in reply to Re^5: Exporter. Correct way to override import? (archaic perldoc)
in thread Exporter. Correct way to override import?

Please explain:

->export_to_level can't be "exported", since it is a method. (expects the obj/class as first argument). In order to work you need to require or use exporter first.

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Wikisyntax for the Monastery

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Re^7: Exporter. Correct way to override import?
by Veltro (Hermit) on May 06, 2018 at 22:41 UTC

    Oh, I was just trying to abuse the Exporter to to create a flexible function importer over packages with the ability to be able to redefine the function on a higher level

    Let's say I have a package structure (where I make sure that the sub packages have a 'use parent' statement)

    Parent->ChildX ->ChildY->GrandchildYX ->GrandchildYY

    Inside of these packages I want have a bunch of functions with the same name:

    Parent.function1 (function1 defined in Parent) ChildX.function1 (function1 imported from Parent) ChildX.function2 (function2 defined in ChildX) ChildY.function1 (function1 defined in ChildY) ChildY.function2 (function2 defined in ChildY) GrandchildYX.function1 (function1 imported from ChildY) GrandchildYX.function2 (function2 defined in GrandchildYX)
    Any program that I use
    use Parent qw(function1) # function 1 from Parent or use ChildX qw(function1 function2) # function1 from Parent, function2 +from ChildX or use ChildY qw(function1) # function1 from ChildY or use GrandchildYX qw(function1 function2) # function1 from ChildY, func +tion2 from GrandchildYX

    The experiment/challenge was to see if I can pull this off by writing ONE import function in Parent

    The code that I wrote works now I think, but it relies on the method export_to_level which I basically abuse and call static

    If you want I can share the code (not now though it is late), but I have to warn you it is an ugly piece

      not sure if I understand what you describe, but
      package myModule; require XYZ; sub import { XYZ->import("function") } 1;

      should import XYZ::function if you use MyModule

      update

      Sorry seems only to work for pragmas ... the code in Modern::Perl is confusing me...

      update
      you can always do it manually

      package myModule; use strict; use warnings; require Data::Dump; sub import { my $target_pkg = (caller)[0]; no strict 'refs'; for my $func ( qw/dd pp/) { *{"$target_pkg::$func"}= \&{"Data::Dump::$func"}; } } 1;

      Cheers Rolf
      (addicted to the Perl Programming Language and ☆☆☆☆ :)
      Wikisyntax for the Monastery