cursorstreamwrapper.h

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// Tencent is pleased to support the open source community by making RapidJSON available.
//
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// 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 RAPIDJSON_CURSORSTREAMWRAPPER_H_
#define RAPIDJSON_CURSORSTREAMWRAPPER_H_

#include "stream.h"

#if defined(__GNUC__)
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(effc++)
#endif

#if defined(_MSC_VER) && _MSC_VER <= 1800
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(4702)  // unreachable code
RAPIDJSON_DIAG_OFF(4512)  // assignment operator could not be generated
#endif

RAPIDJSON_NAMESPACE_BEGIN


template <typename InputStream, typename Encoding = UTF8<> >
class CursorStreamWrapper : public GenericStreamWrapper<InputStream, Encoding>
{
public:
  typedef typename Encoding::Ch Ch;

  CursorStreamWrapper(InputStream& is) : GenericStreamWrapper<InputStream, Encoding>(is), line_(1), col_(0)
  {
  }

  // counting line and column number
  Ch Take()
  {
    Ch ch = this->is_.Take();
    if (ch == '\n')
    {
      line_++;
      col_ = 0;
    }
    else
    {
      col_++;
    }
    return ch;
  }

  size_t GetLine() const
  {
    return line_;
  }
  size_t GetColumn() const
  {
    return col_;
  }

private:
  size_t line_;  
  size_t col_;   
};

#if defined(_MSC_VER) && _MSC_VER <= 1800
RAPIDJSON_DIAG_POP
#endif

#if defined(__GNUC__)
RAPIDJSON_DIAG_POP
#endif

RAPIDJSON_NAMESPACE_END

#endif  // RAPIDJSON_CURSORSTREAMWRAPPER_H_