#!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if $running_under_some_shell;
#!/usr/bin/perl

use strict;
use Getopt::Long;

use JSON::PP ();

my $VERSION = '1.00';

# imported from JSON-XS/bin/json_xs

my %allow_json_opt = map { $_ => 1 } qw(
ascii latin1 utf8 pretty indent space_before space_after relaxed canonical allow_nonref
allow_singlequote allow_barekey allow_bignum loose escape_slash
);


GetOptions(
'v' => \( my $opt_verbose ),
'f=s' => \( my $opt_from = 'json' ),
't=s' => \( my $opt_to = 'json' ),
'json_opt=s' => \( my $json_opt = 'pretty' ),
'V' => \( my $version ),
) or die "Usage: $0 [-v] -f from_format [-t to_format]\n";


if ( $version ) {
print "$VERSION\n";
exit;
}


$json_opt = '' if $json_opt eq '-';

my @json_opt = grep { $allow_json_opt{ $_ } or die "'$_' is invalid json opttion" } split/,/, $json_opt;

my %F = (
'json' => sub {
my $json = JSON::PP->new;
$json->$_() for @json_opt;
$json->decode( $_ );
},
'eval' => sub {
my $v = eval "no strict;\n#line 1 \"input\"\n$_";
die "$@" if $@;
return $v;
},
);


my %T = (
'null' => sub { "" },
'json' => sub {
my $json = JSON::PP->new;
$json->$_() for @json_opt;
$json->encode( $_ );
},
'dumper' => sub {
require Data::Dumper;
Data::Dumper::Dumper($_)
},
);



$F{$opt_from}
or die "$opt_from: not a valid fromformat\n";

$T{$opt_to}
or die "$opt_from: not a valid toformat\n";

local $/;
$_ = <STDIN>;

$_ = $F{$opt_from}->();
$_ = $T{$opt_to}->();

print $_;


__END__

=pod

=encoding utf8

=head1 NAME

json_pp - JSON::PP command utility

=head1 SYNOPSIS

json_pp [-v] [-f from_format] [-t to_format] [-json_opt options_to_json]

=head1 DESCRIPTION

json_pp converts between some input and output formats (one of them is JSON).
This program was copied from L<json_xs> and modified.

The default input format is json and the default output format is json with pretty option.

=head1 OPTIONS

=head2 -f

-f from_format

Reads a data in the given format from STDIN.

Format types:

=over

=item json

as JSON

=item eval

as Perl code

=back

=head2 -t

Writes a data in the given format to STDOUT.

=over

=item null

no action.

=item json

as JSON

=item dumper

as Data::Dumper

=back

=head2 -json_opt

options to JSON::PP

Acceptable options are:

ascii latin1 utf8 pretty indent space_before space_after relaxed canonical allow_nonref
allow_singlequote allow_barekey allow_bignum loose escape_slash

=head2 -v

Verbose option, but currently no action in fact.

=head2 -V

Prints version and exits.


=head1 EXAMPLES

$ perl -e'print q|{"foo":"あい","bar":1234567890000000000000000}|' |\
json_pp -f json -t dumper -json_opt pretty,utf8,allow_bignum

$VAR1 = {
'bar' => bless( {
'value' => [
'0000000',
'0000000',
'5678900',
'1234'
],
'sign' => '+'
}, 'Math::BigInt' ),
'foo' => "\x{3042}\x{3044}"
};

$ perl -e'print q|{"foo":"あい","bar":1234567890000000000000000}|' |\
json_pp -f json -t dumper -json_opt pretty

$VAR1 = {
'bar' => '1234567890000000000000000',
'foo' => "\x{e3}\x{81}\x{82}\x{e3}\x{81}\x{84}"
};

=head1 SEE ALSO

L<JSON::PP>, L<json_xs>

=head1 AUTHOR

Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>


=head1 COPYRIGHT AND LICENSE

Copyright 2010 by Makamaka Hannyaharamitu

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

=cut