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 | |
d7b2249e |
10 | our $VERSION = '0.08'; |
f0480c45 |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
2243a22b |
12 | |
6e57504d |
13 | use base 'Class::MOP::Object'; |
14 | |
6d5355c3 |
15 | # creation ... |
16 | |
17 | sub initialize { |
9d6dce77 |
18 | my $class = shift; |
19 | my $package_name = shift; |
20 | # we hand-construct the class |
21 | # until we can bootstrap it |
a5e51f0b |
22 | no strict 'refs'; |
23 | return bless { |
c23184fc |
24 | '$!package' => $package_name, |
56dcfc1a |
25 | # NOTE: |
26 | # because of issues with the Perl API |
27 | # to the typeglob in some versions, we |
28 | # need to just always grab a new |
29 | # reference to the hash in the accessor. |
30 | # Ideally we could just store a ref and |
31 | # it would Just Work, but oh well :\ |
c23184fc |
32 | '%!namespace' => \undef, |
a5e51f0b |
33 | } => $class; |
6d5355c3 |
34 | } |
35 | |
36 | # Attributes |
37 | |
38 | # NOTE: |
39 | # all these attribute readers will be bootstrapped |
40 | # away in the Class::MOP bootstrap section |
41 | |
c23184fc |
42 | sub name { $_[0]->{'$!package'} } |
56dcfc1a |
43 | sub namespace { |
44 | # NOTE: |
45 | # because of issues with the Perl API |
46 | # to the typeglob in some versions, we |
47 | # need to just always grab a new |
48 | # reference to the hash here. Ideally |
49 | # we could just store a ref and it would |
50 | # Just Work, but oh well :\ |
51 | no strict 'refs'; |
52 | \%{$_[0]->name . '::'} |
53 | } |
6d5355c3 |
54 | |
a5e51f0b |
55 | # utility methods |
6d5355c3 |
56 | |
c0cbf4d9 |
57 | { |
58 | my %SIGIL_MAP = ( |
59 | '$' => 'SCALAR', |
60 | '@' => 'ARRAY', |
61 | '%' => 'HASH', |
62 | '&' => 'CODE', |
63 | ); |
6d5355c3 |
64 | |
a5e51f0b |
65 | sub _deconstruct_variable_name { |
66 | my ($self, $variable) = @_; |
67 | |
c0cbf4d9 |
68 | (defined $variable) |
69 | || confess "You must pass a variable name"; |
a5e51f0b |
70 | |
f430cfa4 |
71 | my $sigil = substr($variable, 0, 1, ''); |
a5e51f0b |
72 | |
c0cbf4d9 |
73 | (defined $sigil) |
74 | || confess "The variable name must include a sigil"; |
a5e51f0b |
75 | |
c0cbf4d9 |
76 | (exists $SIGIL_MAP{$sigil}) |
a5e51f0b |
77 | || confess "I do not recognize that sigil '$sigil'"; |
78 | |
f430cfa4 |
79 | return ($variable, $sigil, $SIGIL_MAP{$sigil}); |
c0cbf4d9 |
80 | } |
a5e51f0b |
81 | } |
6d5355c3 |
82 | |
a5e51f0b |
83 | # Class attributes |
6d5355c3 |
84 | |
c46b802b |
85 | # ... these functions have to touch the symbol table itself,.. yuk |
86 | |
a5e51f0b |
87 | sub add_package_symbol { |
88 | my ($self, $variable, $initial_value) = @_; |
6d5355c3 |
89 | |
a5e51f0b |
90 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
6d5355c3 |
91 | |
a5e51f0b |
92 | no strict 'refs'; |
56dcfc1a |
93 | no warnings 'redefine', 'misc'; |
94 | *{$self->name . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value; |
c46b802b |
95 | } |
96 | |
97 | sub remove_package_glob { |
98 | my ($self, $name) = @_; |
99 | no strict 'refs'; |
100 | delete ${$self->name . '::'}{$name}; |
a5e51f0b |
101 | } |
6d5355c3 |
102 | |
c46b802b |
103 | # ... these functions deal with stuff on the namespace level |
104 | |
a5e51f0b |
105 | sub has_package_symbol { |
106 | my ($self, $variable) = @_; |
107 | |
108 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
56dcfc1a |
109 | |
c20522bd |
110 | return 0 unless exists $self->namespace->{$name}; |
d852f4d2 |
111 | |
112 | # FIXME: |
113 | # For some really stupid reason |
114 | # a typeglob will have a default |
115 | # value of \undef in the SCALAR |
116 | # slot, so we need to work around |
117 | # this. Which of course means that |
118 | # if you put \undef in your scalar |
119 | # then this is broken. |
92af7fdf |
120 | |
121 | if (ref($self->namespace->{$name}) eq 'SCALAR') { |
122 | return ($type eq 'CODE' ? 1 : 0); |
123 | } |
124 | elsif ($type eq 'SCALAR') { |
d852f4d2 |
125 | my $val = *{$self->namespace->{$name}}{$type}; |
92af7fdf |
126 | return defined(${$val}) ? 1 : 0; |
d852f4d2 |
127 | } |
128 | else { |
56dcfc1a |
129 | defined(*{$self->namespace->{$name}}{$type}) ? 1 : 0; |
d852f4d2 |
130 | } |
a5e51f0b |
131 | } |
132 | |
133 | sub get_package_symbol { |
134 | my ($self, $variable) = @_; |
135 | |
136 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
137 | |
c20522bd |
138 | $self->add_package_symbol($variable) |
139 | unless exists $self->namespace->{$name}; |
92af7fdf |
140 | |
141 | if (ref($self->namespace->{$name}) eq 'SCALAR') { |
142 | if ($type eq 'CODE') { |
143 | no strict 'refs'; |
144 | return \&{$self->name.'::'.$name}; |
145 | } |
146 | else { |
147 | return undef; |
148 | } |
149 | } |
150 | else { |
151 | return *{$self->namespace->{$name}}{$type}; |
152 | } |
a5e51f0b |
153 | } |
154 | |
155 | sub remove_package_symbol { |
156 | my ($self, $variable) = @_; |
157 | |
158 | my ($name, $sigil, $type) = $self->_deconstruct_variable_name($variable); |
159 | |
c46b802b |
160 | # FIXME: |
161 | # no doubt this is grossly inefficient and |
162 | # could be done much easier and faster in XS |
163 | |
164 | my ($scalar, $array, $hash, $code); |
a5e51f0b |
165 | if ($type eq 'SCALAR') { |
c46b802b |
166 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
167 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
168 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
169 | } |
170 | elsif ($type eq 'ARRAY') { |
c46b802b |
171 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
172 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
173 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
174 | } |
175 | elsif ($type eq 'HASH') { |
c46b802b |
176 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
177 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
178 | $code = $self->get_package_symbol('&' . $name) if $self->has_package_symbol('&' . $name); |
a5e51f0b |
179 | } |
180 | elsif ($type eq 'CODE') { |
c46b802b |
181 | $scalar = $self->get_package_symbol('$' . $name) if $self->has_package_symbol('$' . $name); |
182 | $array = $self->get_package_symbol('@' . $name) if $self->has_package_symbol('@' . $name); |
183 | $hash = $self->get_package_symbol('%' . $name) if $self->has_package_symbol('%' . $name); |
a5e51f0b |
184 | } |
185 | else { |
186 | confess "This should never ever ever happen"; |
7f436b8c |
187 | } |
c46b802b |
188 | |
189 | $self->remove_package_glob($name); |
190 | |
191 | $self->add_package_symbol(('$' . $name) => $scalar) if defined $scalar; |
192 | $self->add_package_symbol(('@' . $name) => $array) if defined $array; |
193 | $self->add_package_symbol(('%' . $name) => $hash) if defined $hash; |
194 | $self->add_package_symbol(('&' . $name) => $code) if defined $code; |
9d6dce77 |
195 | } |
c0cbf4d9 |
196 | |
9d6dce77 |
197 | sub list_all_package_symbols { |
92330ee2 |
198 | my ($self, $type_filter) = @_; |
199 | return keys %{$self->namespace} unless defined $type_filter; |
91e0eb4a |
200 | # NOTE: |
92330ee2 |
201 | # or we can filter based on |
202 | # type (SCALAR|ARRAY|HASH|CODE) |
203 | my $namespace = $self->namespace; |
91e0eb4a |
204 | return grep { |
92af7fdf |
205 | (ref($namespace->{$_}) |
206 | ? (ref($namespace->{$_}) eq 'SCALAR' && $type_filter eq 'CODE') |
207 | : (ref(\$namespace->{$_}) eq 'GLOB' |
208 | && defined(*{$namespace->{$_}}{$type_filter}))); |
91e0eb4a |
209 | } keys %{$namespace}; |
6d5355c3 |
210 | } |
211 | |
2243a22b |
212 | 1; |
213 | |
214 | __END__ |
215 | |
216 | =pod |
217 | |
218 | =head1 NAME |
219 | |
220 | Class::MOP::Package - Package Meta Object |
221 | |
2243a22b |
222 | =head1 DESCRIPTION |
223 | |
127d39a7 |
224 | This is an abstraction of a Perl 5 package, it is a superclass of |
225 | L<Class::MOP::Class> and provides all of the symbol table |
226 | introspection methods. |
227 | |
2243a22b |
228 | =head1 METHODS |
229 | |
230 | =over 4 |
231 | |
232 | =item B<meta> |
233 | |
127d39a7 |
234 | Returns a metaclass for this package. |
235 | |
b9d9fc0b |
236 | =item B<initialize ($package_name)> |
6d5355c3 |
237 | |
127d39a7 |
238 | This will initialize a Class::MOP::Package instance which represents |
239 | the package of C<$package_name>. |
240 | |
6d5355c3 |
241 | =item B<name> |
242 | |
b9d9fc0b |
243 | This is a read-only attribute which returns the package name for the |
244 | given instance. |
245 | |
a5e51f0b |
246 | =item B<namespace> |
247 | |
b9d9fc0b |
248 | This returns a HASH reference to the symbol table. The keys of the |
249 | HASH are the symbol names, and the values are typeglob references. |
250 | |
251 | =item B<add_package_symbol ($variable_name, ?$initial_value)> |
252 | |
253 | Given a C<$variable_name>, which must contain a leading sigil, this |
254 | method will create that variable within the package which houses the |
255 | class. It also takes an optional C<$initial_value>, which must be a |
256 | reference of the same type as the sigil of the C<$variable_name> |
257 | implies. |
258 | |
259 | =item B<get_package_symbol ($variable_name)> |
6d5355c3 |
260 | |
b9d9fc0b |
261 | This will return a reference to the package variable in |
262 | C<$variable_name>. |
6d5355c3 |
263 | |
b9d9fc0b |
264 | =item B<has_package_symbol ($variable_name)> |
6d5355c3 |
265 | |
b9d9fc0b |
266 | Returns true (C<1>) if there is a package variable defined for |
267 | C<$variable_name>, and false (C<0>) otherwise. |
6d5355c3 |
268 | |
b9d9fc0b |
269 | =item B<remove_package_symbol ($variable_name)> |
270 | |
271 | This will attempt to remove the package variable at C<$variable_name>. |
272 | |
273 | =item B<remove_package_glob ($glob_name)> |
274 | |
275 | This will attempt to remove the entire typeglob associated with |
276 | C<$glob_name> from the package. |
c46b802b |
277 | |
92330ee2 |
278 | =item B<list_all_package_symbols (?$type_filter)> |
9d6dce77 |
279 | |
b9d9fc0b |
280 | This will list all the glob names associated with the current package. |
281 | By inspecting the globs returned you can discern all the variables in |
282 | the package. |
283 | |
92330ee2 |
284 | By passing a C<$type_filter>, you can limit the list to only those |
285 | which match the filter (either SCALAR, ARRAY, HASH or CODE). |
286 | |
2243a22b |
287 | =back |
288 | |
1a09d9cc |
289 | =head1 AUTHORS |
2243a22b |
290 | |
291 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
292 | |
293 | =head1 COPYRIGHT AND LICENSE |
294 | |
69e3ab0a |
295 | Copyright 2006-2008 by Infinity Interactive, Inc. |
2243a22b |
296 | |
297 | L<http://www.iinteractive.com> |
298 | |
299 | This library is free software; you can redistribute it and/or modify |
300 | it under the same terms as Perl itself. |
301 | |
92af7fdf |
302 | =cut |