Class LineStyleIndexConverter

src/laybasic/laybasic/layLayerProperties.cc:1769–1801

* @brief A helper class for XML parser: convert a style string to a integer index and vice versa */

 *  @brief A helper class for XML parser: convert a style string to a integer index and vice versa
 */
struct LineStyleIndexConverter
{
  std::string to_string (int b) const
  {
    if (b < 0) {
      return "";
    } else if (b < std::distance (lay::LineStyles::default_style ().begin (), lay::LineStyles::default_style ().begin_custom ())) {
      //  intrinsic pattern
      return "I" + tl::to_string (b);
    } else {
      //  custom pattern
      return "C" + tl::to_string (b - std::distance (lay::LineStyles::default_style ().begin (), lay::LineStyles::default_style ().begin_custom ()));
    }
  }

  void from_string (const std::string &s, int &b) const
  {
    if (s.empty ()) {
      b = -1;
    } else if (s[0] == 'I') {
      tl::from_string (s.c_str () + 1, b);
    } else if (s[0] == 'C') {
      tl::from_string (s.c_str () + 1, b);
      b = b + std::distance (lay::LineStyles::default_style ().begin (), lay::LineStyles::default_style ().begin_custom ());
    } else {
      tl::from_string (s, b);
      if (b >= 16) {
        //  backward compatibility to older versions
        b = b - 16 + std::distance (lay::LineStyles::default_style ().begin (), lay::LineStyles::default_style ().begin_custom ());
      }
    }
  }
};

static const tl::XMLElementList layer_element = tl::XMLElementList (
  //  HINT: these make_member calls want to be qualified: otherwise an internal error