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1 | |
2 | package Class::MOP::Package; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
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7 | use Scalar::Util 'blessed', 'reftype', 'weaken'; |
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8 | use Carp 'confess'; |
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9 | use Devel::GlobalDestruction 'in_global_destruction'; |
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10 | use Package::Stash; |
11 | |
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12 | use base 'Class::MOP::Object'; |
13 | |
14 | # creation ... |
15 | |
16 | sub initialize { |
17 | my ( $class, @args ) = @_; |
18 | |
19 | unshift @args, "package" if @args % 2; |
20 | |
21 | my %options = @args; |
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22 | my $package_name = delete $options{package}; |
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23 | |
24 | |
25 | # we hand-construct the class |
26 | # until we can bootstrap it |
27 | if ( my $meta = Class::MOP::get_metaclass_by_name($package_name) ) { |
28 | return $meta; |
29 | } else { |
30 | my $meta = ( ref $class || $class )->_new({ |
31 | 'package' => $package_name, |
32 | %options, |
33 | }); |
34 | Class::MOP::store_metaclass_by_name($package_name, $meta); |
35 | |
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36 | Class::MOP::weaken_metaclass($package_name) if $options{weaken}; |
37 | |
38 | |
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39 | return $meta; |
40 | } |
41 | } |
42 | |
43 | sub reinitialize { |
44 | my ( $class, @args ) = @_; |
45 | |
46 | unshift @args, "package" if @args % 2; |
47 | |
48 | my %options = @args; |
49 | my $package_name = delete $options{package}; |
50 | |
51 | (defined $package_name && $package_name |
52 | && (!blessed $package_name || $package_name->isa('Class::MOP::Package'))) |
53 | || confess "You must pass a package name or an existing Class::MOP::Package instance"; |
54 | |
55 | $package_name = $package_name->name |
56 | if blessed $package_name; |
57 | |
58 | Class::MOP::remove_metaclass_by_name($package_name); |
59 | |
60 | $class->initialize($package_name, %options); # call with first arg form for compat |
61 | } |
62 | |
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63 | sub create { |
64 | my $class = shift; |
65 | my @args = @_; |
66 | |
67 | return $class->initialize(@args); |
68 | } |
69 | |
70 | ## ANON packages |
71 | |
72 | { |
73 | # NOTE: |
74 | # this should be sufficient, if you have a |
75 | # use case where it is not, write a test and |
76 | # I will change it. |
77 | my $ANON_SERIAL = 0; |
78 | |
79 | my %ANON_PACKAGE_CACHE; |
80 | |
81 | # NOTE: |
82 | # we need a sufficiently annoying prefix |
83 | # this should suffice for now, this is |
84 | # used in a couple of places below, so |
85 | # need to put it up here for now. |
86 | sub _anon_package_prefix { 'Class::MOP::Package::__ANON__::SERIAL::' } |
87 | |
88 | sub is_anon { |
89 | my $self = shift; |
90 | no warnings 'uninitialized'; |
91 | my $prefix = $self->_anon_package_prefix; |
92 | $self->name =~ /^$prefix/; |
93 | } |
94 | |
95 | sub create_anon { |
96 | my ($class, %options) = @_; |
97 | |
98 | my $cache_ok = delete $options{cache}; |
99 | |
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100 | my $cache_key; |
101 | if ($cache_ok) { |
102 | $cache_key = $class->_anon_cache_key(%options); |
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103 | |
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104 | if (defined $ANON_PACKAGE_CACHE{$cache_key}) { |
105 | return $ANON_PACKAGE_CACHE{$cache_key}; |
106 | } |
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107 | } |
108 | |
109 | $options{weaken} = !$cache_ok unless exists $options{weaken}; |
110 | |
111 | my $package_name = $class->_anon_package_prefix . ++$ANON_SERIAL; |
112 | |
113 | my $meta = $class->create($package_name, %options); |
114 | |
115 | if ($cache_ok) { |
116 | $ANON_PACKAGE_CACHE{$cache_key} = $meta; |
117 | weaken($ANON_PACKAGE_CACHE{$cache_key}); |
118 | } |
119 | |
120 | return $meta; |
121 | } |
122 | |
123 | sub _anon_cache_key { confess "Packages are not cacheable" } |
124 | |
125 | sub DESTROY { |
126 | my $self = shift; |
127 | |
128 | return if in_global_destruction(); # it'll happen soon anyway and this just makes things more complicated |
129 | |
130 | $self->_free_anon |
131 | if $self->is_anon; |
132 | } |
133 | |
134 | sub _free_anon { |
135 | my $self = shift; |
136 | my $name = $self->name; |
137 | |
138 | # Moose does a weird thing where it replaces the metaclass for |
139 | # class when fixing metaclass incompatibility. In that case, |
140 | # we don't want to clean out the namespace now. We can detect |
141 | # that because Moose will explicitly update the singleton |
142 | # cache in Class::MOP. |
143 | no warnings 'uninitialized'; |
144 | my $current_meta = Class::MOP::get_metaclass_by_name($name); |
145 | return if $current_meta ne $self; |
146 | |
147 | my ($first_fragments, $last_fragment) = ($name =~ /^(.*)::(.*)$/); |
148 | |
149 | no strict 'refs'; |
150 | @{$name . '::ISA'} = (); |
151 | %{$name . '::'} = (); |
152 | delete ${$first_fragments . '::'}{$last_fragment . '::'}; |
153 | |
154 | Class::MOP::remove_metaclass_by_name($name); |
155 | } |
156 | |
157 | } |
158 | |
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159 | sub _new { |
160 | my $class = shift; |
161 | |
162 | return Class::MOP::Class->initialize($class)->new_object(@_) |
163 | if $class ne __PACKAGE__; |
164 | |
165 | my $params = @_ == 1 ? $_[0] : {@_}; |
166 | |
167 | return bless { |
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168 | # Need to quote package to avoid a problem with PPI mis-parsing this |
169 | # as a package statement. |
170 | 'package' => $params->{package}, |
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171 | |
172 | # NOTE: |
173 | # because of issues with the Perl API |
174 | # to the typeglob in some versions, we |
175 | # need to just always grab a new |
176 | # reference to the hash in the accessor. |
177 | # Ideally we could just store a ref and |
178 | # it would Just Work, but oh well :\ |
179 | |
180 | namespace => \undef, |
181 | |
182 | } => $class; |
183 | } |
184 | |
185 | # Attributes |
186 | |
187 | # NOTE: |
188 | # all these attribute readers will be bootstrapped |
189 | # away in the Class::MOP bootstrap section |
190 | |
191 | sub _package_stash { |
192 | $_[0]->{_package_stash} ||= Package::Stash->new($_[0]->name) |
193 | } |
194 | sub namespace { |
195 | $_[0]->_package_stash->namespace |
196 | } |
197 | |
198 | # Class attributes |
199 | |
200 | # ... these functions have to touch the symbol table itself,.. yuk |
201 | |
202 | sub add_package_symbol { |
203 | my $self = shift; |
204 | $self->_package_stash->add_symbol(@_); |
205 | } |
206 | |
207 | sub remove_package_glob { |
208 | my $self = shift; |
209 | $self->_package_stash->remove_glob(@_); |
210 | } |
211 | |
212 | # ... these functions deal with stuff on the namespace level |
213 | |
214 | sub has_package_symbol { |
215 | my $self = shift; |
216 | $self->_package_stash->has_symbol(@_); |
217 | } |
218 | |
219 | sub get_package_symbol { |
220 | my $self = shift; |
221 | $self->_package_stash->get_symbol(@_); |
222 | } |
223 | |
224 | sub get_or_add_package_symbol { |
225 | my $self = shift; |
226 | $self->_package_stash->get_or_add_symbol(@_); |
227 | } |
228 | |
229 | sub remove_package_symbol { |
230 | my $self = shift; |
231 | $self->_package_stash->remove_symbol(@_); |
232 | } |
233 | |
234 | sub list_all_package_symbols { |
235 | my $self = shift; |
236 | $self->_package_stash->list_all_symbols(@_); |
237 | } |
238 | |
239 | sub get_all_package_symbols { |
240 | my $self = shift; |
241 | $self->_package_stash->get_all_symbols(@_); |
242 | } |
243 | |
244 | 1; |
245 | |
246 | # ABSTRACT: Package Meta Object |
247 | |
248 | __END__ |
249 | |
250 | =pod |
251 | |
252 | =head1 DESCRIPTION |
253 | |
254 | The Package Protocol provides an abstraction of a Perl 5 package. A |
255 | package is basically namespace, and this module provides methods for |
256 | looking at and changing that namespace's symbol table. |
257 | |
258 | =head1 METHODS |
259 | |
260 | =over 4 |
261 | |
262 | =item B<< Class::MOP::Package->initialize($package_name) >> |
263 | |
264 | This method creates a new C<Class::MOP::Package> instance which |
265 | represents specified package. If an existing metaclass object exists |
266 | for the package, that will be returned instead. |
267 | |
268 | =item B<< Class::MOP::Package->reinitialize($package) >> |
269 | |
270 | This method forcibly removes any existing metaclass for the package |
271 | before calling C<initialize>. In contrast to C<initialize>, you may |
272 | also pass an existing C<Class::MOP::Package> instance instead of just |
273 | a package name as C<$package>. |
274 | |
275 | Do not call this unless you know what you are doing. |
276 | |
277 | =item B<< $metapackage->name >> |
278 | |
279 | This is returns the package's name, as passed to the constructor. |
280 | |
281 | =item B<< $metapackage->namespace >> |
282 | |
283 | This returns a hash reference to the package's symbol table. The keys |
284 | are symbol names and the values are typeglob references. |
285 | |
286 | =item B<< $metapackage->add_package_symbol($variable_name, $initial_value) >> |
287 | |
288 | This method accepts a variable name and an optional initial value. The |
289 | C<$variable_name> must contain a leading sigil. |
290 | |
291 | This method creates the variable in the package's symbol table, and |
292 | sets it to the initial value if one was provided. |
293 | |
294 | =item B<< $metapackage->get_package_symbol($variable_name) >> |
295 | |
296 | Given a variable name, this method returns the variable as a reference |
297 | or undef if it does not exist. The C<$variable_name> must contain a |
298 | leading sigil. |
299 | |
300 | =item B<< $metapackage->get_or_add_package_symbol($variable_name) >> |
301 | |
302 | Given a variable name, this method returns the variable as a reference. |
303 | If it does not exist, a default value will be generated if possible. The |
304 | C<$variable_name> must contain a leading sigil. |
305 | |
306 | =item B<< $metapackage->has_package_symbol($variable_name) >> |
307 | |
308 | Returns true if there is a package variable defined for |
309 | C<$variable_name>. The C<$variable_name> must contain a leading sigil. |
310 | |
311 | =item B<< $metapackage->remove_package_symbol($variable_name) >> |
312 | |
313 | This will remove the package variable specified C<$variable_name>. The |
314 | C<$variable_name> must contain a leading sigil. |
315 | |
316 | =item B<< $metapackage->remove_package_glob($glob_name) >> |
317 | |
318 | Given the name of a glob, this will remove that glob from the |
319 | package's symbol table. Glob names do not include a sigil. Removing |
320 | the glob removes all variables and subroutines with the specified |
321 | name. |
322 | |
323 | =item B<< $metapackage->list_all_package_symbols($type_filter) >> |
324 | |
325 | This will list all the glob names associated with the current |
326 | package. These names do not have leading sigils. |
327 | |
328 | You can provide an optional type filter, which should be one of |
329 | 'SCALAR', 'ARRAY', 'HASH', or 'CODE'. |
330 | |
331 | =item B<< $metapackage->get_all_package_symbols($type_filter) >> |
332 | |
333 | This works much like C<list_all_package_symbols>, but it returns a |
334 | hash reference. The keys are glob names and the values are references |
335 | to the value for that name. |
336 | |
337 | =item B<< Class::MOP::Package->meta >> |
338 | |
339 | This will return a L<Class::MOP::Class> instance for this class. |
340 | |
341 | =back |
342 | |
343 | =cut |