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