Commit | Line | Data |
2243a22b |
1 | |
2 | package Class::MOP::Package; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
b1cd37c2 |
7 | use B; |
2243a22b |
8 | use Scalar::Util 'blessed'; |
6d5355c3 |
9 | use Carp 'confess'; |
2243a22b |
10 | |
34147f49 |
11 | our $VERSION = '0.71_01'; |
d519662a |
12 | $VERSION = eval $VERSION; |
f0480c45 |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
2243a22b |
14 | |
6e57504d |
15 | use base 'Class::MOP::Object'; |
16 | |
6d5355c3 |
17 | # creation ... |
18 | |
19 | sub initialize { |
3be6bc1c |
20 | my ( $class, @args ) = @_; |
21 | |
22 | unshift @args, "package" if @args % 2; |
23 | |
24 | my %options = @args; |
25 | my $package_name = $options{package}; |
26 | |
27 | |
9d6dce77 |
28 | # we hand-construct the class |
29 | # until we can bootstrap it |
a19fcb5b |
30 | if ( my $meta = Class::MOP::get_metaclass_by_name($package_name) ) { |
973de492 |
31 | return $meta; |
a19fcb5b |
32 | } else { |
973de492 |
33 | my $meta = ( ref $class || $class )->_new({ |
34 | 'package' => $package_name, |
35 | }); |
a19fcb5b |
36 | |
973de492 |
37 | Class::MOP::store_metaclass_by_name($package_name, $meta); |
a19fcb5b |
38 | |
973de492 |
39 | return $meta; |
a19fcb5b |
40 | } |
41 | } |
42 | |
43 | sub reinitialize { |
3be6bc1c |
44 | my ( $class, @args ) = @_; |
45 | |
46 | unshift @args, "package" if @args % 2; |
47 | |
48 | my %options = @args; |
3eda22f8 |
49 | my $package_name = delete $options{package}; |
3be6bc1c |
50 | |
a19fcb5b |
51 | (defined $package_name && $package_name && !blessed($package_name)) |
52 | || confess "You must pass a package name and it cannot be blessed"; |
3be6bc1c |
53 | |
a19fcb5b |
54 | Class::MOP::remove_metaclass_by_name($package_name); |
3be6bc1c |
55 | |
3eda22f8 |
56 | $class->initialize($package_name, %options); # call with first arg form for compat |
682655a3 |
57 | } |
58 | |
59 | sub _new { |
0bfc85b8 |
60 | my $class = shift; |
61 | my $options = @_ == 1 ? $_[0] : {@_}; |
682655a3 |
62 | |
0bfc85b8 |
63 | # NOTE: |
64 | # because of issues with the Perl API |
65 | # to the typeglob in some versions, we |
66 | # need to just always grab a new |
67 | # reference to the hash in the accessor. |
68 | # Ideally we could just store a ref and |
69 | # it would Just Work, but oh well :\ |
70 | $options->{namespace} ||= \undef; |
71 | |
72 | bless $options, $class; |
6d5355c3 |
73 | } |
74 | |
75 | # Attributes |
76 | |
77 | # NOTE: |
78 | # all these attribute readers will be bootstrapped |
79 | # away in the Class::MOP bootstrap section |
80 | |
8683db0e |
81 | sub name { $_[0]->{'package'} } |
56dcfc1a |
82 | sub namespace { |
83 | # NOTE: |
84 | # because of issues with the Perl API |
85 | # to the typeglob in some versions, we |
86 | # need to just always grab a new |
87 | # reference to the hash here. Ideally |
88 | # we could just store a ref and it would |
89 | # Just Work, but oh well :\ |
90 | no strict 'refs'; |
8683db0e |
91 | \%{$_[0]->{'package'} . '::'} |
56dcfc1a |
92 | } |
6d5355c3 |
93 | |
a5e51f0b |
94 | # utility methods |
6d5355c3 |
95 | |
c0cbf4d9 |
96 | { |
97 | my %SIGIL_MAP = ( |
98 | '$' => 'SCALAR', |
99 | '@' => 'ARRAY', |
100 | '%' => 'HASH', |
101 | '&' => 'CODE', |
102 | ); |
6d5355c3 |
103 | |
a5e51f0b |
104 | sub _deconstruct_variable_name { |
105 | my ($self, $variable) = @_; |
106 | |
c0cbf4d9 |
107 | (defined $variable) |
108 | || confess "You must pass a variable name"; |
a5e51f0b |
109 | |
f430cfa4 |
110 | my $sigil = substr($variable, 0, 1, ''); |
a5e51f0b |
111 | |
c0cbf4d9 |
112 | (defined $sigil) |
113 | || confess "The variable name must include a sigil"; |
a5e51f0b |
114 | |
c0cbf4d9 |
115 | (exists $SIGIL_MAP{$sigil}) |
a5e51f0b |
116 | || confess "I do not recognize that sigil '$sigil'"; |
117 | |
f430cfa4 |
118 | return ($variable, $sigil, $SIGIL_MAP{$sigil}); |
c0cbf4d9 |
119 | } |
a5e51f0b |
120 | } |
6d5355c3 |
121 | |
a5e51f0b |
122 | # Class attributes |
6d5355c3 |
123 | |
c46b802b |
124 | # ... these functions have to touch the symbol table itself,.. yuk |
125 | |
a5e51f0b |
126 | sub add_package_symbol { |
127 | my ($self, $variable, $initial_value) = @_; |
6d5355c3 |
128 | |
8b49a472 |
129 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
130 | ? @{$variable}{qw[name sigil type]} |
131 | : $self->_deconstruct_variable_name($variable); |
6d5355c3 |
132 | |
8683db0e |
133 | my $pkg = $self->{'package'}; |
9a8bbfc9 |
134 | |
a5e51f0b |
135 | no strict 'refs'; |
56dcfc1a |
136 | no warnings 'redefine', 'misc'; |
9a8bbfc9 |
137 | *{$pkg . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value; |
c46b802b |
138 | } |
139 | |
140 | sub remove_package_glob { |
141 | my ($self, $name) = @_; |
142 | no strict 'refs'; |
143 | delete ${$self->name . '::'}{$name}; |
a5e51f0b |
144 | } |
6d5355c3 |
145 | |
c46b802b |
146 | # ... these functions deal with stuff on the namespace level |
147 | |
a5e51f0b |
148 | sub has_package_symbol { |
149 | my ($self, $variable) = @_; |
150 | |
8b49a472 |
151 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
152 | ? @{$variable}{qw[name sigil type]} |
153 | : $self->_deconstruct_variable_name($variable); |
56dcfc1a |
154 | |
ae234dc6 |
155 | my $namespace = $self->namespace; |
156 | |
157 | return 0 unless exists $namespace->{$name}; |
d852f4d2 |
158 | |
159 | # FIXME: |
160 | # For some really stupid reason |
161 | # a typeglob will have a default |
162 | # value of \undef in the SCALAR |
163 | # slot, so we need to work around |
164 | # this. Which of course means that |
165 | # if you put \undef in your scalar |
166 | # then this is broken. |
92af7fdf |
167 | |
ae234dc6 |
168 | if (ref($namespace->{$name}) eq 'SCALAR') { |
b3fa93c7 |
169 | return ($type eq 'CODE'); |
92af7fdf |
170 | } |
171 | elsif ($type eq 'SCALAR') { |
ae234dc6 |
172 | my $val = *{$namespace->{$name}}{$type}; |
b3fa93c7 |
173 | return defined(${$val}); |
d852f4d2 |
174 | } |
175 | else { |
b3fa93c7 |
176 | defined(*{$namespace->{$name}}{$type}); |
d852f4d2 |
177 | } |
a5e51f0b |
178 | } |
179 | |
180 | sub get_package_symbol { |
181 | my ($self, $variable) = @_; |
182 | |
8b49a472 |
183 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
184 | ? @{$variable}{qw[name sigil type]} |
185 | : $self->_deconstruct_variable_name($variable); |
a5e51f0b |
186 | |
ae234dc6 |
187 | my $namespace = $self->namespace; |
188 | |
c20522bd |
189 | $self->add_package_symbol($variable) |
ae234dc6 |
190 | unless exists $namespace->{$name}; |
92af7fdf |
191 | |
ae234dc6 |
192 | if (ref($namespace->{$name}) eq 'SCALAR') { |
92af7fdf |
193 | if ($type eq 'CODE') { |
194 | no strict 'refs'; |
195 | return \&{$self->name.'::'.$name}; |
196 | } |
197 | else { |
198 | return undef; |
199 | } |
200 | } |
201 | else { |
ae234dc6 |
202 | return *{$namespace->{$name}}{$type}; |
92af7fdf |
203 | } |
a5e51f0b |
204 | } |
205 | |
206 | sub remove_package_symbol { |
207 | my ($self, $variable) = @_; |
208 | |
8b49a472 |
209 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
210 | ? @{$variable}{qw[name sigil type]} |
211 | : $self->_deconstruct_variable_name($variable); |
a5e51f0b |
212 | |
c46b802b |
213 | # FIXME: |
214 | # no doubt this is grossly inefficient and |
215 | # could be done much easier and faster in XS |
216 | |
8b49a472 |
217 | my ($scalar_desc, $array_desc, $hash_desc, $code_desc) = ( |
218 | { sigil => '$', type => 'SCALAR', name => $name }, |
219 | { sigil => '@', type => 'ARRAY', name => $name }, |
220 | { sigil => '%', type => 'HASH', name => $name }, |
221 | { sigil => '&', type => 'CODE', name => $name }, |
222 | ); |
223 | |
c46b802b |
224 | my ($scalar, $array, $hash, $code); |
a5e51f0b |
225 | if ($type eq 'SCALAR') { |
8b49a472 |
226 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
227 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
228 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
229 | } |
230 | elsif ($type eq 'ARRAY') { |
8b49a472 |
231 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
232 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
233 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
234 | } |
235 | elsif ($type eq 'HASH') { |
8b49a472 |
236 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
237 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
238 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
239 | } |
240 | elsif ($type eq 'CODE') { |
8b49a472 |
241 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
242 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
243 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
a5e51f0b |
244 | } |
245 | else { |
246 | confess "This should never ever ever happen"; |
7f436b8c |
247 | } |
c46b802b |
248 | |
249 | $self->remove_package_glob($name); |
250 | |
8b49a472 |
251 | $self->add_package_symbol($scalar_desc => $scalar) if defined $scalar; |
252 | $self->add_package_symbol($array_desc => $array) if defined $array; |
253 | $self->add_package_symbol($hash_desc => $hash) if defined $hash; |
254 | $self->add_package_symbol($code_desc => $code) if defined $code; |
9d6dce77 |
255 | } |
c0cbf4d9 |
256 | |
9d6dce77 |
257 | sub list_all_package_symbols { |
92330ee2 |
258 | my ($self, $type_filter) = @_; |
a38e4d1a |
259 | |
260 | my $namespace = $self->namespace; |
261 | return keys %{$namespace} unless defined $type_filter; |
262 | |
91e0eb4a |
263 | # NOTE: |
92330ee2 |
264 | # or we can filter based on |
265 | # type (SCALAR|ARRAY|HASH|CODE) |
3609af79 |
266 | if ( $type_filter eq 'CODE' ) { |
267 | return grep { |
92af7fdf |
268 | (ref($namespace->{$_}) |
3609af79 |
269 | ? (ref($namespace->{$_}) eq 'SCALAR') |
270 | : (ref(\$namespace->{$_}) eq 'GLOB' |
271 | && defined(*{$namespace->{$_}}{CODE}))); |
272 | } keys %{$namespace}; |
273 | } else { |
274 | return grep { *{$namespace->{$_}}{$type_filter} } keys %{$namespace}; |
275 | } |
6d5355c3 |
276 | } |
277 | |
0531f510 |
278 | sub get_all_package_symbols { |
279 | my ($self, $type_filter) = @_; |
87b69f58 |
280 | |
281 | die "Cannot call get_all_package_symbols as a class method" |
282 | unless ref $self; |
283 | |
0531f510 |
284 | my $namespace = $self->namespace; |
15273f3c |
285 | |
0531f510 |
286 | return %$namespace unless defined $type_filter; |
287 | |
e5ebdca9 |
288 | # for some reason this nasty impl is orders of magnitude faster than a clean version |
0531f510 |
289 | if ( $type_filter eq 'CODE' ) { |
290 | my $pkg; |
291 | no strict 'refs'; |
292 | return map { |
293 | (ref($namespace->{$_}) |
294 | ? ( $_ => \&{$pkg ||= $self->name . "::$_"} ) |
361c0e55 |
295 | : ( ref \$namespace->{$_} eq 'GLOB' # don't use {CODE} unless it's really a glob to prevent stringification of stubs |
296 | && (*{$namespace->{$_}}{CODE}) # the extra parents prevent breakage on 5.8.2 |
33f5d8ec |
297 | ? ( $_ => *{$namespace->{$_}}{CODE} ) |
b1cd37c2 |
298 | : (do { |
299 | my $sym = B::svref_2object(\$namespace->{$_}); |
300 | my $svt = ref $sym if $sym; |
361c0e55 |
301 | ($sym && ($svt eq 'B::PV' || $svt eq 'B::IV')) |
b1cd37c2 |
302 | ? ($_ => ($pkg ||= $self->name)->can($_)) |
303 | : () }) ) ) |
0531f510 |
304 | } keys %$namespace; |
305 | } else { |
306 | return map { |
307 | $_ => *{$namespace->{$_}}{$type_filter} |
308 | } grep { |
309 | !ref($namespace->{$_}) && *{$namespace->{$_}}{$type_filter} |
310 | } keys %$namespace; |
311 | } |
ae234dc6 |
312 | } |
313 | |
2243a22b |
314 | 1; |
315 | |
316 | __END__ |
317 | |
318 | =pod |
319 | |
320 | =head1 NAME |
321 | |
322 | Class::MOP::Package - Package Meta Object |
323 | |
2243a22b |
324 | =head1 DESCRIPTION |
325 | |
127d39a7 |
326 | This is an abstraction of a Perl 5 package, it is a superclass of |
327 | L<Class::MOP::Class> and provides all of the symbol table |
328 | introspection methods. |
329 | |
2243a22b |
330 | =head1 METHODS |
331 | |
332 | =over 4 |
333 | |
334 | =item B<meta> |
335 | |
127d39a7 |
336 | Returns a metaclass for this package. |
337 | |
b9d9fc0b |
338 | =item B<initialize ($package_name)> |
6d5355c3 |
339 | |
127d39a7 |
340 | This will initialize a Class::MOP::Package instance which represents |
341 | the package of C<$package_name>. |
342 | |
a19fcb5b |
343 | =item B<reinitialize ($package_name, %options)> |
344 | |
345 | This removes the old metaclass, and creates a new one in it's place. |
346 | Do B<not> use this unless you really know what you are doing, it could |
347 | very easily make a very large mess of your program. |
348 | |
6d5355c3 |
349 | =item B<name> |
350 | |
b9d9fc0b |
351 | This is a read-only attribute which returns the package name for the |
352 | given instance. |
353 | |
a5e51f0b |
354 | =item B<namespace> |
355 | |
b9d9fc0b |
356 | This returns a HASH reference to the symbol table. The keys of the |
357 | HASH are the symbol names, and the values are typeglob references. |
358 | |
359 | =item B<add_package_symbol ($variable_name, ?$initial_value)> |
360 | |
361 | Given a C<$variable_name>, which must contain a leading sigil, this |
362 | method will create that variable within the package which houses the |
363 | class. It also takes an optional C<$initial_value>, which must be a |
364 | reference of the same type as the sigil of the C<$variable_name> |
365 | implies. |
366 | |
367 | =item B<get_package_symbol ($variable_name)> |
6d5355c3 |
368 | |
b9d9fc0b |
369 | This will return a reference to the package variable in |
370 | C<$variable_name>. |
6d5355c3 |
371 | |
b9d9fc0b |
372 | =item B<has_package_symbol ($variable_name)> |
6d5355c3 |
373 | |
b9d9fc0b |
374 | Returns true (C<1>) if there is a package variable defined for |
375 | C<$variable_name>, and false (C<0>) otherwise. |
6d5355c3 |
376 | |
b9d9fc0b |
377 | =item B<remove_package_symbol ($variable_name)> |
378 | |
379 | This will attempt to remove the package variable at C<$variable_name>. |
380 | |
381 | =item B<remove_package_glob ($glob_name)> |
382 | |
383 | This will attempt to remove the entire typeglob associated with |
384 | C<$glob_name> from the package. |
c46b802b |
385 | |
92330ee2 |
386 | =item B<list_all_package_symbols (?$type_filter)> |
9d6dce77 |
387 | |
b9d9fc0b |
388 | This will list all the glob names associated with the current package. |
389 | By inspecting the globs returned you can discern all the variables in |
390 | the package. |
391 | |
92330ee2 |
392 | By passing a C<$type_filter>, you can limit the list to only those |
393 | which match the filter (either SCALAR, ARRAY, HASH or CODE). |
394 | |
ae234dc6 |
395 | =item B<get_all_package_symbols (?$type_filter)> |
396 | |
397 | Works exactly like C<list_all_package_symbols> but returns a HASH of |
398 | name => thing mapping instead of just an ARRAY of names. |
399 | |
2243a22b |
400 | =back |
401 | |
1a09d9cc |
402 | =head1 AUTHORS |
2243a22b |
403 | |
404 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
405 | |
406 | =head1 COPYRIGHT AND LICENSE |
407 | |
69e3ab0a |
408 | Copyright 2006-2008 by Infinity Interactive, Inc. |
2243a22b |
409 | |
410 | L<http://www.iinteractive.com> |
411 | |
412 | This library is free software; you can redistribute it and/or modify |
413 | it under the same terms as Perl itself. |
414 | |
92af7fdf |
415 | =cut |