[utils] Use a regexp instead of HTMLParser for get_element_by_attribute

This commit is contained in:
Philipp Hagemeister 2014-11-04 23:33:43 +01:00
parent 11fba1751d
commit 3828505646

View file

@ -152,86 +152,6 @@ def xpath_text(node, xpath, name=None, fatal=False):
return n.text
if sys.version_info < (2, 7):
compat_html_parser.locatestarttagend = re.compile(r"""<[a-zA-Z][-.a-zA-Z0-9:_]*(?:\s+(?:(?<=['"\s])[^\s/>][^\s/=>]*(?:\s*=+\s*(?:'[^']*'|"[^"]*"|(?!['"])[^>\s]*))?\s*)*)?\s*""", re.VERBOSE) # backport bugfix
class BaseHTMLParser(compat_html_parser.HTMLParser):
def __init(self):
compat_html_parser.HTMLParser.__init__(self)
self.html = None
def loads(self, html):
self.html = html
self.feed(html)
self.close()
class AttrParser(BaseHTMLParser):
"""Modified HTMLParser that isolates a tag with the specified attribute"""
def __init__(self, attribute, value):
self.attribute = attribute
self.value = value
self.result = None
self.started = False
self.depth = {}
self.watch_startpos = False
self.error_count = 0
BaseHTMLParser.__init__(self)
def error(self, message):
if self.error_count > 10 or self.started:
raise compat_html_parser.HTMLParseError(message, self.getpos())
self.rawdata = '\n'.join(self.html.split('\n')[self.getpos()[0]:]) # skip one line
self.error_count += 1
self.goahead(1)
def handle_starttag(self, tag, attrs):
attrs = dict(attrs)
if self.started:
self.find_startpos(None)
if self.attribute in attrs and attrs[self.attribute] == self.value:
self.result = [tag]
self.started = True
self.watch_startpos = True
if self.started:
if not tag in self.depth: self.depth[tag] = 0
self.depth[tag] += 1
def handle_endtag(self, tag):
if self.started:
if tag in self.depth: self.depth[tag] -= 1
if self.depth[self.result[0]] == 0:
self.started = False
self.result.append(self.getpos())
def find_startpos(self, x):
"""Needed to put the start position of the result (self.result[1])
after the opening tag with the requested id"""
if self.watch_startpos:
self.watch_startpos = False
self.result.append(self.getpos())
handle_entityref = handle_charref = handle_data = handle_comment = \
handle_decl = handle_pi = unknown_decl = find_startpos
def get_result(self):
if self.result is None:
return None
if len(self.result) != 3:
return None
lines = self.html.split('\n')
lines = lines[self.result[1][0]-1:self.result[2][0]]
lines[0] = lines[0][self.result[1][1]:]
if len(lines) == 1:
lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
lines[-1] = lines[-1][:self.result[2][1]]
return '\n'.join(lines).strip()
# Hack for https://github.com/rg3/youtube-dl/issues/662
if sys.version_info < (2, 7, 3):
AttrParser.parse_endtag = (lambda self, i:
i + len("</scr'+'ipt>")
if self.rawdata[i:].startswith("</scr'+'ipt>")
else compat_html_parser.HTMLParser.parse_endtag(self, i))
def get_element_by_id(id, html):
"""Return the content of the tag with the specified ID in the passed HTML document"""
return get_element_by_attribute("id", id, html)
@ -239,34 +159,25 @@ def get_element_by_id(id, html):
def get_element_by_attribute(attribute, value, html):
"""Return the content of the tag with the specified attribute in the passed HTML document"""
parser = AttrParser(attribute, value)
try:
parser.loads(html)
except compat_html_parser.HTMLParseError:
pass
return parser.get_result()
class MetaParser(BaseHTMLParser):
"""
Modified HTMLParser that isolates a meta tag with the specified name
attribute.
"""
def __init__(self, name):
BaseHTMLParser.__init__(self)
self.name = name
self.content = None
self.result = None
m = re.search(r'''(?xs)
<([a-zA-Z0-9:._-]+)
(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]+|="[^"]+"|='[^']+'))*?
\s+%s=['"]?%s['"]?
(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]+|="[^"]+"|='[^']+'))*?
\s*>
(?P<content>.*?)
</\1>
''' % (re.escape(attribute), re.escape(value)), html)
def handle_starttag(self, tag, attrs):
if tag != 'meta':
return
attrs = dict(attrs)
if attrs.get('name') == self.name:
self.result = attrs.get('content')
if not m:
return None
res = m.group('content')
def get_result(self):
return self.result
if res.startswith('"') or res.startswith("'"):
res = res[1:-1]
return unescapeHTML(res)
def clean_html(html):