static bool TryGetMonth(DateToken token, byte[] text, out int month)
{
month = 0;
if (!token.IsMonth || token.Length < 3)
{
return(false);
}
var name = Encoding.ASCII.GetString(text, token.StartIndex, token.Length);
if (name.Length > 3)
{
name = name.Substring(0, 3);
}
for (int i = 0; i < Months.Length; i++)
{
if (Months[i].Equals(name, StringComparison.OrdinalIgnoreCase))
{
month = i + 1;
return(true);
}
}
return(false);
}
static bool TryGetWeekday(DateToken token, byte[] text, out DayOfWeek weekday)
{
weekday = DayOfWeek.Sunday;
if (!token.IsWeekday || token.Length < 3)
{
return(false);
}
var name = Encoding.ASCII.GetString(text, token.StartIndex, token.Length);
if (name.Length > 3)
{
name = name.Substring(0, 3);
}
for (int day = 0; day < WeekDays.Length; day++)
{
if (WeekDays[day].Equals(name, StringComparison.OrdinalIgnoreCase))
{
weekday = (DayOfWeek)day;
return(true);
}
}
return(false);
}
static bool TryGetTimeZone(DateToken token, byte[] text, out int tzone)
{
tzone = 0;
if (token.IsNumericZone)
{
int endIndex = token.StartIndex + token.Length;
int index = token.StartIndex;
int sign;
if (text[index] == (byte)'-')
{
sign = -1;
}
else if (text[index] == (byte)'+')
{
sign = 1;
}
else
{
return(false);
}
index++;
if (!TryParseInt32(text, ref index, endIndex, out tzone) || index != endIndex)
{
return(false);
}
tzone *= sign;
}
else if (token.IsAlphaZone)
{
if (token.Length > 3)
{
return(false);
}
var name = Encoding.ASCII.GetString(text, token.StartIndex, token.Length);
if (!timezones.TryGetValue(name, out tzone))
{
return(false);
}
}
else if (token.IsNumeric)
{
int endIndex = token.StartIndex + token.Length;
int index = token.StartIndex;
if (!ParseUtils.TryParseInt32(text, ref index, endIndex, out tzone) || index != endIndex)
{
return(false);
}
}
return(true);
}
static bool TryGetTimeOfDay(DateToken token, byte[] text, out int hour, out int minute, out int second)
{
int endIndex = token.StartIndex + token.Length;
int index = token.StartIndex;
hour = minute = second = 0;
if (!token.IsTimeOfDay)
{
return(false);
}
if (!TryParseInt32(text, ref index, endIndex, out hour) || hour > 23)
{
return(false);
}
if (index >= endIndex || text[index++] != (byte)':')
{
return(false);
}
if (!TryParseInt32(text, ref index, endIndex, out minute) || minute > 59)
{
return(false);
}
// Allow just hh:mm (i.e. w/o the :ss?)
if (index >= endIndex || text[index++] != (byte)':')
{
return(true);
}
if (!TryParseInt32(text, ref index, endIndex, out second) || second > 59)
{
return(false);
}
return(index == endIndex);
}
static bool TryGetYear(DateToken token, byte[] text, out int year)
{
int endIndex = token.StartIndex + token.Length;
int index = token.StartIndex;
year = 0;
if (!token.IsNumeric)
{
return(false);
}
if (!TryParseInt32(text, ref index, endIndex, out year))
{
return(false);
}
if (year < 100)
{
year += (year < 70) ? 2000 : 1900;
}
return(year >= 1969);
}
static bool TryGetDayOfMonth(DateToken token, byte[] text, out int day)
{
int endIndex = token.StartIndex + token.Length;
int index = token.StartIndex;
day = 0;
if (!token.IsNumeric)
{
return(false);
}
if (!TryParseInt32(text, ref index, endIndex, out day))
{
return(false);
}
if (day <= 0 || day > 31)
{
return(false);
}
return(true);
}
