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[utils] Add get_element_by_class

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For #9950
This commit is contained in:
Yen Chi Hsuan 2016-07-06 20:02:52 +08:00
parent ab49d7a9fa
commit 84c237fb8a
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2 changed files with 19 additions and 2 deletions
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9
test/test_utils.py
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@ -33,6 +33,7 @@ from youtube_dl.utils import (
ExtractorError,
find_xpath_attr,
fix_xml_ampersands,
get_element_by_class,
InAdvancePagedList,
intlist_to_bytes,
is_html,
@ -991,5 +992,13 @@ The first line
self.assertEqual(urshift(3, 1), 1)
self.assertEqual(urshift(-3, 1), 2147483646)
def test_get_element_by_class(self):
html = '''
<span class="foo bar">nice</span>
'''
self.assertEqual(get_element_by_class('foo', html), 'nice')
self.assertEqual(get_element_by_class('no-such-class', html), None)
if __name__ == '__main__':
unittest.main()

12
youtube_dl/utils.py
View File

@ -310,9 +310,17 @@ def get_element_by_id(id, html):
return get_element_by_attribute('id', id, html)
def get_element_by_attribute(attribute, value, html):
def get_element_by_class(class_name, html):
return get_element_by_attribute(
'class', r'[^\'"]*\b%s\b[^\'"]*' % re.escape(class_name),
html, escape_value=False)
def get_element_by_attribute(attribute, value, html, escape_value=True):
"""Return the content of the tag with the specified attribute in the passed HTML document"""
value = re.escape(value) if escape_value else value
m = re.search(r'''(?xs)
<([a-zA-Z0-9:._-]+)
(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]*|="[^"]*"|='[^']*'))*?
@ -321,7 +329,7 @@ def get_element_by_attribute(attribute, value, html):
\s*>
(?P<content>.*?)
</\1>
''' % (re.escape(attribute), re.escape(value)), html)
''' % (re.escape(attribute), value), html)
if not m:
return None