12-19-2007
Quote:
Originally Posted by
porter
FYI: Rule 6, no homework.
just some mercy mr porter
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LEARN ABOUT DEBIAN
file::find::object::rule::extending
File::Find::Object::Rule::Extending(3pm) User Contributed Perl Documentation File::Find::Object::Rule::Extending(3pm)
NAME
File::Find::Object::Rule::Extending - the mini-guide to extending File::Find::Object::Rule
SYNOPSIS
package File::Find::Object::Rule::Random;
use strict;
use warnings;
# take useful things from File::Find::Object::Rule
use base 'File::Find::Object::Rule';
# and force our crack into the main namespace
sub File::Find::Object::Rule::random () {
my $self = shift()->_force_object;
$self->exec( sub { rand > 0.5 } );
}
1;
DESCRIPTION
File::Find::Object::Rule inherits File::Find::Rule's extensibility. It is now possibile to extend it, using the following conventions.
Declare your package
package File::Find::Object::Rule::Random;
use strict;
use warnings;
Inherit methods from File::Find::Object::Rule
# take useful things from File::Find::Object::Rule
use base 'File::Find::Object::Rule';
Force your madness into the main package
# and force our crack into the main namespace
sub File::Find::Object::Rule::random () {
my $self = shift()->_force_object;
$self->exec( sub { rand > 0.5 } );
}
Yes, we're being very cavalier here and defining things into the main File::Find::Object::Rule namespace. This is due to lack of
imaginiation on my part - I simply can't find a way for the functional and oo interface to work without doing this or some kind of
inheritance, and inheritance stops you using two File::Find::Object::Rule::Foo modules together.
For this reason try and pick distinct names for your extensions. If this becomes a problem then I may institute a semi-official registry
of taken names.
Taking no arguments.
Note the null prototype on random. This is a cheat for the procedural interface to know that your sub takes no arguments, and so allows
this to happen:
find( random => in => '.' );
If you hadn't declared "random" with a null prototype it would have consumed "in" as a parameter to it, then got all confused as it doesn't
know about a '.' rule.
NOTES ABOUT THE CALLBACK
The callback can access the File::Find::Object::Result using "$self->finder->item_obj()".
AUTHOR
Richard Clamp <richardc@unixbeard.net>
COPYRIGHT
Copyright (C) 2002 Richard Clamp. All Rights Reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
File::Find::Object::Rule
File::Find::::Rule::MMagic was the first extension module for File::Find::Rule, so maybe check that out.
perl v5.14.2 2012-05-05 File::Find::Object::Rule::Extending(3pm)