package MooseX::Meta::TypeConstraint::Role::Structured;
use Moose::Role;
-use Moose::Util::TypeConstraints;
=head1 NAME
=head1 DESCRIPTION
-Structured type constraints let you assign an internal pattern of type
-constraints to a 'container' constraint. The goal is to make it easier to
-declare constraints like "ArrayRef[Int, Int, Str]" where the constraint is an
-ArrayRef of three elements and the internal constraint on the three is Int, Int
-and Str.
-
-To accomplish this, we add an attribute to the base L<Moose::Meta::TypeConstraint>
-to hold a L</signature>, which is a reference to a pattern of type constraints.
-We then override L</constraint> to check our incoming value to the attribute
-against this signature pattern.
-
-=head1 SUBTYPES
-
-The following subtypes and coercions are defined in this class.
-
-=head2 MooseX::Meta::TypeConstraint::Structured::Signature
-
-This is a type constraint to normalize the incoming L</signature>. We want
-everything as a HashRef in the end.
-
-=cut
-
-subtype 'MooseX::Meta::TypeConstraint::Structured::Signature',
- as 'HashRef[Object]',
- where {
- my %signature = %$_;
- foreach my $key (keys %signature) {
- $signature{$key}->isa('Moose::Meta::TypeConstraint');
- } 1;
- };
-
-coerce 'MooseX::Meta::TypeConstraint::Structured::Signature',
- from 'ArrayRef[Object]',
- via {
- my @signature = @$_;
- my %hashed_signature = map { $_ => $signature[$_] } 0..$#signature;
- \%hashed_signature;
- };
+STUB - TBD
=head1 ATTRIBUTES
has 'signature' => (
is=>'ro',
- isa=>'MooseX::Meta::TypeConstraint::Structured::Signature',
- coerce=>1,
+ isa=>'Ref',
required=>1,
);
=cut
-sub _normalize_args {
- my ($self, $args) = @_;
- if(defined $args) {
- if(ref $args eq 'ARRAY') {
- return map { $_ => $args->[$_] } (0..$#$args);
- } elsif (ref $args eq 'HASH') {
- return %$args;
- } else {
- confess 'Signature must be a reference';
- }
- } else {
- confess 'Signature cannot be empty';
- }
-}
=head2 constraint
=cut
-sub constraint {
- my $self = shift;
- return sub {
- my %args = $self->_normalize_args(shift);
- foreach my $idx (keys %{$self->signature}) {
- my $type_constraint = $self->signature->{$idx};
- if(my $error = $type_constraint->validate($args{$idx})) {
- confess $error;
- }
- } 1;
- };
-}
-
=head2 equals
modifier to make sure equals descends into the L</signature>
=cut
-around 'equals' => sub {
- my ($equals, $self, $compared_type_constraint) = @_;
-
- ## Make sure we are comparing typeconstraints of the same base class
- return unless $compared_type_constraint->isa(__PACKAGE__);
-
- ## Make sure the base equals is also good
- return unless $self->$equals($compared_type_constraint);
-
- ## Make sure the signatures match
- return unless $self->signature_equals($compared_type_constraint);
-
- ## If we get this far, the two are equal
- return 1;
-};
-
=head2 signature_equals
Check that the signature equals another signature.
=cut
-sub signature_equals {
- my ($self, $compared_type_constraint) = @_;
-
- foreach my $idx (keys %{$self->signature}) {
- my $this = $self->signature->{$idx};
- my $that = $compared_type_constraint->signature->{$idx};
- return unless $this->equals($that);
- }
-
- return 1;
-}
-
=head1 AUTHOR
John James Napiorkowski <jjnapiork@cpan.org>
=cut
-no Moose; 1;
+1;