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  1. #ifndef DATE_TIME_DATE_FORMATTING_HPP___
  2. #define DATE_TIME_DATE_FORMATTING_HPP___
  3.  
  4. /* Copyright (c) 2002-2004 CrystalClear Software, Inc.
  5.  * Use, modification and distribution is subject to the
  6.  * Boost Software License, Version 1.0. (See accompanying
  7.  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  8.  * Author: Jeff Garland, Bart Garst
  9.  * $Date$
  10.  */
  11.  
  12. #include "boost/date_time/iso_format.hpp"
  13. #include "boost/date_time/compiler_config.hpp"
  14. #include <string>
  15. #include <sstream>
  16. #include <iomanip>
  17.  
  18. /* NOTE: "formatter" code for older compilers, ones that define
  19.  * BOOST_DATE_TIME_INCLUDE_LIMITED_HEADERS, is located in  
  20.  * date_formatting_limited.hpp
  21.  */
  22.  
  23. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost {
  24. namespace date_time {
  25.  
  26.   //! Formats a month as as string into an ostream
  27.   template<class month_type, class format_type, class charT=char>
  28.   class month_formatter
  29.   {
  30.     typedef std::basic_ostream<charT> ostream_type;
  31.   public:
  32.     //! Formats a month as as string into an ostream
  33.     /*! This function demands that month_type provide
  34.      *  functions for converting to short and long strings
  35.      *  if that capability is used.
  36.      */
  37.     static ostream_type& format_month(const month_type& month,
  38.                                       ostream_type &os)
  39.     {
  40.       switch (format_type::month_format())
  41.       {
  42.         case month_as_short_string:
  43.         {
  44.           os << month.as_short_string();
  45.           break;
  46.         }
  47.         case month_as_long_string:
  48.         {
  49.           os << month.as_long_string();
  50.           break;
  51.         }
  52.         case month_as_integer:
  53.         {
  54.           os << std::setw(2) << std::setfill(os.widen('0')) << month.as_number();
  55.           break;
  56.         }
  57.         default:
  58.           break;
  59.          
  60.       }
  61.       return os;
  62.     } // format_month
  63.   };
  64.  
  65.  
  66.   //! Convert ymd to a standard string formatting policies
  67.   template<class ymd_type, class format_type, class charT=char>
  68.   class ymd_formatter
  69.   {
  70.   public:
  71.     //! Convert ymd to a standard string formatting policies
  72.     /*! This is standard code for handling date formatting with
  73.      *  year-month-day based date information.  This function
  74.      *  uses the format_type to control whether the string will
  75.      *  contain separator characters, and if so what the character
  76.      *  will be.  In addtion, it can format the month as either
  77.      *  an integer or a string as controled by the formatting
  78.      *  policy
  79.      */
  80.     static std::basic_string<charT> ymd_to_string(ymd_type ymd)
  81.     {
  82.       typedef typename ymd_type::month_type month_type;
  83.       std::basic_ostringstream<charT> ss;
  84.  
  85.       // Temporarily switch to classic locale to prevent possible formatting
  86.       // of year with comma or other character (for example 2,008).
  87.       ss.imbue(std::locale::classic());
  88.       ss << ymd.year;
  89.       ss.imbue(std::locale());
  90.  
  91.       if (format_type::has_date_sep_chars()) {
  92.         ss << format_type::month_sep_char();
  93.       }
  94.       //this name is a bit ugly, oh well....
  95.       month_formatter<month_type,format_type,charT>::format_month(ymd.month, ss);
  96.       if (format_type::has_date_sep_chars()) {
  97.         ss << format_type::day_sep_char();
  98.       }
  99.       ss  << std::setw(2) << std::setfill(ss.widen('0'))
  100.           << ymd.day;
  101.       return ss.str();
  102.     }
  103.   };
  104.  
  105.  
  106.   //! Convert a date to string using format policies
  107.   template<class date_type, class format_type, class charT=char>
  108.   class date_formatter
  109.   {
  110.   public:
  111.     typedef std::basic_string<charT> string_type;
  112.     //! Convert to a date to standard string using format policies
  113.     static string_type date_to_string(date_type d)
  114.     {
  115.       typedef typename date_type::ymd_type ymd_type;
  116.       if (d.is_not_a_date()) {
  117.         return string_type(format_type::not_a_date());
  118.       }
  119.       if (d.is_neg_infinity()) {
  120.         return string_type(format_type::neg_infinity());
  121.       }
  122.       if (d.is_pos_infinity()) {
  123.         return string_type(format_type::pos_infinity());
  124.       }
  125.       ymd_type ymd = d.year_month_day();
  126.       return ymd_formatter<ymd_type, format_type, charT>::ymd_to_string(ymd);
  127.     }    
  128.   };
  129.  
  130.  
  131. } } //namespace date_time
  132.  
  133.  
  134. #endif
  135.  
  136.  
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