json.hpp

Go to the documentation of this file.

/*
  Copyright (c) 2013, Randolph Voorhies, Shane Grant
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
      * Neither the name of cereal nor the
        names of its contributors may be used to endorse or promote products
        derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CEREAL_ARCHIVES_JSON_HPP_
#define CEREAL_ARCHIVES_JSON_HPP_

#include <cereal/cereal.hpp>
#include <cereal/details/util.hpp>

#include <cereal/external/rapidjson/prettywriter.h>
#include <cereal/external/rapidjson/genericstream.h>
#include <cereal/external/base64.hpp>

#include <sstream>
#include <stack>
#include <vector>
#include <string>

#include <iostream>

namespace cereal
{
  // ######################################################################

  class JSONOutputArchive : public OutputArchive<JSONOutputArchive>
  {
    typedef rapidjson::GenericWriteStream WriteStream;
    typedef rapidjson::PrettyWriter<WriteStream> JSONWriter;

    public:

      JSONOutputArchive(std::ostream & stream) :
        OutputArchive<JSONOutputArchive>(this),
        itsWriteStream(stream),
        itsWriter(itsWriteStream)
      {
        itsNameCounter.push(0);
        itsWriter.StartObject();
      }

      ~JSONOutputArchive()
      {
        itsWriter.EndObject();
      }

      void saveValue(bool b)                { itsWriter.Bool(b);     }
      void saveValue(int i)                 { itsWriter.Int(i);      }
      void saveValue(unsigned u)            { itsWriter.Uint(u);     }
      void saveValue(int64_t i64)           { itsWriter.Int64(i64);  }
      void saveValue(uint64_t u64)          { itsWriter.Uint64(u64); }
      void saveValue(double d)              { itsWriter.Double(d);   }
      void saveValue(std::string const & s) { rawString(s);          }
      void saveValue(char const * s)        { itsWriter.String(s);   }
      void saveNull()                       { itsWriter.Null();      }

      void writeName()
      {
        if(itsNextName == nullptr)
        {
          std::string name = "value" + std::to_string( itsNameCounter.top()++ ) + "\0";
          saveValue(name);
        }
        else
        {
          saveValue(itsNextName);
          itsNextName = nullptr;
        }
      }

      void rawString(std::string const & s)
      {
        itsWriter.String(s.c_str(), s.size());
      }


      void startNode()
      {
        writeName();

        itsWriter.StartObject();

        itsNameCounter.push(0);
      }

      void finishNode()
      {
        itsWriter.EndObject();

        itsNameCounter.pop();
      }

      void setNextName( const char * name )
      {
        itsNextName = name;
      }


      void saveBinaryValue( const void * data, size_t size, const char * name = nullptr )
      {
      };

      void setOutputType(bool outputType)
      {
        itsOutputType = outputType;
      }

    protected:

    private:
      WriteStream itsWriteStream;          
      JSONWriter itsWriter;                
      std::ostringstream itsOS;            
      bool itsOutputType;                  
      char const * itsNextName;            
      std::stack<uint32_t> itsNameCounter; 
  }; // JSONOutputArchive



  // ######################################################################

  class JSONInputArchive
  {
  };

  // ######################################################################
  // JSONArchive prologue and epilogue functions


  template <class T>
  void prologue( JSONOutputArchive &, NameValuePair<T> const & )
  { }


  template <class T>
  void epilogue( JSONOutputArchive &, NameValuePair<T> const & )
  { }


  template <class T>
  void prologue( JSONOutputArchive &, SizeTag<T> const & )
  { }


  template <class T>
  void epilogue( JSONOutputArchive &, SizeTag<T> const & )
  { }


  template <class T>
    typename std::enable_if<!std::is_arithmetic<T>::value, void>::type
  prologue( JSONOutputArchive & ar, T const & data )
  {
    ar.startNode();
  }


  template <class T>
    typename std::enable_if<!std::is_arithmetic<T>::value, void>::type
  epilogue( JSONOutputArchive & ar, T const & data )
  {
    ar.finishNode();
  }

  template <class T>
    typename std::enable_if<std::is_arithmetic<T>::value, void>::type
  prologue( JSONOutputArchive & ar, T const & data )
  {
    ar.writeName();
  }

  template <class T>
    typename std::enable_if<std::is_arithmetic<T>::value, void>::type
  epilogue( JSONOutputArchive & ar, T const & data )
  {
  }

  template<class CharT, class Traits, class Alloc> inline
  void prologue(JSONOutputArchive & ar, std::basic_string<CharT, Traits, Alloc> const & str)
  {
    ar.writeName();
  }

  template<class CharT, class Traits, class Alloc> inline
  void epilogue(JSONOutputArchive & ar, std::basic_string<CharT, Traits, Alloc> const & str)
  {
  }

  // ######################################################################
  // Common JSONArchive serialization functions

  template <class Archive, class T> inline
  CEREAL_ARCHIVE_RESTRICT(JSONInputArchive, JSONOutputArchive)
  serialize( Archive & ar, NameValuePair<T> & t )
  {
    ar.setNextName( t.name );
    ar( t.value );
  }

  template <class Archive, class T> inline
  CEREAL_ARCHIVE_RESTRICT(JSONInputArchive, JSONOutputArchive)
  serialize( Archive & ar, SizeTag<T> & )
  { }

  template<class T> inline
  typename std::enable_if<std::is_arithmetic<T>::value, void>::type
  save(JSONOutputArchive & ar, T const & t)
  {
    ar.saveValue( t );
  }

  template<class CharT, class Traits, class Alloc> inline
  void save(JSONOutputArchive & ar, std::basic_string<CharT, Traits, Alloc> const & str)
  {
    ar.saveValue( str );
  }

} // namespace cereal

// register archives for polymorphic support
CEREAL_REGISTER_ARCHIVE(cereal::JSONOutputArchive);

#endif // CEREAL_ARCHIVES_JSON_HPP_