mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-28 10:38:26 +00:00
258 lines
9.2 KiB
Python
258 lines
9.2 KiB
Python
# Use of this source code is governed by a BSD-style license that can be
|
|
# found in the LICENSE file.
|
|
__all__ = [
|
|
'LXMLTreeBuilderForXML',
|
|
'LXMLTreeBuilder',
|
|
]
|
|
|
|
from io import BytesIO
|
|
from StringIO import StringIO
|
|
import collections
|
|
from lxml import etree
|
|
from bs4.element import (
|
|
Comment,
|
|
Doctype,
|
|
NamespacedAttribute,
|
|
ProcessingInstruction,
|
|
XMLProcessingInstruction,
|
|
)
|
|
from bs4.builder import (
|
|
FAST,
|
|
HTML,
|
|
HTMLTreeBuilder,
|
|
PERMISSIVE,
|
|
ParserRejectedMarkup,
|
|
TreeBuilder,
|
|
XML)
|
|
from bs4.dammit import EncodingDetector
|
|
|
|
LXML = 'lxml'
|
|
|
|
class LXMLTreeBuilderForXML(TreeBuilder):
|
|
DEFAULT_PARSER_CLASS = etree.XMLParser
|
|
|
|
is_xml = True
|
|
processing_instruction_class = XMLProcessingInstruction
|
|
|
|
NAME = "lxml-xml"
|
|
ALTERNATE_NAMES = ["xml"]
|
|
|
|
# Well, it's permissive by XML parser standards.
|
|
features = [NAME, LXML, XML, FAST, PERMISSIVE]
|
|
|
|
CHUNK_SIZE = 512
|
|
|
|
# This namespace mapping is specified in the XML Namespace
|
|
# standard.
|
|
DEFAULT_NSMAPS = {'http://www.w3.org/XML/1998/namespace' : "xml"}
|
|
|
|
def default_parser(self, encoding):
|
|
# This can either return a parser object or a class, which
|
|
# will be instantiated with default arguments.
|
|
if self._default_parser is not None:
|
|
return self._default_parser
|
|
return etree.XMLParser(
|
|
target=self, strip_cdata=False, recover=True, encoding=encoding)
|
|
|
|
def parser_for(self, encoding):
|
|
# Use the default parser.
|
|
parser = self.default_parser(encoding)
|
|
|
|
if isinstance(parser, collections.Callable):
|
|
# Instantiate the parser with default arguments
|
|
parser = parser(target=self, strip_cdata=False, encoding=encoding)
|
|
return parser
|
|
|
|
def __init__(self, parser=None, empty_element_tags=None):
|
|
# TODO: Issue a warning if parser is present but not a
|
|
# callable, since that means there's no way to create new
|
|
# parsers for different encodings.
|
|
self._default_parser = parser
|
|
if empty_element_tags is not None:
|
|
self.empty_element_tags = set(empty_element_tags)
|
|
self.soup = None
|
|
self.nsmaps = [self.DEFAULT_NSMAPS]
|
|
|
|
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,
|
|
exclude_encodings=None,
|
|
document_declared_encoding=None):
|
|
"""
|
|
:yield: A series of 4-tuples.
|
|
(markup, encoding, declared encoding,
|
|
has undergone character replacement)
|
|
|
|
Each 4-tuple represents a strategy for parsing the document.
|
|
"""
|
|
# Instead of using UnicodeDammit to convert the bytestring to
|
|
# Unicode using different encodings, use EncodingDetector to
|
|
# iterate over the encodings, and tell lxml to try to parse
|
|
# the document as each one in turn.
|
|
is_html = not self.is_xml
|
|
if is_html:
|
|
self.processing_instruction_class = ProcessingInstruction
|
|
else:
|
|
self.processing_instruction_class = XMLProcessingInstruction
|
|
|
|
if isinstance(markup, unicode):
|
|
# We were given Unicode. Maybe lxml can parse Unicode on
|
|
# this system?
|
|
yield markup, None, document_declared_encoding, False
|
|
|
|
if isinstance(markup, unicode):
|
|
# No, apparently not. Convert the Unicode to UTF-8 and
|
|
# tell lxml to parse it as UTF-8.
|
|
yield (markup.encode("utf8"), "utf8",
|
|
document_declared_encoding, False)
|
|
|
|
try_encodings = [user_specified_encoding, document_declared_encoding]
|
|
detector = EncodingDetector(
|
|
markup, try_encodings, is_html, exclude_encodings)
|
|
for encoding in detector.encodings:
|
|
yield (detector.markup, encoding, document_declared_encoding, False)
|
|
|
|
def feed(self, markup):
|
|
if isinstance(markup, bytes):
|
|
markup = BytesIO(markup)
|
|
elif isinstance(markup, unicode):
|
|
markup = StringIO(markup)
|
|
|
|
# Call feed() at least once, even if the markup is empty,
|
|
# or the parser won't be initialized.
|
|
data = markup.read(self.CHUNK_SIZE)
|
|
try:
|
|
self.parser = self.parser_for(self.soup.original_encoding)
|
|
self.parser.feed(data)
|
|
while len(data) != 0:
|
|
# Now call feed() on the rest of the data, chunk by chunk.
|
|
data = markup.read(self.CHUNK_SIZE)
|
|
if len(data) != 0:
|
|
self.parser.feed(data)
|
|
self.parser.close()
|
|
except (UnicodeDecodeError, LookupError, etree.ParserError), e:
|
|
raise ParserRejectedMarkup(str(e))
|
|
|
|
def close(self):
|
|
self.nsmaps = [self.DEFAULT_NSMAPS]
|
|
|
|
def start(self, name, attrs, nsmap={}):
|
|
# Make sure attrs is a mutable dict--lxml may send an immutable dictproxy.
|
|
attrs = dict(attrs)
|
|
nsprefix = None
|
|
# Invert each namespace map as it comes in.
|
|
if len(self.nsmaps) > 1:
|
|
# There are no new namespaces for this tag, but
|
|
# non-default namespaces are in play, so we need a
|
|
# separate tag stack to know when they end.
|
|
self.nsmaps.append(None)
|
|
elif len(nsmap) > 0:
|
|
# A new namespace mapping has come into play.
|
|
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
|
|
|
|
# Namespaces are in play. Find any attributes that came in
|
|
# from lxml with namespaces attached to their names, and
|
|
# turn then into NamespacedAttribute objects.
|
|
new_attrs = {}
|
|
for attr, value in attrs.items():
|
|
namespace, attr = self._getNsTag(attr)
|
|
if namespace is None:
|
|
new_attrs[attr] = value
|
|
else:
|
|
nsprefix = self._prefix_for_namespace(namespace)
|
|
attr = NamespacedAttribute(nsprefix, attr, namespace)
|
|
new_attrs[attr] = value
|
|
attrs = new_attrs
|
|
|
|
namespace, name = self._getNsTag(name)
|
|
nsprefix = self._prefix_for_namespace(namespace)
|
|
self.soup.handle_starttag(name, namespace, nsprefix, attrs)
|
|
|
|
def _prefix_for_namespace(self, namespace):
|
|
"""Find the currently active prefix for the given namespace."""
|
|
if namespace is None:
|
|
return None
|
|
for inverted_nsmap in reversed(self.nsmaps):
|
|
if inverted_nsmap is not None and namespace in inverted_nsmap:
|
|
return inverted_nsmap[namespace]
|
|
return None
|
|
|
|
def end(self, name):
|
|
self.soup.endData()
|
|
completed_tag = self.soup.tagStack[-1]
|
|
namespace, name = self._getNsTag(name)
|
|
nsprefix = None
|
|
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_endtag(name, nsprefix)
|
|
if len(self.nsmaps) > 1:
|
|
# This tag, or one of its parents, introduced a namespace
|
|
# mapping, so pop it off the stack.
|
|
self.nsmaps.pop()
|
|
|
|
def pi(self, target, data):
|
|
self.soup.endData()
|
|
self.soup.handle_data(target + ' ' + data)
|
|
self.soup.endData(self.processing_instruction_class)
|
|
|
|
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):
|
|
|
|
NAME = LXML
|
|
ALTERNATE_NAMES = ["lxml-html"]
|
|
|
|
features = ALTERNATE_NAMES + [NAME, HTML, FAST, PERMISSIVE]
|
|
is_xml = False
|
|
processing_instruction_class = ProcessingInstruction
|
|
|
|
def default_parser(self, encoding):
|
|
return etree.HTMLParser
|
|
|
|
def feed(self, markup):
|
|
encoding = self.soup.original_encoding
|
|
try:
|
|
self.parser = self.parser_for(encoding)
|
|
self.parser.feed(markup)
|
|
self.parser.close()
|
|
except (UnicodeDecodeError, LookupError, etree.ParserError), e:
|
|
raise ParserRejectedMarkup(str(e))
|
|
|
|
|
|
def test_fragment_to_document(self, fragment):
|
|
"""See `TreeBuilder`."""
|
|
return u'<html><body>%s</body></html>' % fragment
|