use warnings;
use metaclass;
-use Carp 'confess';
use Scalar::Util 'blessed';
-use Data::Dumper;
-
-our $VERSION = '0.01';
+our $VERSION = '0.81';
+$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';
use base 'Moose::Meta::Role::Application';
+sub apply {
+ my ($self, $role1, $role2) = @_;
+ $self->SUPER::apply($role1, $role2);
+ $role2->add_role($role1);
+}
+
+sub check_role_exclusions {
+ my ($self, $role1, $role2) = @_;
+ if ( $role2->excludes_role($role1->name) ) {
+ require Moose;
+ Moose->throw_error("Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'");
+ }
+ foreach my $excluded_role_name ($role1->get_excluded_roles_list) {
+ if ( $role2->does_role($excluded_role_name) ) {
+ require Moose;
+ Moose->throw_error("The class " . $role2->name . " does the excluded role '$excluded_role_name'");
+ }
+ $role2->add_excluded_roles($excluded_role_name);
+ }
+}
+
+sub check_required_methods {
+ my ($self, $role1, $role2) = @_;
+ foreach my $required_method ($role1->get_required_method_list) {
+ my $required_method_name = $required_method->name;
+
+ next if $self->is_aliased_method($required_method_name);
+
+ $role2->add_required_methods($required_method)
+ unless $role2->find_method_by_name($required_method_name);
+ }
+}
+
+sub check_required_attributes {
+
+}
+
+sub apply_attributes {
+ my ($self, $role1, $role2) = @_;
+ foreach my $attribute_name ($role1->get_attribute_list) {
+ # it if it has one already
+ if ($role2->has_attribute($attribute_name) &&
+ # make sure we haven't seen this one already too
+ $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) {
+
+ require Moose;
+ Moose->throw_error("Role '" . $role1->name . "' has encountered an attribute conflict " .
+ "during composition. This is fatal error and cannot be disambiguated.");
+ }
+ else {
+ $role2->add_attribute(
+ $attribute_name,
+ $role1->get_attribute($attribute_name)
+ );
+ }
+ }
+}
+
+sub apply_methods {
+ my ($self, $role1, $role2) = @_;
+ foreach my $method_name ($role1->get_method_list) {
+
+ if ($self->is_method_aliased($method_name)) {
+ my $aliased_method_name = $self->get_method_aliases->{$method_name};
+ # it if it has one already
+ if ($role2->has_method($aliased_method_name) &&
+ # and if they are not the same thing ...
+ $role2->get_method($aliased_method_name)->body != $role1->get_method($method_name)->body) {
+
+ require Moose;
+ Moose->throw_error("Cannot create a method alias if a local method of the same name exists");
+ }
+
+ $role2->add_method(
+ $aliased_method_name,
+ $role1->get_method($method_name)
+ );
+
+ if (!$role2->has_method($method_name)) {
+ $role2->add_required_methods($method_name)
+ unless $self->is_method_excluded($method_name);
+ }
+
+ next;
+ }
+
+ next if $self->is_method_excluded($method_name);
+
+ # it if it has one already
+ if ($role2->has_method($method_name) &&
+ # and if they are not the same thing ...
+ $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) {
+ # method conflicts between roles result
+ # in the method becoming a requirement
+ $role2->add_conflicting_method(
+ name => $method_name,
+ roles => [$role1->name, $role2->name],
+ );
+ }
+ else {
+ # add it, although it could be overridden
+ $role2->add_method(
+ $method_name,
+ $role1->get_method($method_name)
+ );
+
+ }
+
+ }
+}
+
+sub apply_override_method_modifiers {
+ my ($self, $role1, $role2) = @_;
+ foreach my $method_name ($role1->get_method_modifier_list('override')) {
+ # it if it has one already then ...
+ if ($role2->has_method($method_name)) {
+ # if it is being composed into another role
+ # we have a conflict here, because you cannot
+ # combine an overridden method with a locally
+ # defined one
+ require Moose;
+ Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " .
+ "during composition (A local method of the same name as been found). This " .
+ "is fatal error.");
+ }
+ else {
+ # if we are a role, we need to make sure
+ # we dont have a conflict with the role
+ # we are composing into
+ if ($role2->has_override_method_modifier($method_name) &&
+ $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) {
+
+ require Moose;
+ Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " .
+ "during composition (Two 'override' methods of the same name encountered). " .
+ "This is fatal error.");
+ }
+ else {
+ # if there is no conflict,
+ # just add it to the role
+ $role2->add_override_method_modifier(
+ $method_name,
+ $role1->get_override_method_modifier($method_name)
+ );
+ }
+ }
+ }
+}
+
+sub apply_method_modifiers {
+ my ($self, $modifier_type, $role1, $role2) = @_;
+ my $add = "add_${modifier_type}_method_modifier";
+ my $get = "get_${modifier_type}_method_modifiers";
+ foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) {
+ $role2->$add(
+ $method_name,
+ $_
+ ) foreach $role1->$get($method_name);
+ }
+}
+
+
1;
__END__
=head1 NAME
-Moose::Meta::Role::Application::ToRole
+Moose::Meta::Role::Application::ToRole - Compose a role into another role
=head1 DESCRIPTION
=item B<meta>
+=item B<apply>
+
+=item B<check_role_exclusions>
+
+=item B<check_required_methods>
+
+=item B<check_required_attributes>
+
+=item B<apply_attributes>
+
+=item B<apply_methods>
+
+=item B<apply_method_modifiers>
+
+=item B<apply_override_method_modifiers>
+
=back
=head1 BUGS
=head1 COPYRIGHT AND LICENSE
-Copyright 2006, 2007 by Infinity Interactive, Inc.
+Copyright 2006-2009 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
projects / gitmo/Moose.git / blobdiff