SVOutStream.h

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//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2022.
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//    may be used to endorse or promote products derived from this software
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// $Maintainer: Hendrik Weisser $
// $Authors: Hendrik Weisser $
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#pragma once

#include <OpenMS/DATASTRUCTURES/String.h>

#include <ostream>
#include <fstream>      // std::ofstream
#include <sstream>
#include <boost/math/special_functions/fpclassify.hpp> // because isfinite not supported on Mac

namespace OpenMS
{
  enum Newline {nl};

  class OPENMS_DLLAPI SVOutStream :
    public std::ostream
  {
public:

    SVOutStream(const String& file_out,
                const String& sep = "\t",
                const String& replacement = "_",
                String::QuotingMethod quoting = String::DOUBLE);

    SVOutStream(std::ostream& out,
                const String& sep = "\t",
                const String& replacement = "_",
                String::QuotingMethod quoting = String::DOUBLE);

    ~SVOutStream() override;

    SVOutStream& operator<<(String str);    // use call-by-value here


    SVOutStream& operator<<(const std::string& str);


    SVOutStream& operator<<(const char* c_str);


    SVOutStream& operator<<(const char c);

    SVOutStream& operator<<(std::ostream& (*fp)(std::ostream&));

    SVOutStream& operator<<(enum Newline);

    template<typename T>
    typename std::enable_if<std::is_arithmetic<typename std::remove_reference<T>::type>::value, SVOutStream&>::type operator<<(const T& value)
    {
      if (!newline_) static_cast<std::ostream&>(*this) << sep_;
      else newline_ = false;
      static_cast<std::ostream&>(*this) << String(value);
      return *this;
    };

    template<typename T>
    typename std::enable_if<!std::is_arithmetic<typename std::remove_reference<T>::type>::value, SVOutStream&>::type operator<<(const T& value)
    {
      if (!newline_)
        static_cast<std::ostream &>(*this) << sep_;
      else
        newline_ = false;
      static_cast<std::ostream &>(*this) << value;
      return *this;
    };

    SVOutStream& write(const String& str);   // write unmodified string


    bool modifyStrings(bool modify);


    template <typename NumericT>
    SVOutStream& writeValueOrNan(NumericT thing)
    {
      if ((boost::math::isfinite)(thing)) return operator<<(thing);

      bool old = modifyStrings(false);
      if ((boost::math::isnan)(thing)) 
      {
        operator<<(nan_);
      }
      else if (thing < 0) 
      {
        operator<<("-" + inf_);
      }
      else 
      {
        operator<<(inf_);
      }
      modifyStrings(old);
      return *this;
    }

protected:
    std::ofstream* ofs_;

    String sep_;

    String replacement_;

    String nan_;

    String inf_;

    String::QuotingMethod quoting_;

    bool modify_strings_;

    bool newline_;

    std::stringstream ss_;
  };

}