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File::Find::Rule::Extending

Section: User Contributed Perl Documentation (3)
Updated: 2025-06-11
Index

NAME

File::Find::Rule::Extending - the mini-guide to extending File::Find::Rule

SYNOPSIS

 package File::Find::Rule::Random; use strict;  # take useful things from File::Find::Rule use base 'File::Find::Rule'; # and force our crack into the main namespace sub File::Find::Rule::random () {     my $self = shift()->_force_object;     $self->exec( sub { rand > 0.5 } ); }  1;

DESCRIPTION

File::Find::Rule went down so well with the buying public thateveryone wanted to add extra features. With the 0.07 release thisbecame a possibility, using the following conventions.

Declare your package

 package File::Find::Rule::Random; use strict;

Inherit methods from File::Find::Rule

 # take useful things from File::Find::Rule use base 'File::Find::Rule';

Force your madness into the main package

 # and force our crack into the main namespace sub File::Find::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 mainFile::Find::Rule namespace. This is due to lack of imaginiation on mypart - I simply can't find a way for the functional and oo interfaceto work without doing this or some kind of inheritance, andinheritance stops you using two File::Find::Rule::Foo modulestogether.

For this reason try and pick distinct names for your extensions. Ifthis becomes a problem then I may institute a semi-official registryof taken names.

Taking no arguments.

Note the null prototype on random. This is a cheat for the proceduralinterface to know that your sub takes no arguments, and so allows thisto happen:

 find( random => in => '.' );

If you hadn't declared "random" with a null prototype it would haveconsumed "in" as a parameter to it, then got all confused as itdoesn't know about a '.' rule.

AUTHOR

Richard Clamp <richardcAATTunixbeard.net>

COPYRIGHT

This module is free software; you can redistribute it and/or modify itunder the same terms as Perl itself.

Index

NAME

SYNOPSIS

DESCRIPTION

Declare your package
Inherit methods from File::Find::Rule
Taking no arguments.

AUTHOR

COPYRIGHT

SEE ALSO

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