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