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[utils] Use a regexp instead of HTMLParser for get_element_by_attribute
This commit is contained in:
Philipp Hagemeister
parent
11fba1751d
commit
3828505646
1 changed files with 15 additions and 104 deletions
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@ -152,86 +152,6 @@ def xpath_text(node, xpath, name=None, fatal=False):
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return n.text
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if sys.version_info < (2, 7):
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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
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class BaseHTMLParser(compat_html_parser.HTMLParser):
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def __init(self):
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compat_html_parser.HTMLParser.__init__(self)
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self.html = None
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def loads(self, html):
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self.html = html
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self.feed(html)
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self.close()
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class AttrParser(BaseHTMLParser):
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"""Modified HTMLParser that isolates a tag with the specified attribute"""
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def __init__(self, attribute, value):
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self.attribute = attribute
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self.value = value
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self.result = None
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self.started = False
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self.depth = {}
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self.watch_startpos = False
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self.error_count = 0
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BaseHTMLParser.__init__(self)
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def error(self, message):
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if self.error_count > 10 or self.started:
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raise compat_html_parser.HTMLParseError(message, self.getpos())
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self.rawdata = '\n'.join(self.html.split('\n')[self.getpos()[0]:]) # skip one line
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self.error_count += 1
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self.goahead(1)
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def handle_starttag(self, tag, attrs):
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attrs = dict(attrs)
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if self.started:
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self.find_startpos(None)
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if self.attribute in attrs and attrs[self.attribute] == self.value:
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self.result = [tag]
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self.started = True
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self.watch_startpos = True
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if self.started:
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if not tag in self.depth: self.depth[tag] = 0
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self.depth[tag] += 1
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def handle_endtag(self, tag):
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if self.started:
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if tag in self.depth: self.depth[tag] -= 1
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if self.depth[self.result[0]] == 0:
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self.started = False
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self.result.append(self.getpos())
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def find_startpos(self, x):
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"""Needed to put the start position of the result (self.result[1])
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after the opening tag with the requested id"""
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if self.watch_startpos:
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self.watch_startpos = False
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self.result.append(self.getpos())
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handle_entityref = handle_charref = handle_data = handle_comment = \
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handle_decl = handle_pi = unknown_decl = find_startpos
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def get_result(self):
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if self.result is None:
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return None
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if len(self.result) != 3:
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return None
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lines = self.html.split('\n')
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lines = lines[self.result[1][0]-1:self.result[2][0]]
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lines[0] = lines[0][self.result[1][1]:]
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if len(lines) == 1:
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lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
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lines[-1] = lines[-1][:self.result[2][1]]
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return '\n'.join(lines).strip()
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# Hack for https://github.com/rg3/youtube-dl/issues/662
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if sys.version_info < (2, 7, 3):
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AttrParser.parse_endtag = (lambda self, i:
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i + len("</scr'+'ipt>")
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if self.rawdata[i:].startswith("</scr'+'ipt>")
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else compat_html_parser.HTMLParser.parse_endtag(self, i))
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def get_element_by_id(id, html):
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"""Return the content of the tag with the specified ID in the passed HTML document"""
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return get_element_by_attribute("id", id, html)
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@ -239,34 +159,25 @@ def get_element_by_id(id, html):
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def get_element_by_attribute(attribute, value, html):
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"""Return the content of the tag with the specified attribute in the passed HTML document"""
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parser = AttrParser(attribute, value)
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try:
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parser.loads(html)
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except compat_html_parser.HTMLParseError:
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pass
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return parser.get_result()
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class MetaParser(BaseHTMLParser):
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"""
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Modified HTMLParser that isolates a meta tag with the specified name
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attribute.
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"""
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def __init__(self, name):
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BaseHTMLParser.__init__(self)
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self.name = name
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self.content = None
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self.result = None
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m = re.search(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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(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]+|="[^"]+"|='[^']+'))*?
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\s*>
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(?P<content>.*?)
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</\1>
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''' % (re.escape(attribute), re.escape(value)), html)
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def handle_starttag(self, tag, attrs):
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if tag != 'meta':
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return
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attrs = dict(attrs)
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if attrs.get('name') == self.name:
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self.result = attrs.get('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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def get_result(self):
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return self.result
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if res.startswith('"') or res.startswith("'"):
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res = res[1:-1]
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return unescapeHTML(res)
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def clean_html(html):
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