[Zope3-dev] RFC: zcml:condition

[Roger Ineichen]

Behalf Of Jim Fulton
> Sent: Saturday, February 19, 2005 10:01 PM
> To: Dieter Maurer
> Cc: Martijn Faassen; zope3-dev at zope.org
> Subject: Re: [Zope3-dev] RFC: zcml:condition
> 
> Dieter Maurer wrote:
> > ... ZCML conditional ...
> > 
> > There might be a wish for on "or" operator.
> > 
> > Say we have two online help systems "A" and "B" which provide
> > similar APIs but each with special extensions.
> > 
> > Then an application might want to say:
> > 
> >      condition="have(online_A) or have(online_B)"
> 
> This feels like a slippery slope, at the bottom of
> which is Python. :)
> 
> Perhaps, in this example, A and B should each provide
> "online".  After all, the application doesn't depend
> on online_A or online_B, it depends on the part that's
> common, which is online.

For me it's unclear what the scope of foo is, if I define 
a directive like.

<include zcml:condition="have foo" file="foo.zcml" />

Where is foo defined? Do we have another directive
like: 

<zope:condition="foo" method="zope.app.bar.foo" />

And in the class zope.app.bar we have a method like:

def foo():
    if today is sunday:
        return True
    return False


This way we could a method isAOrB and use it like:

def isAOrB ():
  online_A = get_this_info_from_somewhere()
  online_B = get_this_info_from_somewhere()
   if online_A or online:
      return True
   return False

register:
<zope:condition="foo" method="zope.app.bar.isAOrB" />

use it:

<include zcml:condition="have isAOrB " file="foo.zcml" />


Or I'm wrong? Then where is the foo in "have foo" from?


Regards
Roger Ineichen

> Jim
> 
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> Jim Fulton           mailto:jim at zope.com       Python Powered!
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