12 resolve_metaclass_alias
28 meta => [qw(does meta dump)],
31 # Moose::Util compatible utilities
34 return Mouse::Meta::Module::class_of( $_[0] );
38 my ($class_or_obj, $role_name) = @_;
40 my $meta = Mouse::Meta::Module::class_of($class_or_obj);
43 || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()");
45 return defined($meta) && $meta->does_role($role_name);
52 if ($] >= 5.009_005) {
54 $impl = \&mro::get_linear_isa;
58 eval { require MRO::Compat };
62 $impl = \&mro::get_linear_isa;
64 # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV
65 my $_get_linear_isa_dfs; # this recurses so it isn't pretty
66 $_get_linear_isa_dfs = sub {
69 my $classname = shift;
71 my @lin = ($classname);
73 foreach my $parent (@{"$classname\::ISA"}) {
74 my $plin = $_get_linear_isa_dfs->($parent);
75 foreach my $p(@$plin) {
76 next if exists $stored{$p};
83 # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^
84 $impl = $_get_linear_isa_dfs;
90 *get_linear_isa = $impl;
93 { # taken from Sub::Identify
94 sub get_code_info($) {
96 ref($coderef) or return;
98 my $cv = B::svref_2object($coderef);
99 $cv->isa('B::CV') or return;
102 $gv->isa('B::GV') or return;
104 return ($gv->STASH->NAME, $gv->NAME);
108 # taken from Mouse::Util (0.90)
112 sub resolve_metaclass_alias {
113 my ( $type, $metaclass_name, %options ) = @_;
115 my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
117 return $cache{$cache_key}{$metaclass_name} ||= do{
119 my $possible_full_name = join '::',
120 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name
123 my $loaded_class = load_first_existing_class(
128 $loaded_class->can('register_implementation')
129 ? $loaded_class->register_implementation
135 # taken from Class/MOP.pm
136 sub is_valid_class_name {
139 return 0 if ref($class);
140 return 0 unless defined($class);
142 return 1 if $class =~ /^\w+(?:::\w+)*$/;
147 # taken from Class/MOP.pm
148 sub load_first_existing_class {
153 for my $class (@classes) {
154 my $e = _try_load_one_class($class);
157 $exceptions{$class} = $e;
168 sprintf( "Could not load class (%s) because : %s",
169 $_, $exceptions{$_} )
174 # taken from Class/MOP.pm
175 sub _try_load_one_class {
178 unless ( is_valid_class_name($class) ) {
179 my $display = defined($class) ? $class : 'undef';
180 confess "Invalid class name ($display)";
183 return if is_class_loaded($class);
185 my $file = $class . '.pm';
190 eval { require($file) };
198 my $e = _try_load_one_class($class);
199 confess "Could not load class ($class) because : $e" if $e;
204 my %is_class_loaded_cache;
205 sub is_class_loaded {
208 return 0 if ref($class) || !defined($class) || !length($class);
210 return 1 if $is_class_loaded_cache{$class};
212 # walk the symbol table tree to avoid autovififying
213 # \*{${main::}{"Foo::"}} == \*main::Foo::
216 foreach my $part (split('::', $class)) {
217 my $entry = \$pack->{$part . '::'};
218 return 0 if ref($entry) ne 'GLOB';
219 $pack = *{$entry}{HASH} or return 0;
222 # check for $VERSION or @ISA
223 return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION}
224 && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} };
225 return ++$is_class_loaded_cache{$class} if exists $pack->{ISA}
226 && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0;
228 # check for any method
229 foreach my $name( keys %{$pack} ) {
230 my $entry = \$pack->{$name};
231 return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE};
239 sub apply_all_roles {
240 my $meta = Mouse::Meta::Class->initialize(shift);
244 # Basis of Data::OptList
245 my $max = scalar(@_);
246 for (my $i = 0; $i < $max ; $i++) {
247 if ($i + 1 < $max && ref($_[$i + 1])) {
248 push @roles, [ $_[$i++] => $_[$i] ];
250 push @roles, [ $_[$i] => {} ];
252 my $role_name = $roles[-1][0];
253 load_class($role_name);
254 ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') )
255 || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role");
258 if ( scalar @roles == 1 ) {
259 my ( $role, $params ) = @{ $roles[0] };
260 $role->meta->apply( $meta, ( defined $params ? %$params : () ) );
263 Mouse::Meta::Role->combine_apply($meta, @roles);
268 # taken from Moose::Util 0.90
270 return $_[0] if @_ == 1;
274 return "$items[0] and $items[1]" if @items == 2;
276 my $tail = pop @items;
278 return join q{, }, @items, "and $tail";
287 $feature ||= ( caller(1) )[3]; # subroutine name
289 local $Carp::CarpLevel = $Carp::CarpLevel + 1;
290 Carp::confess("Mouse does not currently support $feature");
294 return Mouse::Meta::Class->initialize($_[0]);
298 my($self, $maxdepth) = @_;
300 require 'Data/Dumper.pm'; # we don't want to create its namespace
301 my $dd = Data::Dumper->new([$self]);
302 $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2);
308 *does = \&does_role; # alias
316 Mouse::Util - features, with or without their dependencies
318 =head1 IMPLEMENTATIONS FOR
326 =head3 C<resolve_metaclass_alias>
328 =head3 C<apply_all_roles>
330 =head3 C<english_list>
334 =head2 C<< is_class_loaded(ClassName) -> Bool >>
336 Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which
337 involves checking for the existence of C<$VERSION>, C<@ISA>, and any
338 locally-defined method.
340 =head3 C<< load_class(ClassName) >>
342 This will load a given C<ClassName> (or die if it's not loadable).
343 This function can be used in place of tricks like
344 C<eval "use $module"> or using C<require>.
348 =head3 C<get_linear_isa>
352 =head3 C<get_code_info>
354 =head1 UTILITIES FOR MOUSE