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keshe/.venv/Lib/site-packages/bs4/tests/test_tree.py

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# -*- coding: utf-8 -*-
"""Tests for Beautiful Soup's tree traversal methods.
The tree traversal methods are the main advantage of using Beautiful
Soup over just using a parser.
Different parsers will build different Beautiful Soup trees given the
same markup, but all Beautiful Soup trees can be traversed with the
methods tested here.
"""
from pdb import set_trace
import pytest
import re
import warnings
from bs4 import BeautifulSoup
from bs4.builder import (
builder_registry,
HTMLParserTreeBuilder,
)
from bs4.element import (
CData,
Comment,
Declaration,
Doctype,
Formatter,
NavigableString,
Script,
SoupStrainer,
Stylesheet,
Tag,
TemplateString,
)
from . import (
SoupTest,
)
class TestFind(SoupTest):
"""Basic tests of the find() method.
find() just calls find_all() with limit=1, so it's not tested all
that thouroughly here.
"""
def test_find_tag(self):
soup = self.soup("<a>1</a><b>2</b><a>3</a><b>4</b>")
assert soup.find("b").string == "2"
def test_unicode_text_find(self):
soup = self.soup('<h1>Räksmörgås</h1>')
assert soup.find(string='Räksmörgås') == 'Räksmörgås'
def test_unicode_attribute_find(self):
soup = self.soup('<h1 id="Räksmörgås">here it is</h1>')
str(soup)
assert "here it is" == soup.find(id='Räksmörgås').text
def test_find_everything(self):
"""Test an optimization that finds all tags."""
soup = self.soup("<a>foo</a><b>bar</b>")
assert 2 == len(soup.find_all())
def test_find_everything_with_name(self):
"""Test an optimization that finds all tags with a given name."""
soup = self.soup("<a>foo</a><b>bar</b><a>baz</a>")
assert 2 == len(soup.find_all('a'))
class TestFindAll(SoupTest):
"""Basic tests of the find_all() method."""
def test_find_all_text_nodes(self):
"""You can search the tree for text nodes."""
soup = self.soup("<html>Foo<b>bar</b>\xbb</html>")
# Exact match.
assert soup.find_all(string="bar") == ["bar"]
# Match any of a number of strings.
assert soup.find_all(string=["Foo", "bar"]) == ["Foo", "bar"]
# Match a regular expression.
assert soup.find_all(string=re.compile('.*')) == ["Foo", "bar", '\xbb']
# Match anything.
assert soup.find_all(string=True) == ["Foo", "bar", '\xbb']
def test_find_all_limit(self):
"""You can limit the number of items returned by find_all."""
soup = self.soup("<a>1</a><a>2</a><a>3</a><a>4</a><a>5</a>")
self.assert_selects(soup.find_all('a', limit=3), ["1", "2", "3"])
self.assert_selects(soup.find_all('a', limit=1), ["1"])
self.assert_selects(
soup.find_all('a', limit=10), ["1", "2", "3", "4", "5"])
# A limit of 0 means no limit.
self.assert_selects(
soup.find_all('a', limit=0), ["1", "2", "3", "4", "5"])
def test_calling_a_tag_is_calling_findall(self):
soup = self.soup("<a>1</a><b>2<a id='foo'>3</a></b>")
self.assert_selects(soup('a', limit=1), ["1"])
self.assert_selects(soup.b(id="foo"), ["3"])
def test_find_all_with_self_referential_data_structure_does_not_cause_infinite_recursion(self):
soup = self.soup("<a></a>")
# Create a self-referential list.
l = []
l.append(l)
# Without special code in _normalize_search_value, this would cause infinite
# recursion.
assert [] == soup.find_all(l)
def test_find_all_resultset(self):
"""All find_all calls return a ResultSet"""
soup = self.soup("<a></a>")
result = soup.find_all("a")
assert hasattr(result, "source")
result = soup.find_all(True)
assert hasattr(result, "source")
result = soup.find_all(string="foo")
assert hasattr(result, "source")
class TestFindAllBasicNamespaces(SoupTest):
def test_find_by_namespaced_name(self):
soup = self.soup('<mathml:msqrt>4</mathml:msqrt><a svg:fill="red">')
assert "4" == soup.find("mathml:msqrt").string
assert "a" == soup.find(attrs= { "svg:fill" : "red" }).name
class TestFindAllByName(SoupTest):
"""Test ways of finding tags by tag name."""
def setup_method(self):
self.tree = self.soup("""<a>First tag.</a>
<b>Second tag.</b>
<c>Third <a>Nested tag.</a> tag.</c>""")
def test_find_all_by_tag_name(self):
# Find all the <a> tags.
self.assert_selects(
self.tree.find_all('a'), ['First tag.', 'Nested tag.'])
def test_find_all_by_name_and_text(self):
self.assert_selects(
self.tree.find_all('a', string='First tag.'), ['First tag.'])
self.assert_selects(
self.tree.find_all('a', string=True), ['First tag.', 'Nested tag.'])
self.assert_selects(
self.tree.find_all('a', string=re.compile("tag")),
['First tag.', 'Nested tag.'])
def test_find_all_on_non_root_element(self):
# You can call find_all on any node, not just the root.
self.assert_selects(self.tree.c.find_all('a'), ['Nested tag.'])
def test_calling_element_invokes_find_all(self):
self.assert_selects(self.tree('a'), ['First tag.', 'Nested tag.'])
def test_find_all_by_tag_strainer(self):
self.assert_selects(
self.tree.find_all(SoupStrainer('a')),
['First tag.', 'Nested tag.'])
def test_find_all_by_tag_names(self):
self.assert_selects(
self.tree.find_all(['a', 'b']),
['First tag.', 'Second tag.', 'Nested tag.'])
def test_find_all_by_tag_dict(self):
self.assert_selects(
self.tree.find_all({'a' : True, 'b' : True}),
['First tag.', 'Second tag.', 'Nested tag.'])
def test_find_all_by_tag_re(self):
self.assert_selects(
self.tree.find_all(re.compile('^[ab]$')),
['First tag.', 'Second tag.', 'Nested tag.'])
def test_find_all_with_tags_matching_method(self):
# You can define an oracle method that determines whether
# a tag matches the search.
def id_matches_name(tag):
return tag.name == tag.get('id')
tree = self.soup("""<a id="a">Match 1.</a>
<a id="1">Does not match.</a>
<b id="b">Match 2.</a>""")
self.assert_selects(
tree.find_all(id_matches_name), ["Match 1.", "Match 2."])
def test_find_with_multi_valued_attribute(self):
soup = self.soup(
"<div class='a b'>1</div><div class='a c'>2</div><div class='a d'>3</div>"
)
r1 = soup.find('div', 'a d');
r2 = soup.find('div', re.compile(r'a d'));
r3, r4 = soup.find_all('div', ['a b', 'a d']);
assert '3' == r1.string
assert '3' == r2.string
assert '1' == r3.string
assert '3' == r4.string
class TestFindAllByAttribute(SoupTest):
def test_find_all_by_attribute_name(self):
# You can pass in keyword arguments to find_all to search by
# attribute.
tree = self.soup("""
<a id="first">Matching a.</a>
<a id="second">
Non-matching <b id="first">Matching b.</b>a.
</a>""")
self.assert_selects(tree.find_all(id='first'),
["Matching a.", "Matching b."])
def test_find_all_by_utf8_attribute_value(self):
peace = "םולש".encode("utf8")
data = '<a title="םולש"></a>'.encode("utf8")
soup = self.soup(data)
assert [soup.a] == soup.find_all(title=peace)
assert [soup.a] == soup.find_all(title=peace.decode("utf8"))
assert [soup.a], soup.find_all(title=[peace, "something else"])
def test_find_all_by_attribute_dict(self):
# You can pass in a dictionary as the argument 'attrs'. This
# lets you search for attributes like 'name' (a fixed argument
# to find_all) and 'class' (a reserved word in Python.)
tree = self.soup("""
<a name="name1" class="class1">Name match.</a>
<a name="name2" class="class2">Class match.</a>
<a name="name3" class="class3">Non-match.</a>
<name1>A tag called 'name1'.</name1>
""")
# This doesn't do what you want.
self.assert_selects(tree.find_all(name='name1'),
["A tag called 'name1'."])
# This does what you want.
self.assert_selects(tree.find_all(attrs={'name' : 'name1'}),
["Name match."])
self.assert_selects(tree.find_all(attrs={'class' : 'class2'}),
["Class match."])
def test_find_all_by_class(self):
tree = self.soup("""
<a class="1">Class 1.</a>
<a class="2">Class 2.</a>
<b class="1">Class 1.</b>
<c class="3 4">Class 3 and 4.</c>
""")
# Passing in the class_ keyword argument will search against
# the 'class' attribute.
self.assert_selects(tree.find_all('a', class_='1'), ['Class 1.'])
self.assert_selects(tree.find_all('c', class_='3'), ['Class 3 and 4.'])
self.assert_selects(tree.find_all('c', class_='4'), ['Class 3 and 4.'])
# Passing in a string to 'attrs' will also search the CSS class.
self.assert_selects(tree.find_all('a', '1'), ['Class 1.'])
self.assert_selects(tree.find_all(attrs='1'), ['Class 1.', 'Class 1.'])
self.assert_selects(tree.find_all('c', '3'), ['Class 3 and 4.'])
self.assert_selects(tree.find_all('c', '4'), ['Class 3 and 4.'])
def test_find_by_class_when_multiple_classes_present(self):
tree = self.soup("<gar class='foo bar'>Found it</gar>")
f = tree.find_all("gar", class_=re.compile("o"))
self.assert_selects(f, ["Found it"])
f = tree.find_all("gar", class_=re.compile("a"))
self.assert_selects(f, ["Found it"])
# If the search fails to match the individual strings "foo" and "bar",
# it will be tried against the combined string "foo bar".
f = tree.find_all("gar", class_=re.compile("o b"))
self.assert_selects(f, ["Found it"])
def test_find_all_with_non_dictionary_for_attrs_finds_by_class(self):
soup = self.soup("<a class='bar'>Found it</a>")
self.assert_selects(soup.find_all("a", re.compile("ba")), ["Found it"])
def big_attribute_value(value):
return len(value) > 3
self.assert_selects(soup.find_all("a", big_attribute_value), [])
def small_attribute_value(value):
return len(value) <= 3
self.assert_selects(
soup.find_all("a", small_attribute_value), ["Found it"])
def test_find_all_with_string_for_attrs_finds_multiple_classes(self):
soup = self.soup('<a class="foo bar"></a><a class="foo"></a>')
a, a2 = soup.find_all("a")
assert [a, a2], soup.find_all("a", "foo")
assert [a], soup.find_all("a", "bar")
# If you specify the class as a string that contains a
# space, only that specific value will be found.
assert [a] == soup.find_all("a", class_="foo bar")
assert [a] == soup.find_all("a", "foo bar")
assert [] == soup.find_all("a", "bar foo")
def test_find_all_by_attribute_soupstrainer(self):
tree = self.soup("""
<a id="first">Match.</a>
<a id="second">Non-match.</a>""")
strainer = SoupStrainer(attrs={'id' : 'first'})
self.assert_selects(tree.find_all(strainer), ['Match.'])
def test_find_all_with_missing_attribute(self):
# You can pass in None as the value of an attribute to find_all.
# This will match tags that do not have that attribute set.
tree = self.soup("""<a id="1">ID present.</a>
<a>No ID present.</a>
<a id="">ID is empty.</a>""")
self.assert_selects(tree.find_all('a', id=None), ["No ID present."])
def test_find_all_with_defined_attribute(self):
# You can pass in None as the value of an attribute to find_all.
# This will match tags that have that attribute set to any value.
tree = self.soup("""<a id="1">ID present.</a>
<a>No ID present.</a>
<a id="">ID is empty.</a>""")
self.assert_selects(
tree.find_all(id=True), ["ID present.", "ID is empty."])
def test_find_all_with_numeric_attribute(self):
# If you search for a number, it's treated as a string.
tree = self.soup("""<a id=1>Unquoted attribute.</a>
<a id="1">Quoted attribute.</a>""")
expected = ["Unquoted attribute.", "Quoted attribute."]
self.assert_selects(tree.find_all(id=1), expected)
self.assert_selects(tree.find_all(id="1"), expected)
def test_find_all_with_list_attribute_values(self):
# You can pass a list of attribute values instead of just one,
# and you'll get tags that match any of the values.
tree = self.soup("""<a id="1">1</a>
<a id="2">2</a>
<a id="3">3</a>
<a>No ID.</a>""")
self.assert_selects(tree.find_all(id=["1", "3", "4"]),
["1", "3"])
def test_find_all_with_regular_expression_attribute_value(self):
# You can pass a regular expression as an attribute value, and
# you'll get tags whose values for that attribute match the
# regular expression.
tree = self.soup("""<a id="a">One a.</a>
<a id="aa">Two as.</a>
<a id="ab">Mixed as and bs.</a>
<a id="b">One b.</a>
<a>No ID.</a>""")
self.assert_selects(tree.find_all(id=re.compile("^a+$")),
["One a.", "Two as."])
def test_find_by_name_and_containing_string(self):
soup = self.soup("<b>foo</b><b>bar</b><a>foo</a>")
a = soup.a
assert [a] == soup.find_all("a", string="foo")
assert [] == soup.find_all("a", string="bar")
def test_find_by_name_and_containing_string_when_string_is_buried(self):
soup = self.soup("<a>foo</a><a><b><c>foo</c></b></a>")
assert soup.find_all("a") == soup.find_all("a", string="foo")
def test_find_by_attribute_and_containing_string(self):
soup = self.soup('<b id="1">foo</b><a id="2">foo</a>')
a = soup.a
assert [a] == soup.find_all(id=2, string="foo")
assert [] == soup.find_all(id=1, string="bar")
class TestSmooth(SoupTest):
"""Test Tag.smooth."""
def test_smooth(self):
soup = self.soup("<div>a</div>")
div = soup.div
div.append("b")
div.append("c")
div.append(Comment("Comment 1"))
div.append(Comment("Comment 2"))
div.append("d")
builder = self.default_builder()
span = Tag(soup, builder, 'span')
span.append('1')
span.append('2')
div.append(span)
# At this point the tree has a bunch of adjacent
# NavigableStrings. This is normal, but it has no meaning in
# terms of HTML, so we may want to smooth things out for
# output.
# Since the <span> tag has two children, its .string is None.
assert None == div.span.string
assert 7 == len(div.contents)
div.smooth()
assert 5 == len(div.contents)
# The three strings at the beginning of div.contents have been
# merged into on string.
#
assert 'abc' == div.contents[0]
# The call is recursive -- the <span> tag was also smoothed.
assert '12' == div.span.string
# The two comments have _not_ been merged, even though
# comments are strings. Merging comments would change the
# meaning of the HTML.
assert 'Comment 1' == div.contents[1]
assert 'Comment 2' == div.contents[2]
class TestIndex(SoupTest):
"""Test Tag.index"""
def test_index(self):
tree = self.soup("""<div>
<a>Identical</a>
<b>Not identical</b>
<a>Identical</a>
<c><d>Identical with child</d></c>
<b>Also not identical</b>
<c><d>Identical with child</d></c>
</div>""")
div = tree.div
for i, element in enumerate(div.contents):
assert i == div.index(element)
with pytest.raises(ValueError):
tree.index(1)
class TestParentOperations(SoupTest):
"""Test navigation and searching through an element's parents."""
def setup_method(self):
self.tree = self.soup('''<ul id="empty"></ul>
<ul id="top">
<ul id="middle">
<ul id="bottom">
<b>Start here</b>
</ul>
</ul>''')
self.start = self.tree.b
def test_parent(self):
assert self.start.parent['id'] == 'bottom'
assert self.start.parent.parent['id'] == 'middle'
assert self.start.parent.parent.parent['id'] == 'top'
def test_parent_of_top_tag_is_soup_object(self):
top_tag = self.tree.contents[0]
assert top_tag.parent == self.tree
def test_soup_object_has_no_parent(self):
assert None == self.tree.parent
def test_find_parents(self):
self.assert_selects_ids(
self.start.find_parents('ul'), ['bottom', 'middle', 'top'])
self.assert_selects_ids(
self.start.find_parents('ul', id="middle"), ['middle'])
def test_find_parent(self):
assert self.start.find_parent('ul')['id'] == 'bottom'
assert self.start.find_parent('ul', id='top')['id'] == 'top'
def test_parent_of_text_element(self):
text = self.tree.find(string="Start here")
assert text.parent.name == 'b'
def test_text_element_find_parent(self):
text = self.tree.find(string="Start here")
assert text.find_parent('ul')['id'] == 'bottom'
def test_parent_generator(self):
parents = [parent['id'] for parent in self.start.parents
if parent is not None and 'id' in parent.attrs]
assert parents, ['bottom', 'middle' == 'top']
class ProximityTest(SoupTest):
def setup_method(self):
self.tree = self.soup(
'<html id="start"><head></head><body><b id="1">One</b><b id="2">Two</b><b id="3">Three</b></body></html>')
class TestNextOperations(ProximityTest):
def setup_method(self):
super(TestNextOperations, self).setup_method()
self.start = self.tree.b
def test_next(self):
assert self.start.next_element == "One"
assert self.start.next_element.next_element['id'] == "2"
def test_next_of_last_item_is_none(self):
last = self.tree.find(string="Three")
assert last.next_element == None
def test_next_of_root_is_none(self):
# The document root is outside the next/previous chain.
assert self.tree.next_element == None
def test_find_all_next(self):
self.assert_selects(self.start.find_all_next('b'), ["Two", "Three"])
self.start.find_all_next(id=3)
self.assert_selects(self.start.find_all_next(id=3), ["Three"])
def test_find_next(self):
assert self.start.find_next('b')['id'] == '2'
assert self.start.find_next(string="Three") == "Three"
def test_find_next_for_text_element(self):
text = self.tree.find(string="One")
assert text.find_next("b").string == "Two"
self.assert_selects(text.find_all_next("b"), ["Two", "Three"])
def test_next_generator(self):
start = self.tree.find(string="Two")
successors = [node for node in start.next_elements]
# There are two successors: the final <b> tag and its text contents.
tag, contents = successors
assert tag['id'] == '3'
assert contents == "Three"
class TestPreviousOperations(ProximityTest):
def setup_method(self):
super(TestPreviousOperations, self).setup_method()
self.end = self.tree.find(string="Three")
def test_previous(self):
assert self.end.previous_element['id'] == "3"
assert self.end.previous_element.previous_element == "Two"
def test_previous_of_first_item_is_none(self):
first = self.tree.find('html')
assert first.previous_element == None
def test_previous_of_root_is_none(self):
# The document root is outside the next/previous chain.
assert self.tree.previous_element == None
def test_find_all_previous(self):
# The <b> tag containing the "Three" node is the predecessor
# of the "Three" node itself, which is why "Three" shows up
# here.
self.assert_selects(
self.end.find_all_previous('b'), ["Three", "Two", "One"])
self.assert_selects(self.end.find_all_previous(id=1), ["One"])
def test_find_previous(self):
assert self.end.find_previous('b')['id'] == '3'
assert self.end.find_previous(string="One") == "One"
def test_find_previous_for_text_element(self):
text = self.tree.find(string="Three")
assert text.find_previous("b").string == "Three"
self.assert_selects(
text.find_all_previous("b"), ["Three", "Two", "One"])
def test_previous_generator(self):
start = self.tree.find(string="One")
predecessors = [node for node in start.previous_elements]
# There are four predecessors: the <b> tag containing "One"
# the <body> tag, the <head> tag, and the <html> tag.
b, body, head, html = predecessors
assert b['id'] == '1'
assert body.name == "body"
assert head.name == "head"
assert html.name == "html"
class SiblingTest(SoupTest):
def setup_method(self):
markup = '''<html>
<span id="1">
<span id="1.1"></span>
</span>
<span id="2">
<span id="2.1"></span>
</span>
<span id="3">
<span id="3.1"></span>
</span>
<span id="4"></span>
</html>'''
# All that whitespace looks good but makes the tests more
# difficult. Get rid of it.
markup = re.compile(r"\n\s*").sub("", markup)
self.tree = self.soup(markup)
class TestNextSibling(SiblingTest):
def setup_method(self):
super(TestNextSibling, self).setup_method()
self.start = self.tree.find(id="1")
def test_next_sibling_of_root_is_none(self):
assert self.tree.next_sibling == None
def test_next_sibling(self):
assert self.start.next_sibling['id'] == '2'
assert self.start.next_sibling.next_sibling['id'] == '3'
# Note the difference between next_sibling and next_element.
assert self.start.next_element['id'] == '1.1'
def test_next_sibling_may_not_exist(self):
assert self.tree.html.next_sibling == None
nested_span = self.tree.find(id="1.1")
assert nested_span.next_sibling == None
last_span = self.tree.find(id="4")
assert last_span.next_sibling == None
def test_find_next_sibling(self):
assert self.start.find_next_sibling('span')['id'] == '2'
def test_next_siblings(self):
self.assert_selects_ids(self.start.find_next_siblings("span"),
['2', '3', '4'])
self.assert_selects_ids(self.start.find_next_siblings(id='3'), ['3'])
def test_next_sibling_for_text_element(self):
soup = self.soup("Foo<b>bar</b>baz")
start = soup.find(string="Foo")
assert start.next_sibling.name == 'b'
assert start.next_sibling.next_sibling == 'baz'
self.assert_selects(start.find_next_siblings('b'), ['bar'])
assert start.find_next_sibling(string="baz") == "baz"
assert start.find_next_sibling(string="nonesuch") == None
class TestPreviousSibling(SiblingTest):
def setup_method(self):
super(TestPreviousSibling, self).setup_method()
self.end = self.tree.find(id="4")
def test_previous_sibling_of_root_is_none(self):
assert self.tree.previous_sibling == None
def test_previous_sibling(self):
assert self.end.previous_sibling['id'] == '3'
assert self.end.previous_sibling.previous_sibling['id'] == '2'
# Note the difference between previous_sibling and previous_element.
assert self.end.previous_element['id'] == '3.1'
def test_previous_sibling_may_not_exist(self):
assert self.tree.html.previous_sibling == None
nested_span = self.tree.find(id="1.1")
assert nested_span.previous_sibling == None
first_span = self.tree.find(id="1")
assert first_span.previous_sibling == None
def test_find_previous_sibling(self):
assert self.end.find_previous_sibling('span')['id'] == '3'
def test_previous_siblings(self):
self.assert_selects_ids(self.end.find_previous_siblings("span"),
['3', '2', '1'])
self.assert_selects_ids(self.end.find_previous_siblings(id='1'), ['1'])
def test_previous_sibling_for_text_element(self):
soup = self.soup("Foo<b>bar</b>baz")
start = soup.find(string="baz")
assert start.previous_sibling.name == 'b'
assert start.previous_sibling.previous_sibling == 'Foo'
self.assert_selects(start.find_previous_siblings('b'), ['bar'])
assert start.find_previous_sibling(string="Foo") == "Foo"
assert start.find_previous_sibling(string="nonesuch") == None
class TestTreeModification(SoupTest):
def test_attribute_modification(self):
soup = self.soup('<a id="1"></a>')
soup.a['id'] = 2
assert soup.decode() == self.document_for('<a id="2"></a>')
del(soup.a['id'])
assert soup.decode() == self.document_for('<a></a>')
soup.a['id2'] = 'foo'
assert soup.decode() == self.document_for('<a id2="foo"></a>')
def test_new_tag_creation(self):
builder = builder_registry.lookup('html')()
soup = self.soup("<body></body>", builder=builder)
a = Tag(soup, builder, 'a')
ol = Tag(soup, builder, 'ol')
a['href'] = 'http://foo.com/'
soup.body.insert(0, a)
soup.body.insert(1, ol)
assert soup.body.encode() == b'<body><a href="http://foo.com/"></a><ol></ol></body>'
def test_append_to_contents_moves_tag(self):
doc = """<p id="1">Don't leave me <b>here</b>.</p>
<p id="2">Don\'t leave!</p>"""
soup = self.soup(doc)
second_para = soup.find(id='2')
bold = soup.b
# Move the <b> tag to the end of the second paragraph.
soup.find(id='2').append(soup.b)
# The <b> tag is now a child of the second paragraph.
assert bold.parent == second_para
assert soup.decode() == self.document_for(
'<p id="1">Don\'t leave me .</p>\n'
'<p id="2">Don\'t leave!<b>here</b></p>'
)
def test_replace_with_returns_thing_that_was_replaced(self):
text = "<a></a><b><c></c></b>"
soup = self.soup(text)
a = soup.a
new_a = a.replace_with(soup.c)
assert a == new_a
def test_unwrap_returns_thing_that_was_replaced(self):
text = "<a><b></b><c></c></a>"
soup = self.soup(text)
a = soup.a
new_a = a.unwrap()
assert a == new_a
def test_replace_with_and_unwrap_give_useful_exception_when_tag_has_no_parent(self):
soup = self.soup("<a><b>Foo</b></a><c>Bar</c>")
a = soup.a
a.extract()
assert None == a.parent
with pytest.raises(ValueError):
a.unwrap()
with pytest.raises(ValueError):
a.replace_with(soup.c)
def test_replace_tag_with_itself(self):
text = "<a><b></b><c>Foo<d></d></c></a><a><e></e></a>"
soup = self.soup(text)
c = soup.c
soup.c.replace_with(c)
assert soup.decode() == self.document_for(text)
def test_replace_tag_with_its_parent_raises_exception(self):
text = "<a><b></b></a>"
soup = self.soup(text)
with pytest.raises(ValueError):
soup.b.replace_with(soup.a)
def test_insert_tag_into_itself_raises_exception(self):
text = "<a><b></b></a>"
soup = self.soup(text)
with pytest.raises(ValueError):
soup.a.insert(0, soup.a)
def test_insert_beautifulsoup_object_inserts_children(self):
"""Inserting one BeautifulSoup object into another actually inserts all
of its children -- you'll never combine BeautifulSoup objects.
"""
soup = self.soup("<p>And now, a word:</p><p>And we're back.</p>")
text = "<p>p2</p><p>p3</p>"
to_insert = self.soup(text)
soup.insert(1, to_insert)
for i in soup.descendants:
assert not isinstance(i, BeautifulSoup)
p1, p2, p3, p4 = list(soup.children)
assert "And now, a word:" == p1.string
assert "p2" == p2.string
assert "p3" == p3.string
assert "And we're back." == p4.string
def test_replace_with_maintains_next_element_throughout(self):
soup = self.soup('<p><a>one</a><b>three</b></p>')
a = soup.a
b = a.contents[0]
# Make it so the <a> tag has two text children.
a.insert(1, "two")
# Now replace each one with the empty string.
left, right = a.contents
left.replaceWith('')
right.replaceWith('')
# The <b> tag is still connected to the tree.
assert "three" == soup.b.string
def test_replace_final_node(self):
soup = self.soup("<b>Argh!</b>")
soup.find(string="Argh!").replace_with("Hooray!")
new_text = soup.find(string="Hooray!")
b = soup.b
assert new_text.previous_element == b
assert new_text.parent == b
assert new_text.previous_element.next_element == new_text
assert new_text.next_element == None
def test_consecutive_text_nodes(self):
# A builder should never create two consecutive text nodes,
# but if you insert one next to another, Beautiful Soup will
# handle it correctly.
soup = self.soup("<a><b>Argh!</b><c></c></a>")
soup.b.insert(1, "Hooray!")
assert soup.decode() == self.document_for(
"<a><b>Argh!Hooray!</b><c></c></a>"
)
new_text = soup.find(string="Hooray!")
assert new_text.previous_element == "Argh!"
assert new_text.previous_element.next_element == new_text
assert new_text.previous_sibling == "Argh!"
assert new_text.previous_sibling.next_sibling == new_text
assert new_text.next_sibling == None
assert new_text.next_element == soup.c
def test_insert_string(self):
soup = self.soup("<a></a>")
soup.a.insert(0, "bar")
soup.a.insert(0, "foo")
# The string were added to the tag.
assert ["foo", "bar"] == soup.a.contents
# And they were converted to NavigableStrings.
assert soup.a.contents[0].next_element == "bar"
def test_insert_tag(self):
builder = self.default_builder()
soup = self.soup(
"<a><b>Find</b><c>lady!</c><d></d></a>", builder=builder)
magic_tag = Tag(soup, builder, 'magictag')
magic_tag.insert(0, "the")
soup.a.insert(1, magic_tag)
assert soup.decode() == self.document_for(
"<a><b>Find</b><magictag>the</magictag><c>lady!</c><d></d></a>"
)
# Make sure all the relationships are hooked up correctly.
b_tag = soup.b
assert b_tag.next_sibling == magic_tag
assert magic_tag.previous_sibling == b_tag
find = b_tag.find(string="Find")
assert find.next_element == magic_tag
assert magic_tag.previous_element == find
c_tag = soup.c
assert magic_tag.next_sibling == c_tag
assert c_tag.previous_sibling == magic_tag
the = magic_tag.find(string="the")
assert the.parent == magic_tag
assert the.next_element == c_tag
assert c_tag.previous_element == the
def test_append_child_thats_already_at_the_end(self):
data = "<a><b></b></a>"
soup = self.soup(data)
soup.a.append(soup.b)
assert data == soup.decode()
def test_extend(self):
data = "<a><b><c><d><e><f><g></g></f></e></d></c></b></a>"
soup = self.soup(data)
l = [soup.g, soup.f, soup.e, soup.d, soup.c, soup.b]
soup.a.extend(l)
assert "<a><g></g><f></f><e></e><d></d><c></c><b></b></a>" == soup.decode()
@pytest.mark.parametrize(
"get_tags", [lambda tag: tag, lambda tag: tag.contents]
)
def test_extend_with_another_tags_contents(self, get_tags):
data = '<body><div id="d1"><a>1</a><a>2</a><a>3</a><a>4</a></div><div id="d2"></div></body>'
soup = self.soup(data)
d1 = soup.find('div', id='d1')
d2 = soup.find('div', id='d2')
tags = get_tags(d1)
d2.extend(tags)
assert '<div id="d1"></div>' == d1.decode()
assert '<div id="d2"><a>1</a><a>2</a><a>3</a><a>4</a></div>' == d2.decode()
def test_move_tag_to_beginning_of_parent(self):
data = "<a><b></b><c></c><d></d></a>"
soup = self.soup(data)
soup.a.insert(0, soup.d)
assert "<a><d></d><b></b><c></c></a>" == soup.decode()
def test_insert_works_on_empty_element_tag(self):
# This is a little strange, since most HTML parsers don't allow
# markup like this to come through. But in general, we don't
# know what the parser would or wouldn't have allowed, so
# I'm letting this succeed for now.
soup = self.soup("<br/>")
soup.br.insert(1, "Contents")
assert str(soup.br) == "<br>Contents</br>"
def test_insert_before(self):
soup = self.soup("<a>foo</a><b>bar</b>")
soup.b.insert_before("BAZ")
soup.a.insert_before("QUUX")
assert soup.decode() == self.document_for(
"QUUX<a>foo</a>BAZ<b>bar</b>"
)
soup.a.insert_before(soup.b)
assert soup.decode() == self.document_for("QUUX<b>bar</b><a>foo</a>BAZ")
# Can't insert an element before itself.
b = soup.b
with pytest.raises(ValueError):
b.insert_before(b)
# Can't insert before if an element has no parent.
b.extract()
with pytest.raises(ValueError):
b.insert_before("nope")
# Can insert an identical element
soup = self.soup("<a>")
soup.a.insert_before(soup.new_tag("a"))
# TODO: OK but what happens?
def test_insert_multiple_before(self):
soup = self.soup("<a>foo</a><b>bar</b>")
soup.b.insert_before("BAZ", " ", "QUUX")
soup.a.insert_before("QUUX", " ", "BAZ")
assert soup.decode() == self.document_for(
"QUUX BAZ<a>foo</a>BAZ QUUX<b>bar</b>"
)
soup.a.insert_before(soup.b, "FOO")
assert soup.decode() == self.document_for(
"QUUX BAZ<b>bar</b>FOO<a>foo</a>BAZ QUUX"
)
def test_insert_after(self):
soup = self.soup("<a>foo</a><b>bar</b>")
soup.b.insert_after("BAZ")
soup.a.insert_after("QUUX")
assert soup.decode() == self.document_for(
"<a>foo</a>QUUX<b>bar</b>BAZ"
)
soup.b.insert_after(soup.a)
assert soup.decode() == self.document_for("QUUX<b>bar</b><a>foo</a>BAZ")
# Can't insert an element after itself.
b = soup.b
with pytest.raises(ValueError):
b.insert_after(b)
# Can't insert after if an element has no parent.
b.extract()
with pytest.raises(ValueError):
b.insert_after("nope")
# Can insert an identical element
soup = self.soup("<a>")
soup.a.insert_before(soup.new_tag("a"))
# TODO: OK but what does it look like?
def test_insert_multiple_after(self):
soup = self.soup("<a>foo</a><b>bar</b>")
soup.b.insert_after("BAZ", " ", "QUUX")
soup.a.insert_after("QUUX", " ", "BAZ")
assert soup.decode() == self.document_for(
"<a>foo</a>QUUX BAZ<b>bar</b>BAZ QUUX"
)
soup.b.insert_after(soup.a, "FOO ")
assert soup.decode() == self.document_for(
"QUUX BAZ<b>bar</b><a>foo</a>FOO BAZ QUUX"
)
def test_insert_after_raises_exception_if_after_has_no_meaning(self):
soup = self.soup("")
tag = soup.new_tag("a")
string = soup.new_string("")
with pytest.raises(ValueError):
string.insert_after(tag)
with pytest.raises(NotImplementedError):
soup.insert_after(tag)
with pytest.raises(ValueError):
tag.insert_after(tag)
def test_insert_before_raises_notimplementederror_if_before_has_no_meaning(self):
soup = self.soup("")
tag = soup.new_tag("a")
string = soup.new_string("")
with pytest.raises(ValueError):
string.insert_before(tag)
with pytest.raises(NotImplementedError):
soup.insert_before(tag)
with pytest.raises(ValueError):
tag.insert_before(tag)
def test_replace_with(self):
soup = self.soup(
"<p>There's <b>no</b> business like <b>show</b> business</p>")
no, show = soup.find_all('b')
show.replace_with(no)
assert soup.decode() == self.document_for(
"<p>There's business like <b>no</b> business</p>"
)
assert show.parent == None
assert no.parent == soup.p
assert no.next_element == "no"
assert no.next_sibling == " business"
def test_replace_with_errors(self):
# Can't replace a tag that's not part of a tree.
a_tag = Tag(name="a")
with pytest.raises(ValueError):
a_tag.replace_with("won't work")
# Can't replace a tag with its parent.
a_tag = self.soup("<a><b></b></a>").a
with pytest.raises(ValueError):
a_tag.b.replace_with(a_tag)
# Or with a list that includes its parent.
with pytest.raises(ValueError):
a_tag.b.replace_with("string1", a_tag, "string2")
def test_replace_with_multiple(self):
data = "<a><b></b><c></c></a>"
soup = self.soup(data)
d_tag = soup.new_tag("d")
d_tag.string = "Text In D Tag"
e_tag = soup.new_tag("e")
f_tag = soup.new_tag("f")
a_string = "Random Text"
soup.c.replace_with(d_tag, e_tag, a_string, f_tag)
assert soup.decode() == "<a><b></b><d>Text In D Tag</d><e></e>Random Text<f></f></a>"
assert soup.b.next_element == d_tag
assert d_tag.string.next_element==e_tag
assert e_tag.next_element.string == a_string
assert e_tag.next_element.next_element == f_tag
def test_replace_first_child(self):
data = "<a><b></b><c></c></a>"
soup = self.soup(data)
soup.b.replace_with(soup.c)
assert "<a><c></c></a>" == soup.decode()
def test_replace_last_child(self):
data = "<a><b></b><c></c></a>"
soup = self.soup(data)
soup.c.replace_with(soup.b)
assert "<a><b></b></a>" == soup.decode()
def test_nested_tag_replace_with(self):
soup = self.soup(
"""<a>We<b>reserve<c>the</c><d>right</d></b></a><e>to<f>refuse</f><g>service</g></e>""")
# Replace the entire <b> tag and its contents ("reserve the
# right") with the <f> tag ("refuse").
remove_tag = soup.b
move_tag = soup.f
remove_tag.replace_with(move_tag)
assert soup.decode() == self.document_for(
"<a>We<f>refuse</f></a><e>to<g>service</g></e>"
)
# The <b> tag is now an orphan.
assert remove_tag.parent == None
assert remove_tag.find(string="right").next_element == None
assert remove_tag.previous_element == None
assert remove_tag.next_sibling == None
assert remove_tag.previous_sibling == None
# The <f> tag is now connected to the <a> tag.
assert move_tag.parent == soup.a
assert move_tag.previous_element == "We"
assert move_tag.next_element.next_element == soup.e
assert move_tag.next_sibling == None
# The gap where the <f> tag used to be has been mended, and
# the word "to" is now connected to the <g> tag.
to_text = soup.find(string="to")
g_tag = soup.g
assert to_text.next_element == g_tag
assert to_text.next_sibling == g_tag
assert g_tag.previous_element == to_text
assert g_tag.previous_sibling == to_text
def test_unwrap(self):
tree = self.soup("""
<p>Unneeded <em>formatting</em> is unneeded</p>
""")
tree.em.unwrap()
assert tree.em == None
assert tree.p.text == "Unneeded formatting is unneeded"
def test_wrap(self):
soup = self.soup("I wish I was bold.")
value = soup.string.wrap(soup.new_tag("b"))
assert value.decode() == "<b>I wish I was bold.</b>"
assert soup.decode() == self.document_for("<b>I wish I was bold.</b>")
def test_wrap_extracts_tag_from_elsewhere(self):
soup = self.soup("<b></b>I wish I was bold.")
soup.b.next_sibling.wrap(soup.b)
assert soup.decode() == self.document_for("<b>I wish I was bold.</b>")
def test_wrap_puts_new_contents_at_the_end(self):
soup = self.soup("<b>I like being bold.</b>I wish I was bold.")
soup.b.next_sibling.wrap(soup.b)
assert 2 == len(soup.b.contents)
assert soup.decode() == self.document_for(
"<b>I like being bold.I wish I was bold.</b>"
)
def test_extract(self):
soup = self.soup(
'<html><body>Some content. <div id="nav">Nav crap</div> More content.</body></html>')
assert len(soup.body.contents) == 3
extracted = soup.find(id="nav").extract()
assert soup.decode() == "<html><body>Some content. More content.</body></html>"
assert extracted.decode() == '<div id="nav">Nav crap</div>'
# The extracted tag is now an orphan.
assert len(soup.body.contents) == 2
assert extracted.parent == None
assert extracted.previous_element == None
assert extracted.next_element.next_element == None
# The gap where the extracted tag used to be has been mended.
content_1 = soup.find(string="Some content. ")
content_2 = soup.find(string=" More content.")
assert content_1.next_element == content_2
assert content_1.next_sibling == content_2
assert content_2.previous_element == content_1
assert content_2.previous_sibling == content_1
def test_extract_distinguishes_between_identical_strings(self):
soup = self.soup("<a>foo</a><b>bar</b>")
foo_1 = soup.a.string
bar_1 = soup.b.string
foo_2 = soup.new_string("foo")
bar_2 = soup.new_string("bar")
soup.a.append(foo_2)
soup.b.append(bar_2)
# Now there are two identical strings in the <a> tag, and two
# in the <b> tag. Let's remove the first "foo" and the second
# "bar".
foo_1.extract()
bar_2.extract()
assert foo_2 == soup.a.string
assert bar_2 == soup.b.string
def test_extract_multiples_of_same_tag(self):
soup = self.soup("""
<html>
<head>
<script>foo</script>
</head>
<body>
<script>bar</script>
<a></a>
</body>
<script>baz</script>
</html>""")
[soup.script.extract() for i in soup.find_all("script")]
assert "<body>\n\n<a></a>\n</body>" == str(soup.body)
def test_extract_works_when_element_is_surrounded_by_identical_strings(self):
soup = self.soup(
'<html>\n'
'<body>hi</body>\n'
'</html>')
soup.find('body').extract()
assert None == soup.find('body')
def test_clear(self):
"""Tag.clear()"""
soup = self.soup("<p><a>String <em>Italicized</em></a> and another</p>")
# clear using extract()
a = soup.a
soup.p.clear()
assert len(soup.p.contents) == 0
assert hasattr(a, "contents")
# clear using decompose()
em = a.em
a.clear(decompose=True)
assert 0 == len(em.contents)
def test_decompose(self):
# Test PageElement.decompose() and PageElement.decomposed
soup = self.soup("<p><a>String <em>Italicized</em></a></p><p>Another para</p>")
p1, p2 = soup.find_all('p')
a = p1.a
text = p1.em.string
for i in [p1, p2, a, text]:
assert False == i.decomposed
# This sets p1 and everything beneath it to decomposed.
p1.decompose()
for i in [p1, a, text]:
assert True == i.decomposed
# p2 is unaffected.
assert False == p2.decomposed
def test_string_set(self):
"""Tag.string = 'string'"""
soup = self.soup("<a></a> <b><c></c></b>")
soup.a.string = "foo"
assert soup.a.contents == ["foo"]
soup.b.string = "bar"
assert soup.b.contents == ["bar"]
def test_string_set_does_not_affect_original_string(self):
soup = self.soup("<a><b>foo</b><c>bar</c>")
soup.b.string = soup.c.string
assert soup.a.encode() == b"<a><b>bar</b><c>bar</c></a>"
def test_set_string_preserves_class_of_string(self):
soup = self.soup("<a></a>")
cdata = CData("foo")
soup.a.string = cdata
assert isinstance(soup.a.string, CData)
class TestDeprecatedArguments(SoupTest):
@pytest.mark.parametrize(
"method_name", [
"find", "find_all", "find_parent", "find_parents",
"find_next", "find_all_next", "find_previous",
"find_all_previous", "find_next_sibling", "find_next_siblings",
"find_previous_sibling", "find_previous_siblings",
]
)
def test_find_type_method_string(self, method_name):
soup = self.soup("<a>some</a><b>markup</b>")
method = getattr(soup.b, method_name)
with warnings.catch_warnings(record=True) as w:
method(text='markup')
[warning] = w
assert warning.filename == __file__
msg = str(warning.message)
assert msg == "The 'text' argument to find()-type methods is deprecated. Use 'string' instead."
def test_soupstrainer_constructor_string(self):
with warnings.catch_warnings(record=True) as w:
strainer = SoupStrainer(text="text")
assert strainer.text == 'text'
[warning] = w
msg = str(warning.message)
assert warning.filename == __file__
assert msg == "The 'text' argument to the SoupStrainer constructor is deprecated. Use 'string' instead."