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import collections
import xml.sax
XmlElementBase = collections.namedtuple("XmlElement", ["name", "attributes", "children"])
class XmlElement(XmlElementBase):
def find_child_or_null(self, name):
return self.find_child(name) or _null_xml_element
def find_child(self, name):
for child in self.children:
if child.name == name:
return child
def find_children(self, name):
return XmlElementList(filter(
lambda child: child.node_type == node_types.element and child.name == name,
self.children
))
class XmlElementList(object):
def __init__(self, elements):
self._elements = elements
def __iter__(self):
return iter(self._elements)
def find_children(self, name):
children = []
for element in self._elements:
for child in element.find_children(name):
children.append(child)
return XmlElementList(children)
class NullXmlElement(object):
attributes = {}
def find_child_or_null(self, name):
return self
def find_child(self, name):
return None
_null_xml_element = NullXmlElement()
XmlText = collections.namedtuple("XmlText", ["value"])
def element(name, attributes=None, children=None):
return XmlElement(name, attributes or {}, children or [])
text = XmlText
class node_types(object):
element = 1
text = 3
XmlElement.node_type = node_types.element
XmlText.node_type = node_types.text
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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