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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 | |
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11 | our $VERSION = '0.61'; |
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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 $role; |
25 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{excludes}) { |
26 | if (ref $self->role_params->{$role}->{excludes} eq 'ARRAY') { |
27 | return $self->role_params->{$role}->{excludes}; |
28 | } |
29 | return [ $self->role_params->{$role}->{excludes} ]; |
30 | } |
31 | return []; |
32 | } |
33 | |
34 | sub get_method_aliases_for_role { |
35 | my ($self, $role) = @_; |
36 | $role = $role->name if blessed $role; |
37 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{alias}) { |
38 | return $self->role_params->{$role}->{alias}; |
39 | } |
40 | return {}; |
41 | } |
42 | |
43 | sub is_method_excluded { |
44 | my ($self, $role, $method_name) = @_; |
45 | foreach ($self->get_exclusions_for_role($role->name)) { |
46 | return 1 if $_ eq $method_name; |
47 | } |
48 | return 0; |
49 | } |
50 | |
51 | sub is_method_aliased { |
52 | my ($self, $role, $method_name) = @_; |
53 | exists $self->get_method_aliases_for_role($role->name)->{$method_name} ? 1 : 0 |
54 | } |
55 | |
56 | sub is_aliased_method { |
57 | my ($self, $role, $method_name) = @_; |
58 | my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)}; |
59 | exists $aliased_names{$method_name} ? 1 : 0; |
60 | } |
61 | |
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62 | # stolen from List::MoreUtils ... |
63 | my $uniq = sub { my %h; map { $h{$_}++ == 0 ? $_ : () } @_ }; |
64 | |
65 | sub check_role_exclusions { |
66 | my ($self, $c) = @_; |
67 | |
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68 | my %excluded_roles; |
69 | for my $role (@{ $c->get_roles }) { |
70 | my $name = $role->name; |
71 | |
72 | for my $excluded ($role->get_excluded_roles_list) { |
73 | push @{ $excluded_roles{$excluded} }, $name; |
74 | } |
75 | } |
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76 | |
77 | foreach my $role (@{$c->get_roles}) { |
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78 | foreach my $excluded (keys %excluded_roles) { |
79 | next unless $role->does_role($excluded); |
80 | |
81 | my @excluding = @{ $excluded_roles{$excluded} }; |
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82 | 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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83 | } |
84 | } |
85 | |
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86 | $c->add_excluded_roles(keys %excluded_roles); |
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87 | } |
88 | |
89 | sub check_required_methods { |
90 | my ($self, $c) = @_; |
91 | |
92 | my %all_required_methods = map { $_ => undef } $uniq->(map { |
93 | $_->get_required_method_list |
94 | } @{$c->get_roles}); |
95 | |
96 | foreach my $role (@{$c->get_roles}) { |
97 | foreach my $required (keys %all_required_methods) { |
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98 | |
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99 | delete $all_required_methods{$required} |
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100 | if $role->has_method($required) |
101 | || $self->is_aliased_method($role, $required); |
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102 | } |
103 | } |
104 | |
105 | $c->add_required_methods(keys %all_required_methods); |
106 | } |
107 | |
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108 | sub check_required_attributes { |
109 | |
110 | } |
111 | |
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112 | sub apply_attributes { |
113 | my ($self, $c) = @_; |
114 | |
115 | my @all_attributes = map { |
116 | my $role = $_; |
117 | map { |
118 | +{ |
119 | name => $_, |
120 | attr => $role->get_attribute($_), |
121 | } |
122 | } $role->get_attribute_list |
123 | } @{$c->get_roles}; |
124 | |
125 | my %seen; |
126 | foreach my $attr (@all_attributes) { |
127 | if (exists $seen{$attr->{name}}) { |
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128 | Moose->throw_error("We have encountered an attribute conflict with '" . $attr->{name} . "' " |
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129 | . "during composition. This is fatal error and cannot be disambiguated.") |
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130 | if $seen{$attr->{name}} != $attr->{attr}; |
131 | } |
132 | $seen{$attr->{name}} = $attr->{attr}; |
133 | } |
134 | |
135 | foreach my $attr (@all_attributes) { |
136 | $c->add_attribute($attr->{name}, $attr->{attr}); |
137 | } |
138 | } |
139 | |
140 | sub apply_methods { |
141 | my ($self, $c) = @_; |
142 | |
143 | my @all_methods = map { |
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144 | my $role = $_; |
145 | my $aliases = $self->get_method_aliases_for_role($role); |
146 | my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) }; |
147 | ( |
148 | (map { |
149 | exists $excludes{$_} ? () : |
150 | +{ |
151 | role => $role, |
152 | name => $_, |
153 | method => $role->get_method($_), |
154 | } |
155 | } $role->get_method_list), |
156 | (map { |
157 | +{ |
158 | role => $role, |
159 | name => $aliases->{$_}, |
160 | method => $role->get_method($_), |
161 | } |
162 | } keys %$aliases) |
163 | ); |
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164 | } @{$c->get_roles}; |
165 | |
166 | my (%seen, %method_map); |
167 | foreach my $method (@all_methods) { |
168 | if (exists $seen{$method->{name}}) { |
169 | if ($seen{$method->{name}}->body != $method->{method}->body) { |
170 | $c->add_required_methods($method->{name}); |
171 | delete $method_map{$method->{name}}; |
172 | next; |
173 | } |
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174 | } |
175 | |
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176 | $seen{$method->{name}} = $method->{method}; |
177 | $method_map{$method->{name}} = $method->{method}; |
178 | } |
179 | |
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180 | $c->add_method($_ => $method_map{$_}) for keys %method_map; |
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181 | } |
182 | |
183 | sub apply_override_method_modifiers { |
184 | my ($self, $c) = @_; |
185 | |
186 | my @all_overrides = map { |
187 | my $role = $_; |
188 | map { |
189 | +{ |
190 | name => $_, |
191 | method => $role->get_override_method_modifier($_), |
192 | } |
193 | } $role->get_method_modifier_list('override'); |
194 | } @{$c->get_roles}; |
195 | |
196 | my %seen; |
197 | foreach my $override (@all_overrides) { |
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198 | Moose->throw_error( "Role '" . $c->name . "' has encountered an 'override' method conflict " . |
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199 | "during composition (A local method of the same name as been found). This " . |
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200 | "is fatal error." ) |
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201 | if $c->has_method($override->{name}); |
202 | if (exists $seen{$override->{name}}) { |
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203 | Moose->throw_error( "We have encountered an 'override' method conflict during " . |
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204 | "composition (Two 'override' methods of the same name encountered). " . |
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205 | "This is fatal error.") |
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206 | if $seen{$override->{name}} != $override->{method}; |
207 | } |
208 | $seen{$override->{name}} = $override->{method}; |
209 | } |
210 | |
211 | $c->add_override_method_modifier( |
212 | $_->{name}, $_->{method} |
213 | ) for @all_overrides; |
214 | |
215 | } |
216 | |
217 | sub apply_method_modifiers { |
218 | my ($self, $modifier_type, $c) = @_; |
219 | my $add = "add_${modifier_type}_method_modifier"; |
220 | my $get = "get_${modifier_type}_method_modifiers"; |
221 | foreach my $role (@{$c->get_roles}) { |
222 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
223 | $c->$add( |
224 | $method_name, |
225 | $_ |
226 | ) foreach $role->$get($method_name); |
227 | } |
228 | } |
229 | } |
230 | |
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231 | 1; |
232 | |
233 | __END__ |
234 | |
235 | =pod |
236 | |
237 | =head1 NAME |
238 | |
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239 | Moose::Meta::Role::Application::RoleSummation - Combine two or more roles |
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240 | |
241 | =head1 DESCRIPTION |
242 | |
243 | Summation composes two traits, forming the union of non-conflicting |
244 | bindings and 'disabling' the conflicting bindings |
245 | |
246 | =head2 METHODS |
247 | |
248 | =over 4 |
249 | |
250 | =item B<new> |
251 | |
252 | =item B<meta> |
253 | |
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254 | =item B<role_params> |
255 | |
256 | =item B<get_exclusions_for_role> |
257 | |
258 | =item B<get_method_aliases_for_role> |
259 | |
260 | =item B<is_aliased_method> |
261 | |
262 | =item B<is_method_aliased> |
263 | |
264 | =item B<is_method_excluded> |
265 | |
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266 | =item B<apply> |
267 | |
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268 | =item B<check_role_exclusions> |
269 | |
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270 | =item B<check_required_methods> |
271 | |
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272 | =item B<check_required_attributes> |
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273 | |
274 | =item B<apply_attributes> |
275 | |
276 | =item B<apply_methods> |
277 | |
278 | =item B<apply_method_modifiers> |
279 | |
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280 | =item B<apply_override_method_modifiers> |
281 | |
282 | =back |
283 | |
284 | =head1 BUGS |
285 | |
286 | All complex software has bugs lurking in it, and this module is no |
287 | exception. If you find a bug please either email me, or add the bug |
288 | to cpan-RT. |
289 | |
290 | =head1 AUTHOR |
291 | |
292 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
293 | |
294 | =head1 COPYRIGHT AND LICENSE |
295 | |
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296 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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297 | |
298 | L<http://www.iinteractive.com> |
299 | |
300 | This library is free software; you can redistribute it and/or modify |
301 | it under the same terms as Perl itself. |
302 | |
303 | =cut |
304 | |