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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 = '0.52'; |
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13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
15 | use base 'Moose::Meta::Role::Application'; |
16 | |
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17 | sub apply { |
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18 | my ($self, $role1, $role2) = @_; |
19 | $self->SUPER::apply($role1, $role2); |
20 | $role2->add_role($role1); |
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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) { |
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37 | |
38 | next if $self->is_aliased_method($required_method_name); |
39 | |
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40 | $role2->add_required_methods($required_method_name) |
41 | unless $role2->find_method_by_name($required_method_name); |
42 | } |
43 | } |
44 | |
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45 | sub check_required_attributes { |
46 | |
47 | } |
48 | |
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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) { |
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71 | |
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72 | next if $self->is_method_excluded($method_name); |
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73 | |
74 | if ($self->is_method_aliased($method_name)) { |
75 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
76 | # it if it has one already |
77 | if ($role2->has_method($aliased_method_name) && |
78 | # and if they are not the same thing ... |
79 | $role2->get_method($aliased_method_name)->body != $role1->get_method($method_name)->body) { |
80 | confess "Cannot create a method alias if a local method of the same name exists"; |
81 | } |
82 | |
83 | $role2->alias_method( |
84 | $aliased_method_name, |
85 | $role1->get_method($method_name) |
86 | ); |
87 | |
88 | if (!$role2->has_method($method_name)) { |
89 | $role2->add_required_methods($method_name); |
90 | } |
91 | |
92 | next; |
93 | } |
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94 | |
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95 | # it if it has one already |
96 | if ($role2->has_method($method_name) && |
97 | # and if they are not the same thing ... |
98 | $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) { |
99 | # method conflicts between roles result |
100 | # in the method becoming a requirement |
101 | $role2->add_required_methods($method_name); |
102 | } |
103 | else { |
104 | # add it, although it could be overriden |
105 | $role2->alias_method( |
106 | $method_name, |
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107 | $role1->get_method($method_name) |
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108 | ); |
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109 | |
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110 | } |
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111 | |
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112 | } |
113 | } |
114 | |
115 | sub apply_override_method_modifiers { |
116 | my ($self, $role1, $role2) = @_; |
117 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
118 | # it if it has one already then ... |
119 | if ($role2->has_method($method_name)) { |
120 | # if it is being composed into another role |
121 | # we have a conflict here, because you cannot |
122 | # combine an overriden method with a locally |
123 | # defined one |
124 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
125 | "during composition (A local method of the same name as been found). This " . |
126 | "is fatal error."; |
127 | } |
128 | else { |
129 | # if we are a role, we need to make sure |
130 | # we dont have a conflict with the role |
131 | # we are composing into |
132 | if ($role2->has_override_method_modifier($method_name) && |
133 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
134 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
135 | "during composition (Two 'override' methods of the same name encountered). " . |
136 | "This is fatal error."; |
137 | } |
138 | else { |
139 | # if there is no conflict, |
140 | # just add it to the role |
141 | $role2->add_override_method_modifier( |
142 | $method_name, |
143 | $role1->get_override_method_modifier($method_name) |
144 | ); |
145 | } |
146 | } |
147 | } |
148 | } |
149 | |
150 | sub apply_method_modifiers { |
151 | my ($self, $modifier_type, $role1, $role2) = @_; |
152 | my $add = "add_${modifier_type}_method_modifier"; |
153 | my $get = "get_${modifier_type}_method_modifiers"; |
154 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
155 | $role2->$add( |
156 | $method_name, |
157 | $_ |
158 | ) foreach $role1->$get($method_name); |
159 | } |
160 | } |
161 | |
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162 | |
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163 | 1; |
164 | |
165 | __END__ |
166 | |
167 | =pod |
168 | |
169 | =head1 NAME |
170 | |
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171 | Moose::Meta::Role::Application::ToRole - Compose a role into another role |
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172 | |
173 | =head1 DESCRIPTION |
174 | |
175 | =head2 METHODS |
176 | |
177 | =over 4 |
178 | |
179 | =item B<new> |
180 | |
181 | =item B<meta> |
182 | |
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183 | =item B<apply> |
184 | |
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185 | =item B<check_role_exclusions> |
186 | |
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187 | =item B<check_required_methods> |
188 | |
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189 | =item B<check_required_attributes> |
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190 | |
191 | =item B<apply_attributes> |
192 | |
193 | =item B<apply_methods> |
194 | |
195 | =item B<apply_method_modifiers> |
196 | |
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197 | =item B<apply_override_method_modifiers> |
198 | |
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199 | =back |
200 | |
201 | =head1 BUGS |
202 | |
203 | All complex software has bugs lurking in it, and this module is no |
204 | exception. If you find a bug please either email me, or add the bug |
205 | to cpan-RT. |
206 | |
207 | =head1 AUTHOR |
208 | |
209 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
210 | |
211 | =head1 COPYRIGHT AND LICENSE |
212 | |
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213 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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214 | |
215 | L<http://www.iinteractive.com> |
216 | |
217 | This library is free software; you can redistribute it and/or modify |
218 | it under the same terms as Perl itself. |
219 | |
220 | =cut |
221 | |