/usr/share/perl5/MooseX/Attribute/ChainedClone.pm is in libmoosex-attribute-chained-perl 1.0.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of MooseX-Attribute-Chained
#
# This software is copyright (c) 2012 by Moritz Onken.
#
# This is free software; you can redistribute it and/or modify it under
# the same terms as the Perl 5 programming language system itself.
#
package MooseX::Attribute::ChainedClone;
{
$MooseX::Attribute::ChainedClone::VERSION = '1.0.1';
}
# ABSTRACT: Attribute that returns a cloned instance
use Moose::Util;
Moose::Util::meta_attribute_alias(
ChainedClone => 'MooseX::Traits::Attribute::ChainedClone' );
package MooseX::Traits::Attribute::ChainedClone;
{
$MooseX::Traits::Attribute::ChainedClone::VERSION = '1.0.1';
}
use Moose::Role;
override accessor_metaclass => sub {
'MooseX::Attribute::ChainedClone::Method::Accessor';
};
package MooseX::Attribute::ChainedClone::Method::Accessor;
{
$MooseX::Attribute::ChainedClone::Method::Accessor::VERSION = '1.0.1';
}
use Carp qw(confess);
use Try::Tiny;
use base 'Moose::Meta::Method::Accessor';
sub _generate_accessor_method_inline {
my $self = shift;
my $attr = $self->associated_attribute;
my $clone
= $attr->associated_class->has_method("clone")
? '$_[0]->clone'
: 'bless { %{$_[0]} }, ref $_[0]';
if ( $Moose::VERSION >= 1.9900 ) {
return try {
$self->_compile_code(
[ 'sub {',
'if (@_ > 1) {',
'my $clone = ' . $clone . ';',
$attr->_inline_set_value( '$clone', '$_[1]' ),
'return $clone;',
'}',
$attr->_inline_get_value('$_[0]'),
'}',
]
);
}
catch {
confess "Could not generate inline accessor because : $_";
};
}
else {
my ( $code, $e ) = $self->_eval_closure(
{},
join( "\n",
'sub {',
'if (@_ > 1) {',
'my $clone = ' . $clone . ';',
$attr->inline_set( '$clone', '$_[1]' ),
'return $clone;',
'}',
$attr->inline_get('$_[0]'),
'}' ),
);
confess "Could not generate inline predicate because : $e" if $e;
return $code;
}
}
sub _generate_writer_method_inline {
my $self = shift;
my $attr = $self->associated_attribute;
my $clone
= $attr->associated_class->has_method("clone")
? '$_[0]->clone'
: 'bless { %{$_[0]} }, ref $_[0]';
if ( $Moose::VERSION >= 1.9900 ) {
return try {
$self->_compile_code(
[ 'sub {',
'my $clone = ' . $clone . ';',
$attr->_inline_set_value( '$clone', '$_[1]' ),
'return $clone;', '}',
]
);
}
catch {
confess "Could not generate inline writer because : $_";
};
}
else {
my ( $code, $e ) = $self->_eval_closure(
{},
join( "\n",
'sub {',
'my $clone = ' . $clone . ';',
$attr->inline_set( '$clone', '$_[1]' ),
'return $clone;', '}' ),
);
confess "Could not generate inline writer because : $e" if $e;
return $code;
}
}
1;
__END__
=pod
=head1 NAME
MooseX::Attribute::ChainedClone - Attribute that returns a cloned instance
=head1 VERSION
version 1.0.1
=head1 SYNOPSIS
package Test;
use Moose;
has debug => (
traits => [ 'ChainedClone' ],
is => 'rw',
isa => 'Bool',
default => 0,
);
sub complex_method
{
my $self = shift;
#...
print "helper message" if $self->debug;
#...
}
sub clone {
my $self = shift;
# custom clone code here
# defaults to:
return bless { %$self }, ref $self;
}
1;
Which allows for:
my $test = Test->new;
$test->debug(1)->complex_method; # debug enabled
# complex_method is called on a cloned instance
# with debug set to 1
$test->complex_method; # debug is still disabled on $test
$test->debug(1); # returns a cloned $test instance with debug set to 1
$test->debug; # returns 0
=head1 DESCRIPTION
MooseX::Attribute::ChainedClone is a Moose Trait which allows for method chaining
on accessors by returning a cloned instance of C<$self> on write/set operations.
If C<$self> has a C<clone> method, this method is invoked to clone the instance.
This allows for easy integration with L<MooseX::Clone> or any custom made
clone method. If no C<clone> method is available, the new instance is build
using C<< bless { %$self }, ref $self >>.
=head1 AUTHORS
=over 4
=item *
Moritz Onken <onken@netcubed.de>
=item *
David McLaughlin <david@dmclaughlin.com>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Moritz Onken.
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
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