module-authors:
I'm not sure where to ask this question, so please refer me to a better
resource if there is one...
I'm trying to implement a centralized exception generation function, say
myconfess(), that I can use throughout my code. myconfess() will do
some things and then call Carp::confess(). I'd like the stack trace to
appear to come from the point where myconfess() was called, rather than
from where myconfess() calls Carp::confess().
Carp includes two hashes which are supposed to enable this --
%Carp::Internal and %Carp::CarpInternal. I've tried both, but can't
seem to get them working. $Carp::CarpLevel does seem to work.
Here's some demonstration code. The eval's around Carp::confess() are
there so that I can trap the exception, print it, and keep going:
2011-01-16 19:39:31 dpchrist@p43400e ~/sandbox
$ nl -b a carp-internal.pl
1 #!/usr/bin/perl
2
3 package Foo;
4 use Carp;
5 $Carp::Internal{ __PACKAGE__ }++;
6 sub myconfess {
7 eval {
8 Carp::confess @_;
9 };
10 print $@, "\n";
11 }
12
13 package Bar;
14 use Carp;
15 sub myconfess {
16 local $Carp::CarpLevel = 2;
17 eval {
18 Carp::confess @_;
19 };
20 print $@, "\n";
21 }
22
23 package Baz;
24 use Carp;
25 $Carp::CarpInternal{ __PACKAGE__ }++;
26 sub myconfess {
27 eval {
28 Carp::confess @_;
29 };
30 print $@, "\n";
31 }
32
33 package main;
34 sub run {
35 Foo::myconfess('goodbye, cruel world!');
36 Bar::myconfess('goodbye, cruel world!');
37 Baz::myconfess('goodbye, cruel world!');
38 }
39 run();
2011-01-16 19:39:42 dpchrist@p43400e ~/sandbox
$ perl carp-internal.pl
goodbye, cruel world! at carp-internal.pl line 8
eval {...} called at carp-internal.pl line 7
Foo::myconfess('goodbye, cruel world!') called at carp-internal.pl line
35
main::run() called at carp-internal.pl line 39
goodbye, cruel world! at carp-internal.pl line 36
main::run() called at carp-internal.pl line 39
goodbye, cruel world! at carp-internal.pl line 28
eval {...} called at carp-internal.pl line 27
Baz::myconfess('goodbye, cruel world!') called at carp-internal.pl line
37
main::run() called at carp-internal.pl line 39
I would like the output to be:
goodbye, cruel world! at carp-internal.pl line 35
main::run() called at carp-internal.pl line 39
goodbye, cruel world! at carp-internal.pl line 36
main::run() called at carp-internal.pl line 39
goodbye, cruel world! at carp-internal.pl line 37
main::run() called at carp-internal.pl line 39
Any suggestions?
TIA,
David
