Its a slow Friday afternoon, I hope folks will forgive my public musings.
I was looking at Zope 3's configuration XML scheme, ZCML (1) and thought to myself how
horrible using XML files is for web-site configuration tasks.
It reminded me somewhat of a web framework I built some years ago on top of the
Borland Delphi web capabilities which used an XML file to determine the structure of
the URI's in the application. I found the verbosity of XML to be a real limiting
factor : hand editing at a 1000+ line XML file was just too painful.
But the concept expressed in python doesn't seem too bad...
from webapp import WebApp, Uri
app = WebApp()
app.name = 'mysite'
app.i18n = 'translations.ini' #Ini file containing translation text
news = Uri()
news.path = 'news'
news.processor = 'newspage.py' #returns a namespace that will be applied to the
template
news.i18n = 'news' #name of ini file section containing translations
news.presentation = 'news.tmpl' #name of template that consumes namespace provided by
processor
app.root.appendUri(news)
newsed = Uri()
newsed.path = 'edit'
newsed.addParameter('id',required=1) #require an ID parameter to be passed
newsed.canGET.add('hasRole','newsmanager') #Who can GET this page
newsed.canPost.add('hasRole','newsmanager') #Who can POST to this page
newsed.processor = 'newsedit.py'
newsed.i18n = 'newsedit'
newsed.presentation = 'news_edit.tmpl'
news.appendUri(newsed) #add as a child of news e.g. /mysite/news/edit?id=1
What I'm attempting is to force a defined structure on my WebApp so that only URI's
that I deem valid can be called - not just files I happen to leave lying around in a
"published" area.
I'm also trying to address things like Internationalization, separation of
presentation from content, parameter checking and security checking so that the
"processor" for a web page ends up being just a generator of a dictionary of content
to be pushed into a presentation template (by whatever means).
Being able to interrogate the structure of App() from a python prompt should also be a
big help during development.
I don't know how this fits into Webware or whether it can. There are better minds than
mine out there and a lot more experience. Perhaps someone will pipe-up and say "it's
been done in product X and it doesn't work for the following reasons...". As I said at
the start of this, it's a slow friday afternoon....
ZCML :
(1)
http://cvs.zope.org/~checkout~/Zope3/doc/zcml/meta.stx?rev=HEAD&content-type=text/plain
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