Ahh. didn't realize how they had to nest. Here is a slightly updated version that passes W3C validation. I assume/hope that means IE will like it.
#!/usr/bin/perl
use strict;
use HTML::Template;
use Data::Dumper;
my $template = "
<ul>
<TMPL_LOOP tree>
<li><TMPL_VAR value> (depth=<TMPL_VAR depth>)
<TMPL_UNLESS up></li></TMPL_UNLESS>
<TMPL_LOOP up><ul></TMPL_LOOP>
<TMPL_LOOP down></ul></li></TMPL_LOOP>
</TMPL_LOOP>
</ul>
";
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;
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