// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// 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 COBALT_CSSOM_UNIVERSAL_SELECTOR_H_
#define COBALT_CSSOM_UNIVERSAL_SELECTOR_H_

#include <string>

#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "cobalt/base/tokens.h"
#include "cobalt/cssom/selector_tree.h"
#include "cobalt/cssom/simple_selector.h"
#include "cobalt/cssom/specificity.h"

namespace cobalt {
namespace cssom {

class SelectorVisitor;

// The universal selector represents the qualified name of any element type.
//   https://www.w3.org/TR/selectors4/#universal-selector
class UniversalSelector : public SimpleSelector {
 public:
  UniversalSelector()
      : SimpleSelector(kUniversalSelector, base::Token(), base::Token()) {}
  ~UniversalSelector() override {}

  // From Selector.
  void Accept(SelectorVisitor* visitor) override;
  Specificity GetSpecificity() const override { return Specificity(0, 0, 0); }

  // From SimpleSelector.
  UniversalSelector* AsUniversalSelector() override { return this; }
  void IndexSelectorTreeNode(SelectorTree::Node* parent_node,
                             SelectorTree::Node* child_node,
                             CombinatorType combinator) override;

 private:
  DISALLOW_COPY_AND_ASSIGN(UniversalSelector);
};

}  // namespace cssom
}  // namespace cobalt

#endif  // COBALT_CSSOM_UNIVERSAL_SELECTOR_H_