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# encoding: utf-8
"""
Namespace-related objects.
"""
from __future__ import absolute_import, print_function, unicode_literals
nsmap = {
"a": "http://schemas.openxmlformats.org/drawingml/2006/main",
"c": "http://schemas.openxmlformats.org/drawingml/2006/chart",
"cp": "http://schemas.openxmlformats.org/package/2006/metadata/core-properties",
"dc": "http://purl.org/dc/elements/1.1/",
"dcmitype": "http://purl.org/dc/dcmitype/",
"dcterms": "http://purl.org/dc/terms/",
"dgm": "http://schemas.openxmlformats.org/drawingml/2006/diagram",
"m": "http://schemas.openxmlformats.org/officeDocument/2006/math",
"pic": "http://schemas.openxmlformats.org/drawingml/2006/picture",
"r": "http://schemas.openxmlformats.org/officeDocument/2006/relationships",
"sl": "http://schemas.openxmlformats.org/schemaLibrary/2006/main",
"w": "http://schemas.openxmlformats.org/wordprocessingml/2006/main",
'w14': "http://schemas.microsoft.com/office/word/2010/wordml",
"wp": "http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing",
"xml": "http://www.w3.org/XML/1998/namespace",
"xsi": "http://www.w3.org/2001/XMLSchema-instance",
}
pfxmap = dict((value, key) for key, value in nsmap.items())
class NamespacePrefixedTag(str):
"""
Value object that knows the semantics of an XML tag having a namespace
prefix.
"""
def __new__(cls, nstag, *args):
return super(NamespacePrefixedTag, cls).__new__(cls, nstag)
def __init__(self, nstag):
self._pfx, self._local_part = nstag.split(':')
self._ns_uri = nsmap[self._pfx]
@property
def clark_name(self):
return '{%s}%s' % (self._ns_uri, self._local_part)
@classmethod
def from_clark_name(cls, clark_name):
nsuri, local_name = clark_name[1:].split('}')
nstag = '%s:%s' % (pfxmap[nsuri], local_name)
return cls(nstag)
@property
def local_part(self):
"""
Return the local part of the tag as a string. E.g. 'foobar' is
returned for tag 'f:foobar'.
"""
return self._local_part
@property
def nsmap(self):
"""
Return a dict having a single member, mapping the namespace prefix of
this tag to it's namespace name (e.g. {'f': 'http://foo/bar'}). This
is handy for passing to xpath calls and other uses.
"""
return {self._pfx: self._ns_uri}
@property
def nspfx(self):
"""
Return the string namespace prefix for the tag, e.g. 'f' is returned
for tag 'f:foobar'.
"""
return self._pfx
@property
def nsuri(self):
"""
Return the namespace URI for the tag, e.g. 'http://foo/bar' would be
returned for tag 'f:foobar' if the 'f' prefix maps to
'http://foo/bar' in nsmap.
"""
return self._ns_uri
def nsdecls(*prefixes):
"""
Return a string containing a namespace declaration for each of the
namespace prefix strings, e.g. 'p', 'ct', passed as *prefixes*.
"""
return ' '.join(['xmlns:%s="%s"' % (pfx, nsmap[pfx]) for pfx in prefixes])
def nspfxmap(*nspfxs):
"""
Return a dict containing the subset namespace prefix mappings specified by
*nspfxs*. Any number of namespace prefixes can be supplied, e.g.
namespaces('a', 'r', 'p').
"""
return dict((pfx, nsmap[pfx]) for pfx in nspfxs)
def qn(tag):
"""
Stands for "qualified name", a utility function to turn a namespace
prefixed tag name into a Clark-notation qualified tag name for lxml. For
example, ``qn('p:cSld')`` returns ``'{http://schemas.../main}cSld'``.
"""
prefix, tagroot = tag.split(':')
uri = nsmap[prefix]
return '{%s}%s' % (uri, tagroot)
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