time_facet.hpp

来自「support vector clustering for vc++」· HPP 代码 · 共 1,264 行 · 第 1/4 页

        if(a_time.zone_name(true).empty()) {
          /* TODO: this'll probably create problems if a user places 
           * the zone_*_format flag in the format with a ptime. This 
           * code removes the flag from the default formats */

          // if zone_name() returns an empty string, we want to
          // erase zone_iso_extended_format from format
          boost::algorithm::replace_all(format,
                                        zone_iso_extended_format,
                                        "");
        }
        else{
          boost::algorithm::replace_all(format,
                                        zone_iso_extended_format,
                                        a_time.zone_name(true));
        }
      }

      if (format.find(zone_iso_format) != string_type::npos) {
        if(a_time.zone_abbrev(true).empty()) {
          /* TODO: this'll probably create problems if a user places 
           * the zone_*_format flag in the format with a ptime. This 
           * code removes the flag from the default formats */

          // if zone_abbrev() returns an empty string, we want to
          // erase zone_iso_format from format
          boost::algorithm::replace_all(format,
                                        zone_iso_format,
                                        "");
        }
        else{
          boost::algorithm::replace_all(format,
                                        zone_iso_format,
                                        a_time.zone_abbrev(true));
        }
      }
      if (format.find(fractional_seconds_format) != string_type::npos) {
        // replace %f with nnnnnnn
        if (!frac_str.size()) {
          frac_str = fractional_seconds_as_string(a_time.time_of_day(), false);
        }
        boost::algorithm::replace_all(format,
                                      fractional_seconds_format, 
                                      frac_str);
      }

      if (format.find(fractional_seconds_or_none_format) != string_type::npos) {
        // replace %F with nnnnnnn or nothing if fs == 0
        frac_str = 
          fractional_seconds_as_string(a_time.time_of_day(), true);
        if (frac_str.size()) {
          char_type sep = std::use_facet<std::numpunct<char_type> >(a_ios.getloc()).decimal_point();
          string_type replace_string;
          replace_string += sep;
          replace_string += frac_str;
          boost::algorithm::replace_all(format,
                                        fractional_seconds_or_none_format, 
                                        replace_string);
        }
        else {
          boost::algorithm::erase_all(format,
                                      fractional_seconds_or_none_format);
        }
      }

      return this->do_put_tm(a_next, a_ios, a_fill, 
                       to_tm(a_time), format);
    }

    //! put function for time_duration
    OutItrT put(OutItrT a_next, 
                std::ios_base& a_ios, 
                char_type a_fill, 
                const time_duration_type& a_time_dur) const 
    {
      if (a_time_dur.is_special()) { 
        return this->do_put_special(a_next, a_ios, a_fill, 
                              a_time_dur.get_rep().as_special());
      }

      string_type format(m_time_duration_format);
      if (a_time_dur.is_negative()) {
          // replace %- with minus sign.  Should we use the numpunct facet?
          boost::algorithm::replace_all(format, 
                                        duration_sign_negative_only, 
                                        negative_sign);
          // remove all the %+ in the string with '-'
          boost::algorithm::replace_all(format, 
                                        duration_sign_always, 
                                        negative_sign);
      }
      else { //duration is positive
          // remove all the %- combos from the string
          boost::algorithm::replace_all(format, 
                                        duration_sign_negative_only, 
                                        "");
          // remove all the %+ in the string with '+'
          boost::algorithm::replace_all(format, 
                                        duration_sign_always, 
                                        positive_sign);
      }

      string_type frac_str;
      if (format.find(seconds_with_fractional_seconds_format) != string_type::npos) {
        // replace %s with %S.nnn 
        frac_str = 
          fractional_seconds_as_string(a_time_dur, false);
        char_type sep = std::use_facet<std::numpunct<char_type> >(a_ios.getloc()).decimal_point();
        
        string_type replace_string(seconds_format);
        replace_string += sep;
        replace_string += frac_str;
        boost::algorithm::replace_all(format, 
                                      seconds_with_fractional_seconds_format, 
                                      replace_string);
      }
      if (format.find(fractional_seconds_format) != string_type::npos) {
        // replace %f with nnnnnnn
        if (!frac_str.size()) {
          frac_str = fractional_seconds_as_string(a_time_dur, false);
        }
        boost::algorithm::replace_all(format,
                                      fractional_seconds_format, 
                                      frac_str);
      }

      if (format.find(fractional_seconds_or_none_format) != string_type::npos) {
        // replace %F with nnnnnnn or nothing if fs == 0
        frac_str = 
          fractional_seconds_as_string(a_time_dur, true);
        if (frac_str.size()) {
          char_type sep = std::use_facet<std::numpunct<char_type> >(a_ios.getloc()).decimal_point();
          string_type replace_string;
          replace_string += sep;
          replace_string += frac_str;
          boost::algorithm::replace_all(format,
                                        fractional_seconds_or_none_format, 
                                        replace_string);
        }
        else {
          boost::algorithm::erase_all(format,
                                      fractional_seconds_or_none_format);
        }
      }

      return this->do_put_tm(a_next, a_ios, a_fill, 
                       to_tm(a_time_dur), format);
    }
    
    OutItrT put(OutItrT next, std::ios_base& a_ios, 
                char_type fill, const period_type& p) const 
    {
      return this->m_period_formatter.put_period(next, a_ios, fill,p,*this);
    }


  protected:

    static 
    string_type 
    fractional_seconds_as_string(const time_duration_type& a_time,
                                 bool null_when_zero) 
    {
      typename time_duration_type::fractional_seconds_type frac_sec = 
        a_time.fractional_seconds();

      if (null_when_zero && (frac_sec == 0)) {
        return string_type();
      }

      //make sure there is no sign
      frac_sec = date_time::absolute_value(frac_sec);
      std::basic_ostringstream<char_type> ss;
      ss.imbue(std::locale::classic()); // don't want any formatting
      ss << std::setw(time_duration_type::num_fractional_digits())
         << std::setfill(static_cast<char_type>('0'));
#if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
      // JDG [7/6/02 VC++ compatibility]
      char_type buff[34];
      ss << _i64toa(static_cast<boost::int64_t>(frac_sec), buff, 10);
#else
      ss << frac_sec;
#endif
      return ss.str();
    }

  private:
    string_type m_time_duration_format;

  };
  
  template <class time_type, class CharT, class OutItrT>  
  std::locale::id time_facet<time_type, CharT, OutItrT>::id;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type* 
  time_facet<time_type, CharT, OutItrT>::fractional_seconds_format = time_formats<CharT>::fractional_seconds_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type* 
  time_facet<time_type, CharT, OutItrT>::fractional_seconds_or_none_format = time_formats<CharT>::fractional_seconds_or_none_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type* 
  time_facet<time_type, CharT, OutItrT>::seconds_with_fractional_seconds_format = 
    time_formats<CharT>::seconds_with_fractional_seconds_format;


  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::zone_name_format =  time_formats<CharT>::zone_name_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::zone_abbrev_format =  time_formats<CharT>::zone_abbrev_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::zone_iso_extended_format =time_formats<CharT>::zone_iso_extended_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::posix_zone_string_format =time_formats<CharT>::posix_zone_string_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::zone_iso_format =  time_formats<CharT>::zone_iso_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::seconds_format =  time_formats<CharT>::seconds_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::standard_format =  time_formats<CharT>::standard_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::duration_seperator =  time_formats<CharT>::duration_seperator;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::negative_sign =  time_formats<CharT>::negative_sign;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::positive_sign =  time_formats<CharT>::positive_sign;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::duration_sign_negative_only =  time_formats<CharT>::duration_sign_negative_only;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::duration_sign_always =  time_formats<CharT>::duration_sign_always;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type,CharT, OutItrT>::char_type*
  time_facet<time_type,CharT, OutItrT>::iso_time_format_specifier = time_formats<CharT>::iso_time_format_specifier;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::iso_time_format_extended_specifier = time_formats<CharT>::iso_time_format_extended_specifier;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type*
  time_facet<time_type, CharT, OutItrT>::default_time_format = 
    time_formats<CharT>::default_time_format;

  template <class time_type, class CharT, class OutItrT>  
  const typename time_facet<time_type, CharT, OutItrT>::char_type* 
  time_facet<time_type, CharT, OutItrT>::default_time_duration_format = 
    time_formats<CharT>::default_time_duration_format;


  //! Facet for format-based input.  
  /*!
   */
  template <class time_type,
            class CharT, 
            class InItrT = std::istreambuf_iterator<CharT, std::char_traits<CharT> > >
  class time_input_facet : 
    public boost::date_time::date_input_facet<typename time_type::date_type , CharT, InItrT> {
    public:
      typedef typename time_type::date_type date_type;
      typedef typename time_type::time_duration_type time_duration_type;
      typedef typename time_duration_type::fractional_seconds_type fracional_seconds_type;
      typedef boost::date_time::period<time_type,time_duration_type> period_type;
      typedef boost::date_time::date_input_facet<typename time_type::date_type, CharT, InItrT> base_type;
      typedef typename base_type::duration_type date_duration_type;
      typedef typename base_type::year_type year_type;
      typedef typename base_type::month_type month_type;
      typedef typename base_type::day_type day_type;
      typedef typename base_type::string_type string_type;
      typedef typename string_type::const_iterator const_itr;
      typedef typename base_type::char_type   char_type;
      typedef typename base_type::format_date_parser_type format_date_parser_type;
      typedef typename base_type::period_parser_type period_parser_type;
      typedef typename base_type::special_values_parser_type special_values_parser_type;
      typedef typename base_type::date_gen_parser_type date_gen_parser_type;
      typedef typename base_type::special_values_parser_type::match_results match_results;

      static const char_type* fractional_seconds_format;                // f
      static const char_type* fractional_seconds_or_none_format;        // F
      static const char_type* seconds_with_fractional_seconds_format;   // s
      static const char_type* seconds_format;                           // S
      static const char_type* standard_format;                          // x X
      static const char_type* zone_abbrev_format;                       // z
      static const char_type* zone_name_format;                         // Z
      static const char_type* zone_iso_format;                          // q
      static const char_type* zone_iso_extended_format;                 // Q
      static const char_type* duration_seperator;
      static const char_type* iso_time_format_specifier;
      static const char_type* iso_time_format_extended_specifier;
      static const char_type* default_time_input_format; 
      static const char_type* default_time_duration_format;