#!/usr/bin/env perl

# ===========================================================================
#
#                            PUBLIC DOMAIN NOTICE
#            National Center for Biotechnology Information (NCBI)
#
#  This software/database is a "United States Government Work" under the
#  terms of the United States Copyright Act.  It was written as part of
#  the author's official duties as a United States Government employee and
#  thus cannot be copyrighted.  This software/database is freely available
#  to the public for use. The National Library of Medicine and the U.S.
#  Government do not place any restriction on its use or reproduction.
#  We would, however, appreciate having the NCBI and the author cited in
#  any work or product based on this material.
#
#  Although all reasonable efforts have been taken to ensure the accuracy
#  and reliability of the software and data, the NLM and the U.S.
#  Government do not and cannot warrant the performance or results that
#  may be obtained by using this software or data. The NLM and the U.S.
#  Government disclaim all warranties, express or implied, including
#  warranties of performance, merchantability or fitness for any particular
#  purpose.
#
# ===========================================================================
#
# File Name:  xml2json
#
# Author:  Jonathan Kans
#
# Version Creation Date:   11/09/2020
#
# ==========================================================================

# Entrez Direct legacy support for xml to json, extracted from edirect.pl

# use strict;
use warnings;

# usage - xml2json

use JSON::PP;
use XML::Simple;

# definitions

use constant false => 0;
use constant true  => 1;

sub convert_bools {
    my %unrecognized;

    local *_convert_bools = sub {
        my $ref_type = ref($_[0]);
        if (!$ref_type) {
            # Nothing.
        }
        elsif ($ref_type eq 'HASH') {
            _convert_bools($_) for values(%{ $_[0] });
        }
        elsif ($ref_type eq 'ARRAY') {
            _convert_bools($_) for @{ $_[0] };
        }
        elsif (
               $ref_type eq 'JSON::PP::Boolean'           # JSON::PP
            || $ref_type eq 'Types::Serialiser::Boolean'  # JSON::XS
        ) {
            $_[0] = $_[0] ? 1 : 0;
        }
        else {
            ++$unrecognized{$ref_type};
        }
    };

    &_convert_bools;
}

sub xml_to_json {

  my $data = shift (@_);

  my $xc = new XML::Simple(KeepRoot => 1);
  my $conv = $xc->XMLin($data);
  convert_bools($conv);
  my $jc = JSON::PP->new->ascii->pretty->allow_nonref;
  $data = $jc->encode($conv);

  return $data;
}

# main block

my $str = do { local $/; <STDIN> };

$data = xml_to_json($str);

print $data;

# close input and output files

close (STDIN);
close (STDOUT);
close (STDERR);