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_