docs: def _tokenize_latex(self, exp):
          """
          Internal method to tokenize latex
          """
          tokens = []
          prevexp = ""
          while exp:
              t, exp = self._get_next_token(exp)
              if t.strip() != "":
                  tokens.append(t)
              if prevexp == exp:
                  break
              prevexp = exp
          return tokens