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1 | #!/usr/bin/env perl |
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2 | package Mouse::Meta::Class; |
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3 | use strict; |
4 | use warnings; |
5 | |
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6 | use Mouse::Meta::Method::Constructor; |
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7 | use Mouse::Meta::Method::Destructor; |
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8 | use Mouse::Util qw/get_linear_isa blessed/; |
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9 | use Carp 'confess'; |
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10 | |
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11 | do { |
12 | my %METACLASS_CACHE; |
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13 | |
14 | # because Mouse doesn't introspect existing classes, we're forced to |
15 | # only pay attention to other Mouse classes |
16 | sub _metaclass_cache { |
17 | my $class = shift; |
18 | my $name = shift; |
19 | return $METACLASS_CACHE{$name}; |
20 | } |
21 | |
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22 | sub initialize { |
23 | my $class = shift; |
24 | my $name = shift; |
25 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
26 | if !exists($METACLASS_CACHE{$name}); |
27 | return $METACLASS_CACHE{$name}; |
28 | } |
29 | }; |
30 | |
31 | sub new { |
32 | my $class = shift; |
6cbacbf6 |
33 | my %args = @_; |
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34 | |
35 | $args{attributes} = {}; |
36 | $args{superclasses} = do { |
37 | no strict 'refs'; |
38 | \@{ $args{name} . '::ISA' }; |
39 | }; |
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40 | $args{roles} ||= []; |
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41 | |
42 | bless \%args, $class; |
43 | } |
44 | |
45 | sub name { $_[0]->{name} } |
46 | |
47 | sub superclasses { |
48 | my $self = shift; |
49 | |
50 | if (@_) { |
51 | Mouse::load_class($_) for @_; |
52 | @{ $self->{superclasses} } = @_; |
53 | } |
54 | |
55 | @{ $self->{superclasses} }; |
56 | } |
57 | |
d16fe7d7 |
58 | sub add_method { |
59 | my $self = shift; |
60 | my $name = shift; |
61 | my $code = shift; |
62 | |
63 | my $pkg = $self->name; |
64 | |
65 | no strict 'refs'; |
66 | *{ $pkg . '::' . $name } = $code; |
67 | } |
68 | |
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69 | # copied from Class::Inspector |
70 | sub get_method_list { |
71 | my $self = shift; |
72 | my $name = $self->name; |
73 | |
74 | no strict 'refs'; |
75 | # Get all the CODE symbol table entries |
76 | my @functions = grep !/^meta$/, |
77 | grep { /\A[^\W\d]\w*\z/o } |
78 | grep { defined &{"${name}::$_"} } |
79 | keys %{"${name}::"}; |
80 | wantarray ? @functions : \@functions; |
81 | } |
82 | |
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83 | sub add_attribute { |
84 | my $self = shift; |
85 | my $attr = shift; |
86 | |
87 | $self->{'attributes'}{$attr->name} = $attr; |
88 | } |
89 | |
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90 | sub compute_all_applicable_attributes { |
91 | my $self = shift; |
92 | my (@attr, %seen); |
93 | |
94 | for my $class ($self->linearized_isa) { |
95 | my $meta = $self->_metaclass_cache($class) |
96 | or next; |
97 | |
98 | for my $name (keys %{ $meta->get_attribute_map }) { |
99 | next if $seen{$name}++; |
100 | push @attr, $meta->get_attribute($name); |
101 | } |
102 | } |
103 | |
104 | return @attr; |
105 | } |
106 | |
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107 | sub get_attribute_map { $_[0]->{attributes} } |
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108 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
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109 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
110 | |
00ca1c62 |
111 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
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112 | |
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113 | sub clone_object { |
114 | my $class = shift; |
115 | my $instance = shift; |
116 | |
117 | (blessed($instance) && $instance->isa($class->name)) |
1a0f0802 |
118 | || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; |
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119 | |
120 | $class->clone_instance($instance, @_); |
121 | } |
122 | |
123 | sub clone_instance { |
124 | my ($class, $instance, %params) = @_; |
125 | |
126 | (blessed($instance)) |
e42bee44 |
127 | || confess "You can only clone instances, ($instance) is not a blessed instance"; |
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128 | |
129 | my $clone = bless { %$instance }, ref $instance; |
130 | |
131 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
132 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
133 | if (exists $params{$init_arg}) { |
134 | $clone->{ $attr->name } = $params{$init_arg}; |
135 | } |
136 | } |
137 | } |
138 | |
139 | return $clone; |
140 | |
141 | } |
142 | |
fc1d8369 |
143 | sub make_immutable { |
144 | my $self = shift; |
145 | my $name = $self->name; |
146 | $self->{is_immutable}++; |
147 | no strict 'refs'; |
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148 | *{"$name\::new"} = Mouse::Meta::Method::Constructor->generate_constructor_method_inline( $self ); |
149 | *{"$name\::DESTROY"} = Mouse::Meta::Method::Destructor->generate_destructor_method_inline( $self ); |
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150 | } |
151 | sub make_mutable { |
152 | Carp::croak "Mouse::Meta::Class->make_mutable does not supported by Mouse"; |
153 | } |
154 | sub is_immutable { $_[0]->{is_immutable} } |
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155 | |
156 | sub attribute_metaclass { "Mouse::Meta::Class" } |
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157 | |
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158 | sub add_before_method_modifier { |
159 | my ($self, $name, $code) = @_; |
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160 | require Class::Method::Modifiers; |
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161 | Class::Method::Modifiers::_install_modifier( |
162 | $self->name, |
163 | 'before', |
164 | $name, |
165 | $code, |
166 | ); |
167 | } |
168 | |
169 | sub add_around_method_modifier { |
170 | my ($self, $name, $code) = @_; |
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171 | require Class::Method::Modifiers; |
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172 | Class::Method::Modifiers::_install_modifier( |
173 | $self->name, |
174 | 'around', |
175 | $name, |
176 | $code, |
177 | ); |
178 | } |
179 | |
180 | sub add_after_method_modifier { |
181 | my ($self, $name, $code) = @_; |
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182 | require Class::Method::Modifiers; |
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183 | Class::Method::Modifiers::_install_modifier( |
184 | $self->name, |
185 | 'after', |
186 | $name, |
187 | $code, |
188 | ); |
189 | } |
190 | |
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191 | sub roles { $_[0]->{roles} } |
192 | |
193 | sub does_role { |
194 | my ($self, $role_name) = @_; |
195 | (defined $role_name) |
196 | || confess "You must supply a role name to look for"; |
197 | for my $role (@{ $self->{roles} }) { |
198 | return 1 if $role->name eq $role_name; |
199 | } |
200 | return 0; |
201 | } |
202 | |
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203 | 1; |
204 | |
205 | __END__ |
206 | |
207 | =head1 NAME |
208 | |
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209 | Mouse::Meta::Class - hook into the Mouse MOP |
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210 | |
211 | =head1 METHODS |
212 | |
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213 | =head2 initialize ClassName -> Mouse::Meta::Class |
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214 | |
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215 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
216 | one instance should exist for a given class. |
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217 | |
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218 | =head2 new %args -> Mouse::Meta::Class |
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219 | |
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220 | Creates a new Mouse::Meta::Class. Don't call this directly. |
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221 | |
222 | =head2 name -> ClassName |
223 | |
224 | Returns the name of the owner class. |
225 | |
226 | =head2 superclasses -> [ClassName] |
227 | |
228 | Gets (or sets) the list of superclasses of the owner class. |
229 | |
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230 | =head2 add_attribute Mouse::Meta::Attribute |
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231 | |
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232 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
233 | class. |
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234 | |
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235 | =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) |
236 | |
237 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
238 | this class and its superclasses. |
239 | |
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240 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
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241 | |
242 | Returns a mapping of attribute names to their corresponding |
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243 | L<Mouse::Meta::Attribute> objects. |
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244 | |
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245 | =head2 has_attribute Name -> Boool |
246 | |
247 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
248 | |
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249 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
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250 | |
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251 | Returns the L<Mouse::Meta::Attribute> with the given name. |
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252 | |
253 | =head2 linearized_isa -> [ClassNames] |
254 | |
255 | Returns the list of classes in method dispatch order, with duplicates removed. |
256 | |
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257 | =head2 clone_object Instance -> Instance |
258 | |
259 | Clones the given C<Instance> which must be an instance governed by this |
260 | metaclass. |
261 | |
262 | =head2 clone_instance Instance, Parameters -> Instance |
263 | |
264 | Clones the given C<Instance> and sets any additional parameters. |
265 | |
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266 | =cut |
267 | |