1 package Moose::Meta::Role::Application::ToRole;
8 use Scalar::Util 'blessed';
12 our $VERSION = '0.01';
13 our $AUTHORITY = 'cpan:STEVAN';
15 use base 'Moose::Meta::Role::Application';
18 my ($self, $role1, $role2) = @_;
19 $self->SUPER::apply($role1, $role2);
20 $role2->add_role($role1);
23 sub check_role_exclusions {
24 my ($self, $role1, $role2) = @_;
25 confess "Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'"
26 if $role2->excludes_role($role1->name);
27 foreach my $excluded_role_name ($role1->get_excluded_roles_list) {
28 confess "The class " . $role2->name . " does the excluded role '$excluded_role_name'"
29 if $role2->does_role($excluded_role_name);
30 $role2->add_excluded_roles($excluded_role_name);
34 sub check_required_methods {
35 my ($self, $role1, $role2) = @_;
36 foreach my $required_method_name ($role1->get_required_method_list) {
37 $role2->add_required_methods($required_method_name)
38 unless $role2->find_method_by_name($required_method_name);
42 sub check_required_attributes {
46 sub apply_attributes {
47 my ($self, $role1, $role2) = @_;
48 foreach my $attribute_name ($role1->get_attribute_list) {
49 # it if it has one already
50 if ($role2->has_attribute($attribute_name) &&
51 # make sure we haven't seen this one already too
52 $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) {
53 confess "Role '" . $role1->name . "' has encountered an attribute conflict " .
54 "during composition. This is fatal error and cannot be disambiguated.";
57 $role2->add_attribute(
59 $role1->get_attribute($attribute_name)
66 my ($self, $role1, $role2) = @_;
67 foreach my $method_name ($role1->get_method_list) {
68 # it if it has one already
69 if ($role2->has_method($method_name) &&
70 # and if they are not the same thing ...
71 $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) {
72 # method conflicts between roles result
73 # in the method becoming a requirement
74 $role2->add_required_methods($method_name);
77 # add it, although it could be overriden
80 $role1->get_method($method_name)
86 sub apply_override_method_modifiers {
87 my ($self, $role1, $role2) = @_;
88 foreach my $method_name ($role1->get_method_modifier_list('override')) {
89 # it if it has one already then ...
90 if ($role2->has_method($method_name)) {
91 # if it is being composed into another role
92 # we have a conflict here, because you cannot
93 # combine an overriden method with a locally
95 confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " .
96 "during composition (A local method of the same name as been found). This " .
100 # if we are a role, we need to make sure
101 # we dont have a conflict with the role
102 # we are composing into
103 if ($role2->has_override_method_modifier($method_name) &&
104 $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) {
105 confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " .
106 "during composition (Two 'override' methods of the same name encountered). " .
107 "This is fatal error.";
110 # if there is no conflict,
111 # just add it to the role
112 $role2->add_override_method_modifier(
114 $role1->get_override_method_modifier($method_name)
121 sub apply_method_modifiers {
122 my ($self, $modifier_type, $role1, $role2) = @_;
123 my $add = "add_${modifier_type}_method_modifier";
124 my $get = "get_${modifier_type}_method_modifiers";
125 foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) {
129 ) foreach $role1->$get($method_name);
142 Moose::Meta::Role::Application::ToRole
156 =item B<check_role_exclusions>
158 =item B<check_required_methods>
160 =item B<check_required_attributes>
162 =item B<apply_attributes>
164 =item B<apply_methods>
166 =item B<apply_method_modifiers>
168 =item B<apply_override_method_modifiers>
174 All complex software has bugs lurking in it, and this module is no
175 exception. If you find a bug please either email me, or add the bug
180 Stevan Little E<lt>stevan@iinteractive.comE<gt>
182 =head1 COPYRIGHT AND LICENSE
184 Copyright 2006-2008 by Infinity Interactive, Inc.
186 L<http://www.iinteractive.com>
188 This library is free software; you can redistribute it and/or modify
189 it under the same terms as Perl itself.