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package MARC::Spec::Indicator;
use Moo;
use Carp qw(croak);
use namespace::clean;
our $VERSION = '2.0.3';
has position => (
is => 'rw',
isa => sub {
croak('For indicator position, only digit "1" or "2" is allowed.')
if($_[0] !~ /1|2/)
},
required => 1
);
has base => (
is => 'rwp',
lazy => 1,
builder => '_base'
);
has subspecs => (
is => 'rwp',
isa => sub {
foreach my $and (@{$_[0]}) {
if(ref $and eq 'ARRAY') {
foreach my $or (@{$and}) {
croak('Subspec is not an instance of MARC::Spec::Subspec.')
if(ref $or ne 'MARC::Spec::Subspec')
}
} else {
croak('Subspec is not an instance of MARC::Spec::Subspec.')
if(ref $and ne 'MARC::Spec::Subspec')
}
}
},
predicate => 1
);
sub BUILDARGS {
my ($class, @args) = @_;
if (@args % 2 == 1) { unshift @args, "position" }
return { @args };
}
sub _base {
my ($self) = @_;
return '^'.$self->position;
}
sub add_subspec {
my ($self, $subspec) = @_;
if(!$self->has_subspecs) {
$self->_set_subspecs([$subspec]);
} else {
my @subspecs = ( @{$self->subspecs}, $subspec );
$self->_set_subspecs( \@subspecs )
}
}
sub add_subspecs {
my ($self, $subspecs) = @_;
if (ref $subspecs ne 'ARRAY') {
croak('Subspecs is not an ARRAYRef!')
}
if(!$self->has_subspecs) {
$self->_set_subspecs($subspecs)
} else {
my @merged = @{$self->subspecs};
push @merged, @{$subspecs};
$self->_set_subspecs( \@merged )
}
}
sub to_string {
my ($self) = @_;
my $string = $self->base;
if($self->has_subspecs) {
my @outer = ();
foreach my $ss (@{$self->subspecs}) {
if(ref $ss eq 'ARRAY') {
my $inner = join '|', map {$_->to_string()} @{$ss};
push @outer, $inner;
} else {
push @outer, $ss->to_string();
}
}
my $joined = join '}{', @outer;
$string .= '{'. $joined .'}';
}
return $string;
}
1;
__END__
=encoding utf-8
=head1 NAME
MARC::Spec::Indicator - indicator specification
=head1 SYNOPSIS
use MARC::Spec::Indicator;
my $indicator = MARC::Spec::Indicator->new('2');
say ref $indicator; # MARC::Spec::Indicator
say $field->position; # 2
=head1 DESCRIPTION
MARC::Spec::Indicator is the indicator specification of a L<MARC::Spec|MARC::Spec>.
See L<MARCspec - A common MARC record path language|http://marcspec.github.io/MARCspec/> for further
details on the syntax.
=head1 METHODS
=head2 new(Str)
Create a new MARC::Spec::Indicator instance. Parameter must be a valid MARCspec indicatorPosition.
=head2 add_subspec(MARC::Spec::Subspec)
Appends a subspec to the array of the attribute subspecs. Parameter must be an instance of
L<MARC::Spec::Subspec|MARC::Spec::Subspec>.
=head2 add_subspecs(ArrayRef[MARC::Spec::Subspec])
Appends subspecs to the array of the attribute subspecs. Parameter must be an ArrayRef and
elements must be instances of L<MARC::Spec::Subspec|MARC::Spec::Subspec>.
=head2 to_string
Returns the spec as a string.
=head1 PREDICATES
=head2 has_position
True if attribute position has an value and false otherwise.
=head2 has_subspecs
Returns true if attribute subspecs has an value and false otherwise.
=head1 ATTRIBUTES
Some attributes are inherited from L<MARC::Spec::Structure|MARC::Spec::Structure>.
=head2 base
Obligatory. Scalar. The base Field spec without subspecs.
=head2 position
Obligatory. The indicator position.
=head2 subspecs
Optional. An array of instances of L<MARC::Spec::Subspec|MARC::Spec::Subspec>, thus all subspecs in this
array MUST be validated as a combination with the boolean 'AND',
and/or an array of arrays (AoA) of instances of L<MARC::Spec::Subspec|MARC::Spec::Subspec>, thus all subspecs
in this AoA must be validated as a combination with the boolean 'OR'.
See L<MARC::Spec::Subspec|MARC::Spec::Subspec> for description of attributes of L<MARC::Spec::Subspec|MARC::Spec::Subspec>.
=head1 AUTHOR
Carsten Klee C<< <klee at cpan.org> >>
=head1 CONTRIBUTORS
=over
=item * Johann Rolschewski, C<< <jorol at cpan> >>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2016 by Carsten Klee.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=head1 BUGS
Please report any bugs to L<https://github.com/MARCspec/MARC-Spec/issues|https://github.com/MARCspec/MARC-Spec/issues>
=head1 SEE ALSO
=over
=item * L<MARC::Spec|MARC::Spec>
=item * L<MARC::Spec::Field|MARC::Spec::Field>
=item * L<MARC::Spec::Subfield|MARC::Spec::Subfield>
=item * L<MARC::Spec::Subspec|MARC::Spec::Subspec>
=item * L<MARC::Spec::Structure|MARC::Spec::Structure>
=item * L<MARC::Spec::Comparisonstring|MARC::Spec::Comparisonstring>
=item * L<MARC::Spec::Parser|MARC::Spec::Parser>
=back
=cut
|
