void AtomInfoGetPDB3LetHydroName()

in layer2/AtomInfo.cpp [200:507]
307 lines of code
142 McCabe index (conditional complexity)

void AtomInfoGetPDB3LetHydroName(PyMOLGlobals * G, const char *resn, const char *iname, char *oname)
{
  oname[0] = ' ';
  strcpy(oname + 1, iname);

  switch (resn[0]) {
  case 'A':
    switch (resn[1]) {
    case 'L':
      if(resn[2] == 'A')
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
      break;
    case 'R':
      if(resn[2] == 'G')
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G') || (iname[1] == 'D')) &&
           ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
      break;
    case 'S':
      switch (resn[2]) {
      case 'P':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      case 'N':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'C':
    switch (resn[1]) {
    case 'Y':
      switch (resn[2]) {
      case 'S':
      case 'X':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'G':
    switch (resn[1]) {
    case 'L':
      switch (resn[2]) {
      case 'N':
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G')) &&
           ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      case 'U':
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G')) &&
           ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      case 'Y':
        if((iname[0] == 'H') &&
           (iname[1] == 'A') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
    }
    break;
  case 'H':
    switch (resn[1]) {
    case 'I':
      switch (resn[2]) {
      case 'S':
      case 'D':
      case 'E':
      case 'P':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    case 'O':
      switch (resn[2]) {
      case 'H':
        break;
      }
      break;
    case '2':
      switch (resn[2]) {
      case 'O':
        break;
      }
      break;
    }
  case 'I':
    switch (resn[1]) {
    case 'L':
      switch (resn[2]) {
      case 'E':
        break;
      }
    }
    break;
  case 'L':
    switch (resn[1]) {
    case 'E':
      switch (resn[2]) {
      case 'U':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    case 'Y':
      switch (resn[2]) {
      case 'S':
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G') || (iname[1] == 'D')
            || (iname[1] == 'E') || (iname[1] == 'Z')) && ((iname[2] >= '0')
                                                           && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'M':
    switch (resn[1]) {
    case 'E':
      switch (resn[2]) {
      case 'T':
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G') || (iname[1] == 'E')) &&
           ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
    }
    break;
  case 'P':
    switch (resn[1]) {
    case 'H':
      switch (resn[2]) {
      case 'E':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    case 'R':
      switch (resn[2]) {
      case 'O':
        if((iname[0] == 'H') &&
           ((iname[1] == 'B') || (iname[1] == 'G') || (iname[1] == 'D')) &&
           ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'S':
    switch (resn[1]) {
    case 'E':
      switch (resn[2]) {
      case 'R':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'T':
    switch (resn[1]) {
    case 'H':
      switch (resn[2]) {
      case 'R':
        break;
      }
      break;
    case 'I':
      switch (resn[2]) {
      case 'P':
        break;
      }
      break;
    case 'R':
      switch (resn[2]) {
      case 'P':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    case 'Y':
      switch (resn[2]) {
      case 'R':
        if((iname[0] == 'H') &&
           (iname[1] == 'B') && ((iname[2] >= '0') && (iname[2] <= '9'))) {
          oname[0] = iname[2];
          oname[1] = iname[0];
          oname[2] = iname[1];
          oname[3] = 0;
        }
        break;
      }
      break;
    }
    break;
  case 'V':
    switch (resn[1]) {
    case 'A':
      switch (resn[2]) {
      case 'L':
        break;
      }
      break;
    }
    break;
  case 'W':
    switch (resn[1]) {
    case 'A':
      switch (resn[2]) {
      case 'T':
        break;
      }
      break;
    }
    break;
  }
}