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Introduce get_elements_by_class and get_elements_by_attribute utility functions

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This commit is contained in:
Thomas Christlieb 2017-02-11 10:16:54 +01:00 committed by Sergey M
parent 97eb9bd2ac
commit 2af12ad9d2
2 changed files with 51 additions and 10 deletions
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29
test/test_utils.py
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@ -34,6 +34,9 @@
find_xpath_attr,
fix_xml_ampersands,
get_element_by_class,
get_element_by_attribute,
get_elements_by_class,
get_elements_by_attribute,
InAdvancePagedList,
intlist_to_bytes,
is_html,
@ -1124,6 +1127,32 @@ def test_get_element_by_class(self):
self.assertEqual(get_element_by_class('foo', html), 'nice')
self.assertEqual(get_element_by_class('no-such-class', html), None)
def test_get_element_by_attribute(self):
html = '''
<span class="foo bar">nice</span>
'''
self.assertEqual(get_element_by_attribute('class', 'foo bar', html), 'nice')
self.assertEqual(get_element_by_attribute('class', 'foo', html), None)
self.assertEqual(get_element_by_attribute('class', 'no-such-foo', html), None)
def test_get_elements_by_class(self):
html = '''
<span class="foo bar">nice</span><span class="foo bar">also nice</span>
'''
self.assertEqual(get_elements_by_class('foo', html), ['nice', 'also nice'])
self.assertEqual(get_elements_by_class('no-such-class', html), [])
def test_get_elements_by_attribute(self):
html = '''
<span class="foo bar">nice</span><span class="foo bar">also nice</span>
'''
self.assertEqual(get_elements_by_attribute('class', 'foo bar', html), ['nice', 'also nice'])
self.assertEqual(get_elements_by_attribute('class', 'foo', html), [])
self.assertEqual(get_elements_by_attribute('class', 'no-such-foo', html), [])
if __name__ == '__main__':
unittest.main()

32
youtube_dl/utils.py
View File

@ -337,17 +337,30 @@ def get_element_by_id(id, html):
def get_element_by_class(class_name, html):
return get_element_by_attribute(
"""Return the content of the first tag with the specified class in the passed HTML document"""
retval = get_elements_by_class(class_name, html)
return retval[0] if retval else None
def get_element_by_attribute(attribute, value, html, escape_value=True):
retval = get_elements_by_attribute(attribute, value, html, escape_value)
return retval[0] if retval else None
def get_elements_by_class(class_name, html):
"""Return the content of all tags with the specified class in the passed HTML document as a list"""
return get_elements_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):
def get_elements_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)
retlist = []
for m in re.finditer(r'''(?xs)
<([a-zA-Z0-9:._-]+)
(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]*|="[^"]*"|='[^']*'))*?
\s+%s=['"]?%s['"]?
@ -355,16 +368,15 @@ def get_element_by_attribute(attribute, value, html, escape_value=True):
\s*>
(?P<content>.*?)
</\1>
''' % (re.escape(attribute), value), html)
''' % (re.escape(attribute), value), html):
res = m.group('content')
if not m:
return None
res = m.group('content')
if res.startswith('"') or res.startswith("'"):
res = res[1:-1]
if res.startswith('"') or res.startswith("'"):
res = res[1:-1]
retlist.append(unescapeHTML(res))
return unescapeHTML(res)
return retlist
class HTMLAttributeParser(compat_HTMLParser):