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package Hash::Merge::Extra;
use strict;
use warnings FATAL => 'all';
use Hash::Merge qw(_merge_hashes);
our $VERSION = '0.06'; # Don't forget to change in pod below
use constant L_ADDITIVE => {
'SCALAR' => {
'SCALAR' => sub { defined $_[0] ? $_[0] : $_[1] },
'ARRAY' => sub { defined $_[0] ? $_[0] : $_[1] },
'HASH' => sub { defined $_[0] ? $_[0] : $_[1] },
},
'ARRAY' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { [ @{$_[0]}, @{$_[1]} ] },
'HASH' => sub { $_[0] },
},
'HASH' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { _merge_hashes(@_) },
},
};
use constant R_ADDITIVE => {
'SCALAR' => {
'SCALAR' => sub { defined $_[1] ? $_[1] : $_[0] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
'ARRAY' => {
'SCALAR' => sub { defined $_[1] ? $_[1] : $_[0] },
'ARRAY' => sub { [ @{$_[1]}, @{$_[0]} ] },
'HASH' => sub { $_[1] },
},
'HASH' => {
'SCALAR' => sub { defined $_[1] ? $_[1] : $_[0] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { _merge_hashes(@_) },
},
};
use constant L_OVERRIDE => {
'SCALAR' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { $_[0] },
},
'ARRAY' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { $_[0] },
},
'HASH' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { _merge_hashes(@_) },
},
};
use constant R_OVERRIDE => {
'SCALAR' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
'ARRAY' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
'HASH' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { _merge_hashes(@_) },
},
};
use constant L_REPLACE => {
'SCALAR' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { $_[0] },
},
'ARRAY' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { $_[0] },
},
'HASH' => {
'SCALAR' => sub { $_[0] },
'ARRAY' => sub { $_[0] },
'HASH' => sub { $_[0] },
},
};
use constant R_REPLACE => {
'SCALAR' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
'ARRAY' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
'HASH' => {
'SCALAR' => sub { $_[1] },
'ARRAY' => sub { $_[1] },
'HASH' => sub { $_[1] },
},
};
my %INDEX = (
L_ADDITIVE => L_ADDITIVE,
L_OVERRIDE => L_OVERRIDE,
L_REPLACE => L_REPLACE,
R_ADDITIVE => R_ADDITIVE,
R_OVERRIDE => R_OVERRIDE,
R_REPLACE => R_REPLACE,
);
sub import {
shift; # throw off package name
for (@_ ? @_ : keys %INDEX) {
unless (exists $INDEX{$_}) {
require Carp;
Carp::croak "Unable to register $_ (no such behavior)";
}
Hash::Merge::specify_behavior($INDEX{$_}, $_);
}
}
1;
__END__
=head1 NAME
Hash::Merge::Extra - Collection of extra behaviors for L<Hash::Merge>
=begin html
<a href="https://travis-ci.org/mr-mixas/Hash-Merge-Extra.pm"><img src="https://travis-ci.org/mr-mixas/Hash-Merge-Extra.pm.svg?branch=master" alt="Travis CI"/></a>
<a href='https://coveralls.io/github/mr-mixas/Hash-Merge-Extra.pm?branch=master'><img src='https://coveralls.io/repos/github/mr-mixas/Hash-Merge-Extra.pm/badge.svg?branch=master' alt='Coverage Status'/></a>
<a href="https://badge.fury.io/pl/Hash-Merge-Extra"><img src="https://badge.fury.io/pl/Hash-Merge-Extra.svg" alt="CPAN version"/></a>
=end html
=head1 VERSION
Version 0.06
=head1 SYNOPSIS
use Hash::Merge qw(merge);
use Hash::Merge::Extra;
Hash::Merge::set_behavior('R_OVERRIDE');
$result = merge($left, $right);
=head1 EXPORT
Nothing is exported.
All behaviors registered in L<Hash::Merge> if used as
use Hash::Merge::Extra;
Nothing registered if passed empty list:
use Hash::Merge::Extra qw();
Only specified behaviors registered if list defined:
use Hash::Merge::Extra qw(L_OVERRIDE R_REPLACE);
=head1 BEHAVIORS
=over 4
=item B<L_ADDITIVE>, B<R_ADDITIVE>
Hashes merged, arrays joined, undefined scalars overridden. Left and right
precedence.
=item B<L_OVERRIDE>, B<R_OVERRIDE>
Hashes merged, arrays and scalars overridden. Left and right precedence.
=item B<L_REPLACE>, B<R_REPLACE>
Nothing merged. One thing simply replaced by another. Left and right
precedence.
=back
=head1 AUTHOR
Michael Samoglyadov, C<< <mixas at cpan.org> >>
=head1 BUGS
Please report any bugs or feature requests to
L<https://github.com/mr-mixas/Hash-Merge-Extra.pm/issues>
=head1 SEE ALSO
L<Hash::Merge>
=head1 LICENSE AND COPYRIGHT
Copyright 2017,2018 Michael Samoglyadov.
This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.
See L<http://dev.perl.org/licenses/> for more information.
=cut
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