[Twisted-web] appropriate way to use patternGenerator

[James Y Knight]

On May 8, 2005, at 6:31 PM, Carl Shimer wrote:
> I spent the last couple of hours trying to get the nevow LivePage  
> stuff to
> work.  The problem was on this line of my code:
>
> Inevow.IQ(self.docFactory).patternGenerator('foo')
>

It sounds like you're doing things the hard way, but I don't quite  
understand your description of what you want to do -- it's a bit too  
abstract for me. Patterns are designed for use by the immediately  
enclosing renderer, so they operate on the unrendered tree, not the  
rendered tree.

This is how most pattern uses look. A renderer which uses them,  
immediately enclosing the patterns themselves.
def render_boolean(self, ctx, data):
   return IQ(ctx).allPatterns(data and 'true' or 'false')

<div n:data="foo" n:render="boolean">
<span n:pattern="true">True!</span>
<span n:pattern="false">False!</span>
</div>

Perhaps your use case would be better served by filling slots?

James