Commit | Line | Data |
fb1e11d5 |
1 | package Moose::Meta::Role::Application::ToRole; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed'; |
9 | |
10 | use Data::Dumper; |
11 | |
eaa35e6e |
12 | our $VERSION = '0.50'; |
fb1e11d5 |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
15 | use base 'Moose::Meta::Role::Application'; |
16 | |
1c9db35c |
17 | sub apply { |
c4538447 |
18 | my ($self, $role1, $role2) = @_; |
19 | $self->SUPER::apply($role1, $role2); |
20 | $role2->add_role($role1); |
1c9db35c |
21 | } |
22 | |
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); |
31 | } |
32 | } |
33 | |
34 | sub check_required_methods { |
35 | my ($self, $role1, $role2) = @_; |
36 | foreach my $required_method_name ($role1->get_required_method_list) { |
3e19778d |
37 | |
38 | next if $self->is_aliased_method($required_method_name); |
39 | |
1c9db35c |
40 | $role2->add_required_methods($required_method_name) |
41 | unless $role2->find_method_by_name($required_method_name); |
42 | } |
43 | } |
44 | |
709c321c |
45 | sub check_required_attributes { |
46 | |
47 | } |
48 | |
1c9db35c |
49 | sub apply_attributes { |
50 | my ($self, $role1, $role2) = @_; |
51 | foreach my $attribute_name ($role1->get_attribute_list) { |
52 | # it if it has one already |
53 | if ($role2->has_attribute($attribute_name) && |
54 | # make sure we haven't seen this one already too |
55 | $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) { |
56 | confess "Role '" . $role1->name . "' has encountered an attribute conflict " . |
57 | "during composition. This is fatal error and cannot be disambiguated."; |
58 | } |
59 | else { |
60 | $role2->add_attribute( |
61 | $attribute_name, |
62 | $role1->get_attribute($attribute_name) |
63 | ); |
64 | } |
65 | } |
66 | } |
67 | |
68 | sub apply_methods { |
69 | my ($self, $role1, $role2) = @_; |
70 | foreach my $method_name ($role1->get_method_list) { |
c4538447 |
71 | |
43a41ede |
72 | next if $self->is_method_excluded($method_name); |
3e19778d |
73 | |
1c9db35c |
74 | # it if it has one already |
75 | if ($role2->has_method($method_name) && |
76 | # and if they are not the same thing ... |
77 | $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) { |
78 | # method conflicts between roles result |
79 | # in the method becoming a requirement |
80 | $role2->add_required_methods($method_name); |
81 | } |
82 | else { |
83 | # add it, although it could be overriden |
84 | $role2->alias_method( |
85 | $method_name, |
43a41ede |
86 | $role1->get_method($method_name) |
1c9db35c |
87 | ); |
43a41ede |
88 | |
1c9db35c |
89 | } |
43a41ede |
90 | |
91 | if ($self->is_method_aliased($method_name)) { |
92 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
93 | # it if it has one already |
94 | if ($role2->has_method($aliased_method_name) && |
95 | # and if they are not the same thing ... |
96 | $role2->get_method($aliased_method_name)->body != $role1->get_method($method_name)->body) { |
97 | confess "Cannot create a method alias if a local method of the same name exists"; |
98 | } |
99 | $role2->alias_method( |
100 | $aliased_method_name, |
101 | $role1->get_method($method_name) |
102 | ); |
103 | } |
1c9db35c |
104 | } |
105 | } |
106 | |
107 | sub apply_override_method_modifiers { |
108 | my ($self, $role1, $role2) = @_; |
109 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
110 | # it if it has one already then ... |
111 | if ($role2->has_method($method_name)) { |
112 | # if it is being composed into another role |
113 | # we have a conflict here, because you cannot |
114 | # combine an overriden method with a locally |
115 | # defined one |
116 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
117 | "during composition (A local method of the same name as been found). This " . |
118 | "is fatal error."; |
119 | } |
120 | else { |
121 | # if we are a role, we need to make sure |
122 | # we dont have a conflict with the role |
123 | # we are composing into |
124 | if ($role2->has_override_method_modifier($method_name) && |
125 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
126 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
127 | "during composition (Two 'override' methods of the same name encountered). " . |
128 | "This is fatal error."; |
129 | } |
130 | else { |
131 | # if there is no conflict, |
132 | # just add it to the role |
133 | $role2->add_override_method_modifier( |
134 | $method_name, |
135 | $role1->get_override_method_modifier($method_name) |
136 | ); |
137 | } |
138 | } |
139 | } |
140 | } |
141 | |
142 | sub apply_method_modifiers { |
143 | my ($self, $modifier_type, $role1, $role2) = @_; |
144 | my $add = "add_${modifier_type}_method_modifier"; |
145 | my $get = "get_${modifier_type}_method_modifiers"; |
146 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
147 | $role2->$add( |
148 | $method_name, |
149 | $_ |
150 | ) foreach $role1->$get($method_name); |
151 | } |
152 | } |
153 | |
1c9db35c |
154 | |
fb1e11d5 |
155 | 1; |
156 | |
157 | __END__ |
158 | |
159 | =pod |
160 | |
161 | =head1 NAME |
162 | |
ab76842e |
163 | Moose::Meta::Role::Application::ToRole - Compose a role into another role |
fb1e11d5 |
164 | |
165 | =head1 DESCRIPTION |
166 | |
167 | =head2 METHODS |
168 | |
169 | =over 4 |
170 | |
171 | =item B<new> |
172 | |
173 | =item B<meta> |
174 | |
1c9db35c |
175 | =item B<apply> |
176 | |
709c321c |
177 | =item B<check_role_exclusions> |
178 | |
1c9db35c |
179 | =item B<check_required_methods> |
180 | |
709c321c |
181 | =item B<check_required_attributes> |
1c9db35c |
182 | |
183 | =item B<apply_attributes> |
184 | |
185 | =item B<apply_methods> |
186 | |
187 | =item B<apply_method_modifiers> |
188 | |
1c9db35c |
189 | =item B<apply_override_method_modifiers> |
190 | |
fb1e11d5 |
191 | =back |
192 | |
193 | =head1 BUGS |
194 | |
195 | All complex software has bugs lurking in it, and this module is no |
196 | exception. If you find a bug please either email me, or add the bug |
197 | to cpan-RT. |
198 | |
199 | =head1 AUTHOR |
200 | |
201 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
202 | |
203 | =head1 COPYRIGHT AND LICENSE |
204 | |
778db3ac |
205 | Copyright 2006-2008 by Infinity Interactive, Inc. |
fb1e11d5 |
206 | |
207 | L<http://www.iinteractive.com> |
208 | |
209 | This library is free software; you can redistribute it and/or modify |
210 | it under the same terms as Perl itself. |
211 | |
212 | =cut |
213 | |