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mschuepbach
283
CPAN/Moose/Meta/Role/Application/ToRole.pm
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283
CPAN/Moose/Meta/Role/Application/ToRole.pm
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package Moose::Meta::Role::Application::ToRole;
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our $VERSION = '2.2207';
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use strict;
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use warnings;
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use metaclass;
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use parent 'Moose::Meta::Role::Application';
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use Moose::Util 'throw_exception';
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sub apply {
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my ($self, $role1, $role2) = @_;
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$self->SUPER::apply($role1, $role2);
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$role2->add_role($role1);
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}
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sub check_role_exclusions {
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my ($self, $role1, $role2) = @_;
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if ( $role2->excludes_role($role1->name) ) {
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throw_exception( ConflictDetectedInCheckRoleExclusions => role_name => $role2->name,
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excluded_role_name => $role1->name,
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);
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}
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foreach my $excluded_role_name ($role1->get_excluded_roles_list) {
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if ( $role2->does_role($excluded_role_name) ) {
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throw_exception( RoleDoesTheExcludedRole => role_name => $role2->name,
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excluded_role_name => $excluded_role_name,
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second_role_name => $role1->name,
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);
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}
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$role2->add_excluded_roles($excluded_role_name);
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}
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}
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sub check_required_methods {
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my ($self, $role1, $role2) = @_;
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foreach my $required_method ($role1->get_required_method_list) {
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my $required_method_name = $required_method->name;
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next if $self->is_aliased_method($required_method_name);
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$role2->add_required_methods($required_method)
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unless $role2->find_method_by_name($required_method_name);
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}
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}
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sub check_required_attributes {
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}
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sub apply_attributes {
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my ($self, $role1, $role2) = @_;
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foreach my $attribute_name ($role1->get_attribute_list) {
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# it if it has one already
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if ($role2->has_attribute($attribute_name) &&
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# make sure we haven't seen this one already too
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$role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) {
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my $role2_name = $role2->name;
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throw_exception( AttributeConflictInRoles => role_name => $role1->name,
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second_role_name => $role2->name,
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attribute_name => $attribute_name
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);
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}
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else {
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$role2->add_attribute(
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$role1->get_attribute($attribute_name)->clone
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);
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}
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}
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}
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sub apply_methods {
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my ( $self, $role1, $role2 ) = @_;
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foreach my $method ( $role1->_get_local_methods ) {
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my $method_name = $method->name;
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next if $method->isa('Class::MOP::Method::Meta');
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unless ( $self->is_method_excluded($method_name) ) {
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my $role2_method = $role2->get_method($method_name);
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if ( $role2_method
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&& $role2_method->body != $method->body ) {
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# method conflicts between roles used to result in the method
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# becoming a requirement but now are permitted just like
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# for classes, hence no code in this branch anymore.
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}
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else {
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$role2->add_method(
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$method_name,
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$method,
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);
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}
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}
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next unless $self->is_method_aliased($method_name);
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my $aliased_method_name = $self->get_method_aliases->{$method_name};
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my $role2_method = $role2->get_method($aliased_method_name);
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if ( $role2_method
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&& $role2_method->body != $method->body ) {
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throw_exception( CannotCreateMethodAliasLocalMethodIsPresent => aliased_method_name => $aliased_method_name,
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method => $method,
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role_name => $role2->name,
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role_being_applied_name => $role1->name,
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);
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}
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$role2->add_method(
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$aliased_method_name,
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$role1->get_method($method_name)
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);
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if ( !$role2->has_method($method_name) ) {
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$role2->add_required_methods($method_name)
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unless $self->is_method_excluded($method_name);
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}
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}
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}
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sub apply_override_method_modifiers {
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my ($self, $role1, $role2) = @_;
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foreach my $method_name ($role1->get_method_modifier_list('override')) {
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# it if it has one already then ...
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if ($role2->has_method($method_name)) {
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# if it is being composed into another role
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# we have a conflict here, because you cannot
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# combine an overridden method with a locally
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# defined one
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throw_exception( OverrideConflictInComposition => role_name => $role2->name,
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role_being_applied_name => $role1->name,
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method_name => $method_name
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);
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}
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else {
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# if we are a role, we need to make sure
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# we don't have a conflict with the role
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# we are composing into
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if ($role2->has_override_method_modifier($method_name) &&
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$role1->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) {
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throw_exception( OverrideConflictInComposition => role_name => $role2->name,
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role_being_applied_name => $role1->name,
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method_name => $method_name,
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two_overrides_found => 1
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);
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}
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else {
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# if there is no conflict,
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# just add it to the role
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$role2->add_override_method_modifier(
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$method_name,
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$role1->get_override_method_modifier($method_name)
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);
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}
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}
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}
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}
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sub apply_method_modifiers {
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my ($self, $modifier_type, $role1, $role2) = @_;
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my $add = "add_${modifier_type}_method_modifier";
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my $get = "get_${modifier_type}_method_modifiers";
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foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) {
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$role2->$add(
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$method_name,
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$_
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) foreach $role1->$get($method_name);
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}
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}
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1;
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# ABSTRACT: Compose a role into another role
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__END__
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=pod
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=encoding UTF-8
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=head1 NAME
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Moose::Meta::Role::Application::ToRole - Compose a role into another role
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=head1 VERSION
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version 2.2207
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=head1 DESCRIPTION
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=head2 METHODS
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=over 4
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=item B<new>
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=item B<meta>
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=item B<apply>
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=item B<check_role_exclusions>
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=item B<check_required_methods>
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=item B<check_required_attributes>
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=item B<apply_attributes>
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=item B<apply_methods>
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=item B<apply_method_modifiers>
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=item B<apply_override_method_modifiers>
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=back
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=head1 BUGS
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See L<Moose/BUGS> for details on reporting bugs.
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=head1 AUTHORS
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=over 4
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=item *
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Stevan Little <stevan@cpan.org>
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=item *
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Dave Rolsky <autarch@urth.org>
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=item *
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Jesse Luehrs <doy@cpan.org>
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=item *
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Shawn M Moore <sartak@cpan.org>
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=item *
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יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
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=item *
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Karen Etheridge <ether@cpan.org>
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=item *
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Florian Ragwitz <rafl@debian.org>
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=item *
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Hans Dieter Pearcey <hdp@cpan.org>
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=item *
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Chris Prather <chris@prather.org>
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=item *
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Matt S Trout <mstrout@cpan.org>
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=back
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=head1 COPYRIGHT AND LICENSE
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This software is copyright (c) 2006 by Infinity Interactive, Inc.
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This is free software; you can redistribute it and/or modify it under
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the same terms as the Perl 5 programming language system itself.
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=cut
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