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package Moose::Meta::TypeConstraint::Enum;
use strict;
use warnings;
use metaclass;
use Moose::Util::TypeConstraints ();
our $VERSION = '1.09';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::TypeConstraint';
__PACKAGE__->meta->add_attribute('values' => (
accessor => 'values',
));
sub new {
my ( $class, %args ) = @_;
$args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Str');
my $self = $class->_new(\%args);
$self->compile_type_constraint()
unless $self->_has_compiled_type_constraint;
return $self;
}
sub equals {
my ( $self, $type_or_name ) = @_;
my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
return unless $other->isa(__PACKAGE__);
my @self_values = sort @{ $self->values };
my @other_values = sort @{ $other->values };
return unless @self_values == @other_values;
while ( @self_values ) {
my $value = shift @self_values;
my $other_value = shift @other_values;
return unless $value eq $other_value;
}
return 1;
}
sub constraint {
my $self = shift;
my %values = map { $_ => undef } @{ $self->values };
return sub { exists $values{$_[0]} };
}
sub _compile_hand_optimized_type_constraint {
my $self = shift;
my %values = map { $_ => undef } @{ $self->values };
sub { defined($_[0]) && !ref($_[0]) && exists $values{$_[0]} };
}
sub create_child_type {
my ($self, @args) = @_;
return Moose::Meta::TypeConstraint->new(@args, parent => $self);
}
1;
__END__
=pod
=head1 NAME
Moose::Meta::TypeConstraint::Enum - Type constraint for enumerated values.
=head1 DESCRIPTION
This class represents type constraints based on an enumerated list of
acceptable values.
=head1 INHERITANCE
C<Moose::Meta::TypeConstraint::Enum> is a subclass of
L<Moose::Meta::TypeConstraint>.
=head1 METHODS
=over 4
=item B<< Moose::Meta::TypeConstraint::Enum->new(%options) >>
This creates a new enum type constraint based on the given
C<%options>.
It takes the same options as its parent, with several
exceptions. First, it requires an additional option, C<values>. This
should be an array reference containing a list of valid string
values. Second, it automatically sets the parent to the C<Str> type.
Finally, it ignores any provided C<constraint> option. The constraint
is generated automatically based on the provided C<values>.
=item B<< $constraint->values >>
Returns the array reference of acceptable values provided to the
constructor.
=item B<< $constraint->create_child_type >>
This returns a new L<Moose::Meta::TypeConstraint> object with the type
as its parent.
Note that it does I<not> return a C<Moose::Meta::TypeConstraint::Enum>
object!
=back
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHOR
Yuval Kogman E<lt>nothingmuch@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2006-2010 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
|
