jython-dev

[Jython-dev] using jpython

[James B. <bu...@pe...>]

Hello, I am using Jpython for static Java and SQL generation from XML files.
I have used the JDOM API from Python directly, but I definitely would like
to see compliance with Python's standard XML library. Is anyone working on
that? I would like to get involved with the Jython project - does anyone see
compliance as valuable?

Jim

Re: [Jython-dev] using jpython

[Robert W. B. <rb...@di...>]

Hello Jim,

On Wed, 15 Nov 2000, James Bullard wrote:
> Hello, I am using Jpython for static Java and SQL generation from XML files.
> I have used the JDOM API from Python directly, but I definitely would like
> to see compliance with Python's standard XML library. Is anyone working on
> that? I would like to get involved with the Jython project - does anyone see
> compliance as valuable?
> 
> Jim

No, I don't know of anybody working on that.

Yes, compliance is good.

Has the xml-sig defined what to be compliant means?
Not meant to be rhetorical- it just seems They were
in a terrible rush to make 2.0.  I really don't know the
answer, so nobody take that the wrong way :)

Note: there is a wealth of java xml tools 
that have not left me wanting for CPython's import xml.  The
advantage comes from when you switch between CPython and
Jython and want to use the same modules- I have not needed
that yet, but it always seems a noble goal and a situation
where one learns from the other.

It seems that a good plan would be to join the Jython lists,
and the xml-sig lists, then narrow down what a
'compliant' patch would involve.  I'm sure jython and the
xml-sig could benefit.

Best wishes,
Robert

Re: [Jython-dev] using jpython

[<bc...@wo...>]

[James Bullard]

[cc'ed to Lars Marius Garshol]

>Hello, I am using Jpython for static Java and SQL generation from XML files.
>I have used the JDOM API from Python directly, but I definitely would like
>to see compliance with Python's standard XML library. Is anyone working on
>that? I would like to get involved with the Jython project - does anyone see
>compliance as valuable?

There are some support for java xml parsers in the xml package in
CPython2.0. Look at Lib/xml/sax/__init__.py for examples of this.

In the CVS version from the XML-SIG there are even more support (in
Lib/xml/dom/javadom.py and others).

I have no no clue on how it all fits together or how much we can
actually use. Which is why Lars is cc'ed, I hope he can shed some light
on this topic.

Questions to Lars:

What do we need to support the xml package in jython? There seems to
missing at least a sax drv_xxx for the common java sax libraries. What
else? 

regards,
finn

Re: [Jython-dev] using jpython

[Lars M. G. <la...@ga...>]

* Finn Bock
| 
| What do we need to support the xml package in jython? There seems to
| missing at least a sax drv_xxx for the common java sax libraries.
| What else?

It depends to some extent on what you want.  Some of the packages,
like xmlproc, for example, can be used in Jython as they are.  I would
guess that minidom and probably also 4DOM can be used in Jython as
well.

I think the main thing that is missing is a SAX driver that can map
Java SAX 2.0 to Python SAX 2.0, since without this the Python DOMs
can't create DOM trees from XML documents.  This has been on my list
of things to do for a while, but at the moment I've been too busy to
do it.  It's planned that this driver will be a part of a package
called saxtools, which will again be part of the XML-SIG package.

But if anyone wants to write such a driver (shouldn't be hard), feel
free. I'll be happy to look over it and see that it is done correctly
and also to put it into the XML-SIG saxtools.

javadom.py should provide what is needed to use the Java DOM
implementations with the same interface as the Python ones.  Note that
this uses Java code only to create DOM trees from XML documents. It
hasn't been used for anything as far as I know, but it should still be
useful as it stands, although it may need some tweaks here and there.

eventdom by Paul Prescod is perhaps the most interesting piece of code
that is difficult to port.  It needs SAX, DOM and XPath in order to
work, and it's the XPath part that may be difficult.  It used to be
based on Dieter Maurer's PyXPath and it may be that it still is.
Whether PyXPath works in Jython or not I don't know.

I hope this helps.

--Lars M.

Re: [Jython-dev] using jpython

[<bc...@wo...>]

[Lars Marius Garshol explains what jython needs to support the xml
package]

>[snipped]
>
>I hope this helps.

It is very helpfull. Thank you for the explanation.


I tried to install xml under jython. To install I did this:

- Installed PyXML 0.6.2 under CPython2.0.
- Copies CPython2.0's Lib/xml to jython Lib/xml directory.
- Copies _xmlplus from the CPython2.0 directory to jython
  Lib/_xmlplus  directory.
- Added a "python.xml.sax.parser = xml.sax.drivers2.drv_xmlproc" to
  my registry file.

Something works, but most of the tests from 0.6.2's test suite crashes
or throws exceptions. There seems to be plenty of room for improvements
to its jython integration.

If anyone will try to make these improvements, I would like to include
the xml package in the jython installer. A CPython compatible API to xml
processing would be very valuable.

regards,
finn

Re: [Jython-dev] using jpython

[Lars M. G. <la...@ga...>]

* Finn Bock
| 
| I tried to install xml under jython. To install I did this:
| 
| - Installed PyXML 0.6.2 under CPython2.0.
| - Copies CPython2.0's Lib/xml to jython Lib/xml directory.
| - Copies _xmlplus from the CPython2.0 directory to jython
|   Lib/_xmlplus  directory.
| - Added a "python.xml.sax.parser = xml.sax.drivers2.drv_xmlproc" to
|   my registry file.

This last step was wrong.  The xmlproc driver in the drivers2
directory is for an older version of SAX 2.  I have an unreleased
version that handles the new version, which I could make available if
there is interest.  (Although it does need more development and
testing.)
 
| Something works, but most of the tests from 0.6.2's test suite
| crashes or throws exceptions. There seems to be plenty of room for
| improvements to its jython integration.
| 
| If anyone will try to make these improvements, I would like to
| include the xml package in the jython installer. A CPython
| compatible API to xml processing would be very valuable.

I would love to help, but realistically my time is very limited both
this month and the next, so I doubt that I will get much done during
that time.  After that I may be able to help.

Meanwhile you may try to post to the XML-SIG mailing list and ask for
volunteers.

--Lars M.

Re: [Jython-dev] using jpython

[<bc...@wo...>]

[Lars Marius Garshol]

>[...] I have an unreleased
>version that handles the new version, which I could make available if
>there is interest.  (Although it does need more development and
>testing.)

By all means, please show it. James Bullard have already expressed an
interrest in working at the jython / XML integration. 

regards,
finn