[857] | 1 | #ifndef _DATE_TIME_POSIX_TIME_ZONE__
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| 2 | #define _DATE_TIME_POSIX_TIME_ZONE__
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| 3 |
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| 4 | /* Copyright (c) 2003-2005 CrystalClear Software, Inc.
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| 5 | * Subject to the Boost Software License, Version 1.0. (See accompanying
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| 6 | * file LICENSE-1.0 or http://www.boost.org/LICENSE-1.0)
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| 7 | * Author: Jeff Garland, Bart Garst
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| 8 | * $Date: 2005/05/25 14:15:41 $
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| 9 | */
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| 10 |
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| 11 | #include <string>
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| 12 | #include <sstream>
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| 13 | #include "boost/date_time/gregorian/gregorian.hpp"
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| 14 | #include "boost/date_time/time_zone_names.hpp"
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| 15 | #include "boost/date_time/time_zone_base.hpp"
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| 16 | #include "boost/date_time/local_time/dst_transition_day_rules.hpp"
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| 17 | #include "boost/date_time/posix_time/posix_time.hpp"
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| 18 | #include "boost/tokenizer.hpp"
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| 19 | #include <stdexcept>
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| 20 |
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| 21 | namespace boost{
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| 22 | namespace local_time{
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| 23 |
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| 24 | //! simple exception for UTC and Daylight savings start/end offsets
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| 25 | struct bad_offset : public std::out_of_range
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| 26 | {
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| 27 | bad_offset(std::string _msg="") : std::out_of_range(std::string("Offset out of range: " + _msg)) {}
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| 28 | };
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| 29 | //! simple exception for UTC daylight savings adjustment
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| 30 | struct bad_adjustment : public std::out_of_range
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| 31 | {
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| 32 | bad_adjustment(std::string _msg="") : std::out_of_range(std::string("Adjustment out of range: " + _msg)) {}
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| 33 | };
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| 34 |
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| 35 | typedef boost::date_time::time_zone_names time_zone_names;
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| 36 | typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets;
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| 37 | typedef boost::date_time::time_zone_base<boost::posix_time::ptime> time_zone;
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| 38 |
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| 39 | //! A time zone class constructed from a POSIX time zone string
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| 40 | /*! A POSIX time zone string takes the form of:<br>
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| 41 | * "std offset dst [offset],start[/time],end[/time]" (w/no spaces)
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| 42 | * 'std' specifies the abbrev of the time zone.<br>
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| 43 | * 'offset' is the offset from UTC.<br>
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| 44 | * 'dst' specifies the abbrev of the time zone during daylight savings time.<br>
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| 45 | * The second offset is how many hours changed during DST. Default=1<br>
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| 46 | * 'start' and'end' are the dates when DST goes into (and out of) effect.<br>
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| 47 | * 'offset' takes the form of: [+|-]hh[:mm[:ss]] {h=0-23, m/s=0-59}<br>
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| 48 | * 'time' and 'offset' take the same form. Time defaults=02:00:00<br>
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| 49 | * 'start' and 'end' can be one of three forms:<br>
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| 50 | * Mm.w.d {month=1-12, week=1-5 (5 is always last), day=0-6}<br>
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| 51 | * Jn {n=1-365 Feb29 is never counted}<br>
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| 52 | * n {n=0-365 Feb29 is counted in leap years}<br>
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| 53 | * Example "PST-5PDT01:00:00,M4.1.0/02:00:00,M10.1.0/02:00:00"
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| 54 | * <br>
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| 55 | * Exceptions will be thrown under these conditions:<br>
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| 56 | * An invalid date spec (see date class)<br>
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| 57 | * A boost::local_time::bad_offset exception will be thrown for:<br>
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| 58 | * A DST start or end offset that is negative or more than 24 hours<br>
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| 59 | * A UTC zone that is greater than +12 or less than -12 hours<br>
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| 60 | * A boost::local_time::bad_adjustment exception will be thrown for:<br>
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| 61 | * A DST adjustment that is 24 hours or more (positive or negative)<br>
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| 62 | */
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| 63 | class posix_time_zone : public time_zone {
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| 64 | public:
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| 65 | typedef boost::posix_time::time_duration time_duration_type;
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| 66 | typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
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| 67 | typedef time_zone base_type;
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| 68 | typedef base_type::string_type string_type;
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| 69 | typedef base_type::stringstream_type stringstream_type;
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| 70 |
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| 71 | //! Construct from a POSIX time zone string
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| 72 | posix_time_zone(const std::string& s) :
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| 73 | zone_names_("std_name","std_abbrev","no-dst","no-dst"),
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| 74 | has_dst_(false),
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| 75 | base_utc_offset_(posix_time::hours(0)),
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| 76 | dst_offsets_(posix_time::hours(0),posix_time::hours(0),posix_time::hours(0)),
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| 77 | dst_calc_rules_()
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| 78 | {
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| 79 | boost::char_separator<char> sep(",");
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| 80 | tokenizer tokens(s, sep);
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| 81 | tokenizer::iterator it = tokens.begin();
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| 82 | calc_zone(*it++);
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| 83 | if(has_dst_){
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| 84 | std::string tmp_str = *it++;
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| 85 | calc_rules(tmp_str, *it);
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| 86 | }
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| 87 | }
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| 88 | virtual ~posix_time_zone() {};
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| 89 | //!String for the zone when not in daylight savings (eg: EST)
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| 90 | virtual std::string std_zone_abbrev()const
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| 91 | {
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| 92 | return zone_names_.std_zone_abbrev();
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| 93 | }
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| 94 | //!String for the timezone when in daylight savings (eg: EDT)
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| 95 | /*! For those time zones that have no DST, an empty string is used */
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| 96 | virtual std::string dst_zone_abbrev() const
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| 97 | {
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| 98 | return zone_names_.dst_zone_abbrev();
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| 99 | }
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| 100 | //!String for the zone when not in daylight savings (eg: Eastern Standard Time)
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| 101 | /*! The full STD name is not extracted from the posix time zone string.
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| 102 | * Therefore, the STD abbreviation is used in it's place */
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| 103 | virtual std::string std_zone_name()const
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| 104 | {
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| 105 | return zone_names_.std_zone_name();
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| 106 | }
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| 107 | //!String for the timezone when in daylight savings (eg: Eastern Daylight Time)
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| 108 | /*! The full DST name is not extracted from the posix time zone string.
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| 109 | * Therefore, the STD abbreviation is used in it's place. For time zones
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| 110 | * that have no DST, an empty string is used */
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| 111 | virtual std::string dst_zone_name()const
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| 112 | {
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| 113 | return zone_names_.dst_zone_name();
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| 114 | }
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| 115 | //! True if zone uses daylight savings adjustments otherwise false
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| 116 | virtual bool has_dst()const
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| 117 | {
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| 118 | return has_dst_;
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| 119 | }
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| 120 | //! Local time that DST starts -- NADT if has_dst is false
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| 121 | virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y)const
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| 122 | {
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| 123 | gregorian::date d(gregorian::not_a_date_time);
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| 124 | if(has_dst_)
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| 125 | {
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| 126 | d = dst_calc_rules_->start_day(y);
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| 127 | }
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| 128 | return posix_time::ptime(d, dst_offsets_.dst_start_offset_);
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| 129 | }
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| 130 | //! Local time that DST ends -- NADT if has_dst is false
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| 131 | virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y)const
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| 132 | {
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| 133 | gregorian::date d(gregorian::not_a_date_time);
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| 134 | if(has_dst_)
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| 135 | {
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| 136 | d = dst_calc_rules_->end_day(y);
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| 137 | }
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| 138 | return posix_time::ptime(d, dst_offsets_.dst_end_offset_);
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| 139 | }
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| 140 | //! Base offset from UTC for zone (eg: -07:30:00)
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| 141 | virtual time_duration_type base_utc_offset()const
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| 142 | {
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| 143 | return base_utc_offset_;
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| 144 | }
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| 145 | //! Adjustment forward or back made while DST is in effect
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| 146 | virtual time_duration_type dst_offset()const
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| 147 | {
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| 148 | return dst_offsets_.dst_adjust_;
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| 149 | }
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| 150 |
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| 151 | //! Returns a POSIX time_zone string for this object
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| 152 | virtual string_type to_posix_string() const
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| 153 | {
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| 154 | // std offset dst [offset],start[/time],end[/time] - w/o spaces
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| 155 | stringstream_type ss;
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| 156 | ss.fill('0');
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| 157 | boost::shared_ptr<dst_calc_rule> no_rules;
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| 158 | // std
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| 159 | ss << std_zone_abbrev();
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| 160 | // offset
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| 161 | if(base_utc_offset().is_negative()) {
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| 162 | // inverting the sign guarantees we get two digits
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| 163 | ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours();
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| 164 | }
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| 165 | else {
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| 166 | ss << '+' << std::setw(2) << base_utc_offset().hours();
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| 167 | }
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| 168 | if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) {
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| 169 | ss << ':' << std::setw(2) << base_utc_offset().minutes();
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| 170 | if(base_utc_offset().seconds() != 0) {
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| 171 | ss << ':' << std::setw(2) << base_utc_offset().seconds();
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| 172 | }
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| 173 | }
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| 174 | if(dst_calc_rules_ != no_rules) {
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| 175 | // dst
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| 176 | ss << dst_zone_abbrev();
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| 177 | // dst offset
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| 178 | if(dst_offset().is_negative()) {
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| 179 | // inverting the sign guarantees we get two digits
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| 180 | ss << '-' << std::setw(2) << dst_offset().invert_sign().hours();
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| 181 | }
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| 182 | else {
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| 183 | ss << '+' << std::setw(2) << dst_offset().hours();
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| 184 | }
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| 185 | if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) {
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| 186 | ss << ':' << std::setw(2) << dst_offset().minutes();
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| 187 | if(dst_offset().seconds() != 0) {
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| 188 | ss << ':' << std::setw(2) << dst_offset().seconds();
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| 189 | }
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| 190 | }
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| 191 | // start/time
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| 192 | ss << ',' << dst_calc_rules_->start_rule_as_string() << '/'
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| 193 | << std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':'
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| 194 | << std::setw(2) << dst_offsets_.dst_start_offset_.minutes();
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| 195 | if(dst_offsets_.dst_start_offset_.seconds() != 0) {
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| 196 | ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds();
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| 197 | }
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| 198 | // end/time
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| 199 | ss << ',' << dst_calc_rules_->end_rule_as_string() << '/'
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| 200 | << std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':'
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| 201 | << std::setw(2) << dst_offsets_.dst_end_offset_.minutes();
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| 202 | if(dst_offsets_.dst_end_offset_.seconds() != 0) {
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| 203 | ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds();
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| 204 | }
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| 205 | }
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| 206 |
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| 207 | return ss.str();
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| 208 | }
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| 209 | private:
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| 210 | time_zone_names zone_names_;
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| 211 | bool has_dst_;
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| 212 | time_duration_type base_utc_offset_;
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| 213 | dst_adjustment_offsets dst_offsets_;
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| 214 | boost::shared_ptr<dst_calc_rule> dst_calc_rules_;
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| 215 |
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| 216 | /*! Extract time zone abbreviations for STD & DST as well
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| 217 | * as the offsets for the time the shift occurs and how
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| 218 | * much of a shift. At this time full time zone names are
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| 219 | * NOT extracted so the abbreviations are used in their place */
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| 220 | void calc_zone(const std::string& obj){
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| 221 | std::stringstream ss("");
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| 222 | std::string::const_iterator sit = obj.begin();
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| 223 | std::string std_zone_abbrev("std_abbrev"), dst_zone_abbrev("");
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| 224 |
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| 225 | // get 'std' name/abbrev
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| 226 | while(std::isalpha(*sit)){
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| 227 | ss << *sit++;
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| 228 | }
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| 229 | std_zone_abbrev = ss.str();
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| 230 | ss.str("");
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| 231 |
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| 232 | // get UTC offset
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| 233 | if(sit != obj.end()){
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| 234 | // get duration
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| 235 | while(sit != obj.end() && !std::isalpha(*sit)){
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| 236 | ss << *sit++;
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| 237 | }
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| 238 | base_utc_offset_ = posix_time::duration_from_string(ss.str());
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| 239 | ss.str("");
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| 240 |
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| 241 | // base offset must be within range of -12 hours to +12 hours
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| 242 | if(base_utc_offset_ < time_duration_type(-12,0,0) ||
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| 243 | base_utc_offset_ > time_duration_type(12,0,0))
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| 244 | {
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| 245 | throw bad_offset(posix_time::to_simple_string(base_utc_offset_));
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| 246 | }
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| 247 | }
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| 248 |
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| 249 | // get DST data if given
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| 250 | if(sit != obj.end()){
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| 251 | has_dst_ = true;
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| 252 |
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| 253 | // get 'dst' name/abbrev
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| 254 | while(sit != obj.end() && std::isalpha(*sit)){
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| 255 | ss << *sit++;
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| 256 | }
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| 257 | dst_zone_abbrev = ss.str();
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| 258 | ss.str("");
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| 259 |
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| 260 | // get DST offset if given
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| 261 | if(sit != obj.end()){
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| 262 | // get duration
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| 263 | while(sit != obj.end() && !std::isalpha(*sit)){
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| 264 | ss << *sit++;
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| 265 | }
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| 266 | dst_offsets_.dst_adjust_ =
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| 267 | posix_time::duration_from_string(ss.str());
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| 268 | ss.str("");
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| 269 | }
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| 270 | else{ // default DST offset
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| 271 | dst_offsets_.dst_adjust_ = posix_time::hours(1);
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| 272 | }
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| 273 |
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| 274 | // adjustment must be within +|- 1 day
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| 275 | if(dst_offsets_.dst_adjust_ <= time_duration_type(-24,0,0) ||
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| 276 | dst_offsets_.dst_adjust_ >= time_duration_type(24,0,0))
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| 277 | {
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| 278 | throw bad_adjustment(posix_time::to_simple_string(dst_offsets_.dst_adjust_));
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| 279 | }
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| 280 | }
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| 281 | // full names not extracted so abbrevs used in their place
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| 282 | zone_names_ = time_zone_names(std_zone_abbrev, std_zone_abbrev, dst_zone_abbrev, dst_zone_abbrev);
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| 283 | }
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| 284 |
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| 285 | void calc_rules(const std::string& start, const std::string& end){
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| 286 | boost::char_separator<char> sep("/");
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| 287 | tokenizer st_tok(start, sep);
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| 288 | tokenizer et_tok(end, sep);
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| 289 | tokenizer::iterator sit = st_tok.begin();
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| 290 | tokenizer::iterator eit = et_tok.begin();
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| 291 |
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| 292 | // generate date spec
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| 293 | char x = std::string(*sit).at(0);
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| 294 | if(x == 'M'){
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| 295 | M_func(*sit, *eit);
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| 296 | }
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| 297 | else if(x == 'J'){
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| 298 | julian_no_leap(*sit, *eit);
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| 299 | }
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| 300 | else{
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| 301 | julian_day(*sit, *eit);
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| 302 | }
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| 303 |
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| 304 | ++sit;
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| 305 | ++eit;
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| 306 | // generate durations
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| 307 | // starting offset
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| 308 | if(sit != st_tok.end()){
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| 309 | dst_offsets_.dst_start_offset_ = posix_time::duration_from_string(*sit);
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| 310 | }
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| 311 | else{
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| 312 | // default
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| 313 | dst_offsets_.dst_start_offset_ = posix_time::hours(2);
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| 314 | }
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| 315 | // start/end offsets must fall on given date
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| 316 | if(dst_offsets_.dst_start_offset_ < time_duration_type(0,0,0) ||
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| 317 | dst_offsets_.dst_start_offset_ >= time_duration_type(24,0,0))
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| 318 | {
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| 319 | throw bad_offset(posix_time::to_simple_string(dst_offsets_.dst_start_offset_));
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| 320 | }
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| 321 |
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| 322 | // ending offset
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| 323 | if(eit != et_tok.end()){
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| 324 | dst_offsets_.dst_end_offset_ = posix_time::duration_from_string(*eit);
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| 325 | }
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| 326 | else{
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| 327 | // default
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| 328 | dst_offsets_.dst_end_offset_ = posix_time::hours(2);
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| 329 | }
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| 330 | // start/end offsets must fall on given date
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| 331 | if(dst_offsets_.dst_end_offset_ < time_duration_type(0,0,0) ||
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| 332 | dst_offsets_.dst_end_offset_ >= time_duration_type(24,0,0))
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| 333 | {
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| 334 | throw bad_offset(posix_time::to_simple_string(dst_offsets_.dst_end_offset_));
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| 335 | }
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| 336 | }
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| 337 |
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| 338 | /* Parses out a start/end date spec from a posix time zone string.
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| 339 | * Date specs come in three possible formats, this function handles
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| 340 | * the 'M' spec. Ex "M2.2.4" => 2nd month, 2nd week, 4th day .
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| 341 | */
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| 342 | void M_func(const std::string& s, const std::string& e){
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| 343 | typedef gregorian::nth_kday_of_month nkday;
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| 344 | unsigned short sm=0,sw=0,sd=0,em=0,ew=0,ed=0; // start/end month,week,day
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| 345 | char_separator<char> sep("M.");
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| 346 | tokenizer stok(s, sep), etok(e, sep);
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| 347 |
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| 348 | tokenizer::iterator it = stok.begin();
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| 349 | sm = lexical_cast<unsigned short>(*it++);
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| 350 | sw = lexical_cast<unsigned short>(*it++);
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| 351 | sd = lexical_cast<unsigned short>(*it);
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| 352 |
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| 353 | it = etok.begin();
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| 354 | em = lexical_cast<unsigned short>(*it++);
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| 355 | ew = lexical_cast<unsigned short>(*it++);
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| 356 | ed = lexical_cast<unsigned short>(*it);
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| 357 |
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| 358 | dst_calc_rules_ = shared_ptr<dst_calc_rule>(
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| 359 | new nth_kday_dst_rule(
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| 360 | nth_last_dst_rule::start_rule(
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| 361 | static_cast<nkday::week_num>(sw),sd,sm),
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| 362 | nth_last_dst_rule::start_rule(
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| 363 | static_cast<nkday::week_num>(ew),ed,em)
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| 364 | )
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| 365 | );
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| 366 | }
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| 367 |
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| 368 | //! Julian day. Feb29 is never counted, even in leap years
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| 369 | // expects range of 1-365
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| 370 | void julian_no_leap(const std::string& s, const std::string& e){
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| 371 | typedef gregorian::gregorian_calendar calendar;
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| 372 | const unsigned short year = 2001; // Non-leap year
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| 373 | unsigned short sm=1;
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| 374 | int sd=0;
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| 375 | sd = lexical_cast<int>(s.substr(1)); // skip 'J'
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| 376 | while(sd >= calendar::end_of_month_day(year,sm)){
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| 377 | sd -= calendar::end_of_month_day(year,sm++);
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| 378 | }
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| 379 | unsigned short em=1;
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| 380 | int ed=0;
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| 381 | ed = lexical_cast<int>(e.substr(1)); // skip 'J'
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| 382 | while(ed > calendar::end_of_month_day(year,em)){
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| 383 | ed -= calendar::end_of_month_day(year,em++);
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| 384 | }
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| 385 |
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| 386 | dst_calc_rules_ = shared_ptr<dst_calc_rule>(
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| 387 | new partial_date_dst_rule(
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| 388 | partial_date_dst_rule::start_rule(
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| 389 | sd, static_cast<date_time::months_of_year>(sm)),
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| 390 | partial_date_dst_rule::end_rule(
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| 391 | ed, static_cast<date_time::months_of_year>(em))
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| 392 | )
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| 393 | );
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| 394 | }
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| 395 |
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| 396 | //! Julian day. Feb29 is always counted, but exception thrown in non-leap years
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| 397 | // expects range of 0-365
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| 398 | void julian_day(const std::string& s, const std::string& e){
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| 399 | int sd=0, ed=0;
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| 400 | sd = lexical_cast<int>(s);
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| 401 | ed = lexical_cast<int>(e);
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| 402 | dst_calc_rules_ = shared_ptr<dst_calc_rule>(
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| 403 | new partial_date_dst_rule(
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| 404 | partial_date_dst_rule::start_rule(++sd),// args are 0-365
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| 405 | partial_date_dst_rule::end_rule(++ed) // pd expects 1-366
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| 406 | )
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| 407 | );
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| 408 | }
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| 409 |
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| 410 | //! helper function used when throwing exceptions
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| 411 | static std::string td_as_string(const time_duration_type& td)
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| 412 | {
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| 413 | std::string s;
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| 414 | #if defined(USE_DATE_TIME_PRE_1_33_FACET_IO)
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| 415 | s = posix_time::to_simple_string(td);
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| 416 | #else
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| 417 | std::stringstream ss;
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| 418 | ss << td;
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| 419 | s = ss.str();
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| 420 | #endif
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| 421 | return s;
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| 422 | }
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| 423 | };
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| 424 |
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| 425 | } } // namespace boost::local_time
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| 426 |
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| 427 |
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| 428 | #endif // _DATE_TIME_POSIX_TIME_ZONE__
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