[System.Security.SecuritySafeCritical] // auto-generated
internal static bool TryParse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles, ref DateTimeResult result) {
if (s == null) {
result.SetFailure(ParseFailureKind.ArgumentNull, "ArgumentNull_String", null, "s");
return false;
}
if (s.Length == 0) {
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
return false;
}
Contract.Assert(dtfi != null, "dtfi == null");
#if _LOGGING
DTFITrace(dtfi);
#endif
DateTime time;
//
// First try the predefined format.
//
DS dps = DS.BEGIN; // Date Parsing State.
bool reachTerminalState = false;
DateTimeToken dtok = new DateTimeToken(); // The buffer to store the parsing token.
dtok.suffix = TokenType.SEP_Unk;
DateTimeRawInfo raw = new DateTimeRawInfo(); // The buffer to store temporary parsing information.
unsafe {
Int32 * numberPointer = stackalloc Int32[3];
raw.Init(numberPointer);
}
raw.hasSameDateAndTimeSeparators = dtfi.DateSeparator.Equals(dtfi.TimeSeparator, StringComparison.Ordinal);
result.calendar = dtfi.Calendar;
result.era = Calendar.CurrentEra;
//
// The string to be parsed. Use a __DTString wrapper so that we can trace the index which
// indicates the begining of next token.
//
__DTString str = new __DTString(s, dtfi);
str.GetNext();
//
// The following loop will break out when we reach the end of the str.
//
do {
//
// Call the lexer to get the next token.
//
// If we find a era in Lex(), the era value will be in raw.era.
if (!Lex(dps, ref str, ref dtok, ref raw, ref result, ref dtfi, styles))
{
TPTraceExit("0000", dps);
return false;
}
//
// If the token is not unknown, process it.
// Otherwise, just discard it.
//
if (dtok.dtt != DTT.Unk)
{
//
// Check if we got any CJK Date/Time suffix.
// Since the Date/Time suffix tells us the number belongs to year/month/day/hour/minute/second,
// store the number in the appropriate field in the result.
//
if (dtok.suffix != TokenType.SEP_Unk)
{
if (!ProcessDateTimeSuffix(ref result, ref raw, ref dtok)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
TPTraceExit("0010", dps);
return false;
}
dtok.suffix = TokenType.SEP_Unk; // Reset suffix to SEP_Unk;
}
if (dtok.dtt == DTT.NumLocalTimeMark) {
if (dps == DS.D_YNd || dps == DS.D_YN) {
// Consider this as ISO 8601 format:
// "yyyy-MM-dd'T'HH:mm:ss" 1999-10-31T02:00:00
TPTraceExit("0020", dps);
return (ParseISO8601(ref raw, ref str, styles, ref result));
}
else {
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
TPTraceExit("0030", dps);
return false;
}
}
if (raw.hasSameDateAndTimeSeparators)
{
if (dtok.dtt == DTT.YearEnd || dtok.dtt == DTT.YearSpace || dtok.dtt == DTT.YearDateSep)
{
// When time and date separators are same and we are hitting a year number while the first parsed part of the string was recognized
// as part of time (and not a date) DS.T_Nt, DS.T_NNt then change the state to be a date so we try to parse it as a date instead
if (dps == DS.T_Nt)
{
dps = DS.D_Nd;
}
if (dps == DS.T_NNt)
{
dps = DS.D_NNd;
}
}
bool atEnd = str.AtEnd();
if (dateParsingStates[(int)dps][(int)dtok.dtt] == DS.ERROR || atEnd)
{
switch (dtok.dtt)
{
// we have the case of Serbia have dates in forms 'd.M.yyyy.' so we can expect '.' after the date parts.
// changing the token to end with space instead of Date Separator will avoid failing the parsing.
case DTT.YearDateSep: dtok.dtt = atEnd ? DTT.YearEnd : DTT.YearSpace; break;
case DTT.NumDatesep: dtok.dtt = atEnd ? DTT.NumEnd : DTT.NumSpace; break;
case DTT.NumTimesep: dtok.dtt = atEnd ? DTT.NumEnd : DTT.NumSpace; break;
case DTT.MonthDatesep: dtok.dtt = atEnd ? DTT.MonthEnd : DTT.MonthSpace; break;
}
}
}
//
// Advance to the next state, and continue
//
dps = dateParsingStates[(int)dps][(int)dtok.dtt];
if (dps == DS.ERROR)
{
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
TPTraceExit("0040 (invalid state transition)", dps);
return false;
}
else if (dps > DS.ERROR)
{
if ((dtfi.FormatFlags & DateTimeFormatFlags.UseHebrewRule) != 0) {
if (!ProcessHebrewTerminalState(dps, ref result, ref styles, ref raw, dtfi)) {
TPTraceExit("0050 (ProcessHebrewTerminalState)", dps);
return false;
}
} else {
if (!ProcessTerminaltState(dps, ref result, ref styles, ref raw, dtfi)) {
TPTraceExit("0060 (ProcessTerminaltState)", dps);
return false;
}
}
reachTerminalState = true;
//
// If we have reached a terminal state, start over from DS.BEGIN again.
// For example, when we parsed "1999-12-23 13:30", we will reach a terminal state at "1999-12-23",
// and we start over so we can continue to parse "12:30".
//
dps = DS.BEGIN;
}
}
} while (dtok.dtt != DTT.End && dtok.dtt != DTT.NumEnd && dtok.dtt != DTT.MonthEnd);
if (!reachTerminalState) {
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
TPTraceExit("0070 (did not reach terminal state)", dps);
return false;
}
AdjustTimeMark(dtfi, ref raw);
if (!AdjustHour(ref result.Hour, raw.timeMark)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadDateTime", null);
TPTraceExit("0080 (AdjustHour)", dps);
return false;
}
// Check if the parased string only contains hour/minute/second values.
bool bTimeOnly = (result.Year == -1 && result.Month == -1 && result.Day == -1);
//
// Check if any year/month/day is missing in the parsing string.
// If yes, get the default value from today's date.
//
if (!CheckDefaultDateTime(ref result, ref result.calendar, styles)) {
TPTraceExit("0090 (failed to fill in missing year/month/day defaults)", dps);
return false;
}
if (!result.calendar.TryToDateTime(result.Year, result.Month, result.Day,
result.Hour, result.Minute, result.Second, 0, result.era, out time)) {
result.SetFailure(ParseFailureKind.FormatBadDateTimeCalendar, "Format_BadDateTimeCalendar", null);
TPTraceExit("0100 (result.calendar.TryToDateTime)", dps);
return false;
}
if (raw.fraction > 0) {
time = time.AddTicks((long)Math.Round(raw.fraction * Calendar.TicksPerSecond));
}
//
// We have to check day of week before we adjust to the time zone.
// Otherwise, the value of day of week may change after adjustting to the time zone.
//
if (raw.dayOfWeek != -1) {
//
// Check if day of week is correct.
//
if (raw.dayOfWeek != (int)result.calendar.GetDayOfWeek(time)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadDayOfWeek", null);
TPTraceExit("0110 (dayOfWeek check)", dps);
return false;
}
}
result.parsedDate = time;
if (!DetermineTimeZoneAdjustments(ref result, styles, bTimeOnly)) {
TPTraceExit("0120 (DetermineTimeZoneAdjustments)", dps);
return false;
}
TPTraceExit("0130 (success)", dps);
return true;
}
