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 | |
c46b802b |
72 | # ... these functions have to touch the symbol table itself,.. yuk |
73 | |
a5e51f0b |
74 | sub add_package_symbol { |
75 | my ($self, $variable, $initial_value) = @_; |
6d5355c3 |
76 | |
a5e51f0b |
77 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
6d5355c3 |
78 | |
a5e51f0b |
79 | no strict 'refs'; |
c20522bd |
80 | no warnings 'redefine', 'misc'; |
c46b802b |
81 | *{$self->name . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value; |
82 | } |
83 | |
84 | sub remove_package_glob { |
85 | my ($self, $name) = @_; |
86 | no strict 'refs'; |
87 | delete ${$self->name . '::'}{$name}; |
a5e51f0b |
88 | } |
6d5355c3 |
89 | |
c46b802b |
90 | # ... these functions deal with stuff on the namespace level |
91 | |
a5e51f0b |
92 | sub has_package_symbol { |
93 | my ($self, $variable) = @_; |
94 | |
95 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
96 | |
c20522bd |
97 | return 0 unless exists $self->namespace->{$name}; |
d852f4d2 |
98 | |
99 | # FIXME: |
100 | # For some really stupid reason |
101 | # a typeglob will have a default |
102 | # value of \undef in the SCALAR |
103 | # slot, so we need to work around |
104 | # this. Which of course means that |
105 | # if you put \undef in your scalar |
106 | # then this is broken. |
107 | |
108 | if ($type eq 'SCALAR') { |
109 | my $val = *{$self->namespace->{$name}}{$type}; |
110 | defined $$val ? 1 : 0; |
111 | } |
112 | else { |
113 | defined *{$self->namespace->{$name}}{$type} ? 1 : 0; |
114 | } |
a5e51f0b |
115 | } |
116 | |
117 | sub get_package_symbol { |
118 | my ($self, $variable) = @_; |
119 | |
120 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
121 | |
c20522bd |
122 | $self->add_package_symbol($variable) |
123 | unless exists $self->namespace->{$name}; |
124 | return *{$self->namespace->{$name}}{$type}; |
a5e51f0b |
125 | } |
126 | |
127 | sub remove_package_symbol { |
128 | my ($self, $variable) = @_; |
129 | |
130 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
131 | |
c46b802b |
132 | # FIXME: |
133 | # no doubt this is grossly inefficient and |
134 | # could be done much easier and faster in XS |
135 | |
136 | my ($scalar, $array, $hash, $code); |
a5e51f0b |
137 | if ($type eq 'SCALAR') { |
c46b802b |
138 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
139 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
140 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
141 | } |
142 | elsif ($type eq 'ARRAY') { |
c46b802b |
143 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
144 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
145 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
146 | } |
147 | elsif ($type eq 'HASH') { |
c46b802b |
148 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
149 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
150 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
151 | } |
152 | elsif ($type eq 'CODE') { |
c46b802b |
153 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
154 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
155 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
a5e51f0b |
156 | } |
157 | else { |
158 | confess "This should never ever ever happen"; |
7f436b8c |
159 | } |
c46b802b |
160 | |
161 | $self->remove_package_glob($name); |
162 | |
163 | $self->add_package_symbol(('$' . $name) => $scalar) if defined $scalar; |
164 | $self->add_package_symbol(('@' . $name) => $array) if defined $array; |
165 | $self->add_package_symbol(('%' . $name) => $hash) if defined $hash; |
166 | $self->add_package_symbol(('&' . $name) => $code) if defined $code; |
9d6dce77 |
167 | } |
c0cbf4d9 |
168 | |
9d6dce77 |
169 | sub list_all_package_symbols { |
170 | my ($self) = @_; |
a5e51f0b |
171 | return keys %{$self->namespace}; |
6d5355c3 |
172 | } |
173 | |
2243a22b |
174 | 1; |
175 | |
176 | __END__ |
177 | |
178 | =pod |
179 | |
180 | =head1 NAME |
181 | |
182 | Class::MOP::Package - Package Meta Object |
183 | |
184 | =head1 SYNOPSIS |
185 | |
186 | =head1 DESCRIPTION |
187 | |
188 | =head1 METHODS |
189 | |
190 | =over 4 |
191 | |
192 | =item B<meta> |
193 | |
6d5355c3 |
194 | =item B<initialize> |
195 | |
196 | =item B<name> |
197 | |
a5e51f0b |
198 | =item B<namespace> |
199 | |
58d75218 |
200 | =item B<add_package_symbol> |
6d5355c3 |
201 | |
58d75218 |
202 | =item B<get_package_symbol> |
6d5355c3 |
203 | |
58d75218 |
204 | =item B<has_package_symbol> |
6d5355c3 |
205 | |
58d75218 |
206 | =item B<remove_package_symbol> |
6d5355c3 |
207 | |
c46b802b |
208 | =item B<remove_package_glob> |
209 | |
9d6dce77 |
210 | =item B<list_all_package_symbols> |
211 | |
2243a22b |
212 | =back |
213 | |
1a09d9cc |
214 | =head1 AUTHORS |
2243a22b |
215 | |
216 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
217 | |
1a09d9cc |
218 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
219 | |
2243a22b |
220 | =head1 COPYRIGHT AND LICENSE |
221 | |
222 | Copyright 2006 by Infinity Interactive, Inc. |
223 | |
224 | L<http://www.iinteractive.com> |
225 | |
226 | This library is free software; you can redistribute it and/or modify |
227 | it under the same terms as Perl itself. |
228 | |
229 | =cut |