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168 lines
5.9 KiB
168 lines
5.9 KiB
# Copyright (c) 2010 Mitch Garnaat http://garnaat.org/
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# Copyright (c) 2010, Eucalyptus Systems, Inc.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish, dis-
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# tribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the fol-
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# lowing conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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import xml.sax
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from boto import utils
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class XmlHandler(xml.sax.ContentHandler):
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def __init__(self, root_node, connection):
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self.connection = connection
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self.nodes = [('root', root_node)]
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self.current_text = ''
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def startElement(self, name, attrs):
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self.current_text = ''
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t = self.nodes[-1][1].startElement(name, attrs, self.connection)
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if t is not None:
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if isinstance(t, tuple):
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self.nodes.append(t)
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else:
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self.nodes.append((name, t))
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def endElement(self, name):
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self.nodes[-1][1].endElement(name, self.current_text, self.connection)
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if self.nodes[-1][0] == name:
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self.nodes.pop()
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self.current_text = ''
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def characters(self, content):
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self.current_text += content
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def parse(self, s):
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if not isinstance(s, bytes):
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s = s.encode('utf-8')
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xml.sax.parseString(s, self)
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class Element(dict):
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def __init__(self, connection=None, element_name=None,
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stack=None, parent=None, list_marker=('Set',),
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item_marker=('member', 'item'),
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pythonize_name=False):
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dict.__init__(self)
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self.connection = connection
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self.element_name = element_name
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self.list_marker = utils.mklist(list_marker)
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self.item_marker = utils.mklist(item_marker)
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if stack is None:
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self.stack = []
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else:
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self.stack = stack
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self.pythonize_name = pythonize_name
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self.parent = parent
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def __getattr__(self, key):
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if key in self:
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return self[key]
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for k in self:
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e = self[k]
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if isinstance(e, Element):
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try:
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return getattr(e, key)
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except AttributeError:
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pass
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raise AttributeError
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def get_name(self, name):
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if self.pythonize_name:
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name = utils.pythonize_name(name)
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return name
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def startElement(self, name, attrs, connection):
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self.stack.append(name)
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for lm in self.list_marker:
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if name.endswith(lm):
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l = ListElement(self.connection, name, self.list_marker,
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self.item_marker, self.pythonize_name)
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self[self.get_name(name)] = l
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return l
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if len(self.stack) > 0:
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element_name = self.stack[-1]
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e = Element(self.connection, element_name, self.stack, self,
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self.list_marker, self.item_marker,
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self.pythonize_name)
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self[self.get_name(element_name)] = e
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return (element_name, e)
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else:
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return None
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def endElement(self, name, value, connection):
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if len(self.stack) > 0:
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self.stack.pop()
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value = value.strip()
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if value:
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if isinstance(self.parent, Element):
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self.parent[self.get_name(name)] = value
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elif isinstance(self.parent, ListElement):
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self.parent.append(value)
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class ListElement(list):
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def __init__(self, connection=None, element_name=None,
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list_marker=['Set'], item_marker=('member', 'item'),
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pythonize_name=False):
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list.__init__(self)
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self.connection = connection
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self.element_name = element_name
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self.list_marker = list_marker
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self.item_marker = item_marker
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self.pythonize_name = pythonize_name
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def get_name(self, name):
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if self.pythonize_name:
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name = utils.pythonize_name(name)
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return name
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def startElement(self, name, attrs, connection):
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for lm in self.list_marker:
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if name.endswith(lm):
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l = ListElement(self.connection, name,
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self.list_marker, self.item_marker,
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self.pythonize_name)
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setattr(self, self.get_name(name), l)
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return l
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if name in self.item_marker:
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e = Element(self.connection, name, parent=self,
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list_marker=self.list_marker,
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item_marker=self.item_marker,
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pythonize_name=self.pythonize_name)
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self.append(e)
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return e
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else:
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return None
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def endElement(self, name, value, connection):
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if name == self.element_name:
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if len(self) > 0:
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empty = []
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for e in self:
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if isinstance(e, Element):
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if len(e) == 0:
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empty.append(e)
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for e in empty:
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self.remove(e)
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else:
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setattr(self, self.get_name(name), value)
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