Chris@16: #ifndef DATE_TIME_STRINGS_FROM_FACET__HPP___
Chris@16: #define DATE_TIME_STRINGS_FROM_FACET__HPP___
Chris@16: 
Chris@16: /* Copyright (c) 2004 CrystalClear Software, Inc.
Chris@16:  * Use, modification and distribution is subject to the
Chris@16:  * Boost Software License, Version 1.0. (See accompanying
Chris@16:  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  * Author: Jeff Garland
Chris@101:  * $Date$
Chris@16:  */
Chris@16: 
Chris@16: #include <sstream>
Chris@16: #include <string>
Chris@16: #include <vector>
Chris@16: #include <locale>
Chris@16: 
Chris@16: namespace boost { namespace date_time {
Chris@16: 
Chris@16: //! This function gathers up all the month strings from a std::locale
Chris@16: /*! Using the time_put facet, this function creates a collection of
Chris@16:  *  all the month strings from a locale.  This is handy when building
Chris@16:  *  custom date parsers or formatters that need to be localized.
Chris@16:  *
Chris@16:  *@param charT The type of char to use when gathering typically char
Chris@16:  *             or wchar_t.
Chris@16:  *@param locale The locale to use when gathering the strings
Chris@16:  *@param short_strings True(default) to gather short strings,
Chris@16:  *                     false for long strings.
Chris@16:  *@return A vector of strings containing the strings in order. eg:
Chris@16:  *        Jan, Feb, Mar, etc.
Chris@16:  */
Chris@16: template<typename charT>
Chris@16: std::vector<std::basic_string<charT> >
Chris@16: gather_month_strings(const std::locale& locale, bool short_strings=true)
Chris@16: {
Chris@16:   typedef std::basic_string<charT> string_type;
Chris@16:   typedef std::vector<string_type> collection_type;
Chris@16:   typedef std::ostreambuf_iterator<charT> ostream_iter_type;
Chris@16:   typedef std::basic_ostringstream<charT> stringstream_type;
Chris@16:   typedef std::time_put<charT>           time_put_facet_type;
Chris@16:   charT short_fmt[3] = { '%', 'b' };
Chris@16:   charT long_fmt[3]  = { '%', 'B' };
Chris@16:   collection_type months;
Chris@16:   string_type outfmt(short_fmt);
Chris@16:   if (!short_strings) {
Chris@16:     outfmt = long_fmt;
Chris@16:   }
Chris@16:   {
Chris@16:     //grab the needed strings by using the locale to
Chris@16:     //output each month
Chris@16:     const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
Chris@16:     tm tm_value;
Chris@16:     memset(&tm_value, 0, sizeof(tm_value));
Chris@16:     for (int m=0; m < 12; m++) {
Chris@16:       tm_value.tm_mon = m;
Chris@16:       stringstream_type ss;
Chris@16:       ostream_iter_type oitr(ss);
Chris@16:       std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
Chris@16:                                                       &tm_value,
Chris@16:                                                       p_outfmt,
Chris@16:                                                       p_outfmt_end);
Chris@16:       months.push_back(ss.str());
Chris@16:     }
Chris@16:   }
Chris@16:   return months;
Chris@16: }
Chris@16: 
Chris@16: //! This function gathers up all the weekday strings from a std::locale
Chris@16: /*! Using the time_put facet, this function creates a collection of
Chris@16:  *  all the weekday strings from a locale starting with the string for
Chris@16:  *  'Sunday'.  This is handy when building custom date parsers or
Chris@16:  *  formatters that need to be localized.
Chris@16:  *
Chris@16:  *@param charT The type of char to use when gathering typically char
Chris@16:  *             or wchar_t.
Chris@16:  *@param locale The locale to use when gathering the strings
Chris@16:  *@param short_strings True(default) to gather short strings,
Chris@16:  *                     false for long strings.
Chris@16:  *@return A vector of strings containing the weekdays in order. eg:
Chris@16:  *        Sun, Mon, Tue, Wed, Thu, Fri, Sat
Chris@16:  */
Chris@16: template<typename charT>
Chris@16: std::vector<std::basic_string<charT> >
Chris@16: gather_weekday_strings(const std::locale& locale, bool short_strings=true)
Chris@16: {
Chris@16:   typedef std::basic_string<charT> string_type;
Chris@16:   typedef std::vector<string_type> collection_type;
Chris@16:   typedef std::ostreambuf_iterator<charT> ostream_iter_type;
Chris@16:   typedef std::basic_ostringstream<charT> stringstream_type;
Chris@16:   typedef std::time_put<charT>           time_put_facet_type;
Chris@16:   charT short_fmt[3] = { '%', 'a' };
Chris@16:   charT long_fmt[3]  = { '%', 'A' };
Chris@16: 
Chris@16:   collection_type weekdays;
Chris@16: 
Chris@16: 
Chris@16:   string_type outfmt(short_fmt);
Chris@16:   if (!short_strings) {
Chris@16:     outfmt = long_fmt;
Chris@16:   }
Chris@16:   {
Chris@16:     //grab the needed strings by using the locale to
Chris@16:     //output each month / weekday
Chris@16:     const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
Chris@16:     tm tm_value;
Chris@16:     memset(&tm_value, 0, sizeof(tm_value));
Chris@16:     for (int i=0; i < 7; i++) {
Chris@16:       tm_value.tm_wday = i;
Chris@16:       stringstream_type ss;
Chris@16:       ostream_iter_type oitr(ss);
Chris@16:       std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
Chris@16:                                                       &tm_value,
Chris@16:                                                       p_outfmt,
Chris@16:                                                       p_outfmt_end);
Chris@16: 
Chris@16:       weekdays.push_back(ss.str());
Chris@16:     }
Chris@16:   }
Chris@16:   return weekdays;
Chris@16: }
Chris@16: 
Chris@16: } } //namespace
Chris@16: 
Chris@16: 
Chris@16: #endif