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// Copyright 2015 Google Inc. 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_COMBINATOR_H_
#define COBALT_CSSOM_COMBINATOR_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
namespace cobalt {
namespace cssom {
class ChildCombinator;
class CombinatorVisitor;
class CompoundSelector;
class DescendantCombinator;
class FollowingSiblingCombinator;
class NextSiblingCombinator;
enum CombinatorType {
kChildCombinator,
kDescendantCombinator,
kNextSiblingCombinator,
kFollowingSiblingCombinator,
kCombinatorCount,
};
// A combinator is punctuation that represents a particular kind of relationship
// between the selectors on either side.
// https://www.w3.org/TR/selectors4/#combinator
class Combinator {
public:
Combinator();
virtual ~Combinator();
virtual void Accept(CombinatorVisitor* visitor) = 0;
virtual CombinatorType GetCombinatorType() = 0;
CompoundSelector* left_selector() { return left_selector_; }
void set_left_selector(CompoundSelector* left_selector) {
left_selector_ = left_selector;
}
CompoundSelector* right_selector() { return right_selector_.get(); }
void set_right_selector(scoped_ptr<CompoundSelector> right_selector);
private:
CompoundSelector* left_selector_;
scoped_ptr<CompoundSelector> right_selector_;
DISALLOW_COPY_AND_ASSIGN(Combinator);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_COMBINATOR_H_