public void WriteRule(PosixTz.DstRule rule)
{
rule.Match(
fixedDateRule => {
sb.Append("J");
sb.Append(fixedDateRule.day);
},
dayOfYearRule => {
sb.Append(dayOfYearRule.day);
},
dayOfWeekRule => {
sb.Append("M");
sb.Append(dayOfWeekRule.month);
sb.Append(".");
sb.Append(dayOfWeekRule.week);
sb.Append(".");
sb.Append(dayOfWeekRule.day);
}
);
if (rule.time != PosixTz.DEFAULT_RULE_TIME)
{
sb.Append("/");
WriteTime(rule.time);
}
}
//Mm.n.d (the d'th day of week n of month m of the year)
public bool ReadDayOfWeekRule(ref PosixTz.DstRule rule)
{
int saved_pos = pos;
if (!ReadSpecChar('M'))
{
return(false);
}
SkipWhiteSpaces();
int month = 0;
if (!ReadNum(ref month) || month < 1 || month > 12)
{
RaiseParseError();
}
;
SkipWhiteSpaces();
if (!ReadSpecChar('.'))
{
//week is missing
RaiseParseError();
}
SkipWhiteSpaces();
int week = 0;
if (!ReadNum(ref week) || week < 1 || week > 5)
{
//1 <= n <= 5
RaiseParseError();
}
;
SkipWhiteSpaces();
if (!ReadSpecChar('.'))
{
//day is missing
RaiseParseError();
}
SkipWhiteSpaces();
int day = 0;
if (!ReadNum(ref day) || day > 6)
{
//0 <= d <= 6
RaiseParseError();
}
;
var time = ReadRuleTime();
rule = new PosixTz.DstRule.DayOfWeekRule(month, week, day, time);
return(true);
}
//n (the zero-based Julian day)
public bool ReadDayOfYearRule(ref PosixTz.DstRule rule)
{
int day = 0;
if (!ReadNum(ref day))
{
return(false);
}
if (day > 365)
{
//0 <= n <= 365
RaiseParseError();
}
;
var time = ReadRuleTime();
rule = new PosixTz.DstRule.DayOfYearRule(day, time);
return(true);
}
//Jn (the Julian day n)
public bool ReadFixedDateRule(ref PosixTz.DstRule rule)
{
int saved_pos = pos;
if (!ReadSpecChar('J'))
{
return(false);
}
SkipWhiteSpaces();
int day = 0;
if (!ReadNum(ref day) || day < 1 || day > 365)
{
//1 <= n <= 365
RaiseParseError();
}
;
var time = ReadRuleTime();
rule = new PosixTz.DstRule.FixedDateRule(day, time);
return(true);
}
public static TimeZoneInfo.TransitionTime ToSystemTransitionTime(this PosixTz.DstRule rule, int year)
{
return(rule.Match <TimeZoneInfo.TransitionTime>(
fixedDate => {
var date = fixedDate.GetDate();
return TimeZoneInfo.TransitionTime.CreateFixedDateRule(
fixedDate.time.ToSystemDateTime(),
date.month + 1, date.day + 1
);
},
dayOfYear => {
var date = dayOfYear.GetDate(year);
return TimeZoneInfo.TransitionTime.CreateFixedDateRule(
dayOfYear.time.ToSystemDateTime(),
date.month + 1, date.day + 1
);
},
dayOfWeek => TimeZoneInfo.TransitionTime.CreateFloatingDateRule(
dayOfWeek.time.ToSystemDateTime(),
dayOfWeek.month, dayOfWeek.week, (DayOfWeek)dayOfWeek.day
)
));
}
//std offset [dst[offset],start[/time],end[/time]]
public PosixTz ReadExpandedTimeZone()
{
SkipWhiteSpaces();
string std_name = null;
if (!ReadName(ref std_name) || std_name.Length < 3)
{
//std is required and should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int std_ofs = 0;
if (!ReadTimeOffset(ref std_ofs))
{
//The offset following std shall be required.
RaiseParseError();
}
SkipWhiteSpaces();
if (AtEnd())
{
//if dst is missing, then the alternative time does not apply in this locale.
return(new PosixTz(std_name, std_ofs, null));
}
//parse dst clause
string dst_name = null;
if (!ReadName(ref dst_name))
{
//dst clause should begin with dst name which should be no less than three characters
RaiseParseError();
}
SkipWhiteSpaces();
int dst_offset = 0;
if (!ReadTimeOffset(ref dst_offset))
{
//if no offset follows dst, the alternative time is assumed to be one hour ahead
//of standard time.
dst_offset = PosixTz.GetDefaultDstOffset(std_ofs);
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';'))
{
//no rules is specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule start = null;
if (!ReadRule(ref start))
{
//start rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
if (!ReadSpecChar(',', ';'))
{
//end rule is not specified
RaiseParseError();
}
SkipWhiteSpaces();
PosixTz.DstRule end = null;
if (!ReadRule(ref end))
{
//end rule is not specified
RaiseParseError();
}
var dst = new PosixTz.Dst(dst_name, dst_offset, start, end);
SkipWhiteSpaces();
if (!AtEnd())
{
//unexpected
RaiseParseError();
}
return(new PosixTz(std_name, std_ofs, dst));
}
public bool ReadRule(ref PosixTz.DstRule rule)
{
return(ReadFixedDateRule(ref rule) || ReadDayOfYearRule(ref rule) || ReadDayOfWeekRule(ref rule));
}