Method operator()

eval/public/ast_rewrite.cc:131–150

struct PreVisitor {
  void operator()(const ExprRecord& record) {
    Expr* expr = record.expr;
    const SourcePosition position(expr->id(), record.source_info);
    visitor->PreVisitExpr(expr, &position);
    switch (expr->expr_kind_case()) {
      case Expr::kSelectExpr:
        visitor->PreVisitSelect(&expr->select_expr(), expr, &position);
        break;
      case Expr::kCallExpr:
        visitor->PreVisitCall(&expr->call_expr(), expr, &position);
        break;
      case Expr::kComprehensionExpr:
        visitor->PreVisitComprehension(&expr->comprehension_expr(), expr,
                                       &position);
        break;
      default:
        // No pre-visit action.
        break;
    }
  }

  // Do nothing for Arg variant.
  void operator()(const ArgRecord&) {}