#!/usr/local/bin/perl -w

eval 'exec /usr/local/bin/perl -w -S $0 ${1+"$@"}'
    if 0; # not running under some shell
use strict;

my %encode = (
	'<' => '&lt;',
	'&' => '&amp;',
	'"' => '&quot;',
);

my $encode = join('', keys(%encode));

my $tag_open;

while(<>) {
	chomp;
	my ($type, $value) = m/\A([A()?-])(.*)\Z/;

	if ($type eq 'A') {
		my ($att, $attval) = m/\AA([^\s]+)\s*(.*)\Z/;
		print " $att=\"" , encode($attval) , '"';
		next;
	}

	print '>' if $tag_open;
	undef $tag_open;

	if ($type eq '(') {
		print "<$value";
		$tag_open = 1;
	}
	elsif ($type eq ')') {
		print "</$value>";
	}
	elsif ($type eq '-') {
		$value =~ s/\\n/\n/g;
		print encode($value);
	}
	elsif ($type eq '?') {
		print "<?" , encode($value) , "?>";
	}
}

print '>' if $tag_open;

sub encode {
	my $text = shift;
	$text =~ s/([$encode])/$encode{$1}/g;
	return $text;
}