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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 | |
3ee7b5ad |
11 | our $VERSION = '0.80'; |
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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 | } |
d03bd989 |
40 | return {}; |
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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, $method_name) = @_; |
d03bd989 |
58 | my %aliased_names = reverse %{$self->get_method_aliases_for_role($role->name)}; |
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59 | exists $aliased_names{$method_name} ? 1 : 0; |
60 | } |
61 | |
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62 | sub check_role_exclusions { |
63 | my ($self, $c) = @_; |
64 | |
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65 | my %excluded_roles; |
66 | for my $role (@{ $c->get_roles }) { |
67 | my $name = $role->name; |
68 | |
69 | for my $excluded ($role->get_excluded_roles_list) { |
70 | push @{ $excluded_roles{$excluded} }, $name; |
71 | } |
72 | } |
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73 | |
74 | foreach my $role (@{$c->get_roles}) { |
88cfb4cb |
75 | foreach my $excluded (keys %excluded_roles) { |
76 | next unless $role->does_role($excluded); |
77 | |
78 | my @excluding = @{ $excluded_roles{$excluded} }; |
70ea9161 |
79 | |
80 | require Moose; |
5b5b7c12 |
81 | 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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82 | } |
83 | } |
84 | |
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85 | $c->add_excluded_roles(keys %excluded_roles); |
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86 | } |
87 | |
88 | sub check_required_methods { |
89 | my ($self, $c) = @_; |
90 | |
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91 | my %all_required_methods = |
7e79d987 |
92 | map { $_->name => $_ } |
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93 | map { $_->get_required_method_list } |
94 | @{$c->get_roles}; |
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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 | |
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105 | $c->add_required_methods(values %all_required_methods); |
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106 | } |
107 | |
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108 | sub check_required_attributes { |
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109 | |
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110 | } |
111 | |
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112 | sub apply_attributes { |
113 | my ($self, $c) = @_; |
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114 | |
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115 | my @all_attributes = map { |
116 | my $role = $_; |
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117 | map { |
118 | +{ |
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119 | name => $_, |
120 | attr => $role->get_attribute($_), |
121 | } |
122 | } $role->get_attribute_list |
123 | } @{$c->get_roles}; |
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124 | |
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125 | my %seen; |
126 | foreach my $attr (@all_attributes) { |
127 | if (exists $seen{$attr->{name}}) { |
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128 | if ( $seen{$attr->{name}} != $attr->{attr} ) { |
129 | require Moose; |
d03bd989 |
130 | Moose->throw_error("We have encountered an attribute conflict with '" . $attr->{name} . "' " |
70ea9161 |
131 | . "during composition. This is fatal error and cannot be disambiguated.") |
132 | } |
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133 | } |
134 | $seen{$attr->{name}} = $attr->{attr}; |
135 | } |
136 | |
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137 | foreach my $attr (@all_attributes) { |
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138 | $c->add_attribute($attr->{name}, $attr->{attr}); |
139 | } |
140 | } |
141 | |
142 | sub apply_methods { |
143 | my ($self, $c) = @_; |
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144 | |
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145 | my @all_methods = map { |
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146 | my $role = $_; |
147 | my $aliases = $self->get_method_aliases_for_role($role); |
148 | my %excludes = map { $_ => undef } @{ $self->get_exclusions_for_role($role) }; |
149 | ( |
d03bd989 |
150 | (map { |
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151 | exists $excludes{$_} ? () : |
d03bd989 |
152 | +{ |
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153 | role => $role, |
154 | name => $_, |
155 | method => $role->get_method($_), |
156 | } |
157 | } $role->get_method_list), |
d03bd989 |
158 | (map { |
159 | +{ |
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160 | role => $role, |
161 | name => $aliases->{$_}, |
162 | method => $role->get_method($_), |
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163 | } |
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164 | } keys %$aliases) |
165 | ); |
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166 | } @{$c->get_roles}; |
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167 | |
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168 | my (%seen, %method_map); |
169 | foreach my $method (@all_methods) { |
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170 | my $seen = $seen{$method->{name}}; |
171 | |
172 | if ($seen) { |
173 | if ($seen->{method}->body != $method->{method}->body) { |
bb153262 |
174 | $c->add_conflicting_method( |
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175 | name => $method->{name}, |
78485053 |
176 | roles => [$method->{role}->name, $seen->{role}->name], |
49b8c93a |
177 | ); |
178 | |
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179 | delete $method_map{$method->{name}}; |
180 | next; |
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181 | } |
182 | } |
183 | |
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184 | $seen{$method->{name}} = $method; |
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185 | $method_map{$method->{name}} = $method->{method}; |
186 | } |
187 | |
87e63626 |
188 | $c->add_method($_ => $method_map{$_}) for keys %method_map; |
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189 | } |
190 | |
191 | sub apply_override_method_modifiers { |
192 | my ($self, $c) = @_; |
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193 | |
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194 | my @all_overrides = map { |
195 | my $role = $_; |
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196 | map { |
197 | +{ |
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198 | name => $_, |
199 | method => $role->get_override_method_modifier($_), |
200 | } |
201 | } $role->get_method_modifier_list('override'); |
202 | } @{$c->get_roles}; |
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203 | |
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204 | my %seen; |
205 | foreach my $override (@all_overrides) { |
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206 | if ( $c->has_method($override->{name}) ){ |
207 | require Moose; |
208 | Moose->throw_error( "Role '" . $c->name . "' has encountered an 'override' method conflict " . |
209 | "during composition (A local method of the same name as been found). This " . |
210 | "is fatal error." ) |
211 | } |
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212 | if (exists $seen{$override->{name}}) { |
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213 | if ( $seen{$override->{name}} != $override->{method} ) { |
214 | require Moose; |
215 | Moose->throw_error( "We have encountered an 'override' method conflict during " . |
216 | "composition (Two 'override' methods of the same name encountered). " . |
217 | "This is fatal error.") |
218 | } |
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219 | } |
220 | $seen{$override->{name}} = $override->{method}; |
221 | } |
d03bd989 |
222 | |
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223 | $c->add_override_method_modifier( |
224 | $_->{name}, $_->{method} |
225 | ) for @all_overrides; |
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226 | |
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227 | } |
228 | |
229 | sub apply_method_modifiers { |
230 | my ($self, $modifier_type, $c) = @_; |
231 | my $add = "add_${modifier_type}_method_modifier"; |
232 | my $get = "get_${modifier_type}_method_modifiers"; |
233 | foreach my $role (@{$c->get_roles}) { |
234 | foreach my $method_name ($role->get_method_modifier_list($modifier_type)) { |
235 | $c->$add( |
236 | $method_name, |
237 | $_ |
238 | ) foreach $role->$get($method_name); |
239 | } |
240 | } |
241 | } |
242 | |
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243 | 1; |
244 | |
245 | __END__ |
246 | |
247 | =pod |
248 | |
249 | =head1 NAME |
250 | |
ab76842e |
251 | Moose::Meta::Role::Application::RoleSummation - Combine two or more roles |
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252 | |
253 | =head1 DESCRIPTION |
254 | |
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255 | Summation composes two traits, forming the union of non-conflicting |
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256 | bindings and 'disabling' the conflicting bindings |
257 | |
258 | =head2 METHODS |
259 | |
260 | =over 4 |
261 | |
262 | =item B<new> |
263 | |
264 | =item B<meta> |
265 | |
28412c0b |
266 | =item B<role_params> |
267 | |
268 | =item B<get_exclusions_for_role> |
269 | |
270 | =item B<get_method_aliases_for_role> |
271 | |
272 | =item B<is_aliased_method> |
273 | |
274 | =item B<is_method_aliased> |
275 | |
276 | =item B<is_method_excluded> |
277 | |
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278 | =item B<apply> |
279 | |
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280 | =item B<check_role_exclusions> |
281 | |
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282 | =item B<check_required_methods> |
283 | |
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284 | =item B<check_required_attributes> |
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285 | |
286 | =item B<apply_attributes> |
287 | |
288 | =item B<apply_methods> |
289 | |
290 | =item B<apply_method_modifiers> |
291 | |
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292 | =item B<apply_override_method_modifiers> |
293 | |
294 | =back |
295 | |
296 | =head1 BUGS |
297 | |
298 | All complex software has bugs lurking in it, and this module is no |
299 | exception. If you find a bug please either email me, or add the bug |
300 | to cpan-RT. |
301 | |
302 | =head1 AUTHOR |
303 | |
304 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
305 | |
306 | =head1 COPYRIGHT AND LICENSE |
307 | |
2840a3b2 |
308 | Copyright 2006-2009 by Infinity Interactive, Inc. |
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309 | |
310 | L<http://www.iinteractive.com> |
311 | |
312 | This library is free software; you can redistribute it and/or modify |
313 | it under the same terms as Perl itself. |
314 | |
315 | =cut |
316 | |