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a2227e71 |
1 | #!/usr/bin/env perl |
2 | package Mouse::Meta::Role; |
3 | use strict; |
4 | use warnings; |
59089ec3 |
5 | use Carp 'confess'; |
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6 | |
acf0f643 |
7 | do { |
8 | my %METACLASS_CACHE; |
9 | |
10 | # because Mouse doesn't introspect existing classes, we're forced to |
11 | # only pay attention to other Mouse classes |
12 | sub _metaclass_cache { |
13 | my $class = shift; |
14 | my $name = shift; |
15 | return $METACLASS_CACHE{$name}; |
16 | } |
17 | |
18 | sub initialize { |
19 | my $class = shift; |
20 | my $name = shift; |
21 | $METACLASS_CACHE{$name} = $class->new(name => $name) |
22 | if !exists($METACLASS_CACHE{$name}); |
23 | return $METACLASS_CACHE{$name}; |
24 | } |
25 | }; |
26 | |
27 | sub new { |
28 | my $class = shift; |
29 | my %args = @_; |
30 | |
59089ec3 |
31 | $args{attributes} ||= {}; |
32 | $args{required_methods} ||= []; |
47f36c05 |
33 | $args{roles} ||= []; |
274b6cce |
34 | |
acf0f643 |
35 | bless \%args, $class; |
36 | } |
a2227e71 |
37 | |
513854c7 |
38 | sub name { $_[0]->{name} } |
39 | |
59089ec3 |
40 | sub add_required_methods { |
41 | my $self = shift; |
42 | my @methods = @_; |
43 | push @{$self->{required_methods}}, @methods; |
44 | } |
45 | |
274b6cce |
46 | sub add_attribute { |
47 | my $self = shift; |
48 | my $name = shift; |
69ac1dcf |
49 | my $spec = shift; |
50 | $self->{attributes}->{$name} = $spec; |
da0c885d |
51 | } |
52 | |
274b6cce |
53 | sub has_attribute { exists $_[0]->{attributes}->{$_[1]} } |
54 | sub get_attribute_list { keys %{ $_[0]->{attributes} } } |
69ac1dcf |
55 | sub get_attribute { $_[0]->{attributes}->{$_[1]} } |
274b6cce |
56 | |
2e92bb89 |
57 | # copied from Class::Inspector |
58 | sub get_method_list { |
59 | my $self = shift; |
60 | my $name = $self->name; |
61 | |
62 | no strict 'refs'; |
63 | # Get all the CODE symbol table entries |
64 | my @functions = grep !/^meta$/, |
65 | grep { /\A[^\W\d]\w*\z/o } |
66 | grep { defined &{"${name}::$_"} } |
67 | keys %{"${name}::"}; |
68 | wantarray ? @functions : \@functions; |
69 | } |
70 | |
da0c885d |
71 | sub apply { |
72 | my $self = shift; |
2e92bb89 |
73 | my $selfname = $self->name; |
da0c885d |
74 | my $class = shift; |
2e92bb89 |
75 | my $classname = $class->name; |
4aaa2ed6 |
76 | my %args = @_; |
da0c885d |
77 | |
4aaa2ed6 |
78 | if ($class->isa('Mouse::Meta::Class')) { |
79 | for my $name (@{$self->{required_methods}}) { |
80 | unless ($classname->can($name)) { |
81 | confess "'$selfname' requires the method '$name' to be implemented by '$classname'"; |
82 | } |
2e92bb89 |
83 | } |
84 | } |
85 | |
86 | { |
87 | no strict 'refs'; |
88 | for my $name ($self->get_method_list) { |
89 | next if $name eq 'has' || $name eq 'requires' || $name eq 'meta' || $name eq 'with' || $name eq 'around' || $name eq 'before' || $name eq 'after' || $name eq 'blessed' || $name eq 'extends' || $name eq 'confess' || $name eq 'excludes'; |
4aaa2ed6 |
90 | my $dstname = $args{alias} ? ($args{alias}->{$name}||$name) : $name; |
91 | if ($classname->can($dstname)) { |
2e92bb89 |
92 | # XXX what's Moose's behavior? |
93 | next; |
94 | } |
4aaa2ed6 |
95 | *{"${classname}::${dstname}"} = *{"${selfname}::${name}"}; |
59089ec3 |
96 | } |
97 | } |
98 | |
b1b81553 |
99 | if ($class->isa('Mouse::Meta::Class')) { |
100 | # apply role to class |
101 | for my $name ($self->get_attribute_list) { |
102 | next if $class->has_attribute($name); |
103 | my $spec = $self->get_attribute($name); |
104 | Mouse::Meta::Attribute->create($class, $name, %$spec); |
105 | } |
106 | } else { |
107 | # apply role to role |
108 | # XXX Room for speed improvement |
109 | for my $name ($self->get_attribute_list) { |
110 | next if $class->has_attribute($name); |
111 | my $spec = $self->get_attribute($name); |
112 | $class->add_attribute($name, $spec); |
113 | } |
da0c885d |
114 | } |
d99db7b6 |
115 | |
b1b81553 |
116 | # XXX Room for speed improvement in role to role |
d99db7b6 |
117 | for my $modifier_type (qw/before after around/) { |
118 | my $add_method = "add_${modifier_type}_method_modifier"; |
119 | my $modified = $self->{"${modifier_type}_method_modifiers"}; |
120 | |
121 | for my $method_name (keys %$modified) { |
122 | for my $code (@{ $modified->{$method_name} }) { |
123 | $class->$add_method($method_name => $code); |
124 | } |
125 | } |
126 | } |
47f36c05 |
127 | |
128 | # append roles |
129 | push @{ $class->roles }, $self, @{ $self->roles }; |
da0c885d |
130 | } |
0fc8adbc |
131 | |
c2f128e7 |
132 | for my $modifier_type (qw/before after around/) { |
133 | no strict 'refs'; |
fc0e0bbd |
134 | *{ __PACKAGE__ . '::' . "add_${modifier_type}_method_modifier" } = sub { |
135 | my ($self, $method_name, $method) = @_; |
136 | |
137 | push @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} }, |
138 | $method; |
139 | }; |
140 | |
c2f128e7 |
141 | *{ __PACKAGE__ . '::' . "get_${modifier_type}_method_modifiers" } = sub { |
142 | my ($self, $method_name, $method) = @_; |
143 | @{ $self->{"${modifier_type}_method_modifiers"}->{$method_name} || [] } |
144 | }; |
145 | } |
146 | |
47f36c05 |
147 | sub roles { $_[0]->{roles} } |
148 | |
a2227e71 |
149 | 1; |
150 | |