| // Copyright 2020 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef SRC_TINT_AST_ATTRIBUTE_H_ |
| #define SRC_TINT_AST_ATTRIBUTE_H_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "src/tint/ast/node.h" |
| |
| namespace tint::ast { |
| |
| /// The base class for all attributes |
| class Attribute : public Castable<Attribute, Node> { |
| public: |
| ~Attribute() override; |
| |
| /// @returns the WGSL name for the attribute |
| virtual std::string Name() const = 0; |
| |
| protected: |
| /// Constructor |
| /// @param pid the identifier of the program that owns this node |
| /// @param nid the unique node identifier |
| /// @param src the source of this node |
| Attribute(ProgramID pid, NodeID nid, const Source& src) : Base(pid, nid, src) {} |
| }; |
| |
| /// A list of attributes |
| using AttributeList = std::vector<const Attribute*>; |
| |
| /// @param attributes the list of attributes to search |
| /// @returns true if `attributes` includes a attribute of type `T` |
| template <typename... Ts> |
| bool HasAttribute(const AttributeList& attributes) { |
| for (auto* attr : attributes) { |
| if (attr->IsAnyOf<Ts...>()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /// @param attributes the list of attributes to search |
| /// @returns a pointer to `T` from `attributes` if found, otherwise nullptr. |
| template <typename T> |
| const T* GetAttribute(const AttributeList& attributes) { |
| for (auto* attr : attributes) { |
| if (attr->Is<T>()) { |
| return attr->As<T>(); |
| } |
| } |
| return nullptr; |
| } |
| |
| } // namespace tint::ast |
| |
| #endif // SRC_TINT_AST_ATTRIBUTE_H_ |