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8b978dd5 |
1 | |
2 | package Class::MOP::Class; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Carp 'confess'; |
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8 | use Scalar::Util 'blessed', 'reftype'; |
8b978dd5 |
9 | use Sub::Name 'subname'; |
10 | use B 'svref_2object'; |
11 | |
12 | our $VERSION = '0.01'; |
13 | |
14 | # Creation |
15 | |
bfe4d0fc |
16 | { |
17 | # Metaclasses are singletons, so we cache them here. |
18 | # there is no need to worry about destruction though |
19 | # because they should die only when the program dies. |
20 | # After all, do package definitions even get reaped? |
21 | my %METAS; |
22 | sub initialize { |
23 | my ($class, $package_name) = @_; |
24 | (defined $package_name && $package_name) |
25 | || confess "You must pass a package name"; |
26 | $METAS{$package_name} ||= bless \$package_name => blessed($class) || $class; |
27 | } |
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28 | } |
29 | |
30 | sub create { |
31 | my ($class, $package_name, $package_version, %options) = @_; |
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32 | (defined $package_name && $package_name) |
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33 | || confess "You must pass a package name"; |
34 | my $code = "package $package_name;"; |
35 | $code .= "\$$package_name\:\:VERSION = '$package_version';" |
36 | if defined $package_version; |
37 | eval $code; |
38 | confess "creation of $package_name failed : $@" if $@; |
bfe4d0fc |
39 | my $meta = $class->initialize($package_name); |
8b978dd5 |
40 | $meta->superclasses(@{$options{superclasses}}) |
41 | if exists $options{superclasses}; |
bfe4d0fc |
42 | if (exists $options{methods}) { |
43 | foreach my $method_name (keys %{$options{methods}}) { |
44 | $meta->add_method($method_name, $options{methods}->{$method_name}); |
45 | } |
46 | } |
8b978dd5 |
47 | return $meta; |
48 | } |
49 | |
50 | # Informational |
51 | |
52 | sub name { ${$_[0]} } |
53 | |
54 | sub version { |
55 | my $self = shift; |
56 | no strict 'refs'; |
57 | ${$self->name . '::VERSION'}; |
58 | } |
59 | |
60 | # Inheritance |
61 | |
62 | sub superclasses { |
63 | my $self = shift; |
64 | no strict 'refs'; |
65 | if (@_) { |
66 | my @supers = @_; |
67 | @{$self->name . '::ISA'} = @supers; |
68 | } |
69 | @{$self->name . '::ISA'}; |
70 | } |
71 | |
72 | sub class_precedence_list { |
73 | my $self = shift; |
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74 | # NOTE: |
75 | # We need to check for ciruclar inheirtance here. |
76 | # This will do nothing if all is well, and blow |
77 | # up otherwise. Yes, it's an ugly hack, better |
78 | # suggestions are welcome. |
79 | { $self->name->isa('This is a test for circular inheritance') } |
80 | # ... and no back to our regularly scheduled program |
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81 | ( |
82 | $self->name, |
83 | map { |
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84 | $self->initialize($_)->class_precedence_list() |
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85 | } $self->superclasses() |
86 | ); |
87 | } |
88 | |
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89 | ## Methods |
90 | |
91 | sub add_method { |
92 | my ($self, $method_name, $method) = @_; |
93 | (defined $method_name && $method_name) |
94 | || confess "You must define a method name"; |
95 | (reftype($method) && reftype($method) eq 'CODE') |
96 | || confess "Your code block must be a CODE reference"; |
97 | my $full_method_name = ($self->name . '::' . $method_name); |
98 | |
99 | no strict 'refs'; |
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100 | no warnings 'redefine'; |
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101 | *{$full_method_name} = subname $full_method_name => $method; |
102 | } |
103 | |
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104 | { |
105 | |
106 | ## private utility functions for has_method |
107 | my $_find_subroutine_package_name = sub { eval { svref_2object($_[0])->GV->STASH->NAME } }; |
108 | my $_find_subroutine_name = sub { eval { svref_2object($_[0])->GV->NAME } }; |
109 | |
110 | sub has_method { |
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111 | my ($self, $method_name) = @_; |
bfe4d0fc |
112 | (defined $method_name && $method_name) |
113 | || confess "You must define a method name"; |
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114 | |
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115 | my $sub_name = ($self->name . '::' . $method_name); |
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116 | |
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117 | no strict 'refs'; |
118 | return 0 if !defined(&{$sub_name}); |
119 | return 0 if $_find_subroutine_package_name->(\&{$sub_name}) ne $self->name && |
120 | $_find_subroutine_name->(\&{$sub_name}) ne '__ANON__'; |
121 | return 1; |
122 | } |
123 | |
0882828e |
124 | } |
125 | |
126 | sub get_method { |
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127 | my ($self, $method_name) = @_; |
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128 | (defined $method_name && $method_name) |
129 | || confess "You must define a method name"; |
130 | |
131 | no strict 'refs'; |
132 | return \&{$self->name . '::' . $method_name} |
bfe4d0fc |
133 | if $self->has_method($method_name); |
c9b8b7f9 |
134 | return; # <- make sure to return undef |
135 | } |
136 | |
137 | sub remove_method { |
138 | my ($self, $method_name) = @_; |
139 | (defined $method_name && $method_name) |
140 | || confess "You must define a method name"; |
141 | |
142 | my $removed_method = $self->get_method($method_name); |
143 | |
144 | no strict 'refs'; |
145 | delete ${$self->name . '::'}{$method_name} |
146 | if defined $removed_method; |
147 | |
148 | return $removed_method; |
149 | } |
150 | |
151 | sub get_method_list { |
152 | my $self = shift; |
153 | no strict 'refs'; |
154 | grep { |
155 | defined &{$self->name . '::' . $_} && $self->has_method($_) |
156 | } %{$self->name . '::'}; |
8b978dd5 |
157 | } |
158 | |
159 | 1; |
160 | |
161 | __END__ |
162 | |
163 | =pod |
164 | |
165 | =head1 NAME |
166 | |
167 | Class::MOP::Class - Class Meta Object |
168 | |
169 | =head1 SYNOPSIS |
170 | |
171 | =head1 DESCRIPTION |
172 | |
173 | =head1 AUTHOR |
174 | |
175 | Stevan Little E<gt>stevan@iinteractive.comE<lt> |
176 | |
177 | =head1 COPYRIGHT AND LICENSE |
178 | |
179 | Copyright 2006 by Infinity Interactive, Inc. |
180 | |
181 | L<http://www.iinteractive.com> |
182 | |
183 | This library is free software; you can redistribute it and/or modify |
184 | it under the same terms as Perl itself. |
185 | |
186 | =cut |