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Current File : /proc/3/cwd/srv/radicale/env/lib64/python3.5/site-packages/defusedxml/ElementTree.py
# defusedxml
#
# Copyright (c) 2013 by Christian Heimes <christian@python.org>
# Licensed to PSF under a Contributor Agreement.
# See https://www.python.org/psf/license for licensing details.
"""Defused xml.etree.ElementTree facade
"""
from __future__ import print_function, absolute_import

import sys
import warnings
from xml.etree.ElementTree import TreeBuilder as _TreeBuilder
from xml.etree.ElementTree import parse as _parse
from xml.etree.ElementTree import tostring

from .common import PY3

if PY3:
    import importlib
else:
    from xml.etree.ElementTree import XMLParser as _XMLParser
    from xml.etree.ElementTree import iterparse as _iterparse
    from xml.etree.ElementTree import ParseError


from .common import (
    DTDForbidden,
    EntitiesForbidden,
    ExternalReferenceForbidden,
    _generate_etree_functions,
)

__origin__ = "xml.etree.ElementTree"


def _get_py3_cls():
    """Python 3.3 hides the pure Python code but defusedxml requires it.

    The code is based on test.support.import_fresh_module().
    """
    pymodname = "xml.etree.ElementTree"
    cmodname = "_elementtree"

    pymod = sys.modules.pop(pymodname, None)
    cmod = sys.modules.pop(cmodname, None)

    sys.modules[cmodname] = None
    pure_pymod = importlib.import_module(pymodname)
    if cmod is not None:
        sys.modules[cmodname] = cmod
    else:
        sys.modules.pop(cmodname)
    sys.modules[pymodname] = pymod

    _XMLParser = pure_pymod.XMLParser
    _iterparse = pure_pymod.iterparse
    ParseError = pure_pymod.ParseError

    return _XMLParser, _iterparse, ParseError


if PY3:
    _XMLParser, _iterparse, ParseError = _get_py3_cls()

_sentinel = object()


class DefusedXMLParser(_XMLParser):
    def __init__(
        self,
        html=_sentinel,
        target=None,
        encoding=None,
        forbid_dtd=False,
        forbid_entities=True,
        forbid_external=True,
    ):
        # Python 2.x old style class
        _XMLParser.__init__(self, target=target, encoding=encoding)
        if html is not _sentinel:
            # the 'html' argument has been deprecated and ignored in all
            # supported versions of Python. Python 3.8 finally removed it.
            if html:
                raise TypeError("'html=True' is no longer supported.")
            else:
                warnings.warn(
                    "'html' keyword argument is no longer supported. Pass "
                    "in arguments as keyword arguments.",
                    category=DeprecationWarning,
                )

        self.forbid_dtd = forbid_dtd
        self.forbid_entities = forbid_entities
        self.forbid_external = forbid_external
        if PY3:
            parser = self.parser
        else:
            parser = self._parser
        if self.forbid_dtd:
            parser.StartDoctypeDeclHandler = self.defused_start_doctype_decl
        if self.forbid_entities:
            parser.EntityDeclHandler = self.defused_entity_decl
            parser.UnparsedEntityDeclHandler = self.defused_unparsed_entity_decl
        if self.forbid_external:
            parser.ExternalEntityRefHandler = self.defused_external_entity_ref_handler

    def defused_start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
        raise DTDForbidden(name, sysid, pubid)

    def defused_entity_decl(
        self, name, is_parameter_entity, value, base, sysid, pubid, notation_name
    ):
        raise EntitiesForbidden(name, value, base, sysid, pubid, notation_name)

    def defused_unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
        # expat 1.2
        raise EntitiesForbidden(name, None, base, sysid, pubid, notation_name)  # pragma: no cover

    def defused_external_entity_ref_handler(self, context, base, sysid, pubid):
        raise ExternalReferenceForbidden(context, base, sysid, pubid)


# aliases
# XMLParse is a typo, keep it for backwards compatibility
XMLTreeBuilder = XMLParse = XMLParser = DefusedXMLParser

parse, iterparse, fromstring = _generate_etree_functions(
    DefusedXMLParser, _TreeBuilder, _parse, _iterparse
)
XML = fromstring


__all__ = [
    "ParseError",
    "XML",
    "XMLParse",
    "XMLParser",
    "XMLTreeBuilder",
    "fromstring",
    "iterparse",
    "parse",
    "tostring",
]

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