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