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from __future__ import annotations
import pytest
from prompt_toolkit.filters import Always, Condition, Filter, Never, to_filter
from prompt_toolkit.filters.base import _AndList, _OrList
def test_never():
assert not Never()()
def test_always():
assert Always()()
def test_invert():
assert not (~Always())()
assert (~Never())()
c = ~Condition(lambda: False)
assert c()
def test_or():
for a in (True, False):
for b in (True, False):
c1 = Condition(lambda: a)
c2 = Condition(lambda: b)
c3 = c1 | c2
assert isinstance(c3, Filter)
assert c3() == a or b
def test_and():
for a in (True, False):
for b in (True, False):
c1 = Condition(lambda: a)
c2 = Condition(lambda: b)
c3 = c1 & c2
assert isinstance(c3, Filter)
assert c3() == (a and b)
def test_nested_and():
for a in (True, False):
for b in (True, False):
for c in (True, False):
c1 = Condition(lambda: a)
c2 = Condition(lambda: b)
c3 = Condition(lambda: c)
c4 = (c1 & c2) & c3
assert isinstance(c4, Filter)
assert c4() == (a and b and c)
def test_nested_or():
for a in (True, False):
for b in (True, False):
for c in (True, False):
c1 = Condition(lambda: a)
c2 = Condition(lambda: b)
c3 = Condition(lambda: c)
c4 = (c1 | c2) | c3
assert isinstance(c4, Filter)
assert c4() == (a or b or c)
def test_to_filter():
f1 = to_filter(True)
f2 = to_filter(False)
f3 = to_filter(Condition(lambda: True))
f4 = to_filter(Condition(lambda: False))
assert isinstance(f1, Filter)
assert isinstance(f2, Filter)
assert isinstance(f3, Filter)
assert isinstance(f4, Filter)
assert f1()
assert not f2()
assert f3()
assert not f4()
with pytest.raises(TypeError):
to_filter(4)
def test_filter_cache_regression_1():
# See: https://github.com/prompt-toolkit/python-prompt-toolkit/issues/1729
cond = Condition(lambda: True)
# The use of a `WeakValueDictionary` caused this following expression to
# fail. The problem is that the nested `(a & a)` expression gets garbage
# collected between the two statements and is removed from our cache.
x = (cond & cond) & cond
y = (cond & cond) & cond
assert x == y
def test_filter_cache_regression_2():
cond1 = Condition(lambda: True)
cond2 = Condition(lambda: True)
cond3 = Condition(lambda: True)
x = (cond1 & cond2) & cond3
y = (cond1 & cond2) & cond3
assert x == y
def test_filter_remove_duplicates():
cond1 = Condition(lambda: True)
cond2 = Condition(lambda: True)
# When a condition is appended to itself using an `&` or `|` operator, it
# should not be present twice. Having it twice in the `_AndList` or
# `_OrList` will make them more expensive to evaluate.
assert isinstance(cond1 & cond1, Condition)
assert isinstance(cond1 & cond1 & cond1, Condition)
assert isinstance(cond1 & cond1 & cond2, _AndList)
assert len((cond1 & cond1 & cond2).filters) == 2
assert isinstance(cond1 | cond1, Condition)
assert isinstance(cond1 | cond1 | cond1, Condition)
assert isinstance(cond1 | cond1 | cond2, _OrList)
assert len((cond1 | cond1 | cond2).filters) == 2
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