X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FTypeConstraint%2FClass.pm;h=bbd4c2eca0908957d56f3bd0f9a73aa83572c1b1;hb=9e4ed568f2e5c1041e6fea8d0cbde420562ab5df;hp=5569cc53c607d28f99ab06f560cba0e84baf263e;hpb=3fef8ce8cbb223d6edec5f444a51a5af6c82ab69;p=gitmo%2FMoose.git

diff --git a/lib/Moose/Meta/TypeConstraint/Class.pm b/lib/Moose/Meta/TypeConstraint/Class.pm
index 5569cc5..bbd4c2e 100644
--- a/lib/Moose/Meta/TypeConstraint/Class.pm
+++ b/lib/Moose/Meta/TypeConstraint/Class.pm
@@ -4,76 +4,206 @@ use strict;
 use warnings;
 use metaclass;
 
-use Scalar::Util qw(blessed);
+use Scalar::Util 'blessed';
+use Moose::Util::TypeConstraints ();
+
+our $VERSION   = '0.84';
+$VERSION = eval $VERSION;
+our $AUTHORITY = 'cpan:STEVAN';
 
 use base 'Moose::Meta::TypeConstraint';
 
-use Moose::Util::TypeConstraints ();
+__PACKAGE__->meta->add_attribute('class' => (
+    reader => 'class',
+));
 
 sub new {
-    my $class = shift;
-    my $self  = $class->meta->new_object(@_, parent => Moose::Util::TypeConstraints::find_type_constraint('Object') );
-    $self->compile_type_constraint()
-        unless $self->_has_compiled_type_constraint;
+    my ( $class, %args ) = @_;
+
+    $args{parent} = Moose::Util::TypeConstraints::find_type_constraint('Object');
+    my $self      = $class->_new(\%args);
+
+    $self->_create_hand_optimized_type_constraint;
+    $self->compile_type_constraint();
+
     return $self;
 }
 
+sub _create_hand_optimized_type_constraint {
+    my $self = shift;
+    my $class = $self->class;
+    $self->hand_optimized_type_constraint(
+        sub {
+            blessed( $_[0] ) && $_[0]->isa($class)
+        }
+    );
+}
+
 sub parents {
     my $self = shift;
     return (
         $self->parent,
-        map { Moose::Util::TypeConstraints::find_type_constraint($_) } $self->name->meta->superclasses,
+        map {
+            # FIXME find_type_constraint might find a TC named after the class but that isn't really it
+            # I did this anyway since it's a convention that preceded TypeConstraint::Class, and it should DWIM
+            # if anybody thinks this problematic please discuss on IRC.
+            # a possible fix is to add by attr indexing to the type registry to find types of a certain property
+            # regardless of their name
+            Moose::Util::TypeConstraints::find_type_constraint($_)
+                ||
+            __PACKAGE__->new( class => $_, name => "__ANON__" )
+        } Class::MOP::class_of($self->class)->superclasses,
     );
 }
 
-sub hand_optimized_type_constraint {
-    my $self = shift;
-    my $class = $self->name;
-    sub { blessed( $_[0] ) && $_[0]->isa($class) }
-}
+sub equals {
+    my ( $self, $type_or_name ) = @_;
 
-sub has_hand_optimized_type_constraint { 1 }
+    my $other = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+
+    return unless defined $other;
+    return unless $other->isa(__PACKAGE__);
+
+    return $self->class eq $other->class;
+}
 
 sub is_a_type_of {
-    my ($self, $type_name) = @_;
+    my ($self, $type_or_name) = @_;
 
-    return $self->name eq $type_name || $self->is_subtype_of($type_name);
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name);
+
+    ($self->equals($type) || $self->is_subtype_of($type_or_name));
 }
 
 sub is_subtype_of {
-    my ($self, $type_name) = @_;
+    my ($self, $type_or_name_or_class ) = @_;
+
+    if ( not ref $type_or_name_or_class ) {
+        # it might be a class
+        return 1 if $self->class->isa( $type_or_name_or_class );
+    }
+
+    my $type = Moose::Util::TypeConstraints::find_type_constraint($type_or_name_or_class);
+
+    return unless defined $type;
+
+    if ( $type->isa(__PACKAGE__) ) {
+        # if $type_or_name_or_class isn't a class, it might be the TC name of another ::Class type
+        # or it could also just be a type object in this branch
+        return $self->class->isa( $type->class );
+    } else {
+        # the only other thing we are a subtype of is Object
+        $self->SUPER::is_subtype_of($type);
+    }
+}
+
+# This is a bit counter-intuitive, but a child type of a Class type
+# constraint is not itself a Class type constraint (it has no class
+# attribute). This whole create_child_type thing needs some changing
+# though, probably making MMC->new a factory or something.
+sub create_child_type {
+    my ($self, @args) = @_;
+    return Moose::Meta::TypeConstraint->new(@args, parent => $self);
+}
+
+sub get_message {
+    my $self = shift;
+    my ($value) = @_;
+
+    if ($self->has_message) {
+        return $self->SUPER::get_message(@_);
+    }
 
-    return 1 if $type_name eq 'Object';
-    return $self->name->isa( $type_name );
+    $value = (defined $value ? overload::StrVal($value) : 'undef');
+    return "Validation failed for '" . $self->name . "' failed with value $value (not isa " . $self->class . ")";
 }
 
 1;
 
 __END__
+
 =pod
 
 =head1 NAME
 
 Moose::Meta::TypeConstraint::Class - Class/TypeConstraint parallel hierarchy
 
+=head1 DESCRIPTION
+
+This class represents type constraints for a class.
+
+=head1 INHERITANCE
+
+C<Moose::Meta::TypeConstraint::Class> is a subclass of
+L<Moose::Meta::TypeConstraint>.
+
 =head1 METHODS
 
 =over 4
 
-=item new
+=item B<< Moose::Meta::TypeConstraint::Class->new(%options) >>
+
+This creates a new class type constraint based on the given
+C<%options>.
+
+It takes the same options as its parent, with two exceptions. First,
+it requires an additional option, C<class>, which is name of the
+constraint's class.  Second, it automatically sets the parent to the
+C<Object> type.
+
+The constructor also overrides the hand optimized type constraint with
+one it creates internally.
+
+=item B<< $constraint->class >>
+
+Returns the class name associated with the constraint.
 
-=item hand_optimized_type_constraint
+=item B<< $constraint->parents >>
 
-=item has_hand_optimized_type_constraint
+Returns all the type's parent types, corresponding to its parent
+classes.
 
-=item is_a_type_of
+=item B<< $constraint->is_subtype_of($type_name_or_object) >>
 
-=item is_subtype_of
+If the given type is also a class type, then this checks that the
+type's class is a subclass of the other type's class.
 
-=item parents
+Otherwise it falls back to the implementation in
+L<Moose::Meta::TypeConstraint>.
 
-Return all the parent types, corresponding to the parent classes.
+=item B<< $constraint->create_child_type(%options) >>
+
+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::Class> object!
+
+=item B<< $constraint->get_message($value) >>
+
+This is the same as L<Moose::Meta::TypeConstraint/get_message> except
+that it explicitly says C<isa> was checked. This is to help users deal
+with accidentally autovivified type constraints.
 
 =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
+
+Yuval Kogman E<lt>nothingmuch@cpan.orgE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2006-2009 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