Hash::Path - A simple way to return a path of HoH

0.02

	 use Hash::Path;

	 my $hash_ref = {
	     key1 => {
	         key2 => {
	             key3 => 'value',
	         },
	     },
	 };

	 my $wanted = Hash::Path->( $hash_ref, qw{key1 key2 key3} );

	 # $wanted contains 'value'

This module was written as proof of concept about how to find data inside a hash of hashes (HoH) with unknown structure. You can think that as hierarchical data like LDAP does, so our path could be the exactly the same as LDAP's dn, but a bit simpler because we (at least at this moment, who knows) don't want to deal with that.

This is a perfect companion for traversing YAML:

	use Hash::Path;
	use YAML;

	my ($hash_ref) = Load(<<'EOF');
	---
	name: john
	permissions:
	  some-module:
	    - read
	    - write
	    - execute
	  another-module:
	    - read
	EOF
	my $permissions = Hash::Path->get($hash_ref, qw(permissions some-module));

	# $permissions contains [ 'read', 'write', 'execute' ]

get

	$scalar = Hash::Path->get($hash_ref, @path);

This is the only available method. It traverses the hash reference using the supplied path array, returning the value as scalar value.

hash_path

        use Hash::Path qw(hash_path);
        $scalar = hash_path($hash_ref, @path);

Now you can export the hash_path function to be a bit shorter. The parameters it takes are the same as get.

Thanks to Arthur Axel "fREW" Schmidt "<FREW@cpan.org>" for using this module and suggesting a better implementation for the get() method.

Copyright (c) 2007, Igor Sutton Lopes "<IZUT@cpan.org>". All rights reserved.

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