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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_AST_DECORATION_H_
#define SRC_AST_DECORATION_H_
#include <string>
#include <vector>
#include "src/ast/node.h"
namespace tint {
namespace ast {
/// The base class for all decorations
class Decoration : public Castable<Decoration, Node> {
public:
~Decoration() override;
/// @returns the WGSL name for the decoration
virtual std::string name() const = 0;
protected:
/// Constructor
/// @param program_id the identifier of the program that owns this node
/// @param source the source of this decoration
Decoration(ProgramID program_id, const Source& source)
: Base(program_id, source) {}
};
/// A list of decorations
using DecorationList = std::vector<Decoration*>;
/// @param decorations the list of decorations to search
/// @returns true if `decorations` includes a decoration of type `T`
template <typename T>
bool HasDecoration(const DecorationList& decorations) {
for (auto* deco : decorations) {
if (deco->Is<T>()) {
return true;
}
}
return false;
}
/// @param decorations the list of decorations to search
/// @returns a pointer to `T` from `decorations` if found, otherwise nullptr.
template <typename T>
T* GetDecoration(const DecorationList& decorations) {
for (auto* deco : decorations) {
if (deco->Is<T>()) {
return deco->As<T>();
}
}
return nullptr;
}
} // namespace ast
} // namespace tint
#endif // SRC_AST_DECORATION_H_