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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 Scalar::Util 'blessed'; |
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7 | use Carp 'confess'; |
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8 | |
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9 | use MRO::Compat; |
10 | |
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; |
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33 | my %args = @_; |
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34 | |
35 | $args{attributes} = {}; |
36 | $args{superclasses} = do { |
37 | no strict 'refs'; |
38 | \@{ $args{name} . '::ISA' }; |
39 | }; |
40 | |
41 | bless \%args, $class; |
42 | } |
43 | |
44 | sub name { $_[0]->{name} } |
45 | |
46 | sub superclasses { |
47 | my $self = shift; |
48 | |
49 | if (@_) { |
50 | Mouse::load_class($_) for @_; |
51 | @{ $self->{superclasses} } = @_; |
52 | } |
53 | |
54 | @{ $self->{superclasses} }; |
55 | } |
56 | |
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57 | sub add_method { |
58 | my $self = shift; |
59 | my $name = shift; |
60 | my $code = shift; |
61 | |
62 | my $pkg = $self->name; |
63 | |
64 | no strict 'refs'; |
65 | *{ $pkg . '::' . $name } = $code; |
66 | } |
67 | |
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68 | sub add_attribute { |
69 | my $self = shift; |
70 | my $attr = shift; |
71 | |
72 | $self->{'attributes'}{$attr->name} = $attr; |
73 | } |
74 | |
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75 | sub compute_all_applicable_attributes { |
76 | my $self = shift; |
77 | my (@attr, %seen); |
78 | |
79 | for my $class ($self->linearized_isa) { |
80 | my $meta = $self->_metaclass_cache($class) |
81 | or next; |
82 | |
83 | for my $name (keys %{ $meta->get_attribute_map }) { |
84 | next if $seen{$name}++; |
85 | push @attr, $meta->get_attribute($name); |
86 | } |
87 | } |
88 | |
89 | return @attr; |
90 | } |
91 | |
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92 | sub get_attribute_map { $_[0]->{attributes} } |
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93 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
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94 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
95 | |
96 | sub linearized_isa { @{ mro::get_linear_isa($_[0]->name) } } |
97 | |
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98 | sub clone_object { |
99 | my $class = shift; |
100 | my $instance = shift; |
101 | |
102 | (blessed($instance) && $instance->isa($class->name)) |
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103 | || confess "You must pass an instance of the metaclass (" . $class->name . "), not ($instance)"; |
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104 | |
105 | $class->clone_instance($instance, @_); |
106 | } |
107 | |
108 | sub clone_instance { |
109 | my ($class, $instance, %params) = @_; |
110 | |
111 | (blessed($instance)) |
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112 | || confess "You can only clone instances, ($instance) is not a blessed instance"; |
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113 | |
114 | my $clone = bless { %$instance }, ref $instance; |
115 | |
116 | foreach my $attr ($class->compute_all_applicable_attributes()) { |
117 | if ( defined( my $init_arg = $attr->init_arg ) ) { |
118 | if (exists $params{$init_arg}) { |
119 | $clone->{ $attr->name } = $params{$init_arg}; |
120 | } |
121 | } |
122 | } |
123 | |
124 | return $clone; |
125 | |
126 | } |
127 | |
128 | |
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129 | 1; |
130 | |
131 | __END__ |
132 | |
133 | =head1 NAME |
134 | |
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135 | Mouse::Meta::Class - hook into the Mouse MOP |
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136 | |
137 | =head1 METHODS |
138 | |
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139 | =head2 initialize ClassName -> Mouse::Meta::Class |
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140 | |
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141 | Finds or creates a Mouse::Meta::Class instance for the given ClassName. Only |
142 | one instance should exist for a given class. |
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143 | |
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144 | =head2 new %args -> Mouse::Meta::Class |
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145 | |
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146 | Creates a new Mouse::Meta::Class. Don't call this directly. |
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147 | |
148 | =head2 name -> ClassName |
149 | |
150 | Returns the name of the owner class. |
151 | |
152 | =head2 superclasses -> [ClassName] |
153 | |
154 | Gets (or sets) the list of superclasses of the owner class. |
155 | |
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156 | =head2 add_attribute Mouse::Meta::Attribute |
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157 | |
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158 | Begins keeping track of the existing L<Mouse::Meta::Attribute> for the owner |
159 | class. |
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160 | |
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161 | =head2 compute_all_applicable_attributes -> (Mouse::Meta::Attribute) |
162 | |
163 | Returns the list of all L<Mouse::Meta::Attribute> instances associated with |
164 | this class and its superclasses. |
165 | |
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166 | =head2 get_attribute_map -> { name => Mouse::Meta::Attribute } |
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167 | |
168 | Returns a mapping of attribute names to their corresponding |
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169 | L<Mouse::Meta::Attribute> objects. |
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170 | |
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171 | =head2 has_attribute Name -> Boool |
172 | |
173 | Returns whether we have a L<Mouse::Meta::Attribute> with the given name. |
174 | |
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175 | =head2 get_attribute Name -> Mouse::Meta::Attribute | undef |
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176 | |
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177 | Returns the L<Mouse::Meta::Attribute> with the given name. |
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178 | |
179 | =head2 linearized_isa -> [ClassNames] |
180 | |
181 | Returns the list of classes in method dispatch order, with duplicates removed. |
182 | |
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183 | =head2 clone_object Instance -> Instance |
184 | |
185 | Clones the given C<Instance> which must be an instance governed by this |
186 | metaclass. |
187 | |
188 | =head2 clone_instance Instance, Parameters -> Instance |
189 | |
190 | Clones the given C<Instance> and sets any additional parameters. |
191 | |
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192 | =cut |
193 | |