package Mouse::Util; use strict; use warnings; use Exporter; use Carp qw(confess); our @ISA = qw(Exporter); our @EXPORT_OK = qw( find_meta does_role resolve_metaclass_alias apply_all_roles english_list load_class is_class_loaded get_linear_isa get_code_info not_supported does meta dump ); our %EXPORT_TAGS = ( all => \@EXPORT_OK, meta => [qw(does meta dump)], ); # Moose::Util compatible utilities sub find_meta{ return Mouse::Meta::Module::class_of( $_[0] ); } sub does_role{ my ($class_or_obj, $role_name) = @_; my $meta = Mouse::Meta::Module::class_of($class_or_obj); (defined $role_name) || ($meta || 'Mouse::Meta::Class')->throw_error("You must supply a role name to does()"); return defined($meta) && $meta->does_role($role_name); } BEGIN { my $impl; if ($] >= 5.009_005) { require mro; $impl = \&mro::get_linear_isa; } else { my $e = do { local $@; eval { require MRO::Compat }; $@; }; if (!$e) { $impl = \&mro::get_linear_isa; } else { # VVVVV CODE TAKEN FROM MRO::COMPAT VVVVV my $_get_linear_isa_dfs; # this recurses so it isn't pretty $_get_linear_isa_dfs = sub { no strict 'refs'; my $classname = shift; my @lin = ($classname); my %stored; foreach my $parent (@{"$classname\::ISA"}) { my $plin = $_get_linear_isa_dfs->($parent); foreach my $p(@$plin) { next if exists $stored{$p}; push(@lin, $p); $stored{$p} = 1; } } return \@lin; }; # ^^^^^ CODE TAKEN FROM MRO::COMPAT ^^^^^ $impl = $_get_linear_isa_dfs; } } no warnings 'once'; *get_linear_isa = $impl; } { # taken from Sub::Identify sub get_code_info($) { my ($coderef) = @_; ref($coderef) or return; require B; my $cv = B::svref_2object($coderef); $cv->isa('B::CV') or return; my $gv = $cv->GV; $gv->isa('B::GV') or return; return ($gv->STASH->NAME, $gv->NAME); } } # taken from Mouse::Util (0.90) { my %cache; sub resolve_metaclass_alias { my ( $type, $metaclass_name, %options ) = @_; my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' ); return $cache{$cache_key}{$metaclass_name} ||= do{ my $possible_full_name = join '::', 'Mouse::Meta', $type, 'Custom', ($options{trait} ? 'Trait' : ()), $metaclass_name ; my $loaded_class = load_first_existing_class( $possible_full_name, $metaclass_name ); $loaded_class->can('register_implementation') ? $loaded_class->register_implementation : $loaded_class; }; } } # taken from Class/MOP.pm sub is_valid_class_name { my $class = shift; return 0 if ref($class); return 0 unless defined($class); return 1 if $class =~ /^\w+(?:::\w+)*$/; return 0; } # taken from Class/MOP.pm sub load_first_existing_class { my @classes = @_ or return; my %exceptions; for my $class (@classes) { my $e = _try_load_one_class($class); if ($e) { $exceptions{$class} = $e; } else { return $class; } } # not found confess join( "\n", map { sprintf( "Could not load class (%s) because : %s", $_, $exceptions{$_} ) } @classes ); } # taken from Class/MOP.pm sub _try_load_one_class { my $class = shift; unless ( is_valid_class_name($class) ) { my $display = defined($class) ? $class : 'undef'; confess "Invalid class name ($display)"; } return if is_class_loaded($class); my $file = $class . '.pm'; $file =~ s{::}{/}g; return do { local $@; eval { require($file) }; $@; }; } sub load_class { my $class = shift; my $e = _try_load_one_class($class); confess "Could not load class ($class) because : $e" if $e; return 1; } my %is_class_loaded_cache; sub is_class_loaded { my $class = shift; return 0 if ref($class) || !defined($class) || !length($class); return 1 if $is_class_loaded_cache{$class}; # walk the symbol table tree to avoid autovififying # \*{${main::}{"Foo::"}} == \*main::Foo:: my $pack = \%::; foreach my $part (split('::', $class)) { my $entry = \$pack->{$part . '::'}; return 0 if ref($entry) ne 'GLOB'; $pack = *{$entry}{HASH} or return 0; } # check for $VERSION or @ISA return ++$is_class_loaded_cache{$class} if exists $pack->{VERSION} && defined *{$pack->{VERSION}}{SCALAR} && defined ${ $pack->{VERSION} }; return ++$is_class_loaded_cache{$class} if exists $pack->{ISA} && defined *{$pack->{ISA}}{ARRAY} && @{ $pack->{ISA} } != 0; # check for any method foreach my $name( keys %{$pack} ) { my $entry = \$pack->{$name}; return ++$is_class_loaded_cache{$class} if ref($entry) ne 'GLOB' || defined *{$entry}{CODE}; } # fail return 0; } sub apply_all_roles { my $meta = Mouse::Meta::Class->initialize(shift); my @roles; # Basis of Data::OptList my $max = scalar(@_); for (my $i = 0; $i < $max ; $i++) { if ($i + 1 < $max && ref($_[$i + 1])) { push @roles, [ $_[$i++] => $_[$i] ]; } else { push @roles, [ $_[$i] => undef ]; } my $role_name = $roles[-1][0]; load_class($role_name); ( $role_name->can('meta') && $role_name->meta->isa('Mouse::Meta::Role') ) || $meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); } if ( scalar @roles == 1 ) { my ( $role, $params ) = @{ $roles[0] }; $role->meta->apply( $meta, ( defined $params ? %$params : () ) ); } else { Mouse::Meta::Role->combine_apply($meta, @roles); } return; } # taken from Moose::Util 0.90 sub english_list { return $_[0] if @_ == 1; my @items = sort @_; return "$items[0] and $items[1]" if @items == 2; my $tail = pop @items; return join q{, }, @items, "and $tail"; } # common utilities sub not_supported{ my($feature) = @_; $feature ||= ( caller(1) )[3]; # subroutine name local $Carp::CarpLevel = $Carp::CarpLevel + 1; Carp::confess("Mouse does not currently support $feature"); } sub meta{ return Mouse::Meta::Class->initialize($_[0]); } sub dump { my($self, $maxdepth) = @_; require 'Data/Dumper.pm'; # we don't want to create its namespace my $dd = Data::Dumper->new([$self]); $dd->Maxdepth(defined($maxdepth) ? $maxdepth : 2); $dd->Indent(1); return $dd->Dump(); } sub does :method; *does = \&does_role; # alias 1; __END__ =head1 NAME Mouse::Util - features, with or without their dependencies =head1 IMPLEMENTATIONS FOR =head2 Moose::Util =head3 C =head3 C =head3 C =head3 C =head3 C =head2 Class::MOP =head2 C<< is_class_loaded(ClassName) -> Bool >> Returns whether C is actually loaded or not. It uses a heuristic which involves checking for the existence of C<$VERSION>, C<@ISA>, and any locally-defined method. =head3 C<< load_class(ClassName) >> This will load a given C (or die if it's not loadable). This function can be used in place of tricks like C or using C. =head2 MRO::Compat =head3 C =head2 Sub::Identify =head3 C =head1 UTILITIES FOR MOUSE =over 4 =item * C =back =head1 SEE ALSO L L L L =cut