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 | |
136 | |