Commit | Line | Data |
2243a22b |
1 | |
2 | package Class::MOP::Package; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Scalar::Util 'blessed'; |
6d5355c3 |
8 | use Carp 'confess'; |
2243a22b |
9 | |
9d6dce77 |
10 | our $VERSION = '0.02'; |
2243a22b |
11 | |
12 | # introspection |
13 | |
14 | sub meta { |
15 | require Class::MOP::Class; |
16 | Class::MOP::Class->initialize(blessed($_[0]) || $_[0]); |
17 | } |
18 | |
6d5355c3 |
19 | # creation ... |
20 | |
21 | sub initialize { |
9d6dce77 |
22 | my $class = shift; |
23 | my $package_name = shift; |
24 | # we hand-construct the class |
25 | # until we can bootstrap it |
a5e51f0b |
26 | no strict 'refs'; |
27 | return bless { |
28 | '$:package' => $package_name, |
29 | '%:namespace' => \%{$package_name . '::'}, |
30 | } => $class; |
6d5355c3 |
31 | } |
32 | |
33 | # Attributes |
34 | |
35 | # NOTE: |
36 | # all these attribute readers will be bootstrapped |
37 | # away in the Class::MOP bootstrap section |
38 | |
a5e51f0b |
39 | sub name { $_[0]->{'$:package'} } |
40 | sub namespace { $_[0]->{'%:namespace'} } |
6d5355c3 |
41 | |
a5e51f0b |
42 | # utility methods |
6d5355c3 |
43 | |
c0cbf4d9 |
44 | { |
45 | my %SIGIL_MAP = ( |
46 | '$' => 'SCALAR', |
47 | '@' => 'ARRAY', |
48 | '%' => 'HASH', |
49 | '&' => 'CODE', |
50 | ); |
6d5355c3 |
51 | |
a5e51f0b |
52 | sub _deconstruct_variable_name { |
53 | my ($self, $variable) = @_; |
54 | |
c0cbf4d9 |
55 | (defined $variable) |
56 | || confess "You must pass a variable name"; |
a5e51f0b |
57 | |
c0cbf4d9 |
58 | my ($sigil, $name) = ($variable =~ /^(.)(.*)$/); |
a5e51f0b |
59 | |
c0cbf4d9 |
60 | (defined $sigil) |
61 | || confess "The variable name must include a sigil"; |
a5e51f0b |
62 | |
c0cbf4d9 |
63 | (exists $SIGIL_MAP{$sigil}) |
a5e51f0b |
64 | || confess "I do not recognize that sigil '$sigil'"; |
65 | |
66 | return ($name, $sigil, $SIGIL_MAP{$sigil}); |
c0cbf4d9 |
67 | } |
a5e51f0b |
68 | } |
6d5355c3 |
69 | |
a5e51f0b |
70 | # Class attributes |
6d5355c3 |
71 | |
a5e51f0b |
72 | sub add_package_symbol { |
73 | my ($self, $variable, $initial_value) = @_; |
6d5355c3 |
74 | |
a5e51f0b |
75 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
6d5355c3 |
76 | |
a5e51f0b |
77 | no strict 'refs'; |
78 | no warnings 'misc', 'redefine'; |
79 | *{$self->name . '::' . $name} = $initial_value; |
80 | } |
6d5355c3 |
81 | |
a5e51f0b |
82 | sub has_package_symbol { |
83 | my ($self, $variable) = @_; |
84 | |
85 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
86 | |
87 | return 0 unless exists $self->namespace->{$name}; |
88 | defined *{$self->namespace->{$name}}{$type} ? 1 : 0; |
89 | } |
90 | |
91 | sub get_package_symbol { |
92 | my ($self, $variable) = @_; |
93 | |
94 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
95 | |
96 | return *{$self->namespace->{$name}}{$type} |
97 | if exists $self->namespace->{$name}; |
98 | $self->add_package_symbol($variable); |
99 | } |
100 | |
101 | sub remove_package_symbol { |
102 | my ($self, $variable) = @_; |
103 | |
104 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
105 | |
106 | if ($type eq 'SCALAR') { |
107 | undef ${$self->namespace->{$name}}; |
108 | } |
109 | elsif ($type eq 'ARRAY') { |
110 | undef @{$self->namespace->{$name}}; |
111 | } |
112 | elsif ($type eq 'HASH') { |
113 | undef %{$self->namespace->{$name}}; |
114 | } |
115 | elsif ($type eq 'CODE') { |
116 | # FIXME: |
117 | # this is crap, it is probably much |
118 | # easier to write this in XS. |
119 | my ($scalar, @array, %hash); |
120 | $scalar = ${$self->namespace->{$name}} if defined *{$self->namespace->{$name}}{SCALAR}; |
121 | @array = @{$self->namespace->{$name}} if defined *{$self->namespace->{$name}}{ARRAY}; |
122 | %hash = %{$self->namespace->{$name}} if defined *{$self->namespace->{$name}}{HASH}; |
123 | { |
124 | no strict 'refs'; |
9d6dce77 |
125 | delete ${$self->name . '::'}{$name}; |
c0cbf4d9 |
126 | } |
a5e51f0b |
127 | ${$self->namespace->{$name}} = $scalar if defined $scalar; |
128 | @{$self->namespace->{$name}} = @array if scalar @array; |
129 | %{$self->namespace->{$name}} = %hash if keys %hash; |
130 | } |
131 | else { |
132 | confess "This should never ever ever happen"; |
7f436b8c |
133 | } |
9d6dce77 |
134 | } |
c0cbf4d9 |
135 | |
9d6dce77 |
136 | sub list_all_package_symbols { |
137 | my ($self) = @_; |
a5e51f0b |
138 | return keys %{$self->namespace}; |
6d5355c3 |
139 | } |
140 | |
2243a22b |
141 | 1; |
142 | |
143 | __END__ |
144 | |
145 | =pod |
146 | |
147 | =head1 NAME |
148 | |
149 | Class::MOP::Package - Package Meta Object |
150 | |
151 | =head1 SYNOPSIS |
152 | |
153 | =head1 DESCRIPTION |
154 | |
155 | =head1 METHODS |
156 | |
157 | =over 4 |
158 | |
159 | =item B<meta> |
160 | |
6d5355c3 |
161 | =item B<initialize> |
162 | |
163 | =item B<name> |
164 | |
a5e51f0b |
165 | =item B<namespace> |
166 | |
58d75218 |
167 | =item B<add_package_symbol> |
6d5355c3 |
168 | |
58d75218 |
169 | =item B<get_package_symbol> |
6d5355c3 |
170 | |
58d75218 |
171 | =item B<has_package_symbol> |
6d5355c3 |
172 | |
58d75218 |
173 | =item B<remove_package_symbol> |
6d5355c3 |
174 | |
9d6dce77 |
175 | =item B<list_all_package_symbols> |
176 | |
2243a22b |
177 | =back |
178 | |
1a09d9cc |
179 | =head1 AUTHORS |
2243a22b |
180 | |
181 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
182 | |
1a09d9cc |
183 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
184 | |
2243a22b |
185 | =head1 COPYRIGHT AND LICENSE |
186 | |
187 | Copyright 2006 by Infinity Interactive, Inc. |
188 | |
189 | L<http://www.iinteractive.com> |
190 | |
191 | This library is free software; you can redistribute it and/or modify |
192 | it under the same terms as Perl itself. |
193 | |
194 | =cut |