[Petal] Does Petal support a simple while loop?

[Fergal Daly]

On Tuesday 24 June 2003 11:27, Grant McLean wrote:
> Yes, those are approaches to the specific issue of iterating through
> a list of values, but my specific requirement was really crying out
> for nested while loops.  To restate it in Perl:
> 
>    while(my($artist) = $rs->grouped_column('artist')) {
>      print_heading($artist);
>      while(my($row) = $rs->next) {
>        print_item($row);
>      }
>    }
> 
> So the call to $rs->grouped_column('artist') causes subsequent
> calls to $rs->next to terminate when the value in the 'artist'
> column changes.

Assuming you can specifiy arguments to the get_next method, what would be 
wrong with something like

<t petal:cursor="artist gouped_column('artist') rs">
	heading
	<t petal:cursor="row next rs">
		row
	</t>
</t>

> Generic iterator support is not actually going to solve that
> problem whereas a petal:while construct would.

I think it does assuming get_next can have arguments,

F