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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 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 |