"""Test `nth` child selectors."""
from __future__ import unicode_literals
from .. import util
import soupsieve as sv
from soupsieve import SelectorSyntaxError
class TestNthChild(util.TestCase):
"""Test `nth` child selectors."""
def test_nth_child(self):
"""Test `nth` child."""
markup = """
"""
self.assert_selector(
markup,
"p:nth-child(-2)",
[],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(2)",
['1'],
flags=util.HTML
)
def test_nth_child_odd(self):
"""Test `nth` child odd."""
markup = """
"""
self.assert_selector(
markup,
"p:nth-child(odd)",
['0', '8', '10'],
flags=util.HTML
)
def test_nth_child_even(self):
"""Test `nth` child even."""
markup = """
"""
self.assert_selector(
markup,
"p:nth-child(even)",
['1', '7', '9'],
flags=util.HTML
)
def test_nth_child_complex(self):
"""Test `nth` child complex."""
markup = """
"""
self.assert_selector(
markup,
"p:nth-child(2n-5)",
['0', '8', '10'],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(-2n+20)",
['1', '7', '9'],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(50n-20)",
[],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(-2n-2)",
[],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(9n - 1)",
['7'],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(2n + 1)",
['0', '8', '10'],
flags=util.HTML
)
self.assert_selector(
markup,
"p:nth-child(-n+3)",
['0', '1'],
flags=util.HTML
)
self.assert_selector(
markup,
"span:nth-child(-n+3)",
['2'],
flags=util.HTML
)
self.assert_selector(
markup,
"body *:nth-child(-n+3)",
['0', '1', '2'],
flags=util.HTML
)
def test_nth_child_no_parent(self):
"""Test `nth` child with no parent."""
markup = """
"""
for parser in util.available_parsers('html.parser', 'lxml', 'html5lib'):
# Paragraph is the root. There is no document.
markup = """text
"""
soup = self.soup(markup, parser)
fragment = soup.p.extract()
self.assertTrue(sv.match("p:nth-child(1)", fragment, flags=sv.DEBUG))
def test_nth_child_with_bad_parameters(self):
"""Test that pseudo class fails with bad parameters (basically it doesn't match)."""
self.assert_raises(':nth-child(a)', SelectorSyntaxError)
class TestNthChildQuirks(TestNthChild):
"""Test `nth` child selectors with quirks."""
def setUp(self):
"""Setup."""
self.purge()
self.quirks = True