—

              
package Class::MOP::Method;
our $VERSION = '2.2207';
use strict;
use warnings;
use Scalar::Util 'weaken', 'reftype', 'blessed';
use parent 'Class::MOP::Object';
# NOTE:
# if poked in the right way,
# they should act like CODE refs.
use overload
    '&{}' => sub { $_[0]->body },
    'bool' => sub { 1 },
    '""' => sub { overload::StrVal($_[0]) },
    fallback => 1;
# construction
sub wrap {
    my ( $class, @args ) = @_;
    unshift @args, 'body' if @args % 2 == 1;
    my %params = @args;
    my $code = $params{body};
    if (blessed($code) && $code->isa(__PACKAGE__)) {
        my $method = $code->clone;
        delete $params{body};
        Class::MOP::class_of($class)->rebless_instance($method, %params);
        return $method;
    }
    elsif (!ref $code || 'CODE' ne reftype($code)) {
        $class->_throw_exception( WrapTakesACodeRefToBless => params => \%params,
                                                                  class  => $class,
                                                                  code   => $code
                                    );
    }
    ($params{package_name} && $params{name})
        || $class->_throw_exception( PackageNameAndNameParamsNotGivenToWrap => params => \%params,
                                                                                   class  => $class,
                                                                                   code   => $code
                                       );
    my $self = $class->_new(\%params);
    weaken($self->{associated_metaclass}) if $self->{associated_metaclass};
    return $self;
}
sub _new {
    my $class = shift;
    return Class::MOP::Class->initialize($class)->new_object(@_)
        if $class ne __PACKAGE__;
    my $params = @_ == 1 ? $_[0] : {@_};
    return bless {
        'body'                 => $params->{body},
        'associated_metaclass' => $params->{associated_metaclass},
        'package_name'         => $params->{package_name},
        'name'                 => $params->{name},
        'original_method'      => $params->{original_method},
    } => $class;
}
## accessors
sub associated_metaclass { shift->{'associated_metaclass'} }
sub attach_to_class {
    my ( $self, $class ) = @_;
    $self->{associated_metaclass} = $class;
    weaken($self->{associated_metaclass});
}
sub detach_from_class {
    my $self = shift;
    delete $self->{associated_metaclass};
}
sub fully_qualified_name {
    my $self = shift;
    $self->package_name . '::' . $self->name;
}
sub original_method { (shift)->{'original_method'} }
sub _set_original_method { $_[0]->{'original_method'} = $_[1] }
# It's possible that this could cause a loop if there is a circular
# reference in here. That shouldn't ever happen in normal
# circumstances, since original method only gets set when clone is
# called. We _could_ check for such a loop, but it'd involve some sort
# of package-lexical variable, and wouldn't be terribly subclassable.
sub original_package_name {
    my $self = shift;
    $self->original_method
        ? $self->original_method->original_package_name
        : $self->package_name;
}
sub original_name {
    my $self = shift;
    $self->original_method
        ? $self->original_method->original_name
        : $self->name;
}
sub original_fully_qualified_name {
    my $self = shift;
    $self->original_method
        ? $self->original_method->original_fully_qualified_name
        : $self->fully_qualified_name;
}
sub execute {
    my $self = shift;
    $self->body->(@_);
}
# We used to go through use Class::MOP::Class->clone_instance to do this, but
# this was awfully slow. This method may be called a number of times when
# classes are loaded (especially during Moose role application), so it is
# worth optimizing. - DR
sub clone {
    my $self = shift;
    my $clone = bless { %{$self}, @_ }, blessed($self);
    weaken($clone->{associated_metaclass}) if $clone->{associated_metaclass};
    $clone->_set_original_method($self);
    return $clone;
}
sub _inline_throw_exception {
    my ( $self, $exception_type, $throw_args ) = @_;
    return
          'die Module::Runtime::use_module("Moose::Exception::'
        . $exception_type
        . '")->new('
        . ( $throw_args || '' ) . ')';
}
1;
# ABSTRACT: Method Meta Object
__END__
HideShow 197 lines of Pod
=pod
=encoding UTF-8
=head1 NAME
Class::MOP::Method - Method Meta Object
=head1 VERSION
version 2.2207
=head1 DESCRIPTION
The Method Protocol is very small, since methods in Perl 5 are just
subroutines in a specific package. We provide a very basic
introspection interface.
=head1 METHODS
=over 4
=item B<< Class::MOP::Method->wrap($code, %options) >>
This is the constructor. It accepts a method body in the form of
either a code reference or a L<Class::MOP::Method> instance, followed
by a hash of options.
The options are:
=over 8
=item * name
The method name (without a package name). This is required if C<$code>
is a coderef.
=item * package_name
The package name for the method. This is required if C<$code> is a
coderef.
=item * associated_metaclass
An optional L<Class::MOP::Class> object. This is the metaclass for the
method's class.
=back
=item B<< $metamethod->clone(%params) >>
This makes a shallow clone of the method object. In particular,
subroutine reference itself is shared between all clones of a given
method.
When a method is cloned, the original method object will be available
by calling C<original_method> on the clone.
=item B<< $metamethod->body >>
This returns a reference to the method's subroutine.
=item B<< $metamethod->name >>
This returns the method's name.
=item B<< $metamethod->package_name >>
This returns the method's package name.
=item B<< $metamethod->fully_qualified_name >>
This returns the method's fully qualified name (package name and
method name).
=item B<< $metamethod->associated_metaclass >>
This returns the L<Class::MOP::Class> object for the method, if one
exists.
=item B<< $metamethod->original_method >>
If this method object was created as a clone of some other method
object, this returns the object that was cloned.
=item B<< $metamethod->original_name >>
This returns the method's original name, wherever it was first
defined.
If this method is a clone of a clone (of a clone, etc.), this method
returns the name from the I<first> method in the chain of clones.
=item B<< $metamethod->original_package_name >>
This returns the method's original package name, wherever it was first
defined.
If this method is a clone of a clone (of a clone, etc.), this method
returns the package name from the I<first> method in the chain of
clones.
=item B<< $metamethod->original_fully_qualified_name >>
This returns the method's original fully qualified name, wherever it
was first defined.
If this method is a clone of a clone (of a clone, etc.), this method
returns the fully qualified name from the I<first> method in the chain
of clones.
=item B<< $metamethod->is_stub >>
Returns true if the method is just a stub:
  sub foo;
=item B<< $metamethod->attach_to_class($metaclass) >>
Given a L<Class::MOP::Class> object, this method sets the associated
metaclass for the method. This will overwrite any existing associated
metaclass.
=item B<< $metamethod->detach_from_class >>
Removes any associated metaclass object for the method.
=item B<< $metamethod->execute(...) >>
This executes the method. Any arguments provided will be passed on to
the method itself.
=item B<< Class::MOP::Method->meta >>
This will return a L<Class::MOP::Class> instance for this class.
It should also be noted that L<Class::MOP> will actually bootstrap
this module by installing a number of attribute meta-objects into its
metaclass.
=back
=head1 AUTHORS
=over 4
=item *
Stevan Little <stevan@cpan.org>
=item *
Dave Rolsky <autarch@urth.org>
=item *
Jesse Luehrs <doy@cpan.org>
=item *
Shawn M Moore <sartak@cpan.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@cpan.org>
=item *
Chris Prather <chris@prather.org>
=item *
Matt S Trout <mstrout@cpan.org>
=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