476 lines
18 KiB
C++
476 lines
18 KiB
C++
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#ifndef _DATE_TIME_POSIX_TIME_ZONE__
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#define _DATE_TIME_POSIX_TIME_ZONE__
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/* Copyright (c) 2003-2005 CrystalClear Software, Inc.
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* Subject to the 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, Bart Garst
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* $Date$
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*/
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#include <string>
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#include <sstream>
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#include <stdexcept>
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#include <boost/tokenizer.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/date_time/compiler_config.hpp>
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#include <boost/date_time/gregorian/gregorian.hpp>
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#include <boost/date_time/time_zone_names.hpp>
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#include <boost/date_time/time_zone_base.hpp>
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#include <boost/date_time/local_time/dst_transition_day_rules.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include <boost/date_time/string_convert.hpp>
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#include <boost/date_time/time_parsing.hpp>
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namespace boost{
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namespace local_time{
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//! simple exception for UTC and Daylight savings start/end offsets
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struct BOOST_SYMBOL_VISIBLE bad_offset : public std::out_of_range
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{
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bad_offset(std::string const& msg = std::string()) :
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std::out_of_range(std::string("Offset out of range: " + msg)) {}
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};
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//! simple exception for UTC daylight savings adjustment
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struct BOOST_SYMBOL_VISIBLE bad_adjustment : public std::out_of_range
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{
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bad_adjustment(std::string const& msg = std::string()) :
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std::out_of_range(std::string("Adjustment out of range: " + msg)) {}
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};
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typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets;
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//! A time zone class constructed from a POSIX time zone string
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/*! A POSIX time zone string takes the form of:<br>
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* "std offset dst [offset],start[/time],end[/time]" (w/no spaces)
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* 'std' specifies the abbrev of the time zone.<br>
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* 'offset' is the offset from UTC.<br>
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* 'dst' specifies the abbrev of the time zone during daylight savings time.<br>
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* The second offset is how many hours changed during DST. Default=1<br>
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* 'start' and'end' are the dates when DST goes into (and out of) effect.<br>
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* 'offset' takes the form of: [+|-]hh[:mm[:ss]] {h=0-23, m/s=0-59}<br>
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* 'time' and 'offset' take the same form. Time defaults=02:00:00<br>
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* 'start' and 'end' can be one of three forms:<br>
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* Mm.w.d {month=1-12, week=1-5 (5 is always last), day=0-6}<br>
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* Jn {n=1-365 Feb29 is never counted}<br>
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* n {n=0-365 Feb29 is counted in leap years}<br>
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* Example "PST-5PDT01:00:00,M4.1.0/02:00:00,M10.1.0/02:00:00"
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* <br>
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* Exceptions will be thrown under these conditions:<br>
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* An invalid date spec (see date class)<br>
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* A boost::local_time::bad_offset exception will be thrown for:<br>
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* A DST start or end offset that is negative or more than 24 hours<br>
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* A UTC zone that is greater than +14 or less than -12 hours<br>
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* A boost::local_time::bad_adjustment exception will be thrown for:<br>
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* A DST adjustment that is 24 hours or more (positive or negative)<br>
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*
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* Note that UTC zone offsets can be greater than +12:
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* http://www.worldtimezone.com/utc/utc+1200.html
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*/
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template<class CharT>
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class BOOST_SYMBOL_VISIBLE posix_time_zone_base : public date_time::time_zone_base<posix_time::ptime,CharT> {
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public:
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typedef boost::posix_time::time_duration time_duration_type;
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typedef date_time::time_zone_names_base<CharT> time_zone_names;
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typedef date_time::time_zone_base<posix_time::ptime,CharT> base_type;
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typedef typename base_type::string_type string_type;
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typedef CharT char_type;
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typedef typename base_type::stringstream_type stringstream_type;
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typedef boost::char_separator<char_type, std::char_traits<char_type> > char_separator_type;
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typedef boost::tokenizer<char_separator_type,
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typename string_type::const_iterator,
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string_type> tokenizer_type;
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typedef typename tokenizer_type::iterator tokenizer_iterator_type;
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//! Construct from a POSIX time zone string
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posix_time_zone_base(const string_type& s) :
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//zone_names_("std_name","std_abbrev","no-dst","no-dst"),
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zone_names_(),
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has_dst_(false),
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base_utc_offset_(posix_time::hours(0)),
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dst_offsets_(posix_time::hours(0),posix_time::hours(0),posix_time::hours(0)),
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dst_calc_rules_()
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{
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#ifdef __HP_aCC
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// Work around bug in aC++ compiler: see QXCR1000880488 in the
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// HP bug tracking system
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const char_type sep_chars[2] = {',',0};
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#else
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const char_type sep_chars[2] = {','};
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#endif
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char_separator_type sep(sep_chars);
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tokenizer_type tokens(s, sep);
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tokenizer_iterator_type it = tokens.begin(), end = tokens.end();
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if (it == end)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Could not parse time zone name"));
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calc_zone(*it++);
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if(has_dst_)
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{
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if (it == end)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Could not parse DST begin time"));
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string_type dst_begin = *it++;
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if (it == end)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Could not parse DST end time"));
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string_type dst_end = *it;
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calc_rules(dst_begin, dst_end);
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}
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}
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virtual ~posix_time_zone_base() {}
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//!String for the zone when not in daylight savings (eg: EST)
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virtual string_type std_zone_abbrev()const
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{
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return zone_names_.std_zone_abbrev();
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}
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//!String for the timezone when in daylight savings (eg: EDT)
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/*! For those time zones that have no DST, an empty string is used */
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virtual string_type dst_zone_abbrev() const
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{
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return zone_names_.dst_zone_abbrev();
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}
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//!String for the zone when not in daylight savings (eg: Eastern Standard Time)
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/*! The full STD name is not extracted from the posix time zone string.
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* Therefore, the STD abbreviation is used in it's place */
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virtual string_type std_zone_name()const
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{
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return zone_names_.std_zone_name();
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}
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//!String for the timezone when in daylight savings (eg: Eastern Daylight Time)
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/*! The full DST name is not extracted from the posix time zone string.
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* Therefore, the STD abbreviation is used in it's place. For time zones
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* that have no DST, an empty string is used */
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virtual string_type dst_zone_name()const
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{
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return zone_names_.dst_zone_name();
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}
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//! True if zone uses daylight savings adjustments otherwise false
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virtual bool has_dst()const
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{
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return has_dst_;
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}
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//! Local time that DST starts -- NADT if has_dst is false
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virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y)const
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{
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gregorian::date d(gregorian::not_a_date_time);
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if(has_dst_)
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{
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d = dst_calc_rules_->start_day(y);
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}
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return posix_time::ptime(d, dst_offsets_.dst_start_offset_);
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}
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//! Local time that DST ends -- NADT if has_dst is false
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virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y)const
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{
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gregorian::date d(gregorian::not_a_date_time);
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if(has_dst_)
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{
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d = dst_calc_rules_->end_day(y);
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}
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return posix_time::ptime(d, dst_offsets_.dst_end_offset_);
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}
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//! Base offset from UTC for zone (eg: -07:30:00)
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virtual time_duration_type base_utc_offset()const
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{
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return base_utc_offset_;
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}
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//! Adjustment forward or back made while DST is in effect
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virtual time_duration_type dst_offset()const
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{
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return dst_offsets_.dst_adjust_;
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}
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//! Returns a POSIX time_zone string for this object
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virtual string_type to_posix_string() const
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{
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// std offset dst [offset],start[/time],end[/time] - w/o spaces
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stringstream_type ss;
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ss.fill('0');
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boost::shared_ptr<dst_calc_rule> no_rules;
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// std
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ss << std_zone_abbrev();
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// offset
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if(base_utc_offset().is_negative()) {
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// inverting the sign guarantees we get two digits
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ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours();
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}
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else {
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ss << '+' << std::setw(2) << base_utc_offset().hours();
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}
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if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << base_utc_offset().minutes();
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if(base_utc_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << base_utc_offset().seconds();
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}
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}
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if(dst_calc_rules_ != no_rules) {
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// dst
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ss << dst_zone_abbrev();
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// dst offset
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if(dst_offset().is_negative()) {
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// inverting the sign guarantees we get two digits
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ss << '-' << std::setw(2) << dst_offset().invert_sign().hours();
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}
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else {
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ss << '+' << std::setw(2) << dst_offset().hours();
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}
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if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offset().minutes();
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if(dst_offset().seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offset().seconds();
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}
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}
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// start/time
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ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->start_rule_as_string()) << '/'
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<< std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':'
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<< std::setw(2) << dst_offsets_.dst_start_offset_.minutes();
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if(dst_offsets_.dst_start_offset_.seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds();
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}
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// end/time
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ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->end_rule_as_string()) << '/'
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<< std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':'
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<< std::setw(2) << dst_offsets_.dst_end_offset_.minutes();
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if(dst_offsets_.dst_end_offset_.seconds() != 0) {
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ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds();
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}
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}
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return ss.str();
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}
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private:
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time_zone_names zone_names_;
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bool has_dst_;
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time_duration_type base_utc_offset_;
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dst_adjustment_offsets dst_offsets_;
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boost::shared_ptr<dst_calc_rule> dst_calc_rules_;
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/*! Extract time zone abbreviations for STD & DST as well
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* as the offsets for the time shift that occurs and how
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* much of a shift. At this time full time zone names are
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* NOT extracted so the abbreviations are used in their place */
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void calc_zone(const string_type& obj){
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const char_type empty_string[2] = {'\0'};
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stringstream_type ss(empty_string);
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typename string_type::const_pointer sit = obj.c_str(), obj_end = sit + obj.size();
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string_type l_std_zone_abbrev, l_dst_zone_abbrev;
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// get 'std' name/abbrev
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while(std::isalpha(*sit)){
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ss << *sit++;
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}
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l_std_zone_abbrev = ss.str();
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ss.str(empty_string);
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// get UTC offset
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if(sit != obj_end){
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// get duration
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while(sit != obj_end && !std::isalpha(*sit)){
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ss << *sit++;
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}
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base_utc_offset_ = date_time::str_from_delimited_time_duration<time_duration_type,char_type>(ss.str());
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ss.str(empty_string);
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// base offset must be within range of -12 hours to +14 hours
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if(base_utc_offset_ < time_duration_type(-12,0,0) ||
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base_utc_offset_ > time_duration_type(14,0,0))
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{
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boost::throw_exception(bad_offset(posix_time::to_simple_string(base_utc_offset_)));
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}
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}
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// get DST data if given
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if(sit != obj_end){
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has_dst_ = true;
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// get 'dst' name/abbrev
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while(sit != obj_end && std::isalpha(*sit)){
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ss << *sit++;
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}
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l_dst_zone_abbrev = ss.str();
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ss.str(empty_string);
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// get DST offset if given
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if(sit != obj_end){
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// get duration
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while(sit != obj_end && !std::isalpha(*sit)){
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ss << *sit++;
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}
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dst_offsets_.dst_adjust_ = date_time::str_from_delimited_time_duration<time_duration_type,char_type>(ss.str());
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ss.str(empty_string);
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}
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else{ // default DST offset
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dst_offsets_.dst_adjust_ = posix_time::hours(1);
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}
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// adjustment must be within +|- 1 day
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if(dst_offsets_.dst_adjust_ <= time_duration_type(-24,0,0) ||
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dst_offsets_.dst_adjust_ >= time_duration_type(24,0,0))
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{
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boost::throw_exception(bad_adjustment(posix_time::to_simple_string(dst_offsets_.dst_adjust_)));
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}
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}
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// full names not extracted so abbrevs used in their place
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zone_names_ = time_zone_names(l_std_zone_abbrev, l_std_zone_abbrev, l_dst_zone_abbrev, l_dst_zone_abbrev);
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}
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void calc_rules(const string_type& start, const string_type& end){
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#ifdef __HP_aCC
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// Work around bug in aC++ compiler: see QXCR1000880488 in the
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// HP bug tracking system
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const char_type sep_chars[2] = {'/',0};
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#else
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const char_type sep_chars[2] = {'/'};
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#endif
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char_separator_type sep(sep_chars);
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tokenizer_type st_tok(start, sep);
|
||
|
|
tokenizer_type et_tok(end, sep);
|
||
|
|
tokenizer_iterator_type sit = st_tok.begin();
|
||
|
|
tokenizer_iterator_type eit = et_tok.begin();
|
||
|
|
|
||
|
|
// generate date spec
|
||
|
|
char_type x = string_type(*sit).at(0);
|
||
|
|
if(x == 'M'){
|
||
|
|
M_func(*sit, *eit);
|
||
|
|
}
|
||
|
|
else if(x == 'J'){
|
||
|
|
julian_no_leap(*sit, *eit);
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
julian_day(*sit, *eit);
|
||
|
|
}
|
||
|
|
|
||
|
|
++sit;
|
||
|
|
++eit;
|
||
|
|
// generate durations
|
||
|
|
// starting offset
|
||
|
|
if(sit != st_tok.end()){
|
||
|
|
dst_offsets_.dst_start_offset_ = date_time::str_from_delimited_time_duration<time_duration_type,char_type>(*sit);
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
// default
|
||
|
|
dst_offsets_.dst_start_offset_ = posix_time::hours(2);
|
||
|
|
}
|
||
|
|
// start/end offsets must fall on given date
|
||
|
|
if(dst_offsets_.dst_start_offset_ < time_duration_type(0,0,0) ||
|
||
|
|
dst_offsets_.dst_start_offset_ >= time_duration_type(24,0,0))
|
||
|
|
{
|
||
|
|
boost::throw_exception(bad_offset(posix_time::to_simple_string(dst_offsets_.dst_start_offset_)));
|
||
|
|
}
|
||
|
|
|
||
|
|
// ending offset
|
||
|
|
if(eit != et_tok.end()){
|
||
|
|
dst_offsets_.dst_end_offset_ = date_time::str_from_delimited_time_duration<time_duration_type,char_type>(*eit);
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
// default
|
||
|
|
dst_offsets_.dst_end_offset_ = posix_time::hours(2);
|
||
|
|
}
|
||
|
|
// start/end offsets must fall on given date
|
||
|
|
if(dst_offsets_.dst_end_offset_ < time_duration_type(0,0,0) ||
|
||
|
|
dst_offsets_.dst_end_offset_ >= time_duration_type(24,0,0))
|
||
|
|
{
|
||
|
|
boost::throw_exception(bad_offset(posix_time::to_simple_string(dst_offsets_.dst_end_offset_)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Parses out a start/end date spec from a posix time zone string.
|
||
|
|
* Date specs come in three possible formats, this function handles
|
||
|
|
* the 'M' spec. Ex "M2.2.4" => 2nd month, 2nd week, 4th day .
|
||
|
|
*/
|
||
|
|
void M_func(const string_type& s, const string_type& e){
|
||
|
|
typedef gregorian::nth_kday_of_month nkday;
|
||
|
|
unsigned short sm=0,sw=0,sd=0,em=0,ew=0,ed=0; // start/end month,week,day
|
||
|
|
#ifdef __HP_aCC
|
||
|
|
// Work around bug in aC++ compiler: see QXCR1000880488 in the
|
||
|
|
// HP bug tracking system
|
||
|
|
const char_type sep_chars[3] = {'M','.',0};
|
||
|
|
#else
|
||
|
|
const char_type sep_chars[3] = {'M','.'};
|
||
|
|
#endif
|
||
|
|
char_separator_type sep(sep_chars);
|
||
|
|
tokenizer_type stok(s, sep), etok(e, sep);
|
||
|
|
|
||
|
|
tokenizer_iterator_type it = stok.begin();
|
||
|
|
sm = lexical_cast<unsigned short>(*it++);
|
||
|
|
sw = lexical_cast<unsigned short>(*it++);
|
||
|
|
sd = lexical_cast<unsigned short>(*it);
|
||
|
|
|
||
|
|
it = etok.begin();
|
||
|
|
em = lexical_cast<unsigned short>(*it++);
|
||
|
|
ew = lexical_cast<unsigned short>(*it++);
|
||
|
|
ed = lexical_cast<unsigned short>(*it);
|
||
|
|
|
||
|
|
dst_calc_rules_ = shared_ptr<dst_calc_rule>(
|
||
|
|
new nth_kday_dst_rule(
|
||
|
|
nth_last_dst_rule::start_rule(
|
||
|
|
static_cast<nkday::week_num>(sw),sd,sm),
|
||
|
|
nth_last_dst_rule::start_rule(
|
||
|
|
static_cast<nkday::week_num>(ew),ed,em)
|
||
|
|
)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! Julian day. Feb29 is never counted, even in leap years
|
||
|
|
// expects range of 1-365
|
||
|
|
void julian_no_leap(const string_type& s, const string_type& e){
|
||
|
|
typedef gregorian::gregorian_calendar calendar;
|
||
|
|
const unsigned short year = 2001; // Non-leap year
|
||
|
|
unsigned short sm=1;
|
||
|
|
int sd=0;
|
||
|
|
sd = lexical_cast<int>(s.substr(1)); // skip 'J'
|
||
|
|
while(sd >= calendar::end_of_month_day(year,sm)){
|
||
|
|
sd -= calendar::end_of_month_day(year,sm++);
|
||
|
|
}
|
||
|
|
unsigned short em=1;
|
||
|
|
int ed=0;
|
||
|
|
ed = lexical_cast<int>(e.substr(1)); // skip 'J'
|
||
|
|
while(ed > calendar::end_of_month_day(year,em)){
|
||
|
|
ed -= calendar::end_of_month_day(year,em++);
|
||
|
|
}
|
||
|
|
|
||
|
|
dst_calc_rules_ = shared_ptr<dst_calc_rule>(
|
||
|
|
new partial_date_dst_rule(
|
||
|
|
partial_date_dst_rule::start_rule(
|
||
|
|
static_cast<unsigned short>(sd), static_cast<date_time::months_of_year>(sm)),
|
||
|
|
partial_date_dst_rule::end_rule(
|
||
|
|
static_cast<unsigned short>(ed), static_cast<date_time::months_of_year>(em))
|
||
|
|
)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! Julian day. Feb29 is always counted, but exception thrown in non-leap years
|
||
|
|
// expects range of 0-365
|
||
|
|
void julian_day(const string_type& s, const string_type& e){
|
||
|
|
int sd=0, ed=0;
|
||
|
|
sd = lexical_cast<int>(s);
|
||
|
|
ed = lexical_cast<int>(e);
|
||
|
|
dst_calc_rules_ = shared_ptr<dst_calc_rule>(
|
||
|
|
new partial_date_dst_rule(
|
||
|
|
partial_date_dst_rule::start_rule(++sd),// args are 0-365
|
||
|
|
partial_date_dst_rule::end_rule(++ed) // pd expects 1-366
|
||
|
|
)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
//! helper function used when throwing exceptions
|
||
|
|
static std::string td_as_string(const time_duration_type& td)
|
||
|
|
{
|
||
|
|
std::string s;
|
||
|
|
#if defined(USE_DATE_TIME_PRE_1_33_FACET_IO)
|
||
|
|
s = posix_time::to_simple_string(td);
|
||
|
|
#else
|
||
|
|
std::stringstream ss;
|
||
|
|
ss << td;
|
||
|
|
s = ss.str();
|
||
|
|
#endif
|
||
|
|
return s;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef posix_time_zone_base<char> posix_time_zone;
|
||
|
|
|
||
|
|
} } // namespace boost::local_time
|
||
|
|
|
||
|
|
|
||
|
|
#endif // _DATE_TIME_POSIX_TIME_ZONE__
|