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Re: Printing a hash in a specific order?

by thpfft (Chaplain)
on Mar 15, 2003 at 18:30 UTC ( #243330=note: print w/replies, xml ) Need Help??

in reply to Printing a hash in a specific order?

If you just want the output to look tidy, or to be ordered in a predictable way, then a reasonably simple lexical sort will probably serve. That will get you as far as putting all the alias-* fields next to each other, but if your goal is to make the information human-friendly - ie ordered in an arbitrary way - then the answer will have to be a form of template.

You could consider a full templating system like the Template Toolkit - the initial investment of time would almost certainly pay off later - but for your present requirements all you need is a sort of master sequence that will serve as a guide:

key type flags Alias-.* Full Name Post Office Description ... Building-.* owner

Then you just step through the template dropping the right data into your output string in response to each line. Implementing the wildcards will be a bit tricky, but you could use something like the following wildly untested bit of pseudo-perl to obey regexes in the template:

my $output; while (<template>) { chomp; for (grep { /$_/ } keys %{ $data{$key} }) { $output .= "$_: " . $data{$key}{$_} . "\n"; } }

which would of course be bristling with taint- and sanity-checks before it made it out into the world :)

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