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import collections
import xml.sax
XmlElement = collections.namedtuple("XmlElement", ["name", "attributes", "children"])
XmlText = collections.namedtuple("XmlText", ["value"])
element = XmlElement
text = XmlText
def parse_xml(fileobj, namespace_mapping=None):
if namespace_mapping is None:
namespace_prefixes = {}
else:
namespace_prefixes = dict((uri, prefix) for prefix, uri in namespace_mapping)
handler = Handler(namespace_prefixes)
parser = xml.sax.make_parser()
parser.setFeature(xml.sax.handler.feature_namespaces, True)
parser.setContentHandler(handler)
parser.parse(fileobj)
return handler.root()
class Handler(xml.sax.handler.ContentHandler):
def __init__(self, namespace_prefixes):
self._namespace_prefixes = namespace_prefixes
self._element_stack = [RootElement()]
self._character_buffer = []
def root(self):
return self._element_stack[0].children[0]
def startElementNS(self, name, qname, attrs):
self._flush_character_buffer()
attributes = dict((self._read_name(key), value) for key, value in attrs.items())
element = XmlElement(self._read_name(name), attributes, [])
self._element_stack[-1].children.append(element)
self._element_stack.append(element)
def endElementNS(self, name, qname):
self._flush_character_buffer()
self._element_stack.pop()
def characters(self, content):
self._character_buffer.append(content)
def _flush_character_buffer(self):
if self._character_buffer:
text = "".join(self._character_buffer)
self._element_stack[-1].children.append(XmlText(text))
self._character_buffer = []
def _read_name(self, name):
uri, local_name = name
if uri is None:
return local_name
else:
prefix = self._namespace_prefixes.get(uri)
if prefix is None:
return "{%s}%s" % (uri, local_name)
else:
return "%s:%s" % (prefix, local_name)
class RootElement(object):
def __init__(self):
self.children = []
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