(elem, encoding, default_namespace=None)
| 198 | # serialization support |
| 199 | |
| 200 | def _namespaces(elem, encoding, default_namespace=None): |
| 201 | # identify namespaces used in this tree |
| 202 | |
| 203 | # maps qnames to *encoded* prefix:local names |
| 204 | qnames = {None: None} |
| 205 | |
| 206 | # maps uri:s to prefixes |
| 207 | namespaces = {} |
| 208 | if default_namespace: |
| 209 | namespaces[default_namespace] = "" |
| 210 | |
| 211 | def encode(text): |
| 212 | return text.encode(encoding) |
| 213 | |
| 214 | def add_qname(qname): |
| 215 | # calculate serialized qname representation |
| 216 | try: |
| 217 | if qname[:1] == "{": |
| 218 | uri, tag = qname[1:].split("}", 1) |
| 219 | prefix = namespaces.get(uri) |
| 220 | if prefix is None: |
| 221 | prefix = _namespace_map.get(uri) |
| 222 | if prefix is None: |
| 223 | prefix = "ns%d" % len(namespaces) |
| 224 | if prefix != "xml": |
| 225 | namespaces[uri] = prefix |
| 226 | if prefix: |
| 227 | qnames[qname] = encode("%s:%s" % (prefix, tag)) |
| 228 | else: |
| 229 | qnames[qname] = encode(tag) # default element |
| 230 | else: |
| 231 | if default_namespace: |
| 232 | # FIXME: can this be handled in XML 1.0? |
| 233 | raise ValueError( |
| 234 | "cannot use non-qualified names with " |
| 235 | "default_namespace option" |
| 236 | ) |
| 237 | qnames[qname] = encode(qname) |
| 238 | except TypeError: |
| 239 | _raise_serialization_error(qname) |
| 240 | |
| 241 | # populate qname and namespaces table |
| 242 | try: |
| 243 | iterate = elem.iter |
| 244 | except AttributeError: |
| 245 | iterate = elem.getiterator # cET compatibility |
| 246 | for elem in iterate(): |
| 247 | tag = elem.tag |
| 248 | if isinstance(tag, QName) and tag.text not in qnames: |
| 249 | add_qname(tag.text) |
| 250 | elif isinstance(tag, str): |
| 251 | if tag not in qnames: |
| 252 | add_qname(tag) |
| 253 | elif tag is not None and tag is not Comment and tag is not PI: |
| 254 | _raise_serialization_error(tag) |
| 255 | for key, value in list(elem.items()): |
| 256 | if isinstance(key, QName): |
| 257 | key = key.text |
no test coverage detected