[Zope-dev] Re: ZPT: defer expression fix
Christian Heimes
heimes at faho.rwth-aachen.de
Sat Apr 2 11:01:15 EST 2005
Evan Simpson wrote:
> Christian Heimes wrote:
>
>> * DeferWrapper didn't cache the result of the expression like
>> ordinary vars do.
>
>
> This was intended, though you couldn't know that since I never
> documented this. Consider the following terrible example:
>
> <div tal:define="xis defer:string:x is $x">
> <p tal:repeat="x python:range(3)"
> tal:content="xis"></p>
> </div>
>
> This should evaluate to:
>
> <div>
> <p>x is 0</p>
> <p>x is 1</p>
> <p>x is 2</p>
> </div>
>
> Why?? I don't remember why I wanted this behavior; it was an
> experiment, and I can't find any code of mine that uses it.
That's an interessting use case. Do you want me to keep the code and
make up a new expression? I'm thinking about "lazy:".
Christian
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