use URI::file;
my $base_uri = URI::file->new( URI::file->cwd );

while (my $path = <DATA>) {
  chomp($path);
  my $absolute = URI::file->new_abs( $path, $base_uri );
  printf "%s + %s: %s\n", $base_uri->canonical, $path, $absolute->file;
}

__DATA__
../another/
subdir/
../../../some/other/place
../project/