source: NonGTP/Boost/boost/date_time/date_formatting.hpp @ 857

Revision 857, 3.9 KB checked in by igarcia, 19 years ago (diff)
Line 
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 or http://www.boost.org/LICENSE-1.0)
8 * Author: Jeff Garland, Bart Garst
9 * $Date: 2004/08/29 19:31:11 $
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
23namespace boost {
24namespace 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  public:
31    //! Formats a month as as string into an ostream
32    /*! This function demands that month_type provide
33     *  functions for converting to short and long strings
34     *  if that capability is used.
35     */
36    static std::basic_ostream<charT>& format_month(const month_type& month,
37                                      std::basic_ostream<charT>& os)
38    {
39      switch (format_type::month_format())
40      {
41        case month_as_short_string:
42        {
43          os << month.as_short_string();
44          break;
45        }
46        case month_as_long_string:
47        {
48          os << month.as_long_string();
49          break;
50        }
51        case month_as_integer:
52        {
53          os << std::setw(2) << std::setfill(os.widen('0')) << month.as_number();
54          break;
55        }
56     
57      }
58      return os;
59    } // format_month
60  };
61
62
63  //! Convert ymd to a standard string formatting policies
64  template<class ymd_type, class format_type, class charT=char>
65  class ymd_formatter
66  {
67  public:
68    //! Convert ymd to a standard string formatting policies
69    /*! This is standard code for handling date formatting with
70     *  year-month-day based date information.  This function
71     *  uses the format_type to control whether the string will
72     *  contain separator characters, and if so what the character
73     *  will be.  In addtion, it can format the month as either
74     *  an integer or a string as controled by the formatting
75     *  policy
76     */
77    static std::basic_string<charT> ymd_to_string(ymd_type ymd)
78    {
79      typedef typename ymd_type::month_type month_type;
80      std::basic_ostringstream<charT> ss;
81      ss << ymd.year;
82      if (format_type::has_date_sep_chars()) {
83        ss << format_type::month_sep_char();
84      }
85      //this name is a bit ugly, oh well....
86      month_formatter<month_type,format_type,charT>::format_month(ymd.month, ss);
87      if (format_type::has_date_sep_chars()) {
88        ss << format_type::day_sep_char();
89      }
90      ss  << std::setw(2) << std::setfill(ss.widen('0'))
91          << ymd.day;
92      return ss.str();
93    }
94  };
95
96
97  //! Convert a date to string using format policies
98  template<class date_type, class format_type, class charT=char>
99  class date_formatter
100  {
101  public:
102    typedef std::basic_string<charT> string_type;
103    //! Convert to a date to standard string using format policies
104    static string_type date_to_string(date_type d)
105    {
106      typedef typename date_type::ymd_type ymd_type;
107      if (d.is_not_a_date()) {
108        return string_type(format_type::not_a_date());
109      }
110      if (d.is_neg_infinity()) {
111        return string_type(format_type::neg_infinity());
112      }
113      if (d.is_pos_infinity()) {
114        return string_type(format_type::pos_infinity());
115      }
116      ymd_type ymd = d.year_month_day();
117      return ymd_formatter<ymd_type, format_type, charT>::ymd_to_string(ymd);
118    }   
119  };
120
121
122} } //namespace date_time
123
124
125#endif
126
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