package Mouse::Util; use Mouse::Exporter; # enables strict and warnings BEGIN{ # Because Mouse::Util is loaded first in all the Mouse sub-modules, # XS loader is placed here, not in Mouse.pm. our $VERSION = '0.40_03'; my $need_pp = !!$ENV{MOUSE_PUREPERL}; if(!$need_pp && !exists $INC{'Mouse/PurePerl.pm'}){ local $@; # XXX: XSLoader tries to get the object path from caller's file name # $hack_mouse_file fools its mechanism (my $hack_mouse_file = __FILE__) =~ s/.Util//; # .../Mouse/Util.pm -> .../Mouse.pm $need_pp = !eval sprintf("#line %d %s\n", __LINE__, $hack_mouse_file) . q{ require XSLoader; XSLoader::load('Mouse', $VERSION); }; #warn $@ if $@; } if($need_pp){ require 'Mouse/PurePerl.pm'; # we don't want to create its namespace } } use Carp (); use Scalar::Util (); use constant _MOUSE_VERBOSE => !!$ENV{MOUSE_VERBOSE}; Mouse::Exporter->setup_import_methods( as_is => [qw( find_meta does_role resolve_metaclass_alias apply_all_roles english_list load_class is_class_loaded get_linear_isa get_code_info get_code_package get_code_ref not_supported does meta dump _MOUSE_VERBOSE )], groups => { default => [], # export no functions by default # The ':meta' group is 'use metaclass' for Mouse meta => [qw(does meta dump _MOUSE_VERBOSE)], }, ); # aliases as public APIs # it must be 'require', not 'use', because Mouse::Meta::Module depends on Mouse::Util require Mouse::Meta::Module; # for the entities of metaclass cache utilities BEGIN { *class_of = \&Mouse::Meta::Module::class_of; *get_metaclass_by_name = \&Mouse::Meta::Module::get_metaclass_by_name; *get_all_metaclass_instances = \&Mouse::Meta::Module::get_all_metaclass_instances; *get_all_metaclass_names = \&Mouse::Meta::Module::get_all_metaclass_names; } # Moose::Util compatible utilities sub find_meta{ return class_of( $_[0] ); } sub does_role{ my ($class_or_obj, $role_name) = @_; my $meta = class_of($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 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; }; } } # Utilities from Class::MOP sub get_code_info; sub get_code_package; # 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 Carp::confess join( "\n", map { sprintf( "Could not load class (%s) because : %s", $_, $exceptions{$_} ) } @classes ); } # taken from Class/MOP.pm my %is_class_loaded_cache; sub _try_load_one_class { my $class = shift; unless ( is_valid_class_name($class) ) { my $display = defined($class) ? $class : 'undef'; Carp::confess "Invalid class name ($display)"; } return undef if $is_class_loaded_cache{$class} ||= 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); Carp::confess "Could not load class ($class) because : $e" if $e; return 1; } sub is_class_loaded; sub apply_all_roles { my $applicant = Scalar::Util::blessed($_[0]) ? shift # instance : Mouse::Meta::Class->initialize(shift); # class or role name 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); Mouse::Util::TypeConstraints::_is_a_metarole( get_metaclass_by_name($role_name) ) || $applicant->meta->throw_error("You can only consume roles, $role_name(".$role_name->meta.") is not a Mouse role"); } if ( scalar @roles == 1 ) { my ( $role_name, $params ) = @{ $roles[0] }; get_metaclass_by_name($role_name)->apply( $applicant, defined $params ? $params : () ); } else { Mouse::Meta::Role->combine(@roles)->apply($applicant); } 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 $feature"); } # general meta() method sub meta :method{ return Mouse::Meta::Class->initialize(ref($_[0]) || $_[0]); } # general dump() method sub dump :method { my($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 $dd->Dump(); } # general does() method sub does :method; *does = \&does_role; # alias 1; __END__ =head1 NAME Mouse::Util - Features, with or without their dependencies =head1 VERSION This document describes Mouse version 0.40_03 =head1 IMPLEMENTATIONS FOR =head2 Moose::Util =head3 C =head3 C =head3 C =head3 C =head3 C =head2 Class::MOP =head3 C<< is_class_loaded(ClassName) -> Bool >> Returns whether C is actually loaded or not. It uses a heuristic which involves checking for the existence of C<$VERSION>, C<@ISA>, and any locally-defined method. =head3 C<< load_class(ClassName) >> This will load a given C (or die if it is not loadable). This function can be used in place of tricks like C or using C. =head3 C<< Mouse::Util::class_of(ClassName or Object) >> =head3 C<< Mouse::Util::get_metaclass_by_name(ClassName) >> =head3 C<< Mouse::Util::get_all_metaclass_instances() >> =head3 C<< Mouse::Util::get_all_metaclass_names() >> =head2 MRO::Compat =head3 C =head2 Sub::Identify =head3 C =head1 UTILITIES FOR MOUSE =head3 C =head1 SEE ALSO L L L L =cut