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 import zLOG
  19
  20 class XMLParser:
  21
  22     ordered_attributes = 0
  23
  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         ]
  46
  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)
  64
  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, ' ')
  75
  76     def parseFile(self, filename):
  77         self.parseStream(open(filename))
  78
  79     def parseString(self, s):
  80         self.parser.Parse(s, 1)
  81
  82     def parseURL(self, url):
  83         import urllib
  84         self.parseStream(urllib.urlopen(url))
  85
  86     def parseStream(self, stream):
  87         self.parser.ParseFile(stream)
  88
  89     def parseFragment(self, s, end=0):
  90         self.parser.Parse(s, end)