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1 | package Moose::Meta::Role::Application::RoleSummation; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use Scalar::Util 'blessed'; |
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8 | |
9 | use Moose::Meta::Role::Composite; |
10 | |
d874ffad |
11 | our $VERSION = '1.20'; |
e606ae5f |
12 | $VERSION = eval $VERSION; |
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13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
15 | use base 'Moose::Meta::Role::Application'; |
16 | |
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17 | __PACKAGE__->meta->add_attribute('role_params' => ( |
18 | reader => 'role_params', |
19 | default => sub { {} } |
20 | )); |
21 | |
22 | sub get_exclusions_for_role { |
23 | my ($self, $role) = @_; |
24 | $role = $role->name if blessed $role; |
c8b8d92f |
25 | my $excludes_key = exists $self->role_params->{$role}->{'-excludes'} ? |
26 | '-excludes' : 'excludes'; |
27 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{$excludes_key}) { |
28 | if (ref $self->role_params->{$role}->{$excludes_key} eq 'ARRAY') { |
29 | return $self->role_params->{$role}->{$excludes_key}; |
28412c0b |
30 | } |
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31 | return [ $self->role_params->{$role}->{$excludes_key} ]; |
28412c0b |
32 | } |
33 | return []; |
34 | } |
35 | |
36 | sub get_method_aliases_for_role { |
37 | my ($self, $role) = @_; |
38 | $role = $role->name if blessed $role; |
c8b8d92f |
39 | my $alias_key = exists $self->role_params->{$role}->{'-alias'} ? |
40 | '-alias' : 'alias'; |
41 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{$alias_key}) { |
42 | return $self->role_params->{$role}->{$alias_key}; |
28412c0b |
43 | } |
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44 | return {}; |
28412c0b |
45 | } |
46 | |
47 | sub is_method_excluded { |
48 | my ($self, $role, $method_name) = @_; |
49 | foreach ($self->get_exclusions_for_role($role->name)) { |
50 | return 1 if $_ eq $method_name; |
51 | } |
52 | return 0; |
53 | } |
54 | |
55 | sub is_method_aliased { |
56 | my ($self, $role, $method_name) = @_; |
57 | exists $self->get_method_aliases_for_role($role->name)->{$method_name} ? 1 : 0 |
58 | } |
59 | |
60 | sub is_aliased_method { |
61 | my ($self, $role, $method_name) = @_; |
d03bd989 |
62 | my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)}; |
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63 | exists $aliased_names{$method_name} ? 1 : 0; |
64 | } |
65 | |
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66 | sub check_role_exclusions { |
67 | my ($self, $c) = @_; |
68 | |
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69 | my %excluded_roles; |
70 | for my $role (@{ $c->get_roles }) { |
71 | my $name = $role->name; |
72 | |
73 | for my $excluded ($role->get_excluded_roles_list) { |
74 | push @{ $excluded_roles{$excluded} }, $name; |
75 | } |
76 | } |
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77 | |
78 | foreach my $role (@{$c->get_roles}) { |
88cfb4cb |
79 | foreach my $excluded (keys %excluded_roles) { |
80 | next unless $role->does_role($excluded); |
81 | |
82 | my @excluding = @{ $excluded_roles{$excluded} }; |
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83 | |
84 | require Moose; |
5b5b7c12 |
85 | Moose->throw_error(sprintf "Conflict detected: Role%s %s exclude%s role '%s'", (@excluding == 1 ? '' : 's'), join(', ', @excluding), (@excluding == 1 ? 's' : ''), $excluded); |
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86 | } |
87 | } |
88 | |
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89 | $c->add_excluded_roles(keys %excluded_roles); |
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90 | } |
91 | |
92 | sub check_required_methods { |
93 | my ($self, $c) = @_; |
94 | |
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95 | my %all_required_methods = |
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96 | map { $_->name => $_ } |
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97 | map { $_->get_required_method_list } |
98 | @{$c->get_roles}; |
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99 | |
100 | foreach my $role (@{$c->get_roles}) { |
101 | foreach my $required (keys %all_required_methods) { |
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102 | |
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103 | delete $all_required_methods{$required} |
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104 | if $role->has_method($required) |
105 | || $self->is_aliased_method($role, $required); |
fb1e11d5 |
106 | } |
107 | } |
108 | |
7e79d987 |
109 | $c->add_required_methods(values %all_required_methods); |
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110 | } |
111 | |
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112 | sub check_required_attributes { |
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113 | |
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114 | } |
115 | |
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116 | sub apply_attributes { |
117 | my ($self, $c) = @_; |
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118 | |
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119 | my @all_attributes; |
120 | |
121 | for my $role ( @{ $c->get_roles } ) { |
122 | push @all_attributes, |
123 | map { $role->get_attribute($_) } $role->get_attribute_list; |
124 | } |
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125 | |
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126 | my %seen; |
127 | foreach my $attr (@all_attributes) { |
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128 | my $name = $attr->name; |
129 | |
130 | if ( exists $seen{$name} ) { |
131 | next if $seen{$name}->is_same_as($attr); |
132 | |
133 | my $role1 = $seen{$name}->associated_role->name; |
134 | my $role2 = $attr->associated_role->name; |
135 | |
136 | require Moose; |
137 | Moose->throw_error( |
138 | "We have encountered an attribute conflict with '$name' " |
139 | . "during role composition. " |
140 | . " This attribute is defined in both $role1 and $role2." |
141 | . " This is fatal error and cannot be disambiguated." ); |
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142 | } |
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143 | |
144 | $seen{$name} = $attr; |
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145 | } |
146 | |
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147 | foreach my $attr (@all_attributes) { |
f785aad8 |
148 | $c->add_attribute( $attr->clone ); |
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149 | } |
150 | } |
151 | |
152 | sub apply_methods { |
153 | my ($self, $c) = @_; |
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154 | |
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155 | my @all_methods = map { |
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156 | my $role = $_; |
157 | my $aliases = $self->get_method_aliases_for_role($role); |
158 | my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) }; |
159 | ( |
d03bd989 |
160 | (map { |
28412c0b |
161 | exists $excludes{$_} ? () : |
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162 | +{ |
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163 | role => $role, |
164 | name => $_, |
165 | method => $role->get_method($_), |
166 | } |
ba7d613d |
167 | } map { $_->name } |
168 | grep { !$_->isa('Class::MOP::Method::Meta') } |
169 | $role->_get_local_methods), |
d03bd989 |
170 | (map { |
171 | +{ |
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172 | role => $role, |
173 | name => $aliases->{$_}, |
174 | method => $role->get_method($_), |
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175 | } |
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176 | } keys %$aliases) |
177 | ); |
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178 | } @{$c->get_roles}; |
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179 | |
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180 | my (%seen, %method_map); |
181 | foreach my $method (@all_methods) { |
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182 | my $seen = $seen{$method->{name}}; |
183 | |
184 | if ($seen) { |
185 | if ($seen->{method}->body != $method->{method}->body) { |
bb153262 |
186 | $c->add_conflicting_method( |
49b8c93a |
187 | name => $method->{name}, |
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188 | roles => [$method->{role}->name, $seen->{role}->name], |
49b8c93a |
189 | ); |
190 | |
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191 | delete $method_map{$method->{name}}; |
192 | next; |
d03bd989 |
193 | } |
194 | } |
195 | |
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196 | $seen{$method->{name}} = $method; |
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197 | $method_map{$method->{name}} = $method->{method}; |
198 | } |
199 | |
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200 | $c->add_method($_ => $method_map{$_}) for keys %method_map; |
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201 | } |
202 | |
203 | sub apply_override_method_modifiers { |
204 | my ($self, $c) = @_; |
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205 | |
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206 | my @all_overrides = map { |
207 | my $role = $_; |
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208 | map { |
209 | +{ |
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210 | name => $_, |
211 | method => $role->get_override_method_modifier($_), |
212 | } |
213 | } $role->get_method_modifier_list('override'); |
214 | } @{$c->get_roles}; |
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215 | |
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216 | my %seen; |
217 | foreach my $override (@all_overrides) { |
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218 | if ( $c->has_method($override->{name}) ){ |
219 | require Moose; |
220 | Moose->throw_error( "Role '" . $c->name . "' has encountered an 'override' method conflict " . |
221 | "during composition (A local method of the same name as been found). This " . |
222 | "is fatal error." ) |
223 | } |
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224 | if (exists $seen{$override->{name}}) { |
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225 | if ( $seen{$override->{name}} != $override->{method} ) { |
226 | require Moose; |
227 | Moose->throw_error( "We have encountered an 'override' method conflict during " . |
228 | "composition (Two 'override' methods of the same name encountered). " . |
229 | "This is fatal error.") |
230 | } |
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231 | } |
232 | $seen{$override->{name}} = $override->{method}; |
233 | } |
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234 | |
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235 | $c->add_override_method_modifier( |
236 | $_->{name}, $_->{method} |
237 | ) for @all_overrides; |
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238 | |
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239 | } |
240 | |
241 | sub apply_method_modifiers { |
242 | my ($self, $modifier_type, $c) = @_; |
243 | my $add = "add_${modifier_type}_method_modifier"; |
244 | my $get = "get_${modifier_type}_method_modifiers"; |
245 | foreach my $role (@{$c->get_roles}) { |
246 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
247 | $c->$add( |
248 | $method_name, |
249 | $_ |
250 | ) foreach $role->$get($method_name); |
251 | } |
252 | } |
253 | } |
254 | |
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255 | 1; |
256 | |
257 | __END__ |
258 | |
259 | =pod |
260 | |
261 | =head1 NAME |
262 | |
ab76842e |
263 | Moose::Meta::Role::Application::RoleSummation - Combine two or more roles |
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264 | |
265 | =head1 DESCRIPTION |
266 | |
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267 | Summation composes two traits, forming the union of non-conflicting |
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268 | bindings and 'disabling' the conflicting bindings |
269 | |
270 | =head2 METHODS |
271 | |
272 | =over 4 |
273 | |
274 | =item B<new> |
275 | |
276 | =item B<meta> |
277 | |
28412c0b |
278 | =item B<role_params> |
279 | |
280 | =item B<get_exclusions_for_role> |
281 | |
282 | =item B<get_method_aliases_for_role> |
283 | |
284 | =item B<is_aliased_method> |
285 | |
286 | =item B<is_method_aliased> |
287 | |
288 | =item B<is_method_excluded> |
289 | |
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290 | =item B<apply> |
291 | |
709c321c |
292 | =item B<check_role_exclusions> |
293 | |
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294 | =item B<check_required_methods> |
295 | |
709c321c |
296 | =item B<check_required_attributes> |
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297 | |
298 | =item B<apply_attributes> |
299 | |
300 | =item B<apply_methods> |
301 | |
302 | =item B<apply_method_modifiers> |
303 | |
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304 | =item B<apply_override_method_modifiers> |
305 | |
306 | =back |
307 | |
308 | =head1 BUGS |
309 | |
d4048ef3 |
310 | See L<Moose/BUGS> for details on reporting bugs. |
fb1e11d5 |
311 | |
312 | =head1 AUTHOR |
313 | |
314 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
315 | |
316 | =head1 COPYRIGHT AND LICENSE |
317 | |
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318 | Copyright 2006-2010 by Infinity Interactive, Inc. |
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319 | |
320 | L<http://www.iinteractive.com> |
321 | |
322 | This library is free software; you can redistribute it and/or modify |
323 | it under the same terms as Perl itself. |
324 | |
325 | =cut |
326 | |