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"""Use the HTMLParser library to parse HTML files that aren't too bad."""
__all__ = [
'HTMLParserTreeBuilder',
]
try:
from html.parser import HTMLParser
CONSTRUCTOR_TAKES_STRICT = True
except ImportError, e:
from HTMLParser import HTMLParser
CONSTRUCTOR_TAKES_STRICT = False
from bs4.element import (
CData,
Comment,
Declaration,
Doctype,
ProcessingInstruction,
)
from bs4.dammit import EntitySubstitution, UnicodeDammit
from bs4.builder import (
HTML,
HTMLTreeBuilder,
STRICT,
)
HTMLPARSER = 'html.parser'
class HTMLParserTreeBuilder(HTMLParser, HTMLTreeBuilder):
is_xml = False
features = [HTML, STRICT, HTMLPARSER]
def __init__(self, *args, **kwargs):
if CONSTRUCTOR_TAKES_STRICT:
kwargs['strict'] = True
return super(HTMLParserTreeBuilder, self).__init__(*args, **kwargs)
def prepare_markup(self, markup, user_specified_encoding=None,
document_declared_encoding=None):
"""
:return: A 3-tuple (markup, original encoding, encoding
declared within markup).
"""
if isinstance(markup, unicode):
return markup, None, None
try_encodings = [user_specified_encoding, document_declared_encoding]
dammit = UnicodeDammit(markup, try_encodings, isHTML=True)
return (dammit.markup, dammit.original_encoding,
dammit.declared_html_encoding)
def feed(self, markup):
super(HTMLParserTreeBuilder, self).feed(markup)
def handle_starttag(self, name, attrs):
self.soup.handle_starttag(name, dict(attrs))
def handle_endtag(self, name):
self.soup.handle_endtag(name)
def handle_data(self, data):
self.soup.handle_data(data)
def handle_charref(self, name):
self.handle_data(unichr(int(name)))
def handle_entityref(self, name):
character = EntitySubstitution.HTML_ENTITY_TO_CHARACTER.get(name)
if character is not None:
data = character
else:
data = "&%s;" % name
self.handle_data(data)
def handle_comment(self, data):
self.soup.endData()
self.soup.handle_data(data)
self.soup.endData(Comment)
def handle_decl(self, data):
self.soup.endData()
if data.startswith("DOCTYPE "):
data = data[len("DOCTYPE "):]
self.soup.handle_data(data)
self.soup.endData(Doctype)
def unknown_decl(self, data):
if data.upper().startswith('CDATA['):
cls = CData
data = data[len('CDATA['):]
else:
cls = Declaration
self.soup.endData()
self.soup.handle_data(data)
self.soup.endData(cls)
def handle_pi(self, data):
self.soup.endData()
self.soup.handle_data(data)
self.soup.endData(ProcessingInstruction)
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