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4093c859 |
1 | package Mouse::Util; |
2 | use strict; |
3 | use warnings; |
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4 | |
5 | use Exporter; |
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6 | |
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7 | use Carp qw(confess); |
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8 | use B (); |
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9 | |
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10 | use constant _MOUSE_VERBOSE => !!$ENV{MOUSE_VERBOSE}; |
11 | |
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12 | our @ISA = qw(Exporter); |
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13 | our @EXPORT_OK = qw( |
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14 | find_meta |
15 | does_role |
16 | resolve_metaclass_alias |
ea249879 |
17 | apply_all_roles |
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18 | english_list |
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19 | |
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20 | load_class |
21 | is_class_loaded |
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22 | |
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23 | get_linear_isa |
24 | get_code_info |
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25 | |
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26 | get_code_package |
27 | |
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28 | not_supported |
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29 | |
30 | does meta dump |
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31 | _MOUSE_VERBOSE |
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32 | ); |
33 | our %EXPORT_TAGS = ( |
34 | all => \@EXPORT_OK, |
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35 | meta => [qw(does meta dump _MOUSE_VERBOSE)], |
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36 | ); |
37 | |
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38 | # aliases as public APIs |
39 | |
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40 | # it must be 'require', not 'use', because Mouse::Meta::Module depends on Mouse::Util |
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41 | require Mouse::Meta::Module; # for the entities of metaclass cache utilities |
42 | |
43 | BEGIN { |
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44 | *class_of = \&Mouse::Meta::Module::class_of; |
45 | *get_metaclass_by_name = \&Mouse::Meta::Module::get_metaclass_by_name; |
46 | *get_all_metaclass_instances = \&Mouse::Meta::Module::get_all_metaclass_instances; |
47 | *get_all_metaclass_names = \&Mouse::Meta::Module::get_all_metaclass_names; |
48 | } |
49 | |
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50 | # Moose::Util compatible utilities |
51 | |
52 | sub find_meta{ |
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53 | return class_of( $_[0] ); |
08f7a8db |
54 | } |
55 | |
56 | sub does_role{ |
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57 | my ($class_or_obj, $role_name) = @_; |
8e64d0fa |
58 | |
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59 | my $meta = class_of($class_or_obj); |
8e64d0fa |
60 | |
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61 | (defined $role_name) |
62 | || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()"); |
63 | |
64 | return defined($meta) && $meta->does_role($role_name); |
08f7a8db |
65 | } |
66 | |
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67 | BEGIN { |
272a1930 |
68 | my $impl; |
bcd39bf4 |
69 | if ($] >= 5.009_005) { |
388b8ebd |
70 | require mro; |
272a1930 |
71 | $impl = \&mro::get_linear_isa; |
72 | } else { |
e0396a57 |
73 | my $e = do { |
74 | local $@; |
75 | eval { require MRO::Compat }; |
76 | $@; |
f172d4e7 |
77 | }; |
e0396a57 |
78 | if (!$e) { |
272a1930 |
79 | $impl = \&mro::get_linear_isa; |
80 | } else { |
81 | # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV |
e0396a57 |
82 | my $_get_linear_isa_dfs; # this recurses so it isn't pretty |
83 | $_get_linear_isa_dfs = sub { |
272a1930 |
84 | no strict 'refs'; |
85 | |
86 | my $classname = shift; |
87 | |
88 | my @lin = ($classname); |
89 | my %stored; |
90 | foreach my $parent (@{"$classname\::ISA"}) { |
e0396a57 |
91 | my $plin = $_get_linear_isa_dfs->($parent); |
92 | foreach my $p(@$plin) { |
93 | next if exists $stored{$p}; |
94 | push(@lin, $p); |
95 | $stored{$p} = 1; |
272a1930 |
96 | } |
97 | } |
98 | return \@lin; |
99 | }; |
100 | # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ |
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101 | $impl = $_get_linear_isa_dfs; |
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102 | } |
103 | } |
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104 | |
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105 | |
106 | no warnings 'once'; |
107 | *get_linear_isa = $impl; |
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108 | } |
109 | |
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110 | { # taken from Sub::Identify |
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111 | sub get_code_info($) { |
112 | my ($coderef) = @_; |
113 | ref($coderef) or return; |
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114 | |
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115 | my $cv = B::svref_2object($coderef); |
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116 | $cv->isa('B::CV') or return; |
117 | |
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118 | my $gv = $cv->GV; |
119 | $gv->isa('B::GV') or return; |
120 | |
121 | return ($gv->STASH->NAME, $gv->NAME); |
122 | } |
01afd8ff |
123 | |
124 | sub get_code_package{ |
125 | my($coderef) = @_; |
126 | |
127 | my $cv = B::svref_2object($coderef); |
128 | $cv->isa('B::CV') or return ''; |
129 | |
130 | my $gv = $cv->GV; |
131 | $gv->isa('B::GV') or return ''; |
132 | |
133 | return $gv->STASH->NAME; |
134 | } |
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135 | } |
136 | |
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137 | # taken from Mouse::Util (0.90) |
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138 | { |
139 | my %cache; |
140 | |
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141 | sub resolve_metaclass_alias { |
142 | my ( $type, $metaclass_name, %options ) = @_; |
143 | |
144 | my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); |
145 | |
146 | return $cache{$cache_key}{$metaclass_name} ||= do{ |
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147 | |
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148 | my $possible_full_name = join '::', |
149 | 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name |
150 | ; |
151 | |
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152 | my $loaded_class = load_first_existing_class( |
153 | $possible_full_name, |
154 | $metaclass_name |
155 | ); |
156 | |
157 | $loaded_class->can('register_implementation') |
158 | ? $loaded_class->register_implementation |
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159 | : $loaded_class; |
8e64d0fa |
160 | }; |
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161 | } |
162 | } |
163 | |
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164 | # Utilities from Class::MOP |
165 | |
166 | |
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167 | # taken from Class/MOP.pm |
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168 | sub is_valid_class_name { |
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169 | my $class = shift; |
170 | |
171 | return 0 if ref($class); |
172 | return 0 unless defined($class); |
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173 | |
174 | return 1 if $class =~ /^\w+(?:::\w+)*$/; |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | # taken from Class/MOP.pm |
180 | sub load_first_existing_class { |
181 | my @classes = @_ |
182 | or return; |
183 | |
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184 | my %exceptions; |
185 | for my $class (@classes) { |
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186 | my $e = _try_load_one_class($class); |
187 | |
188 | if ($e) { |
189 | $exceptions{$class} = $e; |
190 | } |
191 | else { |
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192 | return $class; |
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193 | } |
194 | } |
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195 | |
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196 | # not found |
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197 | confess join( |
198 | "\n", |
199 | map { |
200 | sprintf( "Could not load class (%s) because : %s", |
201 | $_, $exceptions{$_} ) |
202 | } @classes |
203 | ); |
204 | } |
205 | |
206 | # taken from Class/MOP.pm |
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207 | my %is_class_loaded_cache; |
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208 | sub _try_load_one_class { |
209 | my $class = shift; |
210 | |
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211 | unless ( is_valid_class_name($class) ) { |
212 | my $display = defined($class) ? $class : 'undef'; |
213 | confess "Invalid class name ($display)"; |
214 | } |
215 | |
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216 | return undef if $is_class_loaded_cache{$class} ||= is_class_loaded($class); |
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217 | |
218 | my $file = $class . '.pm'; |
219 | $file =~ s{::}{/}g; |
220 | |
221 | return do { |
222 | local $@; |
223 | eval { require($file) }; |
224 | $@; |
225 | }; |
226 | } |
227 | |
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228 | |
229 | sub load_class { |
230 | my $class = shift; |
231 | my $e = _try_load_one_class($class); |
232 | confess "Could not load class ($class) because : $e" if $e; |
233 | |
234 | return 1; |
235 | } |
236 | |
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237 | |
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238 | sub is_class_loaded { |
239 | my $class = shift; |
240 | |
241 | return 0 if ref($class) || !defined($class) || !length($class); |
242 | |
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243 | # walk the symbol table tree to avoid autovififying |
244 | # \*{${main::}{"Foo::"}} == \*main::Foo:: |
245 | |
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246 | my $pack = \%::; |
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247 | foreach my $part (split('::', $class)) { |
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248 | my $entry = \$pack->{$part . '::'}; |
249 | return 0 if ref($entry) ne 'GLOB'; |
250 | $pack = *{$entry}{HASH} or return 0; |
6cfa1e5e |
251 | } |
252 | |
253 | # check for $VERSION or @ISA |
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254 | return 1 if exists $pack->{VERSION} |
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255 | && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; |
3aac966d |
256 | return 1 if exists $pack->{ISA} |
ff687069 |
257 | && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; |
6cfa1e5e |
258 | |
259 | # check for any method |
ff687069 |
260 | foreach my $name( keys %{$pack} ) { |
261 | my $entry = \$pack->{$name}; |
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262 | return 1 if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; |
6cfa1e5e |
263 | } |
264 | |
265 | # fail |
266 | return 0; |
267 | } |
268 | |
269 | |
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270 | sub apply_all_roles { |
271 | my $meta = Mouse::Meta::Class->initialize(shift); |
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272 | |
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273 | my @roles; |
f6715552 |
274 | |
275 | # Basis of Data::OptList |
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276 | my $max = scalar(@_); |
277 | for (my $i = 0; $i < $max ; $i++) { |
278 | if ($i + 1 < $max && ref($_[$i + 1])) { |
279 | push @roles, [ $_[$i++] => $_[$i] ]; |
280 | } else { |
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281 | push @roles, [ $_[$i] => undef ]; |
21498b08 |
282 | } |
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283 | my $role_name = $roles[-1][0]; |
284 | load_class($role_name); |
285 | ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') ) |
286 | || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); |
21498b08 |
287 | } |
288 | |
21498b08 |
289 | if ( scalar @roles == 1 ) { |
290 | my ( $role, $params ) = @{ $roles[0] }; |
291 | $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); |
292 | } |
293 | else { |
294 | Mouse::Meta::Role->combine_apply($meta, @roles); |
295 | } |
23264b5b |
296 | return; |
2e92bb89 |
297 | } |
298 | |
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299 | # taken from Moose::Util 0.90 |
300 | sub english_list { |
8e64d0fa |
301 | return $_[0] if @_ == 1; |
302 | |
303 | my @items = sort @_; |
304 | |
305 | return "$items[0] and $items[1]" if @items == 2; |
306 | |
307 | my $tail = pop @items; |
308 | |
309 | return join q{, }, @items, "and $tail"; |
2e33bb59 |
310 | } |
311 | |
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312 | |
313 | # common utilities |
314 | |
fce211ae |
315 | sub not_supported{ |
316 | my($feature) = @_; |
317 | |
318 | $feature ||= ( caller(1) )[3]; # subroutine name |
319 | |
1b9e472d |
320 | local $Carp::CarpLevel = $Carp::CarpLevel + 1; |
321 | Carp::confess("Mouse does not currently support $feature"); |
fce211ae |
322 | } |
323 | |
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324 | sub meta{ |
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325 | return Mouse::Meta::Class->initialize(ref($_[0]) || $_[0]); |
53875581 |
326 | } |
327 | |
328 | sub dump { |
329 | my($self, $maxdepth) = @_; |
330 | |
331 | require 'Data/Dumper.pm'; # we don't want to create its namespace |
332 | my $dd = Data::Dumper->new([$self]); |
333 | $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2); |
334 | $dd->Indent(1); |
335 | return $dd->Dump(); |
336 | } |
337 | |
338 | sub does :method; |
339 | *does = \&does_role; # alias |
340 | |
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341 | 1; |
342 | |
f38ce2d0 |
343 | __END__ |
344 | |
345 | =head1 NAME |
346 | |
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347 | Mouse::Util - Features, with or without their dependencies |
f38ce2d0 |
348 | |
349 | =head1 IMPLEMENTATIONS FOR |
350 | |
ea249879 |
351 | =head2 Moose::Util |
352 | |
353 | =head3 C<find_meta> |
354 | |
355 | =head3 C<does_role> |
356 | |
357 | =head3 C<resolve_metaclass_alias> |
358 | |
359 | =head3 C<apply_all_roles> |
360 | |
361 | =head3 C<english_list> |
362 | |
363 | =head2 Class::MOP |
364 | |
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365 | =head3 C<< is_class_loaded(ClassName) -> Bool >> |
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366 | |
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367 | Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which |
368 | involves checking for the existence of C<$VERSION>, C<@ISA>, and any |
369 | locally-defined method. |
370 | |
371 | =head3 C<< load_class(ClassName) >> |
372 | |
739525d0 |
373 | This will load a given C<ClassName> (or die if it is not loadable). |
1820fffe |
374 | This function can be used in place of tricks like |
375 | C<eval "use $module"> or using C<require>. |
ea249879 |
376 | |
5164490d |
377 | =head3 C<< Mouse::Util::class_of(ClassName or Object) >> |
739525d0 |
378 | |
5164490d |
379 | =head3 C<< Mouse::Util::get_metaclass_by_name(ClassName) >> |
739525d0 |
380 | |
5164490d |
381 | =head3 C<< Mouse::Util::get_all_metaclass_instances() >> |
739525d0 |
382 | |
5164490d |
383 | =head3 C<< Mouse::Util::get_all_metaclass_names() >> |
739525d0 |
384 | |
ea249879 |
385 | =head2 MRO::Compat |
386 | |
387 | =head3 C<get_linear_isa> |
388 | |
389 | =head2 Sub::Identify |
390 | |
391 | =head3 C<get_code_info> |
392 | |
393 | =head1 UTILITIES FOR MOUSE |
394 | |
bedd575c |
395 | =head3 C<not_supported> |
f38ce2d0 |
396 | |
1820fffe |
397 | =head1 SEE ALSO |
398 | |
399 | L<Moose::Util> |
400 | |
5164490d |
401 | L<Class::MOP> |
1820fffe |
402 | |
403 | L<Sub::Identify> |
404 | |
405 | L<MRO::Compat> |
406 | |
f38ce2d0 |
407 | =cut |
408 | |