[ZPT] unit testing new expression

[delza@landry.alliances.org]

Evan Simpson wrote:
> 
> > 2) What do I need to do to make the namespaces of the PageTemplate 
> > available to the expression when it is called?  This is what I'm having 
> > trouble testing, so the two questions are intimately related.
> 
> When a compiled TALES expression object is called, a single Context object 
> is passed to it.  This has several namespaces as attributes.  'vars' is the 
> complete namespace, while 'local_vars' and 'global_vars' are dictionaries of 
> local and global names.  You can also use the Context object's 'evaluate' 
> method to evaluate other expressions.

Thanks for the help!

So, if I compile an expression and call it, is the Context built or do I need
to create that myself?  Do I need to instantiate and Engine first?  I'm having
trouble visualizing the flow of control here.

--Dethe


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