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136 lines
5.7 KiB
Python
136 lines
5.7 KiB
Python
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# The strict feed parser that interfaces with an XML parsing library
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# Copyright 2010-2015 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from __future__ import absolute_import, unicode_literals
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from ..exceptions import UndeclaredNamespace
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class _StrictFeedParser(object):
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def __init__(self, baseuri, baselang, encoding):
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self.bozo = 0
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self.exc = None
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self.decls = {}
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self.baseuri = baseuri or ''
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self.lang = baselang
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self.encoding = encoding
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super(_StrictFeedParser, self).__init__()
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def _normalize_attributes(self, kv):
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k = kv[0].lower()
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v = k in ('rel', 'type') and kv[1].lower() or kv[1]
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return (k, v)
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def startPrefixMapping(self, prefix, uri):
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if not uri:
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return
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# Jython uses '' instead of None; standardize on None
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prefix = prefix or None
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self.trackNamespace(prefix, uri)
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if prefix and uri == 'http://www.w3.org/1999/xlink':
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self.decls['xmlns:' + prefix] = uri
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def startElementNS(self, name, qname, attrs):
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namespace, localname = name
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lowernamespace = str(namespace or '').lower()
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if lowernamespace.find('backend.userland.com/rss') != -1:
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# match any backend.userland.com namespace
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namespace = 'http://backend.userland.com/rss'
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lowernamespace = namespace
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if qname and qname.find(':') > 0:
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givenprefix = qname.split(':')[0]
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else:
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givenprefix = None
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prefix = self._matchnamespaces.get(lowernamespace, givenprefix)
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if givenprefix and (prefix == None or (prefix == '' and lowernamespace == '')) and givenprefix not in self.namespacesInUse:
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raise UndeclaredNamespace("'%s' is not associated with a namespace" % givenprefix)
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localname = str(localname).lower()
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# qname implementation is horribly broken in Python 2.1 (it
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# doesn't report any), and slightly broken in Python 2.2 (it
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# doesn't report the xml: namespace). So we match up namespaces
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# with a known list first, and then possibly override them with
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# the qnames the SAX parser gives us (if indeed it gives us any
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# at all). Thanks to MatejC for helping me test this and
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# tirelessly telling me that it didn't work yet.
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attrsD, self.decls = self.decls, {}
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if localname=='math' and namespace=='http://www.w3.org/1998/Math/MathML':
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attrsD['xmlns']=namespace
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if localname=='svg' and namespace=='http://www.w3.org/2000/svg':
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attrsD['xmlns']=namespace
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if prefix:
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localname = prefix.lower() + ':' + localname
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elif namespace and not qname: #Expat
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for name,value in self.namespacesInUse.items():
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if name and value == namespace:
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localname = name + ':' + localname
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break
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for (namespace, attrlocalname), attrvalue in attrs.items():
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lowernamespace = (namespace or '').lower()
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prefix = self._matchnamespaces.get(lowernamespace, '')
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if prefix:
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attrlocalname = prefix + ':' + attrlocalname
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attrsD[str(attrlocalname).lower()] = attrvalue
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for qname in attrs.getQNames():
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attrsD[str(qname).lower()] = attrs.getValueByQName(qname)
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localname = str(localname).lower()
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self.unknown_starttag(localname, list(attrsD.items()))
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def characters(self, text):
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self.handle_data(text)
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def endElementNS(self, name, qname):
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namespace, localname = name
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lowernamespace = str(namespace or '').lower()
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if qname and qname.find(':') > 0:
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givenprefix = qname.split(':')[0]
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else:
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givenprefix = ''
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prefix = self._matchnamespaces.get(lowernamespace, givenprefix)
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if prefix:
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localname = prefix + ':' + localname
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elif namespace and not qname: #Expat
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for name,value in self.namespacesInUse.items():
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if name and value == namespace:
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localname = name + ':' + localname
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break
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localname = str(localname).lower()
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self.unknown_endtag(localname)
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def error(self, exc):
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self.bozo = 1
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self.exc = exc
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# drv_libxml2 calls warning() in some cases
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warning = error
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def fatalError(self, exc):
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self.error(exc)
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raise exc
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