X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMoose%2FMeta%2FTypeConstraint%2FParameterizable.pm;h=c85e6af4d76a6049bea2885b6331320ba21c37ed;hb=d344c3feeb1c99183a249e26ddfb0e790101f7b2;hp=19d7d65ff16be67c793ed6873ea723b7016dccaf;hpb=75b9541431131c67521bd1ec75df80c9707bd719;p=gitmo%2FMoose.git

diff --git a/lib/Moose/Meta/TypeConstraint/Parameterizable.pm b/lib/Moose/Meta/TypeConstraint/Parameterizable.pm
index 19d7d65..c85e6af 100644
--- a/lib/Moose/Meta/TypeConstraint/Parameterizable.pm
+++ b/lib/Moose/Meta/TypeConstraint/Parameterizable.pm
@@ -4,11 +4,13 @@ use strict;
 use warnings;
 use metaclass;
 
-our $VERSION   = '0.55_01';
+our $VERSION   = '0.68';
 $VERSION = eval $VERSION;
 our $AUTHORITY = 'cpan:STEVAN';
 
 use base 'Moose::Meta::TypeConstraint';
+use Moose::Meta::TypeConstraint::Parameterized;
+use Moose::Util::TypeConstraints ();
 
 __PACKAGE__->meta->add_attribute('constraint_generator' => (
     accessor  => 'constraint_generator',
@@ -40,6 +42,39 @@ sub _can_coerce_constraint_from {
     };
 }
 
+sub _parse_type_parameter {
+    my ($self, $type_parameter) = @_;
+    return Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($type_parameter);
+}
+
+sub parameterize {
+    my ($self, $type_parameter) = @_;
+
+    my $contained_tc = $self->_parse_type_parameter($type_parameter);
+    
+    ## The type parameter should be a subtype of the parent's type parameter
+    ## if there is one.
+    
+    if(my $parent = $self->parent) {
+        if($parent->can('type_parameter')) {
+            $contained_tc->is_a_type_of($parent->type_parameter)
+             || Moose->throw_error("$type_parameter is not a subtype of ".$parent->type_parameter);
+        }
+    }
+
+    if ( $contained_tc->isa('Moose::Meta::TypeConstraint') ) {
+        my $tc_name = $self->name . '[' . $contained_tc->name . ']';
+        return Moose::Meta::TypeConstraint::Parameterized->new(
+            name           => $tc_name,
+            parent         => $self,
+            type_parameter => $contained_tc,
+        );
+    }
+    else {
+        Moose->throw_error("The type parameter must be a Moose meta type");
+    }
+}
+
 
 1;
 
@@ -62,6 +97,11 @@ Moose::Meta::TypeConstraint::Parameterizable - Higher Order type constraints for
 
 =item B<generate_constraint_for>
 
+=item B<parameterize>
+
+Given a single type constraint or type constraint string, this method
+parameterizes the type based on the given argument.
+
 =item B<meta>
 
 =back
@@ -78,7 +118,7 @@ Stevan Little E<lt>stevan@iinteractive.comE<gt>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2006-2008 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
 
 L<http://www.iinteractive.com>