Commit | Line | Data |
c0e30cf5 |
1 | |
2 | package Moose::Meta::Class; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
648e79ae |
7 | use Class::MOP; |
8 | |
6ba6d68c |
9 | use Carp 'confess'; |
a7d0cd00 |
10 | use Scalar::Util 'weaken', 'blessed'; |
a15dff8d |
11 | |
78cd1d3b |
12 | our $VERSION = '0.04'; |
bc1e29b5 |
13 | |
c0e30cf5 |
14 | use base 'Class::MOP::Class'; |
15 | |
598340d5 |
16 | __PACKAGE__->meta->add_attribute('roles' => ( |
ef333f17 |
17 | reader => 'roles', |
18 | default => sub { [] } |
19 | )); |
20 | |
21 | sub add_role { |
22 | my ($self, $role) = @_; |
23 | (blessed($role) && $role->isa('Moose::Meta::Role')) |
24 | || confess "Roles must be instances of Moose::Meta::Role"; |
25 | push @{$self->roles} => $role; |
26 | } |
27 | |
28 | sub does_role { |
29 | my ($self, $role_name) = @_; |
30 | (defined $role_name) |
31 | || confess "You must supply a role name to look for"; |
32 | foreach my $role (@{$self->roles}) { |
bdabd620 |
33 | return 1 if $role->does_role($role_name); |
ef333f17 |
34 | } |
35 | return 0; |
36 | } |
37 | |
8c9d74e7 |
38 | sub new_object { |
39 | my ($class, %params) = @_; |
40 | my $self = $class->SUPER::new_object(%params); |
41 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
42 | next unless $params{$attr->name} && $attr->has_trigger; |
43 | $attr->trigger->($self, $params{$attr->name}); |
44 | } |
45 | return $self; |
46 | } |
47 | |
a15dff8d |
48 | sub construct_instance { |
49 | my ($class, %params) = @_; |
e522431d |
50 | my $instance = $params{'__INSTANCE__'} || {}; |
a15dff8d |
51 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
52 | my $init_arg = $attr->init_arg(); |
53 | # try to fetch the init arg from the %params ... |
54 | my $val; |
ca01a97b |
55 | if (exists $params{$init_arg}) { |
56 | $val = $params{$init_arg}; |
57 | } |
58 | else { |
59 | # skip it if it's lazy |
60 | next if $attr->is_lazy; |
61 | # and die if it is required |
62 | confess "Attribute (" . $attr->name . ") is required" |
63 | if $attr->is_required |
64 | } |
a15dff8d |
65 | # if nothing was in the %params, we can use the |
66 | # attribute's default value (if it has one) |
8339fae2 |
67 | if (!defined $val && $attr->has_default) { |
68 | $val = $attr->default($instance); |
69 | } |
00867c44 |
70 | if (defined $val) { |
00867c44 |
71 | if ($attr->has_type_constraint) { |
34a66aa3 |
72 | if ($attr->should_coerce && $attr->type_constraint->has_coercion) { |
a27aa600 |
73 | $val = $attr->type_constraint->coercion->coerce($val); |
7415b2cb |
74 | } |
a27aa600 |
75 | (defined($attr->type_constraint->check($val))) |
66811d63 |
76 | || confess "Attribute (" . $attr->name . ") does not pass the type contraint with '$val'"; |
00867c44 |
77 | } |
a15dff8d |
78 | } |
79 | $instance->{$attr->name} = $val; |
6ba6d68c |
80 | if (defined $val && $attr->is_weak_ref) { |
81 | weaken($instance->{$attr->name}); |
82 | } |
a15dff8d |
83 | } |
84 | return $instance; |
85 | } |
86 | |
a7d0cd00 |
87 | sub has_method { |
88 | my ($self, $method_name) = @_; |
89 | (defined $method_name && $method_name) |
90 | || confess "You must define a method name"; |
91 | |
92 | my $sub_name = ($self->name . '::' . $method_name); |
93 | |
94 | no strict 'refs'; |
95 | return 0 if !defined(&{$sub_name}); |
96 | my $method = \&{$sub_name}; |
97 | |
98 | return 1 if blessed($method) && $method->isa('Moose::Meta::Role::Method'); |
99 | return $self->SUPER::has_method($method_name); |
100 | } |
101 | |
102 | |
78cd1d3b |
103 | sub add_override_method_modifier { |
104 | my ($self, $name, $method, $_super_package) = @_; |
105 | # need this for roles ... |
106 | $_super_package ||= $self->name; |
107 | my $super = $self->find_next_method_by_name($name); |
108 | (defined $super) |
109 | || confess "You cannot override '$name' because it has no super method"; |
05d9eaf6 |
110 | $self->add_method($name => bless sub { |
78cd1d3b |
111 | my @args = @_; |
112 | no strict 'refs'; |
113 | no warnings 'redefine'; |
114 | local *{$_super_package . '::super'} = sub { $super->(@args) }; |
115 | return $method->(@args); |
05d9eaf6 |
116 | } => 'Moose::Meta::Method::Overriden'); |
78cd1d3b |
117 | } |
118 | |
119 | sub add_augment_method_modifier { |
05d9eaf6 |
120 | my ($self, $name, $method) = @_; |
78cd1d3b |
121 | my $super = $self->find_next_method_by_name($name); |
122 | (defined $super) |
05d9eaf6 |
123 | || confess "You cannot augment '$name' because it has no super method"; |
124 | my $_super_package = $super->package_name; |
125 | # BUT!,... if this is an overriden method .... |
126 | if ($super->isa('Moose::Meta::Method::Overriden')) { |
127 | # we need to be sure that we actually |
128 | # find the next method, which is not |
129 | # an 'override' method, the reason is |
130 | # that an 'override' method will not |
131 | # be the one calling inner() |
132 | my $real_super = $self->_find_next_method_by_name_which_is_not_overridden($name); |
133 | $_super_package = $real_super->package_name; |
134 | } |
78cd1d3b |
135 | $self->add_method($name => sub { |
136 | my @args = @_; |
137 | no strict 'refs'; |
138 | no warnings 'redefine'; |
05d9eaf6 |
139 | local *{$_super_package . '::inner'} = sub { $method->(@args) }; |
78cd1d3b |
140 | return $super->(@args); |
141 | }); |
142 | } |
143 | |
05d9eaf6 |
144 | sub _find_next_method_by_name_which_is_not_overridden { |
145 | my ($self, $name) = @_; |
146 | my @methods = $self->find_all_methods_by_name($name); |
147 | foreach my $method (@methods) { |
148 | return $method->{code} |
149 | if blessed($method->{code}) && !$method->{code}->isa('Moose::Meta::Method::Overriden'); |
150 | } |
151 | return undef; |
152 | } |
153 | |
154 | package Moose::Meta::Method::Overriden; |
155 | |
156 | use strict; |
157 | use warnings; |
158 | |
159 | our $VERSION = '0.01'; |
160 | |
161 | use base 'Class::MOP::Method'; |
162 | |
c0e30cf5 |
163 | 1; |
164 | |
165 | __END__ |
166 | |
167 | =pod |
168 | |
169 | =head1 NAME |
170 | |
e522431d |
171 | Moose::Meta::Class - The Moose metaclass |
c0e30cf5 |
172 | |
c0e30cf5 |
173 | =head1 DESCRIPTION |
174 | |
e522431d |
175 | This is a subclass of L<Class::MOP::Class> with Moose specific |
176 | extensions. |
177 | |
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178 | For the most part, the only time you will ever encounter an |
179 | instance of this class is if you are doing some serious deep |
180 | introspection. To really understand this class, you need to refer |
181 | to the L<Class::MOP::Class> documentation. |
182 | |
c0e30cf5 |
183 | =head1 METHODS |
184 | |
185 | =over 4 |
186 | |
8c9d74e7 |
187 | =item B<new_object> |
188 | |
a15dff8d |
189 | =item B<construct_instance> |
190 | |
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191 | This provides some Moose specific extensions to this method, you |
192 | almost never call this method directly unless you really know what |
193 | you are doing. |
194 | |
195 | This method makes sure to handle the moose weak-ref, type-constraint |
196 | and type coercion features. |
ef1d5f4b |
197 | |
e9ec68d6 |
198 | =item B<has_method ($name)> |
199 | |
200 | This accomidates Moose::Meta::Role::Method instances, which are |
201 | aliased, instead of added, but still need to be counted as valid |
202 | methods. |
203 | |
78cd1d3b |
204 | =item B<add_override_method_modifier ($name, $method)> |
205 | |
206 | =item B<add_augment_method_modifier ($name, $method)> |
207 | |
ef333f17 |
208 | =item B<roles> |
209 | |
210 | =item B<add_role ($role)> |
211 | |
212 | =item B<does_role ($role_name)> |
213 | |
c0e30cf5 |
214 | =back |
215 | |
216 | =head1 BUGS |
217 | |
218 | All complex software has bugs lurking in it, and this module is no |
219 | exception. If you find a bug please either email me, or add the bug |
220 | to cpan-RT. |
221 | |
c0e30cf5 |
222 | =head1 AUTHOR |
223 | |
224 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
225 | |
226 | =head1 COPYRIGHT AND LICENSE |
227 | |
228 | Copyright 2006 by Infinity Interactive, Inc. |
229 | |
230 | L<http://www.iinteractive.com> |
231 | |
232 | This library is free software; you can redistribute it and/or modify |
233 | it under the same terms as Perl itself. |
234 | |
235 | =cut |