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test_cssselect.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Tests for cssselect
===================
These tests can be run either by py.test or by the standard library's
unittest. They use plain ``assert`` statements and do little reporting
themselves in case of failure.
Use py.test to get fancy error reporting and assert introspection.
:copyright: (c) 2007-2012 Ian Bicking and contributors.
See AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
import sys
import unittest
from lxml import etree, html
from cssselect import (parse, GenericTranslator, HTMLTranslator,
SelectorSyntaxError, ExpressionError)
from cssselect.parser import (tokenize, parse_series, _unicode,
FunctionalPseudoElement)
from cssselect.xpath import _unicode_safe_getattr, XPathExpr
if sys.version_info[0] < 3:
# Python 2
def u(text):
return text.decode('utf8')
else:
# Python 3
def u(text):
return text
class TestCssselect(unittest.TestCase):
def test_tokenizer(self):
tokens = [
_unicode(item) for item in tokenize(
u(r'E\ é > f [a~="y\"x"]:nth(/* fu /]* */-3.7)'))]
assert tokens == [
u("<IDENT 'E é' at 0>"),
"<S ' ' at 4>",
"<DELIM '>' at 5>",
"<S ' ' at 6>",
# the no-break space is not whitespace in CSS
u("<IDENT 'f ' at 7>"), # f\xa0
"<DELIM '[' at 9>",
"<IDENT 'a' at 10>",
"<DELIM '~' at 11>",
"<DELIM '=' at 12>",
"<STRING 'y\"x' at 13>",
"<DELIM ']' at 19>",
"<DELIM ':' at 20>",
"<IDENT 'nth' at 21>",
"<DELIM '(' at 24>",
"<NUMBER '-3.7' at 37>",
"<DELIM ')' at 41>",
"<EOF at 42>",
]
def test_parser(self):
def repr_parse(css):
selectors = parse(css)
for selector in selectors:
assert selector.pseudo_element is None
return [repr(selector.parsed_tree).replace("(u'", "('")
for selector in selectors]
def parse_many(first, *others):
result = repr_parse(first)
for other in others:
assert repr_parse(other) == result
return result
assert parse_many('*') == ['Element[*]']
assert parse_many('*|*') == ['Element[*]']
assert parse_many('*|foo') == ['Element[foo]']
assert parse_many('|foo') == ['Element[foo]']
assert parse_many('foo|*') == ['Element[foo|*]']
assert parse_many('foo|bar') == ['Element[foo|bar]']
# This will never match, but it is valid:
assert parse_many('#foo#bar') == ['Hash[Hash[Element[*]#foo]#bar]']
assert parse_many(
'div>.foo',
'div> .foo',
'div >.foo',
'div > .foo',
'div \n> \t \t .foo', 'div\r>\n\n\n.foo', 'div\f>\f.foo'
) == ['CombinedSelector[Element[div] > Class[Element[*].foo]]']
assert parse_many('td.foo,.bar',
'td.foo, .bar',
'td.foo\t\r\n\f ,\t\r\n\f .bar'
) == [
'Class[Element[td].foo]',
'Class[Element[*].bar]'
]
assert parse_many('div, td.foo, div.bar span') == [
'Element[div]',
'Class[Element[td].foo]',
'CombinedSelector[Class[Element[div].bar] '
'<followed> Element[span]]']
assert parse_many('div > p') == [
'CombinedSelector[Element[div] > Element[p]]']
assert parse_many('td:first') == [
'Pseudo[Element[td]:first]']
assert parse_many('td:first') == [
'Pseudo[Element[td]:first]']
assert parse_many('td :first') == [
'CombinedSelector[Element[td] '
'<followed> Pseudo[Element[*]:first]]']
assert parse_many('td :first') == [
'CombinedSelector[Element[td] '
'<followed> Pseudo[Element[*]:first]]']
assert parse_many('a[name]', 'a[ name\t]') == [
'Attrib[Element[a][name]]']
assert parse_many('a [name]') == [
'CombinedSelector[Element[a] <followed> Attrib[Element[*][name]]]']
assert parse_many('a[rel="include"]', 'a[rel = include]') == [
"Attrib[Element[a][rel = 'include']]"]
assert parse_many("a[hreflang |= 'en']", "a[hreflang|=en]") == [
"Attrib[Element[a][hreflang |= 'en']]"]
assert parse_many('div:nth-child(10)') == [
"Function[Element[div]:nth-child(['10'])]"]
assert parse_many(':nth-child(2n+2)') == [
"Function[Element[*]:nth-child(['2', 'n', '+2'])]"]
assert parse_many('div:nth-of-type(10)') == [
"Function[Element[div]:nth-of-type(['10'])]"]
assert parse_many('div div:nth-of-type(10) .aclass') == [
'CombinedSelector[CombinedSelector[Element[div] <followed> '
"Function[Element[div]:nth-of-type(['10'])]] "
'<followed> Class[Element[*].aclass]]']
assert parse_many('label:only') == [
'Pseudo[Element[label]:only]']
assert parse_many('a:lang(fr)') == [
"Function[Element[a]:lang(['fr'])]"]
assert parse_many('div:contains("foo")') == [
"Function[Element[div]:contains(['foo'])]"]
assert parse_many('div#foobar') == [
'Hash[Element[div]#foobar]']
assert parse_many('div:not(div.foo)') == [
'Negation[Element[div]:not(Class[Element[div].foo])]']
assert parse_many('td ~ th') == [
'CombinedSelector[Element[td] ~ Element[th]]']
assert parse_many(':scope > foo') == [
'CombinedSelector[Pseudo[Element[*]:scope] > Element[foo]]'
]
assert parse_many(' :scope > foo') == [
'CombinedSelector[Pseudo[Element[*]:scope] > Element[foo]]'
]
assert parse_many(':scope > foo bar > div') == [
'CombinedSelector[CombinedSelector[CombinedSelector[Pseudo[Element[*]:scope] > '
'Element[foo]] <followed> Element[bar]] > Element[div]]'
]
assert parse_many(':scope > #foo #bar') == [
'CombinedSelector[CombinedSelector[Pseudo[Element[*]:scope] > '
'Hash[Element[*]#foo]] <followed> Hash[Element[*]#bar]]'
]
def test_pseudo_elements(self):
def parse_pseudo(css):
result = []
for selector in parse(css):
pseudo = selector.pseudo_element
pseudo = _unicode(pseudo) if pseudo else pseudo
# No Symbol here
assert pseudo is None or type(pseudo) is _unicode
selector = repr(selector.parsed_tree).replace("(u'", "('")
result.append((selector, pseudo))
return result
def parse_one(css):
result = parse_pseudo(css)
assert len(result) == 1
return result[0]
def test_pseudo_repr(css):
result = parse(css)
assert len(result) == 1
selector = result[0]
return selector.parsed_tree.__repr__()
assert parse_one('foo') == ('Element[foo]', None)
assert parse_one('*') == ('Element[*]', None)
assert parse_one(':empty') == ('Pseudo[Element[*]:empty]', None)
assert parse_one(':scope') == ('Pseudo[Element[*]:scope]', None)
# Special cases for CSS 2.1 pseudo-elements
assert parse_one(':BEfore') == ('Element[*]', 'before')
assert parse_one(':aftER') == ('Element[*]', 'after')
assert parse_one(':First-Line') == ('Element[*]', 'first-line')
assert parse_one(':First-Letter') == ('Element[*]', 'first-letter')
assert parse_one('::befoRE') == ('Element[*]', 'before')
assert parse_one('::AFter') == ('Element[*]', 'after')
assert parse_one('::firsT-linE') == ('Element[*]', 'first-line')
assert parse_one('::firsT-letteR') == ('Element[*]', 'first-letter')
assert parse_one('::text-content') == ('Element[*]', 'text-content')
assert parse_one('::attr(name)') == (
"Element[*]", "FunctionalPseudoElement[::attr(['name'])]")
assert parse_one('::Selection') == ('Element[*]', 'selection')
assert parse_one('foo:after') == ('Element[foo]', 'after')
assert parse_one('foo::selection') == ('Element[foo]', 'selection')
assert parse_one('lorem#ipsum ~ a#b.c[href]:empty::selection') == (
'CombinedSelector[Hash[Element[lorem]#ipsum] ~ '
'Pseudo[Attrib[Class[Hash[Element[a]#b].c][href]]:empty]]',
'selection')
assert parse_pseudo(':scope > div, foo bar') == [
('CombinedSelector[Pseudo[Element[*]:scope] > Element[div]]', None),
('CombinedSelector[Element[foo] <followed> Element[bar]]', None)
]
assert parse_pseudo('foo:before, bar, baz:after') == [
('Element[foo]', 'before'), ('Element[bar]', None),
('Element[baz]', 'after')
]
# Special cases for CSS 2.1 pseudo-elements are ignored by default
for pseudo in ('after', 'before', 'first-line', 'first-letter'):
selector, = parse('e:%s' % pseudo)
assert selector.pseudo_element == pseudo
assert GenericTranslator().selector_to_xpath(selector, prefix='') == "e"
# Pseudo Elements are ignored by default, but if allowed they are not
# supported by GenericTranslator
tr = GenericTranslator()
selector, = parse('e::foo')
assert selector.pseudo_element == 'foo'
assert tr.selector_to_xpath(selector, prefix='') == "e"
self.assertRaises(ExpressionError, tr.selector_to_xpath, selector,
translate_pseudo_elements=True)
# Special test for the unicode symbols and ':scope' element if check
# Errors if use repr() instead of __repr__()
assert test_pseudo_repr(u':fİrst-child') == u'Pseudo[Element[*]:fİrst-child]'
assert test_pseudo_repr(':scope') == 'Pseudo[Element[*]:scope]'
def test_specificity(self):
def specificity(css):
selectors = parse(css)
assert len(selectors) == 1
return selectors[0].specificity()
assert specificity('*') == (0, 0, 0)
assert specificity(' foo') == (0, 0, 1)
assert specificity(':empty ') == (0, 1, 0)
assert specificity(':before') == (0, 0, 1)
assert specificity('*:before') == (0, 0, 1)
assert specificity(':nth-child(2)') == (0, 1, 0)
assert specificity('.bar') == (0, 1, 0)
assert specificity('[baz]') == (0, 1, 0)
assert specificity('[baz="4"]') == (0, 1, 0)
assert specificity('[baz^="4"]') == (0, 1, 0)
assert specificity('#lipsum') == (1, 0, 0)
assert specificity(':not(*)') == (0, 0, 0)
assert specificity(':not(foo)') == (0, 0, 1)
assert specificity(':not(.foo)') == (0, 1, 0)
assert specificity(':not([foo])') == (0, 1, 0)
assert specificity(':not(:empty)') == (0, 1, 0)
assert specificity(':not(#foo)') == (1, 0, 0)
assert specificity('foo:empty') == (0, 1, 1)
assert specificity('foo:before') == (0, 0, 2)
assert specificity('foo::before') == (0, 0, 2)
assert specificity('foo:empty::before') == (0, 1, 2)
assert specificity('#lorem + foo#ipsum:first-child > bar:first-line'
) == (2, 1, 3)
def test_css_export(self):
def css2css(css, res=None):
selectors = parse(css)
assert len(selectors) == 1
assert selectors[0].canonical() == (res or css)
css2css('*')
css2css(' foo', 'foo')
css2css('Foo', 'Foo')
css2css(':empty ', ':empty')
css2css(':before', '::before')
css2css(':beFOre', '::before')
css2css('*:before', '::before')
css2css(':nth-child(2)')
css2css('.bar')
css2css('[baz]')
css2css('[baz="4"]', "[baz='4']")
css2css('[baz^="4"]', "[baz^='4']")
css2css("[ns|attr='4']")
css2css('#lipsum')
css2css(':not(*)')
css2css(':not(foo)')
css2css(':not(*.foo)', ':not(.foo)')
css2css(':not(*[foo])', ':not([foo])')
css2css(':not(:empty)')
css2css(':not(#foo)')
css2css('foo:empty')
css2css('foo::before')
css2css('foo:empty::before')
css2css('::name(arg + "val" - 3)', "::name(arg+'val'-3)")
css2css('#lorem + foo#ipsum:first-child > bar::first-line')
css2css('foo > *')
def test_parse_errors(self):
def get_error(css):
try:
parse(css)
except SelectorSyntaxError:
# Py2, Py3, ...
return str(sys.exc_info()[1]).replace("(u'", "('")
assert get_error('attributes(href)/html/body/a') == (
"Expected selector, got <DELIM '(' at 10>")
assert get_error('attributes(href)') == (
"Expected selector, got <DELIM '(' at 10>")
assert get_error('html/body/a') == (
"Expected selector, got <DELIM '/' at 4>")
assert get_error(' ') == (
"Expected selector, got <EOF at 1>")
assert get_error('div, ') == (
"Expected selector, got <EOF at 5>")
assert get_error(' , div') == (
"Expected selector, got <DELIM ',' at 1>")
assert get_error('p, , div') == (
"Expected selector, got <DELIM ',' at 3>")
assert get_error('div > ') == (
"Expected selector, got <EOF at 6>")
assert get_error(' > div') == (
"Expected selector, got <DELIM '>' at 2>")
assert get_error('foo|#bar') == (
"Expected ident or '*', got <HASH 'bar' at 4>")
assert get_error('#.foo') == (
"Expected selector, got <DELIM '#' at 0>")
assert get_error('.#foo') == (
"Expected ident, got <HASH 'foo' at 1>")
assert get_error(':#foo') == (
"Expected ident, got <HASH 'foo' at 1>")
assert get_error('[*]') == (
"Expected '|', got <DELIM ']' at 2>")
assert get_error('[foo|]') == (
"Expected ident, got <DELIM ']' at 5>")
assert get_error('[#]') == (
"Expected ident or '*', got <DELIM '#' at 1>")
assert get_error('[foo=#]') == (
"Expected string or ident, got <DELIM '#' at 5>")
assert get_error('[href]a') == (
"Expected selector, got <IDENT 'a' at 6>")
assert get_error('[rel=stylesheet]') is None
assert get_error('[rel:stylesheet]') == (
"Operator expected, got <DELIM ':' at 4>")
assert get_error('[rel=stylesheet') == (
"Expected ']', got <EOF at 15>")
assert get_error(':lang(fr)') is None
assert get_error(':lang(fr') == (
"Expected an argument, got <EOF at 8>")
assert get_error(':contains("foo') == (
"Unclosed string at 10")
assert get_error('foo!') == (
"Expected selector, got <DELIM '!' at 3>")
# Mis-placed pseudo-elements
assert get_error('a:before:empty') == (
"Got pseudo-element ::before not at the end of a selector")
assert get_error('li:before a') == (
"Got pseudo-element ::before not at the end of a selector")
assert get_error(':not(:before)') == (
"Got pseudo-element ::before inside :not() at 12")
assert get_error(':not(:not(a))') == (
"Got nested :not()")
assert get_error(':scope > div :scope header') == (
'Got immediate child pseudo-element ":scope" not at the start of a selector'
)
assert get_error('div :scope header') == (
'Got immediate child pseudo-element ":scope" not at the start of a selector'
)
assert get_error('> div p') == ("Expected selector, got <DELIM '>' at 0>")
def test_translation(self):
def xpath(css):
return _unicode(GenericTranslator().css_to_xpath(css, prefix=''))
assert xpath('*') == "*"
assert xpath('e') == "e"
assert xpath('*|e') == "e"
assert xpath('e|f') == "e:f"
assert xpath('e[foo]') == "e[@foo]"
assert xpath('e[foo|bar]') == "e[@foo:bar]"
assert xpath('e[foo="bar"]') == "e[@foo = 'bar']"
assert xpath('e[foo~="bar"]') == (
"e[@foo and contains("
"concat(' ', normalize-space(@foo), ' '), ' bar ')]")
assert xpath('e[foo^="bar"]') == (
"e[@foo and starts-with(@foo, 'bar')]")
assert xpath('e[foo$="bar"]') == (
"e[@foo and substring(@foo, string-length(@foo)-2) = 'bar']")
assert xpath('e[foo*="bar"]') == (
"e[@foo and contains(@foo, 'bar')]")
assert xpath('e[hreflang|="en"]') == (
"e[@hreflang and ("
"@hreflang = 'en' or starts-with(@hreflang, 'en-'))]")
# --- nth-* and nth-last-* -------------------------------------
assert xpath('e:nth-child(1)') == (
"e[count(preceding-sibling::*) = 0]")
# always true
assert xpath('e:nth-child(n)') == (
"e")
assert xpath('e:nth-child(n+1)') == (
"e")
# always true too
assert xpath('e:nth-child(n-10)') == (
"e")
# b=2 is the limit...
assert xpath('e:nth-child(n+2)') == (
"e[count(preceding-sibling::*) >= 1]")
# always false
assert xpath('e:nth-child(-n)') == (
"e[0]")
# equivalent to first child
assert xpath('e:nth-child(-n+1)') == (
"e[count(preceding-sibling::*) <= 0]")
assert xpath('e:nth-child(3n+2)') == (
"e[(count(preceding-sibling::*) >= 1) and "
"((count(preceding-sibling::*) +2) mod 3 = 0)]")
assert xpath('e:nth-child(3n-2)') == (
"e[count(preceding-sibling::*) mod 3 = 0]")
assert xpath('e:nth-child(-n+6)') == (
"e[count(preceding-sibling::*) <= 5]")
assert xpath('e:nth-last-child(1)') == (
"e[count(following-sibling::*) = 0]")
assert xpath('e:nth-last-child(2n)') == (
"e[(count(following-sibling::*) +1) mod 2 = 0]")
assert xpath('e:nth-last-child(2n+1)') == (
"e[count(following-sibling::*) mod 2 = 0]")
assert xpath('e:nth-last-child(2n+2)') == (
"e[(count(following-sibling::*) >= 1) and "
"((count(following-sibling::*) +1) mod 2 = 0)]")
assert xpath('e:nth-last-child(3n+1)') == (
"e[count(following-sibling::*) mod 3 = 0]")
# represents the two last e elements
assert xpath('e:nth-last-child(-n+2)') == (
"e[count(following-sibling::*) <= 1]")
assert xpath('e:nth-of-type(1)') == (
"e[count(preceding-sibling::e) = 0]")
assert xpath('e:nth-last-of-type(1)') == (
"e[count(following-sibling::e) = 0]")
assert xpath('div e:nth-last-of-type(1) .aclass') == (
"div/descendant-or-self::*/e[count(following-sibling::e) = 0]"
"/descendant-or-self::*/*[@class and contains("
"concat(' ', normalize-space(@class), ' '), ' aclass ')]")
assert xpath('e:first-child') == (
"e[count(preceding-sibling::*) = 0]")
assert xpath('e:last-child') == (
"e[count(following-sibling::*) = 0]")
assert xpath('e:first-of-type') == (
"e[count(preceding-sibling::e) = 0]")
assert xpath('e:last-of-type') == (
"e[count(following-sibling::e) = 0]")
assert xpath('e:only-child') == (
"e[count(parent::*/child::*) = 1]")
assert xpath('e:only-of-type') == (
"e[count(parent::*/child::e) = 1]")
assert xpath('e:empty') == (
"e[not(*) and not(string-length())]")
assert xpath('e:EmPTY') == (
"e[not(*) and not(string-length())]")
assert xpath('e:root') == (
"e[not(parent::*)]")
assert xpath('e:hover') == (
"e[0]") # never matches
assert xpath('e:contains("foo")') == (
"e[contains(., 'foo')]")
assert xpath('e:ConTains(foo)') == (
"e[contains(., 'foo')]")
assert xpath('e.warning') == (
"e[@class and contains("
"concat(' ', normalize-space(@class), ' '), ' warning ')]")
assert xpath('e#myid') == (
"e[@id = 'myid']")
assert xpath('e:not(:nth-child(odd))') == (
"e[not(count(preceding-sibling::*) mod 2 = 0)]")
assert xpath('e:nOT(*)') == (
"e[0]") # never matches
assert xpath('e f') == (
"e/descendant-or-self::*/f")
assert xpath('e > f') == (
"e/f")
assert xpath('e + f') == (
"e/following-sibling::*[(name() = 'f') and (position() = 1)]")
assert xpath('e ~ f') == (
"e/following-sibling::f")
assert xpath('e ~ f:nth-child(3)') == (
"e/following-sibling::f[count(preceding-sibling::*) = 2]")
assert xpath('div#container p') == (
"div[@id = 'container']/descendant-or-self::*/p")
# Invalid characters in XPath element names
assert xpath(r'di\a0 v') == (
u("*[name() = 'di v']")) # di\xa0v
assert xpath(r'di\[v') == (
"*[name() = 'di[v']")
assert xpath(r'[h\a0 ref]') == (
u("*[attribute::*[name() = 'h ref']]")) # h\xa0ref
assert xpath(r'[h\]ref]') == (
"*[attribute::*[name() = 'h]ref']]")
self.assertRaises(ExpressionError, xpath, u(':fİrst-child'))
self.assertRaises(ExpressionError, xpath, ':first-of-type')
self.assertRaises(ExpressionError, xpath, ':only-of-type')
self.assertRaises(ExpressionError, xpath, ':last-of-type')
self.assertRaises(ExpressionError, xpath, ':nth-of-type(1)')
self.assertRaises(ExpressionError, xpath, ':nth-last-of-type(1)')
self.assertRaises(ExpressionError, xpath, ':nth-child(n-)')
self.assertRaises(ExpressionError, xpath, ':after')
self.assertRaises(ExpressionError, xpath, ':lorem-ipsum')
self.assertRaises(ExpressionError, xpath, ':lorem(ipsum)')
self.assertRaises(ExpressionError, xpath, '::lorem-ipsum')
self.assertRaises(ExpressionError, xpath, '#00FF55')
self.assertRaises(ExpressionError, xpath, '#--abc')
self.assertRaises(ExpressionError, xpath, '#-1abc')
self.assertRaises(TypeError, GenericTranslator().css_to_xpath, 4)
self.assertRaises(TypeError, GenericTranslator().selector_to_xpath,
'foo')
def test_unicode(self):
if sys.version_info[0] < 3:
css = '.a\xc1b'.decode('ISO-8859-1')
else:
css = '.a\xc1b'
xpath = GenericTranslator().css_to_xpath(css)
assert css[1:] in xpath
xpath = xpath.encode('ascii', 'xmlcharrefreplace').decode('ASCII')
assert xpath == (
"descendant-or-self::*[@class and contains("
"concat(' ', normalize-space(@class), ' '), ' aÁb ')]")
def test_quoting(self):
css_to_xpath = GenericTranslator().css_to_xpath
assert css_to_xpath('*[aval="\'"]') == (
'''descendant-or-self::*[@aval = "'"]''')
assert css_to_xpath('*[aval="\'\'\'"]') == (
"""descendant-or-self::*[@aval = "'''"]""")
assert css_to_xpath('*[aval=\'"\']') == (
'''descendant-or-self::*[@aval = '"']''')
assert css_to_xpath('*[aval=\'"""\']') == (
'''descendant-or-self::*[@aval = '"""']''')
assert css_to_xpath(':scope > div[dataimg="<testmessage>"]') == (
"descendant-or-self::*[1]/div[@dataimg = '<testmessage>']")
def test_unicode_escapes(self):
# \22 == '"' \20 == ' '
css_to_xpath = GenericTranslator().css_to_xpath
assert css_to_xpath(r'*[aval="\'\22\'"]') == (
'''descendant-or-self::*[@aval = concat("'",'"',"'")]''')
assert css_to_xpath(r'*[aval="\'\22 2\'"]') == (
'''descendant-or-self::*[@aval = concat("'",'"2',"'")]''')
assert css_to_xpath(r'*[aval="\'\20 \'"]') == (
'''descendant-or-self::*[@aval = "' '"]''')
assert css_to_xpath('*[aval="\'\\20\r\n \'"]') == (
'''descendant-or-self::*[@aval = "' '"]''')
def test_xpath_pseudo_elements(self):
class CustomTranslator(GenericTranslator):
def xpath_pseudo_element(self, xpath, pseudo_element):
if isinstance(pseudo_element, FunctionalPseudoElement):
method = 'xpath_%s_functional_pseudo_element' % (
pseudo_element.name.replace('-', '_'))
method = _unicode_safe_getattr(self, method, None)
if not method:
raise ExpressionError(
"The functional pseudo-element ::%s() is unknown"
% pseudo_element.name)
xpath = method(xpath, pseudo_element.arguments)
else:
method = 'xpath_%s_simple_pseudo_element' % (
pseudo_element.replace('-', '_'))
method = _unicode_safe_getattr(self, method, None)
if not method:
raise ExpressionError(
"The pseudo-element ::%s is unknown"
% pseudo_element)
xpath = method(xpath)
return xpath
# functional pseudo-class:
# elements that have a certain number of attributes
def xpath_nb_attr_function(self, xpath, function):
nb_attributes = int(function.arguments[0].value)
return xpath.add_condition(
"count(@*)=%d" % nb_attributes)
# pseudo-class:
# elements that have 5 attributes
def xpath_five_attributes_pseudo(self, xpath):
return xpath.add_condition("count(@*)=5")
# functional pseudo-element:
# element's attribute by name
def xpath_attr_functional_pseudo_element(self, xpath, arguments):
attribute_name = arguments[0].value
other = XPathExpr('@%s' % attribute_name, '', )
return xpath.join('/', other)
# pseudo-element:
# element's text() nodes
def xpath_text_node_simple_pseudo_element(self, xpath):
other = XPathExpr('text()', '', )
return xpath.join('/', other)
# pseudo-element:
# element's href attribute
def xpath_attr_href_simple_pseudo_element(self, xpath):
other = XPathExpr('@href', '', )
return xpath.join('/', other)
# pseudo-element:
# used to demonstrate operator precedence
def xpath_first_or_second_pseudo(self, xpath):
return xpath.add_condition("@id = 'first' or @id = 'second'")
def xpath(css):
return _unicode(CustomTranslator().css_to_xpath(css))
assert xpath(':five-attributes') == "descendant-or-self::*[count(@*)=5]"
assert xpath(':nb-attr(3)') == "descendant-or-self::*[count(@*)=3]"
assert xpath('::attr(href)') == "descendant-or-self::*/@href"
assert xpath('::text-node') == "descendant-or-self::*/text()"
assert xpath('::attr-href') == "descendant-or-self::*/@href"
assert xpath('p img::attr(src)') == (
"descendant-or-self::p/descendant-or-self::*/img/@src")
assert xpath(':scope') == "descendant-or-self::*[1]"
assert xpath(':first-or-second[href]') == (
"descendant-or-self::*[(@id = 'first' or @id = 'second') "
"and (@href)]")
assert str(XPathExpr('', '', condition='@href')) == "[@href]"
document = etree.fromstring(OPERATOR_PRECEDENCE_IDS)
sort_key = dict(
(el, count) for count, el in enumerate(document.getiterator())
).__getitem__
def operator_id(selector):
xpath = CustomTranslator().css_to_xpath(selector)
items = document.xpath(xpath)
items.sort(key=sort_key)
return [element.get('id', 'nil') for element in items]
assert operator_id(':first-or-second') == ['first', 'second']
assert operator_id(':first-or-second[href]') == ['second']
assert operator_id('[href]:first-or-second') == ['second']
def test_series(self):
def series(css):
selector, = parse(':nth-child(%s)' % css)
args = selector.parsed_tree.arguments
try:
return parse_series(args)
except ValueError:
return None
assert series('1n+3') == (1, 3)
assert series('1n +3') == (1, 3)
assert series('1n + 3') == (1, 3)
assert series('1n+ 3') == (1, 3)
assert series('1n-3') == (1, -3)
assert series('1n -3') == (1, -3)
assert series('1n - 3') == (1, -3)
assert series('1n- 3') == (1, -3)
assert series('n-5') == (1, -5)
assert series('odd') == (2, 1)
assert series('even') == (2, 0)
assert series('3n') == (3, 0)
assert series('n') == (1, 0)
assert series('+n') == (1, 0)
assert series('-n') == (-1, 0)
assert series('5') == (0, 5)
assert series('foo') is None
assert series('n+') is None
def test_lang(self):
document = etree.fromstring(XMLLANG_IDS)
sort_key = dict(
(el, count) for count, el in enumerate(document.getiterator())
).__getitem__
css_to_xpath = GenericTranslator().css_to_xpath
def langid(selector):
xpath = css_to_xpath(selector)
items = document.xpath(xpath)
items.sort(key=sort_key)
return [element.get('id', 'nil') for element in items]
assert langid(':lang("EN")') == ['first', 'second', 'third', 'fourth']
assert langid(':lang("en-us")') == ['second', 'fourth']
assert langid(':lang(en-nz)') == ['third']
assert langid(':lang(fr)') == ['fifth']
assert langid(':lang(ru)') == ['sixth']
assert langid(":lang('ZH')") == ['eighth']
assert langid(':lang(de) :lang(zh)') == ['eighth']
assert langid(':lang(en), :lang(zh)') == [
'first', 'second', 'third', 'fourth', 'eighth']
assert langid(':lang(es)') == []
def test_select(self):
document = etree.fromstring(HTML_IDS)
sort_key = dict(
(el, count) for count, el in enumerate(document.getiterator())
).__getitem__
css_to_xpath = GenericTranslator().css_to_xpath
html_css_to_xpath = HTMLTranslator().css_to_xpath
def select_ids(selector, html_only):
xpath = css_to_xpath(selector)
items = document.xpath(xpath)
if html_only:
assert items == []
xpath = html_css_to_xpath(selector)
items = document.xpath(xpath)
items.sort(key=sort_key)
return [element.get('id', 'nil') for element in items]
def pcss(main, *selectors, **kwargs):
html_only = kwargs.pop('html_only', False)
result = select_ids(main, html_only)
for selector in selectors:
assert select_ids(selector, html_only) == result
return result
all_ids = pcss('*')
assert all_ids[:6] == [
'html', 'nil', 'link-href', 'link-nohref', 'nil', 'outer-div']
assert all_ids[-1:] == ['foobar-span']
assert pcss('div') == ['outer-div', 'li-div', 'foobar-div']
assert pcss('DIV', html_only=True) == [
'outer-div', 'li-div', 'foobar-div'] # case-insensitive in HTML
assert pcss('div div') == ['li-div']
assert pcss('div, div div') == ['outer-div', 'li-div', 'foobar-div']
assert pcss('a[name]') == ['name-anchor']
assert pcss('a[NAme]', html_only=True) == [
'name-anchor'] # case-insensitive in HTML:
assert pcss('a[rel]') == ['tag-anchor', 'nofollow-anchor']
assert pcss('a[rel="tag"]') == ['tag-anchor']
assert pcss('a[href*="localhost"]') == ['tag-anchor']
assert pcss('a[href*=""]') == []
assert pcss('a[href^="http"]') == ['tag-anchor', 'nofollow-anchor']
assert pcss('a[href^="http:"]') == ['tag-anchor']
assert pcss('a[href^=""]') == []
assert pcss('a[href$="org"]') == ['nofollow-anchor']
assert pcss('a[href$=""]') == []
assert pcss('div[foobar~="bc"]', 'div[foobar~="cde"]') == [
'foobar-div']
assert pcss('[foobar~="ab bc"]',
'[foobar~=""]', '[foobar~=" \t"]') == []
assert pcss('div[foobar~="cd"]') == []
assert pcss('*[lang|="En"]', '[lang|="En-us"]') == ['second-li']
# Attribute values are case sensitive
assert pcss('*[lang|="en"]', '[lang|="en-US"]') == []
assert pcss('*[lang|="e"]') == []
# ... :lang() is not.
assert pcss(':lang("EN")', '*:lang(en-US)', html_only=True) == [
'second-li', 'li-div']
assert pcss(':lang("e")', html_only=True) == []
assert pcss(':scope > div') == []
assert pcss(':scope body') == ['nil']
assert pcss(':scope body > div') == ['outer-div', 'foobar-div']
assert pcss(':scope head') == ['nil']
assert pcss(':scope html') == []
# --- nth-* and nth-last-* -------------------------------------
# select nothing
assert pcss('li:nth-child(-n)') == []
# select all children
assert pcss('li:nth-child(n)') == [
'first-li', 'second-li', 'third-li', 'fourth-li',
'fifth-li', 'sixth-li', 'seventh-li']
assert pcss('li:nth-child(3)',
'#first-li ~ :nth-child(3)') == ['third-li']
assert pcss('li:nth-child(10)') == []
assert pcss('li:nth-child(2n)', 'li:nth-child(even)',
'li:nth-child(2n+0)') == [
'second-li', 'fourth-li', 'sixth-li']
assert pcss('li:nth-child(+2n+1)', 'li:nth-child(odd)') == [
'first-li', 'third-li', 'fifth-li', 'seventh-li']
assert pcss('li:nth-child(2n+4)') == ['fourth-li', 'sixth-li']
assert pcss('li:nth-child(3n+1)') == [
'first-li', 'fourth-li', 'seventh-li']
assert pcss('li:nth-child(-n+3)') == [
'first-li', 'second-li', 'third-li']
assert pcss('li:nth-child(-2n+4)') == ['second-li', 'fourth-li']
assert pcss('li:nth-last-child(0)') == []
assert pcss('li:nth-last-child(1)') == ['seventh-li']
assert pcss('li:nth-last-child(2n)', 'li:nth-last-child(even)') == [
'second-li', 'fourth-li', 'sixth-li']
assert pcss('li:nth-last-child(2n+1)') == [
'first-li', 'third-li', 'fifth-li', 'seventh-li']
assert pcss('li:nth-last-child(2n+2)') == [
'second-li', 'fourth-li', 'sixth-li']
assert pcss('li:nth-last-child(3n+1)') == [
'first-li', 'fourth-li', 'seventh-li']
assert pcss('ol:first-of-type') == ['first-ol']
assert pcss('ol:nth-child(1)') == []
assert pcss('ol:nth-of-type(2)') == ['second-ol']
assert pcss('ol:nth-last-of-type(1)') == ['second-ol']
# "+" and "~" tests
assert pcss('ol#first-ol li + li:nth-child(4)') == ['fourth-li']
assert pcss('li + li:nth-child(1)') == []
assert pcss('li ~ li:nth-child(2n+1)') == [
'third-li', 'fifth-li', 'seventh-li'
] # all but the first
assert pcss('li ~ li:nth-last-child(2n+1)') == [
'third-li', 'fifth-li', 'seventh-li'
] # all but the first
assert pcss('span:only-child') == ['foobar-span']
assert pcss('li div:only-child') == ['li-div']
assert pcss('div *:only-child') == ['li-div', 'foobar-span']
self.assertRaises(ExpressionError, pcss, 'p *:only-of-type')
assert pcss('p:only-of-type') == ['paragraph']
assert pcss('a:empty', 'a:EMpty') == ['name-anchor']
assert pcss('li:empty') == [
'third-li', 'fourth-li', 'fifth-li', 'sixth-li']
assert pcss(':root', 'html:root') == ['html']
assert pcss('li:root', '* :root') == []
assert pcss('*:contains("link")', ':CONtains("link")') == [
'html', 'nil', 'outer-div', 'tag-anchor', 'nofollow-anchor']
assert pcss('*:contains("LInk")') == [] # case sensitive
assert pcss('*:contains("e")') == [
'html', 'nil', 'outer-div', 'first-ol', 'first-li',
'paragraph', 'p-em']
assert pcss('*:contains("E")') == [] # case-sensitive
assert pcss('.a', '.b', '*.a', 'ol.a') == ['first-ol']
assert pcss('.c', '*.c') == ['first-ol', 'third-li', 'fourth-li']
assert pcss('ol *.c', 'ol li.c', 'li ~ li.c', 'ol > li.c') == [
'third-li', 'fourth-li']
assert pcss('#first-li', 'li#first-li', '*#first-li') == ['first-li']
assert pcss('li div', 'li > div', 'div div') == ['li-div']
assert pcss('div > div') == []
assert pcss('div>.c', 'div > .c') == ['first-ol']
assert pcss('div + div') == ['foobar-div']
assert pcss('a ~ a') == ['tag-anchor', 'nofollow-anchor']
assert pcss('a[rel="tag"] ~ a') == ['nofollow-anchor']
assert pcss('ol#first-ol li:last-child') == ['seventh-li']
assert pcss('ol#first-ol *:last-child') == ['li-div', 'seventh-li']
assert pcss('#outer-div:first-child') == ['outer-div']
assert pcss('#outer-div :first-child') == [
'name-anchor', 'first-li', 'li-div', 'p-b',
'checkbox-fieldset-disabled', 'area-href']
assert pcss('a[href]') == ['tag-anchor', 'nofollow-anchor']
assert pcss(':not(*)') == []
assert pcss('a:not([href])') == ['name-anchor']
assert pcss('ol :Not(li[class])') == [
'first-li', 'second-li', 'li-div',
'fifth-li', 'sixth-li', 'seventh-li']
assert pcss('ol.a.b.c > li.c:nth-child(3)') == ['third-li']
# Invalid characters in XPath element names, should not crash
assert pcss(r'di\a0 v', r'div\[') == []
assert pcss(r'[h\a0 ref]', r'[h\]ref]') == []
# HTML-specific
assert pcss(':link', html_only=True) == [
'link-href', 'tag-anchor', 'nofollow-anchor', 'area-href']
assert pcss(':visited', html_only=True) == []
assert pcss(':enabled', html_only=True) == [
'link-href', 'tag-anchor', 'nofollow-anchor',
'checkbox-unchecked', 'text-checked', 'checkbox-checked',
'area-href']
assert pcss(':disabled', html_only=True) == [
'checkbox-disabled', 'checkbox-disabled-checked', 'fieldset',
'checkbox-fieldset-disabled']
assert pcss(':checked', html_only=True) == [
'checkbox-checked', 'checkbox-disabled-checked']
def test_select_shakespeare(self):
document = html.document_fromstring(HTML_SHAKESPEARE)
body = document.xpath('//body')[0]
css_to_xpath = GenericTranslator().css_to_xpath
try:
basestring_ = basestring
except NameError:
basestring_ = (str, bytes)
def count(selector):
xpath = css_to_xpath(selector)
results = body.xpath(xpath)
assert not isinstance(results, basestring_)
found = set()
for item in results:
assert item not in found
found.add(item)
assert not isinstance(item, basestring_)
return len(results)
# Data borrowed from http://mootools.net/slickspeed/
## Changed from original; probably because I'm only
## searching the body.
#assert count('*') == 252
assert count('*') == 246
assert count('div:contains(CELIA)') == 26
assert count('div:only-child') == 22 # ?
assert count('div:nth-child(even)') == 106
assert count('div:nth-child(2n)') == 106
assert count('div:nth-child(odd)') == 137
assert count('div:nth-child(2n+1)') == 137
assert count('div:nth-child(n)') == 243
assert count('div:last-child') == 53
assert count('div:first-child') == 51
assert count('div > div') == 242
assert count('div + div') == 190
assert count('div ~ div') == 190
assert count('body') == 1
assert count('body div') == 243
assert count('div') == 243
assert count('div div') == 242
assert count('div div div') == 241
assert count('div, div, div') == 243
assert count('div, a, span') == 243
assert count('.dialog') == 51
assert count('div.dialog') == 51
assert count('div .dialog') == 51
assert count('div.character, div.dialog') == 99
assert count('div.direction.dialog') == 0
assert count('div.dialog.direction') == 0
assert count('div.dialog.scene') == 1
assert count('div.scene.scene') == 1
assert count('div.scene .scene') == 0
assert count('div.direction .dialog ') == 0
assert count('div .dialog .direction') == 4
assert count('div.dialog .dialog .direction') == 4
assert count('#speech5') == 1
assert count('div#speech5') == 1
assert count('div #speech5') == 1
assert count('div.scene div.dialog') == 49
assert count('div#scene1 div.dialog div') == 142
assert count('#scene1 #speech1') == 1
assert count('div[class]') == 103
assert count('div[class=dialog]') == 50
assert count('div[class^=dia]') == 51
assert count('div[class$=log]') == 50
assert count('div[class*=sce]') == 1
assert count('div[class|=dialog]') == 50 # ? Seems right
assert count('div[class!=madeup]') == 243 # ? Seems right
assert count('div[class~=dialog]') == 51 # ? Seems right
assert count(':scope > div') == 1
assert count(':scope > div > div[class=dialog]') == 1
assert count(':scope > div div') == 242
OPERATOR_PRECEDENCE_IDS = '''
<html>
<a id="first"></a>
<a id="second" href="#"></a>
<a id="third" href="#"></a>
</html>
'''
XMLLANG_IDS = '''
<test>
<a id="first" xml:lang="en">a</a>
<b id="second" xml:lang="en-US">b</b>
<c id="third" xml:lang="en-Nz">c</c>
<d id="fourth" xml:lang="En-us">d</d>
<e id="fifth" xml:lang="fr">e</e>
<f id="sixth" xml:lang="ru">f</f>
<g id="seventh" xml:lang="de">
<h id="eighth" xml:lang="zh"/>
</g>
</test>
'''
HTML_IDS = '''
<html id="html"><head>
<link id="link-href" href="foo" />
<link id="link-nohref" />
</head><body>
<div id="outer-div">
<a id="name-anchor" name="foo"></a>
<a id="tag-anchor" rel="tag" href="http://localhost/foo">link</a>
<a id="nofollow-anchor" rel="nofollow" href="https://example.org">
link</a>
<ol id="first-ol" class="a b c">
<li id="first-li">content</li>
<li id="second-li" lang="En-us">
<div id="li-div">