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Introduce get_elements_by_class and get_elements_by_attribute utility functions
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@ -34,6 +34,9 @@ from youtube_dl.utils import (
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find_xpath_attr,
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fix_xml_ampersands,
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get_element_by_class,
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get_element_by_attribute,
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get_elements_by_class,
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get_elements_by_attribute,
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InAdvancePagedList,
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intlist_to_bytes,
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is_html,
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@ -1124,6 +1127,32 @@ The first line
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self.assertEqual(get_element_by_class('foo', html), 'nice')
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self.assertEqual(get_element_by_class('no-such-class', html), None)
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def test_get_element_by_attribute(self):
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html = '''
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<span class="foo bar">nice</span>
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'''
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self.assertEqual(get_element_by_attribute('class', 'foo bar', html), 'nice')
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self.assertEqual(get_element_by_attribute('class', 'foo', html), None)
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self.assertEqual(get_element_by_attribute('class', 'no-such-foo', html), None)
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def test_get_elements_by_class(self):
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html = '''
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<span class="foo bar">nice</span><span class="foo bar">also nice</span>
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'''
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self.assertEqual(get_elements_by_class('foo', html), ['nice', 'also nice'])
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self.assertEqual(get_elements_by_class('no-such-class', html), [])
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def test_get_elements_by_attribute(self):
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html = '''
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<span class="foo bar">nice</span><span class="foo bar">also nice</span>
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'''
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self.assertEqual(get_elements_by_attribute('class', 'foo bar', html), ['nice', 'also nice'])
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self.assertEqual(get_elements_by_attribute('class', 'foo', html), [])
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self.assertEqual(get_elements_by_attribute('class', 'no-such-foo', html), [])
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if __name__ == '__main__':
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unittest.main()
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@ -337,17 +337,30 @@ def get_element_by_id(id, html):
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def get_element_by_class(class_name, html):
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return get_element_by_attribute(
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"""Return the content of the first tag with the specified class in the passed HTML document"""
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retval = get_elements_by_class(class_name, html)
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return retval[0] if retval else None
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def get_element_by_attribute(attribute, value, html, escape_value=True):
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retval = get_elements_by_attribute(attribute, value, html, escape_value)
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return retval[0] if retval else None
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def get_elements_by_class(class_name, html):
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"""Return the content of all tags with the specified class in the passed HTML document as a list"""
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return get_elements_by_attribute(
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'class', r'[^\'"]*\b%s\b[^\'"]*' % re.escape(class_name),
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html, escape_value=False)
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def get_element_by_attribute(attribute, value, html, escape_value=True):
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def get_elements_by_attribute(attribute, value, html, escape_value=True):
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"""Return the content of the tag with the specified attribute in the passed HTML document"""
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value = re.escape(value) if escape_value else value
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m = re.search(r'''(?xs)
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retlist = []
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for m in re.finditer(r'''(?xs)
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<([a-zA-Z0-9:._-]+)
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(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]*|="[^"]*"|='[^']*'))*?
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\s+%s=['"]?%s['"]?
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@ -355,16 +368,15 @@ def get_element_by_attribute(attribute, value, html, escape_value=True):
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\s*>
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(?P<content>.*?)
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</\1>
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''' % (re.escape(attribute), value), html)
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''' % (re.escape(attribute), value), html):
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res = m.group('content')
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if not m:
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return None
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res = m.group('content')
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if res.startswith('"') or res.startswith("'"):
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res = res[1:-1]
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if res.startswith('"') or res.startswith("'"):
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res = res[1:-1]
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retlist.append(unescapeHTML(res))
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return unescapeHTML(res)
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return retlist
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class HTMLAttributeParser(compat_HTMLParser):
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