use strict;
use warnings;
use base qw/Exporter/;
+
use Carp qw(confess);
use B ();
our @EXPORT_OK = qw(
- get_linear_isa
+ find_meta
+ does_role
+ resolve_metaclass_alias
apply_all_roles
- version
- authority
- identifier
+ 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) {
}
}
- no strict 'refs';
- *{ __PACKAGE__ . '::get_linear_isa'} = $impl;
+
+ no warnings 'once';
+ *get_linear_isa = $impl;
}
{ # taken from Sub::Identify
- sub get_code_info($) {\r
- my ($coderef) = @_;\r
- ref($coderef) or return;\r
- my $cv = B::svref_2object($coderef);\r
+ sub get_code_info($) {
+ my ($coderef) = @_;
+ ref($coderef) or return;
+
+ my $cv = B::svref_2object($coderef);
$cv->isa('B::CV') or return;
- my $gv = $cv->GV;\r
- # bail out if GV is undefined\r
- $gv->isa('B::SPECIAL') and return;\r
-\r
- return ($gv->STASH->NAME, $gv->NAME);\r
- }\r
-}
+ my $gv = $cv->GV;
+ $gv->isa('B::GV') or return;
-{ # adapted from Class::MOP::Module
-
- sub version { no strict 'refs'; ${shift->name.'::VERSION'} }
- sub authority { no strict 'refs'; ${shift->name.'::AUTHORITY'} }
- sub identifier {
- my $self = shift;
- join '-' => (
- $self->name,
- ($self->version || ()),
- ($self->authority || ()),
- );
+ return ($gv->STASH->NAME, $gv->NAME);
}
}
-# taken from Class/MOP.pm
+# taken from Mouse::Util (0.90)
{
my %cache;
sub resolve_metaclass_alias {
my ( $type, $metaclass_name, %options ) = @_;
- my $cache_key = $type;
- return $cache{$cache_key}{$metaclass_name}
- if $cache{$cache_key}{$metaclass_name};
+ my $cache_key = $type . q{ } . ( $options{trait} ? '-Trait' : '' );
- my $possible_full_name =
- 'Mouse::Meta::'
- . $type
- . '::Custom::'
- . $metaclass_name;
+ return $cache{$cache_key}{$metaclass_name} ||= do{
- my $loaded_class =
- load_first_existing_class( $possible_full_name,
- $metaclass_name );
+ 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
+ );
- return $cache{$cache_key}{$metaclass_name} =
$loaded_class->can('register_implementation')
- ? $loaded_class->register_implementation
- : $loaded_class;
+ ? $loaded_class->register_implementation
+ : $loaded_class;
+ };
}
}
# taken from Class/MOP.pm
-sub _is_valid_class_name {
+sub is_valid_class_name {
my $class = shift;
return 0 if ref($class);
return 0 unless defined($class);
- return 0 unless length($class);
return 1 if $class =~ /^\w+(?:::\w+)*$/;
my @classes = @_
or return;
- foreach my $class (@classes) {
- unless ( _is_valid_class_name($class) ) {
- my $display = defined($class) ? $class : 'undef';
- confess "Invalid class name ($display)";
- }
- }
-
- my $found;
my %exceptions;
for my $class (@classes) {
my $e = _try_load_one_class($class);
$exceptions{$class} = $e;
}
else {
- $found = $class;
- last;
+ return $class;
}
}
- return $found if $found;
+ # not found
confess join(
"\n",
map {
sub _try_load_one_class {
my $class = shift;
- return if Mouse::is_class_loaded($class);
+ 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;
};
}
+
+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);
} else {
push @roles, [ $_[$i] => {} ];
}
+ 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");
}
- foreach my $role_spec (@roles) {
- Mouse::load_class( $role_spec->[0] );
- }
-
- ( $_->[0]->can('meta') && $_->[0]->meta->isa('Mouse::Meta::Role') )
- || confess("You can only consume roles, "
- . $_->[0]
- . " is not a Moose role")
- foreach @roles;
-
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 $dd->Dump();
+}
+
+sub does :method;
+*does = \&does_role; # alias
+
1;
__END__
=head1 IMPLEMENTATIONS FOR
-=head2 L<MRO::Compat>
+=head2 Moose::Util
+
+=head3 C<find_meta>
+
+=head3 C<does_role>
+
+=head3 C<resolve_metaclass_alias>
+
+=head3 C<apply_all_roles>
+
+=head3 C<english_list>
+
+=head2 Class::MOP
+
+=head2 C<< is_class_loaded(ClassName) -> Bool >>
+
+Returns whether C<ClassName> is actually loaded or not. It uses a heuristic which
+involves checking for the existence of C<$VERSION>, C<@ISA>, and any
+locally-defined method.
+
+=head3 C<< load_class(ClassName) >>
+
+This will load a given C<ClassName> (or die if it's not loadable).
+This function can be used in place of tricks like
+C<eval "use $module"> or using C<require>.
+
+=head2 MRO::Compat
+
+=head3 C<get_linear_isa>
+
+=head2 Sub::Identify
+
+=head3 C<get_code_info>
+
+=head1 UTILITIES FOR MOUSE
+
+=over 4
+
+=item *
+
+C<not_supported>
+
+=back
+
+=head1 SEE ALSO
+
+L<Moose::Util>
+
+L<Scalar::Util>
+
+L<Sub::Identify>
-=head3 get_linear_isa
+L<MRO::Compat>
=cut
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