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package Class::MOP::Mixin::HasOverloads;
our $VERSION = '2.1405';
use strict;
use warnings;
use Class::MOP::Overload;
use Devel::OverloadInfo 'overload_info';
use Scalar::Util 'blessed';
use Sub::Identify 'sub_name', 'stash_name';
use overload ();
use parent 'Class::MOP::Mixin';
sub is_overloaded {
my $self = shift;
return overload::Overloaded($self->name);
}
sub get_overload_list {
my $self = shift;
my $info = $self->_overload_info;
return grep { $_ ne 'fallback' } keys %{$info}
}
sub get_all_overloaded_operators {
my $self = shift;
return map { $self->_overload_for($_) } $self->get_overload_list;
}
sub has_overloaded_operator {
my $self = shift;
my ($op) = @_;
return defined $self->_overload_info->{$op};
}
sub _overload_map {
$_[0]->{_overload_map} ||= {};
}
sub get_overloaded_operator {
my $self = shift;
my ($op) = @_;
return $self->_overload_map->{$op} ||= $self->_overload_for($op);
}
use constant _SET_FALLBACK_EACH_TIME => $] < 5.120;
sub add_overloaded_operator {
my $self = shift;
my ( $op, $overload ) = @_;
my %p = ( associated_metaclass => $self );
if ( !ref $overload ) {
%p = (
%p,
operator => $op,
method_name => $overload,
associated_metaclass => $self,
);
$p{method} = $self->get_method($overload)
if $self->has_method($overload);
$overload = Class::MOP::Overload->new(%p);
}
elsif ( !blessed $overload) {
$overload = Class::MOP::Overload->new(
operator => $op,
coderef => $overload,
coderef_name => sub_name($overload),
coderef_package => stash_name($overload),
%p,
);
}
$overload->attach_to_class($self);
$self->_overload_map->{$op} = $overload;
my %overload = (
$op => $overload->has_coderef
? $overload->coderef
: $overload->method_name
);
# Perl 5.10 and earlier appear to have a bug where setting a new
# overloading operator wipes out the fallback value unless we pass it each
# time.
if (_SET_FALLBACK_EACH_TIME) {
$overload{fallback} = $self->get_overload_fallback_value;
}
$self->name->overload::OVERLOAD(%overload);
}
sub remove_overloaded_operator {
my $self = shift;
my ($op) = @_;
delete $self->_overload_map->{$op};
# overload.pm provides no api for this - but the problem that makes this
# necessary has been fixed in 5.18
$self->get_or_add_package_symbol('%OVERLOAD')->{dummy}++
if $] < 5.017000;
$self->remove_package_symbol('&(' . $op);
}
sub get_overload_fallback_value {
my $self = shift;
return $self->_overload_info->{fallback}{value};
}
sub set_overload_fallback_value {
my $self = shift;
my $value = shift;
$self->name->overload::OVERLOAD( fallback => $value );
}
# We could cache this but we'd need some logic to clear it at all the right
# times, which seems more tedious than it's worth.
sub _overload_info {
my $self = shift;
return overload_info( $self->name ) || {};
}
sub _overload_for {
my $self = shift;
my $op = shift;
my $map = $self->_overload_map;
return $map->{$op} if $map->{$op};
my $info = $self->_overload_info->{$op};
return unless $info;
my %p = (
operator => $op,
associated_metaclass => $self,
);
if ( $info->{code} && !$info->{method_name} ) {
$p{coderef} = $info->{code};
@p{ 'coderef_package', 'coderef_name' }
= $info->{code_name} =~ /(.+)::([^:]+)/;
}
else {
$p{method_name} = $info->{method_name};
if ( $self->has_method( $p{method_name} ) ) {
$p{method} = $self->get_method( $p{method_name} );
}
}
return $map->{$op} = Class::MOP::Overload->new(%p);
}
1;
# ABSTRACT: Methods for metaclasses which have overloads
__END__
=pod
=encoding UTF-8
=head1 NAME
Class::MOP::Mixin::HasOverloads - Methods for metaclasses which have overloads
=head1 VERSION
version 2.1405
=head1 DESCRIPTION
This class implements methods for metaclasses which have overloads
(L<Class::MOP::Clas> and L<Moose::Meta::Role>). See L<Class::MOP::Class> for
API details.
=head1 AUTHORS
=over 4
=item *
Stevan Little <stevan.little@iinteractive.com>
=item *
Dave Rolsky <autarch@urth.org>
=item *
Jesse Luehrs <doy@tozt.net>
=item *
Shawn M Moore <code@sartak.org>
=item *
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
=item *
Karen Etheridge <ether@cpan.org>
=item *
Florian Ragwitz <rafl@debian.org>
=item *
Hans Dieter Pearcey <hdp@weftsoar.net>
=item *
Chris Prather <chris@prather.org>
=item *
Matt S Trout <mst@shadowcat.co.uk>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2006 by Infinity Interactive, Inc..
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
|
