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__all__ = [
'LXMLTreeBuilderForXML',
'LXMLTreeBuilder',
]
import collections
from lxml import etree
from bs4.element import Comment, Doctype, NamespacedAttribute
from bs4.builder import (
FAST,
HTML,
HTMLTreeBuilder,
PERMISSIVE,
TreeBuilder,
XML)
from bs4.dammit import UnicodeDammit
LXML = 'lxml'
class LXMLTreeBuilderForXML(TreeBuilder):
DEFAULT_PARSER_CLASS = etree.XMLParser
is_xml = True
# Well, it's permissive by XML parser standards.
features = [LXML, XML, FAST, PERMISSIVE]
@property
def default_parser(self):
# This can either return a parser object or a class, which
# will be instantiated with default arguments.
return etree.XMLParser(target=self, strip_cdata=False, recover=True)
def __init__(self, parser=None, empty_element_tags=None):
if empty_element_tags is not None:
self.empty_element_tags = set(empty_element_tags)
if parser is None:
# Use the default parser.
parser = self.default_parser
if isinstance(parser, collections.Callable):
# Instantiate the parser with default arguments
parser = parser(target=self, strip_cdata=False)
self.parser = parser
self.soup = None
self.nsmaps = None
def _getNsTag(self, tag):
# Split the namespace URL out of a fully-qualified lxml tag
# name. Copied from lxml's src/lxml/sax.py.
if tag[0] == '{':
return tuple(tag[1:].split('}', 1))
else:
return (None, tag)
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, False
try_encodings = [user_specified_encoding, document_declared_encoding]
dammit = UnicodeDammit(markup, try_encodings, is_html=True)
return (dammit.markup, dammit.original_encoding,
dammit.declared_html_encoding,
dammit.contains_replacement_characters)
def feed(self, markup):
self.parser.feed(markup)
self.parser.close()
def close(self):
self.namespaces.clear()
def start(self, name, attrs, nsmap={}):
nsprefix = None
# Invert each namespace map as it comes in.
if len(nsmap) == 0 and self.nsmaps != None:
# There are namespaces in play, so we need to keep track
# of when they start and end
self.nsmaps.append(None)
elif len(nsmap) > 0:
# A new namespace mapping has come into play.
if self.nsmaps is None:
self.nsmaps = []
inverted_nsmap = dict((value, key) for key, value in nsmap.items())
self.nsmaps.append(inverted_nsmap)
# Also treat the namespace mapping as a set of attributes on the
# tag, so we can recreate it later.
attrs = attrs.copy()
for prefix, namespace in nsmap.items():
attribute = NamespacedAttribute(
"xmlns", prefix, "http://www.w3.org/2000/xmlns/")
attrs[attribute] = namespace
namespace, name = self._getNsTag(name)
if namespace is not None:
for inverted_nsmap in reversed(self.nsmaps):
if inverted_nsmap is not None and namespace in inverted_nsmap:
nsprefix = inverted_nsmap[namespace]
break
self.soup.handle_starttag(name, namespace, nsprefix, attrs)
def end(self, name):
self.soup.endData()
completed_tag = self.soup.tagStack[-1]
self.soup.handle_endtag(name)
if self.nsmaps != None:
self.nsmaps.pop()
if len(self.nsmaps) == 0:
self.nsmaps = None
def pi(self, target, data):
pass
def data(self, content):
self.soup.handle_data(content)
def doctype(self, name, pubid, system):
self.soup.endData()
doctype = Doctype.for_name_and_ids(name, pubid, system)
self.soup.object_was_parsed(doctype)
def comment(self, content):
"Handle comments as Comment objects."
self.soup.endData()
self.soup.handle_data(content)
self.soup.endData(Comment)
def test_fragment_to_document(self, fragment):
"""See `TreeBuilder`."""
return u'<?xml version="1.0" encoding="utf-8">\n%s' % fragment
class LXMLTreeBuilder(HTMLTreeBuilder, LXMLTreeBuilderForXML):
features = [LXML, HTML, FAST, PERMISSIVE]
is_xml = False
@property
def default_parser(self):
return etree.HTMLParser
def test_fragment_to_document(self, fragment):
"""See `TreeBuilder`."""
return u'<html><body>%s</body></html>' % fragment
|
