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169
database/perl/vendor/lib/Class/MOP/Method/Meta.pm
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169
database/perl/vendor/lib/Class/MOP/Method/Meta.pm
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package Class::MOP::Method::Meta;
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our $VERSION = '2.2014';
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use strict;
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use warnings;
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use Carp 'confess';
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use Scalar::Util 'blessed', 'weaken';
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use constant DEBUG_NO_META => $ENV{DEBUG_NO_META} ? 1 : 0;
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use parent 'Class::MOP::Method';
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sub _is_caller_mop_internal {
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my $self = shift;
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my ($caller) = @_;
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return $caller =~ /^(?:Class::MOP|metaclass)(?:::|$)/;
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}
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sub _generate_meta_method {
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my $method_self = shift;
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my $metaclass = shift;
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weaken($metaclass);
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sub {
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# this will be compiled out if the env var wasn't set
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if (DEBUG_NO_META) {
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confess "'meta' method called by MOP internals"
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# it's okay to call meta methods on metaclasses, since we
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# explicitly ask for them
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if !$_[0]->isa('Class::MOP::Object')
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&& !$_[0]->isa('Class::MOP::Mixin')
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# it's okay if the test itself calls ->meta, we only care about
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# if the mop internals call ->meta
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&& $method_self->_is_caller_mop_internal(scalar caller);
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}
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# we must re-initialize so that it
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# works as expected in subclasses,
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# since metaclass instances are
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# singletons, this is not really a
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# big deal anyway.
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$metaclass->initialize(blessed($_[0]) || $_[0])
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};
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}
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sub wrap {
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my ($class, @args) = @_;
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unshift @args, 'body' if @args % 2 == 1;
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my %params = @args;
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$class->_throw_exception( CannotOverrideBodyOfMetaMethods => params => \%params,
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class => $class
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)
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if $params{body};
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my $metaclass_class = $params{associated_metaclass}->meta;
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$params{body} = $class->_generate_meta_method($metaclass_class);
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return $class->SUPER::wrap(%params);
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}
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sub _make_compatible_with {
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my $self = shift;
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my ($other) = @_;
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# XXX: this is pretty gross. the issue here is that CMOP::Method::Meta
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# objects are subclasses of CMOP::Method, but when we get to moose, they'll
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# need to be compatible with Moose::Meta::Method, which isn't possible. the
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# right solution here is to make ::Meta into a role that gets applied to
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# whatever the method_metaclass happens to be and get rid of
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# _meta_method_metaclass entirely, but that's not going to happen until
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# we ditch cmop and get roles into the bootstrapping, so. i'm not
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# maintaining the previous behavior of turning them into instances of the
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# new method_metaclass because that's equally broken, and at least this way
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# any issues will at least be detectable and potentially fixable. -doy
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return $self unless $other->_is_compatible_with($self->_real_ref_name);
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return $self->SUPER::_make_compatible_with(@_);
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}
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1;
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# ABSTRACT: Method Meta Object for C<meta> methods
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__END__
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=pod
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=encoding UTF-8
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=head1 NAME
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Class::MOP::Method::Meta - Method Meta Object for C<meta> methods
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=head1 VERSION
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version 2.2014
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=head1 DESCRIPTION
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This is a L<Class::MOP::Method> subclass which represents C<meta>
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methods installed into classes by Class::MOP.
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=head1 METHODS
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=over 4
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=item B<< Class::MOP::Method::Wrapped->wrap($metamethod, %options) >>
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This is the constructor. It accepts a L<Class::MOP::Method> object and
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a hash of options. The options accepted are identical to the ones
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accepted by L<Class::MOP::Method>, except that C<body> cannot be passed
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(it will be generated automatically).
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=back
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=head1 AUTHORS
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=over 4
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=item *
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Stevan Little <stevan@cpan.org>
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=item *
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Dave Rolsky <autarch@urth.org>
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=item *
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Jesse Luehrs <doy@cpan.org>
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=item *
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Shawn M Moore <sartak@cpan.org>
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=item *
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יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
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=item *
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Karen Etheridge <ether@cpan.org>
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=item *
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Florian Ragwitz <rafl@debian.org>
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=item *
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Hans Dieter Pearcey <hdp@cpan.org>
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=item *
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Chris Prather <chris@prather.org>
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=item *
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Matt S Trout <mstrout@cpan.org>
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=back
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=head1 COPYRIGHT AND LICENSE
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This software is copyright (c) 2006 by Infinity Interactive, Inc.
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This is free software; you can redistribute it and/or modify it under
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the same terms as the Perl 5 programming language system itself.
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=cut
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