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// 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 {
namespace 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 src the source of this node
Attribute(ProgramID pid, const Source& src) : Base(pid, 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 T>
bool HasAttribute(const AttributeList& attributes) {
for (auto* attr : attributes) {
if (attr->Is<T>()) {
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 ast
} // namespace tint
#endif // SRC_TINT_AST_ATTRIBUTE_H_