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#! /usr/bin/perl
use strict;
use warnings;
use HTML::TreeBuilder;
sub find_elements_by_tag_names($@)
{
my ($elem, @tagnames) = @_;
if (ref($elem) ne 'HTML::TreeBuilder' && ref($elem) ne 'HTML::Element') {
die('Invalid argument to find_elements_by_tag_names');
}
my @list = $elem->content_list();
my $tag;
my @retlist = ();
foreach (@list) {
if (ref($_) ne 'HTML::Element') {
next;
}
$tag = $_->tag();
if (grep($_ eq $tag, @tagnames)) {
push(@retlist, $_);
}
}
return @retlist;
}
sub number_sections($)
{
my ($doc) = @_;
# my $doc = shift;
if (ref($doc) ne 'HTML::TreeBuilder') {
die('Invalid argument to number_sections');
}
my @body = find_elements_by_tag_names($doc, ('body'));
my @headers = find_elements_by_tag_names($body[0],
('h1', 'h2', 'h3', 'h4', 'h5', 'h6'));
my @secnums = (0, 0, 0, 0, 0, 0);
my $curlev = -1;
my $newlev;
my $secstr;
foreach (@headers) {
$newlev = $_->tag();
$newlev =~ s/^h(\d)$/$1/;
if ($newlev != $curlev) {
foreach (@secnums[$newlev .. $#secnums]) {
$_ = 0;
}
}
++$secnums[$newlev - 1];
$secstr = join('.', @secnums);
$secstr =~ s/(\.0)*$//;
print($secstr, ":\t\"", $_->content_list(), "\"\n");
$curlev = $newlev;
}
}
sub main()
{
my $doc = HTML::TreeBuilder->new();
while (<>) {
$doc->parse($_);
}
number_sections($doc);
}
main();
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