roundup/cgi/TAL/XMLParser.py

   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
  17 Modified for Roundup 0.5 release:
  18
  19 - removed dependency on zLOG
  20
  21 """
  22
  23 class XMLParser:
  24
  25     ordered_attributes = 0
  26
  27     handler_names = [
  28         "StartElementHandler",
  29         "EndElementHandler",
  30         "ProcessingInstructionHandler",
  31         "CharacterDataHandler",
  32         "UnparsedEntityDeclHandler",
  33         "NotationDeclHandler",
  34         "StartNamespaceDeclHandler",
  35         "EndNamespaceDeclHandler",
  36         "CommentHandler",
  37         "StartCdataSectionHandler",
  38         "EndCdataSectionHandler",
  39         "DefaultHandler",
  40         "DefaultHandlerExpand",
  41         "NotStandaloneHandler",
  42         "ExternalEntityRefHandler",
  43         "XmlDeclHandler",
  44         "StartDoctypeDeclHandler",
  45         "EndDoctypeDeclHandler",
  46         "ElementDeclHandler",
  47         "AttlistDeclHandler"
  48         ]
  49
  50     def __init__(self, encoding=None):
  51         self.parser = p = self.createParser()
  52         if self.ordered_attributes:
  53             try:
  54                 self.parser.ordered_attributes = self.ordered_attributes
  55             except AttributeError:
  56                 #zLOG.LOG("TAL.XMLParser", zLOG.INFO,
  57                 #         "Can't set ordered_attributes")
  58                 self.ordered_attributes = 0
  59         for name in self.handler_names:
  60             method = getattr(self, name, None)
  61             if method is not None:
  62                 try:
  63                     setattr(p, name, method)
  64                 except AttributeError:
  65                     #zLOG.LOG("TAL.XMLParser", zLOG.PROBLEM,
  66                     #         "Can't set expat handler %s" % name)
  67                     pass
  68
  69     def createParser(self, encoding=None):
  70         global XMLParseError
  71         try:
  72             from Products.ParsedXML.Expat import pyexpat
  73             XMLParseError = pyexpat.ExpatError
  74             return pyexpat.ParserCreate(encoding, ' ')
  75         except ImportError:
  76             from xml.parsers import expat
  77             XMLParseError = expat.ExpatError
  78             return expat.ParserCreate(encoding, ' ')
  79
  80     def parseFile(self, filename):
  81         self.parseStream(open(filename))
  82
  83     def parseString(self, s):
  84         self.parser.Parse(s, 1)
  85
  86     def parseURL(self, url):
  87         import urllib
  88         self.parseStream(urllib.urlopen(url))
  89
  90     def parseStream(self, stream):
  91         self.parser.ParseFile(stream)
  92
  93     def parseFragment(self, s, end=0):
  94         self.parser.Parse(s, end)