docs: def Scripts(unicode_dir=_UNICODE_DIR):
    """Returns dict mapping script names to code lists.
  
    Args:
      unicode_dir: Unicode data directory
  
    Returns:
      dict mapping script names to code lists
    """
  
    scripts = {}
  
    def DoLine(codes, fields):
      """Process single Scripts.txt line, updating scripts."""
      (_, name) = fields
      scripts.setdefault(name, []).extend(codes)
  
    ReadUnicodeTable(unicode_dir+"/Scripts.txt", 2, DoLine)
    return scripts