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File::Find::Rule::Extending (3)
  • >> File::Find::Rule::Extending (3) ( Разные man: Библиотечные вызовы )
  •  

    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 that everyone wanted to add extra features. With the 0.07 release this became 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 main File::Find::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::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.  

    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::Rule

    File::Find::Rule::MMagic was the first extension module, so maybe check that out.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    Declare your package
    Inherit methods from File::Find::Rule
    Taking no arguments.
    AUTHOR
    COPYRIGHT
    SEE ALSO


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