Commit | Line | Data |
fb1e11d5 |
1 | package Moose::Meta::Role::Application::ToRole; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use Scalar::Util 'blessed'; |
8 | |
fb1e11d5 |
9 | use base 'Moose::Meta::Role::Application'; |
10 | |
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11 | sub apply { |
d03bd989 |
12 | my ($self, $role1, $role2) = @_; |
bf46ee52 |
13 | |
14 | # We're not checking for role names to support multiple instances of the |
15 | # same Parameterized role. |
16 | return if grep { $role1 == $_ } @{ $role2->get_roles() }; |
17 | |
d03bd989 |
18 | $self->SUPER::apply($role1, $role2); |
bf46ee52 |
19 | |
d03bd989 |
20 | $role2->add_role($role1); |
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21 | } |
22 | |
23 | sub check_role_exclusions { |
24 | my ($self, $role1, $role2) = @_; |
70ea9161 |
25 | if ( $role2->excludes_role($role1->name) ) { |
26 | require Moose; |
27 | Moose->throw_error("Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'"); |
28 | } |
1c9db35c |
29 | foreach my $excluded_role_name ($role1->get_excluded_roles_list) { |
70ea9161 |
30 | if ( $role2->does_role($excluded_role_name) ) { |
31 | require Moose; |
0a58c428 |
32 | Moose->throw_error("The role " . $role2->name . " does the excluded role '$excluded_role_name'"); |
70ea9161 |
33 | } |
1c9db35c |
34 | $role2->add_excluded_roles($excluded_role_name); |
35 | } |
36 | } |
37 | |
38 | sub check_required_methods { |
39 | my ($self, $role1, $role2) = @_; |
4c93bc92 |
40 | foreach my $required_method ($role1->get_required_method_list) { |
41 | my $required_method_name = $required_method->name; |
d03bd989 |
42 | |
3e19778d |
43 | next if $self->is_aliased_method($required_method_name); |
d03bd989 |
44 | |
4c93bc92 |
45 | $role2->add_required_methods($required_method) |
1c9db35c |
46 | unless $role2->find_method_by_name($required_method_name); |
47 | } |
48 | } |
49 | |
709c321c |
50 | sub check_required_attributes { |
d03bd989 |
51 | |
709c321c |
52 | } |
53 | |
1c9db35c |
54 | sub apply_attributes { |
55 | my ($self, $role1, $role2) = @_; |
56 | foreach my $attribute_name ($role1->get_attribute_list) { |
57 | # it if it has one already |
58 | if ($role2->has_attribute($attribute_name) && |
59 | # make sure we haven't seen this one already too |
60 | $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) { |
70ea9161 |
61 | |
51d4595e |
62 | my $role2_name = $role2->name; |
63 | |
70ea9161 |
64 | require Moose; |
51d4595e |
65 | Moose->throw_error( "Role '" |
66 | . $role1->name |
67 | . "' has encountered an attribute conflict" |
68 | . " while being composed into '$role2_name'." |
69 | . " This is a fatal error and cannot be disambiguated." |
70 | . " The conflicting attribute is named '$attribute_name'." ); |
1c9db35c |
71 | } |
72 | else { |
73 | $role2->add_attribute( |
f785aad8 |
74 | $role1->get_attribute($attribute_name)->clone |
1c9db35c |
75 | ); |
76 | } |
77 | } |
78 | } |
79 | |
80 | sub apply_methods { |
4a9e8ff6 |
81 | my ( $self, $role1, $role2 ) = @_; |
82 | foreach my $method ( $role1->_get_local_methods ) { |
83 | |
84 | my $method_name = $method->name; |
85 | |
ba7d613d |
86 | next if $method->isa('Class::MOP::Method::Meta'); |
db9476b1 |
87 | |
bd38046e |
88 | unless ( $self->is_method_excluded($method_name) ) { |
4a9e8ff6 |
89 | |
90 | my $role2_method = $role2->get_method($method_name); |
91 | if ( $role2_method |
92 | && $role2_method->body != $method->body ) { |
bd38046e |
93 | |
94 | # method conflicts between roles result in the method becoming |
95 | # a requirement |
96 | $role2->add_conflicting_method( |
97 | name => $method_name, |
98 | roles => [ $role1->name, $role2->name ], |
99 | ); |
100 | } |
101 | else { |
102 | $role2->add_method( |
103 | $method_name, |
4a9e8ff6 |
104 | $method, |
bd38046e |
105 | ); |
106 | } |
107 | } |
108 | |
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109 | next unless $self->is_method_aliased($method_name); |
094b50c0 |
110 | |
4a9e8ff6 |
111 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
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112 | |
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113 | my $role2_method = $role2->get_method($aliased_method_name); |
db9476b1 |
114 | |
4a9e8ff6 |
115 | if ( $role2_method |
116 | && $role2_method->body != $method->body ) { |
117 | |
118 | require Moose; |
119 | Moose->throw_error( |
120 | "Cannot create a method alias if a local method of the same name exists" |
db9476b1 |
121 | ); |
4a9e8ff6 |
122 | } |
db9476b1 |
123 | |
4a9e8ff6 |
124 | $role2->add_method( |
125 | $aliased_method_name, |
126 | $role1->get_method($method_name) |
127 | ); |
128 | |
129 | if ( !$role2->has_method($method_name) ) { |
130 | $role2->add_required_methods($method_name) |
131 | unless $self->is_method_excluded($method_name); |
1c9db35c |
132 | } |
133 | } |
134 | } |
135 | |
136 | sub apply_override_method_modifiers { |
137 | my ($self, $role1, $role2) = @_; |
138 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
139 | # it if it has one already then ... |
140 | if ($role2->has_method($method_name)) { |
141 | # if it is being composed into another role |
142 | # we have a conflict here, because you cannot |
6549b0d1 |
143 | # combine an overridden method with a locally |
1c9db35c |
144 | # defined one |
70ea9161 |
145 | require Moose; |
c245d69b |
146 | Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
1c9db35c |
147 | "during composition (A local method of the same name as been found). This " . |
4c0b3599 |
148 | "is fatal error."); |
1c9db35c |
149 | } |
150 | else { |
151 | # if we are a role, we need to make sure |
152 | # we dont have a conflict with the role |
153 | # we are composing into |
154 | if ($role2->has_override_method_modifier($method_name) && |
155 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
70ea9161 |
156 | |
157 | require Moose; |
c245d69b |
158 | Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
1c9db35c |
159 | "during composition (Two 'override' methods of the same name encountered). " . |
4c0b3599 |
160 | "This is fatal error."); |
1c9db35c |
161 | } |
162 | else { |
163 | # if there is no conflict, |
164 | # just add it to the role |
165 | $role2->add_override_method_modifier( |
166 | $method_name, |
167 | $role1->get_override_method_modifier($method_name) |
168 | ); |
169 | } |
170 | } |
171 | } |
172 | } |
173 | |
174 | sub apply_method_modifiers { |
175 | my ($self, $modifier_type, $role1, $role2) = @_; |
176 | my $add = "add_${modifier_type}_method_modifier"; |
177 | my $get = "get_${modifier_type}_method_modifiers"; |
178 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
179 | $role2->$add( |
180 | $method_name, |
181 | $_ |
182 | ) foreach $role1->$get($method_name); |
183 | } |
184 | } |
185 | |
1c9db35c |
186 | |
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187 | 1; |
188 | |
ad46f524 |
189 | # ABSTRACT: Compose a role into another role |
190 | |
fb1e11d5 |
191 | __END__ |
192 | |
193 | =pod |
194 | |
fb1e11d5 |
195 | =head1 DESCRIPTION |
196 | |
197 | =head2 METHODS |
198 | |
199 | =over 4 |
200 | |
201 | =item B<new> |
202 | |
203 | =item B<meta> |
204 | |
1c9db35c |
205 | =item B<apply> |
206 | |
709c321c |
207 | =item B<check_role_exclusions> |
208 | |
1c9db35c |
209 | =item B<check_required_methods> |
210 | |
709c321c |
211 | =item B<check_required_attributes> |
1c9db35c |
212 | |
213 | =item B<apply_attributes> |
214 | |
215 | =item B<apply_methods> |
216 | |
217 | =item B<apply_method_modifiers> |
218 | |
1c9db35c |
219 | =item B<apply_override_method_modifiers> |
220 | |
fb1e11d5 |
221 | =back |
222 | |
223 | =head1 BUGS |
224 | |
d4048ef3 |
225 | See L<Moose/BUGS> for details on reporting bugs. |
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226 | |
fb1e11d5 |
227 | =cut |
228 | |