oracular (3) MooseX::AttributeHelpers::MethodProvider::List.3pm.gz

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.