Perrin Harkins wrote:
> On Tue, Oct 7, 2008 at 5:03 PM, Matt Hucke <[EMAIL PROTECTED]> wrote:
>> Is there any way to prevent TT from calling functions that don't exist and
>> falling into AUTOLOAD?
>
> I think you want to implement can() in your module.
I use can() within Autoload. I'm doing something like this (simplified here:)
package MyDerivedClass;
our @ISA = qw(MyBaseClass);
...
package MyBaseClass;
sub AUTOLOAD
{
unless ($AUTOLOAD =~ m/(.*)::([^:]+)/) ## classname::function
{
die("I don't understand function name $AUTOLOAD.");
}
my $classname = $1;
my $func = $2;
if (my $fp = MyBaseClass->can($func))
{
return &$fp(@_, classname => $classname);
# most functions of MyBaseClass know what to do with a classname => X
parameter
} else {
die("$classname doesn't know how to $func");
}
}
When I call
[% foo.hashkey %]
either for a hashkey that is known to exist or one that's not yet defined (but
might, under some
circumstances, be defined - I don't want undef to be an error), it dies at the
second 'die()' above.
I've put in a temporary kluge (not shown) where it checks if $_[0] is the right
class to be $self,
and returns $self->{$func} (interpreting the so-called function name as a hash
key), but this has
the side effect that any undefined function name called by accident (in the
main program as well as
from a template) is now a function that returns '' - and that's very bad.
<p relevance="tangential">
The reason for this AUTOLOAD is that I want to inherit functions that are
called without an existing
object ( called "static" in other languages), for which @ISA is ignored; most
of these are
object-creation functions. I've been doing things like
$objects = MyDerivedClass::factoryLoad(database => $db, query =>
whatever);
(This line appears in packages that are not subclasses of the base class in
question - for which I
don't want to muddy up their namespace with Exporter).
Without the AUTOLOAD, I had to make a factoryLoad function within
MyDerivedClass - it's just a
wrapper that calls the base class's loader with "classname => __PACKAGE__"
stuck on the end. I hate
these little stub functions, and thought AUTOLOAD could mimic them for me -
this worked beautifully
until I tried to use one of these in a template, and found it calling AUTOLOAD
for every attempt to
access a variable.
</p>
thanks, matt.
--
[EMAIL PROTECTED]
http://www.graveyards.com
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