use strict;

package HTML::FormFu::Constraint::JSON;
# ABSTRACT: Valid JSON string
$HTML::FormFu::Constraint::JSON::VERSION = '2.07';
use JSON::MaybeXS qw( decode_json );
use Moose;

extends 'HTML::FormFu::Constraint';

sub constrain_value {
    my ( $self, $value ) = @_;

    return 1 if !defined $value || $value eq '';

    my $ok = decode_json($value);

    return $self->not ? !$ok : $ok;
}

__PACKAGE__->meta->make_immutable;

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

HTML::FormFu::Constraint::JSON - Valid JSON string

=head1 VERSION

version 2.07

=head1 DESCRIPTION

Checks for valid JSON string

=head1 SEE ALSO

Is a sub-class of, and inherits methods from L<HTML::FormFu::Constraint>

L<HTML::FormFu>

=head1 AUTHOR

Carl Franks C<cfranks@cpan.org>

=head1 LICENSE

This library is free software, you can redistribute it and/or modify it under
the same terms as Perl itself.

=head1 AUTHOR

Carl Franks <cpan@fireartist.com>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2018 by Carl Franks.

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