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package # this is an example for install_subroutine()/uninstall_subroutine().
Sub::Exporter::Lexical;
use 5.008_001;
use strict;
use warnings;
use Data::Util;
use Carp ();
sub import :method{
my $class = shift;
my $exportee = caller;
$class->setup_installer($exportee, @_);
}
sub setup_installer :method{
my($exporter, $exportee, %args) = @_;
my $exportable_ref = Data::Util::mkopt_hash $args{exports}, 'setup', 'CODE';
while(my($name, $entity) = each %{$exportable_ref}){
unless($entity){
$exportable_ref->{$name} = Data::Util::get_code_ref($exportee, $name, -create);
}
}
Data::Util::install_subroutine($exportee, import => sub :method{
my $class = shift;
my $export_ref;
if(@_){
$export_ref = {};
for my $name(@_){
$export_ref->{$name} = $exportable_ref->{$name}
or Carp::croak "$name is not exportable in $exportee";
}
}
else{
$export_ref = $exportable_ref;
}
my $into = caller;
Data::Util::install_subroutine($into, %{$export_ref});
$^H |= 0x020000; # HINT_LOCALIZE_HH
my $cleaner = $^H{$exporter .'/'. $into} ||= bless [$into], $exporter;
push @{$cleaner}, %{$export_ref};
return;
});
}
sub DESTROY :method{
my($self) = @_;
Data::Util::uninstall_subroutine(@{$self});
}
1;
__END__
=head1 NAME
Sub::Exporter::Lexical - Exports subrtouines lexically
=head1 SYNOPSIS
package Foo;
use Sub::Exporter::Lexical
exports => [
qw(foo bar),
baz => \&bar, # i.e. the synonym of bar
],
;
# ...
{
use Foo;
foo(...); # Foo::foo(...)
bar(...); # Foo::bar(...)
baz(...); # Foo::bar(...), too
} # foo, bar and baz are uninstalled
foo(); # fatal!
bar(); # fatal!
baz(); # fatal!
=head1 SEE ALSO
L<Data::Util>.
=cut
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