use base qw(Exporter);
use strict;
use Error::Pure qw(err);
Readonly::Array our @EXPORT_OK => qw(obj2struct struct2obj);
our $VERSION = 0.14;
sub obj2struct {
my ($obj, $base_uri) = @_;
if (! defined $obj) {
err "Object doesn't exist.";
}
if (! $obj->isa('Wikibase::Datatype::Snak')) {
err "Object isn't 'Wikibase::Datatype::Snak'.";
}
if (! defined $base_uri) {
err 'Base URI is required.';
}
my $struct_hr = {
defined $obj->datavalue
? ('datavalue' => Wikibase::Datatype::Struct::Value::obj2struct($obj->datavalue, $base_uri))
: (),
'datatype' => $obj->datatype,
'property' => $obj->property,
'snaktype' => $obj->snaktype,
};
return $struct_hr;
}
sub struct2obj {
my $struct_hr = shift;
# Data value isn't required for snaktype 'novalue'.
my $datavalue;
if (exists $struct_hr->{'datavalue'}) {
$datavalue = Wikibase::Datatype::Struct::Value::struct2obj($struct_hr->{'datavalue'});
}
my $obj = Wikibase::Datatype::Snak->new(
'datavalue' => $datavalue,
'datatype' => $struct_hr->{'datatype'},
'property' => $struct_hr->{'property'},
'snaktype' => $struct_hr->{'snaktype'},
);
return $obj;
}
1;
__END__
=pod
=encoding utf8
=head1 NAME
Wikibase::Datatype::Struct::Snak - Wikibase snak structure serialization.
=head1 SYNOPSIS
use Wikibase::Datatype::Struct::Snak qw(obj2struct struct2obj);
my $struct_hr = obj2struct($obj, $base_uri);
my $obj = struct2obj($struct_hr);
=head1 DESCRIPTION
This conversion is between objects defined in Wikibase::Datatype and structures
serialized via JSON to MediaWiki.
=head1 SUBROUTINES
=head2 C<obj2struct>
my $struct_hr = obj2struct($obj, $base_uri);
Convert Wikibase::Datatype::Snak instance to structure.
C<$base_uri> is base URI of Wikibase system (e.g. http://test.wikidata.org/entity/).
Returns reference to hash with structure.
=head2 C<struct2obj>
my $obj = struct2obj($struct_hr);
Convert structure of snak to object.
Returns Wikibase::Datatype::Snak instance.
=head1 ERRORS
obj2struct():
Base URI is required.
Object doesn't exist.
Object isn't 'Wikibase::Datatype::Snak'.
=head1 EXAMPLE1
=for comment filename=obj2struct_snak.pl
use strict;
use warnings;
use Data::Printer;
use Wikibase::Datatype::Snak;
use Wikibase::Datatype::Struct::Snak qw(obj2struct);
use Wikibase::Datatype::Value::Item;
# Object.
# instance of (P31) human (Q5)
my $obj = Wikibase::Datatype::Snak->new(
'datatype' => 'wikibase-item',
'datavalue' => Wikibase::Datatype::Value::Item->new(
'value' => 'Q5',
),
'property' => 'P31',
);
# Get structure.
my $struct_hr = obj2struct($obj, 'http://test.wikidata.org/entity/');
# Dump to output.
p $struct_hr;
# Output:
# \ {
# datatype "wikibase-item",
# datavalue {
# type "wikibase-entityid",
# value {
# entity-type "item",
# id "Q5",
# numeric-id 5
# }
# },
# property "P31",
# snaktype "value"
# }
=head1 EXAMPLE2
=for comment filename=struct2obj_snak.pl
use strict;
use warnings;
use Wikibase::Datatype::Struct::Snak qw(struct2obj);
# Item structure.
my $struct_hr = {
'datatype' => 'wikibase-item',
'datavalue' => {
'type' => 'wikibase-entityid',
'value' => {
'entity-type' => 'item',
'id' => 'Q5',
'numeric-id' => 5,
},
},
'property' => 'P31',
'snaktype' => 'value',
};
# Get object.
my $obj = struct2obj($struct_hr);
# Get value.
my $datavalue = $obj->datavalue->value;
# Get datatype.
my $datatype = $obj->datatype;
# Get property.
my $property = $obj->property;
# Print out.
print "Property: $property\n";
print "Type: $datatype\n";
print "Value: $datavalue\n";
# Output:
# Property: P31
# Type: wikibase-item
# Value: Q5
=head1 DEPENDENCIES
L<Error::Pure>,
L<Exporter>,
L<Readonly>,
L<Wikibase::Datatype::Snak>,
L<Wikibase::Datatype::Struct::Value>.
=head1 SEE ALSO
=over
=item L<Wikibase::Datatype::Struct>
Wikibase structure serialization.
=item L<Wikibase::Datatype::Snak>
Wikibase snak datatype.
=back
=head1 REPOSITORY
=head1 AUTHOR
Michal Josef Špaček L<mailto:skim@cpan.org>
=head1 LICENSE AND COPYRIGHT
© 2020-2025 Michal Josef Špaček
BSD 2-Clause License
=head1 VERSION
0.14
=cut