| """ | |
| Utilities for XML generation/parsing. | |
| """ | |
| import re | |
| 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 = dict(sorted(attrs.items())) if attrs else attrs | |
| super().startElement(name, sorted_attrs) | |