Re: problems with try-ark

--=-=-=

Edward Moy provided a truly excellent problem report on
Thursday, the details of which we'll get to shortly...

The general issue we're dealing with here is that there's
just *no telling* what combination of Python and XML support
a (try-)ARK'ing site will have.

Traditionally, the core ARK people have used a reasonably
modern Python with a recent-ish PyXML "module" added on.
(Why? Because in the early days, nothing else really
worked.)  Latterly, we have claimed to support a plain old
Python out of the box -- because it includes a not-too-bad
"minidom" XML thing, and ARK has v modest XMLing needs.

But whether a plain old minidom'ing Python will really work
depends on whether it's got an expat parser wired into it.
Somewhat bizarrely, if you build Python and it doesn't find
an expat library, it will (*SILENTLY*) build you a minidom
thing anyway -- and it will be totally useless to man or
beast.

The code for 'read' in ARK/arkbase/ark/xmlfile.py *tries* to
account for these various possibilities, and to provide the
rest of ARK with an interface blissfully untroubled by the
vagaries of Python implementations.  Sadly, if it fails,
your first encounter with the ARK code base will be a scary
one :-(

The Moy Report reflects bit rot in the xmlfile.py code for
the minidom-with-a-decent-expat case.  I attach a copy with
my initial fixes in it.  (I'll run with this a while before
checking it in.)  OK, a few specific things...

> ... Looks like it is because comments are being handled
> differently in Python 2.3.x:

As I say, I think it's a minidom vs PyXML thing, not a
version thing.

> Panic: sigh: element <#comment> is bogus
>
> so I changed the line in _process_subfields() to:
>
>      elif hname == 'comment' or hname == '#comment':

That confuses an <!-- XML comment --> with an <comment>ARK
comment</comment>, not that it matters a lot.

> Seems that some of the <code> sections in sidai/package/ALL.xml use
> CDATA, and _process_code() is unhappy:

I tried to handle this by munging things in one place (a
little local routine, is_textly).

Anyway, you can see what I did; and I'll keep running it,
and check it in soon.  Thanks again for a very fine report.

Will


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Content-Type: application/octet-stream
Content-Disposition: attachment; filename=xmlfile.py
Content-Transfer-Encoding: base64
Content-Description: hacked ARK/arkbase/ark/xmlfile.py

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