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Merge pull request #8092 from bpfoley/twitter-thumbnail
[utils] Add extract_attributes for extracting html tag attributes
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commit
83548824c2
@ -28,6 +28,7 @@ from youtube_dl.utils import (
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encodeFilename,
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escape_rfc3986,
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escape_url,
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extract_attributes,
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ExtractorError,
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find_xpath_attr,
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fix_xml_ampersands,
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@ -77,6 +78,7 @@ from youtube_dl.utils import (
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cli_bool_option,
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)
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from youtube_dl.compat import (
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compat_chr,
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compat_etree_fromstring,
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compat_urlparse,
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compat_parse_qs,
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@ -629,6 +631,44 @@ class TestUtil(unittest.TestCase):
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on = js_to_json('{"abc": "def",}')
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self.assertEqual(json.loads(on), {'abc': 'def'})
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def test_extract_attributes(self):
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self.assertEqual(extract_attributes('<e x="y">'), {'x': 'y'})
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self.assertEqual(extract_attributes("<e x='y'>"), {'x': 'y'})
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self.assertEqual(extract_attributes('<e x=y>'), {'x': 'y'})
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self.assertEqual(extract_attributes('<e x="a \'b\' c">'), {'x': "a 'b' c"})
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self.assertEqual(extract_attributes('<e x=\'a "b" c\'>'), {'x': 'a "b" c'})
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self.assertEqual(extract_attributes('<e x="y">'), {'x': 'y'})
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self.assertEqual(extract_attributes('<e x="y">'), {'x': 'y'})
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self.assertEqual(extract_attributes('<e x="&">'), {'x': '&'}) # XML
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self.assertEqual(extract_attributes('<e x=""">'), {'x': '"'})
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self.assertEqual(extract_attributes('<e x="£">'), {'x': '£'}) # HTML 3.2
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self.assertEqual(extract_attributes('<e x="λ">'), {'x': 'λ'}) # HTML 4.0
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self.assertEqual(extract_attributes('<e x="&foo">'), {'x': '&foo'})
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self.assertEqual(extract_attributes('<e x="\'">'), {'x': "'"})
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self.assertEqual(extract_attributes('<e x=\'"\'>'), {'x': '"'})
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self.assertEqual(extract_attributes('<e x >'), {'x': None})
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self.assertEqual(extract_attributes('<e x=y a>'), {'x': 'y', 'a': None})
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self.assertEqual(extract_attributes('<e x= y>'), {'x': 'y'})
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self.assertEqual(extract_attributes('<e x=1 y=2 x=3>'), {'y': '2', 'x': '3'})
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self.assertEqual(extract_attributes('<e \nx=\ny\n>'), {'x': 'y'})
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self.assertEqual(extract_attributes('<e \nx=\n"y"\n>'), {'x': 'y'})
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self.assertEqual(extract_attributes("<e \nx=\n'y'\n>"), {'x': 'y'})
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self.assertEqual(extract_attributes('<e \nx="\ny\n">'), {'x': '\ny\n'})
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self.assertEqual(extract_attributes('<e CAPS=x>'), {'caps': 'x'}) # Names lowercased
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self.assertEqual(extract_attributes('<e x=1 X=2>'), {'x': '2'})
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self.assertEqual(extract_attributes('<e X=1 x=2>'), {'x': '2'})
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self.assertEqual(extract_attributes('<e _:funny-name1=1>'), {'_:funny-name1': '1'})
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self.assertEqual(extract_attributes('<e x="Fáilte 世界 \U0001f600">'), {'x': 'Fáilte 世界 \U0001f600'})
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self.assertEqual(extract_attributes('<e x="décomposé">'), {'x': 'décompose\u0301'})
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# "Narrow" Python builds don't support unicode code points outside BMP.
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try:
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compat_chr(0x10000)
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supports_outside_bmp = True
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except ValueError:
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supports_outside_bmp = False
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if supports_outside_bmp:
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self.assertEqual(extract_attributes('<e x="Smile 😀!">'), {'x': 'Smile \U0001f600!'})
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def test_clean_html(self):
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self.assertEqual(clean_html('a:\nb'), 'a: b')
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self.assertEqual(clean_html('a:\n "b"'), 'a: "b"')
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@ -77,6 +77,11 @@ try:
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except ImportError: # Python 2
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from urllib import urlretrieve as compat_urlretrieve
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try:
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from html.parser import HTMLParser as compat_HTMLParser
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except ImportError: # Python 2
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from HTMLParser import HTMLParser as compat_HTMLParser
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try:
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from subprocess import DEVNULL
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@ -543,6 +548,7 @@ else:
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from tokenize import generate_tokens as compat_tokenize_tokenize
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__all__ = [
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'compat_HTMLParser',
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'compat_HTTPError',
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'compat_basestring',
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'compat_chr',
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@ -35,6 +35,7 @@ import xml.etree.ElementTree
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import zlib
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from .compat import (
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compat_HTMLParser,
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compat_basestring,
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compat_chr,
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compat_etree_fromstring,
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@ -272,6 +273,35 @@ def get_element_by_attribute(attribute, value, html):
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return unescapeHTML(res)
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class HTMLAttributeParser(compat_HTMLParser):
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"""Trivial HTML parser to gather the attributes for a single element"""
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def __init__(self):
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self.attrs = { }
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compat_HTMLParser.__init__(self)
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def handle_starttag(self, tag, attrs):
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self.attrs = dict(attrs)
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def extract_attributes(html_element):
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"""Given a string for an HTML element such as
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<el
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a="foo" B="bar" c="&98;az" d=boz
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empty= noval entity="&"
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sq='"' dq="'"
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>
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Decode and return a dictionary of attributes.
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{
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'a': 'foo', 'b': 'bar', c: 'baz', d: 'boz',
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'empty': '', 'noval': None, 'entity': '&',
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'sq': '"', 'dq': '\''
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}.
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NB HTMLParser is stricter in Python 2.6 & 3.2 than in later versions,
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but the cases in the unit test will work for all of 2.6, 2.7, 3.2-3.5.
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"""
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parser = HTMLAttributeParser()
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parser.feed(html_element)
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parser.close()
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return parser.attrs
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def clean_html(html):
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"""Clean an HTML snippet into a readable string"""
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