[IronPython] pyexpat and IronPython

[Dino Viehland]

Do you mean copying & pasting this to the console?  Or is this some issue you run into when actually using pyexpat?

From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Sridevi Aishwariya
Sent: Monday, August 07, 2006 9:47 PM
To: Discussion of IronPython
Subject: Re: [IronPython] pyexpat and IronPython

__slots__ = [
       "StartElementHandler",
       "EndElementHandler",
       "CharacterDataHandler",
       ]
gives an error
On 8/5/06, Mark Rees <mark.john.rees at gmail.com<mailto:mark.john.rees at gmail.com>> wrote:
Hi,

Seo has already done a basic pyexpat wrapper. He posted about it in:

http://lists.ironpython.com/pipermail/users-ironpython.com/2005-November/001227.html

And it can be found at:

http://sparcs.kaist.ac.kr/~tinuviel/fepy/old/pyexpat.py

I have used this with ElementTree. There are limitations like iterparse
doesn't work and if the XML you are parsing contains an empty element
i.e <doc /> it fails. I have modified Seo's pyexpat.py to handle the
second limitation and have included the source in this email. I have
used this for my elementtree requirements but the XML I parse is simple
so there may be other as yet undiscovered issues.

Regards

Mark

Modified version of pyexpat from
http://sparcs.kaist.ac.kr/~tinuviel/fepy/old/pyexpat.py


import clr
clr.AddReference(" System.Xml")

from System.IO import MemoryStream, SeekOrigin, StreamWriter
from System.Xml import NameTable, XmlNamespaceManager, XmlParserContext,
XmlSpace
from System.Xml import XmlTextReader, XmlNodeType

def ErrorString(errno):
   if errno > 0:
       return "unknown error"
   else:
       return None

def ParserCreate(*args):
   return xmlparser()

class xmlparser:

   __slots__ = [
       "StartElementHandler",
       "EndElementHandler",
       "CharacterDataHandler",
       ]

   returns_unicode = False

   def __init__(self):
       self._stream = MemoryStream()
       self._parser = self._make_parser()

   def Parse(self, data, isfinal=False):
       self._append_stream(data)
       self._parse()
       if isfinal:
           self._stream.Close()

   def _make_parser(self):
       table = NameTable()
       manager = XmlNamespaceManager(table)
       parser = XmlParserContext(table, manager, None, XmlSpace.None)
       return parser

   def _append_stream(self, data):
       stream = self._stream
       position = stream.Position
       stream.Seek(0, SeekOrigin.End)
       writer = StreamWriter(stream)
       writer.Write(data)
       writer.Flush()
       stream.Position = position

   def _parse(self):
       reader = XmlTextReader(self._stream, XmlNodeType.Element,
self._parser)
       while reader.Read():
           nodetype = reader.NodeType
           if nodetype == XmlNodeType.Element:
               name = reader.Name
               attributes = {}
               while reader.MoveToNextAttribute():
                   attributes[reader.Name] = reader.Value
               if hasattr(self, "StartElementHandler"):
                   self.StartElementHandler(name, attributes)
               # Create EndElement event as XmlTextReader doesn't
               # do this for empty elements
               if reader.IsEmptyElement :
                   nodetype = XmlNodeType.EndElement
           if nodetype == XmlNodeType.EndElement:
               name = reader.Name
               if hasattr(self, "EndElementHandler"):
                   self.EndElementHandler(name)
           elif nodetype == XmlNodeType.Text:
               data = reader.Value
               if hasattr(self, "CharacterDataHandler"):
                   self.CharacterDataHandler (data)






Monty Taylor wrote:
> You could write a Python or C# wrapper around System.XML that behaves
> like pyexpat and contribute it. :)
>
> Monty
>
> On 8/4/06, Bruce Christensen < t-bruch at microsoft.com<mailto:t-bruch at microsoft.com>> wrote:
>
>> Nope. :) pyexpat relies on Python extension modules written in C, which
>> don't work with IronPython. However, you can use the classes in the .NET
>> System.Xml namespace for parsing XML documents if you're writing new
>> code.
>>
>> --Bruce
>>
>> -----Original Message-----
>> From: users-bounces at lists.ironpython.com<mailto:users-bounces at lists.ironpython.com>
>> [mailto:users-bounces at lists.ironpython.com<mailto:users-bounces at lists.ironpython.com>] On Behalf Of Sridevi
>> Sent: Thursday, August 03, 2006 5:41 AM
>> To: users-ironpython.com at lists.ironpython.com<mailto:users-ironpython.com at lists.ironpython.com>
>> Subject: [IronPython] pyexpat and IronPython
>>
>> Iam unable to run pyexpat from IronPython
>> Is there any files i got to add for it
>>
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