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2243a22b |
1 | |
2 | package Class::MOP::Package; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
7 | use Scalar::Util 'blessed'; |
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8 | use Carp 'confess'; |
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9 | |
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10 | our $VERSION = '0.65'; |
f0480c45 |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
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12 | |
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13 | use base 'Class::MOP::Object'; |
14 | |
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15 | # creation ... |
16 | |
17 | sub initialize { |
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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 { |
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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 :\ |
8683db0e |
32 | 'namespace' => \undef, |
a5e51f0b |
33 | } => $class; |
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34 | } |
35 | |
36 | # Attributes |
37 | |
38 | # NOTE: |
39 | # all these attribute readers will be bootstrapped |
40 | # away in the Class::MOP bootstrap section |
41 | |
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42 | sub name { $_[0]->{'package'} } |
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43 | sub namespace { |
44 | # NOTE: |
45 | # because of issues with the Perl API |
46 | # to the typeglob in some versions, we |
47 | # need to just always grab a new |
48 | # reference to the hash here. Ideally |
49 | # we could just store a ref and it would |
50 | # Just Work, but oh well :\ |
51 | no strict 'refs'; |
8683db0e |
52 | \%{$_[0]->{'package'} . '::'} |
56dcfc1a |
53 | } |
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54 | |
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55 | # utility methods |
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56 | |
c0cbf4d9 |
57 | { |
58 | my %SIGIL_MAP = ( |
59 | '$' => 'SCALAR', |
60 | '@' => 'ARRAY', |
61 | '%' => 'HASH', |
62 | '&' => 'CODE', |
63 | ); |
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64 | |
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65 | sub _deconstruct_variable_name { |
66 | my ($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 | } |
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82 | |
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83 | # Class attributes |
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84 | |
c46b802b |
85 | # ... these functions have to touch the symbol table itself,.. yuk |
86 | |
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87 | sub add_package_symbol { |
88 | my ($self, $variable, $initial_value) = @_; |
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89 | |
8b49a472 |
90 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
91 | ? @{$variable}{qw[name sigil type]} |
92 | : $self->_deconstruct_variable_name($variable); |
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93 | |
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94 | my $pkg = $self->{'package'}; |
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95 | |
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96 | no strict 'refs'; |
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97 | no warnings 'redefine', 'misc'; |
9a8bbfc9 |
98 | *{$pkg . '::' . $name} = ref $initial_value ? $initial_value : \$initial_value; |
c46b802b |
99 | } |
100 | |
101 | sub remove_package_glob { |
102 | my ($self, $name) = @_; |
103 | no strict 'refs'; |
104 | delete ${$self->name . '::'}{$name}; |
a5e51f0b |
105 | } |
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106 | |
c46b802b |
107 | # ... these functions deal with stuff on the namespace level |
108 | |
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109 | sub has_package_symbol { |
110 | my ($self, $variable) = @_; |
111 | |
8b49a472 |
112 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
113 | ? @{$variable}{qw[name sigil type]} |
114 | : $self->_deconstruct_variable_name($variable); |
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115 | |
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116 | my $namespace = $self->namespace; |
117 | |
118 | return 0 unless exists $namespace->{$name}; |
d852f4d2 |
119 | |
120 | # FIXME: |
121 | # For some really stupid reason |
122 | # a typeglob will have a default |
123 | # value of \undef in the SCALAR |
124 | # slot, so we need to work around |
125 | # this. Which of course means that |
126 | # if you put \undef in your scalar |
127 | # then this is broken. |
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128 | |
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129 | if (ref($namespace->{$name}) eq 'SCALAR') { |
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130 | return ($type eq 'CODE' ? 1 : 0); |
131 | } |
132 | elsif ($type eq 'SCALAR') { |
ae234dc6 |
133 | my $val = *{$namespace->{$name}}{$type}; |
92af7fdf |
134 | return defined(${$val}) ? 1 : 0; |
d852f4d2 |
135 | } |
136 | else { |
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137 | defined(*{$namespace->{$name}}{$type}) ? 1 : 0; |
d852f4d2 |
138 | } |
a5e51f0b |
139 | } |
140 | |
141 | sub get_package_symbol { |
142 | my ($self, $variable) = @_; |
143 | |
8b49a472 |
144 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
145 | ? @{$variable}{qw[name sigil type]} |
146 | : $self->_deconstruct_variable_name($variable); |
a5e51f0b |
147 | |
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148 | my $namespace = $self->namespace; |
149 | |
c20522bd |
150 | $self->add_package_symbol($variable) |
ae234dc6 |
151 | unless exists $namespace->{$name}; |
92af7fdf |
152 | |
ae234dc6 |
153 | if (ref($namespace->{$name}) eq 'SCALAR') { |
92af7fdf |
154 | if ($type eq 'CODE') { |
155 | no strict 'refs'; |
156 | return \&{$self->name.'::'.$name}; |
157 | } |
158 | else { |
159 | return undef; |
160 | } |
161 | } |
162 | else { |
ae234dc6 |
163 | return *{$namespace->{$name}}{$type}; |
92af7fdf |
164 | } |
a5e51f0b |
165 | } |
166 | |
167 | sub remove_package_symbol { |
168 | my ($self, $variable) = @_; |
169 | |
8b49a472 |
170 | my ($name, $sigil, $type) = ref $variable eq 'HASH' |
171 | ? @{$variable}{qw[name sigil type]} |
172 | : $self->_deconstruct_variable_name($variable); |
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173 | |
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174 | # FIXME: |
175 | # no doubt this is grossly inefficient and |
176 | # could be done much easier and faster in XS |
177 | |
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178 | my ($scalar_desc, $array_desc, $hash_desc, $code_desc) = ( |
179 | { sigil => '$', type => 'SCALAR', name => $name }, |
180 | { sigil => '@', type => 'ARRAY', name => $name }, |
181 | { sigil => '%', type => 'HASH', name => $name }, |
182 | { sigil => '&', type => 'CODE', name => $name }, |
183 | ); |
184 | |
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185 | my ($scalar, $array, $hash, $code); |
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186 | if ($type eq 'SCALAR') { |
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187 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
188 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
189 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
190 | } |
191 | elsif ($type eq 'ARRAY') { |
8b49a472 |
192 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
193 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
194 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
195 | } |
196 | elsif ($type eq 'HASH') { |
8b49a472 |
197 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
198 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
199 | $code = $self->get_package_symbol($code_desc) if $self->has_package_symbol($code_desc); |
a5e51f0b |
200 | } |
201 | elsif ($type eq 'CODE') { |
8b49a472 |
202 | $scalar = $self->get_package_symbol($scalar_desc) if $self->has_package_symbol($scalar_desc); |
203 | $array = $self->get_package_symbol($array_desc) if $self->has_package_symbol($array_desc); |
204 | $hash = $self->get_package_symbol($hash_desc) if $self->has_package_symbol($hash_desc); |
a5e51f0b |
205 | } |
206 | else { |
207 | confess "This should never ever ever happen"; |
7f436b8c |
208 | } |
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209 | |
210 | $self->remove_package_glob($name); |
211 | |
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212 | $self->add_package_symbol($scalar_desc => $scalar) if defined $scalar; |
213 | $self->add_package_symbol($array_desc => $array) if defined $array; |
214 | $self->add_package_symbol($hash_desc => $hash) if defined $hash; |
215 | $self->add_package_symbol($code_desc => $code) if defined $code; |
9d6dce77 |
216 | } |
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217 | |
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218 | sub list_all_package_symbols { |
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219 | my ($self, $type_filter) = @_; |
a38e4d1a |
220 | |
221 | my $namespace = $self->namespace; |
222 | return keys %{$namespace} unless defined $type_filter; |
223 | |
91e0eb4a |
224 | # NOTE: |
92330ee2 |
225 | # or we can filter based on |
226 | # type (SCALAR|ARRAY|HASH|CODE) |
91e0eb4a |
227 | return grep { |
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228 | (ref($namespace->{$_}) |
229 | ? (ref($namespace->{$_}) eq 'SCALAR' && $type_filter eq 'CODE') |
230 | : (ref(\$namespace->{$_}) eq 'GLOB' |
231 | && defined(*{$namespace->{$_}}{$type_filter}))); |
91e0eb4a |
232 | } keys %{$namespace}; |
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233 | } |
234 | |
ae234dc6 |
235 | sub get_all_package_symbols { |
236 | my ($self, $type_filter) = @_; |
a38e4d1a |
237 | my $namespace = $self->namespace; |
b16217dd |
238 | return %$namespace unless defined $type_filter; |
239 | |
240 | my @ret; |
241 | |
242 | if ( $type_filter eq 'CODE' ) { |
243 | my $pkg = $self->name; |
244 | foreach my $key ( keys %$namespace ) { |
245 | my $value = $namespace->{$key}; |
246 | if ( ref $value ) { |
247 | no strict 'refs'; |
248 | push @ret, $key => \&{"${pkg}::$key"}; |
249 | } elsif ( ref(\$value) eq 'GLOB' ) { |
250 | if ( my $ref = *{$value}{CODE} ) { |
251 | push @ret, $key, $ref; |
252 | } |
253 | } |
254 | } |
255 | } else { |
256 | foreach my $key ( keys %$namespace ) { |
257 | my $value = $namespace->{$key}; |
258 | if ( ref(\$value) eq 'GLOB' ) { |
259 | if ( my $ref = *{$value}{$type_filter} ) { |
260 | push @ret, $key => $ref; |
261 | } |
262 | } |
263 | } |
264 | } |
265 | |
266 | return @ret; |
ae234dc6 |
267 | } |
268 | |
2243a22b |
269 | 1; |
270 | |
271 | __END__ |
272 | |
273 | =pod |
274 | |
275 | =head1 NAME |
276 | |
277 | Class::MOP::Package - Package Meta Object |
278 | |
2243a22b |
279 | =head1 DESCRIPTION |
280 | |
127d39a7 |
281 | This is an abstraction of a Perl 5 package, it is a superclass of |
282 | L<Class::MOP::Class> and provides all of the symbol table |
283 | introspection methods. |
284 | |
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285 | =head1 METHODS |
286 | |
287 | =over 4 |
288 | |
289 | =item B<meta> |
290 | |
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291 | Returns a metaclass for this package. |
292 | |
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293 | =item B<initialize ($package_name)> |
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294 | |
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295 | This will initialize a Class::MOP::Package instance which represents |
296 | the package of C<$package_name>. |
297 | |
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298 | =item B<name> |
299 | |
b9d9fc0b |
300 | This is a read-only attribute which returns the package name for the |
301 | given instance. |
302 | |
a5e51f0b |
303 | =item B<namespace> |
304 | |
b9d9fc0b |
305 | This returns a HASH reference to the symbol table. The keys of the |
306 | HASH are the symbol names, and the values are typeglob references. |
307 | |
308 | =item B<add_package_symbol ($variable_name, ?$initial_value)> |
309 | |
310 | Given a C<$variable_name>, which must contain a leading sigil, this |
311 | method will create that variable within the package which houses the |
312 | class. It also takes an optional C<$initial_value>, which must be a |
313 | reference of the same type as the sigil of the C<$variable_name> |
314 | implies. |
315 | |
316 | =item B<get_package_symbol ($variable_name)> |
6d5355c3 |
317 | |
b9d9fc0b |
318 | This will return a reference to the package variable in |
319 | C<$variable_name>. |
6d5355c3 |
320 | |
b9d9fc0b |
321 | =item B<has_package_symbol ($variable_name)> |
6d5355c3 |
322 | |
b9d9fc0b |
323 | Returns true (C<1>) if there is a package variable defined for |
324 | C<$variable_name>, and false (C<0>) otherwise. |
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325 | |
b9d9fc0b |
326 | =item B<remove_package_symbol ($variable_name)> |
327 | |
328 | This will attempt to remove the package variable at C<$variable_name>. |
329 | |
330 | =item B<remove_package_glob ($glob_name)> |
331 | |
332 | This will attempt to remove the entire typeglob associated with |
333 | C<$glob_name> from the package. |
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334 | |
92330ee2 |
335 | =item B<list_all_package_symbols (?$type_filter)> |
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336 | |
b9d9fc0b |
337 | This will list all the glob names associated with the current package. |
338 | By inspecting the globs returned you can discern all the variables in |
339 | the package. |
340 | |
92330ee2 |
341 | By passing a C<$type_filter>, you can limit the list to only those |
342 | which match the filter (either SCALAR, ARRAY, HASH or CODE). |
343 | |
ae234dc6 |
344 | =item B<get_all_package_symbols (?$type_filter)> |
345 | |
346 | Works exactly like C<list_all_package_symbols> but returns a HASH of |
347 | name => thing mapping instead of just an ARRAY of names. |
348 | |
2243a22b |
349 | =back |
350 | |
1a09d9cc |
351 | =head1 AUTHORS |
2243a22b |
352 | |
353 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
354 | |
355 | =head1 COPYRIGHT AND LICENSE |
356 | |
69e3ab0a |
357 | Copyright 2006-2008 by Infinity Interactive, Inc. |
2243a22b |
358 | |
359 | L<http://www.iinteractive.com> |
360 | |
361 | This library is free software; you can redistribute it and/or modify |
362 | it under the same terms as Perl itself. |
363 | |
92af7fdf |
364 | =cut |