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-rw-r--r--lib/Moose/Meta/Role/Application/ToRole.pm283
1 files changed, 283 insertions, 0 deletions
diff --git a/lib/Moose/Meta/Role/Application/ToRole.pm b/lib/Moose/Meta/Role/Application/ToRole.pm
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+package Moose::Meta::Role::Application::ToRole;
+our $VERSION = '2.1405';
+
+use strict;
+use warnings;
+use metaclass;
+
+use parent 'Moose::Meta::Role::Application';
+
+use Moose::Util 'throw_exception';
+
+sub apply {
+ my ($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) ) {
+ throw_exception( ConflictDetectedInCheckRoleExclusions => role_name => $role2->name,
+ excluded_role_name => $role1->name,
+ );
+ }
+ foreach my $excluded_role_name ($role1->get_excluded_roles_list) {
+ if ( $role2->does_role($excluded_role_name) ) {
+ throw_exception( RoleDoesTheExcludedRole => role_name => $role2->name,
+ excluded_role_name => $excluded_role_name,
+ second_role_name => $role1->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)) {
+
+ my $role2_name = $role2->name;
+
+ throw_exception( AttributeConflictInRoles => role_name => $role1->name,
+ second_role_name => $role2->name,
+ attribute_name => $attribute_name
+ );
+ }
+ else {
+ $role2->add_attribute(
+ $role1->get_attribute($attribute_name)->clone
+ );
+ }
+ }
+}
+
+sub apply_methods {
+ my ( $self, $role1, $role2 ) = @_;
+ foreach my $method ( $role1->_get_local_methods ) {
+
+ my $method_name = $method->name;
+
+ next if $method->isa('Class::MOP::Method::Meta');
+
+ unless ( $self->is_method_excluded($method_name) ) {
+
+ my $role2_method = $role2->get_method($method_name);
+ if ( $role2_method
+ && $role2_method->body != $method->body ) {
+
+ # method conflicts between roles used to result in the method
+ # becoming a requirement but now are permitted just like
+ # for classes, hence no code in this branch anymore.
+ }
+ else {
+ $role2->add_method(
+ $method_name,
+ $method,
+ );
+ }
+ }
+
+ next unless $self->is_method_aliased($method_name);
+
+ my $aliased_method_name = $self->get_method_aliases->{$method_name};
+
+ my $role2_method = $role2->get_method($aliased_method_name);
+
+ if ( $role2_method
+ && $role2_method->body != $method->body ) {
+
+ throw_exception( CannotCreateMethodAliasLocalMethodIsPresent => aliased_method_name => $aliased_method_name,
+ method => $method,
+ role_name => $role2->name,
+ role_being_applied_name => $role1->name,
+ );
+ }
+
+ $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);
+ }
+ }
+}
+
+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
+ throw_exception( OverrideConflictInComposition => role_name => $role2->name,
+ role_being_applied_name => $role1->name,
+ method_name => $method_name
+ );
+ }
+ else {
+ # if we are a role, we need to make sure
+ # we don't have a conflict with the role
+ # we are composing into
+ if ($role2->has_override_method_modifier($method_name) &&
+ $role1->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) {
+
+ throw_exception( OverrideConflictInComposition => role_name => $role2->name,
+ role_being_applied_name => $role1->name,
+ method_name => $method_name,
+ two_overrides_found => 1
+ );
+ }
+ 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;
+
+# ABSTRACT: Compose a role into another role
+
+__END__
+
+=pod
+
+=encoding UTF-8
+
+=head1 NAME
+
+Moose::Meta::Role::Application::ToRole - Compose a role into another role
+
+=head1 VERSION
+
+version 2.1405
+
+=head1 DESCRIPTION
+
+=head2 METHODS
+
+=over 4
+
+=item B<new>
+
+=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
+
+See L<Moose/BUGS> for details on reporting bugs.
+
+=head1 AUTHORS
+
+=over 4
+
+=item *
+
+Stevan Little <stevan.little@iinteractive.com>
+
+=item *
+
+Dave Rolsky <autarch@urth.org>
+
+=item *
+
+Jesse Luehrs <doy@tozt.net>
+
+=item *
+
+Shawn M Moore <code@sartak.org>
+
+=item *
+
+יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
+
+=item *
+
+Karen Etheridge <ether@cpan.org>
+
+=item *
+
+Florian Ragwitz <rafl@debian.org>
+
+=item *
+
+Hans Dieter Pearcey <hdp@weftsoar.net>
+
+=item *
+
+Chris Prather <chris@prather.org>
+
+=item *
+
+Matt S Trout <mst@shadowcat.co.uk>
+
+=back
+
+=head1 COPYRIGHT AND LICENSE
+
+This software is copyright (c) 2006 by Infinity Interactive, Inc..
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+=cut
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