#!/usr/bin/perl
use strict;
use HTML::Template;
use Data::Dumper;
my $template = "
";
my $tree = [
{ 'value' => 'a', 'depth' => 1 },
{ 'value' => 'b', 'depth' => 1 },
{ 'value' => 'b1', 'depth' => 2 },
{ 'value' => 'b2', 'depth' => 2 },
{ 'value' => 'c', 'depth' => 1 },
{ 'value' => 'c1', 'depth' => 2 },
{ 'value' => 'c1.1', 'depth' => 3 },
{ 'value' => 'd', 'depth' => 1 }
];
for my $i (0 .. $#$tree) {
if (defined $tree->[$i+1]) {
my $diff = $tree->[$i+1]->{depth} - $tree->[$i]->{depth};
if ($diff > 0) {
$tree->[$i]->{up} = [({}) x $diff];
} elsif ( $diff < 0 ) {
$tree->[$i]->{down} = [({}) x -$diff];
}
}
}
my $html_template = HTML::Template->new(
scalarref => \$template,
loop_context_vars => 1);
$html_template->param('tree' => $tree);
print $html_template->output;