Source Code for Module zeroinstall.support.xmltools

 1  """Convenience functions for handling XML. 
 2  @since: 1.9 
 3  """ 
 4   
 5  # Copyright (C) 2012, Thomas Leonard 
 6  # See the README file for details, or visit http://0install.net. 
 7   
 8  from xml.dom import Node 
 9                   
10 -def _compare_children(a, b): 
11          """@rtype: bool""" 
12          ac = a.childNodes 
13          bc = b.childNodes 
14   
15          if ac.length != bc.length: 
16                  return False 
17           
18          for i in range(ac.length): 
19                  if not nodes_equal(ac[i], bc[i]): 
20                          return False 
21   
22          return True 
23   
24 -def nodes_equal(a, b): 
25          """Compare two DOM nodes. 
26          Warning: only supports documents containing elements, text nodes and attributes (will crash on comments, etc). 
27          @rtype: bool""" 
28          if a.nodeType != b.nodeType: 
29                  return False 
30   
31          if a.nodeType == Node.ELEMENT_NODE: 
32                  if a.namespaceURI != b.namespaceURI: 
33                          return False 
34   
35                  if a.nodeName != b.nodeName: 
36                          return False 
37                   
38                  a_attrs = set([(name, value) for name, value in a.attributes.itemsNS()]) 
39                  b_attrs = set([(name, value) for name, value in b.attributes.itemsNS()]) 
40   
41                  if a_attrs != b_attrs: 
42                          #print "%s != %s" % (a_attrs, b_attrs) 
43                          return False 
44   
45                  return _compare_children(a, b) 
46          elif a.nodeType in (Node.TEXT_NODE, Node.CDATA_SECTION_NODE): 
47                  return a.wholeText == b.wholeText 
48          elif a.nodeType == Node.DOCUMENT_NODE: 
49                  return _compare_children(a, b) 
50          else: 
51                  assert 0, ("Unknown node type", a) 
52