Perl反序列化XML

#!/usr/bin/perl 

use strict;
use warnings;

use XML::Twig;
use Test::More tests => 1;

my $expected= {
    my_id => -31,
    login => \"root\",
    ip_list => [
        { user_ip => \"0.0.0.0\",
          user_mask => \"0.0.0.0\"
        },
        { user_ip => \"94.230.160.230\",
          user_mask => \"255.255.255.0\"
        }
    ],
    modules => [
        { module_name => \"core\" },
        { module_name => \"devices\" }
    ],
    addition_modules => []
};

my $data={};

my $t=XML::Twig->new( twig_handlers => { \'integer[@name=\"my_id\"]\' => sub { add_field( $data, $_)},
                                         \'string[@name=\"login\"]\' => sub { add_field( $data, $_)},
                                         array => sub { array( $data, @_); },
                                       },
              )
         ->parse( \\*DATA); # replace with parsefile( \'file.xml\') to parse a file

is_deeply( $data, $expected, \'one test to rule them all\');


sub array
  { my( $data, $t, $array)= @_;
    my $name= $array->prev_sibling( \'integer\')->att( \'name\');
    $data->{$name}=[];
    foreach my $item ($array->children( \'item\'))
      { my $item_data={};
        foreach my $child ($item->children)
          { add_field( $item_data, $child); }
        push @{$data->{$name}}, $item_data;
      }
  }


# get a name/value pair of attributes and add it to a hash, which
# could be the overall $data or an element in an array
sub add_field
  { my( $data, $elt)= @_;
    $data->{$elt->att( \'name\')}= $elt->att( \'value\');
  }



__DATA__
<data>
    <call function=\"get_user_data\">
        <output>
            <integer name=\"my_id\" value=\"-31\" />
            <string name=\"login\" value=\"root\" />
            <integer name=\"ip_list\" value=\"2\" />
            <array name=\"i\">
                <item>
                    <ip_address name=\"user_ip\" value=\"0.0.0.0\" />
                    <ip_address name=\"user_mask\" value=\"0.0.0.0\"/>
                </item>
                <item>
                    <ip_address name=\"user_ip\" value=\"94.230.160.230\" />
                    <ip_address name=\"user_mask\" value=\"255.255.255.0\"/>
                </item>
            </array>
            <integer name=\"modules\" value=\"2\" />
            <array name=\"i\">
                <item>
                    <string name=\"module_name\" value=\"core\" />
                </item>
                <item>
                    <string name=\"module_name\" value=\"devices\" />
                </item>
            </array>
            <integer name=\"addition_modules\" value=\"0\"/>
            <array name=\"i\"/>
        </output>
    </call>
</data>