On Tue, Jul 03, 2001 at 11:54:42PM -0400, [EMAIL PROTECTED] wrote:
>
> On 29-Jun-2001 Rocco Caputo wrote:
> > On Fri, Jun 29, 2001 at 12:54:30PM -0400, [EMAIL PROTECTED] wrote:
> >> For those of you who aren't on IRC, here is a list of different schemes
> >> for doing addressing in POE and beyond.
> >>
> >> http://pied.nu/Perl/addresses.txt
> >>
> >> Anyone have other ideas? Any preferences?
> >
> > URI style isn't transparent. Ideally, a program shouldn't need to
> > know whether it's talking to a poe thingy or a stem thingy, so
> > everything up to the colon gets in the way.
Yeah! I agree! With myself! Me too!
> > I'm partial to kernel/session/event, where kernel/ and kernel/session
> > can just be left off if they're not needed:
> >
> > kernel/session/event
> > session/event
> > event
>
> Given a plain scallar, taken out of context (say in the doco, or in email,
> or in a tuple-space), how do you tell if it's a session, kernel or event?
>
> session/
> kernel//
No kernel or event mentioned:
"/session/"
No session or event mentioned:
"kernel//"
Same as yield:
"//" or just ""
Machines can read it; why can't people? I understand, though: at
first glance, the reader's got to do a little more thinking.
Positional fields suck, especially when paths like that get long (just
what does "/milkyway/sol/earth/n-america/dngor//" mean?). That's a
point scored for that ugly "/tag=value/tag=value" format.
Anyway, here's how it's parsed. Mind you, I just woke up and this is
just a little better than pseudocode.
sub parse_address {
my $address = shift;
my ($kernel, $session, $event);
my @address = split /\//, $address;
if (@address == 0) {
# Pathological case: yield() by another name.
($kernel, $session, $event) = ($my_kernel, $my_session, $my_event);
}
elsif (@address == 1) {
($kernel, $session, $event) = ($my_kernel, $my_session, @address);
}
elsif (@address == 2) {
($kernel, $session, $event) = ($my_kernel, @address);
}
elsif (@address == 3) {
($kernel, $session, $event) = @address;
}
else {
croak "What you say";
}
# Empty fields are filled in with current defaults.
$kernel ||= $my_kernel;
$session ||= $my_session;
$event ||= $my_event;
# Do whatever with it.
...;
}
[...]
> > I think it scales, too:
> > universe/galaxy/solarsystem/planet/cluster/kernel/session/event
> >
> > Oh, this is just a bang path in disguise. Whee! "/" is a little
> > easier to type than "!", anyway.
>
> IHNJ, IJLS BANG PATH
Bang! Path! Bang! Path! Bang! Path! Bang! Path! Smock! Smock! Smock!
-- Rocco Caputo / [EMAIL PROTECTED] / poe.perl.org / poe.sourceforge.net
