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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::Util qw/get_linear_isa blessed/; |
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7 | use Carp 'confess'; |
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8 | |
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9 | do { |
10 | my %METACLASS_CACHE; |
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11 | |
12 | # because Mouse doesn't introspect existing classes, we're forced to |
13 | # only pay attention to other Mouse classes |
14 | sub _metaclass_cache { |
15 | my $class = shift; |
16 | my $name = shift; |
17 | return $METACLASS_CACHE{$name}; |
18 | } |
19 | |
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20 | sub initialize { |
21 | my $class = shift; |
22 | my $name = shift; |
23 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
24 | if !exists($METACLASS_CACHE{$name}); |
25 | return $METACLASS_CACHE{$name}; |
26 | } |
27 | }; |
28 | |
29 | sub new { |
30 | my $class = shift; |
6cbacbf6 |
31 | my %args = @_; |
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32 | |
33 | $args{attributes} = {}; |
34 | $args{superclasses} = do { |
35 | no strict 'refs'; |
36 | \@{ $args{name} . '::ISA' }; |
37 | }; |
38 | |
39 | bless \%args, $class; |
40 | } |
41 | |
42 | sub name { $_[0]->{name} } |
43 | |
44 | sub superclasses { |
45 | my $self = shift; |
46 | |
47 | if (@_) { |
48 | Mouse::load_class($_) for @_; |
49 | @{ $self->{superclasses} } = @_; |
50 | } |
51 | |
52 | @{ $self->{superclasses} }; |
53 | } |
54 | |
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55 | sub add_method { |
56 | my $self = shift; |
57 | my $name = shift; |
58 | my $code = shift; |
59 | |
60 | my $pkg = $self->name; |
61 | |
62 | no strict 'refs'; |
63 | *{ $pkg . '::' . $name } = $code; |
64 | } |
65 | |
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66 | # copied from Class::Inspector |
67 | sub get_method_list { |
68 | my $self = shift; |
69 | my $name = $self->name; |
70 | |
71 | no strict 'refs'; |
72 | # Get all the CODE symbol table entries |
73 | my @functions = grep !/^meta$/, |
74 | grep { /\A[^\W\d]\w*\z/o } |
75 | grep { defined &{"${name}::$_"} } |
76 | keys %{"${name}::"}; |
77 | wantarray ? @functions : \@functions; |
78 | } |
79 | |
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80 | sub add_attribute { |
81 | my $self = shift; |
82 | my $attr = shift; |
83 | |
84 | $self->{'attributes'}{$attr->name} = $attr; |
85 | } |
86 | |
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87 | sub compute_all_applicable_attributes { |
88 | my $self = shift; |
89 | my (@attr, %seen); |
90 | |
91 | for my $class ($self->linearized_isa) { |
92 | my $meta = $self->_metaclass_cache($class) |
93 | or next; |
94 | |
95 | for my $name (keys %{ $meta->get_attribute_map }) { |
96 | next if $seen{$name}++; |
97 | push @attr, $meta->get_attribute($name); |
98 | } |
99 | } |
100 | |
101 | return @attr; |
102 | } |
103 | |
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104 | sub get_attribute_map { $_[0]->{attributes} } |
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105 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
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106 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
107 | |
00ca1c62 |
108 | sub linearized_isa { @{ get_linear_isa($_[0]->name) } } |
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109 | |
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110 | sub clone_object { |
111 | my $class = shift; |
112 | my $instance = shift; |
113 | |
114 | (blessed($instance) && $instance->isa($class->name)) |
1a0f0802 |
115 | || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; |
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116 | |
117 | $class->clone_instance($instance, @_); |
118 | } |
119 | |
120 | sub clone_instance { |
121 | my ($class, $instance, %params) = @_; |
122 | |
123 | (blessed($instance)) |
e42bee44 |
124 | || confess "You can only clone instances, ($instance) is not a blessed instance"; |
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125 | |
126 | my $clone = bless { %$instance }, ref $instance; |
127 | |
128 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
129 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
130 | if (exists $params{$init_arg}) { |
131 | $clone->{ $attr->name } = $params{$init_arg}; |
132 | } |
133 | } |
134 | } |
135 | |
136 | return $clone; |
137 | |
138 | } |
139 | |
60e2164a |
140 | sub make_immutable {} |
84ef660f |
141 | sub is_immutable { 0 } |
142 | |
143 | sub attribute_metaclass { "Mouse::Meta::Class" } |
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144 | |
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145 | sub add_before_method_modifier { |
146 | my ($self, $name, $code) = @_; |
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147 | require Class::Method::Modifiers; |
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148 | Class::Method::Modifiers::_install_modifier( |
149 | $self->name, |
150 | 'before', |
151 | $name, |
152 | $code, |
153 | ); |
154 | } |
155 | |
156 | sub add_around_method_modifier { |
157 | my ($self, $name, $code) = @_; |
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158 | require Class::Method::Modifiers; |
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159 | Class::Method::Modifiers::_install_modifier( |
160 | $self->name, |
161 | 'around', |
162 | $name, |
163 | $code, |
164 | ); |
165 | } |
166 | |
167 | sub add_after_method_modifier { |
168 | my ($self, $name, $code) = @_; |
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169 | require Class::Method::Modifiers; |
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170 | Class::Method::Modifiers::_install_modifier( |
171 | $self->name, |
172 | 'after', |
173 | $name, |
174 | $code, |
175 | ); |
176 | } |
177 | |
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178 | 1; |
179 | |
180 | __END__ |
181 | |
182 | =head1 NAME |
183 | |
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184 | Mouse::Meta::Class - hook into the Mouse MOP |
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185 | |
186 | =head1 METHODS |
187 | |
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188 | =head2 initialize ClassName -> Mouse::Meta::Class |
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189 | |
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190 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
191 | one instance should exist for a given class. |
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192 | |
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193 | =head2 new %args -> Mouse::Meta::Class |
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194 | |
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195 | Creates a new Mouse::Meta::Class. Don't call this directly. |
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196 | |
197 | =head2 name -> ClassName |
198 | |
199 | Returns the name of the owner class. |
200 | |
201 | =head2 superclasses -> [ClassName] |
202 | |
203 | Gets (or sets) the list of superclasses of the owner class. |
204 | |
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205 | =head2 add_attribute Mouse::Meta::Attribute |
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206 | |
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207 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
208 | class. |
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209 | |
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210 | =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) |
211 | |
212 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
213 | this class and its superclasses. |
214 | |
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215 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
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216 | |
217 | Returns a mapping of attribute names to their corresponding |
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218 | L<Mouse::Meta::Attribute> objects. |
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219 | |
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220 | =head2 has_attribute Name -> Boool |
221 | |
222 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
223 | |
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224 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
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225 | |
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226 | Returns the L<Mouse::Meta::Attribute> with the given name. |
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227 | |
228 | =head2 linearized_isa -> [ClassNames] |
229 | |
230 | Returns the list of classes in method dispatch order, with duplicates removed. |
231 | |
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232 | =head2 clone_object Instance -> Instance |
233 | |
234 | Clones the given C<Instance> which must be an instance governed by this |
235 | metaclass. |
236 | |
237 | =head2 clone_instance Instance, Parameters -> Instance |
238 | |
239 | Clones the given C<Instance> and sets any additional parameters. |
240 | |
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241 | =cut |
242 | |