// Copyright 2014 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_CSS_PARSER_PARSER_H_
#define COBALT_CSS_PARSER_PARSER_H_

#include <memory>
#include <string>

#include "base/callback.h"
#include "cobalt/cssom/css_parser.h"

namespace cobalt {
namespace css_parser {

class Parser : public cssom::CSSParser {
 public:
  enum SupportsMapToMeshFlag {
    kSupportsMapToMesh,
    // Additionally supports map-to-mesh on rectangular video.
    kSupportsMapToMeshRectangular,
    kDoesNotSupportMapToMesh,
  };

  // The parameter |supports_map_to_mesh| can be used to toggle parser support
  // for the map-to-mesh CSS filter.  If disabled, "filter: map-to-mesh(...)"
  // will result in a parse error.
  static std::unique_ptr<Parser> Create(
      SupportsMapToMeshFlag supports_map_to_mesh = kSupportsMapToMesh);
  ~Parser();

  scoped_refptr<cssom::CSSStyleSheet> ParseStyleSheet(
      const std::string& input,
      const base::SourceLocation& input_location) override;

  scoped_refptr<cssom::CSSRule> ParseRule(
      const std::string& input,
      const base::SourceLocation& input_location) override;

  scoped_refptr<cssom::CSSDeclaredStyleData> ParseStyleDeclarationList(
      const std::string& input,
      const base::SourceLocation& input_location) override;

  scoped_refptr<cssom::CSSFontFaceDeclarationData> ParseFontFaceDeclarationList(
      const std::string& input,
      const base::SourceLocation& input_location) override;

  scoped_refptr<cssom::PropertyValue> ParsePropertyValue(
      const std::string& property_name, const std::string& property_value,
      const base::SourceLocation& property_location) override;

  void ParsePropertyIntoDeclarationData(
      const std::string& property_name, const std::string& property_value,
      const base::SourceLocation& property_location,
      cssom::CSSDeclarationData* declaration_data) override;

  scoped_refptr<cssom::MediaList> ParseMediaList(
      const std::string& media_list,
      const base::SourceLocation& input_location) override;

  scoped_refptr<cssom::MediaQuery> ParseMediaQuery(
      const std::string& media_query,
      const base::SourceLocation& input_location) override;

 private:
  typedef base::Callback<void(const std::string& message)> OnMessageCallback;

  enum MessageVerbosity {
    // With message verbosity set to kShort, expect to see a one line message
    // indicating the error/warning and that is it.  This is useful for testing.
    kShort,

    // With message verbosity set to kVerbose, expect to see information such
    // as the line that caused the error to be output, allong with an arrow
    // pointing to where the error occurred on the line.
    kVerbose,
  };

  Parser(const OnMessageCallback& on_warning_callback,
         const OnMessageCallback& on_error_callback,
         MessageVerbosity message_verbosity,
         SupportsMapToMeshFlag supports_map_to_mesh);

  const OnMessageCallback on_warning_callback_;
  const OnMessageCallback on_error_callback_;
  MessageVerbosity message_verbosity_;
  SupportsMapToMeshFlag supports_map_to_mesh_;

  friend class ParserImpl;
  friend class ParserTestBase;
  DISALLOW_COPY_AND_ASSIGN(Parser);
};

}  // namespace css_parser
}  // namespace cobalt

#endif  // COBALT_CSS_PARSER_PARSER_H_