1 ##############################################################################
2 #
3 # Copyright (c) 2001, 2002 Zope Corporation and Contributors.
4 # All Rights Reserved.
5 #
6 # This software is subject to the provisions of the Zope Public License,
7 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
11 # FOR A PARTICULAR PURPOSE
12 #
13 ##############################################################################
14 """
15 Generic expat-based XML parser base class.
16 """
18 import zLOG
20 class XMLParser:
22 ordered_attributes = 0
24 handler_names = [
25 "StartElementHandler",
26 "EndElementHandler",
27 "ProcessingInstructionHandler",
28 "CharacterDataHandler",
29 "UnparsedEntityDeclHandler",
30 "NotationDeclHandler",
31 "StartNamespaceDeclHandler",
32 "EndNamespaceDeclHandler",
33 "CommentHandler",
34 "StartCdataSectionHandler",
35 "EndCdataSectionHandler",
36 "DefaultHandler",
37 "DefaultHandlerExpand",
38 "NotStandaloneHandler",
39 "ExternalEntityRefHandler",
40 "XmlDeclHandler",
41 "StartDoctypeDeclHandler",
42 "EndDoctypeDeclHandler",
43 "ElementDeclHandler",
44 "AttlistDeclHandler"
45 ]
47 def __init__(self, encoding=None):
48 self.parser = p = self.createParser()
49 if self.ordered_attributes:
50 try:
51 self.parser.ordered_attributes = self.ordered_attributes
52 except AttributeError:
53 zLOG.LOG("TAL.XMLParser", zLOG.INFO,
54 "Can't set ordered_attributes")
55 self.ordered_attributes = 0
56 for name in self.handler_names:
57 method = getattr(self, name, None)
58 if method is not None:
59 try:
60 setattr(p, name, method)
61 except AttributeError:
62 zLOG.LOG("TAL.XMLParser", zLOG.PROBLEM,
63 "Can't set expat handler %s" % name)
65 def createParser(self, encoding=None):
66 global XMLParseError
67 try:
68 from Products.ParsedXML.Expat import pyexpat
69 XMLParseError = pyexpat.ExpatError
70 return pyexpat.ParserCreate(encoding, ' ')
71 except ImportError:
72 from xml.parsers import expat
73 XMLParseError = expat.ExpatError
74 return expat.ParserCreate(encoding, ' ')
76 def parseFile(self, filename):
77 self.parseStream(open(filename))
79 def parseString(self, s):
80 self.parser.Parse(s, 1)
82 def parseURL(self, url):
83 import urllib
84 self.parseStream(urllib.urlopen(url))
86 def parseStream(self, stream):
87 self.parser.ParseFile(stream)
89 def parseFragment(self, s, end=0):
90 self.parser.Parse(s, end)