[Zope] Re: page templates and "python:"

[Tres Seaver]

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Lennart Regebro wrote:
> On 7/3/06, Chris McDonough
> <chrism at plope.com> wrote:
>> Actually, I think python: expressions perform slightly better than
>> their path: counterparts because their evaluation step needs to do
>> less work (no guessing about getitem vs. getattr).  Geoff Davis
>> taught me that.  But in the end it's all dwarfed by the penalty
>> imposed by security, so it really doesn't much matter.
> 
> Right. So the best and quickest is to prepare all the data in pure
> disk-based python.
> It's easy to do if you use the view methodology you get with Five, but
> there are other ways to do it if you don't want to use views.

My 'pushpage' package is an attempt to make this the "standard" pattern
(pushpage templates don't have *any* top-level names available to them
(i.e., 'context', 'container', 'request', etc.) except those passed to
their '__call__' as keyword arguments (which traditional ZPT exposes
under 'options'):

  http://agendaless.com/Members/tseaver/software/pushpage

The templates can be used from within methods of view classes, and can
also be published as "pages" via ZCML with the help of a user-defined
callable which computes the keyword arguments.  E.g.:

      <pushpage:view
        for=".interfaces.ISomeContentInterface"
        name="somepage.html"
        permission="zope.Public"
        template="templates/sometemplate.pt"
        mapping=".somemodule,somefunction"
        layer="mylayer"
        />

In this example, 'somemodule.somefunction' returns the mapping which
'sometemplate' will use as its top-level namespace.  The callable is
passed 'context' and 'request' as arguments.


Tres.
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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