Method parse_scalar_expr

plugins/experimental/txn_box/plugin/src/Config.cc:375–402

}

Rv<Expr>
Config::parse_scalar_expr(YAML::Node node)
{
  Rv<Expr> zret;
  TextView text{node.Scalar()};
  if (node.IsNull()) {
    return Expr{};
  } else if (node.Tag() == "?"_tv) { // unquoted, must be extractor.
    zret = this->parse_unquoted_expr(text);
  } else {
    zret = this->parse_composite_expr(text);
  }

  if (zret.is_ok()) {
    auto &expr = zret.result();
    if (expr._max_arg_idx >= 0) {
      if (_active_capture._count == 0) {
        return Errata(S_ERROR, R"(Regular expression capture group used at {} but no regular expression is active.)", node.Mark());
      } else if (expr._max_arg_idx >= int(_active_capture._count)) {
        return Errata(
          S_ERROR,
          R"(Regular expression capture group {} used at {} but the maximum capture group is {} in the active regular expression from line {}.)",
          expr._max_arg_idx, node.Mark(), _active_capture._count - 1, _active_capture._line);
      }
    }
  }
  return zret;
}

Rv<Expr>
Config::parse_expr_with_mods(YAML::Node node)