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"""Tests to ensure that the html5lib tree builder generates good trees."""
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import pytest
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import warnings
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from bs4 import BeautifulSoup
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from bs4.element import SoupStrainer
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from . import (
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HTML5LIB_PRESENT,
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HTML5TreeBuilderSmokeTest,
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SoupTest,
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)
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@pytest.mark.skipif(
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not HTML5LIB_PRESENT,
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reason="html5lib seems not to be present, not testing its tree builder."
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)
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class TestHTML5LibBuilder(SoupTest, HTML5TreeBuilderSmokeTest):
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"""See ``HTML5TreeBuilderSmokeTest``."""
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@property
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def default_builder(self):
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from bs4.builder import HTML5TreeBuilder
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return HTML5TreeBuilder
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def test_soupstrainer(self):
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# The html5lib tree builder does not support SoupStrainers.
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strainer = SoupStrainer("b")
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markup = "<p>A <b>bold</b> statement.</p>"
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with warnings.catch_warnings(record=True) as w:
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soup = BeautifulSoup(markup, "html5lib", parse_only=strainer)
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assert soup.decode() == self.document_for(markup)
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[warning] = w
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assert warning.filename == __file__
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assert "the html5lib tree builder doesn't support parse_only" in str(warning.message)
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def test_correctly_nested_tables(self):
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"""html5lib inserts <tbody> tags where other parsers don't."""
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markup = ('<table id="1">'
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'<tr>'
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"<td>Here's another table:"
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'<table id="2">'
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'<tr><td>foo</td></tr>'
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'</table></td>')
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self.assert_soup(
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markup,
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'<table id="1"><tbody><tr><td>Here\'s another table:'
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'<table id="2"><tbody><tr><td>foo</td></tr></tbody></table>'
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'</td></tr></tbody></table>')
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self.assert_soup(
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"<table><thead><tr><td>Foo</td></tr></thead>"
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"<tbody><tr><td>Bar</td></tr></tbody>"
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"<tfoot><tr><td>Baz</td></tr></tfoot></table>")
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def test_xml_declaration_followed_by_doctype(self):
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markup = '''<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html>
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<html>
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<head>
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</head>
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<body>
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<p>foo</p>
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</body>
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</html>'''
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soup = self.soup(markup)
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# Verify that we can reach the <p> tag; this means the tree is connected.
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assert b"<p>foo</p>" == soup.p.encode()
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def test_reparented_markup(self):
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markup = '<p><em>foo</p>\n<p>bar<a></a></em></p>'
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soup = self.soup(markup)
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assert "<body><p><em>foo</em></p><em>\n</em><p><em>bar<a></a></em></p></body>" == soup.body.decode()
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assert 2 == len(soup.find_all('p'))
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def test_reparented_markup_ends_with_whitespace(self):
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markup = '<p><em>foo</p>\n<p>bar<a></a></em></p>\n'
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soup = self.soup(markup)
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assert "<body><p><em>foo</em></p><em>\n</em><p><em>bar<a></a></em></p>\n</body>" == soup.body.decode()
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assert 2 == len(soup.find_all('p'))
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def test_reparented_markup_containing_identical_whitespace_nodes(self):
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"""Verify that we keep the two whitespace nodes in this
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document distinct when reparenting the adjacent <tbody> tags.
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"""
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markup = '<table> <tbody><tbody><ims></tbody> </table>'
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soup = self.soup(markup)
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space1, space2 = soup.find_all(string=' ')
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tbody1, tbody2 = soup.find_all('tbody')
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assert space1.next_element is tbody1
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assert tbody2.next_element is space2
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def test_reparented_markup_containing_children(self):
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markup = '<div><a>aftermath<p><noscript>target</noscript>aftermath</a></p></div>'
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soup = self.soup(markup)
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noscript = soup.noscript
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assert "target" == noscript.next_element
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target = soup.find(string='target')
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# The 'aftermath' string was duplicated; we want the second one.
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final_aftermath = soup.find_all(string='aftermath')[-1]
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# The <noscript> tag was moved beneath a copy of the <a> tag,
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# but the 'target' string within is still connected to the
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# (second) 'aftermath' string.
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assert final_aftermath == target.next_element
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assert target == final_aftermath.previous_element
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def test_processing_instruction(self):
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"""Processing instructions become comments."""
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markup = b"""<?PITarget PIContent?>"""
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soup = self.soup(markup)
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assert str(soup).startswith("<!--?PITarget PIContent?-->")
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def test_cloned_multivalue_node(self):
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markup = b"""<a class="my_class"><p></a>"""
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soup = self.soup(markup)
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a1, a2 = soup.find_all('a')
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assert a1 == a2
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assert a1 is not a2
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def test_foster_parenting(self):
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markup = b"""<table><td></tbody>A"""
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soup = self.soup(markup)
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assert "<body>A<table><tbody><tr><td></td></tr></tbody></table></body>" == soup.body.decode()
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def test_extraction(self):
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"""
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Test that extraction does not destroy the tree.
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https://bugs.launchpad.net/beautifulsoup/+bug/1782928
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"""
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markup = """
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<html><head></head>
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<style>
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</style><script></script><body><p>hello</p></body></html>
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"""
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soup = self.soup(markup)
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[s.extract() for s in soup('script')]
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[s.extract() for s in soup('style')]
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assert len(soup.find_all("p")) == 1
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def test_empty_comment(self):
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"""
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Test that empty comment does not break structure.
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https://bugs.launchpad.net/beautifulsoup/+bug/1806598
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"""
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markup = """
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<html>
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<body>
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<form>
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<!----><input type="text">
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</form>
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</body>
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</html>
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"""
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soup = self.soup(markup)
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inputs = []
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for form in soup.find_all('form'):
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inputs.extend(form.find_all('input'))
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assert len(inputs) == 1
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def test_tracking_line_numbers(self):
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# The html.parser TreeBuilder keeps track of line number and
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# position of each element.
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markup = "\n <p>\n\n<sourceline>\n<b>text</b></sourceline><sourcepos></p>"
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soup = self.soup(markup)
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assert 2 == soup.p.sourceline
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assert 5 == soup.p.sourcepos
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assert "sourceline" == soup.p.find('sourceline').name
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# You can deactivate this behavior.
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soup = self.soup(markup, store_line_numbers=False)
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assert "sourceline" == soup.p.sourceline.name
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assert "sourcepos" == soup.p.sourcepos.name
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def test_special_string_containers(self):
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# The html5lib tree builder doesn't support this standard feature,
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# because there's no way of knowing, when a string is created,
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# where in the tree it will eventually end up.
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pass
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def test_html5_attributes(self):
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# The html5lib TreeBuilder can convert any entity named in
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# the HTML5 spec to a sequence of Unicode characters, and
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# convert those Unicode characters to a (potentially
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# different) named entity on the way out.
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#
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# This is a copy of the same test from
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# HTMLParserTreeBuilderSmokeTest. It's not in the superclass
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# because the lxml HTML TreeBuilder _doesn't_ work this way.
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for input_element, output_unicode, output_element in (
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("⇄", '\u21c4', b'⇄'),
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('⊧', '\u22a7', b'⊧'),
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('𝔑', '\U0001d511', b'𝔑'),
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('≧̸', '\u2267\u0338', b'≧̸'),
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('¬', '\xac', b'¬'),
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('⫬', '\u2aec', b'⫬'),
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('"', '"', b'"'),
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('∴', '\u2234', b'∴'),
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('∴', '\u2234', b'∴'),
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('∴', '\u2234', b'∴'),
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("fj", 'fj', b'fj'),
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("⊔", '\u2294', b'⊔'),
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("⊔︀", '\u2294\ufe00', b'⊔︀'),
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("'", "'", b"'"),
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("|", "|", b"|"),
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):
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markup = '<div>%s</div>' % input_element
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div = self.soup(markup).div
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without_element = div.encode()
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expect = b"<div>%s</div>" % output_unicode.encode("utf8")
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assert without_element == expect
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with_element = div.encode(formatter="html")
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expect = b"<div>%s</div>" % output_element
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assert with_element == expect
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