use Moose::Meta::TypeCoercion::Union;
-our $VERSION = '0.62_02';
-$VERSION = eval $VERSION;
-our $AUTHORITY = 'cpan:STEVAN';
+use List::MoreUtils qw(all);
+use List::Util qw(first);
use base 'Moose::Meta::TypeConstraint';
__PACKAGE__->meta->add_attribute('type_constraints' => (
accessor => 'type_constraints',
- default => sub { [] }
+ default => sub { [] },
+ Class::MOP::_definition_context(),
));
-sub new {
+sub new {
my ($class, %options) = @_;
+
+ my $name = join '|' => sort { $a cmp $b }
+ map { $_->name } @{ $options{type_constraints} };
+
my $self = $class->SUPER::new(
- name => (join '|' => sort {$a cmp $b}
- map { $_->name } @{$options{type_constraints}}),
- parent => undef,
- message => undef,
- hand_optimized_type_constraint => undef,
- compiled_type_constraint => sub {
- my $value = shift;
- foreach my $type (@{$options{type_constraints}}) {
- return 1 if $type->check($value);
- }
- return undef;
- },
- %options
+ name => $name,
+ %options,
);
- $self->_set_constraint(sub { $self->check($_[0]) });
- $self->coercion(Moose::Meta::TypeCoercion::Union->new(
- type_constraint => $self
- ));
+
+ $self->_set_constraint( $self->_compiled_type_constraint );
+
return $self;
}
+# XXX - this is a rather gross implementation of laziness for the benefit of
+# MX::Types. If we try to call ->has_coercion on the objects during object
+# construction, this does not work when defining a recursive constraint with
+# MX::Types.
+sub coercion {
+ my $self = shift;
+
+ return $self->{coercion} if exists $self->{coercion};
+
+ # Using any instead of grep here causes a weird error with some corner
+ # cases when MX::Types is in use. See RT #61001.
+ if ( grep { $_->has_coercion } @{ $self->type_constraints } ) {
+ return $self->{coercion} = Moose::Meta::TypeCoercion::Union->new(
+ type_constraint => $self );
+ }
+ else {
+ return $self->{coercion} = undef;
+ }
+}
+
+sub has_coercion {
+ return defined $_[0]->coercion;
+}
+
+sub _actually_compile_type_constraint {
+ my $self = shift;
+
+ my @constraints = @{ $self->type_constraints };
+
+ return sub {
+ my $value = shift;
+ foreach my $type (@constraints) {
+ return 1 if $type->check($value);
+ }
+ return undef;
+ };
+}
+
+sub can_be_inlined {
+ my $self = shift;
+
+ # This was originally done with all() from List::MoreUtils, but that
+ # caused some sort of bizarro parsing failure under 5.10.
+ for my $tc ( @{ $self->type_constraints } ) {
+ return 0 unless $tc->can_be_inlined;
+ }
+
+ return 1;
+}
+
+sub _inline_check {
+ my $self = shift;
+ my $val = shift;
+
+ return '('
+ . (
+ join ' || ', map { '(' . $_->_inline_check($val) . ')' }
+ @{ $self->type_constraints }
+ )
+ . ')';
+}
+
+sub inline_environment {
+ my $self = shift;
+
+ return { map { %{ $_->inline_environment } }
+ @{ $self->type_constraints } };
+}
+
sub equals {
my ( $self, $type_or_name ) = @_;
return @other_constraints == 0;
}
-sub parents {
+sub parent {
my $self = shift;
- $self->type_constraints;
+
+ my ($first, @rest) = @{ $self->type_constraints };
+
+ for my $parent ( $first->_collect_all_parents ) {
+ return $parent if all { $_->is_a_type_of($parent) } @rest;
+ }
+
+ return;
}
sub validate {
$message .= ($message ? ' and ' : '') . $err
if defined $err;
}
- return ($message . ' in (' . $self->name . ')') ;
+ return ($message . ' in (' . $self->name . ')') ;
+}
+
+sub find_type_for {
+ my ($self, $value) = @_;
+
+ return first { $_->check($value) } @{ $self->type_constraints };
}
sub is_a_type_of {
my ($self, $type_name) = @_;
- foreach my $type (@{$self->type_constraints}) {
- return 1 if $type->is_a_type_of($type_name);
- }
- return 0;
+
+ return all { $_->is_a_type_of($type_name) } @{ $self->type_constraints };
}
sub is_subtype_of {
my ($self, $type_name) = @_;
- foreach my $type (@{$self->type_constraints}) {
- return 1 if $type->is_subtype_of($type_name);
- }
- return 0;
+
+ return all { $_->is_subtype_of($type_name) } @{ $self->type_constraints };
}
sub create_child_type {
1;
+# ABSTRACT: A union of Moose type constraints
+
__END__
=pod
-=head1 NAME
-
-Moose::Meta::TypeConstraint::Union - A union of Moose type constraints
-
=head1 DESCRIPTION
-This metaclass represents a union of Moose type constraints. More
-details to be explained later (possibly in a Cookbook recipe).
+This metaclass represents a union of type constraints. A union takes
+multiple type constraints, and is true if any one of its member
+constraints is true.
-This actually used to be part of Moose::Meta::TypeConstraint, but it
-is now better off in it's own file.
+=head1 INHERITANCE
-=head1 METHODS
-
-This class is not a subclass of Moose::Meta::TypeConstraint,
-but it does provide the same API
+C<Moose::Meta::TypeConstraint::Union> is a subclass of
+L<Moose::Meta::TypeConstraint>.
=over 4
-=item B<meta>
-
-=item B<new>
-
-=item B<name>
-
-=item B<type_constraints>
+=item B<< Moose::Meta::TypeConstraint::Union->new(%options) >>
-=item B<parents>
+This creates a new class type constraint based on the given
+C<%options>.
-=item B<constraint>
+It takes the same options as its parent. It also requires an
+additional option, C<type_constraints>. This is an array reference
+containing the L<Moose::Meta::TypeConstraint> objects that are the
+members of the union type. The C<name> option defaults to the names
+all of these member types sorted and then joined by a pipe (|).
-=item B<includes_type>
+The constructor sets the implementation of the constraint so that is
+simply calls C<check> on the newly created object.
-=item B<equals>
+Finally, the constructor also makes sure that the object's C<coercion>
+attribute is a L<Moose::Meta::TypeCoercion::Union> object.
-=back
-
-=head2 Overriden methods
-
-=over 4
+=item B<< $constraint->type_constraints >>
-=item B<check>
+This returns the array reference of C<type_constraints> provided to
+the constructor.
-=item B<coerce>
+=item B<< $constraint->parent >>
-=item B<validate>
+This returns the nearest common ancestor of all the components of the union.
-=item B<is_a_type_of>
+=item B<< $constraint->check($value) >>
-=item B<is_subtype_of>
+=item B<< $constraint->validate($value) >>
-=back
+These two methods simply call the relevant method on each of the
+member type constraints in the union. If any type accepts the value,
+the value is valid.
-=head2 Empty or Stub methods
+With C<validate> the error message returned includes all of the error
+messages returned by the member type constraints.
-These methods tend to not be very relevant in
-the context of a union. Either that or they are
-just difficult to specify and not very useful
-anyway. They are here for completeness.
+=item B<< $constraint->equals($type_name_or_object) >>
-=over 4
+A type is considered equal if it is also a union type, and the two
+unions have the same member types.
-=item B<parent>
+=item B<< $constraint->find_type_for($value) >>
-=item B<coercion>
+This returns the first member type constraint for which C<check($value)> is
+true, allowing you to determine which of the Union's member type constraints
+a given value matches.
-=item B<has_coercion>
+=item B<< $constraint->is_a_type_of($type_name_or_object) >>
-=item B<message>
+This returns true if all of the member type constraints return true
+for the C<is_a_type_of> method.
-=item B<has_message>
+=item B<< $constraint->is_subtype_of >>
-=item B<hand_optimized_type_constraint>
+This returns true if all of the member type constraints return true
+for the C<is_a_subtype_of> method.
-=item B<has_hand_optimized_type_constraint>
+=item B<< $constraint->create_child_type(%options) >>
-=item B<create_child_type>
+This returns a new L<Moose::Meta::TypeConstraint> object with the type
+as its parent.
=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 2006-2008 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.
+See L<Moose/BUGS> for details on reporting bugs.
=cut
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