NAME
Filter::Macro - Make macro modules that are expanded inline
VERSION
This document describes version 0.02 of Filter::Macro, released July 21, 2004.
SYNOPSIS
In MyHandyModules.pm:
package MyHandyModules;
use Filter::Macro;
# lines below will be expanded into caller's code
use strict;
use warnings;
use Switch;
use IO::All;
use Quantum::Superpositions;In your program or module:
use MyHandyModules; # lines above are expanded hereDESCRIPTION
If many of your programs begin with the same lines, it may make sense to abstract them away into a module, and use that module instead.
Sadly, it does not work that way, because by default, all lexical pragmas, source filters and subroutine imports invoked in MyHandyModules.pm takes effect in that module, not the calling programs.
One way to solve this problem is to use Filter::Include:
use Filter::Include;
include MyHandyModules;However, it would be really nice if MyHandyModules.pm could define the macro-like semantic itself, instead of placing the burden on the caller.
This module lets you do precisely that. All you need to do is to put one line in MyHandyModules.pm, after the package MyHandyModules; line:
use Filter::Macro;With this, a program or module that says use Filter::Macro will expand lines below use Filter::Macro into their own code, instead of the default semantic of evaluating them in the MyHandyModules package.
Line numbers in error and warning messages are unaffected by this module; they still point to the correct file name and line numbers.
SEE ALSO
Filter::Include, Filter::Simple
AUTHORS
Autrijus Tang <autrijus@autrijus.org>
Based on Damian Conway's concept, covered in his excellent Sufficiently Advanced Technologies talk.
COPYRIGHT
Copyright 2004 by Autrijus Tang <autrijus@autrijus.org>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.