sub get_asp_blocks {
    my($file) = @_;
    open(FILE, $file) or die "can't open '$file': $!\n";

    my @blocks = ( ["HTM", ""] );
    my $state = "HTM";
    my $last;
    while(read(FILE, $char, 1)) {
        if($last eq "<" && $char eq "%" && $state eq "HTM") {
            chop $blocks[-1][1];
            $state = "ASP";
            push(@blocks, ["ASP", ""]);
        } elsif($last eq "%" && $char eq ">" && $state eq "ASP") {
            chop $blocks[-1][1];
            $state = "HTM";
            push(@blocks,  ["HTM", ""]);
        } else {
            $blocks[-1][1] .= $char;
        }
        $last = $char;
    }
    close(FILE);
    return @blocks;
}