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|
package Moose::Meta::TypeConstraint::Enum;
our $VERSION = '2.4000';
use strict;
use warnings;
use metaclass;
use B;
use Moose::Util::TypeConstraints ();
use parent 'Moose::Meta::TypeConstraint';
use Moose::Util 'throw_exception';
__PACKAGE__->meta->add_attribute('values' => (
accessor => 'values',
Class::MOP::_definition_context(),
));
__PACKAGE__->meta->add_attribute('_inline_var_name' => (
accessor => '_inline_var_name',
Class::MOP::_definition_context(),
));
my $inliner = sub {
my $self = shift;
my $val = shift;
return 'defined(' . $val . ') '
. '&& !ref(' . $val . ') '
. '&& $' . $self->_inline_var_name . '{' . $val . '}';
};
my $var_suffix = 0;
sub new {
my ( $class, %args ) = @_;
$args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Str');
$args{inlined} = $inliner;
if ( scalar @{ $args{values} } < 1 ) {
throw_exception( MustHaveAtLeastOneValueToEnumerate => params => \%args,
class => $class
);
}
for (@{ $args{values} }) {
if (!defined($_)) {
throw_exception( EnumValuesMustBeString => params => \%args,
class => $class,
value => $_
);
}
elsif (ref($_)) {
throw_exception( EnumValuesMustBeString => params => \%args,
class => $class,
value => $_
);
}
}
my %values = map { $_ => 1 } @{ $args{values} };
$args{constraint} = sub { $values{ $_[0] } };
my $var_name = 'enums' . $var_suffix++;;
$args{_inline_var_name} = $var_name;
$args{inline_environment} = { '%' . $var_name => \%values };
my $self = $class->SUPER::new(\%args);
$self->compile_type_constraint()
unless $self->_has_compiled_type_constraint;
$self->message( sub {
my $value = shift;
sprintf(
'%s. Value must be equal to %s.',
$self->_default_message->( $value ),
Moose::Util::_english_list_or( map B::perlstring($_), @{ $self->values } ),
)
} );
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 create_child_type {
my ($self, @args) = @_;
return Moose::Meta::TypeConstraint->new(@args, parent => $self);
}
1;
# ABSTRACT: Type constraint for enumerated values.
__END__
=pod
=encoding UTF-8
=head1 NAME
Moose::Meta::TypeConstraint::Enum - Type constraint for enumerated values.
=head1 VERSION
version 2.4000
=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
=head2 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>.
=head2 $constraint->values
Returns the array reference of acceptable values provided to the
constructor.
=head2 $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!
=head1 BUGS
See L<Moose/BUGS> for details on reporting bugs.
=head1 AUTHORS
=over 4
=item *
Stevan Little <stevan@cpan.org>
=item *
Dave Rolsky <autarch@urth.org>
=item *
Jesse Luehrs <doy@cpan.org>
=item *
Shawn M Moore <sartak@cpan.org>
=item *
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
=item *
Karen Etheridge <ether@cpan.org>
=item *
Florian Ragwitz <rafl@debian.org>
=item *
Hans Dieter Pearcey <hdp@cpan.org>
=item *
Chris Prather <chris@prather.org>
=item *
Matt S Trout <mstrout@cpan.org>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by 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.
=cut
|
