reverse the meaning of 'empty'

[gitmo/Moose.git] / lib / Moose / Meta / Attribute / Native / Trait / Array.pm

package Moose::Meta::Attribute::Native::Trait::Array;
use Moose::Role;

our $VERSION   = '0.89';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';

use Moose::Meta::Attribute::Native::MethodProvider::Array;

with 'Moose::Meta::Attribute::Native::Trait';

has 'method_provider' => (
    is        => 'ro',
    isa       => 'ClassName',
    predicate => 'has_method_provider',
    default   => 'Moose::Meta::Attribute::Native::MethodProvider::Array'
);

sub _helper_type { 'ArrayRef' }

no Moose::Role;

1;

__END__

=pod

=head1 NAME

Moose::Meta::Attribute::Native::Trait::Array

=head1 SYNOPSIS

    package Stuff;
    use Moose;

    has 'options' => (
       traits     => ['Array'],
       is         => 'ro',
       isa        => 'ArrayRef[Str]',
       default    => sub { [] },
       handles   => {
           all_options       => 'elements',
           map_options       => 'map',
           filter_options    => 'grep',
           find_option       => 'find',
           first_option      => 'first',
           last_option       => 'last',
           get_option        => 'get',
           join_options      => 'join',
           count_options     => 'count',
           has_no_options    => 'empty',
           sorted_options    => 'sort',
       }
    );

    no Moose;
    1;
    
=head1 DESCRIPTION

This module provides an Array attribute which provides a number of
array operations. 

=head1 PROVIDED METHODS

These methods are implemented in
L<Moose::Meta::Attribute::Native::MethodProvider::Array>.

=over 4

=item B<count>

Returns the number of elements in the array.

   $stuff = Stuff->new;
   $stuff->options(["foo", "bar", "baz", "boo"]);

   my $count = $stuff->count_options;
   print "$count\n"; # prints 4

=item B<empty>

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

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

=item B<find>

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

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

=item B<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"

=item B<map>

This method accepts a subroutine reference as its argument. The
subroutine will be executed for each element of the array. 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"

=item B<sort>

Sorts and returns the elements of the array.

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

=item B<elements>

Returns all of the elements of the array

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

=item B<join>

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

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

=item B<get>

Returns an element of the array by its index.

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

=item B<first>

Returns the first element of the array.

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

=item B<last>

Returns the last element of the array.

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

=item B<pop>

=item B<push>

=item B<set>

=item B<shift>

=item B<unshift>

=item B<clear>

=item B<delete>

=item B<insert>

=item B<splice>

=item B<sort_in_place>

Sorts the array I<in place>, modifying the value of the attribute.

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

=item B<accessor>

If passed one argument, returns the value of the requested element.
If passed two arguments, sets the value of the requested element.

=back

=head1 METHODS

=over 4

=item B<meta>

=item B<method_provider>

=item B<has_method_provider>

=back

=head1 BUGS

All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.

=head1 AUTHOR

Stevan Little E<lt>stevan@iinteractive.comE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2007-2009 by Infinity Interactive, Inc.

L<http://www.iinteractive.com>

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

=cut