Method PostVisitSelect

eval/compiler/flat_expr_builder.cc:948–986

Select node handler. Invoked after child nodes are processed.

  // Select node handler.
  // Invoked after child nodes are processed.
  void PostVisitSelect(const cel::Expr& expr,
                       const cel::SelectExpr& select_expr) override {
    if (!progress_status_.ok()) {
      return;
    }

    // Check if we are "in the middle" of namespaced name.
    // This is currently enum specific. Constant expression that corresponds
    // to resolved enum value has been already created, thus preceding chain
    // of selects is no longer relevant.
    if (resolved_select_expr_) {
      if (&expr == resolved_select_expr_) {
        resolved_select_expr_ = nullptr;
      }
      return;
    }

    if (auto depth = RecursionEligible(); depth.has_value()) {
      auto deps = ExtractRecursiveDependencies();
      if (deps.size() != 1) {
        SetProgressStatusError(absl::InternalError(
            "unexpected number of dependencies for select operation."));
        return;
      }
      StringValue field = cel::StringValue(select_expr.field());

      SetRecursiveStep(
          CreateDirectSelectStep(std::move(deps[0]), std::move(field),
                                 select_expr.test_only(), expr.id(),
                                 options_.enable_empty_wrapper_null_unboxing,
                                 enable_optional_types_),
          *depth + 1);
      return;
    }

    AddStep(CreateSelectStep(select_expr, expr.id(),
                             options_.enable_empty_wrapper_null_unboxing,
                             enable_optional_types_));
  }

  // Call node handler group.
  // We provide finer granularity for Call node callbacks to allow special