boost/date_time/local_time/local_time_io.hpp

   1 #ifndef BOOST_DATE_TIME_LOCAL_TIME_IO_HPP__
   2 #define BOOST_DATE_TIME_LOCAL_TIME_IO_HPP__
   3
   4 /* Copyright (c) 2003-2004 CrystalClear Software, Inc.
   5  * Subject to the Boost Software License, Version 1.0.
   6  * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   7  * Author: Jeff Garland, Bart Garst
   8  * $Date$
   9  */
  10
  11 #include <locale>
  12 #include <iostream>
  13 #include <iterator> // i/ostreambuf_iterator
  14 #include <boost/io/ios_state.hpp>
  15 #include <boost/date_time/time_facet.hpp>
  16 #include <boost/date_time/string_convert.hpp>
  17 #include <boost/date_time/local_time/local_date_time.hpp>
  18 #include <boost/date_time/local_time/posix_time_zone.hpp>
  19 #include <boost/date_time/local_time/conversion.hpp> // to_tm will be needed in the facets
  20
  21 namespace boost {
  22 namespace local_time {
  23
  24   typedef boost::date_time::time_facet<local_date_time, wchar_t> wlocal_time_facet;
  25   typedef boost::date_time::time_facet<local_date_time, char>     local_time_facet;
  26
  27   typedef boost::date_time::time_input_facet<local_date_time::utc_time_type,wchar_t> wlocal_time_input_facet;
  28   typedef boost::date_time::time_input_facet<local_date_time::utc_time_type,char>     local_time_input_facet;
  29
  30   //! operator<< for local_date_time - see local_time docs for formatting details
  31   template<class CharT, class TraitsT>
  32   inline
  33   std::basic_ostream<CharT, TraitsT>&
  34   operator<<(std::basic_ostream<CharT, TraitsT>& os, const local_date_time& ldt)
  35   {
  36     boost::io::ios_flags_saver iflags(os);
  37     typedef local_date_time time_type;//::utc_time_type typename
  38     typedef date_time::time_facet<time_type, CharT> custom_time_facet;
  39     typedef std::time_put<CharT> std_time_facet;
  40     std::ostreambuf_iterator<CharT> oitr(os);
  41
  42     if(std::has_facet<custom_time_facet>(os.getloc())) {
  43       std::use_facet<custom_time_facet>(os.getloc()).put(oitr,
  44                                                          os,
  45                                                          os.fill(),
  46                                                          ldt);
  47     }
  48     else {
  49       custom_time_facet* f = new custom_time_facet();
  50       std::locale l = std::locale(os.getloc(), f);
  51       os.imbue(l);
  52       f->put(oitr, os, os.fill(), ldt);
  53     }
  54
  55     return os;
  56   }
  57
  58
  59   //! input operator for local_date_time
  60   template <class CharT, class Traits>
  61   inline
  62   std::basic_istream<CharT, Traits>&
  63   operator>>(std::basic_istream<CharT, Traits>& is, local_date_time& ldt)
  64   {
  65     boost::io::ios_flags_saver iflags(is);
  66     typename std::basic_istream<CharT, Traits>::sentry strm_sentry(is, false);
  67     if (strm_sentry) {
  68       try {
  69         typedef typename local_date_time::utc_time_type utc_time_type;
  70         typedef typename date_time::time_input_facet<utc_time_type, CharT> time_input_facet;
  71
  72         // intermediate objects
  73         std::basic_string<CharT> tz_str;
  74         utc_time_type pt(not_a_date_time);
  75
  76         std::istreambuf_iterator<CharT,Traits> sit(is), str_end;
  77         if(std::has_facet<time_input_facet>(is.getloc())) {
  78           std::use_facet<time_input_facet>(is.getloc()).get_local_time(sit, str_end, is, pt, tz_str);
  79         }
  80         else {
  81           time_input_facet* f = new time_input_facet();
  82           std::locale l = std::locale(is.getloc(), f);
  83           is.imbue(l);
  84           f->get_local_time(sit, str_end, is, pt, tz_str);
  85         }
  86         if(tz_str.empty()) {
  87           time_zone_ptr null_ptr;
  88           // a null time_zone_ptr creates a local_date_time that is UTC
  89           ldt = local_date_time(pt, null_ptr);
  90         }
  91         else {
  92           time_zone_ptr tz_ptr(new posix_time_zone(date_time::convert_string_type<CharT,char>(tz_str)));
  93           // the "date & time" constructor expects the time label to *not* be utc.
  94           // a posix_tz_string also expects the time label to *not* be utc.
  95           ldt = local_date_time(pt.date(), pt.time_of_day(), tz_ptr, local_date_time::EXCEPTION_ON_ERROR);
  96         }
  97       }
  98       catch(...) {
  99         // mask tells us what exceptions are turned on
 100         std::ios_base::iostate exception_mask = is.exceptions();
 101         // if the user wants exceptions on failbit, we'll rethrow our
 102         // date_time exception & set the failbit
 103         if(std::ios_base::failbit & exception_mask) {
 104           try { is.setstate(std::ios_base::failbit); }
 105           catch(std::ios_base::failure&) {} // ignore this one
 106           throw; // rethrow original exception
 107         }
 108         else {
 109           // if the user want's to fail quietly, we simply set the failbit
 110           is.setstate(std::ios_base::failbit);
 111         }
 112
 113       }
 114     }
 115     return is;
 116   }
 117
 118   //! output operator for local_time_period
 119   template <class CharT, class TraitsT>
 120   inline
 121   std::basic_ostream<CharT, TraitsT>&
 122   operator<<(std::basic_ostream<CharT, TraitsT>& os,
 123              const boost::local_time::local_time_period& p) {
 124     boost::io::ios_flags_saver iflags(os);
 125     typedef boost::date_time::time_facet<local_date_time, CharT> custom_facet;
 126     typedef std::time_put<CharT> std_time_facet;
 127     std::ostreambuf_iterator<CharT> oitr(os);
 128     if (std::has_facet<custom_facet>(os.getloc())) {
 129       std::use_facet<custom_facet>(os.getloc()).put(oitr, os, os.fill(), p);
 130     }
 131     else {
 132       //instantiate a custom facet for dealing with periods since the user
 133       //has not put one in the stream so far.  This is for efficiency
 134       //since we would always need to reconstruct for every time period
 135       //if the local did not already exist.  Of course this will be overridden
 136       //if the user imbues as some later point.
 137       custom_facet* f = new custom_facet();
 138       std::locale l = std::locale(os.getloc(), f);
 139       os.imbue(l);
 140       f->put(oitr, os, os.fill(), p);
 141     }
 142     return os;
 143   }
 144
 145   //! input operator for local_time_period
 146   template <class CharT, class Traits>
 147   inline
 148   std::basic_istream<CharT, Traits>&
 149   operator>>(std::basic_istream<CharT, Traits>& is, boost::local_time::local_time_period& tp)
 150   {
 151     boost::io::ios_flags_saver iflags(is);
 152     typename std::basic_istream<CharT, Traits>::sentry strm_sentry(is, false);
 153     if (strm_sentry) {
 154       try {
 155         typedef typename date_time::time_input_facet<local_date_time, CharT> time_input_facet;
 156
 157         std::istreambuf_iterator<CharT,Traits> sit(is), str_end;
 158         if(std::has_facet<time_input_facet>(is.getloc())) {
 159           std::use_facet<time_input_facet>(is.getloc()).get(sit, str_end, is, tp);
 160         }
 161         else {
 162           time_input_facet* f = new time_input_facet();
 163           std::locale l = std::locale(is.getloc(), f);
 164           is.imbue(l);
 165           f->get(sit, str_end, is, tp);
 166         }
 167       }
 168       catch(...) {
 169         std::ios_base::iostate exception_mask = is.exceptions();
 170         if(std::ios_base::failbit & exception_mask) {
 171           try { is.setstate(std::ios_base::failbit); }
 172           catch(std::ios_base::failure&) {}
 173           throw; // rethrow original exception
 174         }
 175         else {
 176           is.setstate(std::ios_base::failbit);
 177         }
 178
 179       }
 180     }
 181     return is;
 182   }
 183
 184 } } // namespaces
 185
 186 #endif // BOOST_DATE_TIME_LOCAL_TIME_IO_HPP__