[Zope] Re: Adding Custom Namespaces to ZPT?

[Hartmut Goebel]

Evan Simpson schrieb:
> For the most part, yes, but additional namespaces didn't occur to us 
> when implementing ZPT, and it is hardly trivial to define how such 
> extensibility should work.

After having a look into TALInterpreter.py I think a have a clue, why 
this is complicated. *sign*

Otherwise: TALInterpreter uses bytecode_handlers, thus adding new 
bytecodes should be quite easy. So the only problem being left (as far 
as I can see) is: how to make adding bytecodes or namespaces extensible.

Meanwhile I tried something different: I patched HTMLTALParser.py and 
ZopePageTemplate/__init__.py to recognice namespaces. One may pass a 
dict of namespaces to PageTemplate(). If a tag's prefix belongs to a 
namespace listed here, the tag get patched into somthing like

<metal:block
   tal:define="year string:'1999'"
   tal:content="python:namspaces['hg'].copyright(year=year)"
/>

Quite a hack, but works :-) Do you want to get the patch?

Never the less I would prefere a really expantable solution.

> but most of them are not
> integrated with Zope.

It seams as if I have bad luck on this topic.

Regards
+++hartmut
-- 
| Hartmut Goebel               | We build the crazy compilers |
| h.goebel@crazy-compilers.com | Compiler Manufacturer        |