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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 | |
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9 | use base 'Moose::Meta::Role::Application'; |
10 | |
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11 | sub apply { |
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12 | my ($self, $role1, $role2) = @_; |
13 | $self->SUPER::apply($role1, $role2); |
14 | $role2->add_role($role1); |
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15 | } |
16 | |
17 | sub check_role_exclusions { |
18 | my ($self, $role1, $role2) = @_; |
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19 | if ( $role2->excludes_role($role1->name) ) { |
20 | require Moose; |
21 | Moose->throw_error("Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'"); |
22 | } |
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23 | foreach my $excluded_role_name ($role1->get_excluded_roles_list) { |
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24 | if ( $role2->does_role($excluded_role_name) ) { |
25 | require Moose; |
0a58c428 |
26 | Moose->throw_error("The role " . $role2->name . " does the excluded role '$excluded_role_name'"); |
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27 | } |
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28 | $role2->add_excluded_roles($excluded_role_name); |
29 | } |
30 | } |
31 | |
32 | sub check_required_methods { |
33 | my ($self, $role1, $role2) = @_; |
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34 | foreach my $required_method ($role1->get_required_method_list) { |
35 | my $required_method_name = $required_method->name; |
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36 | |
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37 | next if $self->is_aliased_method($required_method_name); |
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38 | |
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39 | $role2->add_required_methods($required_method) |
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40 | unless $role2->find_method_by_name($required_method_name); |
41 | } |
42 | } |
43 | |
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44 | sub check_required_attributes { |
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45 | |
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46 | } |
47 | |
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48 | sub apply_attributes { |
49 | my ($self, $role1, $role2) = @_; |
50 | foreach my $attribute_name ($role1->get_attribute_list) { |
51 | # it if it has one already |
52 | if ($role2->has_attribute($attribute_name) && |
53 | # make sure we haven't seen this one already too |
54 | $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) { |
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55 | |
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56 | my $role2_name = $role2->name; |
57 | |
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58 | require Moose; |
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59 | Moose->throw_error( "Role '" |
60 | . $role1->name |
61 | . "' has encountered an attribute conflict" |
62 | . " while being composed into '$role2_name'." |
63 | . " This is a fatal error and cannot be disambiguated." |
64 | . " The conflicting attribute is named '$attribute_name'." ); |
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65 | } |
66 | else { |
67 | $role2->add_attribute( |
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68 | $role1->get_attribute($attribute_name)->clone |
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69 | ); |
70 | } |
71 | } |
72 | } |
73 | |
74 | sub apply_methods { |
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75 | my ( $self, $role1, $role2 ) = @_; |
76 | foreach my $method ( $role1->_get_local_methods ) { |
77 | |
78 | my $method_name = $method->name; |
79 | |
ba7d613d |
80 | next if $method->isa('Class::MOP::Method::Meta'); |
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81 | |
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82 | unless ( $self->is_method_excluded($method_name) ) { |
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83 | |
84 | my $role2_method = $role2->get_method($method_name); |
85 | if ( $role2_method |
86 | && $role2_method->body != $method->body ) { |
bd38046e |
87 | |
2afe5289 |
88 | # method conflicts between roles used to result in the method |
89 | # becoming a requirement but now are permitted just like |
90 | # for classes, hence no code in this branch anymore. |
bd38046e |
91 | } |
92 | else { |
93 | $role2->add_method( |
94 | $method_name, |
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95 | $method, |
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96 | ); |
97 | } |
98 | } |
99 | |
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100 | next unless $self->is_method_aliased($method_name); |
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101 | |
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102 | my $aliased_method_name = $self->get_method_aliases->{$method_name}; |
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103 | |
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104 | my $role2_method = $role2->get_method($aliased_method_name); |
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105 | |
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106 | if ( $role2_method |
107 | && $role2_method->body != $method->body ) { |
108 | |
109 | require Moose; |
110 | Moose->throw_error( |
111 | "Cannot create a method alias if a local method of the same name exists" |
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112 | ); |
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113 | } |
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114 | |
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115 | $role2->add_method( |
116 | $aliased_method_name, |
117 | $role1->get_method($method_name) |
118 | ); |
119 | |
120 | if ( !$role2->has_method($method_name) ) { |
121 | $role2->add_required_methods($method_name) |
122 | unless $self->is_method_excluded($method_name); |
1c9db35c |
123 | } |
124 | } |
125 | } |
126 | |
127 | sub apply_override_method_modifiers { |
128 | my ($self, $role1, $role2) = @_; |
129 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
130 | # it if it has one already then ... |
131 | if ($role2->has_method($method_name)) { |
132 | # if it is being composed into another role |
133 | # we have a conflict here, because you cannot |
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134 | # combine an overridden method with a locally |
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135 | # defined one |
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136 | require Moose; |
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137 | Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
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138 | "during composition (A local method of the same name as been found). This " . |
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139 | "is fatal error."); |
1c9db35c |
140 | } |
141 | else { |
142 | # if we are a role, we need to make sure |
143 | # we dont have a conflict with the role |
144 | # we are composing into |
145 | if ($role2->has_override_method_modifier($method_name) && |
146 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
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147 | |
148 | require Moose; |
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149 | Moose->throw_error("Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
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150 | "during composition (Two 'override' methods of the same name encountered). " . |
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151 | "This is fatal error."); |
1c9db35c |
152 | } |
153 | else { |
154 | # if there is no conflict, |
155 | # just add it to the role |
156 | $role2->add_override_method_modifier( |
157 | $method_name, |
158 | $role1->get_override_method_modifier($method_name) |
159 | ); |
160 | } |
161 | } |
162 | } |
163 | } |
164 | |
165 | sub apply_method_modifiers { |
166 | my ($self, $modifier_type, $role1, $role2) = @_; |
167 | my $add = "add_${modifier_type}_method_modifier"; |
168 | my $get = "get_${modifier_type}_method_modifiers"; |
169 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
170 | $role2->$add( |
171 | $method_name, |
172 | $_ |
173 | ) foreach $role1->$get($method_name); |
174 | } |
175 | } |
176 | |
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177 | |
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178 | 1; |
179 | |
ad46f524 |
180 | # ABSTRACT: Compose a role into another role |
181 | |
fb1e11d5 |
182 | __END__ |
183 | |
184 | =pod |
185 | |
fb1e11d5 |
186 | =head1 DESCRIPTION |
187 | |
188 | =head2 METHODS |
189 | |
190 | =over 4 |
191 | |
192 | =item B<new> |
193 | |
194 | =item B<meta> |
195 | |
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196 | =item B<apply> |
197 | |
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198 | =item B<check_role_exclusions> |
199 | |
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200 | =item B<check_required_methods> |
201 | |
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202 | =item B<check_required_attributes> |
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203 | |
204 | =item B<apply_attributes> |
205 | |
206 | =item B<apply_methods> |
207 | |
208 | =item B<apply_method_modifiers> |
209 | |
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210 | =item B<apply_override_method_modifiers> |
211 | |
fb1e11d5 |
212 | =back |
213 | |
214 | =head1 BUGS |
215 | |
d4048ef3 |
216 | See L<Moose/BUGS> for details on reporting bugs. |
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217 | |
fb1e11d5 |
218 | =cut |
219 | |