On Thu, 2 Feb 2006, Andy Wardley wrote:
With reference to:
http://catalyst.perl.org/random/castaway/2005/12/16/Template_Provider_DBI
Jess Robinson wrote:
And while I'm at it, does anything actually use the PREFIX_MAP code? It
seems that the FAQ, the Changes doc and the code itself are all
contradictory, and the implementation appears as if it would not work.
It's confusing I admit, and only partially documented in a half-hearted
attempt to discourage people from using it in case I ever decided to
think about it properly and implement something better.
But as far as I can tell, it is consistent and does work.
The values in PREFIX_MAP are numbers or strings containing a list
of numbers, delimited by any sequence of non-number characters.
foo => 1
bar => '2'
baz => '3 4 5'
boz => '6, 7, 8'
This gets expanded by the Template::Content::_init() method to reference
the actual providers in LOAD_TEMPLATES ($providers in the code fragment
below):
while (my ($key, $val) = each %$prefix_map) {
$prefix_map->{ $key } = [
ref $val
? $val
: map { $providers->[$_] }
split(/\D+/, $val)
] unless ref $val eq 'ARRAY';
}
Then in the template() method we select the providers based on any
prefix specified, or the { default } option, or the whole LOAD_TEMPLATES
list.
if (defined $prefix) {
$providers = $self->{ PREFIX_MAP }->{ $prefix }
|| return $self->throw("bad prefix blah...);
}
$providers = $self->{ PREFIX_MAP }->{ default }
|| $self->{ LOAD_TEMPLATES }
unless $providers;
Then we ask each $provider in @$providers in turn for the template
and that pretty much wraps it up.
Hrmm.. thanks for that, I guess it was even more confusing than I was
thinking.. ;)
Jess
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