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1 | package Moose::Meta::Role::Application::ToRole; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
7 | use Carp 'confess'; |
8 | use Scalar::Util 'blessed'; |
9 | |
10 | use Data::Dumper; |
11 | |
12 | our $VERSION = '0.01'; |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
14 | |
15 | use base 'Moose::Meta::Role::Application'; |
16 | |
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17 | sub apply { |
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18 | my ($self, $role1, $role2) = @_; |
19 | $self->SUPER::apply($role1, $role2); |
20 | $role2->add_role($role1); |
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21 | } |
22 | |
23 | sub check_role_exclusions { |
24 | my ($self, $role1, $role2) = @_; |
25 | confess "Conflict detected: " . $role2->name . " excludes role '" . $role1->name . "'" |
26 | if $role2->excludes_role($role1->name); |
27 | foreach my $excluded_role_name ($role1->get_excluded_roles_list) { |
28 | confess "The class " . $role2->name . " does the excluded role '$excluded_role_name'" |
29 | if $role2->does_role($excluded_role_name); |
30 | $role2->add_excluded_roles($excluded_role_name); |
31 | } |
32 | } |
33 | |
34 | sub check_required_methods { |
35 | my ($self, $role1, $role2) = @_; |
36 | foreach my $required_method_name ($role1->get_required_method_list) { |
37 | $role2->add_required_methods($required_method_name) |
38 | unless $role2->find_method_by_name($required_method_name); |
39 | } |
40 | } |
41 | |
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42 | sub check_required_attributes { |
43 | |
44 | } |
45 | |
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46 | sub apply_attributes { |
47 | my ($self, $role1, $role2) = @_; |
48 | foreach my $attribute_name ($role1->get_attribute_list) { |
49 | # it if it has one already |
50 | if ($role2->has_attribute($attribute_name) && |
51 | # make sure we haven't seen this one already too |
52 | $role2->get_attribute($attribute_name) != $role1->get_attribute($attribute_name)) { |
53 | confess "Role '" . $role1->name . "' has encountered an attribute conflict " . |
54 | "during composition. This is fatal error and cannot be disambiguated."; |
55 | } |
56 | else { |
57 | $role2->add_attribute( |
58 | $attribute_name, |
59 | $role1->get_attribute($attribute_name) |
60 | ); |
61 | } |
62 | } |
63 | } |
64 | |
65 | sub apply_methods { |
66 | my ($self, $role1, $role2) = @_; |
67 | foreach my $method_name ($role1->get_method_list) { |
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68 | |
69 | next if $self->is_method_excluded($method_name); |
70 | |
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71 | # it if it has one already |
72 | if ($role2->has_method($method_name) && |
73 | # and if they are not the same thing ... |
74 | $role2->get_method($method_name)->body != $role1->get_method($method_name)->body) { |
75 | # method conflicts between roles result |
76 | # in the method becoming a requirement |
77 | $role2->add_required_methods($method_name); |
78 | } |
79 | else { |
80 | # add it, although it could be overriden |
81 | $role2->alias_method( |
82 | $method_name, |
83 | $role1->get_method($method_name) |
84 | ); |
85 | } |
86 | } |
87 | } |
88 | |
89 | sub apply_override_method_modifiers { |
90 | my ($self, $role1, $role2) = @_; |
91 | foreach my $method_name ($role1->get_method_modifier_list('override')) { |
92 | # it if it has one already then ... |
93 | if ($role2->has_method($method_name)) { |
94 | # if it is being composed into another role |
95 | # we have a conflict here, because you cannot |
96 | # combine an overriden method with a locally |
97 | # defined one |
98 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
99 | "during composition (A local method of the same name as been found). This " . |
100 | "is fatal error."; |
101 | } |
102 | else { |
103 | # if we are a role, we need to make sure |
104 | # we dont have a conflict with the role |
105 | # we are composing into |
106 | if ($role2->has_override_method_modifier($method_name) && |
107 | $role2->get_override_method_modifier($method_name) != $role2->get_override_method_modifier($method_name)) { |
108 | confess "Role '" . $role1->name . "' has encountered an 'override' method conflict " . |
109 | "during composition (Two 'override' methods of the same name encountered). " . |
110 | "This is fatal error."; |
111 | } |
112 | else { |
113 | # if there is no conflict, |
114 | # just add it to the role |
115 | $role2->add_override_method_modifier( |
116 | $method_name, |
117 | $role1->get_override_method_modifier($method_name) |
118 | ); |
119 | } |
120 | } |
121 | } |
122 | } |
123 | |
124 | sub apply_method_modifiers { |
125 | my ($self, $modifier_type, $role1, $role2) = @_; |
126 | my $add = "add_${modifier_type}_method_modifier"; |
127 | my $get = "get_${modifier_type}_method_modifiers"; |
128 | foreach my $method_name ($role1->get_method_modifier_list($modifier_type)) { |
129 | $role2->$add( |
130 | $method_name, |
131 | $_ |
132 | ) foreach $role1->$get($method_name); |
133 | } |
134 | } |
135 | |
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136 | |
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137 | 1; |
138 | |
139 | __END__ |
140 | |
141 | =pod |
142 | |
143 | =head1 NAME |
144 | |
145 | Moose::Meta::Role::Application::ToRole |
146 | |
147 | =head1 DESCRIPTION |
148 | |
149 | =head2 METHODS |
150 | |
151 | =over 4 |
152 | |
153 | =item B<new> |
154 | |
155 | =item B<meta> |
156 | |
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157 | =item B<apply> |
158 | |
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159 | =item B<check_role_exclusions> |
160 | |
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161 | =item B<check_required_methods> |
162 | |
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163 | =item B<check_required_attributes> |
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164 | |
165 | =item B<apply_attributes> |
166 | |
167 | =item B<apply_methods> |
168 | |
169 | =item B<apply_method_modifiers> |
170 | |
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171 | =item B<apply_override_method_modifiers> |
172 | |
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173 | =back |
174 | |
175 | =head1 BUGS |
176 | |
177 | All complex software has bugs lurking in it, and this module is no |
178 | exception. If you find a bug please either email me, or add the bug |
179 | to cpan-RT. |
180 | |
181 | =head1 AUTHOR |
182 | |
183 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
184 | |
185 | =head1 COPYRIGHT AND LICENSE |
186 | |
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187 | Copyright 2006-2008 by Infinity Interactive, Inc. |
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188 | |
189 | L<http://www.iinteractive.com> |
190 | |
191 | This library is free software; you can redistribute it and/or modify |
192 | it under the same terms as Perl itself. |
193 | |
194 | =cut |
195 | |