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/Src/Dependencies/Boost/boost/date_time/local_time/local_time_io.hpp

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C++ Header | 186 lines | 144 code | 19 blank | 23 comment | 16 complexity | b9b6ec9b69777c29f0bed64c4c476fd4 MD5 | raw file
  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: 2008-11-14 06:05:31 +1100 (Fri, 14 Nov 2008) $
  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
 21namespace boost {
 22namespace 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__