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# Copyright (c) 2010 Mitch Garnaat http://garnaat.org/
# Copyright (c) 2010, Eucalyptus Systems, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import xml.sax
import utils
class XmlHandler(xml.sax.ContentHandler):
def __init__(self, root_node, connection):
self.connection = connection
self.nodes = [('root', root_node)]
self.current_text = ''
def startElement(self, name, attrs):
self.current_text = ''
t = self.nodes[-1][1].startElement(name, attrs, self.connection)
if t != None:
if isinstance(t, tuple):
self.nodes.append(t)
else:
self.nodes.append((name, t))
def endElement(self, name):
self.nodes[-1][1].endElement(name, self.current_text, self.connection)
if self.nodes[-1][0] == name:
self.nodes.pop()
self.current_text = ''
def characters(self, content):
self.current_text += content
def parse(self, s):
xml.sax.parseString(s, self)
class Element(dict):
def __init__(self, connection=None, element_name=None,
stack=None, parent=None, list_marker=('Set',),
item_marker=('member', 'item'),
pythonize_name=False):
dict.__init__(self)
self.connection = connection
self.element_name = element_name
self.list_marker = utils.mklist(list_marker)
self.item_marker = utils.mklist(item_marker)
if stack is None:
self.stack = []
else:
self.stack = stack
self.pythonize_name = pythonize_name
self.parent = parent
def __getattr__(self, key):
if key in self:
return self[key]
for k in self:
e = self[k]
if isinstance(e, Element):
try:
return getattr(e, key)
except AttributeError:
pass
raise AttributeError
def get_name(self, name):
if self.pythonize_name:
name = utils.pythonize_name(name)
return name
def startElement(self, name, attrs, connection):
self.stack.append(name)
for lm in self.list_marker:
if name.endswith(lm):
l = ListElement(self.connection, name, self.list_marker,
self.item_marker, self.pythonize_name)
self[self.get_name(name)] = l
return l
if len(self.stack) > 0:
element_name = self.stack[-1]
e = Element(self.connection, element_name, self.stack, self,
self.list_marker, self.item_marker,
self.pythonize_name)
self[self.get_name(element_name)] = e
return (element_name, e)
else:
return None
def endElement(self, name, value, connection):
if len(self.stack) > 0:
self.stack.pop()
value = value.strip()
if value:
if isinstance(self.parent, Element):
self.parent[self.get_name(name)] = value
elif isinstance(self.parent, ListElement):
self.parent.append(value)
class ListElement(list):
def __init__(self, connection=None, element_name=None,
list_marker=['Set'], item_marker=('member', 'item'),
pythonize_name=False):
list.__init__(self)
self.connection = connection
self.element_name = element_name
self.list_marker = list_marker
self.item_marker = item_marker
self.pythonize_name = pythonize_name
def get_name(self, name):
if self.pythonize_name:
name = utils.pythonize_name(name)
return name
def startElement(self, name, attrs, connection):
for lm in self.list_marker:
if name.endswith(lm):
l = ListElement(self.connection, name, self.item_marker,
pythonize_name=self.pythonize_name)
setattr(self, self.get_name(name), l)
return l
if name in self.item_marker:
e = Element(self.connection, name, parent=self,
pythonize_name=self.pythonize_name)
self.append(e)
return e
else:
return None
def endElement(self, name, value, connection):
if name == self.element_name:
if len(self) > 0:
empty = []
for e in self:
if isinstance(e, Element):
if len(e) == 0:
empty.append(e)
for e in empty:
self.remove(e)
else:
setattr(self, self.get_name(name), value)
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