I'm surprised your second version does not work for you; it works for me.
use strict;
use warnings;
my @rules =
( q( return( "A", "Cat A" ) if $abs_diff < 75_000 and $source eq "IC
+E" ),
q( return( "B", "Dog B" ) if $abs_diff < 75_000 and $source eq "FO
+O" ),
q( return( "C", "Pig C" ) if $abs_diff < 75_000 and $source eq "BA
+R" ), );
my $abs_diff = 0;
my $source = 'FOO';
my @results = eval_rules();
print "@results\n";
sub eval_rules {
for my $rule ( @rules ) {
my ( $cat, $comment ) = eval $rule;
return ( $cat, $comment ) if $cat and $comment;
}
}
__END__
% perl rules.pl
B Dog B
If I were you, I'd code the rules without return, and so that the last expression in them is a clear, unambiguous value; e.g.
q( $abs_diff < 75_000 and $source eq "ICE" ? ( "A", "Cat A" ) : () )
Then you can write:
for my $rule ( @rules ) {
my @ret = eval $rule;
return @ret if @ret;
}
The way you have it, if the test is true, the
eval will return a list, otherwise it returns
undef, so simply testing for
@ret wouldn't work (it will always have a non-zero length).
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