
_fp.append(_p[0])
d = self._mkdir(_d, _p[0], _fp)
return self._set(_p[1:], _fp, d, value)
def test_maybe_monoid_concat(self):
self.assertEqual(
Maybe.concat([Just(2), Just(40)]),
Just(42)
)
def test_combine_just_and_just_rule1(self):
self.assertEquals(Just(5) and Just(6), Just(6))
def test_just_applicative_1(self):
a = Just.pure(lambda x, y: x + y).apply(Just(2)).apply(Just(40))
self.assertNotEquals(a, Nothing())
self.assertEquals(a, Just(42))
def test_maybe_monoid_nothing_append_just(self):
m = Just("Python")
self.assertEquals(Nothing().append(m), m)
def test_just_applicative_3(self):
a = Just.pure(lambda x, y: x+y).apply(Just(42)).apply(Nothing())
self.assertEquals(a, Nothing())
def test_just_applicative_3(self):
a = Just.pure(lambda x, y: x+y).apply(Just(42)).apply(Nothing())
self.assertEqual(a, Nothing())
def test_combine_just_or_nothing_rule2(self):
self.assertEqual(
Just(0) or Nothing,
Nothing
)
def get_category(url_list):
if len(url_list) == 1:
return Just(url_list[0])
else:
return Nothing
def test_combine_just_and_just_rule2(self):
self.assertEqual(
Just(0) and Just(6),
Just(0)
)
from oslash.maybe import Just, Nothing
Value = Just
NONE = Nothing()
TRUE = Just(True)
FALSE = Just(False)
def isNothing(x):
return x is None or x == NONE or isinstance(x, Nothing)
def test_combine_just_or_nothing_rule1(self):
self.assertEqual(
Just(5) or Nothing,
Just(5)
)