code: def p_current_col(self):
          "Return currnet column in line"
          prefix = self.input[:self.pos]
          nlidx = prefix.rfind('\n')
          if nlidx == -1:
              return self.pos
          return self.pos - nlidf p_current_col(self):
          "Return currnet column in line"
          prefix = self.input[:self.pos]
          nlidx = prefix.rfind('\n')
          if nlidx == -1:
              return self.pos
          return self.pos - nlidx
docs: Return currnet column in line