11 resolve_metaclass_alias
27 meta => [qw(does meta dump)],
30 # Moose::Util compatible utilities
33 return Mouse::Meta::Module::class_of( $_[0] );
37 my ($class_or_obj, $role_name) = @_;
39 my $meta = Mouse::Meta::Module::class_of($class_or_obj);
42 || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()");
44 return defined($meta) && $meta->does_role($role_name);
51 if ($] >= 5.009_005) {
53 $impl = \&mro::get_linear_isa;
57 eval { require MRO::Compat };
61 $impl = \&mro::get_linear_isa;
63 # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV
64 my $_get_linear_isa_dfs; # this recurses so it isn't pretty
65 $_get_linear_isa_dfs = sub {
68 my $classname = shift;
70 my @lin = ($classname);
72 foreach my $parent (@{"$classname\::ISA"}) {
73 my $plin = $_get_linear_isa_dfs->($parent);
74 foreach my $p(@$plin) {
75 next if exists $stored{$p};
82 # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^
83 $impl = $_get_linear_isa_dfs;
89 *get_linear_isa = $impl;
92 { # taken from Sub::Identify
93 sub get_code_info($) {
95 ref($coderef) or return;
99 my $cv = B::svref_2object($coderef);
100 $cv->isa('B::CV') or return;
103 $gv->isa('B::GV') or return;
105 return ($gv->STASH->NAME, $gv->NAME);
109 # taken from Mouse::Util (0.90)
113 sub resolve_metaclass_alias {
114 my ( $type, $metaclass_name, %options ) = @_;
116 my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
118 return $cache{$cache_key}{$metaclass_name} ||= do{
120 my $possible_full_name = join '::',
121 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name
124 my $loaded_class = load_first_existing_class(
129 $loaded_class->can('register_implementation')
130 ? $loaded_class->register_implementation
136 # taken from Class/MOP.pm
137 sub is_valid_class_name {
140 return 0 if ref($class);
141 return 0 unless defined($class);
143 return 1 if $class =~ /^\w+(?:::\w+)*$/;
148 # taken from Class/MOP.pm
149 sub load_first_existing_class {
154 for my $class (@classes) {
155 my $e = _try_load_one_class($class);
158 $exceptions{$class} = $e;
169 sprintf( "Could not load class (%s) because : %s",
170 $_, $exceptions{$_} )
175 # taken from Class/MOP.pm
176 sub _try_load_one_class {
179 unless ( is_valid_class_name($class) ) {
180 my $display = defined($class) ? $class : 'undef';
181 confess "Invalid class name ($display)";
184 return if is_class_loaded($class);
186 my $file = $class . '.pm';
191 eval { require($file) };
199 my $e = _try_load_one_class($class);
200 confess "Could not load class ($class) because : $e" if $e;
205 my %is_class_loaded_cache;
206 sub is_class_loaded {
209 return 0 if ref($class) || !defined($class) || !length($class);
211 return 1 if $is_class_loaded_cache{$class};
213 # walk the symbol table tree to avoid autovififying
214 # \*{${main::}{"Foo::"}} == \*main::Foo::
217 foreach my $part (split('::', $class)) {
218 my $entry = \$pack->{$part . '::'};
219 return 0 if ref($entry) ne 'GLOB';
220 $pack = *{$entry}{HASH} or return 0;
223 # check for $VERSION or @ISA
224 return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION}
225 && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} };
226 return ++$is_class_loaded_cache{$class} if exists $pack->{ISA}
227 && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0;
229 # check for any method
230 foreach my $name( keys %{$pack} ) {
231 my $entry = \$pack->{$name};
232 return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE};
240 sub apply_all_roles {
241 my $meta = Mouse::Meta::Class->initialize(shift);
245 # Basis of Data::OptList
246 my $max = scalar(@_);
247 for (my $i = 0; $i < $max ; $i++) {
248 if ($i + 1 < $max && ref($_[$i + 1])) {
249 push @roles, [ $_[$i++] => $_[$i] ];
251 push @roles, [ $_[$i] => undef ];
253 my $role_name = $roles[-1][0];
254 load_class($role_name);
255 ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') )
256 || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role");
259 if ( scalar @roles == 1 ) {
260 my ( $role, $params ) = @{ $roles[0] };
261 $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
264 Mouse::Meta::Role->combine_apply($meta, @roles);
269 # taken from Moose::Util 0.90
271 return $_[0] if @_ == 1;
275 return "$items[0] and $items[1]" if @items == 2;
277 my $tail = pop @items;
279 return join q{, }, @items, "and $tail";
288 $feature ||= ( caller(1) )[3]; # subroutine name
290 local $Carp::CarpLevel = $Carp::CarpLevel + 1;
291 Carp::confess("Mouse does not currently support $feature");
295 return Mouse::Meta::Class->initialize($_[0]);
299 my($self, $maxdepth) = @_;
301 require 'Data/Dumper.pm'; # we don't want to create its namespace
302 my $dd = Data::Dumper->new([$self]);
303 $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2);
309 *does = \&does_role; # alias
317 Mouse::Util - features, with or without their dependencies
319 =head1 IMPLEMENTATIONS FOR
327 =head3 C<resolve_metaclass_alias>
329 =head3 C<apply_all_roles>
331 =head3 C<english_list>
335 =head2 C<< is_class_loaded(ClassName) -> Bool >>
337 Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which
338 involves checking for the existence of C<$VERSION>, C<@ISA>, and any
339 locally-defined method.
341 =head3 C<< load_class(ClassName) >>
343 This will load a given C<ClassName> (or die if it's not loadable).
344 This function can be used in place of tricks like
345 C<eval "use $module"> or using C<require>.
349 =head3 C<get_linear_isa>
353 =head3 C<get_code_info>
355 =head1 UTILITIES FOR MOUSE