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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 | |
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12 | our $VERSION = '0.55_01'; |
13 | $VERSION = eval $VERSION; |
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14 | our $AUTHORITY = 'cpan:STEVAN'; |
15 | |
16 | use base 'Moose::Meta::Role::Application'; |
17 | |
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18 | sub apply { |
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19 | my ($self, $role1, $role2) = @_; |
20 | $self->SUPER::apply($role1, $role2); |
21 | $role2->add_role($role1); |
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22 | } |
23 | |
24 | sub check_role_exclusions { |
25 | my ($self, $role1, $role2) = @_; |
26 | confess "Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'" |
27 | if $role2->excludes_role($role1->name); |
28 | foreach my $excluded_role_name ($role1->get_excluded_roles_list) { |
29 | confess "The class " . $role2->name . " does the excluded role '$excluded_role_name'" |
30 | if $role2->does_role($excluded_role_name); |
31 | $role2->add_excluded_roles($excluded_role_name); |
32 | } |
33 | } |
34 | |
35 | sub check_required_methods { |
36 | my ($self, $role1, $role2) = @_; |
37 | foreach my $required_method_name ($role1->get_required_method_list) { |
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38 | |
39 | next if $self->is_aliased_method($required_method_name); |
40 | |
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41 | $role2->add_required_methods($required_method_name) |
42 | unless $role2->find_method_by_name($required_method_name); |
43 | } |
44 | } |
45 | |
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46 | sub check_required_attributes { |
47 | |
48 | } |
49 | |
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50 | sub apply_attributes { |
51 | my ($self, $role1, $role2) = @_; |
52 | foreach my $attribute_name ($role1->get_attribute_list) { |
53 | # it if it has one already |
54 | if ($role2->has_attribute($attribute_name) && |
55 | # make sure we haven't seen this one already too |
56 | $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) { |
57 | confess "Role '" . $role1->name . "' has encountered an attribute conflict " . |
58 | "during composition. This is fatal error and cannot be disambiguated."; |
59 | } |
60 | else { |
61 | $role2->add_attribute( |
62 | $attribute_name, |
63 | $role1->get_attribute($attribute_name) |
64 | ); |
65 | } |
66 | } |
67 | } |
68 | |
69 | sub apply_methods { |
70 | my ($self, $role1, $role2) = @_; |
71 | foreach my $method_name ($role1->get_method_list) { |
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72 | |
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73 | next if $self->is_method_excluded($method_name); |
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74 | |
75 | if ($self->is_method_aliased($method_name)) { |
76 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
77 | # it if it has one already |
78 | if ($role2->has_method($aliased_method_name) && |
79 | # and if they are not the same thing ... |
80 | $role2->get_method($aliased_method_name)->body != $role1->get_method($method_name)->body) { |
81 | confess "Cannot create a method alias if a local method of the same name exists"; |
82 | } |
83 | |
84 | $role2->alias_method( |
85 | $aliased_method_name, |
86 | $role1->get_method($method_name) |
87 | ); |
88 | |
89 | if (!$role2->has_method($method_name)) { |
90 | $role2->add_required_methods($method_name); |
91 | } |
92 | |
93 | next; |
94 | } |
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95 | |
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96 | # it if it has one already |
97 | if ($role2->has_method($method_name) && |
98 | # and if they are not the same thing ... |
99 | $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) { |
100 | # method conflicts between roles result |
101 | # in the method becoming a requirement |
102 | $role2->add_required_methods($method_name); |
103 | } |
104 | else { |
105 | # add it, although it could be overriden |
106 | $role2->alias_method( |
107 | $method_name, |
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108 | $role1->get_method($method_name) |
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109 | ); |
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110 | |
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111 | } |
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112 | |
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113 | } |
114 | } |
115 | |
116 | sub apply_override_method_modifiers { |
117 | my ($self, $role1, $role2) = @_; |
118 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
119 | # it if it has one already then ... |
120 | if ($role2->has_method($method_name)) { |
121 | # if it is being composed into another role |
122 | # we have a conflict here, because you cannot |
123 | # combine an overriden method with a locally |
124 | # defined one |
125 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
126 | "during composition (A local method of the same name as been found). This " . |
127 | "is fatal error."; |
128 | } |
129 | else { |
130 | # if we are a role, we need to make sure |
131 | # we dont have a conflict with the role |
132 | # we are composing into |
133 | if ($role2->has_override_method_modifier($method_name) && |
134 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
135 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
136 | "during composition (Two 'override' methods of the same name encountered). " . |
137 | "This is fatal error."; |
138 | } |
139 | else { |
140 | # if there is no conflict, |
141 | # just add it to the role |
142 | $role2->add_override_method_modifier( |
143 | $method_name, |
144 | $role1->get_override_method_modifier($method_name) |
145 | ); |
146 | } |
147 | } |
148 | } |
149 | } |
150 | |
151 | sub apply_method_modifiers { |
152 | my ($self, $modifier_type, $role1, $role2) = @_; |
153 | my $add = "add_${modifier_type}_method_modifier"; |
154 | my $get = "get_${modifier_type}_method_modifiers"; |
155 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
156 | $role2->$add( |
157 | $method_name, |
158 | $_ |
159 | ) foreach $role1->$get($method_name); |
160 | } |
161 | } |
162 | |
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163 | |
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164 | 1; |
165 | |
166 | __END__ |
167 | |
168 | =pod |
169 | |
170 | =head1 NAME |
171 | |
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172 | Moose::Meta::Role::Application::ToRole - Compose a role into another role |
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173 | |
174 | =head1 DESCRIPTION |
175 | |
176 | =head2 METHODS |
177 | |
178 | =over 4 |
179 | |
180 | =item B<new> |
181 | |
182 | =item B<meta> |
183 | |
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184 | =item B<apply> |
185 | |
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186 | =item B<check_role_exclusions> |
187 | |
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188 | =item B<check_required_methods> |
189 | |
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190 | =item B<check_required_attributes> |
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191 | |
192 | =item B<apply_attributes> |
193 | |
194 | =item B<apply_methods> |
195 | |
196 | =item B<apply_method_modifiers> |
197 | |
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198 | =item B<apply_override_method_modifiers> |
199 | |
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200 | =back |
201 | |
202 | =head1 BUGS |
203 | |
204 | All complex software has bugs lurking in it, and this module is no |
205 | exception. If you find a bug please either email me, or add the bug |
206 | to cpan-RT. |
207 | |
208 | =head1 AUTHOR |
209 | |
210 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
211 | |
212 | =head1 COPYRIGHT AND LICENSE |
213 | |
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214 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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215 | |
216 | L<http://www.iinteractive.com> |
217 | |
218 | This library is free software; you can redistribute it and/or modify |
219 | it under the same terms as Perl itself. |
220 | |
221 | =cut |
222 | |