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1 | package Moose::Meta::Role::Application::RoleSummation; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed'; |
9 | use Data::Dumper; |
10 | |
11 | use Moose::Meta::Role::Composite; |
12 | |
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13 | our $VERSION = '0.55_02'; |
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14 | $VERSION = eval $VERSION; |
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15 | our $AUTHORITY = 'cpan:STEVAN'; |
16 | |
17 | use base 'Moose::Meta::Role::Application'; |
18 | |
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19 | __PACKAGE__->meta->add_attribute('role_params' => ( |
20 | reader => 'role_params', |
21 | default => sub { {} } |
22 | )); |
23 | |
24 | sub get_exclusions_for_role { |
25 | my ($self, $role) = @_; |
26 | $role = $role->name if blessed $role; |
27 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{excludes}) { |
28 | if (ref $self->role_params->{$role}->{excludes} eq 'ARRAY') { |
29 | return $self->role_params->{$role}->{excludes}; |
30 | } |
31 | return [ $self->role_params->{$role}->{excludes} ]; |
32 | } |
33 | return []; |
34 | } |
35 | |
36 | sub get_method_aliases_for_role { |
37 | my ($self, $role) = @_; |
38 | $role = $role->name if blessed $role; |
39 | if ($self->role_params->{$role} && defined $self->role_params->{$role}->{alias}) { |
40 | return $self->role_params->{$role}->{alias}; |
41 | } |
42 | return {}; |
43 | } |
44 | |
45 | sub is_method_excluded { |
46 | my ($self, $role, $method_name) = @_; |
47 | foreach ($self->get_exclusions_for_role($role->name)) { |
48 | return 1 if $_ eq $method_name; |
49 | } |
50 | return 0; |
51 | } |
52 | |
53 | sub is_method_aliased { |
54 | my ($self, $role, $method_name) = @_; |
55 | exists $self->get_method_aliases_for_role($role->name)->{$method_name} ? 1 : 0 |
56 | } |
57 | |
58 | sub is_aliased_method { |
59 | my ($self, $role, $method_name) = @_; |
60 | my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)}; |
61 | exists $aliased_names{$method_name} ? 1 : 0; |
62 | } |
63 | |
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64 | # stolen from List::MoreUtils ... |
65 | my $uniq = sub { my %h; map { $h{$_}++ == 0 ? $_ : () } @_ }; |
66 | |
67 | sub check_role_exclusions { |
68 | my ($self, $c) = @_; |
69 | |
70 | my @all_excluded_roles = $uniq->(map { |
71 | $_->get_excluded_roles_list |
72 | } @{$c->get_roles}); |
73 | |
74 | foreach my $role (@{$c->get_roles}) { |
75 | foreach my $excluded (@all_excluded_roles) { |
76 | confess "Conflict detected: " . $role->name . " excludes role '" . $excluded . "'" |
77 | if $role->does_role($excluded); |
78 | } |
79 | } |
80 | |
81 | $c->add_excluded_roles(@all_excluded_roles); |
82 | } |
83 | |
84 | sub check_required_methods { |
85 | my ($self, $c) = @_; |
86 | |
87 | my %all_required_methods = map { $_ => undef } $uniq->(map { |
88 | $_->get_required_method_list |
89 | } @{$c->get_roles}); |
90 | |
91 | foreach my $role (@{$c->get_roles}) { |
92 | foreach my $required (keys %all_required_methods) { |
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93 | |
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94 | delete $all_required_methods{$required} |
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95 | if $role->has_method($required) |
96 | || $self->is_aliased_method($role, $required); |
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97 | } |
98 | } |
99 | |
100 | $c->add_required_methods(keys %all_required_methods); |
101 | } |
102 | |
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103 | sub check_required_attributes { |
104 | |
105 | } |
106 | |
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107 | sub apply_attributes { |
108 | my ($self, $c) = @_; |
109 | |
110 | my @all_attributes = map { |
111 | my $role = $_; |
112 | map { |
113 | +{ |
114 | name => $_, |
115 | attr => $role->get_attribute($_), |
116 | } |
117 | } $role->get_attribute_list |
118 | } @{$c->get_roles}; |
119 | |
120 | my %seen; |
121 | foreach my $attr (@all_attributes) { |
122 | if (exists $seen{$attr->{name}}) { |
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123 | confess "We have encountered an attribute conflict with '" . $attr->{name} . "' " |
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124 | . "during composition. This is fatal error and cannot be disambiguated." |
125 | if $seen{$attr->{name}} != $attr->{attr}; |
126 | } |
127 | $seen{$attr->{name}} = $attr->{attr}; |
128 | } |
129 | |
130 | foreach my $attr (@all_attributes) { |
131 | $c->add_attribute($attr->{name}, $attr->{attr}); |
132 | } |
133 | } |
134 | |
135 | sub apply_methods { |
136 | my ($self, $c) = @_; |
137 | |
138 | my @all_methods = map { |
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139 | my $role = $_; |
140 | my $aliases = $self->get_method_aliases_for_role($role); |
141 | my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) }; |
142 | ( |
143 | (map { |
144 | exists $excludes{$_} ? () : |
145 | +{ |
146 | role => $role, |
147 | name => $_, |
148 | method => $role->get_method($_), |
149 | } |
150 | } $role->get_method_list), |
151 | (map { |
152 | +{ |
153 | role => $role, |
154 | name => $aliases->{$_}, |
155 | method => $role->get_method($_), |
156 | } |
157 | } keys %$aliases) |
158 | ); |
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159 | } @{$c->get_roles}; |
160 | |
161 | my (%seen, %method_map); |
162 | foreach my $method (@all_methods) { |
163 | if (exists $seen{$method->{name}}) { |
164 | if ($seen{$method->{name}}->body != $method->{method}->body) { |
165 | $c->add_required_methods($method->{name}); |
166 | delete $method_map{$method->{name}}; |
167 | next; |
168 | } |
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169 | } |
170 | |
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171 | $seen{$method->{name}} = $method->{method}; |
172 | $method_map{$method->{name}} = $method->{method}; |
173 | } |
174 | |
175 | $c->alias_method($_ => $method_map{$_}) for keys %method_map; |
176 | } |
177 | |
178 | sub apply_override_method_modifiers { |
179 | my ($self, $c) = @_; |
180 | |
181 | my @all_overrides = map { |
182 | my $role = $_; |
183 | map { |
184 | +{ |
185 | name => $_, |
186 | method => $role->get_override_method_modifier($_), |
187 | } |
188 | } $role->get_method_modifier_list('override'); |
189 | } @{$c->get_roles}; |
190 | |
191 | my %seen; |
192 | foreach my $override (@all_overrides) { |
193 | confess "Role '" . $c->name . "' has encountered an 'override' method conflict " . |
194 | "during composition (A local method of the same name as been found). This " . |
195 | "is fatal error." |
196 | if $c->has_method($override->{name}); |
197 | if (exists $seen{$override->{name}}) { |
198 | confess "We have encountered an 'override' method conflict during " . |
199 | "composition (Two 'override' methods of the same name encountered). " . |
200 | "This is fatal error." |
201 | if $seen{$override->{name}} != $override->{method}; |
202 | } |
203 | $seen{$override->{name}} = $override->{method}; |
204 | } |
205 | |
206 | $c->add_override_method_modifier( |
207 | $_->{name}, $_->{method} |
208 | ) for @all_overrides; |
209 | |
210 | } |
211 | |
212 | sub apply_method_modifiers { |
213 | my ($self, $modifier_type, $c) = @_; |
214 | my $add = "add_${modifier_type}_method_modifier"; |
215 | my $get = "get_${modifier_type}_method_modifiers"; |
216 | foreach my $role (@{$c->get_roles}) { |
217 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
218 | $c->$add( |
219 | $method_name, |
220 | $_ |
221 | ) foreach $role->$get($method_name); |
222 | } |
223 | } |
224 | } |
225 | |
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226 | 1; |
227 | |
228 | __END__ |
229 | |
230 | =pod |
231 | |
232 | =head1 NAME |
233 | |
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234 | Moose::Meta::Role::Application::RoleSummation - Combine two or more roles |
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235 | |
236 | =head1 DESCRIPTION |
237 | |
238 | Summation composes two traits, forming the union of non-conflicting |
239 | bindings and 'disabling' the conflicting bindings |
240 | |
241 | =head2 METHODS |
242 | |
243 | =over 4 |
244 | |
245 | =item B<new> |
246 | |
247 | =item B<meta> |
248 | |
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249 | =item B<role_params> |
250 | |
251 | =item B<get_exclusions_for_role> |
252 | |
253 | =item B<get_method_aliases_for_role> |
254 | |
255 | =item B<is_aliased_method> |
256 | |
257 | =item B<is_method_aliased> |
258 | |
259 | =item B<is_method_excluded> |
260 | |
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261 | =item B<apply> |
262 | |
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263 | =item B<check_role_exclusions> |
264 | |
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265 | =item B<check_required_methods> |
266 | |
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267 | =item B<check_required_attributes> |
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268 | |
269 | =item B<apply_attributes> |
270 | |
271 | =item B<apply_methods> |
272 | |
273 | =item B<apply_method_modifiers> |
274 | |
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275 | =item B<apply_override_method_modifiers> |
276 | |
277 | =back |
278 | |
279 | =head1 BUGS |
280 | |
281 | All complex software has bugs lurking in it, and this module is no |
282 | exception. If you find a bug please either email me, or add the bug |
283 | to cpan-RT. |
284 | |
285 | =head1 AUTHOR |
286 | |
287 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
288 | |
289 | =head1 COPYRIGHT AND LICENSE |
290 | |
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291 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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292 | |
293 | L<http://www.iinteractive.com> |
294 | |
295 | This library is free software; you can redistribute it and/or modify |
296 | it under the same terms as Perl itself. |
297 | |
298 | =cut |
299 | |