This is a task for the Aspect module.
after
{ $_[0]->return_value( '('. $_[0]->return_value. ')' ) }
call 'SomePackage::value';
Sure you could do this with Hook::LexWrap, in fact that is
how Aspect does it. But this is easier. The main difference
is that you can select entire groups of methods, using a pointcut
language.
Say you wanted to parenthesize not one method, but all
MyPackage methods, except the constructor:
after
{ $_[0]->return_value( '('. $_[0]->return_value. ')' ) }
call qr/^SomePackage/ &
!call qr/^SomePackage::new/;
Unfortunately you cannot match by attributes or inheritance yet.
And if you want to create a reusable aspect (like the Wormhole):
# creating an aspect
package Aspect::Library::Parenthesize;
use Aspect;
use base 'Aspect::Modular';
sub get_advice {
after
{ $_[0]->return_value( '('. $_[0]->return_value. ')' ) }
pop;
}
# using the new aspect
package main;
use Aspect;
use SomePackage;
aspect Parenthesize =>
call 'SomePackage::value' &
!cflow 'HatesParentheses::run' &
cflow 'LikesParentheses::run';
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