1 package Moose::Meta::Role::Application::ToClass;
7 use Moose::Util 'english_list';
8 use Scalar::Util 'blessed';
10 our $VERSION = '0.75';
11 $VERSION = eval $VERSION;
12 our $AUTHORITY = 'cpan:STEVAN';
14 use base 'Moose::Meta::Role::Application';
17 my ($self, $role, $class) = @_;
18 $self->SUPER::apply($role, $class);
19 $class->add_role($role);
22 sub check_role_exclusions {
23 my ($self, $role, $class) = @_;
24 if ($class->excludes_role($role->name)) {
25 $class->throw_error("Conflict detected: " . $class->name . " excludes role '" . $role->name . "'");
27 foreach my $excluded_role_name ($role->get_excluded_roles_list) {
28 if ($class->does_role($excluded_role_name)) {
29 $class->throw_error("The class " . $class->name . " does the excluded role '$excluded_role_name'");
34 sub check_required_methods {
35 my ($self, $role, $class) = @_;
41 # we might need to move this down below the
42 # the attributes so that we can require any
43 # attribute accessors. However I am thinking
44 # that maybe those are somehow exempt from
45 # the require methods stuff.
46 foreach my $required_method_name ($role->get_required_method_list) {
48 if (!$class->find_method_by_name($required_method_name)) {
50 next if $self->is_aliased_method($required_method_name);
52 push @missing, $required_method_name;
56 return unless @missing;
61 my $noun = @missing == 1 ? 'method' : 'methods';
64 = Moose::Util::english_list( map { q{'} . $_ . q{'} } @missing );
69 . "' requires the $noun $list "
70 . "to be implemented by '"
71 . $class->name . q{'};
74 $class->throw_error($error);
77 sub check_required_attributes {
81 sub apply_attributes {
82 my ($self, $role, $class) = @_;
83 foreach my $attribute_name ($role->get_attribute_list) {
84 # it if it has one already
85 if ($class->has_attribute($attribute_name) &&
86 # make sure we haven't seen this one already too
87 $class->get_attribute($attribute_name) != $role->get_attribute($attribute_name)) {
91 $class->add_attribute(
93 $role->get_attribute($attribute_name)
100 my ($self, $role, $class) = @_;
101 my @implicitly_overridden;
103 foreach my $method_name ($role->get_method_list) {
104 unless ($self->is_method_excluded($method_name)) {
105 # it if it has one already
106 if ($class->has_method($method_name) &&
107 # and if they are not the same thing ...
108 $class->get_method($method_name)->body != $role->get_method($method_name)->body) {
109 push @implicitly_overridden, $method_name;
113 # add it, although it could be overridden
116 $role->get_method($method_name)
121 if ($self->is_method_aliased($method_name)) {
122 my $aliased_method_name = $self->get_method_aliases->{$method_name};
123 # it if it has one already
124 if ($class->has_method($aliased_method_name) &&
125 # and if they are not the same thing ...
126 $class->get_method($aliased_method_name)->body != $role->get_method($method_name)->body) {
127 $class->throw_error("Cannot create a method alias if a local method of the same name exists");
130 $aliased_method_name,
131 $role->get_method($method_name)
136 if (@implicitly_overridden) {
137 my $plural = @implicitly_overridden > 1 ? "s" : "";
138 # we use \n because we have no hope of guessing the right stack frame,
139 # it's almost certainly never going to be the one above us
140 warn "The " . $class->name . " class has implicitly overridden the method$plural (" . join(', ', @implicitly_overridden) . ") from role " . $role->name . ". If this is intentional, please exclude the method$plural from composition to silence this warning (see Moose::Cookbook::Roles::Recipe2)\n";
143 # we must reset the cache here since
144 # we are just aliasing methods, otherwise
145 # the modifiers go wonky.
146 $class->reset_package_cache_flag;
149 sub apply_override_method_modifiers {
150 my ($self, $role, $class) = @_;
151 foreach my $method_name ($role->get_method_modifier_list('override')) {
152 # it if it has one already then ...
153 if ($class->has_method($method_name)) {
157 # if this is not a role, then we need to
158 # find the original package of the method
159 # so that we can tell the class were to
160 # find the right super() method
161 my $method = $role->get_override_method_modifier($method_name);
162 my ($package) = Class::MOP::get_code_info($method);
163 # if it is a class, we just add it
164 $class->add_override_method_modifier($method_name, $method, $package);
169 sub apply_method_modifiers {
170 my ($self, $modifier_type, $role, $class) = @_;
171 my $add = "add_${modifier_type}_method_modifier";
172 my $get = "get_${modifier_type}_method_modifiers";
173 foreach my $method_name ($role->get_method_modifier_list($modifier_type)) {
177 ) foreach $role->$get($method_name);
189 Moose::Meta::Role::Application::ToClass - Compose a role into a class
203 =item B<check_role_exclusions>
205 =item B<check_required_methods>
207 =item B<check_required_attributes>
209 =item B<apply_attributes>
211 =item B<apply_methods>
213 =item B<apply_method_modifiers>
215 =item B<apply_override_method_modifiers>
221 All complex software has bugs lurking in it, and this module is no
222 exception. If you find a bug please either email me, or add the bug
227 Stevan Little E<lt>stevan@iinteractive.comE<gt>
229 =head1 COPYRIGHT AND LICENSE
231 Copyright 2006-2009 by Infinity Interactive, Inc.
233 L<http://www.iinteractive.com>
235 This library is free software; you can redistribute it and/or modify
236 it under the same terms as Perl itself.