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#ifndef DATE_TIME_STRINGS_FROM_FACET__HPP___
#define DATE_TIME_STRINGS_FROM_FACET__HPP___
/* Copyright (c) 2004 CrystalClear Software, Inc.
* Use, modification and distribution is subject to the
* Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
* Author: Jeff Garland
* $Date: 2012-09-22 09:04:10 -0700 (Sat, 22 Sep 2012) $
*/
#include <sstream>
#include <string>
#include <vector>
#include <locale>
namespace boost { namespace date_time {
//! This function gathers up all the month strings from a std::locale
/*! Using the time_put facet, this function creates a collection of
* all the month strings from a locale. This is handy when building
* custom date parsers or formatters that need to be localized.
*
*@param charT The type of char to use when gathering typically char
* or wchar_t.
*@param locale The locale to use when gathering the strings
*@param short_strings True(default) to gather short strings,
* false for long strings.
*@return A vector of strings containing the strings in order. eg:
* Jan, Feb, Mar, etc.
*/
template<typename charT>
std::vector<std::basic_string<charT> >
gather_month_strings(const std::locale& locale, bool short_strings=true)
{
typedef std::basic_string<charT> string_type;
typedef std::vector<string_type> collection_type;
typedef std::basic_ostringstream<charT> ostream_type;
typedef std::ostreambuf_iterator<charT> ostream_iter_type;
typedef std::basic_ostringstream<charT> stringstream_type;
typedef std::time_put<charT> time_put_facet_type;
charT short_fmt[3] = { '%', 'b' };
charT long_fmt[3] = { '%', 'B' };
collection_type months;
string_type outfmt(short_fmt);
if (!short_strings) {
outfmt = long_fmt;
}
{
//grab the needed strings by using the locale to
//output each month
const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
tm tm_value = {};
for (int m=0; m < 12; m++) {
tm_value.tm_mon = m;
stringstream_type ss;
ostream_iter_type oitr(ss);
std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
&tm_value,
p_outfmt,
p_outfmt_end);
months.push_back(ss.str());
}
}
return months;
}
//! This function gathers up all the weekday strings from a std::locale
/*! Using the time_put facet, this function creates a collection of
* all the weekday strings from a locale starting with the string for
* 'Sunday'. This is handy when building custom date parsers or
* formatters that need to be localized.
*
*@param charT The type of char to use when gathering typically char
* or wchar_t.
*@param locale The locale to use when gathering the strings
*@param short_strings True(default) to gather short strings,
* false for long strings.
*@return A vector of strings containing the weekdays in order. eg:
* Sun, Mon, Tue, Wed, Thu, Fri, Sat
*/
template<typename charT>
std::vector<std::basic_string<charT> >
gather_weekday_strings(const std::locale& locale, bool short_strings=true)
{
typedef std::basic_string<charT> string_type;
typedef std::vector<string_type> collection_type;
typedef std::basic_ostringstream<charT> ostream_type;
typedef std::ostreambuf_iterator<charT> ostream_iter_type;
typedef std::basic_ostringstream<charT> stringstream_type;
typedef std::time_put<charT> time_put_facet_type;
charT short_fmt[3] = { '%', 'a' };
charT long_fmt[3] = { '%', 'A' };
collection_type weekdays;
string_type outfmt(short_fmt);
if (!short_strings) {
outfmt = long_fmt;
}
{
//grab the needed strings by using the locale to
//output each month / weekday
const charT* p_outfmt = outfmt.c_str(), *p_outfmt_end = p_outfmt + outfmt.size();
tm tm_value = {};
for (int i=0; i < 7; i++) {
tm_value.tm_wday = i;
stringstream_type ss;
ostream_iter_type oitr(ss);
std::use_facet<time_put_facet_type>(locale).put(oitr, ss, ss.fill(),
&tm_value,
p_outfmt,
p_outfmt_end);
weekdays.push_back(ss.str());
}
}
return weekdays;
}
} } //namespace
#endif
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