/*
 * 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_CSS_PARSER_POSITION_PARSE_STRUCTURES_H_
#define COBALT_CSS_PARSER_POSITION_PARSE_STRUCTURES_H_

#include "base/memory/scoped_ptr.h"
#include "cobalt/cssom/property_list_value.h"
#include "cobalt/cssom/property_value.h"

namespace cobalt {
namespace css_parser {

// This helps parsing and verifying syntax of background position and
// transform origin property values.
class PositionParseStructure {
 public:
  PositionParseStructure();

  bool PushBackElement(const scoped_refptr<cssom::PropertyValue>& element);

  // A special case that a combination of keyword and length or percentage
  // cannot be reordered.
  bool IsPositionValidOnSizeTwo();

  const cssom::PropertyListValue::Builder& position_builder() const {
    return position_builder_;
  }

 private:
  bool is_horizontal_specified_;
  bool is_vertical_specified_;
  bool previous_is_non_center_keyword_;
  int number_of_center_keyword_;

  cssom::PropertyListValue::Builder position_builder_;
};

}  // namespace css_parser
}  // namespace cobalt

#endif  // COBALT_CSS_PARSER_POSITION_PARSE_STRUCTURES_H_