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package Moose::Meta::Method::Destructor; our $VERSION = '2.2203'; use strict; use warnings; use Devel::GlobalDestruction (); use Scalar::Util 'blessed', 'weaken'; use Try::Tiny; use parent 'Moose::Meta::Method', 'Class::MOP::Method::Inlined'; use Moose::Util 'throw_exception'; sub new { my $class = shift; my %options = @_; (ref $options{options} eq 'HASH') || throw_exception( MustPassAHashOfOptions => params => \%options, class => $class ); ($options{package_name} && $options{name}) || throw_exception( MustSupplyPackageNameAndName => params => \%options, class => $class ); my $self = bless { # from our superclass 'body' => undef, 'package_name' => $options{package_name}, 'name' => $options{name}, # ... 'options' => $options{options}, 'definition_context' => $options{definition_context}, 'associated_metaclass' => $options{metaclass}, } => $class; # we don't want this creating # a cycle in the code, if not # needed weaken($self->{'associated_metaclass'}); $self->_initialize_body; return $self; } ## accessors sub options { (shift)->{'options'} } ## method sub is_needed { my $self = shift; my $metaclass = shift; ( blessed $metaclass && $metaclass->isa('Class::MOP::Class') ) || throw_exception( MethodExpectedAMetaclassObject => metaclass => $metaclass, class => $self ); return $metaclass->find_method_by_name("DEMOLISHALL"); } sub _initialize_body { my $self = shift; # TODO: # the %options should also include a both # a call 'initializer' and call 'SUPER::' # options, which should cover approx 90% # of the possible use cases (even if it # requires some adaption on the part of # the author, after all, nothing is free) my $class = $self->associated_metaclass->name; my @source = ( 'sub {', 'my $self = shift;', 'return ' . $self->_generate_fallback_destructor('$self'), 'if Scalar::Util::blessed($self) ne \'' . $class . '\';', $self->_generate_DEMOLISHALL('$self'), 'return;', '}', ); warn join("\n", @source) if $self->options->{debug}; my $code = try { $self->_compile_code(source => \@source); } catch { my $source = join("\n", @source); throw_exception( CouldNotEvalDestructor => method_destructor_object => $self, source => $source, error => $_ ); }; $self->{'body'} = $code; } sub _generate_fallback_destructor { my $self = shift; my ($inv) = @_; return $inv . '->Moose::Object::DESTROY(@_)'; } sub _generate_DEMOLISHALL { my $self = shift; my ($inv) = @_; my @methods = $self->associated_metaclass->find_all_methods_by_name('DEMOLISH'); return unless @methods; return ( 'local $?;', 'my $igd = Devel::GlobalDestruction::in_global_destruction;', 'Try::Tiny::try {', (map { $inv . '->' . $_->{class} . '::DEMOLISH($igd);' } @methods), '}', 'Try::Tiny::catch {', 'die $_;', '};', ); } 1; # ABSTRACT: Method Meta Object for destructors __END__ =pod =encoding UTF-8 =head1 NAME Moose::Meta::Method::Destructor - Method Meta Object for destructors =head1 VERSION version 2.2203 =head1 DESCRIPTION This class is a subclass of L<Class::MOP::Method::Inlined> that provides Moose-specific functionality for inlining destructors. To understand this class, you should read the L<Class::MOP::Method::Inlined> documentation as well. =head1 INHERITANCE C<Moose::Meta::Method::Destructor> is a subclass of L<Moose::Meta::Method> I<and> L<Class::MOP::Method::Inlined>. =head1 METHODS =head2 Moose::Meta::Method::Destructor->new(%options) This constructs a new object. It accepts the following options: =over 4 =item * package_name The package for the class in which the destructor is being inlined. This option is required. =item * name The name of the destructor method. This option is required. =item * metaclass The metaclass for the class this destructor belongs to. This is optional, as it can be set later by calling C<< $metamethod->attach_to_class >>. =back =head2 Moose::Meta;:Method::Destructor->is_needed($metaclass) Given a L<Moose::Meta::Class> object, this method returns a boolean indicating whether the class needs a destructor. If the class or any of its parents defines a C<DEMOLISH> method, it needs a destructor. =head1 BUGS See L<Moose/BUGS> for details on reporting bugs. =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