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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 typing
import unittest
from typing import List, Optional, Sequence, Tuple
from lxml import etree, html
from cssselect import (
parse,
GenericTranslator,
HTMLTranslator,
SelectorSyntaxError,
ExpressionError,
)
from cssselect.parser import (
tokenize,
parse_series,
PseudoElement,
FunctionalPseudoElement,
Function,
Token,
)
from cssselect.xpath import XPathExpr
class TestCssselect(unittest.TestCase):
def test_tokenizer(self) -> None:
tokens = [str(item) for item in tokenize(r'E\ é > f [a~="y\"x"]:nth(/* fu /]* */-3.7)')]
assert tokens == [
"<IDENT 'E é' at 0>",
"<S ' ' at 4>",
"<DELIM '>' at 5>",
"<S ' ' at 6>",
# the no-break space is not whitespace in CSS
"<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) -> None:
def repr_parse(css: str) -> List[str]:
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: str, *others: str) -> List[str]:
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("div:has(div.foo)") == [
"Relation[Element[div]:has(Selector[Class[Element[div].foo]])]"
]
assert parse_many("div:is(.foo, #bar)") == [
"Matching[Element[div]:is(Class[Element[*].foo], Hash[Element[*]#bar])]"
]
assert parse_many(":is(:hover, :visited)") == [
"Matching[Element[*]:is(Pseudo[Element[*]:hover], Pseudo[Element[*]:visited])]"
]
assert parse_many(":where(:hover, :visited)") == [
"SpecificityAdjustment[Element[*]:where(Pseudo[Element[*]:hover],"
" Pseudo[Element[*]:visited])]"
]
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) -> None:
def parse_pseudo(css: str) -> List[Tuple[str, Optional[str]]]:
result: List[Tuple[str, Optional[str]]] = []
for selector in parse(css):
pseudo = selector.pseudo_element
pseudo = str(pseudo) if pseudo else pseudo
# No Symbol here
assert pseudo is None or type(pseudo) is str
selector_as_str = repr(selector.parsed_tree).replace("(u'", "('")
result.append((selector_as_str, pseudo))
return result
def parse_one(css: str) -> Tuple[str, Optional[str]]:
result = parse_pseudo(css)
assert len(result) == 1
return result[0]
def test_pseudo_repr(css: str) -> str:
result = parse(css)
assert len(result) == 1
selector = result[0]
return repr(selector.parsed_tree)
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 bar, :scope > div") == [
("CombinedSelector[Element[foo] <followed> Element[bar]]", None),
("CombinedSelector[Pseudo[Element[*]:scope] > Element[div]]", None),
]
assert parse_pseudo("foo bar,:scope > div") == [
("CombinedSelector[Element[foo] <followed> Element[bar]]", None),
("CombinedSelector[Pseudo[Element[*]:scope] > Element[div]]", 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(":fİrst-child") == "Pseudo[Element[*]:fİrst-child]"
assert test_pseudo_repr(":scope") == "Pseudo[Element[*]:scope]"
def test_specificity(self) -> None:
def specificity(css: str) -> Tuple[int, int, int]:
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("::attr(name)") == (0, 0, 1)
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(":has(*)") == (0, 0, 0)
assert specificity(":has(foo)") == (0, 0, 1)
assert specificity(":has(.foo)") == (0, 1, 0)
assert specificity(":has(> foo)") == (0, 0, 1)
assert specificity(":is(.foo, #bar)") == (1, 0, 0)
assert specificity(":is(:hover, :visited)") == (0, 1, 0)
assert specificity(":where(:hover, :visited)") == (0, 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) -> None:
def css2css(css: str, res: Optional[str] = None) -> 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(":has(*)")
css2css(":has(foo)")
css2css(":has(*.foo)", ":has(.foo)")
css2css(":is(#bar, .foo)")
css2css(":is(:focused, :visited)")
css2css(":where(:focused, :visited)")
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) -> None:
def get_error(css: str) -> Optional[str]:
try:
parse(css)
except SelectorSyntaxError:
# Py2, Py3, ...
return str(sys.exc_info()[1]).replace("(u'", "('")
return None
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(":is(:before)") == ("Got pseudo-element ::before inside function")
assert get_error(":is(a b)") == ("Expected an argument, got <IDENT 'b' at 6>")
assert get_error(":where(:before)") == ("Got pseudo-element ::before inside function")
assert get_error(":where(a b)") == ("Expected an argument, got <IDENT 'b' at 9>")
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>")
# Unsupported :has() with several arguments
assert get_error(":has(a, b)") == ("Expected an argument, got <DELIM ',' at 6>")
assert get_error(":has()") == ("Expected selector, got <EOF at 0>")
def test_translation(self) -> None:
def xpath(css: str) -> str:
return str(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(2n+1 of S)") == "e[count(preceding-sibling::S) mod 2 = 0]"
assert xpath("e:nth-of-type(2n+1 of S)") == "e[count(preceding-sibling::S) mod 2 = 0]"
assert (
xpath("e:nth-child(2n+1 of li.important)") == "e[count(preceding-sibling::li[@class"
" and contains(concat(' ', normalize-space(@class), ' '), ' important ')])"
" mod 2 = 0]"
)
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("div:has(bar.foo)") == "div[descendant::bar"
"[@class and contains(concat(' ', normalize-space(@class), ' '), ' foo ')]]"
)
assert xpath("e:has(> f)") == "e[./f]"
assert xpath("e:has(f)") == "e[descendant::f]"
assert xpath("e:has(~ f)") == "e[following-sibling::f]"
assert (
xpath("e:has(+ f)") == "e[following-sibling::*[(name() = 'f') and (position() = 1)]]"
)
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("e ~ f:nth-child(3 of S)") == (
"e/following-sibling::f[count(preceding-sibling::S) = 2]"
)
assert xpath("div#container p") == ("div[@id = 'container']/descendant-or-self::*/p")
assert xpath("e:where(foo)") == "e[name() = 'foo']"
assert xpath("e:where(foo, bar)") == "e[(name() = 'foo') or (name() = 'bar')]"
# Invalid characters in XPath element names
assert xpath(r"di\a0 v") == ("*[name() = 'di v']") # di\xa0v
assert xpath(r"di\[v") == ("*[name() = 'di[v']")
assert xpath(r"[h\a0 ref]") == ("*[attribute::*[name() = 'h ref']]") # h\xa0ref
assert xpath(r"[h\]ref]") == ("*[attribute::*[name() = 'h]ref']]")
self.assertRaises(ExpressionError, xpath, ":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(TypeError, GenericTranslator().css_to_xpath, 4)
self.assertRaises(TypeError, GenericTranslator().selector_to_xpath, "foo")
def test_unicode(self) -> None:
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) -> None:
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) -> None:
# \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) -> None:
class CustomTranslator(GenericTranslator):
def xpath_pseudo_element(
self, xpath: XPathExpr, pseudo_element: PseudoElement
) -> XPathExpr:
if isinstance(pseudo_element, FunctionalPseudoElement):
method_name = "xpath_%s_functional_pseudo_element" % (
pseudo_element.name.replace("-", "_")
)
method = getattr(self, method_name, None)
if not method:
raise ExpressionError(
"The functional pseudo-element ::%s() is unknown" % pseudo_element.name
)
xpath = method(xpath, pseudo_element.arguments)
else:
method_name = "xpath_%s_simple_pseudo_element" % (
pseudo_element.replace("-", "_")
)
method = getattr(self, method_name, 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: XPathExpr, function: Function) -> XPathExpr:
assert function.arguments[0].value
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: XPathExpr) -> XPathExpr:
return xpath.add_condition("count(@*)=5")
# functional pseudo-element:
# element's attribute by name
def xpath_attr_functional_pseudo_element(
self, xpath: XPathExpr, arguments: Sequence[Token]
) -> XPathExpr:
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: XPathExpr) -> XPathExpr:
other = XPathExpr(
"text()",
"",
)
return xpath.join("/", other)
# pseudo-element:
# element's href attribute
def xpath_attr_href_simple_pseudo_element(self, xpath: XPathExpr) -> XPathExpr:
other = XPathExpr(
"@href",
"",
)
return xpath.join("/", other)
# pseudo-element:
# used to demonstrate operator precedence
def xpath_first_or_second_pseudo(self, xpath: XPathExpr) -> XPathExpr:
return xpath.add_condition("@id = 'first' or @id = 'second'")
def xpath(css: str) -> str:
return str(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.iter())).__getitem__
def operator_id(selector: str) -> List[str]:
xpath = CustomTranslator().css_to_xpath(selector)
items = typing.cast(List["etree._Element"], 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) -> None:
def series(css: str) -> Optional[Tuple[int, int]]:
(selector,) = parse(":nth-child(%s)" % css)
args = typing.cast(FunctionalPseudoElement, 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) -> None:
document = etree.fromstring(XMLLANG_IDS)
sort_key = dict((el, count) for count, el in enumerate(document.iter())).__getitem__
css_to_xpath = GenericTranslator().css_to_xpath
def langid(selector: str) -> List[str]:
xpath = css_to_xpath(selector)
items = typing.cast(List["etree._Element"], 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_argument_types(self) -> None:
class CustomTranslator(GenericTranslator):
def __init__(self) -> None:
self.argument_types: List[str] = []
def xpath_pseudo_element(
self, xpath: XPathExpr, pseudo_element: PseudoElement
) -> XPathExpr:
self.argument_types += typing.cast(
FunctionalPseudoElement, pseudo_element
).argument_types()
return xpath
def argument_types(css: str) -> List[str]:
translator = CustomTranslator()
translator.css_to_xpath(css)
return translator.argument_types
mappings: List[Tuple[str, List[str]]] = [
("", []),
("ident", ["IDENT"]),
('"string"', ["STRING"]),
("1", ["NUMBER"]),
]
for argument_string, argument_list in mappings:
css = f"::pseudo_element({argument_string})"
assert argument_types(css) == argument_list
def test_select(self) -> None:
document = etree.fromstring(HTML_IDS)
sort_key = dict((el, count) for count, el in enumerate(document.iter())).__getitem__
css_to_xpath = GenericTranslator().css_to_xpath
html_css_to_xpath = HTMLTranslator().css_to_xpath
def select_ids(selector: str, html_only: bool) -> List[str]:
xpath = css_to_xpath(selector)
items = typing.cast(List["etree._Element"], document.xpath(xpath))
if html_only:
assert items == []
xpath = html_css_to_xpath(selector)
items = typing.cast(List["etree._Element"], document.xpath(xpath))
items.sort(key=sort_key)
return [element.get("id", "nil") for element in items]
def pcss(main: str, *selectors: str, **kwargs: bool) -> List[str]:
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("link:has(*)") == []
assert pcss("ol:has(div)") == ["first-ol"]
assert pcss(":is(#first-li, #second-li)") == ["first-li", "second-li"]
assert pcss("a:is(#name-anchor, #tag-anchor)") == ["name-anchor", "tag-anchor"]
assert pcss(":is(.c)") == ["first-ol", "third-li", "fourth-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) -> None:
document = html.document_fromstring(HTML_SHAKESPEARE)
body = typing.cast(List["etree._Element"], document.xpath("//body"))[0]
css_to_xpath = GenericTranslator().css_to_xpath
basestring_ = (str, bytes)
def count(selector: str) -> int:
xpath = css_to_xpath(selector)
results = typing.cast(List["etree._Element"], 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)