public string ParsePattern(MonthCalendarDate date, string[] nativeDigits = null)
{
// replace date separator with '/'
string format = this.pattern.Replace(provider.DateSeparator, "/");
StringBuilder sb = new StringBuilder();
Calendar c = provider.Calendar;
int i = 0;
int index = 0;
while (i < format.Length)
{
int tokLen;
char ch = format[i];
string currentString;
switch (ch)
{
case 'd':
{
tokLen = CountChar(format, i, ch);
if (tokLen <= 2)
{
currentString = DateMethods.GetNumberString(date.Day, nativeDigits, tokLen == 2);
this.isDayNumber = true;
this.dayString = currentString;
this.dayPartIndex = index++;
this.dayIndex = sb.Length;
}
else
{
currentString = tokLen == 3 ? provider.GetAbbreviatedDayName(c.GetDayOfWeek(date.Date)) : provider.GetDayName(c.GetDayOfWeek(date.Date));
this.dayNameString = currentString;
}
sb.Append(currentString);
break;
}
case 'M':
{
tokLen = CountChar(format, i, ch);
if (tokLen <= 2)
{
currentString = DateMethods.GetNumberString(date.Month, nativeDigits, tokLen == 2);
this.isMonthNumber = true;
}
else
{
currentString = tokLen == 3
? provider.GetAbbreviatedMonthName(date.Year, date.Month)
: provider.GetMonthName(date.Year, date.Month);
}
this.monthPartIndex = index++;
this.monthIndex = sb.Length;
this.monthString = currentString;
sb.Append(currentString);
break;
}
case 'y':
{
tokLen = CountChar(format, i, ch);
var year = tokLen <= 2 ? date.Year % 100 : date.Year;
currentString = DateMethods.GetNumberString(year, nativeDigits, tokLen <= 2);
this.yearString = currentString;
this.yearPartIndex = index++;
this.yearIndex = sb.Length;
sb.Append(currentString);
break;
}
case 'g':
{
tokLen = CountChar(format, i, ch);
currentString = provider.GetEraName(c.GetEra(date.Date));
this.eraString = currentString;
sb.Append(currentString);
break;
}
case '/':
{
tokLen = CountChar(format, i, ch);
sb.Append(provider.DateSeparator);
break;
}
default:
{
tokLen = 1;
sb.Append(ch.ToString(CultureInfo.CurrentUICulture));
break;
}
}
i += tokLen;
}
return(sb.ToString());
}
/// <summary>
/// Returns a string representation of this object.
/// </summary>
/// <param name="format">The format pattern.</param>
/// <param name="dtfi">The <see cref="DateTimeFormatInfo"/> to use for formatting.</param>
/// <param name="nameProvider">The day and month name provider.</param>
/// <param name="nativeDigits">If not <c>null</c> and valid, uses for number representation the specified native digits.</param>
/// <returns>
/// A <see cref="System.String"/> that represents this instance.
/// </returns>
private string ToString(string format, DateTimeFormatInfo dtfi, ICustomFormatProvider nameProvider, string[] nativeDigits = null)
{
if (dtfi == null)
{
dtfi = CultureInfo.CurrentUICulture.DateTimeFormat;
}
if (string.IsNullOrEmpty(format))
{
format = nameProvider != null ? nameProvider.ShortDatePattern : dtfi.ShortDatePattern;
}
else if (format.Length == 1)
{
switch (format[0])
{
case 'D':
{
format = nameProvider != null ? nameProvider.LongDatePattern : dtfi.LongDatePattern;
break;
}
case 'm':
case 'M':
{
format = nameProvider != null ? nameProvider.MonthDayPattern : dtfi.MonthDayPattern;
break;
}
case 'y':
case 'Y':
{
format = nameProvider != null ? nameProvider.YearMonthPattern : dtfi.YearMonthPattern;
break;
}
default:
{
format = nameProvider != null ? nameProvider.ShortDatePattern : dtfi.ShortDatePattern;
break;
}
}
}
format = format.Replace(nameProvider != null ? nameProvider.DateSeparator : dtfi.DateSeparator, "/");
StringBuilder sb = new StringBuilder();
Calendar c = nameProvider != null ? nameProvider.Calendar : dtfi.Calendar;
int i = 0;
while (i < format.Length)
{
int tokLen;
char ch = format[i];
switch (ch)
{
case 'd':
{
tokLen = CountChar(format, i, ch);
sb.Append(tokLen <= 2
? DateMethods.GetNumberString(this.Day, nativeDigits, tokLen == 2)
: GetDayName(c.GetDayOfWeek(this.Date), dtfi, nameProvider, tokLen == 3));
break;
}
case 'M':
{
tokLen = CountChar(format, i, ch);
sb.Append(tokLen <= 2
? DateMethods.GetNumberString(this.Month, nativeDigits, tokLen == 2)
: GetMonthName(this.Month, this.Year, dtfi, nameProvider, tokLen == 3));
break;
}
case 'y':
{
tokLen = CountChar(format, i, ch);
sb.Append(tokLen <= 2
? DateMethods.GetNumberString(this.Year % 100, nativeDigits, true)
: DateMethods.GetNumberString(this.Year, nativeDigits, false));
break;
}
case 'g':
{
tokLen = CountChar(format, i, ch);
sb.Append(nameProvider != null
? nameProvider.GetEraName(c.GetEra(this.Date))
: dtfi.GetEraName(c.GetEra(this.Date)));
break;
}
case '/':
{
tokLen = CountChar(format, i, ch);
sb.Append(nameProvider != null
? nameProvider.DateSeparator
: dtfi.DateSeparator);
break;
}
case '\'':
{
tokLen = 1;
break;
}
default:
{
tokLen = 1;
sb.Append(ch.ToString(CultureInfo.CurrentUICulture));
break;
}
}
i += tokLen;
}
return(sb.ToString());
}