10 use constant _MOUSE_VERBOSE => !!$ENV{MOUSE_VERBOSE};
12 our @ISA = qw(Exporter);
16 resolve_metaclass_alias
35 meta => [qw(does meta dump _MOUSE_VERBOSE)],
38 # aliases as public APIs
41 *class_of = \&Mouse::Meta::Module::class_of;
42 *get_metaclass_by_name = \&Mouse::Meta::Module::get_metaclass_by_name;
43 *get_all_metaclass_instances = \&Mouse::Meta::Module::get_all_metaclass_instances;
44 *get_all_metaclass_names = \&Mouse::Meta::Module::get_all_metaclass_names;
47 # Moose::Util compatible utilities
50 return class_of( $_[0] );
54 my ($class_or_obj, $role_name) = @_;
56 my $meta = class_of($class_or_obj);
59 || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()");
61 return defined($meta) && $meta->does_role($role_name);
66 if ($] >= 5.009_005) {
68 $impl = \&mro::get_linear_isa;
72 eval { require MRO::Compat };
76 $impl = \&mro::get_linear_isa;
78 # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV
79 my $_get_linear_isa_dfs; # this recurses so it isn't pretty
80 $_get_linear_isa_dfs = sub {
83 my $classname = shift;
85 my @lin = ($classname);
87 foreach my $parent (@{"$classname\::ISA"}) {
88 my $plin = $_get_linear_isa_dfs->($parent);
89 foreach my $p(@$plin) {
90 next if exists $stored{$p};
97 # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^
98 $impl = $_get_linear_isa_dfs;
104 *get_linear_isa = $impl;
107 { # taken from Sub::Identify
108 sub get_code_info($) {
110 ref($coderef) or return;
112 my $cv = B::svref_2object($coderef);
113 $cv->isa('B::CV') or return;
116 $gv->isa('B::GV') or return;
118 return ($gv->STASH->NAME, $gv->NAME);
121 sub get_code_package{
124 my $cv = B::svref_2object($coderef);
125 $cv->isa('B::CV') or return '';
128 $gv->isa('B::GV') or return '';
130 return $gv->STASH->NAME;
134 # taken from Mouse::Util (0.90)
138 sub resolve_metaclass_alias {
139 my ( $type, $metaclass_name, %options ) = @_;
141 my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
143 return $cache{$cache_key}{$metaclass_name} ||= do{
145 my $possible_full_name = join '::',
146 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name
149 my $loaded_class = load_first_existing_class(
154 $loaded_class->can('register_implementation')
155 ? $loaded_class->register_implementation
161 # Utilities from Class::MOP
164 # taken from Class/MOP.pm
165 sub is_valid_class_name {
168 return 0 if ref($class);
169 return 0 unless defined($class);
171 return 1 if $class =~ /^\w+(?:::\w+)*$/;
176 # taken from Class/MOP.pm
177 sub load_first_existing_class {
182 for my $class (@classes) {
183 my $e = _try_load_one_class($class);
186 $exceptions{$class} = $e;
197 sprintf( "Could not load class (%s) because : %s",
198 $_, $exceptions{$_} )
203 # taken from Class/MOP.pm
204 sub _try_load_one_class {
207 unless ( is_valid_class_name($class) ) {
208 my $display = defined($class) ? $class : 'undef';
209 confess "Invalid class name ($display)";
212 return if is_class_loaded($class);
214 my $file = $class . '.pm';
219 eval { require($file) };
227 my $e = _try_load_one_class($class);
228 confess "Could not load class ($class) because : $e" if $e;
233 my %is_class_loaded_cache;
234 sub is_class_loaded {
237 return 0 if ref($class) || !defined($class) || !length($class);
239 return 1 if $is_class_loaded_cache{$class};
241 # walk the symbol table tree to avoid autovififying
242 # \*{${main::}{"Foo::"}} == \*main::Foo::
245 foreach my $part (split('::', $class)) {
246 my $entry = \$pack->{$part . '::'};
247 return 0 if ref($entry) ne 'GLOB';
248 $pack = *{$entry}{HASH} or return 0;
251 # check for $VERSION or @ISA
252 return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION}
253 && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} };
254 return ++$is_class_loaded_cache{$class} if exists $pack->{ISA}
255 && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0;
257 # check for any method
258 foreach my $name( keys %{$pack} ) {
259 my $entry = \$pack->{$name};
260 return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE};
268 sub apply_all_roles {
269 my $meta = Mouse::Meta::Class->initialize(shift);
273 # Basis of Data::OptList
274 my $max = scalar(@_);
275 for (my $i = 0; $i < $max ; $i++) {
276 if ($i + 1 < $max && ref($_[$i + 1])) {
277 push @roles, [ $_[$i++] => $_[$i] ];
279 push @roles, [ $_[$i] => undef ];
281 my $role_name = $roles[-1][0];
282 load_class($role_name);
283 ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') )
284 || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role");
287 if ( scalar @roles == 1 ) {
288 my ( $role, $params ) = @{ $roles[0] };
289 $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
292 Mouse::Meta::Role->combine_apply($meta, @roles);
297 # taken from Moose::Util 0.90
299 return $_[0] if @_ == 1;
303 return "$items[0] and $items[1]" if @items == 2;
305 my $tail = pop @items;
307 return join q{, }, @items, "and $tail";
316 $feature ||= ( caller(1) )[3]; # subroutine name
318 local $Carp::CarpLevel = $Carp::CarpLevel + 1;
319 Carp::confess("Mouse does not currently support $feature");
323 return Mouse::Meta::Class->initialize($_[0]);
327 my($self, $maxdepth) = @_;
329 require 'Data/Dumper.pm'; # we don't want to create its namespace
330 my $dd = Data::Dumper->new([$self]);
331 $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2);
337 *does = \&does_role; # alias
345 Mouse::Util - Features, with or without their dependencies
347 =head1 IMPLEMENTATIONS FOR
355 =head3 C<resolve_metaclass_alias>
357 =head3 C<apply_all_roles>
359 =head3 C<english_list>
363 =head3 C<< is_class_loaded(ClassName) -> Bool >>
365 Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which
366 involves checking for the existence of C<$VERSION>, C<@ISA>, and any
367 locally-defined method.
369 =head3 C<< load_class(ClassName) >>
371 This will load a given C<ClassName> (or die if it is not loadable).
372 This function can be used in place of tricks like
373 C<eval "use $module"> or using C<require>.
375 =head2 C<< Mouse::Util::class_of(ClassName) >>
377 The counterpart of C<Class::MOP::class_of()>. This is not exportable.
379 =head2 C<< Mouse::Util::get_metaclass_by_name(ClassName) >>
381 The counterpart of C<Class::MOP::get_metaclass_by_name()>. This is not exportable.
385 =head3 C<get_linear_isa>
389 =head3 C<get_code_info>
391 =head1 UTILITIES FOR MOUSE
393 =head3 C<not_supported>