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Re: Manipulate deepest values in complex hash structures

by hdb (Prior)
on Apr 29, 2013 at 20:48 UTC ( #1031284=note: print w/ replies, xml ) Need Help??


in reply to Manipulate deepest values in complex hash structures

One method is to use recursion in combination with dispatch tables:

use strict; use warnings; my %dispatch = ( # scalar '' => sub { my ( $element, $op ) = @_; $op->( $element ); }, 'HASH' => sub { my ( $element, $op ) = @_; for my $key (keys %{$element}) { search_and_replace_in_hash( $element->{$key}, $op ); } }, 'ARRAY' => sub { my ( $element, $op ) = @_; search_and_replace_in_hash( $_, $op) for @{$element}; }, 'default' => sub { my ( $element, $op ) = @_; print STDERR ref($element).": unknown type of reference\ +n" }, ); # operates on references sub search_and_replace_in_hash { &{ $dispatch{ ref($_[0]) } // $dispatch{'default'} }(@_); } my $var = { "0x55555555" => { "0x55555555" => [ ["0xAAAAAAAA", "0x9"], + ], "0xAAAAAAAA" => [ ["0xAAAAAAAA", "0x8"], ], }, "0xAAAAAAAA" => { "0x55555555" => [ ["0xFFFFFFFF", "0x8"], ], "0xAAAAAAAA" => [ ["0x55555554", "0x3"], ], }, }; search_and_replace_in_hash( $var, sub { $_ =~ s/0x//; } ); search_and_replace_in_hash( $var, sub { print "$_\n"; } ); # no need f +or Data::Dumper

For other types of references, you need to expand the dispatch table accordingly.

Thanks to Rolf for his helpful comments above.


Comment on Re: Manipulate deepest values in complex hash structures
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Re^2: Manipulate deepest values in complex hash structures
by RecursionBane (Sexton) on Apr 29, 2013 at 21:00 UTC
    Thank you, hdb! This is the first time I'm seeing dispatch tables; that's really neat!

    ~RecursionBane

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