http://www.perlmonks.org?node_id=1045545

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

anyone seen a sortkeys (like Data::Dumper->new->Sortkeys() ) for Data::Dump?

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Re: sortkeys for Data::Dump
by rjt (Curate) on Jul 22, 2013 at 00:04 UTC

    There is no analogous method, because Data::Dump sorts the keys by default. (Confirmed by inspection of Data/Dump.pm.)

    #!/usr/bin/env perl

use 5.012;
use warnings;

use Data::Dump qw/dump/;
my $data = {
    key1 => 'foo',
    key2 => 3,
    key0 => 'bar',
};
dump $data;

    [download]

    Output:

    { key0 => "bar", key1 => "foo", key2 => 3 }

    [download]

    If you need to customize the sort subroutine, however, you will need to hook into Data::Dump::Filtered. You did not specify which usage you need, but you supplied empty arguments to Sortkeys() in your OP, so I'll assume the former for now.

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[d/l]
[select]

      ...

      Thanks, I know :)

      ... hook ...

      I don't think so, I think a patch is in order, but I give up

      Read more... (2 kB)
[reply]
[d/l]

        ... hook ...

        I don't think so

        Have a little faith. :-)

        Easily extendable to support arbitrary sort subs, or even context-sensitive sorts.

        my $dump = dumpf($data, sub {
    use List::Util qw/max/;
    my ($ctx, $obj) = @_;

    my %r;
    state %seen;

    if ('HASH' eq ref $obj and not $seen{$obj}++) {
        no warnings 'uninitialized'; # Unknown sort keys
        my $len = max map { length } keys $obj; # Keep results aligned
        my $sort_string =  'a' x max map { length } keys $obj;

        # Convert existing keys to ...aaaaa, ...aaaab, ...aaaac, etc.,
        # so Data::Dump's lexical sort works.
        my %keymap =  map { $sort_string++  => $_ }
                     sort { $num{$a} <=> $num{$b} } keys $obj;
        $obj->{$_} = delete $obj->{$keymap{$_}} for keys %keymap;

        my $dump = Data::Dump::dump($obj);

        # Replace to get original keys back
        $dump =~ s/$_/sprintf "%-${len}s",$keymap{$_}/e for keys %keym
+ap;
        $r{dump} = $dump;
    }
    return \%r;
});

        [download]

        Full example

        Read more... (2 kB)

        Output:

        {
  unknown => "unknown key",
  one     => "first",
  two     => {
               one   => "the",
               six   => "inner",
               seven => "hash",
               eight => "works",
               nine  => "too",
             },
  three   => "third",
}

        [download]
        I think a patch is in order,

        Not a bad idea, either.

[reply]
[d/l]
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