Add Cce Tags (shared with PR sxs-collaboration#1397)

src/Evolution/Systems/Cce/Tags.hpp

@@ -7,6 +7,7 @@
 #include "DataStructures/SpinWeighted.hpp"
 #include "DataStructures/Tensor/Tensor.hpp"
 #include "DataStructures/Tensor/TypeAliases.hpp"
+#include "NumericalAlgorithms/Spectral/SwshTags.hpp"
 
 namespace Cce {
 
@@ -49,6 +50,11 @@ struct K : db::SimpleTag {
   static std::string name() noexcept { return "K"; }
 };
 
+struct LMax : db::SimpleTag {
+  using type = size_t;
+  static std::string name() noexcept { return "l_max";}
+};
+
 /// Bondi parameter \f$Q\f$
 struct Q : db::SimpleTag {
   using type = Scalar<SpinWeighted<ComplexDataVector, 1>>;
@@ -85,10 +91,17 @@ struct Dy : db::PrefixTag, db::SimpleTag {
   using type = Scalar<SpinWeighted<ComplexDataVector, Tag::type::type::spin>>;
   using tag = Tag;
   static const size_t dimension_to_differentiate = 2;
-  static const size_t dim = 3;
   static std::string name() noexcept { return "Dy(" + Tag::name() + ")"; }
 };
 
+/// The derivative with respect to Bondi \f$r\f$
+template <typename Tag>
+struct Dr : db::PrefixTag, db::SimpleTag {
+  using type = Scalar<SpinWeighted<ComplexDataVector, Tag::type::type::spin>>;
+  using tag = Tag;
+  static std::string name() noexcept { return "Dr(" + Tag::name() + ")"; }
+};
+
 // prefix tags associated with the integrands which are used as input to solvers
 // for the CCE equations
 
@@ -205,20 +218,26 @@ struct DuRDividedByR : db::SimpleTag {
 /// the shape of the initial worldtube data.
 struct EthRDividedByR : db::SimpleTag {
   using type = Scalar<SpinWeighted<ComplexDataVector, 1>>;
+  using derivative_kind = Spectral::Swsh::Tags::Eth;
+  static constexpr int spin = 1;
   static std::string name() noexcept { return "EthRDividedByR"; }
 };
 
 /// The value \f$\eth \eth R / R\f$, where \f$R\f$ is the variable associated
 /// with the shape of the initial worldtube data.
 struct EthEthRDividedByR : db::SimpleTag {
   using type = Scalar<SpinWeighted<ComplexDataVector, 2>>;
+  using derivative_kind = Spectral::Swsh::Tags::EthEth;
+  static constexpr int spin = 2;
   static std::string name() noexcept { return "EthEthRDividedByR"; }
 };
 
 /// The value \f$\eth \bar{\eth} R / R\f$, where \f$R\f$ is the variable
 /// associated with the shape of the initial worldtube data.
 struct EthEthbarRDividedByR : db::SimpleTag {
   using type = Scalar<SpinWeighted<ComplexDataVector, 0>>;
+  using derivative_kind = Spectral::Swsh::Tags::EthEthbar;
+  static constexpr int spin = 0;
   static std::string name() noexcept { return "EthEthbarRDividedByR"; }
 };