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[compat] add compat_etree_register_namespace

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This commit is contained in:
Remita Amine 2017-01-29 16:03:39 +01:00
parent 4d2fdb07c4
commit c2d9c25f81
1 changed files with 18 additions and 0 deletions
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18
youtube_dl/compat.py
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@ -2529,6 +2529,24 @@ else:
el.text = el.text.decode('utf-8')
return doc
if hasattr(etree, 'register_namespace'):
compat_etree_register_namespace = etree.register_namespace
else:
def compat_etree_register_namespace(prefix, uri):
"""Register a namespace prefix.
The registry is global, and any existing mapping for either the
given prefix or the namespace URI will be removed.
*prefix* is the namespace prefix, *uri* is a namespace uri. Tags and
attributes in this namespace will be serialized with prefix if possible.
ValueError is raised if prefix is reserved or is invalid.
"""
if re.match(r"ns\d+$", prefix):
raise ValueError("Prefix format reserved for internal use")
for k, v in list(etree._namespace_map.items()):
if k == uri or v == prefix:
del etree._namespace_map[k]
etree._namespace_map[uri] = prefix
if sys.version_info < (2, 7):
# Here comes the crazy part: In 2.6, if the xpath is a unicode,
# .//node does not match if a node is a direct child of . !