1 #ifndef DATE_TIME_STRINGS_FROM_FACET__HPP___
2 #define DATE_TIME_STRINGS_FROM_FACET__HPP___
3
4 /* Copyright (c) 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
9 * $Date$
10 */
11
12 #include <cstring>
13 #include <sstream>
14 #include <string>
15 #include <vector>
16 #include <locale>
17 #include <iterator>
18
19 namespace boost { namespace date_time {
20
21 //! This function gathers up all the month strings from a std::locale
22 /*! Using the time_put facet, this function creates a collection of
23 * all the month strings from a locale. This is handy when building
24 * custom date parsers or formatters that need to be localized.
25 *
26 *@param charT The type of char to use when gathering typically char
27 * or wchar_t.
28 *@param locale The locale to use when gathering the strings
29 *@param short_strings True(default) to gather short strings,
30 * false for long strings.
31 *@return A vector of strings containing the strings in order. eg:
32 * Jan, Feb, Mar, etc.
33 */
34 template<typename charT>
35 std::vector<std::basic_string<charT> >
gather_month_strings(const std::locale & locale,bool short_strings=true)36 gather_month_strings(const std::locale& locale, bool short_strings=true)
37 {
38 typedef std::basic_string<charT> string_type;
39 typedef std::vector<string_type> collection_type;
40 typedef std::ostreambuf_iterator<charT> ostream_iter_type;
41 typedef std::basic_ostringstream<charT> stringstream_type;
42 typedef std::time_put<charT> time_put_facet_type;
43 charT short_fmt[3] = { '%', 'b' };
44 charT long_fmt[3] = { '%', 'B' };
45 collection_type months;
46 string_type outfmt(short_fmt);
47 if (!short_strings) {
48 outfmt = long_fmt;
49 }
50 {
51 //grab the needed strings by using the locale to
52 //output each month
53 const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
54 tm tm_value;
55 std::memset(&tm_value, 0, sizeof(tm_value));
56 for (int m=0; m < 12; m++) {
57 tm_value.tm_mon = m;
58 stringstream_type ss;
59 ostream_iter_type oitr(ss);
60 std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
61 &tm_value,
62 p_outfmt,
63 p_outfmt_end);
64 months.push_back(ss.str());
65 }
66 }
67 return months;
68 }
69
70 //! This function gathers up all the weekday strings from a std::locale
71 /*! Using the time_put facet, this function creates a collection of
72 * all the weekday strings from a locale starting with the string for
73 * 'Sunday'. This is handy when building custom date parsers or
74 * formatters that need to be localized.
75 *
76 *@param charT The type of char to use when gathering typically char
77 * or wchar_t.
78 *@param locale The locale to use when gathering the strings
79 *@param short_strings True(default) to gather short strings,
80 * false for long strings.
81 *@return A vector of strings containing the weekdays in order. eg:
82 * Sun, Mon, Tue, Wed, Thu, Fri, Sat
83 */
84 template<typename charT>
85 std::vector<std::basic_string<charT> >
gather_weekday_strings(const std::locale & locale,bool short_strings=true)86 gather_weekday_strings(const std::locale& locale, bool short_strings=true)
87 {
88 typedef std::basic_string<charT> string_type;
89 typedef std::vector<string_type> collection_type;
90 typedef std::ostreambuf_iterator<charT> ostream_iter_type;
91 typedef std::basic_ostringstream<charT> stringstream_type;
92 typedef std::time_put<charT> time_put_facet_type;
93 charT short_fmt[3] = { '%', 'a' };
94 charT long_fmt[3] = { '%', 'A' };
95
96 collection_type weekdays;
97
98
99 string_type outfmt(short_fmt);
100 if (!short_strings) {
101 outfmt = long_fmt;
102 }
103 {
104 //grab the needed strings by using the locale to
105 //output each month / weekday
106 const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
107 tm tm_value;
108 std::memset(&tm_value, 0, sizeof(tm_value));
109 for (int i=0; i < 7; i++) {
110 tm_value.tm_wday = i;
111 stringstream_type ss;
112 ostream_iter_type oitr(ss);
113 std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
114 &tm_value,
115 p_outfmt,
116 p_outfmt_end);
117
118 weekdays.push_back(ss.str());
119 }
120 }
121 return weekdays;
122 }
123
124 } } //namespace
125
126
127 #endif
128