private static bool CheckForQuestionMarks(ref GenDateInfo gdi, ref string sDate)
{
if (sDate.StartsWith("?"))
{
while (sDate.StartsWith("?"))
sDate = sDate.Substring(1);
gdi.prec = GenDate.PrecisionType.Approximate;
if (sDate.Length == 0)
gdi.error = gdi.year == 0; // ok if we already have a year.
return true;
}
else
{
return false;
}
}
string ParseFormattedDate(string sDateString, string sFmt, out GenDateInfo gdi)
{
gdi = new GenDateInfo();
gdi.error = true; // just in case...
gdi.prec = GenDate.PrecisionType.Exact;
char ch;
int i;
int cch;
bool fError;
bool fDayPresent = false;
bool fMonthPresent = false;
bool fYearPresent = false;
string sDate = sDateString.Trim();
for (; sFmt.Length > 0; sFmt = sFmt.Substring(cch))
{
ch = sFmt[0];
for (i = 1; i < sFmt.Length; ++i)
{
if (sFmt[i] != ch)
break;
}
cch = i;
switch (ch)
{
case 'd':
if (CheckForQuestionMarks(ref gdi, ref sDate))
{
if (sDate.Length == 0)
return String.Empty;
else
break;
}
switch (cch)
{
case 1: // d
case 2: // dd
fDayPresent = true;
fError = !TryParseLeadingNumber(ref sDate, out gdi.mday);
if (fError || gdi.mday > 31)
return sDate;
break;
case 3: // ddd - Abbreviated day of week
fError = !TryMatchAgainstNameList(ref sDate, m_rgsDayAbbr, out gdi.wday);
if (fError)
return sDate;
break;
case 4: // dddd - Unabbreviated day of the week
fError = !TryMatchAgainstNameList(ref sDate, m_rgsDayName, out gdi.wday);
if (fError)
return sDate;
break;
default:
return sDate;
}
break;
case 'M':
if (CheckForQuestionMarks(ref gdi, ref sDate))
{
if (sDate.Length == 0)
return String.Empty;
else
break;
}
fMonthPresent = true;
switch (cch)
{
case 1: // M
case 2: // MM
fError = !TryParseLeadingNumber(ref sDate, out gdi.ymon);
if (fError || gdi.ymon > 12)
return sDate;
break;
case 3: // MMM - Abbreviated month name
fError = !TryMatchAgainstNameList(ref sDate, m_rgsMonthAbbr, out gdi.ymon);
if (fError)
return sDate;
break;
case 4: // MMMM - Unabbreviated month name
fError = !TryMatchAgainstNameList(ref sDate, m_rgsMonthName, out gdi.ymon);
if (fError)
return sDate;
break;
default:
return sDate;
}
break;
case 'y':
if (sDate.StartsWith("?"))
{
gdi.error = true;
return sDate;
}
fYearPresent = true;
int year;
int thisyear = DateTime.Now.Year;
switch (cch)
{
case 1:
fError = !TryParseLeadingNumber(ref sDate, out year);
if (fError || year > 9)
return sDate;
gdi.year = 2000 + year;
if (gdi.year > thisyear)
gdi.year -= 100;
break;
case 2:
fError = !TryParseLeadingNumber(ref sDate, out year);
if (fError || year > 99)
return sDate;
gdi.year = 2000 + year;
if (gdi.year > thisyear)
gdi.year -= 100;
break;
case 4:
fError = !TryParseLeadingNumber(ref sDate, out year);
if (fError)
return sDate;
break;
default:
return sDate;
}
break;
case 'g':
// TODO SteveMc: IMPLEMENT ME!
return sDate;
case '\'': // quoted text
//cch = ParseFmtQuotedText (sFmt, sDate);
//if (cch < 0)
// return 0; // text not found
break;
case ' ':
sDate = sDate.Trim();
break;
default:
// Check for matching separators.
sDate = sDate.Trim();
for (int j = 0; j < cch; ++j)
{
if (j >= sDate.Length || sDate[j] != ch)
return sDate;
}
sDate = sDate.Substring(cch);
sDate = sDate.Trim();
break;
}
}
gdi.error = !ValidateDate(fYearPresent ? gdi.year : 2000, fMonthPresent ? gdi.ymon : 1,
fDayPresent ? gdi.mday : 1);
return sDate;
}
