NAME¶

MooseX::AttributeHelpers::MethodProvider::List - method generator for MooseX::AttributeHelpers::Collection::List

VERSION¶

version 0.25

SYNOPSIS¶

   package Stuff;
   use Moose;
   use MooseX::AttributeHelpers;
   has 'options' => (
       metaclass  => 'Collection::List',
       is         => 'rw',
       isa        => 'ArrayRef[Str]',
       default    => sub { [] },
       auto_deref => 1,
       provides   => {
           elements => 'all_options',
           map      => 'map_options',
           grep     => 'filter_options',
           find     => 'find_option',
           first    => 'first_option',
           last     => 'last_option',
           get      => 'get_option',
           join     => 'join_options',
           count    => 'count_options',
           empty    => 'do_i_have_options',
           sort     => 'sorted_options',
       }
   );
   no Moose;
   1;

DESCRIPTION¶

This is a role which provides the method generators for MooseX::AttributeHelpers::Collection::List.

METHODS¶

meta

PROVIDED METHODS¶

count

Returns the number of elements in the list.

   $stuff = Stuff->new;
   $stuff->options(["foo", "bar", "baz", "boo"]);
   my $count = $stuff->count_options;
   print "$count\n"; # prints 4
    

empty

If the list is populated, returns true. Otherwise, returns false.

   $stuff->do_i_have_options ? print "Good boy.\n" : die "No options!\n" ;
    

find

This method accepts a subroutine reference as its argument. That sub will receive each element of the list in turn. If it returns true for an element, that element will be returned by the "find" method.

   my $found = $stuff->find_option( sub { $_[0] =~ /^b/ } );
   print "$found\n"; # prints "bar"
    

grep

This method accepts a subroutine reference as its argument. This method returns every element for which that subroutine reference returns a true value.

   my @found = $stuff->filter_options( sub { $_[0] =~ /^b/ } );
   print "@found\n"; # prints "bar baz boo"
    

map

This method accepts a subroutine reference as its argument. The subroutine will be executed for each element of the list. It is expected to return a modified version of that element. The return value of the method is a list of the modified options.

   my @mod_options = $stuff->map_options( sub { $_[0] . "-tag" } );
   print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag"
    

sort

Sorts and returns the elements of the list.

You can provide an optional subroutine reference to sort with (as you can with the core "sort" function). However, instead of using $a and $b, you will need to use $_[0] and $_[1] instead.

   # ascending ASCIIbetical
   my @sorted = $stuff->sort_options();
   # Descending alphabetical order
   my @sorted_options = $stuff->sort_options( sub { lc $_[1] cmp lc $_[0] } );
   print "@sorted_options\n"; # prints "foo boo baz bar"
    

elements

Returns all of the elements of the list

   my @option = $stuff->all_options;
   print "@options\n"; # prints "foo bar baz boo"
    

join

Joins every element of the list using the separator given as argument.

   my $joined = $stuff->join_options( ':' );
   print "$joined\n"; # prints "foo:bar:baz:boo"
    

get

Returns an element of the list by its index.

   my $option = $stuff->get_option(1);
   print "$option\n"; # prints "bar"
    

first

Returns the first element of the list.

   my $first = $stuff->first_option;
   print "$first\n"; # prints "foo"
    

last

Returns the last element of the list.

   my $last = $stuff->last_option;
   print "$last\n"; # prints "boo"
    

SUPPORT¶

Bugs may be submitted through the RT bug tracker <https://rt.cpan.org/Public/Dist/Display.html?Name=MooseX-AttributeHelpers> (or bug-MooseX-AttributeHelpers@rt.cpan.org <mailto:bug-MooseX-AttributeHelpers@rt.cpan.org>).

There is also a mailing list available for users of this distribution, at <http://lists.perl.org/list/moose.html>.

There is also an irc channel available for users of this distribution, at "#moose" on "irc.perl.org" <irc://irc.perl.org/#moose>.

AUTHOR¶

Stevan Little <stevan@iinteractive.com>

COPYRIGHT AND LICENSE¶

This software is copyright (c) 2007 by Stevan Little and Infinity Interactive, Inc.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.