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"""
Utilities for XML generation/parsing.
"""
import re
from collections import OrderedDict
from xml.sax.saxutils import XMLGenerator
class UnserializableContentError(ValueError):
pass
class SimplerXMLGenerator(XMLGenerator):
def addQuickElement(self, name, contents=None, attrs=None):
"Convenience method for adding an element with no children"
if attrs is None:
attrs = {}
self.startElement(name, attrs)
if contents is not None:
self.characters(contents)
self.endElement(name)
def characters(self, content):
if content and re.search(r'[\x00-\x08\x0B-\x0C\x0E-\x1F]', content):
# Fail loudly when content has control chars (unsupported in XML 1.0)
# See https://www.w3.org/International/questions/qa-controls
raise UnserializableContentError("Control characters are not supported in XML 1.0")
XMLGenerator.characters(self, content)
def startElement(self, name, attrs):
# Sort attrs for a deterministic output.
sorted_attrs = OrderedDict(sorted(attrs.items())) if attrs else attrs
super().startElement(name, sorted_attrs)