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