[Petal] [IDEA] Hash with params

[Steve Purkis]

On Friday, September 5, 2003, at 08:44  pm, Evan Simpson wrote:

> Steve Purkis wrote:
>>     $key => <span petal:replace="some/hash $key">hash key</span>
>> A similar argument would apply to Arrays:
>>     list[$idx] = <span petal:replace="some/list $idx">hash key</span>
>
> I'm not sure how well this would apply to Petal, but ZPTs are now 
> officially growing a path syntax extension that specifically deals 
> with these cases.  Examples of prefixed path segment usage are 
> "some/hash/key:keystring" and "some/list/item:0".  Apart from a set of 
> built-in prefixes, they are defined with tal:define="prefix <prefix> 
> <expression>".  Generally, a prefix acts as either a function with two 
> arguments or a namespace of single-argument functions.  The examples 
> above are of the first sort -- they take the current traversal object 
> and a key or integer argument.  An example of the second sort is the 
> 'standard' prefix, which in ZPTs is a namespace of standard formatting 
> functions, as in "some/number/standard:thousands_commas".

Interesting idea -- don't know what it would take to implement though.  
And I assume it would be possible to define prefixes that variables as 
arguments so that it would be possible to say "some/hash/key:somevar" 
and "some/list/item:someindex"?

-Steve