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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 | |
6e56c6e0 |
11 | our $VERSION = '0.89_02'; |
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 | } |
c8b8d92f |
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}->{$alias_key}; |
28412c0b |
43 | } |
d03bd989 |
44 | return {}; |
28412c0b |
45 | } |
46 | |
47 | sub is_method_excluded { |
48 | my ($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 | |
88cfb4cb |
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} }; |
70ea9161 |
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 | |
88cfb4cb |
89 | $c->add_excluded_roles(keys %excluded_roles); |
fb1e11d5 |
90 | } |
91 | |
92 | sub check_required_methods { |
93 | my ($self, $c) = @_; |
94 | |
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95 | my %all_required_methods = |
7e79d987 |
96 | map { $_->name => $_ } |
d2682e6e |
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) { |
d03bd989 |
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 | $c->add_required_methods(values %all_required_methods); |
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110 | } |
111 | |
709c321c |
112 | sub check_required_attributes { |
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113 | |
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114 | } |
115 | |
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116 | sub apply_attributes { |
117 | my ($self, $c) = @_; |
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118 | |
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119 | my @all_attributes = map { |
120 | my $role = $_; |
d03bd989 |
121 | map { |
122 | +{ |
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123 | name => $_, |
124 | attr => $role->get_attribute($_), |
125 | } |
126 | } $role->get_attribute_list |
127 | } @{$c->get_roles}; |
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128 | |
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129 | my %seen; |
130 | foreach my $attr (@all_attributes) { |
131 | if (exists $seen{$attr->{name}}) { |
70ea9161 |
132 | if ( $seen{$attr->{name}} != $attr->{attr} ) { |
133 | require Moose; |
d03bd989 |
134 | Moose->throw_error("We have encountered an attribute conflict with '" . $attr->{name} . "' " |
70ea9161 |
135 | . "during composition. This is fatal error and cannot be disambiguated.") |
136 | } |
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137 | } |
138 | $seen{$attr->{name}} = $attr->{attr}; |
139 | } |
140 | |
d03bd989 |
141 | foreach my $attr (@all_attributes) { |
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142 | $c->add_attribute($attr->{name}, $attr->{attr}); |
143 | } |
144 | } |
145 | |
146 | sub apply_methods { |
147 | my ($self, $c) = @_; |
d03bd989 |
148 | |
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149 | my @all_methods = map { |
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150 | my $role = $_; |
151 | my $aliases = $self->get_method_aliases_for_role($role); |
152 | my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) }; |
a8547bc0 |
153 | $excludes{meta} = undef; |
28412c0b |
154 | ( |
d03bd989 |
155 | (map { |
28412c0b |
156 | exists $excludes{$_} ? () : |
d03bd989 |
157 | +{ |
28412c0b |
158 | role => $role, |
159 | name => $_, |
160 | method => $role->get_method($_), |
161 | } |
162 | } $role->get_method_list), |
d03bd989 |
163 | (map { |
164 | +{ |
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165 | role => $role, |
166 | name => $aliases->{$_}, |
167 | method => $role->get_method($_), |
d03bd989 |
168 | } |
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169 | } keys %$aliases) |
170 | ); |
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171 | } @{$c->get_roles}; |
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172 | |
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173 | my (%seen, %method_map); |
174 | foreach my $method (@all_methods) { |
49b8c93a |
175 | my $seen = $seen{$method->{name}}; |
176 | |
177 | if ($seen) { |
178 | if ($seen->{method}->body != $method->{method}->body) { |
bb153262 |
179 | $c->add_conflicting_method( |
49b8c93a |
180 | name => $method->{name}, |
78485053 |
181 | roles => [$method->{role}->name, $seen->{role}->name], |
49b8c93a |
182 | ); |
183 | |
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184 | delete $method_map{$method->{name}}; |
185 | next; |
d03bd989 |
186 | } |
187 | } |
188 | |
49b8c93a |
189 | $seen{$method->{name}} = $method; |
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190 | $method_map{$method->{name}} = $method->{method}; |
191 | } |
192 | |
87e63626 |
193 | $c->add_method($_ => $method_map{$_}) for keys %method_map; |
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194 | } |
195 | |
196 | sub apply_override_method_modifiers { |
197 | my ($self, $c) = @_; |
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198 | |
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199 | my @all_overrides = map { |
200 | my $role = $_; |
d03bd989 |
201 | map { |
202 | +{ |
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203 | name => $_, |
204 | method => $role->get_override_method_modifier($_), |
205 | } |
206 | } $role->get_method_modifier_list('override'); |
207 | } @{$c->get_roles}; |
d03bd989 |
208 | |
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209 | my %seen; |
210 | foreach my $override (@all_overrides) { |
70ea9161 |
211 | if ( $c->has_method($override->{name}) ){ |
212 | require Moose; |
213 | Moose->throw_error( "Role '" . $c->name . "' has encountered an 'override' method conflict " . |
214 | "during composition (A local method of the same name as been found). This " . |
215 | "is fatal error." ) |
216 | } |
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217 | if (exists $seen{$override->{name}}) { |
70ea9161 |
218 | if ( $seen{$override->{name}} != $override->{method} ) { |
219 | require Moose; |
220 | Moose->throw_error( "We have encountered an 'override' method conflict during " . |
221 | "composition (Two 'override' methods of the same name encountered). " . |
222 | "This is fatal error.") |
223 | } |
fb1e11d5 |
224 | } |
225 | $seen{$override->{name}} = $override->{method}; |
226 | } |
d03bd989 |
227 | |
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228 | $c->add_override_method_modifier( |
229 | $_->{name}, $_->{method} |
230 | ) for @all_overrides; |
d03bd989 |
231 | |
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232 | } |
233 | |
234 | sub apply_method_modifiers { |
235 | my ($self, $modifier_type, $c) = @_; |
236 | my $add = "add_${modifier_type}_method_modifier"; |
237 | my $get = "get_${modifier_type}_method_modifiers"; |
238 | foreach my $role (@{$c->get_roles}) { |
239 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
240 | $c->$add( |
241 | $method_name, |
242 | $_ |
243 | ) foreach $role->$get($method_name); |
244 | } |
245 | } |
246 | } |
247 | |
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248 | 1; |
249 | |
250 | __END__ |
251 | |
252 | =pod |
253 | |
254 | =head1 NAME |
255 | |
ab76842e |
256 | Moose::Meta::Role::Application::RoleSummation - Combine two or more roles |
fb1e11d5 |
257 | |
258 | =head1 DESCRIPTION |
259 | |
d03bd989 |
260 | Summation composes two traits, forming the union of non-conflicting |
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261 | bindings and 'disabling' the conflicting bindings |
262 | |
263 | =head2 METHODS |
264 | |
265 | =over 4 |
266 | |
267 | =item B<new> |
268 | |
269 | =item B<meta> |
270 | |
28412c0b |
271 | =item B<role_params> |
272 | |
273 | =item B<get_exclusions_for_role> |
274 | |
275 | =item B<get_method_aliases_for_role> |
276 | |
277 | =item B<is_aliased_method> |
278 | |
279 | =item B<is_method_aliased> |
280 | |
281 | =item B<is_method_excluded> |
282 | |
fb1e11d5 |
283 | =item B<apply> |
284 | |
709c321c |
285 | =item B<check_role_exclusions> |
286 | |
fb1e11d5 |
287 | =item B<check_required_methods> |
288 | |
709c321c |
289 | =item B<check_required_attributes> |
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290 | |
291 | =item B<apply_attributes> |
292 | |
293 | =item B<apply_methods> |
294 | |
295 | =item B<apply_method_modifiers> |
296 | |
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297 | =item B<apply_override_method_modifiers> |
298 | |
299 | =back |
300 | |
301 | =head1 BUGS |
302 | |
303 | All complex software has bugs lurking in it, and this module is no |
304 | exception. If you find a bug please either email me, or add the bug |
305 | to cpan-RT. |
306 | |
307 | =head1 AUTHOR |
308 | |
309 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
310 | |
311 | =head1 COPYRIGHT AND LICENSE |
312 | |
2840a3b2 |
313 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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314 | |
315 | L<http://www.iinteractive.com> |
316 | |
317 | This library is free software; you can redistribute it and/or modify |
318 | it under the same terms as Perl itself. |
319 | |
320 | =cut |
321 | |