Function expand_ellipses

fem/tensorcoefficient.cpp:359–382

        }

        string expand_ellipses(const string& signature, const Array<shared_ptr<CoefficientFunction>>& cfs)
        {
          auto parts = split_signature(signature);
          if (parts.size() - 1 != cfs.Size())
              throw NG_EXCEPTION(
                  string("number of inputs (") + to_string(cfs.Size()) + ") " +
                  "does not match the number inferred from the signature ("
                  + to_string(parts.size() - 1) + ")");

          string ellipse_symbols{};
          ellipse_symbols.reserve(10);
          for (auto i : Range(parts.size() - 1))
            tie(parts[i], ellipse_symbols) = expand_ellipse(parts[i], cfs[i], signature, ellipse_symbols);

          auto pos = parts.back().find("...");
          if (pos != string::npos)
            parts.back() = replace_ellipse(parts.back(), pos, ellipse_symbols.size(), ellipse_symbols);

          for (const auto& part : parts)
            if (part.find("...") != string::npos)
              throw NG_EXCEPTION(string("could not expand all ellipses in signature ") + signature);

          return form_index_signature(parts);
        }

        optional<string> substitute_id_index(string signature, pair<char, char> id_indices,
                                 size_t id_pos, const FlatArray<bool> marked_for_removal,