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'''XML lib compatibility layer for the Bcfg2 client'''
# library will use lxml, then builtin xml.etree, then ElementTree
# pylint: disable=E0611,W0611,W0613,C0103
try:
from lxml.etree import Element, SubElement, tostring, XMLParser
from lxml.etree import XMLSyntaxError as ParseError
from lxml.etree import XML as _XML
from Bcfg2.Compat import wraps
driver = 'lxml'
# libxml2 2.9.0+ doesn't parse 10M+ documents by default:
# https://mail.gnome.org/archives/commits-list/2012-August/msg00645.html
try:
_parser = XMLParser(huge_tree=True)
except TypeError:
_parser = XMLParser()
@wraps(_XML)
def XML(val, **kwargs):
""" unicode strings w/encoding declaration are not supported in
recent lxml.etree, so we try to read XML, and if it fails we try
encoding the string. """
kwargs.setdefault('parser', _parser)
try:
return _XML(val, **kwargs)
except ValueError:
return _XML(val.encode(), **kwargs)
except ImportError:
# lxml not available
from xml.parsers.expat import ExpatError as ParseError
try:
import xml.etree.ElementTree
Element = xml.etree.ElementTree.Element
SubElement = xml.etree.ElementTree.SubElement
XML = xml.etree.ElementTree.XML
def tostring(el, encoding=None, xml_declaration=None):
""" tostring implementation compatible with lxml """
return xml.etree.ElementTree.tostring(el, encoding=encoding)
driver = 'etree-py'
except ImportError:
try:
from elementtree.ElementTree import Element, SubElement, XML, \
tostring
driver = 'etree'
import elementtree.ElementTree
Element = elementtree.ElementTree.Element
SubElement = elementtree.ElementTree.SubElement
XML = elementtree.ElementTree.XML
def tostring(el, encoding=None, xml_declaration=None):
""" tostring implementation compatible with lxml """
return elementtree.ElementTree.tostring(el)
except ImportError:
print("Failed to load lxml, xml.etree or elementtree.ElementTree")
print("Cannot continue")
raise SystemExit(1)
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