1 package Moose::Meta::Role::Application::RoleSummation;
7 use Scalar::Util 'blessed';
9 use Moose::Meta::Role::Composite;
11 our $VERSION = '0.73';
12 $VERSION = eval $VERSION;
13 our $AUTHORITY = 'cpan:STEVAN';
15 use base 'Moose::Meta::Role::Application';
17 __PACKAGE__->meta->add_attribute('role_params' => (
18 reader => 'role_params',
22 sub get_exclusions_for_role {
23 my ($self, $role) = @_;
24 $role = $role->name if blessed $role;
25 if ($self->role_params->{$role} && defined $self->role_params->{$role}->{excludes}) {
26 if (ref $self->role_params->{$role}->{excludes} eq 'ARRAY') {
27 return $self->role_params->{$role}->{excludes};
29 return [ $self->role_params->{$role}->{excludes} ];
34 sub get_method_aliases_for_role {
35 my ($self, $role) = @_;
36 $role = $role->name if blessed $role;
37 if ($self->role_params->{$role} && defined $self->role_params->{$role}->{alias}) {
38 return $self->role_params->{$role}->{alias};
43 sub is_method_excluded {
44 my ($self, $role, $method_name) = @_;
45 foreach ($self->get_exclusions_for_role($role->name)) {
46 return 1 if $_ eq $method_name;
51 sub is_method_aliased {
52 my ($self, $role, $method_name) = @_;
53 exists $self->get_method_aliases_for_role($role->name)->{$method_name} ? 1 : 0
56 sub is_aliased_method {
57 my ($self, $role, $method_name) = @_;
58 my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)};
59 exists $aliased_names{$method_name} ? 1 : 0;
62 # stolen from List::MoreUtils ...
63 my $uniq = sub { my %h; map { $h{$_}++ == 0 ? $_ : () } @_ };
65 sub check_role_exclusions {
69 for my $role (@{ $c->get_roles }) {
70 my $name = $role->name;
72 for my $excluded ($role->get_excluded_roles_list) {
73 push @{ $excluded_roles{$excluded} }, $name;
77 foreach my $role (@{$c->get_roles}) {
78 foreach my $excluded (keys %excluded_roles) {
79 next unless $role->does_role($excluded);
81 my @excluding = @{ $excluded_roles{$excluded} };
84 Moose->throw_error(sprintf "Conflict detected: Role%s %s exclude%s role '%s'", (@excluding == 1 ? '' : 's'), join(', ', @excluding), (@excluding == 1 ? 's' : ''), $excluded);
88 $c->add_excluded_roles(keys %excluded_roles);
91 sub check_required_methods {
94 my %all_required_methods = map { $_ => undef } $uniq->(map {
95 $_->get_required_method_list
98 foreach my $role (@{$c->get_roles}) {
99 foreach my $required (keys %all_required_methods) {
101 delete $all_required_methods{$required}
102 if $role->has_method($required)
103 || $self->is_aliased_method($role, $required);
107 $c->add_required_methods(keys %all_required_methods);
110 sub check_required_attributes {
114 sub apply_attributes {
117 my @all_attributes = map {
122 attr => $role->get_attribute($_),
124 } $role->get_attribute_list
128 foreach my $attr (@all_attributes) {
129 if (exists $seen{$attr->{name}}) {
130 if ( $seen{$attr->{name}} != $attr->{attr} ) {
132 Moose->throw_error("We have encountered an attribute conflict with '" . $attr->{name} . "' "
133 . "during composition. This is fatal error and cannot be disambiguated.")
136 $seen{$attr->{name}} = $attr->{attr};
139 foreach my $attr (@all_attributes) {
140 $c->add_attribute($attr->{name}, $attr->{attr});
147 my @all_methods = map {
149 my $aliases = $self->get_method_aliases_for_role($role);
150 my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) };
153 exists $excludes{$_} ? () :
157 method => $role->get_method($_),
159 } $role->get_method_list),
163 name => $aliases->{$_},
164 method => $role->get_method($_),
170 my (%seen, %method_map);
171 foreach my $method (@all_methods) {
172 if (exists $seen{$method->{name}}) {
173 if ($seen{$method->{name}}->body != $method->{method}->body) {
174 $c->add_required_methods($method->{name});
175 delete $method_map{$method->{name}};
180 $seen{$method->{name}} = $method->{method};
181 $method_map{$method->{name}} = $method->{method};
184 $c->add_method($_ => $method_map{$_}) for keys %method_map;
187 sub apply_override_method_modifiers {
190 my @all_overrides = map {
195 method => $role->get_override_method_modifier($_),
197 } $role->get_method_modifier_list('override');
201 foreach my $override (@all_overrides) {
202 if ( $c->has_method($override->{name}) ){
204 Moose->throw_error( "Role '" . $c->name . "' has encountered an 'override' method conflict " .
205 "during composition (A local method of the same name as been found). This " .
208 if (exists $seen{$override->{name}}) {
209 if ( $seen{$override->{name}} != $override->{method} ) {
211 Moose->throw_error( "We have encountered an 'override' method conflict during " .
212 "composition (Two 'override' methods of the same name encountered). " .
213 "This is fatal error.")
216 $seen{$override->{name}} = $override->{method};
219 $c->add_override_method_modifier(
220 $_->{name}, $_->{method}
221 ) for @all_overrides;
225 sub apply_method_modifiers {
226 my ($self, $modifier_type, $c) = @_;
227 my $add = "add_${modifier_type}_method_modifier";
228 my $get = "get_${modifier_type}_method_modifiers";
229 foreach my $role (@{$c->get_roles}) {
230 foreach my $method_name ($role->get_method_modifier_list($modifier_type)) {
234 ) foreach $role->$get($method_name);
247 Moose::Meta::Role::Application::RoleSummation - Combine two or more roles
251 Summation composes two traits, forming the union of non-conflicting
252 bindings and 'disabling' the conflicting bindings
264 =item B<get_exclusions_for_role>
266 =item B<get_method_aliases_for_role>
268 =item B<is_aliased_method>
270 =item B<is_method_aliased>
272 =item B<is_method_excluded>
276 =item B<check_role_exclusions>
278 =item B<check_required_methods>
280 =item B<check_required_attributes>
282 =item B<apply_attributes>
284 =item B<apply_methods>
286 =item B<apply_method_modifiers>
288 =item B<apply_override_method_modifiers>
294 All complex software has bugs lurking in it, and this module is no
295 exception. If you find a bug please either email me, or add the bug
300 Stevan Little E<lt>stevan@iinteractive.comE<gt>
302 =head1 COPYRIGHT AND LICENSE
304 Copyright 2006-2009 by Infinity Interactive, Inc.
306 L<http://www.iinteractive.com>
308 This library is free software; you can redistribute it and/or modify
309 it under the same terms as Perl itself.