/usr/share/pyshared/zope/dublincore/xmlmetadata.py is in python-zope.dublincore 3.8.2-0ubuntu1.
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#
# Copyright (c) 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Dublin Core XML data parser and writer
"""
__docformat__ = 'restructuredtext'
import xml.sax
import xml.sax.handler
from cStringIO import StringIO
from xml.sax.saxutils import escape, quoteattr
from zope.dublincore import dcterms
XSI_TYPE = (dcterms.XSI_NS, "type")
dublin_core_namespaces = dcterms.DC_NS, dcterms.DCTERMS_NS
DEFAULT_NAMESPACE_PREFIXES = {
# uri: prefix,
dcterms.DC_NS: "dc",
dcterms.DCTERMS_NS: "dcterms",
dcterms.XSI_NS: "xsi",
}
class NamespaceTracker(object):
def __init__(self, mapping=None):
self._mapping = {}
self._used = {}
if mapping:
self._mapping.update(mapping)
self._counter = 0
def encode(self, (uri, localname)):
if not uri:
return localname
if uri not in self._mapping:
self._counter += 1
prefix = "ns%d" % self._counter
self._mapping[uri] = prefix
self._used[prefix] = uri
else:
prefix = self._mapping[uri]
if prefix not in self._used:
self._used[prefix] = uri
if prefix:
return "%s:%s" % (prefix, localname)
else:
return localname
def getPrefixMappings(self):
return self._used.items()
def dumpString(mapping):
sio = StringIO()
nsmap = NamespaceTracker(DEFAULT_NAMESPACE_PREFIXES)
items = mapping.items()
items.sort()
prev = None
for name, values in items:
name, type = dcterms.splitEncoding(name)
group = name.split(".", 1)[0]
if prev != group:
sio.write("\n")
prev = group
if name in dcterms.name_to_element:
element, t = dcterms.name_to_element[name]
qname = nsmap.encode(element)
if not type:
type = t
if type:
type = " %s=%s" % (nsmap.encode((dcterms.XSI_NS, "type")),
quoteattr(type))
for value in values:
sio.write(" <%s%s>\n %s\n </%s>\n"
% (qname, type, _encode_string(value), qname))
else:
raise RuntimeError("could not serialize %r metadata element"
% name)
content = sio.getvalue()
sio = StringIO()
sio.write("<?xml version='1.0' encoding='utf-8'?>\n"
"<metadata")
for prefix, uri in nsmap.getPrefixMappings():
sio.write("\n xmlns:%s=%s" % (prefix, quoteattr(uri)))
sio.write(">\n")
sio.write(content)
sio.write("</metadata>\n")
return sio.getvalue()
try:
unicode
except NameError:
_encode_string = escape
else:
def _encode_string(s):
if isinstance(s, unicode):
s = s.encode('utf-8')
return escape(s)
def parse(source, error_handler=None):
parser, ch = _setup_parser(error_handler)
parser.parse(source)
return ch.mapping
def parseString(text, error_handler=None):
parser, ch = _setup_parser(error_handler)
parser.feed(text)
parser.close()
return ch.mapping
def _setup_parser(error_handler):
parser = xml.sax.make_parser()
ch = DublinCoreHandler()
parser.setFeature(xml.sax.handler.feature_namespaces, True)
parser.setContentHandler(ch)
if error_handler is not None:
parser.setErrorHandler(error_handler)
return parser, ch
class PrefixManager(object):
# We don't use this other than in the DublinCoreHandler, but it's
# entirely general so we'll separate it out for now.
"""General handler for namespace prefixes.
This should be used as a mix-in when creating a ContentHandler.
"""
__prefix_map = None
def startPrefixMapping(self, prefix, uri):
if self.__prefix_map is None:
self.__prefix_map = {}
pm = self.__prefix_map
pm.setdefault(prefix, []).append(uri)
def endPrefixMapping(self, prefix):
pm = self.__prefix_map
uris = pm[prefix]
del uris[-1]
if not uris:
del pm[prefix]
def get_uri(self, prefix):
pm = self.__prefix_map
if pm is None:
return None
if prefix in pm:
return pm[prefix][-1]
else:
return None
class DublinCoreHandler(PrefixManager, xml.sax.handler.ContentHandler):
def startDocument(self):
self.mapping = {}
self.stack = []
def get_dc_container(self):
name = None
for (uri, localname), dcelem, validator in self.stack:
if uri in dublin_core_namespaces:
name = uri, localname
if name in dcterms.element_to_name:
# dcelem contains type info, so go back to the mapping
return dcterms.element_to_name[name]
else:
return None
def startElementNS(self, name, qname, attrs):
self.buffer = u""
# TODO: need convert element to metadata element name
dcelem = validator = None
if name in dcterms.element_to_name:
dcelem = dcterms.element_to_name[name]
type = attrs.get(XSI_TYPE)
if type:
if not dcelem:
raise ValueError(
"data type specified for unknown metadata element: %s"
% qname)
if ":" in type:
prefix, t = type.split(":", 1)
ns = self.get_uri(prefix)
if ns != dcterms.DCTERMS_NS:
raise ValueError("unknown data type namespace: %s" % t)
type = t
if type not in dcterms.encodings:
raise ValueError("unknown data type: %r" % type)
allowed_in, validator = dcterms.encodings[type]
dcelem_split = dcelem.split(".")
for elem in allowed_in:
elem_split = elem.split(".")
if dcelem_split[:len(elem_split)] == elem_split:
break
else:
raise ValueError("%s values are not allowed for %r"
% (type, dcelem))
dcelem = "%s.%s" % (dcelem, type)
if dcelem:
cont = self.get_dc_container()
if cont and cont != dcelem:
prefix = cont + "."
if not dcelem.startswith(prefix):
raise ValueError("%s is not a valid refinement for %s"
% (dcelem, cont))
self.stack.append((name, dcelem, validator))
def endElementNS(self, name, qname):
startname, dcelem, validator = self.stack.pop()
assert startname == name
if self.buffer is None:
return
data = self.buffer.strip()
self.buffer = None
if not dcelem:
return
if validator is not None:
validator(data)
if dcelem in self.mapping:
self.mapping[dcelem] += (data,)
else:
self.mapping[dcelem] = (data,)
def characters(self, data):
if self.buffer is not None:
self.buffer += data
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